Pub Date : 2023-11-01DOI: 10.1016/j.eti.2023.103411
Aimin Li, Yuzhi Li, Kaiwen Huang, Lian Song, Fei Shen, Shuo Wang, Ji Li
Conventional conditioners are not conducive to the sludge separate incineration process. The agricultural wastes bamboo powder (BP) and rice husk powder (RHP) have strong toughness and porosity, which has the potential to replace quicklime as a sludge conditioner. When the dosage of BP and RHP is 30% of the sludge dry solids, the dewatering performance of sludge was greatly improved after sludge was conditioned with BP and RHP respectively, where the specific resistance of sludge was reduced from 4.6×1012 m/kg to 1.3×1012 and 0.9×1012 m/kg. In addition, the sludge conditioned by BP and RHP acquired better filtrate quality, which is conducive to the stable operation of the wastewater treatment plants (WWTPs). The components of extracellular polymer substances (EPS) showed that the tightly bound-EPS (TB-EPS) decreased by 36.6% after conditioning with quicklime, while the TB-EPS maintained with BP and RHP conditioning, indicating that the dewatering mechanism of BP and RHP involves physical activities to work as the skeleton builder. The use of BP and RHP increased the enrichment effect of nitrogen and phosphorus in the sludge cake, yet the contents of heavy metals Cd, Pb and Zn were below the sludge land use limit. Combined with the ecological risk assessment by the methods of the Geoaccumulation index (Igeo), the Nemerow pollution index (PI) and the potential ecological risk index (RI), the ecological risk index of quicklime-conditioned sludge is higher when the dewatered sludge is composted and applied for land use, while the ecological risk after conditioning by BP and RHP is in a slightly polluted or non-polluted state, therefore the application of BP and RHP as the deep dewatering conditioners possesses practical potential for land use.
{"title":"Sustainable use of rice husk powder and bamboo powder as sludge deep dewatering conditioners in pilot-scale application: feasibility for incineration and potential application for land use","authors":"Aimin Li, Yuzhi Li, Kaiwen Huang, Lian Song, Fei Shen, Shuo Wang, Ji Li","doi":"10.1016/j.eti.2023.103411","DOIUrl":"https://doi.org/10.1016/j.eti.2023.103411","url":null,"abstract":"Conventional conditioners are not conducive to the sludge separate incineration process. The agricultural wastes bamboo powder (BP) and rice husk powder (RHP) have strong toughness and porosity, which has the potential to replace quicklime as a sludge conditioner. When the dosage of BP and RHP is 30% of the sludge dry solids, the dewatering performance of sludge was greatly improved after sludge was conditioned with BP and RHP respectively, where the specific resistance of sludge was reduced from 4.6×1012 m/kg to 1.3×1012 and 0.9×1012 m/kg. In addition, the sludge conditioned by BP and RHP acquired better filtrate quality, which is conducive to the stable operation of the wastewater treatment plants (WWTPs). The components of extracellular polymer substances (EPS) showed that the tightly bound-EPS (TB-EPS) decreased by 36.6% after conditioning with quicklime, while the TB-EPS maintained with BP and RHP conditioning, indicating that the dewatering mechanism of BP and RHP involves physical activities to work as the skeleton builder. The use of BP and RHP increased the enrichment effect of nitrogen and phosphorus in the sludge cake, yet the contents of heavy metals Cd, Pb and Zn were below the sludge land use limit. Combined with the ecological risk assessment by the methods of the Geoaccumulation index (Igeo), the Nemerow pollution index (PI) and the potential ecological risk index (RI), the ecological risk index of quicklime-conditioned sludge is higher when the dewatered sludge is composted and applied for land use, while the ecological risk after conditioning by BP and RHP is in a slightly polluted or non-polluted state, therefore the application of BP and RHP as the deep dewatering conditioners possesses practical potential for land use.","PeriodicalId":11899,"journal":{"name":"Environmental Technology and Innovation","volume":"40 11","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135111376","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
This study investigated the effects of inoculating thermophilic and mature composts on maturity, gaseous emissions, and bacterial communities during the co-composting of kitchen waste and pig manure. Results showed that the temperature peaked on day 4 of the inoculation compost amendment, which was earlier than the control treatment on day 8. In particular, the GI of the inoculated thermophilic compost was higher (88.65%) than that of other treatments (GI≤61%) on day 35. The addition of the thermophilic compost promoted the enrichment of Bacillus and Planifilum, accelerated organic matter degradation, and enhanced maturity. Inoculation with mature compost reduced CH4 emissions by 50.66%, owing to the enrichment of methane-oxidizing bacteria (norank_f_Methylococcaceae). Furthermore, the mature compost decreased NH3 emissions by 36.16% through physical absorption and microbial activity (reducing NH4+ production). Inoculation with compost amendment increased N2O emissions owing to the enhanced denitrification of the nitrate reduction function. Overall, thermophilic compost addition enhanced the composting process and improved maturity, whereas mature compost addition was more effective in reducing gaseous emissions during the co-composting of kitchen waste and pig manure.
