Journal of environmental sciences最新文献_第9页

Sustainable management of campus fallen leaves through low-temperature pyrolysis and application in Pb immobilization 低温热解对校园落叶的可持续管理及其在Pb固定化中的应用

IF 6.9

Journal of environmental sciences Pub Date : 2023-06-07 DOI: 10.1016/j.jes.2023.05.043

Rongli Tan , Ke Li , Yue Sun , Xiaoliang Fan , Zhengtao Shen , Lingyi Tang

{"title":"Sustainable management of campus fallen leaves through low-temperature pyrolysis and application in Pb immobilization","authors":"Rongli Tan , Ke Li , Yue Sun , Xiaoliang Fan , Zhengtao Shen , Lingyi Tang","doi":"10.1016/j.jes.2023.05.043","DOIUrl":"https://doi.org/10.1016/j.jes.2023.05.043","url":null,"abstract":"<div><p>Realizing campus sustainability requires the environmental-friendly and economical treatment of tremendous fallen leaves. Producing fallen leaf biochar at a low temperature is a candidate approach. In this study, six common types of fallen leaves on the campus were pyrolyzed at 300 °C. The obtained biochars were characterized and the adsorption mechanisms of lead (Pb) by the fallen leaf biochars were investigated. The adsorption capacity of leaf biochar for Pb was relatively high, up to 209 mg/g (<em>Yulania denudata</em> leaf biochar). Adsorption of Pb onto active sites was the rate-limiting step for most leaf biochars. But for <em>Platanus</em> leaf biochar, intraparticle diffusion of Pb<sup>2+</sup> dominated owing to the lowest adsorption capacity. However, the highest exchangeable Pb fraction (27%) indicated its potential for removing aqueous Pb<sup>2+</sup>. <em>Ginkgo</em> and <em>Prunus cerasifera</em> leaf biochar immobilized Pb by surface complexation and precipitation as lead oxalate. Hence, they were suitable for soil heavy metal remediation. This study shed the light on the sustainable utilization of campus fallen leaves and the application of fallen leaf biochars in heavy metal remediation.</p></div>","PeriodicalId":15774,"journal":{"name":"Journal of environmental sciences","volume":"139 ","pages":"Pages 281-292"},"PeriodicalIF":6.9,"publicationDate":"2023-06-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49746419","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}

引用次数: 0

Artificial intelligence optimization and controllable slow-release iron sulfide realizes efficient separation of copper and arsenic in strongly acidic wastewater 人工智能优化和可控缓释硫化铁实现了强酸性废水中铜砷的高效分离

IF 6.9

Journal of environmental sciences Pub Date : 2023-06-07 DOI: 10.1016/j.jes.2023.05.038

Xingfei Zhang , Chenglong Lu , Jia Tian , Liqiang Zeng , Yufeng Wang , Wei Sun , Haisheng Han , Jianhua Kang

{"title":"Artificial intelligence optimization and controllable slow-release iron sulfide realizes efficient separation of copper and arsenic in strongly acidic wastewater","authors":"Xingfei Zhang , Chenglong Lu , Jia Tian , Liqiang Zeng , Yufeng Wang , Wei Sun , Haisheng Han , Jianhua Kang","doi":"10.1016/j.jes.2023.05.038","DOIUrl":"https://doi.org/10.1016/j.jes.2023.05.038","url":null,"abstract":"<div><p>Iron sulfide (FeS) is a promising material for separating copper and arsenic from strongly acidic wastewater due to its S<sup>2−</sup> slow-release effect. However, uncertainties arise because of the constant changes in wastewater composition, affecting the selection of operating parameters and FeS types. In this study, the aging method was first used to prepare various controllable FeS nanoparticles to weaken the arsenic removal ability without affecting the copper removal. Orthogonal experiments were conducted, and the results identified the Cu/As ratio, H<sub>2</sub>SO<sub>4</sub> concentration, and FeS dosage as the three main factors influencing the separation efficiency. The backpropagation artificial neural network (BP-ANN) model was established to determine the relationship between the influencing factors and the separation efficiency. The correlation coefficient (R) of overall model was 0.9923 after optimizing using genetic algorithm (GA). The BP-GA model was also solved using GA under specific constraints, predicting the best solution for the separation process in real-time. The predicted results show that the high temperature and long aging time of FeS were necessary to gain high separation efficiency, and the maximum separation factor can reached 1,400. This study provides a suitable sulfurizing material and a set of methods and models with robust flexibility that can successfully predict the separation efficiency of copper and arsenic from highly acidic environments.</p></div>","PeriodicalId":15774,"journal":{"name":"Journal of environmental sciences","volume":"139 ","pages":"Pages 293-307"},"PeriodicalIF":6.9,"publicationDate":"2023-06-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49757711","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}

