Pub Date : 2026-02-05DOI: 10.1016/j.jhazmat.2026.141401
Yan Lyu, Jiahong Zheng, Ying Han, Peisong Luo, Danni Wu, Zhentao Wu, Xiaobing Pang
{"title":"Characterization of secondary formation of wintertime PM2.5 in eastern China: The role of relative humidity","authors":"Yan Lyu, Jiahong Zheng, Ying Han, Peisong Luo, Danni Wu, Zhentao Wu, Xiaobing Pang","doi":"10.1016/j.jhazmat.2026.141401","DOIUrl":"https://doi.org/10.1016/j.jhazmat.2026.141401","url":null,"abstract":"","PeriodicalId":361,"journal":{"name":"Journal of Hazardous Materials","volume":"95 1","pages":""},"PeriodicalIF":13.6,"publicationDate":"2026-02-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146135164","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2026-02-05DOI: 10.1016/j.jhazmat.2026.141399
Changai Fu, Yonglan Xu, Yan Chen, Xu Wang, Xiaoyi Ma, Xiaoyu Wang, Li Li
Aromatics contamination has posed a significant threat to global ecosystems. During bioremediation, transcriptional regulation of aromatics catabolic genes serves as a subtle switch for controlling functional organisms, particularly in engineering synthetic microbes. LysR-type transcriptional regulators and the quorum sensing LuxR family regulators LuxR solos, are prevalent in bacteria, participating in regulating metabolism and physiological activities. However, their coordination for catabolic genes regulation remains poorly understood. In this study, we examined the relationship between LysR and LuxR solo and the underlying mechanisms for transcriptional regulation of dibenzofuran-catabolic genes in Rhodococcus sp. strain p52, which harbors distinct dioxins-catabolic gene clusters on plasmids pDF01 and pDF02. Our results demonstrated that the self-regulatory LysR encoded on pDF02 repressed the expression of catabolic genes on the same plasmid through binding to the dbfA promoter, and dibenzofuran relieved the inhibition of LysR. Additionally, the LysR inhibited the expression of the luxR solo located on pDF01, which regulates the catabolic genes on that plasmid. Transcriptomic and proteomic analyses revealed that the LysR acted as a master switch for metabolism regulation, influencing central metabolism and oxidative phosphorylation, besides dibenzofuran peripheral pathway degradation. This study broadens our understanding of bacterial transcriptional regulatory hierarchies during aromatics biodegradation.
{"title":"The LysR orchestrates expression of dibenzofuran catabolic genes in a dioxins-degrader Rhodococcus sp. by direct handling and coordinating with LuxR solo","authors":"Changai Fu, Yonglan Xu, Yan Chen, Xu Wang, Xiaoyi Ma, Xiaoyu Wang, Li Li","doi":"10.1016/j.jhazmat.2026.141399","DOIUrl":"https://doi.org/10.1016/j.jhazmat.2026.141399","url":null,"abstract":"Aromatics contamination has posed a significant threat to global ecosystems. During bioremediation, transcriptional regulation of aromatics catabolic genes serves as a subtle switch for controlling functional organisms, particularly in engineering synthetic microbes. LysR-type transcriptional regulators and the quorum sensing LuxR family regulators LuxR solos, are prevalent in bacteria, participating in regulating metabolism and physiological activities. However, their coordination for catabolic genes regulation remains poorly understood. In this study, we examined the relationship between LysR and LuxR solo and the underlying mechanisms for transcriptional regulation of dibenzofuran-catabolic genes in <em>Rhodococcus</em> sp. strain p52, which harbors distinct dioxins-catabolic gene clusters on plasmids pDF01 and pDF02. Our results demonstrated that the self-regulatory LysR encoded on pDF02 repressed the expression of catabolic genes on the same plasmid through binding to the <em>dbfA</em> promoter, and dibenzofuran relieved the inhibition of LysR. Additionally, the LysR inhibited the expression of the <em>luxR</em> solo located on pDF01, which regulates the catabolic genes on that plasmid. Transcriptomic and proteomic analyses revealed that the LysR acted as a master switch for metabolism regulation, influencing central metabolism and oxidative phosphorylation, besides dibenzofuran peripheral pathway degradation. This study broadens our understanding of bacterial transcriptional regulatory hierarchies during aromatics biodegradation.","PeriodicalId":361,"journal":{"name":"Journal of Hazardous Materials","volume":"1 1","pages":""},"PeriodicalIF":13.6,"publicationDate":"2026-02-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146115958","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2026-02-05DOI: 10.1016/j.jhazmat.2026.141284
