Pub Date : 2025-04-15DOI: 10.1016/j.envpol.2025.126256
Yingjian Yu , Yulong Li , Jingyue Bao , Zhuqi Chen , Longhua Wu , Lie Yang
The widespread presence of antibiotic residues in environmental matrices poses significant ecological risks. In this study, N-doped sludge biochar (NSBC) was synthesized through a straightforward and practical method using waste activated sludge and urea. The synthesized NSBC was employed to activate periodate (PI) for the efficient removal of sulfamethoxazole (SMX) from aqueous solutions. The incorporation of urea markedly enhanced the biochar's adsorption capacity and catalytic oxidation performance, achieving complete SMX removal within 60 min, while maintaining high removal efficiency across wide pH conditions (3–9). Interference experiments revealed that common anions (Cl−, SO42−, and NO3−) exerted minor inhibitory effects on SMX removal, while the presence of humic acid and the complex matrices of three natural water systems maintained SMX removal efficiencies above 70 %. Quenching experiments, electron paramagnetic resonance, and electrochemical analyses confirmed that the degradation of SMX primarily occurs via a non-radical pathway facilitated by an electron transfer mechanism. Analysis of degradation products and predictions from the ECOSAR model suggested that SMX was transformed into a series of smaller, low-toxicity intermediate products, significantly diminishing its inhibitory effect on seed germination. This study offers a sustainable strategy for waste sludge valorization and an eco-friendly solution for antibiotic pollution mitigation.
{"title":"Facile synthesis of urea-modified sewage sludge biochar for efficient sulfamethoxazole degradation via an electron transfer pathway","authors":"Yingjian Yu , Yulong Li , Jingyue Bao , Zhuqi Chen , Longhua Wu , Lie Yang","doi":"10.1016/j.envpol.2025.126256","DOIUrl":"10.1016/j.envpol.2025.126256","url":null,"abstract":"<div><div>The widespread presence of antibiotic residues in environmental matrices poses significant ecological risks. In this study, N-doped sludge biochar (NSBC) was synthesized through a straightforward and practical method using waste activated sludge and urea. The synthesized NSBC was employed to activate periodate (PI) for the efficient removal of sulfamethoxazole (SMX) from aqueous solutions. The incorporation of urea markedly enhanced the biochar's adsorption capacity and catalytic oxidation performance, achieving complete SMX removal within 60 min, while maintaining high removal efficiency across wide pH conditions (3–9). Interference experiments revealed that common anions (Cl<sup>−</sup>, SO<sub>4</sub><sup>2−</sup>, and NO<sub>3</sub><sup>−</sup>) exerted minor inhibitory effects on SMX removal, while the presence of humic acid and the complex matrices of three natural water systems maintained SMX removal efficiencies above 70 %. Quenching experiments, electron paramagnetic resonance, and electrochemical analyses confirmed that the degradation of SMX primarily occurs via a non-radical pathway facilitated by an electron transfer mechanism. Analysis of degradation products and predictions from the ECOSAR model suggested that SMX was transformed into a series of smaller, low-toxicity intermediate products, significantly diminishing its inhibitory effect on seed germination. This study offers a sustainable strategy for waste sludge valorization and an eco-friendly solution for antibiotic pollution mitigation.</div></div>","PeriodicalId":311,"journal":{"name":"Environmental Pollution","volume":"374 ","pages":"Article 126256"},"PeriodicalIF":7.6,"publicationDate":"2025-04-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143831712","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-04-15DOI: 10.1016/j.envpol.2025.126254
Sangwoo Eom , Anne L. Soerensen , Tae Siek Rhee , Jong Kuk Hong , Purena Son , Tae Keun Rho , Seunghee Han
High methylmercury (MeHg) concentrations in Arctic marine biota have been linked to high MeHg uptake driven by shallow MeHg peaks at water depths of 100–300 m in the Arctic Ocean. To understand how the biogeochemical characteristics of each basin affects the distribution of total Hg (THg) and MeHg across the Arctic Ocean, the spatial patterns of THg and MeHg were investigated using data from new transects in the Beaufort Sea (BS) and previously published Arctic Ocean expeditions covering the Canada Basin and Makarov Basin in the Pacific sector, and Amundsen Basin and Nansen Basin in the Atlantic sector. In the BS, the THg concentration in the polar mixed water increased with salinity (r = 0.87, p < 0.01), which was linked to THg transport from the Chukchi Shelf. Transport of Hg from the Chukchi Shelf also drove elevated THg concentrations in the polar mixed water and halocline water in the Canada Basin and Makarov Basin compared to other Arctic basins. The MeHg concentration in the BS was positively correlated with the biological index in the Pacific summer water (r = 0.86, p < 0.01), demonstrating that intrusion of warm and nutrient-rich Pacific water promotes MeHg production in the BS. In line with this result, chlorophyll-a showed a comparable cross-basin trend to that of MeHg, with the highest values in the Nansen Basin. In the halocline water, MeHg concentrations were highest in the Canada Basin likely due to the largest availability of Hg(II). On the contrary, MeHg concentration was highest in the Nansen Basin in the Atlantic water layer, which could be related to the higher seawater temperature and enhanced biological production. The results of this study underscore the critical role of Pacific and Atlantic inflows in modulating the profiles of THg and MeHg in the Arctic Ocean.
