Environmental Research最新文献_第8页

In-situ preparation of highly dispersed Fe doping C3N5 induced by inorganic iron salts with effective activation of PMS for photocatalytic degradation of chlortetracycline

IF 7.7 2区环境科学与生态学 Q1 ENVIRONMENTAL SCIENCES

Environmental Research

Pub Date : 2025-04-11 DOI: 10.1016/j.envres.2025.121596

Yao Jiang, Haiying Du, Ji Liu

A highly dispersed Fe in situ doped C₃N₅ (Fe-C₃N₅) photocatalyst utilizing inorganic iron salt was successfully prepared, which was applied in photocatalytic synergistic advanced oxidative degradation of chlortetracycline (CTC) under the activation with persulfate. BET measurements revealed that uniform Fe doping increases the specific surface area, thus enhancing the reactive active sites. Photoelectric tests indicate that Fe doping optimizes the energy band structure of C₃N₅, thereby enhancing electron transfer, and the photogenerated electrons facilitate the Fe²⁺/Fe³⁺ redox cycle, which is beneficial for the sustained and efficient activation of persulfates. The Fe-C₃N₅(50 %)/PMS/Vis system achieved over 95 % degradation of CTC within 2 h, after four cycles, the Fe-C₃N₅(50 %) still exhibits good reusability and stability. Free radical quenching experiments coupled with EPR spectroscopy identified ¹O₂, h⁺, and ·O₂⁻ as the dominant reactive species driving the degradation of CTC, elucidating the potential degradation mechanisms. Based on LC-MS measurements and utilizing the TEST toxicity assessment software, it has been determined that CTC ultimately decomposes into non-toxic small molecules, such as CO₂ and H₂O. Furthermore, a hydroponic germination experiment using mung beans was conducted to demonstrate that Fe-C₃N₅(50 %) does not exhibit toxic effects on plant growth. Importantly, this study offers novel insights into the green synthesis of highly dispersed Fe doping C₃N₅ photocatalytic for the efficient degradation of CTC.

{"title":"In-situ preparation of highly dispersed Fe doping C3N5 induced by inorganic iron salts with effective activation of PMS for photocatalytic degradation of chlortetracycline","authors":"Yao Jiang, Haiying Du, Ji Liu","doi":"10.1016/j.envres.2025.121596","DOIUrl":"10.1016/j.envres.2025.121596","url":null,"abstract":"<div><div>A highly dispersed Fe in situ doped C<sub>3</sub>N<sub>5</sub> (Fe-C<sub>3</sub>N<sub>5</sub>) photocatalyst utilizing inorganic iron salt was successfully prepared, which was applied in photocatalytic synergistic advanced oxidative degradation of chlortetracycline (CTC) under the activation with persulfate. BET measurements revealed that uniform Fe doping increases the specific surface area, thus enhancing the reactive active sites. Photoelectric tests indicate that Fe doping optimizes the energy band structure of C<sub>3</sub>N<sub>5</sub>, thereby enhancing electron transfer, and the photogenerated electrons facilitate the Fe<sup>2+</sup>/Fe<sup>3+</sup> redox cycle, which is beneficial for the sustained and efficient activation of persulfates. The Fe-C<sub>3</sub>N<sub>5</sub>(50 %)/PMS/Vis system achieved over 95 % degradation of CTC within 2 h, after four cycles, the Fe-C<sub>3</sub>N<sub>5</sub>(50 %) still exhibits good reusability and stability. Free radical quenching experiments coupled with EPR spectroscopy identified <sup>1</sup>O<sub>2</sub>, h<sup>+</sup>, and ·O<sub>2</sub><sup>−</sup> as the dominant reactive species driving the degradation of CTC, elucidating the potential degradation mechanisms. Based on LC-MS measurements and utilizing the TEST toxicity assessment software, it has been determined that CTC ultimately decomposes into non-toxic small molecules, such as CO<sub>2</sub> and H<sub>2</sub>O. Furthermore, a hydroponic germination experiment using mung beans was conducted to demonstrate that Fe-C<sub>3</sub>N<sub>5</sub>(50 %) does not exhibit toxic effects on plant growth. Importantly, this study offers novel insights into the green synthesis of highly dispersed Fe doping C<sub>3</sub>N<sub>5</sub> photocatalytic for the efficient degradation of CTC.</div></div>","PeriodicalId":312,"journal":{"name":"Environmental Research","volume":"277 ","pages":"Article 121596"},"PeriodicalIF":7.7,"publicationDate":"2025-04-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143855618","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}