{"title":"Thermophilic compost inoculating promoted the maturity and mature compost inoculating reduced the gaseous emissions during co-composting of kitchen waste and pig manure","authors":"Guoliang Liu, Yan Yang, Ruonan Ma, Jinhui Jiang, Guoxue Li, Jiani Wang, Dalai Wuyun, Jing Yuan","doi":"10.1016/j.eti.2023.103427","DOIUrl":"https://doi.org/10.1016/j.eti.2023.103427","url":null,"abstract":"This study investigated the effects of inoculating thermophilic and mature composts on maturity, gaseous emissions, and bacterial communities during the co-composting of kitchen waste and pig manure. Results showed that the temperature peaked on day 4 of the inoculation compost amendment, which was earlier than the control treatment on day 8. In particular, the GI of the inoculated thermophilic compost was higher (88.65%) than that of other treatments (GI≤61%) on day 35. The addition of the thermophilic compost promoted the enrichment of Bacillus and Planifilum, accelerated organic matter degradation, and enhanced maturity. Inoculation with mature compost reduced CH4 emissions by 50.66%, owing to the enrichment of methane-oxidizing bacteria (norank_f_Methylococcaceae). Furthermore, the mature compost decreased NH3 emissions by 36.16% through physical absorption and microbial activity (reducing NH4+ production). Inoculation with compost amendment increased N2O emissions owing to the enhanced denitrification of the nitrate reduction function. Overall, thermophilic compost addition enhanced the composting process and improved maturity, whereas mature compost addition was more effective in reducing gaseous emissions during the co-composting of kitchen waste and pig manure.","PeriodicalId":11899,"journal":{"name":"Environmental Technology and Innovation","volume":"49 3-4","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135161345","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Rhamnolipids have been extensively studied for the remediation of soils contaminated with petroleum hydrocarbons. However, the literature on the effects of rhamnolipids on the soil microenvironment is scarce. In this study, we adopted a drip irrigation technique to apply a rhamnolipid solution to soil planted with cotton in a saline desert area. The results showed that the addition of rhamnolipids increased soil organic matter by 5.0–31.6% and reduced soil electrical conductivity by 0.3–42.4%. Additionally, it improved soil nutrient conditions, reshaped the composition and function of the microbial community in the rhizosphere soil, and ultimately promoted cotton growth by 3.3 – 9.0%. Simultaneously, the addition of rhamnolipids enriched the diversity of the bacterial community. Although it reduced the diversity of fungal communities, it optimized the community structure of fungi. It is worth noting that higher concentrations of rhamnolipids may have toxic effects on soil fungi, the mechanism of which is unknown. These findings shed new light on understanding the effects of rhamnolipids on rhizosphere soil microorganisms and provide a new direction for sustainable agricultural production.