{"title":"Properties of inflowing Pacific and Atlantic water govern total and methylated mercury profiles in the Arctic Ocean","authors":"Sangwoo Eom , Anne L. Soerensen , Tae Siek Rhee , Jong Kuk Hong , Purena Son , Tae Keun Rho , Seunghee Han","doi":"10.1016/j.envpol.2025.126254","DOIUrl":"10.1016/j.envpol.2025.126254","url":null,"abstract":"<div><div>High methylmercury (MeHg) concentrations in Arctic marine biota have been linked to high MeHg uptake driven by shallow MeHg peaks at water depths of 100–300 m in the Arctic Ocean. To understand how the biogeochemical characteristics of each basin affects the distribution of total Hg (THg) and MeHg across the Arctic Ocean, the spatial patterns of THg and MeHg were investigated using data from new transects in the Beaufort Sea (BS) and previously published Arctic Ocean expeditions covering the Canada Basin and Makarov Basin in the Pacific sector, and Amundsen Basin and Nansen Basin in the Atlantic sector. In the BS, the THg concentration in the polar mixed water increased with salinity (r = 0.87, p < 0.01), which was linked to THg transport from the Chukchi Shelf. Transport of Hg from the Chukchi Shelf also drove elevated THg concentrations in the polar mixed water and halocline water in the Canada Basin and Makarov Basin compared to other Arctic basins. The MeHg concentration in the BS was positively correlated with the biological index in the Pacific summer water (r = 0.86, p < 0.01), demonstrating that intrusion of warm and nutrient-rich Pacific water promotes MeHg production in the BS. In line with this result, chlorophyll-a showed a comparable cross-basin trend to that of MeHg, with the highest values in the Nansen Basin. In the halocline water, MeHg concentrations were highest in the Canada Basin likely due to the largest availability of Hg(II). On the contrary, MeHg concentration was highest in the Nansen Basin in the Atlantic water layer, which could be related to the higher seawater temperature and enhanced biological production. The results of this study underscore the critical role of Pacific and Atlantic inflows in modulating the profiles of THg and MeHg in the Arctic Ocean.</div></div>","PeriodicalId":311,"journal":{"name":"Environmental Pollution","volume":"374 ","pages":"Article 126254"},"PeriodicalIF":7.6,"publicationDate":"2025-04-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143831766","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-04-15DOI: 10.1016/j.envpol.2025.126240
Noah Scovronick, Brooke Lappe, Melanie A. Pearson, Katy A. Smith, Stephanie M. Eick, Priya E. D’Souza, Parinya Panuwet, Minghao Kong, Volha Yakimavets, Rylee Stephenson, Dana Boyd Barr
Coastal Glynn County, Georgia, is home to four hazardous sites on the United States EPA’s National Priorities List. Toxicants of concern include mercury, the pesticide toxaphene, and Aroclor 1268, a mixture of highly chlorinated polychlorinated biphenyls (PCBs); these toxicants are known to persist in the local environment and/or regional aquatic life, including local seafood. At the invitation of, and in partnership with, local community leaders and environmental groups, we conducted a human exposure study in Glynn County. The average age of the study participants was 61 years, 66% were female, and 46% were Black. Mercury levels in study participants were comparable to the general US population. Levels of PCBs not strongly associated with Aroclor 1268 (PCBs 118, 138, 153 and 180) were lower in participants than the general population, but those associated with Aroclor 1268 were elevated; 19.3%, 25.0% and 39.7% of participants were above the estimated 95th percentile reference values for PCBs 196+203, 199, and 206, respectively. About 20% of participants were above the 95th percentile reference level for both toxaphene Parlars tested (Parlars 26 and 50). We also report on several other toxicants including other metals (lead, cadmium), p,p’-DDE, and poly- and per-fluorinated alkyl substances (PFAS). This study provides evidence that toxicants associated with local hazardous sites have contributed to exposures in Glynn County residents, and that some residents have exposures far exceeding what is common in the general population.