引用次数: 0

Dissolved organic matter accelerates microbial degradation of 17 alpha-ethinylestradiol in the presence of iron mineral 在铁矿物存在的情况下，溶解的有机物加速了17 α -炔雌醇的微生物降解

IF 6.9

Journal of environmental sciences Pub Date : 2023-06-07 DOI: 10.1016/j.jes.2023.05.042

Huan He , Min Shi , Xiaoxia Yang , Juhong Zhan , Yanting Lin , Ziwei Guo , Zhicheng Liao , Chaochao Lai , Xiaomin Ren , Bin Huang , Xuejun Pan

{"title":"Dissolved organic matter accelerates microbial degradation of 17 alpha-ethinylestradiol in the presence of iron mineral","authors":"Huan He , Min Shi , Xiaoxia Yang , Juhong Zhan , Yanting Lin , Ziwei Guo , Zhicheng Liao , Chaochao Lai , Xiaomin Ren , Bin Huang , Xuejun Pan","doi":"10.1016/j.jes.2023.05.042","DOIUrl":"https://doi.org/10.1016/j.jes.2023.05.042","url":null,"abstract":"<div><p>Dissolved organic matter (DOM) and iron minerals widely existing in the natural aquatic environment can mediate the migration and transformation of organic pollutants. However, the mechanism of interaction between DOM and iron minerals in the microbial degradation of pollutants deserves further investigation. In this study, the mechanism of 17 alpha-ethinylestradiol (EE2) biodegradation mediated by humic acid (HA) and three kinds of iron minerals (goethite, magnetite, and pyrite) was investigated. The results found that HA and iron minerals significantly accelerated the biodegradation process of EE2, and the highest degradation efficiency of EE2 (48%) was observed in the HA-mediated microbial system with pyrite under aerobic conditions. Furthermore, it had been demonstrated that hydroxyl radicals (HO•) was the main active substance responsible for the microbial degradation of EE2. HO• is primarily generated through the reaction between hydrogen peroxide secreted by microorganisms and Fe(II), with aerobic conditions being more conducive. The presence of iron minerals and HA could change the microbial communities in the EE2 biodegradation system. These findings provide new information for exploring the migration and transformation of pollutants by microorganisms in iron-rich environments.</p></div>","PeriodicalId":15774,"journal":{"name":"Journal of environmental sciences","volume":"139 ","pages":"Pages 364-376"},"PeriodicalIF":6.9,"publicationDate":"2023-06-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49757715","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}

引用次数: 0

Mechanistic insight into Cr(VI) retention by Si-containing ferrihydrite 含硅水合铁对Cr(VI)截留的机理研究

IF 6.9

Journal of environmental sciences Pub Date : 2023-06-03 DOI: 10.1016/j.jes.2023.05.040

Ying Hu , Qiang Xue , Honghan Chen , Huaming Guo , Kenneth C. Carroll , Song Wang