引用次数: 0

The treated wastewater enhances the biodegradation of sulfonamide antibiotics in biofilm-sediment downstream of the receiving river outlet

IF 7.7 2区环境科学与生态学 Q1 ENVIRONMENTAL SCIENCES

Environmental Research

Pub Date : 2025-04-11 DOI: 10.1016/j.envres.2025.121600

Ke Jing, Ying Li, Yinghao Li, Qinglong Meng, Qingyu Guan

Although the treated wastewater meets the discharge standards, it can still become a potential transmitted stressor that affects aquatic organisms in receiving rivers. Biofilms and sediments as the main solid-phase substances in natural aquatic environments can biodegrade micropollutants. However, most of the current studies have selected a single solid-phase material, and there are relatively few studies that comprehensively consider the effect of treated wastewater on the dissipation of micropollutants in a composite biofilm-sediment system. Therefore, this study investigated the dissipation pathways of six sulfonamide antibiotics (SAs) in biofilm-sediment and the effect of treated wastewater on SAs dissipation. The results showed that biodegradation was the main pathway for SAs dissipation in biofilm-sediment. The input of treated wastewater increased the abundance of dominant degradation bacteria Burkholderiales and Pseudomonadale, thereby improving the biodegradation rate of SAs (approximately 1.5 times higher than upstream degradation rate). These genera could also be further integrated into downstream communities to continuously mediate the biodegradation of SAs. Through mass spectrometry and metagenomic sequencing analysis, it was found that the common degradation pathways of SAs in biofilm-sediment affected by treated wastewater are acetylation, formylation, hydroxylation, and bond cleavage. Acetyltransferase played an important role in the biodegradation of SAs. In addition, the enrichment of antibiotic resistant genes during biodegradation increased the risk of their spread in the aquatic environment. These findings provide new insights into the fate of antibiotics in aquatic environments and the impact of treated wastewater on downstream bacterial communities.

{"title":"The treated wastewater enhances the biodegradation of sulfonamide antibiotics in biofilm-sediment downstream of the receiving river outlet","authors":"Ke Jing, Ying Li, Yinghao Li, Qinglong Meng, Qingyu Guan","doi":"10.1016/j.envres.2025.121600","DOIUrl":"10.1016/j.envres.2025.121600","url":null,"abstract":"<div><div>Although the treated wastewater meets the discharge standards, it can still become a potential transmitted stressor that affects aquatic organisms in receiving rivers. Biofilms and sediments as the main solid-phase substances in natural aquatic environments can biodegrade micropollutants. However, most of the current studies have selected a single solid-phase material, and there are relatively few studies that comprehensively consider the effect of treated wastewater on the dissipation of micropollutants in a composite biofilm-sediment system. Therefore, this study investigated the dissipation pathways of six sulfonamide antibiotics (SAs) in biofilm-sediment and the effect of treated wastewater on SAs dissipation. The results showed that biodegradation was the main pathway for SAs dissipation in biofilm-sediment. The input of treated wastewater increased the abundance of dominant degradation bacteria <em>Burkholderiales</em> and <em>Pseudomonadale</em>, thereby improving the biodegradation rate of SAs (approximately 1.5 times higher than upstream degradation rate). These genera could also be further integrated into downstream communities to continuously mediate the biodegradation of SAs. Through mass spectrometry and metagenomic sequencing analysis, it was found that the common degradation pathways of SAs in biofilm-sediment affected by treated wastewater are acetylation, formylation, hydroxylation, and bond cleavage. Acetyltransferase played an important role in the biodegradation of SAs. In addition, the enrichment of antibiotic resistant genes during biodegradation increased the risk of their spread in the aquatic environment. These findings provide new insights into the fate of antibiotics in aquatic environments and the impact of treated wastewater on downstream bacterial communities.</div></div>","PeriodicalId":312,"journal":{"name":"Environmental Research","volume":"277 ","pages":"Article 121600"},"PeriodicalIF":7.7,"publicationDate":"2025-04-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143824492","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}