{"title":"Assessment of Human Exposure to Uncommon Industrial Toxicants in Glynn County, Georgia","authors":"Noah Scovronick, Brooke Lappe, Melanie A. Pearson, Katy A. Smith, Stephanie M. Eick, Priya E. D’Souza, Parinya Panuwet, Minghao Kong, Volha Yakimavets, Rylee Stephenson, Dana Boyd Barr","doi":"10.1016/j.envpol.2025.126240","DOIUrl":"https://doi.org/10.1016/j.envpol.2025.126240","url":null,"abstract":"Coastal Glynn County, Georgia, is home to four hazardous sites on the United States EPA’s National Priorities List. Toxicants of concern include mercury, the pesticide toxaphene, and Aroclor 1268, a mixture of highly chlorinated polychlorinated biphenyls (PCBs); these toxicants are known to persist in the local environment and/or regional aquatic life, including local seafood. At the invitation of, and in partnership with, local community leaders and environmental groups, we conducted a human exposure study in Glynn County. The average age of the study participants was 61 years, 66% were female, and 46% were Black. Mercury levels in study participants were comparable to the general US population. Levels of PCBs not strongly associated with Aroclor 1268 (PCBs 118, 138, 153 and 180) were lower in participants than the general population, but those associated with Aroclor 1268 were elevated; 19.3%, 25.0% and 39.7% of participants were above the estimated 95th percentile reference values for PCBs 196+203, 199, and 206, respectively. About 20% of participants were above the 95th percentile reference level for both toxaphene Parlars tested (Parlars 26 and 50). We also report on several other toxicants including other metals (lead, cadmium), p,p’-DDE, and poly- and per-fluorinated alkyl substances (PFAS). This study provides evidence that toxicants associated with local hazardous sites have contributed to exposures in Glynn County residents, and that some residents have exposures far exceeding what is common in the general population.","PeriodicalId":311,"journal":{"name":"Environmental Pollution","volume":"111 1","pages":""},"PeriodicalIF":8.9,"publicationDate":"2025-04-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143831765","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-04-15DOI: 10.1016/j.envpol.2025.126262
Yupan Zhang , Hao Wang , Yuichi Onda , Yiliu Tan , Hiroaki Kato
Following the Fukushima Daiichi nuclear power plant accident, approximately 1.8 PBq of Cesium-137 (137Cs) got deposited in forested areas—2600 km2 received more than 100 kBq/m2 of 137Cs. In Fukushima's predominantly cedar plantation forests, 60–90 % of the 137Cs deposition was intercepted by the forest canopy. Previous studies have confirmed the gradual migration of cesium from tree canopies to the forest floor. However, these investigations have typically focused on plot-level trends, overlooking variations within the canopy itself. Our study aims to address this gap by employing terrestrial Light Detection and Ranging (LiDAR) scan to elucidate the relationship between 137Cs activity/flux in throughfall and canopy characteristics post-accident. By defining a conical effective impact zone above each sampler and employing voxelization, we developed a robust and quantifiable method for assessing the impact of canopy volume on 137Cs flux. We identified two distinct patterns: high penetration with low 137Cs activity, and low penetration with high 137Cs activity. Analyzing various rainfall events revealed that prolonged light rain often resulted in higher concentrations. Point cloud volume analysis within a 5° range conical zone above rain gauges indicated that larger canopy volumes correlated with reduced throughfall, leading to higher 137Cs activity (R2 = 0.308–0.578). Conversely, larger canopy volumes also increased 137Cs flux (R2 = 0.1879–0.7496). Hydrogen and oxygen stable isotope composition suggested significant canopy evaporation during extended periods of light rainfall, resulting in concentrated and elevated 137Cs levels. This precise canopy quantification aids in understanding 137Cs source allocation and exposure in forest ecosystems, providing a basis for radiation dose quantification and health risk assessment.