Jiajie Zhou, Shaohong Wang, Yan Tian, Yingqi Wang, Guohong Liu, Da Li, Tongtong Liu, Dahong Chen, Yujie Feng
Conventional Fenton-like systems for in-situ chemical oxidation (ISCO) face significant challenges, including non-productive consumption of reactive oxygen species (ROS) and inefficient Fe(III)/Fe(II) circulation. This study developed a novel Fenton-like system for polycyclic aromatic hydrocarbons (PAHs) remediation employing potassium peroxoborate (PPB) as oxidant coupled with iron nitrilotriacetic acid (Fe(III)/NTA). The proposed PPB/Fe(III)/NTA system achieved 6.34-folds higher degradation efficiency of pyrene comparing with the H2O2/Fe(III)/NTA system. Sustainable H2O2 generation from PPB reduced the non-productive loss of ROS. Crucially, this system generated superoxide radicals (•O2−) at a rate 7 orders of magnitude greater than the H2O2 counterpart. Integrated analysis via electron paramagnetic resonance, isotopic tracing (18O-labeling), and density functional theory calculations revealed that •O2− originates from PPB's water-mediated O-O bond cleavage, with oxygen atoms derived exclusively from PPB. Endogenous •O2− accelerated Fe(III) reduction to Fe(II), bypassing the rate-limiting step in traditional Fenton-like system. Moreover, actual contaminated soil remediation experiments verified the feasibility of PPB/Fe(III)/NTA in a real polluted site, in which total PAHs removed by 66 %, outperforming the H2O2/Fe(III)/NTA system (29 % removal). These findings highlight PPB’s dual function as a ROS reservoir and endogenous activator, expanding the understanding of the activation mechanisms of Fenton-like reactions and presenting a promising strategy for efficient ISCO remediation.
{"title":"Unlocking inherent superoxide production from potassium peroxoborate for efficient PAHs degradation","authors":"Jiajie Zhou, Shaohong Wang, Yan Tian, Yingqi Wang, Guohong Liu, Da Li, Tongtong Liu, Dahong Chen, Yujie Feng","doi":"10.1016/j.jhazmat.2026.141284","DOIUrl":"https://doi.org/10.1016/j.jhazmat.2026.141284","url":null,"abstract":"Conventional Fenton-like systems for in-situ chemical oxidation (ISCO) face significant challenges, including non-productive consumption of reactive oxygen species (ROS) and inefficient Fe(III)/Fe(II) circulation. This study developed a novel Fenton-like system for polycyclic aromatic hydrocarbons (PAHs) remediation employing potassium peroxoborate (PPB) as oxidant coupled with iron nitrilotriacetic acid (Fe(III)/NTA). The proposed PPB/Fe(III)/NTA system achieved 6.34-folds higher degradation efficiency of pyrene comparing with the H<sub>2</sub>O<sub>2</sub>/Fe(III)/NTA system. Sustainable H<sub>2</sub>O<sub>2</sub> generation from PPB reduced the non-productive loss of ROS. Crucially, this system generated superoxide radicals (•O<sub>2</sub><sup>−</sup>) at a rate 7 orders of magnitude greater than the H<sub>2</sub>O<sub>2</sub> counterpart. Integrated analysis via electron paramagnetic resonance, isotopic tracing (<sup>18</sup>O-labeling), and density functional theory calculations revealed that •O<sub>2</sub><sup>−</sup> originates from PPB's water-mediated O-O bond cleavage, with oxygen atoms derived exclusively from PPB. Endogenous •O<sub>2</sub><sup>−</sup> accelerated Fe(III) reduction to Fe(II), bypassing the rate-limiting step in traditional Fenton-like system. Moreover, actual contaminated soil remediation experiments verified the feasibility of PPB/Fe(III)/NTA in a real polluted site, in which total PAHs removed by 66 %, outperforming the H<sub>2</sub>O<sub>2</sub>/Fe(III)/NTA system (29 % removal). These findings highlight PPB’s dual function as a ROS reservoir and endogenous activator, expanding the understanding of the activation mechanisms of Fenton-like reactions and presenting a promising strategy for efficient ISCO remediation.","PeriodicalId":361,"journal":{"name":"Journal of Hazardous Materials","volume":"31 1","pages":""},"PeriodicalIF":13.6,"publicationDate":"2026-02-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146115961","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2026-02-05DOI: 10.1016/j.jhazmat.2026.141357
Aleksandra Repić, Dragana Vukelić, Vera Lukić, Olivera Savić, Ivan Potić, Milena Andjelković, Stefan Mandić-Rajčević, Biljana Antonijević, Aleksandra Buha Djordjević, Petar Bulat, Zorica Bulat