引用次数: 0

Satellite-empowered public health: Mapping coastal fecal contamination risks through Sentinel-2 imagery

IF 7.7 2区环境科学与生态学 Q1 ENVIRONMENTAL SCIENCES

Environmental Research

Pub Date : 2025-04-11 DOI: 10.1016/j.envres.2025.121586

Yuwei Kong , Karina Jimenez , Christine M. Lee , Xunyi Wu , Jennifer A. Jay

Coastal waters serve as essential ecological habitats, key drivers of the blue economy, and vital resources for public health. However, increasing anthropogenic pressures, coupled with climate-driven perturbations, present significant challenges to microbial water quality. While remote sensing has been widely adopted for assessing physicochemical water quality parameters, its application to microbial indicators remains limited. To evaluate the feasibility of integrating satellite observations into microbial water quality assessments, this study investigated the hypothesis that satellite derived suspended matter concentrations predict levels of fecal indicator bacteria, Escherichia coli (E. coli), which are linked to human health through epidemiological studies. A moderate correlation was observed with the Sentinel-2 derived total suspended matter (SPM) and in situ E. coli concentrations (r = 0.73, p < 0.001), and the positive correlation was also validated using a historical dataset obtained from the California Water Board. The results indicate that using satellite data for estimating E. coli concentrations in coastal waters is feasible. This approach can enhance the performance and expand the scope of pollution event warning systems, demonstrating the valuable role of satellite data in environmental monitoring and public health protection.

{"title":"Satellite-empowered public health: Mapping coastal fecal contamination risks through Sentinel-2 imagery","authors":"Yuwei Kong , Karina Jimenez , Christine M. Lee , Xunyi Wu , Jennifer A. Jay","doi":"10.1016/j.envres.2025.121586","DOIUrl":"10.1016/j.envres.2025.121586","url":null,"abstract":"<div><div>Coastal waters serve as essential ecological habitats, key drivers of the blue economy, and vital resources for public health. However, increasing anthropogenic pressures, coupled with climate-driven perturbations, present significant challenges to microbial water quality. While remote sensing has been widely adopted for assessing physicochemical water quality parameters, its application to microbial indicators remains limited. To evaluate the feasibility of integrating satellite observations into microbial water quality assessments, this study investigated the hypothesis that satellite derived suspended matter concentrations predict levels of fecal indicator bacteria, <em>Escherichia coli</em> (<em>E. coli</em>), which are linked to human health through epidemiological studies. A moderate correlation was observed with the Sentinel-2 derived total suspended matter (SPM) and in situ <em>E. coli</em> concentrations (r = 0.73, p < 0.001), and the positive correlation was also validated using a historical dataset obtained from the California Water Board. The results indicate that using satellite data for estimating <em>E. coli</em> concentrations in coastal waters is feasible. This approach can enhance the performance and expand the scope of pollution event warning systems, demonstrating the valuable role of satellite data in environmental monitoring and public health protection.</div></div>","PeriodicalId":312,"journal":{"name":"Environmental Research","volume":"278 ","pages":"Article 121586"},"PeriodicalIF":7.7,"publicationDate":"2025-04-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143874049","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}

引用次数: 0

The vertical distribution and metabolic versatility of complete ammonia oxidizing communities in mangrove sediments 红树林沉积物中完整氨氧化群落的垂直分布和代谢多样性

IF 7.7 2区环境科学与生态学 Q1 ENVIRONMENTAL SCIENCES

Environmental Research

Pub Date : 2025-04-11 DOI: 10.1016/j.envres.2025.121602

Xinlei Yang , Xiaoli Yu , Yuzhen Ming , Huanping Liu , Wengen Zhu , Bozhi Yan , Huaxia Huang , Lang Ding , Xin Qian , Yukun Wang , Kun Wu , Mingyang Niu , Qingyun Yan , Xiaohong Huang , Cheng Wang , Yuejun Wang , Zhili He