{"title":"LiDAR-derived canopy structure explains 137Cs concentrations in throughfall in Fukushima plantation forest","authors":"Yupan Zhang , Hao Wang , Yuichi Onda , Yiliu Tan , Hiroaki Kato","doi":"10.1016/j.envpol.2025.126262","DOIUrl":"10.1016/j.envpol.2025.126262","url":null,"abstract":"<div><div>Following the Fukushima Daiichi nuclear power plant accident, approximately 1.8 PBq of Cesium-137 (<sup>137</sup>Cs) got deposited in forested areas—2600 km<sup>2</sup> received more than 100 kBq/m<sup>2</sup> of <sup>137</sup>Cs. In Fukushima's predominantly cedar plantation forests, 60–90 % of the <sup>137</sup>Cs deposition was intercepted by the forest canopy. Previous studies have confirmed the gradual migration of cesium from tree canopies to the forest floor. However, these investigations have typically focused on plot-level trends, overlooking variations within the canopy itself. Our study aims to address this gap by employing terrestrial Light Detection and Ranging (LiDAR) scan to elucidate the relationship between <sup>137</sup>Cs activity/flux in throughfall and canopy characteristics post-accident. By defining a conical effective impact zone above each sampler and employing voxelization, we developed a robust and quantifiable method for assessing the impact of canopy volume on <sup>137</sup>Cs flux. We identified two distinct patterns: high penetration with low <sup>137</sup>Cs activity, and low penetration with high <sup>137</sup>Cs activity. Analyzing various rainfall events revealed that prolonged light rain often resulted in higher concentrations. Point cloud volume analysis within a 5° range conical zone above rain gauges indicated that larger canopy volumes correlated with reduced throughfall, leading to higher <sup>137</sup>Cs activity (R<sup>2</sup> = 0.308–0.578). Conversely, larger canopy volumes also increased <sup>137</sup>Cs flux (R<sup>2</sup> = 0.1879–0.7496). Hydrogen and oxygen stable isotope composition suggested significant canopy evaporation during extended periods of light rainfall, resulting in concentrated and elevated <sup>137</sup>Cs levels. This precise canopy quantification aids in understanding <sup>137</sup>Cs source allocation and exposure in forest ecosystems, providing a basis for radiation dose quantification and health risk assessment.</div></div>","PeriodicalId":311,"journal":{"name":"Environmental Pollution","volume":"374 ","pages":"Article 126262"},"PeriodicalIF":7.6,"publicationDate":"2025-04-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143837587","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Bisphenol A (BPA) poses longstanding environmental concerns due to its widespread presence and recognized toxicity; however, its multigenerational ecotoxicity, in aquatic models such as water fleas, remains incompletely understood. This study examined the impact of sublethal BPA exposure on Daphnia magna across six generations, tracking changes in both life-history and population traits. Over the first five generations, BPA exposure produced minor and inconsistent effects on age at first oogenesis, age at first offspring production, growth rate, and fertility. The sixth generation exhibited prolonged oogenesis, delayed first offspring production, reduced body size, and decreased fertility, indicating delayed adverse effects. These multigenerational effects did not significantly alter population size or dynamics. Furthermore, BPA exposure did not affect feeding behavior in D. magna over six days, suggesting that food consumption-mediated mechanisms were unlikely a contributing factor. Our findings reveal BPA’s delayed adverse effects on D. magna fitness, underscoring potential vulnerabilities for D. magna and other species under additional environmental stressors. These results support literature indicating that endocrine-disrupting chemicals can cause delayed and cumulative adverse effects on zooplankton descendants. Broadening multigenerational research to include a wider range of species, alongside sub-organismal analyses, is crucial to advancing regulatory frameworks and understanding underlying mechanisms.
{"title":"Multigenerational testing reveals delayed chronic toxicity of bisphenol A to Daphnia magna: A common characteristic of endocrine-disrupting chemicals?","authors":"Tan-Duc Nguyen, Trong-Nhan Huynh, Van-Tai Nguyen, Khuong V. Dinh, Claudia Wiegand, Thanh Luu Pham, Manh-Ha Bui, Tomoaki Itayama, Ngoc Tuan Tran, Zhen Wang, Thanh-Son Dao","doi":"10.1016/j.envpol.2025.126253","DOIUrl":"https://doi.org/10.1016/j.envpol.2025.126253","url":null,"abstract":"Bisphenol A (BPA) poses longstanding environmental concerns due to its widespread presence and recognized toxicity; however, its multigenerational ecotoxicity, in aquatic models such as water fleas, remains incompletely understood. This study examined the impact of sublethal BPA exposure on <em>Daphnia magna</em> across six generations, tracking changes in both life-history and population traits. Over the first five generations, BPA exposure produced minor and inconsistent effects on age at first oogenesis, age at first offspring production, growth rate, and fertility. The sixth generation exhibited prolonged oogenesis, delayed first offspring production, reduced body size, and decreased fertility, indicating delayed adverse effects. These multigenerational effects did not significantly alter population size or dynamics. Furthermore, BPA exposure did not affect feeding behavior in <em>D. magna</em> over six days, suggesting that food