{"title":"The influence of sociodemographic factors on blood lead levels in healthy adults living in Belgrade, Serbia","authors":"Aleksandra Repić, Dragana Vukelić, Vera Lukić, Olivera Savić, Ivan Potić, Milena Andjelković, Stefan Mandić-Rajčević, Biljana Antonijević, Aleksandra Buha Djordjević, Petar Bulat, Zorica Bulat","doi":"10.1016/j.jhazmat.2026.141357","DOIUrl":"https://doi.org/10.1016/j.jhazmat.2026.141357","url":null,"abstract":"","PeriodicalId":361,"journal":{"name":"Journal of Hazardous Materials","volume":"15 1","pages":""},"PeriodicalIF":13.6,"publicationDate":"2026-02-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146135163","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2026-02-05DOI: 10.1016/j.jhazmat.2026.141398
Xiaoxi Kang, Ze Zhao, Xinyu Zhu, Feng Ju
Plasticizers are widely used additives that leach from plastic products and accumulate in landfills, yet the microbial functions supporting their degradation remain poorly resolved. Here, we combined curated functional annotation, substrate-driven enrichment, and isolate-level validation to dissect plasticizer degradation in landfill microbiomes. A plasticizer-degrading enzyme (PzDE) hidden Markov model database (PzDE-HMM) was assembled from 49 experimentally validated enzyme families. It was applied to metagenomes from five landfill niches, identifying 2,219 candidate plasticizer-degrading genes, which is 3.6- and 19-fold more than those identified by KofamScan- and BLASTp-based annotation methods, respectively. Enrichment with three legacy phthalates (DEHP, DIDP, DBP) and three non-phthalate plasticizers (DOTP, DOA, ATBC) drove pronounced shifts in landfill microbial communities and functional gene repertoires, revealing coexisting broad-spectrum and substrate-specific degraders. Culture-based isolation from enriched media yielded 51 strains, and three representative isolates showed concordance between PzDE-HMM-predicted gene repertoires, substrate breadth, and degradation ability. Synthetic consortia assembled from these strains exhibited complementary degradation capacities and achieved higher removal of several plasticizers than the best single strains, illustrating how complementary gene sets can be combined to enhance multi-substrate degradation. Together, PzDE-HMM annotation workflow and this multilevel prediction–enrichment–isolate–consortium framework uncover the plasticizer-degrading and bioremediation potential of landfill microbiomes and provide a reusable resource and workflow for future plasticizer-focused microbiome studies.
{"title":"Uncovering Plasticizer-Degrading Potential in Landfill Microbiomes with Curated PzDE-HMM Database and Multi-Scale Validation from Isolates to Synthetic Consortia","authors":"Xiaoxi Kang, Ze Zhao, Xinyu Zhu, Feng Ju","doi":"10.1016/j.jhazmat.2026.141398","DOIUrl":"https://doi.org/10.1016/j.jhazmat.2026.141398","url":null,"abstract":"Plasticizers are widely used additives that leach from plastic products and accumulate in landfills, yet the microbial functions supporting their degradation remain poorly resolved. Here, we combined curated functional annotation, substrate-driven enrichment, and isolate-level validation to dissect plasticizer degradation in landfill microbiomes. A plasticizer-degrading enzyme (PzDE) hidden Markov model database (PzDE-HMM) was assembled from 49 experimentally validated enzyme families. It was applied to metagenomes from five landfill niches, identifying 2,219 candidate plasticizer-degrading genes, which is 3.6- and 19-fold more than those identified by KofamScan- and BLASTp-based annotation methods, respectively. Enrichment with three legacy phthalates (DEHP, DIDP, DBP) and three non-phthalate plasticizers (DOTP, DOA, ATBC) drove pronounced shifts in landfill microbial communities and functional gene repertoires, revealing coexisting broad-spectrum and substrate-specific degraders. Culture-based isolation from enriched media yielded 51 strains, and three representative isolates showed concordance between PzDE-HMM-predicted gene repertoires, substrate breadth, and degradation ability. Synthetic consortia assembled from these strains exhibited complementary degradation capacities and achieved higher removal of several plasticizers than the best single strains, illustrating how complementary gene sets can be combined to enhance multi-substrate degradation. Together, PzDE-HMM annotation workflow and this multilevel prediction–enrichment–isolate–consortium framework uncover the plasticizer-degrading and bioremediation potential of landfill microbiomes and provide a reusable resource and workflow for future plasticizer-focused microbiome studies.","PeriodicalId":361,"journal":{"name":"Journal of Hazardous Materials","volume":"110 1","pages":""},"PeriodicalIF":13.6,"publicationDate":"2026-02-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146121956","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2026-02-05DOI: 10.1016/j.jhazmat.2026.141402