{"title":"Mechanistic insight into Cr(VI) retention by Si-containing ferrihydrite","authors":"Ying Hu , Qiang Xue , Honghan Chen , Huaming Guo , Kenneth C. Carroll , Song Wang","doi":"10.1016/j.jes.2023.05.040","DOIUrl":"https://doi.org/10.1016/j.jes.2023.05.040","url":null,"abstract":"<div><p>Hexavalent chromium [Cr(VI)] causes serious harm to the environment due to its high toxicity, solubility, and mobility. Ferrihydrites (Fh) are the main adsorbent and trapping agent of Cr(VI) in soils and aquifers, and they usually coexist with silicate (Si), forming Si-containing ferrihydrite (Si-Fh) mixtures. However, the mechanism of Cr(VI) retention by Si-Fh mixtures is poorly understood. In this study, the behaviors and mechanisms of Cr(VI) adsorption onto Si-Fh with different Si/Fe molar ratios was investigated. Transmission electron microscope, Fourier transform infrared spectroscopy, X-ray diffraction, X-ray photoelectron spectroscopy, and other techniques were used to characterize Si-Fh and Cr(VI)-loading of Si-Fh. The results show that specific surface area of Si-Fh increases gradually with increasing Si/Fe ratios, but Cr(VI) adsorption on Si-Fh decreases with increasing Si/Fe ratios. This is because with an increase in Si/Fe molar ratio, the point of zero charge of Si-Fh gradually decreases and electrostatic repulsion between Si-Fh and Cr(VI) increases. However, the complexation of Cr(VI) is enhanced due to the increase in adsorbed hydroxyl (A-OH-) on Si-Fh with increasing Si/Fe molar ratio, which partly counteracts the effect of the electrostatic repulsion. Overall, the increase in the electrostatic repulsion has a greater impact on adsorption than the additional complexation with Si-Fh. Density functional theory calculation further supports this observation, showing the increases in electron variation of bonding atoms and reaction energies of inner spherical complexes with the increase in Si/Fe ratio.</p></div>","PeriodicalId":15774,"journal":{"name":"Journal of environmental sciences","volume":"139 ","pages":"Pages 217-225"},"PeriodicalIF":6.9,"publicationDate":"2023-06-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49746556","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}

引用次数: 2

Performance and mechanism of La-Fe metal-organic framework as a highly efficient adsorbent for fluoride removal from mine water La-Fe金属有机骨架高效吸附剂对矿井水中氟化物的吸附性能及机理研究

IF 6.9

Journal of environmental sciences Pub Date : 2023-06-03 DOI: 10.1016/j.jes.2023.05.039

Chaomin Jia , Jianbing Wang , Huijiao Wang , Sichao Zhu , Xiaohui Zhang , Yuxiang Wang

{"title":"Performance and mechanism of La-Fe metal-organic framework as a highly efficient adsorbent for fluoride removal from mine water","authors":"Chaomin Jia , Jianbing Wang , Huijiao Wang , Sichao Zhu , Xiaohui Zhang , Yuxiang Wang","doi":"10.1016/j.jes.2023.05.039","DOIUrl":"https://doi.org/10.1016/j.jes.2023.05.039","url":null,"abstract":"<div><p>Water fluoride pollution has caused non-negligible harm to the environment and humans, and thus it is crucial to find a suitable treatment technology. In this study, La-Fe@PTA adsorbent was synthesized for the defluoridation of mine water. The results showed that the optimum conditions for defluoridation by La-Fe@PTA were pH close to 7.0, the initial F<sup>−</sup> concentration of 10 mg/L, the dosage of 0.5 g/L and the adsorption time of 240 min. Compared with SO<sub>4</sub><sup>2‒</sup>, Cl<sup>‒</sup>, NO<sub>3</sub><sup>‒</sup>, Ca<sup>2+</sup> and Mg<sup>2+</sup>, CO<sub>3</sub><sup>2‒</sup> and HCO<sub>3</sub><sup>‒</sup> presented severer inhibition on fluoride uptake by La-Fe@PTA. The adsorption process fits well with the pseudo-second-order kinetic model and Freundlich model, and the maximum adsorption capacity of Langmuir model was 95 mg/g. Fixed-bed adsorption results indicated that fluoride in practical fluorinated mine water could be effectively removed from 3.6 mg/L to less than 1.5 mg/L within 130 bed volume (BV) by using 1.5 g La-Fe@PTA. Furthermore, the adsorbent still had good adsorption capacity after regeneration, which confirms the great application potential of La-Fe@PTA as a fluoride ion adsorbent. The mechanism analysis showed that La-Fe@PTA adsorption of fluorine ions is a physicochemical reaction driven by electrostatic attraction and ion exchange.</p></div>","PeriodicalId":15774,"journal":{"name":"Journal of environmental sciences","volume":"139 ","pages":"Pages 245-257"},"PeriodicalIF":6.9,"publicationDate":"2023-06-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49745975","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}

引用次数: 1

The fate of antibiotic resistance genes in the coastal lagoon with multiple functional zones 多功能区滨海泻湖中抗生素耐药基因的命运

IF 6.9

Journal of environmental sciences Pub Date : 2023-06-01 DOI: 10.1016/j.jes.2022.07.021

Shisheng Li , Hui Gao , Haibo Zhang , Guangke Wei , Qin Shu , Ruijing Li , Shuaichen Jin , Guangshui Na , Yali Shi