consumption-mediated mechanisms were unlikely a contributing factor. Our findings reveal BPA’s delayed adverse effects on <em>D. magna</em> fitness, underscoring potential vulnerabilities for <em>D. magna</em> and other species under additional environmental stressors. These results support literature indicating that endocrine-disrupting chemicals can cause delayed and cumulative adverse effects on zooplankton descendants. Broadening multigenerational research to include a wider range of species, alongside sub-organismal analyses, is crucial to advancing regulatory frameworks and understanding underlying mechanisms.","PeriodicalId":311,"journal":{"name":"Environmental Pollution","volume":"119 1","pages":""},"PeriodicalIF":8.9,"publicationDate":"2025-04-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143831709","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-04-15DOI: 10.1016/j.envpol.2025.126261
Jesús Morón-López , Arnoldo Font-Nájera , Mikolaj Kokociński , Paweł Jarosiewicz , Tomasz Jurczak , Joanna Mankiewicz-Boczek
Cyanobacterial harmful algae blooms (cyanoHABs) pose significant ecological and public health concerns in freshwater ecosystems worldwide. Understanding the dynamics of phytoplankton communities and the efficacy of mitigation strategies is crucial for managing bloom events. This study investigates the impact of bioaugmentation with algicidal bacteria on Microcystis-dominated blooms through laboratory microcosm experiments. Field-collected samples from MID- and POST-summer bloom stages were treated with Morganella morganii, Exiguobacterium acetylicum, and a bacterial consortium including Bacillus pumilus. Phytoplankton composition, microcystin concentrations and genes related to microbial community dynamics (16S, mcyA, nosZ and amoA) were assessed by microscopy, HPLC and qPCR, respectively. Results showed that M. morganii significantly altered the phytoplankton community structure and promoted diatom proliferation in MID-summer microcosms, though treatments were less effective in POST-summer microcosms representing more mature bloom periods. Additionally, algicidal bacteria influenced microcystin levels, with M. morganii and E. acetylicum reducing toxigenic Microcystis genotypes, as indicated by lower mcyA gene copy numbers. Molecular analyses also revealed that algicidal bacterial treatments contributed to shifts in microbial functional genes, including increased denitrification activity linked to nosZ gene abundance. These findings highlight the intricate interplay between algicidal bacteria and microbial communities, where algicidal activity extends beyond direct cyanobacteria suppression to broader ecosystem-level effects. By rebalancing phytoplankton communities toward eukaryotic dominance and reducing toxigenic cyanobacterial genotypes during intense bloom episodes, bioaugmentation with algicidal bacteria emerges as a promising strategy for bloom management and ecosystem restoration.
{"title":"Influence of bloom stage on the effectiveness of algicidal bacteria in controlling harmful cyanobacteria: A microcosm study","authors":"Jesús Morón-López , Arnoldo Font-Nájera , Mikolaj Kokociński , Paweł Jarosiewicz , Tomasz Jurczak , Joanna Mankiewicz-Boczek","doi":"10.1016/j.envpol.2025.126261","DOIUrl":"10.1016/j.envpol.2025.126261","url":null,"abstract":"<div><div>Cyanobacterial harmful algae blooms (cyanoHABs) pose significant ecological and public health concerns in freshwater ecosystems worldwide. Understanding the dynamics of phytoplankton communities and the efficacy of mitigation strategies is crucial for managing bloom events. This study investigates the impact of bioaugmentation with algicidal bacteria on <em>Microcystis</em>-dominated blooms through laboratory microcosm experiments. Field-collected samples from MID- and POST-summer bloom stages were treated with <em>Morganella morganii</em>, <em>Exiguobacterium acetylicum</em>, and a bacterial consortium including <em>Bacillus pumilus</em>. Phytoplankton composition, microcystin concentrations and genes related to microbial community dynamics (16S, <em>mcy</em>A, <em>nos</em>Z and <em>amo</em>A) were assessed by microscopy, HPLC and qPCR, respectively. Results showed that <em>M. morganii</em> significantly altered the phytoplankton community structure and promoted diatom proliferation in MID-summer microcosms, though treatments were less effective in POST-summer microcosms representing more mature bloom periods. Additionally, algicidal bacteria influenced microcystin levels, with <em>M. morganii</em> and <em>E. acetylicum</em> reducing toxigenic <em>Microcystis</em> genotypes, as indicated by lower <em>mcy</em>A gene copy numbers. Molecular analyses also revealed that algicidal bacterial treatments contributed to shifts in microbial functional genes, including increased denitrification activity linked to <em>nos</em>Z gene abundance. These findings highlight the intricate interplay between algicidal bacteria and microbial communities, where algicidal activity extends beyond direct cyanobacteria suppression to broader ecosystem-level effects. By rebalancing phytoplankton communities toward eukaryotic dominance and reducing toxigenic cyanobacterial genotypes during intense bloom episodes, bioaugmentation with algicidal bacteria emerges as a promising strategy for bloom management and ecosystem restoration.