H.H. Zhang, A.C.K. Lai
Localized air disinfection is an effective strategy for reducing airborne pathogen transmission, though combining methods may yield only additive effects or, in some cases, synergistic efficacy. This study experimentally examined the single-pass disinfection efficiency of individual and combined Far-UVC and negative ionizers in a custom-built portable disinfection unit. Several influencing factors were comprehensively investigated: light-redistribution, number of ionizers, Far-UVC lamp arrangement, flow rate, and microbial type. Four microorganisms, including two common bacteria (Escherichia coli and Staphylococcus epidermidis) and two bacteriophages representing viruses (MS2 and P22), were tested at various airflow rates ranging from 81 to 144 m3/h. The results showed that light‑redistribution by enhancing wall reflection increased disinfection efficiency by 20% to 110% compared to the control condition without light‑redistribution. Microbial susceptibility was evaluated for Far-UVC light, and sensitivity to negative ions was also determined. The results demonstrated that airborne E. coli was the most susceptible to Far-UVC. In contrast to the bacteria, the airborne viruses MS2 and P22 were more sensitive to negative ions. The results revealed that the combination of Far-UVC and ionizers exhibited a synergistic effect for those tested bacteria, producing a disinfection efficiency greater than the sum of their individual contributions. Furthermore, a horizontal arrangement of two Far-UVC lamps provided better disinfection than a vertical arrangement. The findings from this work offer valuable insights into strategies to enhance air disinfection performance, facilitating the development of novel portable devices that effectively disinfect bioaerosols.
{"title":"Synergistic Air Disinfection by Far-UVC and Negative Air Ions in a Portable Device","authors":"H.H. Zhang, A.C.K. Lai","doi":"10.1016/j.jhazmat.2026.141402","DOIUrl":"https://doi.org/10.1016/j.jhazmat.2026.141402","url":null,"abstract":"Localized air disinfection is an effective strategy for reducing airborne pathogen transmission, though combining methods may yield only additive effects or, in some cases, synergistic efficacy. This study experimentally examined the single-pass disinfection efficiency of individual and combined Far-UVC and negative ionizers in a custom-built portable disinfection unit. Several influencing factors were comprehensively investigated: light-redistribution, number of ionizers, Far-UVC lamp arrangement, flow rate, and microbial type. Four microorganisms, including two common bacteria (<em>Escherichia coli</em> and <em>Staphylococcus epidermidis</em>) and two bacteriophages representing viruses (MS2 and P22), were tested at various airflow rates ranging from 81 to 144 m<sup>3</sup>/h. The results showed that light‑redistribution by enhancing wall reflection increased disinfection efficiency by 20% to 110% compared to the control condition without light‑redistribution. Microbial susceptibility was evaluated for Far-UVC light, and sensitivity to negative ions was also determined. The results demonstrated that airborne <em>E. coli</em> was the most susceptible to Far-UVC. In contrast to the bacteria, the airborne viruses MS2 and P22 were more sensitive to negative ions. The results revealed that the combination of Far-UVC and ionizers exhibited a synergistic effect for those tested bacteria, producing a disinfection efficiency greater than the sum of their individual contributions. Furthermore, a horizontal arrangement of two Far-UVC lamps provided better disinfection than a vertical arrangement. The findings from this work offer valuable insights into strategies to enhance air disinfection performance, facilitating the development of novel portable devices that effectively disinfect bioaerosols.","PeriodicalId":361,"journal":{"name":"Journal of Hazardous Materials","volume":"176 1","pages":""},"PeriodicalIF":13.6,"publicationDate":"2026-02-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146115956","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2026-02-04DOI: 10.1016/j.jhazmat.2026.141382