{"title":"Intervention of Rhamnolipid Improves the Rhizosphere Microenvironment of Cotton in Desert Saline Lands","authors":"Qing Liu, Chunlei Chen, Youhua Chen, Binchuan Huang, Yuhui Yang, Hao Zhu, Yanhong Li, Xingpeng Wang, Chunfang Zhang","doi":"10.1016/j.eti.2023.103378","DOIUrl":"https://doi.org/10.1016/j.eti.2023.103378","url":null,"abstract":"Rhamnolipids have been extensively studied for the remediation of soils contaminated with petroleum hydrocarbons. However, the literature on the effects of rhamnolipids on the soil microenvironment is scarce. In this study, we adopted a drip irrigation technique to apply a rhamnolipid solution to soil planted with cotton in a saline desert area. The results showed that the addition of rhamnolipids increased soil organic matter by 5.0–31.6% and reduced soil electrical conductivity by 0.3–42.4%. Additionally, it improved soil nutrient conditions, reshaped the composition and function of the microbial community in the rhizosphere soil, and ultimately promoted cotton growth by 3.3 – 9.0%. Simultaneously, the addition of rhamnolipids enriched the diversity of the bacterial community. Although it reduced the diversity of fungal communities, it optimized the community structure of fungi. It is worth noting that higher concentrations of rhamnolipids may have toxic effects on soil fungi, the mechanism of which is unknown. These findings shed new light on understanding the effects of rhamnolipids on rhizosphere soil microorganisms and provide a new direction for sustainable agricultural production.","PeriodicalId":11899,"journal":{"name":"Environmental Technology and Innovation","volume":"51 ","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136372216","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-11-01DOI: 10.1016/j.eti.2023.103375
Malin Bomberg, Hanna Miettinen, Réka Hajdu-Rahkama, Aino-Maija Lakaniemi, Wojciech Anacki, Kajetan Witecki, Jaakko A. Puhakka, Théodore Ineich, Wickus Slabbert, Päivi Kinnunen
Copper is a strategic raw material widely needed for electrification. One possibility to diversify the supply to answer the market demand is to produce copper with in situ technology. In this study, feasibility of in situ bioleaching of copper was tested in a deep subsurface deposit. During in situ bioleaching of copper, copper is leached using a biologically produced ferric iron solution, which is recycled back to the in situ reactor after valuable metals are recovered, after which the solution is re-oxidized by iron-oxidizing microorganisms (IOB). A rock reactor was constructed in the Rudna Mine at ca 1 km depth and the microbiology and hydrogeochemistry of the water circulated through the reactor after blasting for fracturing the rock was monitored over time. The test site was rich in carbonates requiring large quantities of acid to remove the buffering capacity. The bacterial, archaeal and fungal communities in the rock reactor were monitored and characterized by quantitative polymerase chain reaction (qPCR) and amplicon sequencing, and acidophilic, iron oxidizing activity of the microbial communities during operation and pre- and post-operation phases was tested by cultivation. No acidophilic iron oxidizers were detected in the water samples during construction of the pilot reactor. Acidic leaching solution originating from the underground ferric iron generating bioreactor (FIGB) contained acidophilic IOB, which were also viable after the leach liquor was returned from the rock reactor. In the post-operation phase, when the rock reactor was neutralized with CaCO3/Ca(HCO3)2 solution, to inhibit the acidophilic IOB, iron oxidizing microorganisms were still present in the effluent solution one week after termination of the leaching and start of neutralization. Therefore, the post-operation phase needs further attention to completely stop the activity of added microorganisms. Copper was abundantly leached during the acid wash and leaching phases, proving the concept of deep in situ bioleaching.