</div></div>","PeriodicalId":311,"journal":{"name":"Environmental Pollution","volume":"374 ","pages":"Article 126261"},"PeriodicalIF":7.6,"publicationDate":"2025-04-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143837586","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Compared to fresh biochar, aged biochar has a more significant effect on mitigating greenhouse gas (GHG) emissions in farmland soil. However, there is a relative scarcity of research addressing this effect in aerobic composting. In this study, a co-composting of swine manure and rice bran (NBC), with the addition of fresh biochar (FBC) and hydrogen peroxide-aged biochar (ABC), was conducted to investigate the dynamic changes in physicochemical properties, microbial communities, GHG emissions and related functional genes during different periods. In comparison to NBC, FBC led to a 32 % decrease in total GHG emissions (CO2-equiv), including a 29 % reduction in CO2 emissions, a 45 % reduction in CH4 emissions, and a 35 % decrease in N2O emissions. Furthermore, ABC resulted in a 14 % decrease in GHG emission (CO2-equiv), comprising a 47 % reduction in CH4 emissions and a 23 % decrease in N2O emissions compared to FBC. These findings indicated that the addition of aged biochar has a more significant impact on GHG reduction during composting. Network analyses, Mantel tests and redundancy analyses suggested that the mechanism behind the lowest GHG emissions in ABC is the reduction of the relative abundance of fungi associated with CH4 emissions, along with the nirS and nirK genes associated with denitrification. This reduction is associated with the decreasing anaerobic zones resulting from the increased pore volume in biochar after aging. Overall, this study demonstrates that hydrogen peroxide aging enhances the GHG-reducing efficiency in biochar, and provides new insights into the development of GHG-reducing technologies in composting.
{"title":"Hydrogen peroxide-aged biochar mitigating greenhouse gas emissions during co-composting of swine manure with rice bran","authors":"Zixun Chen, Peng Gao, Yaoxiong Lu, Xinwei Cui, Fuyuan Peng","doi":"10.1016/j.envpol.2025.126255","DOIUrl":"10.1016/j.envpol.2025.126255","url":null,"abstract":"<div><div>Compared to fresh biochar, aged biochar has a more significant effect on mitigating greenhouse gas (GHG) emissions in farmland soil. However, there is a relative scarcity of research addressing this effect in aerobic composting. In this study, a co-composting of swine manure and rice bran (NBC), with the addition of fresh biochar (FBC) and hydrogen peroxide-aged biochar (ABC), was conducted to investigate the dynamic changes in physicochemical properties, microbial communities, GHG emissions and related functional genes during different periods. In comparison to NBC, FBC led to a 32 % decrease in total GHG emissions (CO<sub>2</sub>-equiv), including a 29 % reduction in CO<sub>2</sub> emissions, a 45 % reduction in CH<sub>4</sub> emissions, and a 35 % decrease in N<sub>2</sub>O emissions. Furthermore, ABC resulted in a 14 % decrease in GHG emission (CO<sub>2</sub>-equiv), comprising a 47 % reduction in CH<sub>4</sub> emissions and a 23 % decrease in N<sub>2</sub>O emissions compared to FBC. These findings indicated that the addition of aged biochar has a more significant impact on GHG reduction during composting. Network analyses, Mantel tests and redundancy analyses suggested that the mechanism behind the lowest GHG emissions in ABC is the reduction of the relative abundance of fungi associated with CH<sub>4</sub> emissions, along with the <em>nirS</em> and <em>nirK</em> genes associated with denitrification. This reduction is associated with the decreasing anaerobic zones resulting from the increased pore volume in biochar after aging. Overall, this study demonstrates that hydrogen peroxide aging enhances the GHG-reducing efficiency in biochar, and provides new insights into the development of GHG-reducing technologies in composting.</div></div>","PeriodicalId":311,"journal":{"name":"Environmental Pollution","volume":"374 ","pages":"Article 126255"},"PeriodicalIF":7.6,"publicationDate":"2025-04-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143831762","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
The use of biodegradable plastics as an alternative to conventional non-degradable synthetic polymers is gaining market to reduce plastic pollution, however, their biodegradability is not unconditional. In this study, we hypothesized that planktonic protists (nanoflagellates and ciliates) increase the degradation of the biodegradable PLGA (poly(lactic-co-glycolic) acid) due to particle uptake. We conducted uptake and degradation experiments using PLGA microspheres of 4.9 ± 2.8 μm diameter and the microbial planktonic community from the Baltic Sea. We found that planktonic protists ingested PLGA of different sizes, with ciliates displaying higher clearance rates and ingesting larger particles compared to nanoflagellates. In addition, we observed a more pronounced decrease in PLGA concentration and particle size over time in the presence of seawater containing microbial plankton compared to a control with only ultrapure water, suggesting that the presence of these organisms increases the rate of degradation of PLGA in marine ecosystems. Altogether, these results indicate that microbial plankton enhances the degradation of biodegradable microplastics like PLGA, specifically through rapid uptake by planktonic protists. These findings highlight the role of particle ingestion by planktonic protists in the fate of the so-called biodegradable plastics when they enter aquatic ecosystems.