Fangyuan Jiang, Jiaqi Ran, Feifei Wang, Yao Qu, Kaidi Lai, Ruixin Qu, Wenyuan Yang, Cheng Ye, Wenhai Chu
In subtropical monsoon regions, eutrophic lakes frequently experience concurrent heavy rainfall and algal blooms during the wet seasons. However, the combined effects of these events on source-water quality remain poorly understood. This study investigated the influence of rainfall on disinfection byproduct (DBP) formation potentials during algal blooms in Chaohu Lake—a critical water source servicing approximately 9 million people—and elucidated the dissolved organic matter (DOM)-mediated mechanisms underlying DBP variability. Following rainfall, total organic halogen concentrations in chlorinated lake waters increased from 537.6 ± 107.1 μg/Lto 716.5 ± 187.7 μg/L as Cl, accompanied by a 1.5- to 3.3-fold rise in DBP-associated cytotoxicity and a marked shift in DBP composition. Notably, post-rainfall concentrations of haloacetaldehydes (HALs) and haloacetic acids (HAAs) increased significantly, whereas haloacetonitriles (HANs) decreased. This pattern aligns with a shift in DOM composition—from predominantly algal-derived constituents before rainfall to terrestrial-dominated components afterward, which explains the observed changes in DBP formation potential. Specifically, the post-rainfall decline in tyrosine-like proteins—key precursors of HANs—was associated with reduced HAN formation. Conversely, the increase in fulvic and humic acids, strongly promoted HAL and HAA formation. Multiple linear regression identified water temperature, dissolved organic carbon, dissolved organic nitrogen, the biological index, and the humification index as key predictors of major DBP formation. These findings underscore the urgent need for targeted management of key water-quality parameters to mitigate DBP precursor levels in eutrophic lakes, particularly following rainfall events.
{"title":"Rainfall-driven shifts in disinfection byproduct precursors in eutrophic lakes: From algal to terrestrial sources","authors":"Fangyuan Jiang, Jiaqi Ran, Feifei Wang, Yao Qu, Kaidi Lai, Ruixin Qu, Wenyuan Yang, Cheng Ye, Wenhai Chu","doi":"10.1016/j.jhazmat.2026.141382","DOIUrl":"https://doi.org/10.1016/j.jhazmat.2026.141382","url":null,"abstract":"In subtropical monsoon regions, eutrophic lakes frequently experience concurrent heavy rainfall and algal blooms during the wet seasons. However, the combined effects of these events on source-water quality remain poorly understood. This study investigated the influence of rainfall on disinfection byproduct (DBP) formation potentials during algal blooms in Chaohu Lake—a critical water source servicing approximately 9 million people—and elucidated the dissolved organic matter (DOM)-mediated mechanisms underlying DBP variability. Following rainfall, total organic halogen concentrations in chlorinated lake waters increased from 537.6 ± 107.1<!-- --> <!-- -->μg/Lto 716.5 ± 187.7<!-- --> <!-- -->μg/L as Cl, accompanied by a 1.5- to 3.3-fold rise in DBP-associated cytotoxicity and a marked shift in DBP composition. Notably, post-rainfall concentrations of haloacetaldehydes (HALs) and haloacetic acids (HAAs) increased significantly, whereas haloacetonitriles (HANs) decreased. This pattern aligns with a shift in DOM composition—from predominantly algal-derived constituents before rainfall to terrestrial-dominated components afterward, which explains the observed changes in DBP formation potential. Specifically, the post-rainfall decline in tyrosine-like proteins—key precursors of HANs—was associated with reduced HAN formation. Conversely, the increase in fulvic and humic acids, strongly promoted HAL and HAA formation. Multiple linear regression identified water temperature, dissolved organic carbon, dissolved organic nitrogen, the biological index, and the humification index as key predictors of major DBP formation. These findings underscore the urgent need for targeted management of key water-quality parameters to mitigate DBP precursor levels in eutrophic lakes, particularly following rainfall events.","PeriodicalId":361,"journal":{"name":"Journal of Hazardous Materials","volume":"68 1","pages":""},"PeriodicalIF":13.6,"publicationDate":"2026-02-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146115994","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2026-02-04DOI: 10.1016/j.jhazmat.2026.141381