Recently discovered complete ammonia-oxidizing (comammox) microorganisms can completely oxidize ammonia to nitrate and play an important role in the nitrogen (N) cycle across various ecosystems. However, little is known about the vertical distribution and metabolic versatility of comammox communities in mangrove ecosystems. Here we profiled comammox communities from deep sediments (up to 5 m) in a mangrove wetland by combining metagenome sequencing and physicochemical properties analysis. Our results showed that the relative abundance of comammox bacteria (23.2 %) was higher than ammonia-oxidizing bacteria (AOB, 12.0 %), but lower than ammonia-oxidizing archaea (AOA, 64.8 %). The abundance of comammox communities significantly (p < 0.01) decreased with the sediment depth, and dissolved organic carbon and total sulfur appeared to be major environmental factors influencing the nitrifying microbial community structure. We also recovered a high-quality metagenome-assembled genome (MAG) of comammox bacteria (Nitrospira sp. bin2030) affiliated with comammox clade A. Nitrospira sp. bin2030 possessed diverse metabolic processes, not only the key genes for ammonia oxidation and urea utilization in the N cycle, but also key genes involved in carbon and energy metabolisms, sulfur metabolism, and environmental adaptation (e.g., oxidative stress, salinity, temperature, heavy metal tolerance). The findings advance our understanding of vertical distribution and metabolic versatility of comammox communities in mangrove sediments, having important implications for quantifying their contribution to nitrification processes in mangrove ecosystems.

{"title":"The vertical distribution and metabolic versatility of complete ammonia oxidizing communities in mangrove sediments","authors":"Xinlei Yang , Xiaoli Yu , Yuzhen Ming , Huanping Liu , Wengen Zhu , Bozhi Yan , Huaxia Huang , Lang Ding , Xin Qian , Yukun Wang , Kun Wu , Mingyang Niu , Qingyun Yan , Xiaohong Huang , Cheng Wang , Yuejun Wang , Zhili He","doi":"10.1016/j.envres.2025.121602","DOIUrl":"10.1016/j.envres.2025.121602","url":null,"abstract":"<div><div>Recently discovered complete ammonia-oxidizing (comammox) microorganisms can completely oxidize ammonia to nitrate and play an important role in the nitrogen (N) cycle across various ecosystems. However, little is known about the vertical distribution and metabolic versatility of comammox communities in mangrove ecosystems. Here we profiled comammox communities from deep sediments (up to 5 m) in a mangrove wetland by combining metagenome sequencing and physicochemical properties analysis. Our results showed that the relative abundance of comammox bacteria (23.2 %) was higher than ammonia-oxidizing bacteria (AOB, 12.0 %), but lower than ammonia-oxidizing archaea (AOA, 64.8 %). The abundance of comammox communities significantly (<em>p</em> < 0.01) decreased with the sediment depth, and dissolved organic carbon and total sulfur appeared to be major environmental factors influencing the nitrifying microbial community structure. We also recovered a high-quality metagenome-assembled genome (MAG) of comammox bacteria (<em>Nitrospira</em> sp. bin2030) affiliated with comammox clade A. <em>Nitrospira</em> sp. bin2030 possessed diverse metabolic processes, not only the key genes for ammonia oxidation and urea utilization in the N cycle, but also key genes involved in carbon and energy metabolisms, sulfur metabolism, and environmental adaptation (e.g., oxidative stress, salinity, temperature, heavy metal tolerance). The findings advance our understanding of vertical distribution and metabolic versatility of comammox communities in mangrove sediments, having important implications for quantifying their contribution to nitrification processes in mangrove ecosystems.</div></div>","PeriodicalId":312,"journal":{"name":"Environmental Research","volume":"277 ","pages":"Article 121602"},"PeriodicalIF":7.7,"publicationDate":"2025-04-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143830173","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}

引用次数: 0

Surface-groundwater interactions and recharge sources in the upper Yamuna River basin: Insights from stable isotopic signatures and hydrogeochemical processes