{"title":"Microbial plankton uptake enhances the degradation of a biodegradable microplastic","authors":"Luca Schenone , Leonardo Capitani , Ulises Lora , Outi Setälä , Hermanni Kaartokallio , Jukka Seppälä , Maiju Lehtiniemi","doi":"10.1016/j.envpol.2025.126252","DOIUrl":"10.1016/j.envpol.2025.126252","url":null,"abstract":"<div><div>The use of biodegradable plastics as an alternative to conventional non-degradable synthetic polymers is gaining market to reduce plastic pollution, however, their biodegradability is not unconditional. In this study, we hypothesized that planktonic protists (nanoflagellates and ciliates) increase the degradation of the biodegradable PLGA (poly(lactic-co-glycolic) acid) due to particle uptake. We conducted uptake and degradation experiments using PLGA microspheres of 4.9 ± 2.8 μm diameter and the microbial planktonic community from the Baltic Sea. We found that planktonic protists ingested PLGA of different sizes, with ciliates displaying higher clearance rates and ingesting larger particles compared to nanoflagellates. In addition, we observed a more pronounced decrease in PLGA concentration and particle size over time in the presence of seawater containing microbial plankton compared to a control with only ultrapure water, suggesting that the presence of these organisms increases the rate of degradation of PLGA in marine ecosystems. Altogether, these results indicate that microbial plankton enhances the degradation of biodegradable microplastics like PLGA, specifically through rapid uptake by planktonic protists. These findings highlight the role of particle ingestion by planktonic protists in the fate of the so-called biodegradable plastics when they enter aquatic ecosystems.</div></div>","PeriodicalId":311,"journal":{"name":"Environmental Pollution","volume":"374 ","pages":"Article 126252"},"PeriodicalIF":7.6,"publicationDate":"2025-04-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143829665","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-04-14DOI: 10.1016/j.envpol.2025.126257
Hongtao Liu , Yongzheng Ma , Jingen Xiao , Ying Zhang , Yuan Li , Ao Shen , Zhiguang Niu , Qiqing Chen , Baizhu Chen
Plastic waste, including microplastics (MPs), often serves as a carrier for hydrophobic organic contaminants (HOCs) and additives in aquatic environments. However, little is known about the fate of contaminants in plastics, especially under the influence of biofilm in field conditions. In this study, polyethylene (PE) was pre-sorbed with varying concentrations of benzo[a]pyrene (BaP), a non-polar contaminant, and deployed in situ to study desorption kinetics under natural biofilm colonization. Based on the desorption kinetics of BaP from PE, a mass transfer model was developed to describe the desorption of non-polar contaminants from PE under the influence of biofilm formation. This study proved that biofilm, acting as an intermediary between plastics and the aquatic environment, did not serve as a sink for plastic-sorbed BaP, but accelerated the desorption process of BaP by reducing the partition coefficient between the plastic and the boundary layer. Furthermore, based on our developed model (IABL-ODD), the effects of biofilm on the fate of other non-polar and weakly polar contaminants in PE were predicted. This study highlights the influence of biofilm on the desorption of hydrophobic contaminants from plastics in field conditions and also informs future work on more relevant processes such as additive leaching.