{"title":"Indirect in situ Bioleaching is an Emerging Tool for Accessing Deeply Buried Metal Reserves, But Can the Process be Managed? – A Case Study of Copper Leaching at 1km Depth","authors":"Malin Bomberg, Hanna Miettinen, Réka Hajdu-Rahkama, Aino-Maija Lakaniemi, Wojciech Anacki, Kajetan Witecki, Jaakko A. Puhakka, Théodore Ineich, Wickus Slabbert, Päivi Kinnunen","doi":"10.1016/j.eti.2023.103375","DOIUrl":"https://doi.org/10.1016/j.eti.2023.103375","url":null,"abstract":"Copper is a strategic raw material widely needed for electrification. One possibility to diversify the supply to answer the market demand is to produce copper with in situ technology. In this study, feasibility of in situ bioleaching of copper was tested in a deep subsurface deposit. During in situ bioleaching of copper, copper is leached using a biologically produced ferric iron solution, which is recycled back to the in situ reactor after valuable metals are recovered, after which the solution is re-oxidized by iron-oxidizing microorganisms (IOB). A rock reactor was constructed in the Rudna Mine at ca 1 km depth and the microbiology and hydrogeochemistry of the water circulated through the reactor after blasting for fracturing the rock was monitored over time. The test site was rich in carbonates requiring large quantities of acid to remove the buffering capacity. The bacterial, archaeal and fungal communities in the rock reactor were monitored and characterized by quantitative polymerase chain reaction (qPCR) and amplicon sequencing, and acidophilic, iron oxidizing activity of the microbial communities during operation and pre- and post-operation phases was tested by cultivation. No acidophilic iron oxidizers were detected in the water samples during construction of the pilot reactor. Acidic leaching solution originating from the underground ferric iron generating bioreactor (FIGB) contained acidophilic IOB, which were also viable after the leach liquor was returned from the rock reactor. In the post-operation phase, when the rock reactor was neutralized with CaCO3/Ca(HCO3)2 solution, to inhibit the acidophilic IOB, iron oxidizing microorganisms were still present in the effluent solution one week after termination of the leaching and start of neutralization. Therefore, the post-operation phase needs further attention to completely stop the activity of added microorganisms. Copper was abundantly leached during the acid wash and leaching phases, proving the concept of deep in situ bioleaching.","PeriodicalId":11899,"journal":{"name":"Environmental Technology and Innovation","volume":"39 11","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136372218","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Biofilm is crucial in implementing integrated fixed-film activated sludge (IFAS) systems. However, current carriers face challenges in long-term stable operations. This study proposes using cationic polyacrylamide (PAM) as a positive-charged addictive and surface abrasion to modify polypropylene (PP) pipes to enhance biofilm growth and maintain long-time operation in IFAS applications. The modified PP carriers have significantly increased specific surface area compared to unmodified ones. The growth of biofilm on modified carriers is as much as over four times due to the improved biocompatibility of the material. The follow-up aerobic IFAS process achieves over 40% total nitrogen (TN) removal through simultaneous nitrification and denitrification with no specific anoxic stages or reactors. The sludge settling performance of the system is also improved with a stable 30-min sludge settling ratio of 18%. The maximum specific denitrification rate of the detached biofilm is 17.82 mg NO3−-N/g MLVSS/h, which is 33% higher than the pure activated sludge system. The high-throughput sequencing analysis results reveal that the abundance of biofilm-formation beneficial microbes increased from 0.02% to 16.47%.
{"title":"Enhancing biofilm growth in an integrated fixed-film activated sludge process through modification of polypropylene carriers","authors":"Shujie Liu, Yun Li, Jinghou Wang, Fuming Chen, Jian-e Zuo","doi":"10.1016/j.eti.2023.103353","DOIUrl":"https://doi.org/10.1016/j.eti.2023.103353","url":null,"abstract":"Biofilm is crucial in implementing integrated fixed-film activated sludge (IFAS) systems. However, current carriers face challenges in long-term stable operations. This study proposes using cationic polyacrylamide (PAM) as a positive-charged addictive and surface abrasion to modify polypropylene (PP) pipes to enhance biofilm growth and maintain long-time operation in IFAS applications. The modified PP carriers have significantly increased specific surface area compared to unmodified ones. The growth of biofilm on modified carriers is as much as over four times due to the improved biocompatibility of the material. The follow-up aerobic IFAS process achieves over 40% total nitrogen (TN) removal through simultaneous nitrification and denitrification with no specific anoxic stages or reactors. The sludge settling performance of the system is also improved with a stable 30-min sludge settling ratio of 18%. The maximum specific denitrification rate of the detached biofilm is 17.82 mg NO3−-N/g MLVSS/h, which is 33% higher than the pure activated sludge system. The high-throughput sequencing analysis results reveal that the abundance of biofilm-formation beneficial microbes increased from 0.02% to 16.47%.","PeriodicalId":11899,"journal":{"name":"Environmental Technology and Innovation","volume":"276 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134903019","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Dissolved organic matter (DOM) in municipal wastewater can have a detrimental effect on aquatic ecosystems, as DOM can participate in the global carbon cycle and change the transport of other pollutants. The characteristics of DOM can also affect the utilization efficiency of dissolved organic carbon by microorganisms in water. In this study, variations in DOM quantity and quality in a full-scale wastewater treatment plant (WWTP) coupled with a hybrid constructed wetland (CW) system during cold periods were characterized by using excitation-emission matrix spectroscopy combined with parallel factor analysis (EEM-PARAFAC). The results showed that the DOM concentration significantly decreased after exiting the WWTP, while a slight increase was found in the CW. The coupled system could significantly eliminate influent DOM with a removal efficiency of 92.1%. The CW system could still remove DOM even in winter. Five fluorescent components, including three humic-like components, one protein-like component and one tyrosine-like component, were identified. Although the biological treatment process in the WWTP contributed a large number of protein-like substances, the optical indices showed that the bioavailability of wastewater was gradually reduced, indicating that DOM was selectively removed by the integrated system. Moreover, there were significant correlations between water quality parameters and DOM indices. This study could contribute to a better understanding of the elimination process of dissolved organic carbon in coupled systems of WWTPs and CWs and offer novel ideas for organic carbon resource recovery and water quality monitoring in watershed environments.