Hannah Mae Portus, Min Jeong Ban, Keugtae Kim, Kyung Hwa Cho, Sungpyo Kim, Jin Hwi Kim, Joo-Hyon Kang
{"title":"Temporal fusion transformer-based forecasting of COVID-19 infection trends using environmental indicators","authors":"Hannah Mae Portus, Min Jeong Ban, Keugtae Kim, Kyung Hwa Cho, Sungpyo Kim, Jin Hwi Kim, Joo-Hyon Kang","doi":"10.1016/j.jhazmat.2026.141381","DOIUrl":"https://doi.org/10.1016/j.jhazmat.2026.141381","url":null,"abstract":"","PeriodicalId":361,"journal":{"name":"Journal of Hazardous Materials","volume":"310 1","pages":""},"PeriodicalIF":13.6,"publicationDate":"2026-02-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146135166","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2026-02-04DOI: 10.1016/j.jhazmat.2026.141392
Yuhang Cai, Jing-Yuan Zhai, Zhang Guo-Hui, Mei-Qi Lin, Yi-Hao Luo
Xanthates are widely used collectors in sulfide ore flotation, but pose ecological risks due to their toxicity and the releasing of carbon disulfide (CS2). This study systematically investigated the biodegradation of three representative xanthates—potassium amyl xanthate (PAX), potassium butyl xanthate (PBX), and potassium isopropyl xanthate (PIX)—in an oxygen-based membrane biofilm reactor (O2-MBfR). The O2-MBfR achieved over 98% removal of all xanthates across surface loadings up to 6000 mg-COD/m2·d, with corresponding COD removals of 62-90%. While PIX exhibited slightly lower COD removal due to the slower oxidation of its branched isopropyl group, functional gene analyses revealed the co-enrichment of alcohol and sulfur oxidation genes (adh, ALDH, soxABC/XYZ, fccAB) and C–S bond cleavage genes (cynT, ssuD). Metagenomic and metatranscriptomic results showed that Pseudomonas and Rhodanobacter predominated in PIX degradation, whereas Thiobacillus, Zoogloea, and Ottowia were mainly involved in PAX and PBX oxidation. Monod kinetics indicated that PIX had the highest maximum specific degradation rate (33.85 mg/gVSS/h) and lowest sCOD decay rate constant (0.29 h-1), reflecting strong microbial affinity but limited mineralization. Continuous-flow treatment of real flotation wastewater achieved >98% xanthate and ~85% COD removal, confirming system robustness. These findings provide mechanistic insight into the structure-dependent biodegradability of xanthates and demonstrate the feasibility of O2-MBfR technology for sustainable treatment of flotation wastewater.
{"title":"Biodegradation of Three Xanthates with Different Carbon Chains in Flotation Wastewater","authors":"Yuhang Cai, Jing-Yuan Zhai, Zhang Guo-Hui, Mei-Qi Lin, Yi-Hao Luo","doi":"10.1016/j.jhazmat.2026.141392","DOIUrl":"https://doi.org/10.1016/j.jhazmat.2026.141392","url":null,"abstract":"Xanthates are widely used collectors in sulfide ore flotation, but pose ecological risks due to their toxicity and the releasing of carbon disulfide (CS<sub>2</sub>). This study systematically investigated the biodegradation of three representative xanthates—potassium amyl xanthate (PAX), potassium butyl xanthate (PBX), and potassium isopropyl xanthate (PIX)—in an oxygen-based membrane biofilm reactor (O<sub>2</sub>-MBfR). The O<sub>2</sub>-MBfR achieved over 98% removal of all xanthates across surface loadings up to 6000 mg-COD/m<sup>2</sup>·d, with corresponding COD removals of 62-90%. While PIX exhibited slightly lower COD removal due to the slower oxidation of its branched isopropyl group, functional gene analyses revealed the co-enrichment of alcohol and sulfur oxidation genes (<em>adh</em>, <em>ALDH</em>, <em>soxABC/XYZ</em>, <em>fccAB</em>) and C–S bond cleavage genes (<em>cynT</em>, <em>ssuD</em>). Metagenomic and metatranscriptomic results showed that <em>Pseudomonas</em> and <em>Rhodanobacter</em> predominated in PIX degradation, whereas <em>Thiobacillus</em>, <em>Zoogloea</em>, and <em>Ottowia</em> were mainly involved in PAX and PBX oxidation. Monod kinetics indicated that PIX had the highest maximum specific degradation rate (33.85<!-- --> <!-- -->mg/gVSS/h) and lowest sCOD decay rate constant (0.29<!-- --> <!-- -->h<sup>-1</sup>), reflecting strong microbial affinity but limited mineralization. Continuous-flow treatment of real flotation wastewater achieved >98% xanthate and ~85% COD removal, confirming system robustness. These findings provide mechanistic insight into the structure-dependent biodegradability of xanthates and demonstrate the feasibility of O<sub>2</sub>-MBfR technology for sustainable treatment of flotation wastewater.","PeriodicalId":361,"journal":{"name":"Journal of Hazardous Materials","volume":"280 1","pages":""},"PeriodicalIF":13.6,"publicationDate":"2026-02-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146115996","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"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}