{"title":"Biofilm-mediated mass transfer of sorbed benzo[a]pyrene from polyethylene to seawater","authors":"Hongtao Liu , Yongzheng Ma , Jingen Xiao , Ying Zhang , Yuan Li , Ao Shen , Zhiguang Niu , Qiqing Chen , Baizhu Chen","doi":"10.1016/j.envpol.2025.126257","DOIUrl":"10.1016/j.envpol.2025.126257","url":null,"abstract":"<div><div>Plastic waste, including microplastics (MPs), often serves as a carrier for hydrophobic organic contaminants (HOCs) and additives in aquatic environments. However, little is known about the fate of contaminants in plastics, especially under the influence of biofilm in field conditions. In this study, polyethylene (PE) was pre-sorbed with varying concentrations of benzo[a]pyrene (BaP), a non-polar contaminant, and deployed <em>in situ</em> to study desorption kinetics under natural biofilm colonization. Based on the desorption kinetics of BaP from PE, a mass transfer model was developed to describe the desorption of non-polar contaminants from PE under the influence of biofilm formation. This study proved that biofilm, acting as an intermediary between plastics and the aquatic environment, did not serve as a sink for plastic-sorbed BaP, but accelerated the desorption process of BaP by reducing the partition coefficient between the plastic and the boundary layer. Furthermore, based on our developed model (IABL-ODD), the effects of biofilm on the fate of other non-polar and weakly polar contaminants in PE were predicted. This study highlights the influence of biofilm on the desorption of hydrophobic contaminants from plastics in field conditions and also informs future work on more relevant processes such as additive leaching.</div></div>","PeriodicalId":311,"journal":{"name":"Environmental Pollution","volume":"374 ","pages":"Article 126257"},"PeriodicalIF":7.6,"publicationDate":"2025-04-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143837588","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-04-13DOI: 10.1016/j.envpol.2025.126251
Hongwen Xu , Chunlin Dong , Bing Zhang , Yang Jin , Jun Cheng , Zhilong Yu , Yukihiro Ozaki , Jinjin Yu , Ding Ma , Yunfei Xie
Microplastic (MP) pollution is an emerging environmental issue, drawing increasing attention to its potential harm to human reproductive health. This is a prospective study involving 160 human samples. MPs in tissue and blood samples were analyzed using Raman spectroscopy, while their impact on the metabolic characteristics of diseased tissues was evaluated using non-targeted techniques. The study finds that a total of 13 types of MPs are identified in all samples, with polyethylene and polypropylene being the most abundant polymers. Exposure levels of MPs are significantly higher in diseased tissues compare to normal tissues and tissues from healthy people (p < 0.01). It is also find that exposure to polyethylene increases the risk of uterine fibroids (UFs) compare to healthy individuals. Additionally, the study finds a positive correlation between MP exposure levels and the size of UFs. This suggests that polyethylene may be linked to the growth of UFs. Metabolomics analysis reveals changes in the relative abundance of key differential metabolites. Certain metabolic pathways, such as amino sugar and nucleotide sugar metabolism pathways were significantly enriched and exhibited an upward trend, while the biosynthesis of cofactors, and platelet activation pathways showed a downward trend. The findings of this study suggest a potential association between MP exposure and the development and progression of UFs in women, offering valuable insights into the underlying mechanisms research.
{"title":"The role of microplastics in elevated risk and tissues metabolic alterations in uterine fibroid of female patients","authors":"Hongwen Xu , Chunlin Dong , Bing Zhang , Yang Jin , Jun Cheng , Zhilong Yu , Yukihiro Ozaki , Jinjin Yu , Ding Ma , Yunfei Xie","doi":"10.1016/j.envpol.2025.126251","DOIUrl":"10.1016/j.envpol.2025.126251","url":null,"abstract":"<div><div>Microplastic (MP) pollution is an emerging environmental issue, drawing increasing attention to its potential harm to human reproductive health. This is a prospective study involving 160 human samples. MPs in tissue and blood samples were analyzed using Raman spectroscopy, while their impact on the metabolic characteristics of diseased tissues was evaluated using non-targeted techniques. The study finds that a total of 13 types of MPs are identified in all samples, with polyethylene and polypropylene being the most abundant polymers. Exposure levels of MPs are significantly higher in diseased tissues compare to normal tissues and tissues from healthy people (<em>p</em> < 0.01). It is also find that exposure to polyethylene increases the risk of uterine fibroids (UFs) compare to healthy individuals. Additionally, the study finds a positive correlation between MP exposure levels and the size of UFs. This suggests that polyethylene may be linked to the growth of UFs. Metabolomics analysis reveals changes in the relative abundance of key differential metabolites. Certain metabolic pathways, such as amino sugar and nucleotide sugar metabolism pathways were significantly enriched and exhibited an upward trend, while the biosynthesis of cofactors, and platelet activation pathways showed a downward trend. The findings of this study suggest a potential association between MP exposure and the development and progression of UFs in women, offering valuable insights into the underlying mechanisms research.</div></div>","PeriodicalId":311,"journal":{"name":"Environmental Pollution","volume":"374 ","pages":"Article 126251"},"PeriodicalIF":7.6,"publicationDate":"2025-04-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143827601","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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