{"title":"Fluorescence spectroscopic characterization of dissolved organic matter in the wastewater treatment plant and hybrid constructed wetlands coupling system in winter: A case study in eastern China","authors":"Peihao Yan, Shiyuan Wei, Yandong Chen, Qiang Ning, Zhen Hu, Zizhang Guo, Huijun Xie, Haiming Wu, Jian Zhang","doi":"10.1016/j.eti.2023.103399","DOIUrl":"https://doi.org/10.1016/j.eti.2023.103399","url":null,"abstract":"Dissolved organic matter (DOM) in municipal wastewater can have a detrimental effect on aquatic ecosystems, as DOM can participate in the global carbon cycle and change the transport of other pollutants. The characteristics of DOM can also affect the utilization efficiency of dissolved organic carbon by microorganisms in water. In this study, variations in DOM quantity and quality in a full-scale wastewater treatment plant (WWTP) coupled with a hybrid constructed wetland (CW) system during cold periods were characterized by using excitation-emission matrix spectroscopy combined with parallel factor analysis (EEM-PARAFAC). The results showed that the DOM concentration significantly decreased after exiting the WWTP, while a slight increase was found in the CW. The coupled system could significantly eliminate influent DOM with a removal efficiency of 92.1%. The CW system could still remove DOM even in winter. Five fluorescent components, including three humic-like components, one protein-like component and one tyrosine-like component, were identified. Although the biological treatment process in the WWTP contributed a large number of protein-like substances, the optical indices showed that the bioavailability of wastewater was gradually reduced, indicating that DOM was selectively removed by the integrated system. Moreover, there were significant correlations between water quality parameters and DOM indices. This study could contribute to a better understanding of the elimination process of dissolved organic carbon in coupled systems of WWTPs and CWs and offer novel ideas for organic carbon resource recovery and water quality monitoring in watershed environments.","PeriodicalId":11899,"journal":{"name":"Environmental Technology and Innovation","volume":"59 ","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135062399","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-11-01DOI: 10.1016/j.eti.2023.103423
Haeseong Oh, Ka-Young Jung, Bo Young Kim, Byung Joon Lee, Hyun-Sang Shin, Jin Hur
In this study, we characterized the optical and molecular weight (MW) properties of dissolved organic matter (DOM) with various sources in an agriculture-forestry watershed. We proposed a guideline to identify optimum DOM source tracers for downstream rivers during both rain and non-rain events, utilizing the load of dissolved organic carbon (DOC) from point sources. Six descriptors were pre-selected based on established criteria in the literature, and fifteen pairs of these descriptors were evaluated for their applicability in end-member mixing analysis (EMMA). The results from EMMA provided inconsistent estimates of relative contributions from DOM sources across the fifteen pairs, with optical descriptors outperforming MW-based descriptors and their combinations. The optimal source tracers were determined by comparing relative contributions of DOM from upstream effluent wastewater using DOC load ratios calculated from on-site monitoring data and predictions based on EMMA. The pair of optical descriptors, HIX (humification index) and BIX (biological index), closely matched the measured load ratios with minimal discrepancies (0.4 ± 0.4%). According to the EMMA results using pairs of HIX and BIX, non-rain events were primarily influenced by oil-cake fertilizer and treated effluent wastewater, while rain event samples were dominated by manure and soils. These findings offer insights into managing non-point organic pollution sources in agricultural-forestry watersheds, contributing to our understanding of carbon and nutrient cycling in aquatic systems. Notably, this study proposes a validation guideline that employs load ratios of point sources, such as effluent wastewater, to enhance source tracking accuracy.