IF 7.7 2区环境科学与生态学 Q1 ENVIRONMENTAL SCIENCES

Environmental Research

Pub Date : 2025-04-11 DOI: 10.1016/j.envres.2025.121587

Shijin Rajan, Janardhana Raju Nandimandalam

The interaction between surface and groundwater is vital for sustaining the hydrological system and ecosystem balance. This study investigates river water-groundwater connectivity and recharge sources in the upper Yamuna River basin (UYRB) by integrating stable isotopes (δ¹⁸O and δ²H), hydrogeochemistry, and statistical analyses. Spanning the Himalayas and alluvial plains, the UYRB presents diverse topography, climatic conditions and human interferences, making it ideal for exploring spatial and seasonal effects on water resources. A total of 233 samples, including river water (n = 60), groundwater (n = 106), spring water (n = 18), rainwater (n = 35), and fresh snow (n = 14) were collected during 2022 to draw the results. Hydrochemical parameters exhibit a significant (p < 0.05) spatiotemporal influence, with glacial and snowmelt driving summer recharge in the upper catchment (UC), whereas ISM-driven precipitation dominates downstream recharge. River water isotopic composition is strongly influenced by altitude (summer: ILR = −0.36 ‰ per 100 m for δ¹⁸O, R² = 0.4, p = 0.0004; winter: ILR = −0.17 ‰, R² = 0.5, p < 0.0001), though this effect is less pronounced in rainfall, groundwater and spring water. Distinct ion chemistry characterises the UYRB with Ca.Mg-HCO₃ water types prevail in the upper and mid-catchments, while mixed or saline types dominant in the lower catchment. Groundwater and river water isotopes closely align with the derived LMWL (δ²H = 7.63 × δ¹⁸O + 7.83; R² = 0.99), indicating the signatures of regional precipitation in their recharge. Elevated d-excess values in UC rainfall (

\overline{x}

= 12.3 ‰) and snow (

\overline{x}

= 18.1 ‰) suggest a combined influence of ISM and WD on regional moisture distribution. The multivariate analyses (PCA and HCA) confirm strong river water and groundwater interactions, particularly in the lower catchment. This study highlights catchment-specific RW-GW interactions and recharge sources in the water-scarce UYRB, providing critical insights for regional climate-resilient water resource management.

{"title":"Surface-groundwater interactions and recharge sources in the upper Yamuna River basin: Insights from stable isotopic signatures and hydrogeochemical processes","authors":"Shijin Rajan, Janardhana Raju Nandimandalam","doi":"10.1016/j.envres.2025.121587","DOIUrl":"10.1016/j.envres.2025.121587","url":null,"abstract":"<div><div>The interaction between surface and groundwater is vital for sustaining the hydrological system and ecosystem balance. This study investigates river water-groundwater connectivity and recharge sources in the upper Yamuna River basin (UYRB) by integrating stable isotopes (δ<sup>18</sup>O and δ<sup>2</sup>H), hydrogeochemistry, and statistical analyses. Spanning the Himalayas and alluvial plains, the UYRB presents diverse topography, climatic conditions and human interferences, making it ideal for exploring spatial and seasonal effects on water resources. A total of 233 samples, including river water (n = 60), groundwater (n = 106), spring water (n = 18), rainwater (n = 35), and fresh snow (n = 14) were collected during 2022 to draw the results. Hydrochemical parameters exhibit a significant (p < 0.05) spatiotemporal influence, with glacial and snowmelt driving summer recharge in the upper catchment (UC), whereas ISM-driven precipitation dominates downstream recharge. River water isotopic composition is strongly influenced by altitude (summer: ILR = −0.36 ‰ per 100 m for δ<sup>18</sup>O, R<sup>2</sup> = 0.4, p = 0.0004; winter: ILR = −0.17 ‰, R<sup>2</sup> = 0.5, p < 0.0001), though this effect is less pronounced in rainfall, groundwater and spring water. Distinct ion chemistry characterises the UYRB with Ca.Mg-HCO<sub>3</sub> water types prevail in the upper and mid-catchments, while mixed or saline types dominant in the lower catchment. Groundwater and river water isotopes closely align with the derived LMWL (δ<sup>2</sup>H = 7.63 × δ<sup>18</sup>O + 7.83; R<sup>2</sup> = 0.99), indicating the signatures of regional precipitation in their recharge. Elevated d-excess values in UC rainfall (<span><math><mrow><mover><mi>x</mi><mo>‾</mo></mover></mrow></math></span> = 12.3 ‰) and snow (<span><math><mrow><mover><mi>x</mi><mo>‾</mo></mover></mrow></math></span> = 18.1 ‰) suggest a combined influence of ISM and WD on regional moisture distribution. The multivariate analyses (PCA and HCA) confirm strong river water and groundwater interactions, particularly in the lower catchment. This study highlights catchment-specific RW-GW interactions and recharge sources in the water-scarce UYRB, providing critical insights for regional climate-resilient water resource management.</div></div>","PeriodicalId":312,"journal":{"name":"Environmental Research","volume":"277 ","pages":"Article 121587"},"PeriodicalIF":7.7,"publicationDate":"2025-04-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143834044","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}