Aesthetic parameters have become integral to drinking water reservoir management, yet the pronounced spatiotemporal heterogeneity of odorants challenges effective control. Current knowledge gaps include comprehensive characterization of seasonal/spatial odorant patterns and their associated factors, hindering evidence-based mitigation strategies. To address these gaps, we systematically analyzed 1005 observations from 22 reservoirs worldwide, quantifying spatiotemporal dynamics of four typical odorants—2-methylisoborneol (2-MIB), geosmin (GSM), β-ionone and β-cyclocitral—alongside key environmental parameters, while elucidating critical factor interactions. Results showed odorant concentrations peaked in spring and autumn, followed by summer and winter. 2-MIB and GSM maximized in transition zones whereas β-ionone and β-cyclocitral peaked in lacustrine zones; all odorants minimized near dams. Mixed-effects modeling identified chlorophyll-a (Chla), temperature, disolved oxygen, pH, total nitrogen, total phosphorus as critical predictors with odorant-specific effect magnitudes. Linear regressions revealed consistent spring-autumn patterns but divergent summer-winter trends, with significant factor-odorant relationships increasing progressively from riverine (n = 4) to lacustrine zones (n = 7). Structural equation modeling demonstrated interconnected temperature-Chla-nutrient networks exerting compound-specific effects on odorant formation. Based on these insights, we propose an integrated “Monitor-Predict-Control” framework, which translates the identified seasonal and spatial patterns into concrete, actionable strategies for proactive reservoir odorant management.
{"title":"Unraveling the spatiotemporal heterogeneity of odorous compounds and their associated parameters in drinking water reservoirs: A systematic review","authors":"Yufei Lv, Cheng Cen, Zejian Li, Kejia Zhang, Xinyan Zhou","doi":"10.1016/j.jhazmat.2026.141383","DOIUrl":"https://doi.org/10.1016/j.jhazmat.2026.141383","url":null,"abstract":"Aesthetic parameters have become integral to drinking water reservoir management, yet the pronounced spatiotemporal heterogeneity of odorants challenges effective control. Current knowledge gaps include comprehensive characterization of seasonal/spatial odorant patterns and their associated factors, hindering evidence-based mitigation strategies. To address these gaps, we systematically analyzed 1005 observations from 22 reservoirs worldwide, quantifying spatiotemporal dynamics of four typical odorants—2-methylisoborneol (2-MIB), geosmin (GSM), β-ionone and β-cyclocitral—alongside key environmental parameters, while elucidating critical factor interactions. Results showed odorant concentrations peaked in spring and autumn, followed by summer and winter. 2-MIB and GSM maximized in transition zones whereas β-ionone and β-cyclocitral peaked in lacustrine zones; all odorants minimized near dams. Mixed-effects modeling identified chlorophyll-a (Chla), temperature, disolved oxygen, pH, total nitrogen, total phosphorus as critical predictors with odorant-specific effect magnitudes. Linear regressions revealed consistent spring-autumn patterns but divergent summer-winter trends, with significant factor-odorant relationships increasing progressively from riverine (<em>n =</em> 4) to lacustrine zones (<em>n =</em> 7). Structural equation modeling demonstrated interconnected temperature-Chla-nutrient networks exerting compound-specific effects on odorant formation. Based on these insights, we propose an integrated “Monitor-Predict-Control” framework, which translates the identified seasonal and spatial patterns into concrete, actionable strategies for proactive reservoir odorant management.","PeriodicalId":361,"journal":{"name":"Journal of Hazardous Materials","volume":"47 1","pages":""},"PeriodicalIF":13.6,"publicationDate":"2026-02-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146121995","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"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}
京公网安备 11010802042870号
京ICP备2023020795号-1
扫码关注我们
求助内容：
应助结果提醒方式：