{"title":"Optimal Tracer Identification for Dissolved Organic Matter (DOM) Source Tracking in Watersheds Using Point Source Effluent Load Data","authors":"Haeseong Oh, Ka-Young Jung, Bo Young Kim, Byung Joon Lee, Hyun-Sang Shin, Jin Hur","doi":"10.1016/j.eti.2023.103423","DOIUrl":"https://doi.org/10.1016/j.eti.2023.103423","url":null,"abstract":"In this study, we characterized the optical and molecular weight (MW) properties of dissolved organic matter (DOM) with various sources in an agriculture-forestry watershed. We proposed a guideline to identify optimum DOM source tracers for downstream rivers during both rain and non-rain events, utilizing the load of dissolved organic carbon (DOC) from point sources. Six descriptors were pre-selected based on established criteria in the literature, and fifteen pairs of these descriptors were evaluated for their applicability in end-member mixing analysis (EMMA). The results from EMMA provided inconsistent estimates of relative contributions from DOM sources across the fifteen pairs, with optical descriptors outperforming MW-based descriptors and their combinations. The optimal source tracers were determined by comparing relative contributions of DOM from upstream effluent wastewater using DOC load ratios calculated from on-site monitoring data and predictions based on EMMA. The pair of optical descriptors, HIX (humification index) and BIX (biological index), closely matched the measured load ratios with minimal discrepancies (0.4 ± 0.4%). According to the EMMA results using pairs of HIX and BIX, non-rain events were primarily influenced by oil-cake fertilizer and treated effluent wastewater, while rain event samples were dominated by manure and soils. These findings offer insights into managing non-point organic pollution sources in agricultural-forestry watersheds, contributing to our understanding of carbon and nutrient cycling in aquatic systems. Notably, this study proposes a validation guideline that employs load ratios of point sources, such as effluent wastewater, to enhance source tracking accuracy.","PeriodicalId":11899,"journal":{"name":"Environmental Technology and Innovation","volume":"64 8-9","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135161455","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-11-01DOI: 10.1016/j.eti.2023.103419
Adedapo O. Adeola, Mingshan Cui, Rafik Naccache
Sustainable development goals have emphasized the need to focus on water treatment to mitigate the ever-rising demands for clean water. High costs and energy requirements have been the Achilles’ heel of most treatment technologies. Herein, we develop cheap lignin-derived sorbents prepared by microwave (MW) and acid precipitation (AP) treatments of raw lignin (RL) for Rhodamine-B (RhB) adsorption in aqueous solution. Our findings evidence micro- and mesoporous structures, with irregular grain size. X-ray diffraction revealed an amorphous material, while Fourier-transform infrared analysis points to the presence of carboxyl, hydroxyl and sulfite functional groups, which may facilitate the adsorption of the dye. Adsorption isotherm and kinetic data describe complex and pore-driven interactions, based on the Sips, D-R and intraparticle diffusion models, considering the sum of squared error values obtained from nonlinear regression analysis. Adsorption efficiency of ∼97% is obtainable at optimal conditions for treated lignin (3 g/L sorbent dose, 720 min contact time and under acidic pH conditions). Thermodynamic studies revealed that RL-RhB and MW-RhB are driven by physisorption considering ∆H° values, while stronger interactions occurred for AP-RhB, considering the high enthalpy (∼49 kJ/mol) and adsorption capacity (∼2766 mg/g). Van der Waals attraction, π-π stacking, and pore-filling mechanisms are among the several interactions that may occur between RhB and the sorbents. Our findings offer a way to valorize lignin as an alternative pathway to economically viable and sustainable water purification.