引用次数: 0

Reutilization of steel slag (SS) in super sulfate cement (SSC): A comparative study of SS dosage and carbonation treatment on strength development, hydration behavior and sustainable development

IF 7.7 2区环境科学与生态学 Q1 ENVIRONMENTAL SCIENCES

Environmental Research

Pub Date : 2025-04-10 DOI: 10.1016/j.envres.2025.121580

Xiaowei Ge , Xiaowei Gu , Jianping Liu , Ge Song , Shaoqian Liu , Xu Wang , Shenyu Wang , Ziyang Hu , Hao Wang , Moncef L. Nehdi

The development of low-carbon cementitious materials is one of the important ways to alleviate the problem of large accumulation of industrial by-products and reduce high energy consumption and high carbon emissions in the cement industry. This study investigated the possibility of using steel slag (SS) as an alkaline activator to prepare super sulfate cement (SSC). The hydration reaction test (hydration heat and pH value) and microscopic characterization (XRD, FTIR, TG and SEM) were used to systematically study the influence mechanism of SS dosage and its carbonation treatment on the macroscopic mechanical properties of the samples. The results show that SS has excellent carbonation reaction activity, and the degree of carbonation increase within 24 h reaches 10.71 %. Under the action of 6 wt% SS or 15 wt% carbonated steel slag (CS), the hydration degree of ground granulated blast-furnace slag (GGBS) was improved, the content of hydration products such as ettringite (AFt) was significantly increased, the crystal structure was improved (grain size, polymerization degree and Ca/Si ratio), and the pore structure of the matrix was more compact. Compared with ordinary Portland cement (OPC) and SSC, the CO₂ emissions and production costs of NUS and NCS samples are significantly reduced. These insights provide a potential possibility for the scale utilization of SS, which is conducive to promoting the green transformation and development of the construction industry.

{"title":"Reutilization of steel slag (SS) in super sulfate cement (SSC): A comparative study of SS dosage and carbonation treatment on strength development, hydration behavior and sustainable development","authors":"Xiaowei Ge , Xiaowei Gu , Jianping Liu , Ge Song , Shaoqian Liu , Xu Wang , Shenyu Wang , Ziyang Hu , Hao Wang , Moncef L. Nehdi","doi":"10.1016/j.envres.2025.121580","DOIUrl":"10.1016/j.envres.2025.121580","url":null,"abstract":"<div><div>The development of low-carbon cementitious materials is one of the important ways to alleviate the problem of large accumulation of industrial by-products and reduce high energy consumption and high carbon emissions in the cement industry. This study investigated the possibility of using steel slag (SS) as an alkaline activator to prepare super sulfate cement (SSC). The hydration reaction test (hydration heat and pH value) and microscopic characterization (XRD, FTIR, TG and SEM) were used to systematically study the influence mechanism of SS dosage and its carbonation treatment on the macroscopic mechanical properties of the samples. The results show that SS has excellent carbonation reaction activity, and the degree of carbonation increase within 24 h reaches 10.71 %. Under the action of 6 wt% SS or 15 wt% carbonated steel slag (CS), the hydration degree of ground granulated blast-furnace slag (GGBS) was improved, the content of hydration products such as ettringite (AFt) was significantly increased, the crystal structure was improved (grain size, polymerization degree and Ca/Si ratio), and the pore structure of the matrix was more compact. Compared with ordinary Portland cement (OPC) and SSC, the CO<sub>2</sub> emissions and production costs of NUS and NCS samples are significantly reduced. These insights provide a potential possibility for the scale utilization of SS, which is conducive to promoting the green transformation and development of the construction industry.</div></div>","PeriodicalId":312,"journal":{"name":"Environmental Research","volume":"277 ","pages":"Article 121580"},"PeriodicalIF":7.7,"publicationDate":"2025-04-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143855619","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}