{"title":"The fate of antibiotic resistance genes in the coastal lagoon with multiple functional zones","authors":"Shisheng Li , Hui Gao , Haibo Zhang , Guangke Wei , Qin Shu , Ruijing Li , Shuaichen Jin , Guangshui Na , Yali Shi","doi":"10.1016/j.jes.2022.07.021","DOIUrl":"10.1016/j.jes.2022.07.021","url":null,"abstract":"<div><p><span>Coastal lagoons provide many important services to human society, but their year-round use for aquaculture introduces large amounts of sewage. The contamination of antibiotic resistance genes (ARGs) is therefore of great concern. In this study, 50 ARGs subtypes, two integrase genes (intl1, intl2), and 16S rRNA genes were detected by high-throughput quantitative PCR, and standard curves of all target genes were prepared for quantification. The occurrence and distribution of ARGs in a typical coastal lagoon (XinCun lagoon, China) were comprehensively explored. We detected 44 and 38 subtypes of ARGs in the water and sediment, respectively, and discuss the various factors influencing the fate of ARGs in the coastal lagoon. Macrolides-lincosamides-streptogramins B was the primary ARG type, and macB was the predominant subtype. Antibiotic efflux and antibiotic inactivation were the main ARG resistance mechanisms. The XinCun lagoon was divided into eight functional zones. The ARGs showed a distinct spatial distribution owing to the influence of microbial biomass and anthropogenic activity in different functional zones. Fishing rafts, abandoned fish ponds, the town sewage zone, and mangrove wetlands provided a large quantity of ARGs to the XinCun lagoon. Nutrients and heavy metals also significantly correlated with the fate of the ARGs, especially NO</span><sub>2</sub><sup>−</sup>-N and Cu, which cannot be ignored. It is noteworthy that lagoon-barrier systems coupled with persistent pollutant inputs result in coastal lagoons acting as a “buffer pool” for ARGs, which can then accumulate and threaten the offshore environment.</p></div>","PeriodicalId":15774,"journal":{"name":"Journal of environmental sciences","volume":"128 ","pages":"Pages 93-106"},"PeriodicalIF":6.9,"publicationDate":"2023-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"10754746","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}

引用次数: 4

Removal of saxitoxin and anatoxin-a by PAC in the presence and absence of microcystin-LR and/or cyanobacterial cells 在微囊藻毒素- lr和/或蓝藻细胞存在或不存在的情况下，PAC去除蛤蚌毒素和anatoxin-a

IF 6.9

Journal of environmental sciences Pub Date : 2023-06-01 DOI: 10.1016/j.jes.2022.08.015

Justin Rorar, Laura Davila Garcia, Teresa Cutright

{"title":"Removal of saxitoxin and anatoxin-a by PAC in the presence and absence of microcystin-LR and/or cyanobacterial cells","authors":"Justin Rorar, Laura Davila Garcia, Teresa Cutright","doi":"10.1016/j.jes.2022.08.015","DOIUrl":"10.1016/j.jes.2022.08.015","url":null,"abstract":"<div><p>Cyanobacteria can produce cyanotoxins such as microcystin-LR (MC), saxitoxin (STX), and anatoxin-a (ANTX-a) which are harmful to humans and other animals. Individual removal efficiencies of STX and ANTX-a by powdered activated carbon (PAC) was investigated, as well as when MC-LR and cyanobacteria were present. Experiments were conducted with distilled water and then source water, using the PAC dosages, rapid mix/flocculation mixing intensities and contact times of two drinking water treatment plants in northeast Ohio. At pH 8 and 9, STX removal was 47%-81% in distilled water and 46%-79% in source water, whereas it was 0-28% for pH 6 in distilled water and 31%-52% in source water. When 1.6 µg/L or 20 µg/L MC-LR was present with STX, STX removal was increased with PAC simultaneously removing 45%-65% of the 1.6 µg/L MC-LR and 25%-95% of the 20 µg/L MC-LR depending on the pH. ANTX-a removal at pH 6 was 29%-37% for distilled water and 80% for source water, whereas it was 10%-26% for pH 8 in distilled water and 28% for pH 9 in source water. The presence of cyanobacteria cells decreased ANTX-a removal by at least 18%. When 20 µg/L MC-LR was present with ANTX-a in source water, 59%-73% ANTX-a and 48%-77% of MC-LR was removed at pH 9 depending on the PAC dose. In general, a higher PAC dose led to higher cyanotoxin removals. This study also documented that multiple cyanotoxins can be effectively removed by PAC for water at pH's between 6 and 9.</p></div>","PeriodicalId":15774,"journal":{"name":"Journal of environmental sciences","volume":"128 ","pages":"Pages 161-170"},"PeriodicalIF":6.9,"publicationDate":"2023-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"10757923","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}