可持续发展目标强调需要把重点放在水处理上，以减轻对清洁水日益增长的需求。高成本和能源需求一直是大多数处理技术的致命弱点。在此，我们开发了廉价的木质素源吸附剂，通过微波(MW)和酸沉淀(AP)处理原料木质素(RL)，制备用于吸附罗丹明- b (RhB)的水溶液。我们的发现证明了微孔和介孔结构，具有不规则的粒度。x射线衍射显示为无定形物质，而傅里叶变换红外分析指出存在羧基，羟基和亚硫酸盐官能团，这可能有助于染料的吸附。基于Sips、D-R和颗粒内扩散模型，考虑非线性回归分析得到的误差平方和，吸附等温线和动力学数据描述了复杂的孔隙驱动相互作用。在处理木质素的最佳条件下(3 g/L吸附剂剂量、720 min接触时间和酸性pH条件下)，吸附效率可达97%。热力学研究表明，考虑到∆H°值，RL-RhB和MW-RhB受物理吸附驱动，而AP-RhB考虑到高焓(~ 49 kJ/mol)和高吸附量(~ 2766 mg/g)，相互作用更强。范德华吸引、π-π堆积和孔隙填充机制是RhB和吸附剂之间可能发生的几种相互作用。我们的研究结果为木质素作为经济上可行和可持续的水净化的替代途径提供了一种方法。
{"title":"Rhodamine B sequestration using acid-precipitated and microwave-treated softwood lignin: Comparative isotherm, kinetics and thermodynamic studies","authors":"Adedapo O. Adeola, Mingshan Cui, Rafik Naccache","doi":"10.1016/j.eti.2023.103419","DOIUrl":"https://doi.org/10.1016/j.eti.2023.103419","url":null,"abstract":"Sustainable development goals have emphasized the need to focus on water treatment to mitigate the ever-rising demands for clean water. High costs and energy requirements have been the Achilles’ heel of most treatment technologies. Herein, we develop cheap lignin-derived sorbents prepared by microwave (MW) and acid precipitation (AP) treatments of raw lignin (RL) for Rhodamine-B (RhB) adsorption in aqueous solution. Our findings evidence micro- and mesoporous structures, with irregular grain size. X-ray diffraction revealed an amorphous material, while Fourier-transform infrared analysis points to the presence of carboxyl, hydroxyl and sulfite functional groups, which may facilitate the adsorption of the dye. Adsorption isotherm and kinetic data describe complex and pore-driven interactions, based on the Sips, D-R and intraparticle diffusion models, considering the sum of squared error values obtained from nonlinear regression analysis. Adsorption efficiency of ∼97% is obtainable at optimal conditions for treated lignin (3 g/L sorbent dose, 720 min contact time and under acidic pH conditions). Thermodynamic studies revealed that RL-RhB and MW-RhB are driven by physisorption considering ∆H° values, while stronger interactions occurred for AP-RhB, considering the high enthalpy (∼49 kJ/mol) and adsorption capacity (∼2766 mg/g). Van der Waals attraction, π-π stacking, and pore-filling mechanisms are among the several interactions that may occur between RhB and the sorbents. Our findings offer a way to valorize lignin as an alternative pathway to economically viable and sustainable water purification.","PeriodicalId":11899,"journal":{"name":"Environmental Technology and Innovation","volume":"42 6","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135161581","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-11-01DOI: 10.1016/j.eti.2023.103422
Rui Wang, Shuying Zhang, Jiayue Xue, Li Guo, Lingyu Li
{"title":"Speciated VOCs emissions and ozone formation potential from on-road vehicles in North China Plain based on detailed and localized source profiles","authors":"Rui Wang, Shuying Zhang, Jiayue Xue, Li Guo, Lingyu Li","doi":"10.1016/j.eti.2023.103422","DOIUrl":"https://doi.org/10.1016/j.eti.2023.103422","url":null,"abstract":"","PeriodicalId":11899,"journal":{"name":"Environmental Technology and Innovation","volume":"74 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135216184","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-11-01DOI: 10.1016/j.eti.2023.103426
Parvin Berenjkar, Richard Sparling, Stan Lozecznik, Qiuyan Yuan
{"title":"The Interactive Effect of Environmental Factors on Methane Oxidation in A Continental Landfill Bio-cover","authors":"Parvin Berenjkar, Richard Sparling, Stan Lozecznik, Qiuyan Yuan","doi":"10.1016/j.eti.2023.103426","DOIUrl":"https://doi.org/10.1016/j.eti.2023.103426","url":null,"abstract":"","PeriodicalId":11899,"journal":{"name":"Environmental Technology and Innovation","volume":"426 2","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135327658","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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