引用次数: 0

Recycling C and N from biogas slurry and wastewater of hydrothermal carbonization to rice-paddy systems: Enhanced soil dissolved C and N retention

IF 7.7 2区环境科学与生态学 Q1 ENVIRONMENTAL SCIENCES

Environmental Research

Pub Date : 2025-04-10 DOI: 10.1016/j.envres.2025.121584

Detian Li , Qingnan Chu , Cong Qian , Xiangyu Liu , Chengrong Chen , Lihong Xue , Yanfang Feng

This study explores a sustainable agricultural approach by mixing biogas slurry (BS) with hydrothermal carbonization aqueous phase (HCAP) to recycle carbon and nitrogen to rice-paddy system. Over two years, the effects of combining swine-derived BS with vegetable-derived HCAP as an alternative for synthesized nitrogen fertilizer in a rice-paddy system were evaluated. Four nitrogen substitution rates were tested: 0 % (control group, CKU), 50 % (low nitrogen substitution rate, BSVL), 75 % (medium nitrogen substitution rate, BSVM), and 100 % (high nitrogen substitution rate, BSVH). Results demonstrated combined application of BS and HCAP significantly improved soil dissolved organic matter (DOM) and total nitrogen content by 28.5–82.5 % and 5.8–7.2 %, respectively, with positive correlations to the increase in nitrogen substitution rate (P < 0.05). The DOM components revealed substantial increases in microbial by-product-like and fulvic acid-like substances in the soil, by 0.6–2.0 folds and 2.8–10.3 folds, respectively. Ammonia volatilization was significantly reduced by 15.6–46.3 % and 2.2–12.6 % across two years, correlating with pH and ammonium levels in floodwater (P < 0.05). Additionally, substituting chemical nitrogen fertilizer with BS and HCAP maintained grain nitrogen content without compromising rice nitrogen uptake. The results of structural equation model indicate that substituting nitrogen with BS and HCAP enhanced the recycling of carbon and nitrogen in paddy soil by improving soil DOM and total nitrogen accumulation. Overall, this study presents a viable strategy for recycling carbon and nitrogen from BS and HCAP into paddy soil, thereby substituting chemical fertilizers and enhancing soil fertility.

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引用次数: 0

Retraction notice to “Photocatalytic assessed adsorptive removal of tinidazole from aqueous environment using reduced magnetic graphene oxide-bismuth oxychloride and its silver composite” [Environ. Res. 215-P2 (2022) 114262]

IF 7.7 2区环境科学与生态学 Q1 ENVIRONMENTAL SCIENCES

Environmental Research

Pub Date : 2025-04-10 DOI: 10.1016/j.envres.2025.121532

Saba Sohani , Behisht Ara , Hamayun Khan , Kashif Gul , Mansoor Khan

引用次数: 0

Ecological impacts of treated effluent on multitrophic biodiversity and their interactions

IF 7.7 2区环境科学与生态学 Q1 ENVIRONMENTAL SCIENCES

Environmental Research

Pub Date : 2025-04-10 DOI: 10.1016/j.envres.2025.121585

Wei Xiong , Ting Chen , Xun Du , Lin Hou , Yiyong Chen , Jing-Long Han , Aibin Zhan