引用次数: 4

Facile fabrication of Fe/Zr binary MOFs for arsenic removal in water: High capacity, fast kinetics and good reusability 简便制备Fe/Zr二元mof去除水中砷:容量大、动力学快、可重复使用

IF 6.9

Journal of environmental sciences Pub Date : 2023-06-01 DOI: 10.1016/j.jes.2022.08.002

Qi Guo , Yuan Li , Li-Wei Zheng , Xiao-Yang Wei , Yan Xu , Yi-Wen Shen , Ke-Gang Zhang , Chun-Gang Yuan

{"title":"Facile fabrication of Fe/Zr binary MOFs for arsenic removal in water: High capacity, fast kinetics and good reusability","authors":"Qi Guo , Yuan Li , Li-Wei Zheng , Xiao-Yang Wei , Yan Xu , Yi-Wen Shen , Ke-Gang Zhang , Chun-Gang Yuan","doi":"10.1016/j.jes.2022.08.002","DOIUrl":"10.1016/j.jes.2022.08.002","url":null,"abstract":"<div><p><span>A water-stable bimetallic Fe/Zr metal-organic framework [UiO-66(Fe/Zr)] for exceptional decontamination of arsenic in water was fabricated through a facile one-step strategy. The batch adsorption experiments revealed the excellent performances with ultrafast adsorption kinetics due to the synergistic effects of two functional centers and large surface area (498.33 m</span><sup>2</sup><span><span><span>/g). The absorption capacity of UiO-66(Fe/Zr) for arsenate [As(V)] and arsenite [As(III)] reached as high as 204.1 mg/g and 101.7 mg/g, respectively. Langmuir model was suitable to describe the adsorption behaviors of arsenic on UiO-66(Fe/Zr). The fast kinetics (adsorption equilibrium in 30 min, 10 mg/L As) and pseudo-second-order model implied the strong </span>chemisorption<span> between arsenic ions and UiO-66(Fe/Zr), which was further confirmed by DFT<span> theoretical calculations. The results of FT-IR, XPS analysis and TCLP test demonstrated that arsenic was immobilized on the surface of UiO-66(Fe/Zr) through Fe/Zr-O-As bonds, and the leaching rates of the adsorbed As(III) and As(V) from the spent adsorbent were only 5.6% and 1.4%, respectively. UiO-66(Fe/Zr) can be regenerated for five cycles without obvious removal efficiency decrease. The original arsenic (1.0 mg/L) in lake and </span></span></span>tap water was effectively removed in 2.0 hr [99.0% of As(III) and 99.8% of As(V)]. The bimetallic UiO-66(Fe/Zr) has great potentials in water deep purification of arsenic with fast kinetics and high capacity.</span></p></div>","PeriodicalId":15774,"journal":{"name":"Journal of environmental sciences","volume":"128 ","pages":"Pages 213-223"},"PeriodicalIF":6.9,"publicationDate":"2023-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"10763492","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}

引用次数: 9

Chlorine substitution-dependent toxicities of polychlorinated biphenyls to the earthworm Eisenia fetida in soil 土壤中多氯联苯对蚯蚓的氯取代依赖性毒性

IF 6.9

Journal of environmental sciences Pub Date : 2023-06-01 DOI: 10.1016/j.jes.2022.07.032

Jianying Zhang , Mengyang He , Yaoxuan Liu , Lei Zhang , Haojie Jiang , Daohui Lin