The reuse of water, particularly treated effluent from wastewater treatment plants (WWTPs), is a crucial and sustainable strategy for mitigating water scarcity, especially in megacities with high water demand and limited resources. However, the ecological risks associated with effluent discharge into receiving waterbodies have gained significant global attention. Understanding the dynamic effects of WWTP effluent on multi-trophic groups and their interactions is essential for assessing ecological impacts in aquatic ecosystems and informing management strategies. In this study, we examined five taxonomic groups representing different trophic levels of the freshwater food web - bacteria (decomposers), algae (primary producers), zooplankton (primary consumers), and benthic macroinvertebrates and fish (predators) - across two rivers to elucidate ecological responses to WWTP effluent from a multi-trophic perspective. Our results revealed significant but variable biological responses among these groups, depending on river conditions and trophic level. In the nutrient-rich river, primary consumers (zooplankton) were most affected, whereas in the nutrient-poor river, primary producers (algae) exhibited the strongest responses primarily derived from environmental disturbances. Notably, interactions between environmental variables and taxa were highly diverse, with trophic dynamics influenced by both bottom-up and top-down processes in the nutrient-rich river, whereas bottom-up effects dominated in the nutrient-poor river. Furthermore, niche overlap in algae-zooplankton networks was higher in the nutrient-rich river than in the nutrient-poor river. This study underscores the importance of integrating multi-trophic biodiversity profiling and trophic interaction analyses to comprehensively assess the ecological effects of WWTP effluent in receiving aquatic ecosystems with contrasting environmental contexts. Our findings highlight the importance of conservation and sustainable management practices, especially in urban aquatic ecosystems located in (semi-)arid regions that experience prolonged periods of low precipitation.

水的回用，特别是污水处理厂（WWTPs）处理后的污水，是缓解水资源短缺的一项重要的可持续战略，尤其是在水资源需求量大而资源有限的特大城市。然而，污水排放到受纳水体所带来的生态风险已引起全球的高度关注。了解污水处理厂污水对多营养群的动态影响及其相互作用，对于评估水生生态系统的生态影响和制定管理策略至关重要。在本研究中，我们考察了两条河流中代表淡水食物网不同营养级的五个分类群--细菌（分解者）、藻类（初级生产者）、浮游动物（初级消费者）以及底栖大型无脊椎动物和鱼类（捕食者），从多营养级的角度来阐明污水处理厂污水的生态响应。我们的研究结果表明，根据河流条件和营养级的不同，这些群体之间的生物反应显著但各不相同。在营养物质丰富的河流中，初级消费者（浮游动物）受到的影响最大，而在营养物质贫乏的河流中，初级生产者（藻类）的反应最强烈，主要是由于环境干扰。值得注意的是，环境变量与分类群之间的相互作用是高度多样化的，在营养丰富的河流中，营养动态受到自下而上和自上而下过程的影响，而在营养贫乏的河流中，自下而上的影响占主导地位。此外，营养丰富的河流中藻类-浮游动物网络的生态位重叠程度高于营养贫乏的河流。本研究强调了综合多营养生物多样性剖析和营养相互作用分析的重要性，以全面评估污水处理厂污水在环境背景截然不同的受纳水生生态系统中的生态效应。我们的研究结果强调了保护和可持续管理实践的重要性，尤其是在位于（半）干旱地区、降水量长期偏低的城市水生生态系统中。

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引用次数: 0

Exploring phylogenetic diversity of antibiotic resistance genes in activated sludge: A host and genomic location perspective

IF 7.7 2区环境科学与生态学 Q1 ENVIRONMENTAL SCIENCES

Environmental Research

Pub Date : 2025-04-10 DOI: 10.1016/j.envres.2025.121588

Shengnan Liu , Jie Li , Zepeng Zhang , Jinhua Tuo , Qifeng Zhang , Jiawei Zhou , Peng Liu , Xu-Xiang Zhang

Antibiotic resistance has emerged as a significant global public health issue. The environmental behaviors of antibiotic resistance genes (ARGs), such as their persistence and horizontal transfer, have been extensively investigated. However, the genetic diversity characteristics of ARGs remain underexplored, which limits a comprehensive analysis of their roles in the environment. In this study, we examined the genetic diversity of ARGs in activated sludge from 44 wastewater treatment plants in five countries. Most ARGs detected in activated sludge possessed multiple variants, with a median of 48. The number of variants of gd-ARGs varied among different resistance mechanisms and ARG types. The number of potential variants of ARGs was strongly correlated with host diversity. Pseudomonas spp. and Klebsiella pneumoniae, identified as pathogenic bacteria, harbored multiple ARGs and had the most variants. Most ARG subtypes on plasmids and chromosomes showed divergent evolution. Molecular docking of AdeH proteins revealed that genomic location affects tetracycline binding energy. The findings underscore the intricate interplay between genetic variation and environmental adaptation in ARGs, offering a novel perspective on the spread of antibiotic resistance.

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引用次数: 0