{"title":"Chlorine substitution-dependent toxicities of polychlorinated biphenyls to the earthworm Eisenia fetida in soil","authors":"Jianying Zhang , Mengyang He , Yaoxuan Liu , Lei Zhang , Haojie Jiang , Daohui Lin","doi":"10.1016/j.jes.2022.07.032","DOIUrl":"10.1016/j.jes.2022.07.032","url":null,"abstract":"<div><p>Polychlorinated biphenyls (PCBs) with different chlorine substitution patterns often coexist in e-waste-processing sites. However, the single and combined toxicity of PCBs to soil organisms and the influence of chlorine substitution patterns remain largely unknown. Herein, we evaluated the distinct <em>in vivo</em> toxicity of PCB28 (a trichlorinated PCB), PCB52 (a tetrachlorinated PCB), PCB101 (a pentachlorinated PCB), and their mixture to earthworm <em>Eisenia fetida</em> in soil, and looked into the underlining mechanisms in an <em>in vitro</em><span> test using coelomocytes. After a 28-days exposure, all PCBs (up to 10 mg/kg) were not fatal to earthworms, but could induce intestinal histopathological changes and microbial community alterations in the drilosphere system, along with a significant weight loss. Notably, pentachlorinated PCBs with a low bioaccumulation ability showed greater inhibitory effects on the growth of earthworm than lowly chlorinated PCBs, suggesting that bioaccumulation was not the main determinant of chlorine substitution-dependent toxicity. Furthermore, </span><em>in vitro</em> assays showed that the highly chlorinated PCBs induced a high-percentage apoptosis of eleocytes in the coelomocytes and significantly activated antioxidant enzymes, indicating that the distinct cellular vulnerability to lowly/highly chlorinated PCBs was the main contributor to the PCBs toxicity. These findings emphasize the specific advantage of using earthworms in the control of lowly chlorinated PCBs in soil due to their high tolerance and accumulation ability.</p></div>","PeriodicalId":15774,"journal":{"name":"Journal of environmental sciences","volume":"128 ","pages":"Pages 171-180"},"PeriodicalIF":6.9,"publicationDate":"2023-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"10757922","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}

引用次数: 0

Identification of key precursors contributing to the formation of CX3R-type disinfection by-products along the typical full-scale drinking water treatment processes 鉴定在典型的全面饮用水处理过程中导致cx3r型消毒副产物形成的关键前体

IF 6.9

Journal of environmental sciences Pub Date : 2023-06-01 DOI: 10.1016/j.jes.2022.07.005

Xu Yang , Shunke Ding , Rong Xiao , Pin Wang , Zhenqi Du , Ruihua Zhang , Wenhai Chu

{"title":"Identification of key precursors contributing to the formation of CX3R-type disinfection by-products along the typical full-scale drinking water treatment processes","authors":"Xu Yang , Shunke Ding , Rong Xiao , Pin Wang , Zhenqi Du , Ruihua Zhang , Wenhai Chu","doi":"10.1016/j.jes.2022.07.005","DOIUrl":"https://doi.org/10.1016/j.jes.2022.07.005","url":null,"abstract":"<div><p>Identification and characterization of disinfection by-product (DBP) precursors could help optimize drinking water treatment processes and improve the quality of finished water. This study comprehensively investigated the characteristics of dissolved organic matter (DOM), the hydrophilicity and molecule weight (MW) of DBP precursor and DBP-associated toxicity along the typical full-scale treatment processes. The results showed that dissolved organic carbon and dissolved organic nitrogen content, the fluorescence intensity and the SUVA<sub>254</sub> value in raw water significantly decreased after the whole treatment processes. Conventional treatment processes were in favor of the removal of high-MW and hydrophobic DOM, which are important precursors of trihalomethane and haloacetic acid. Compared with conventional treatment processes, Ozone integrated with biological activated carbon (O<sub>3</sub>-BAC) processes enhanced the removal efficiencies of DOM with different MW and hydrophobic fractions, leading to a further decrease in almost all DBP formation potential and DBP-associated toxicity. However, almost 50% of the detected DBP precursors in raw water has not been removed after the coagulation-sedimentation-filtration integrated with O<sub>3</sub>-BAC advanced treatment processes. These remaining precursors were found to be mainly hydrophilic and low-MW (< 1.0 kDa) organics. Moreover, they would largely contribute to the formation of haloacetaldehydes and haloacetonitriles, which dominated the calculated cytotoxicity. Since current drinking water treatment process could not effectively control the highly toxic DBPs, the removal of hydrophilic and low-MW organics in drinking water treatment plants should be focused on in the future.</p></div>","PeriodicalId":15774,"journal":{"name":"Journal of environmental sciences","volume":"128 ","pages":"Pages 81-92"},"PeriodicalIF":6.9,"publicationDate":"2023-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49764664","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}

引用次数: 4