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Identification of high oxygen-consuming substances in stormwater drainage systems illicitly connected with sewage system

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Journal of Environmental Sciences 2024年第4期138卷 132-140页

作者： Chen Xu Zuxin Xu Wenhai Chu Shanshan Wu Rong Xiao Lei Su State Key Laboratory of Pollution Control and Resource Reuse College of Environmental Science and EngineeringTongji UniversityShanghai 200092China Ministry of Education Key Laboratory of Yangtze River Water Environment Tongji UniversityShanghai 200092China Guangzhou Resource Environmental Protection Technology Co. Ltd.Guangzhou 510030China

The dissolved oxygen content in water is an important indicator for assessing the quality of the water environment,and maintaining a certain amount of dissolved oxygen is essential for the healthy development of the ecological *** a water body is anoxic,the activity of anaerobic microorganisms increases and organic matter is decomposed to produce a large number of blackening and odorizing substances,resulting in black and odorous water bodies,which is a very common and typical phenomenon in ***,there is still a relatively universal occurrence of illicitly connected stormwater and sewage pipes in the urban drainage pipe network in China,which makes oxygen-consuming substances be directly discharged into rivers through stormwater pipes and consume the dissolved oxygen in the water bodies,resulting in an oxygen deficiency of the *** induces seasonal or year-round black and stink phenomena in urban ***,identifying high oxygen-consuming substances,which lays the foundation for the subsequent removal of oxygen-consuming substances,is *** a series of comparisons of water quality indicators and analysis of organic characteristics,it was found that the oxygen consumption capacity of domestic sewage was higher than that of industrial wastewater in the selected area of this study,and the oxygen-consuming substances of domestic sewage were small molecular amino *** comparing 20 conventional free amino acids,it was found that seven of them consumed oxygen easily,and compared with chemical oxygen consumption,biological oxygen consumption was in a leading position.

关键词： Urban drainage system Oxygen-consuming substances Domestic sewage Amino acid

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Acetylacetone effectively controlled the secondary metabolites of Microcystis aeruginosa under simulated sunlight irradiation

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Journal of Environmental Sciences 2024年第1期135卷 285-295页

作者： Xiaomeng Wang Yixin Luo Shujuan Zhang Lixiang Zhou Department of Environmental Engineering College of Resources and Environmental SciencesNanjing Agricultural UniversityNanjing 210095China The State Key Laboratory of Pollution Control and Resource Reuse School of the EnvironmentNanjing UniversityNanjing 210023China

Inactivation of cyanobacterial cells and simultaneous control of secondary metabolites is of significant necessity for the treatment of cyanobacteria-laden ***(AcAc)has been reported a specific algicide to inactivate Microcystis aeruginosa(***)and an effective light activator to degrade *** study systematically investigated the photodegradation ability of AcAc under xenon(Xe)irradiation on the secondary metabolites of ***,mainly algal organic matter(AOM),especially toxic microcystin-LR(MC-LR).Results showed that AcAc outperformed H_(2)O_(2)in destructing the protein-like substances,humic acid-like matters,aromatic proteins and fulvic-like substances of *** MC-LR(250μg/L),0.05 mmol/L AcAc attained the same degradation efficiency(87.0%)as 0.1mmol/L H_(2)O_(2).The degradation mechanism of Xe/AcAc might involve photo-induced energy/electron transfer and formation of carbon center *** conditions(pH>9.0)were detrimental to the photoactivity of AcAc,corresponding to the observed degradation rate constant(k_(1)value)of MC-LR drastically decreasing to 0.0013 min^(-1)as solution pH exceeded *** PO_(4)^(3-)and HCO_(3)^(-)ions had obvious inhibition effects,whereas NO_(3)^(-)slightly improved k_(1)value from 0.0277 min^(-1)to 0.0321 min^(-1).The presence of AOM did not significantly inhibit MC-LR degradation in Xe/AcAc *** addition,the biological toxicity of MC-LR was greatly reduced after *** results demonstrated that AcAc was an alternative algicidal agent to effectively inactivate algal cells and simultaneously control the secondary metabolites after cell ***,the concentration and irradiation conditions should be further optimized in practical application.

关键词： Microcystis aeruginosa Photodegradation Acetylacetone Secondary metabolites Microcystin

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"Forever chemicals":a sticky environmental problem

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Frontiers of Environmental Science & Engineering 2024年第10期18卷 175-183页

作者： Junhua Fang Shaolin Li Rongliang Qiu Wei-Xian Zhang College of Environmental Science and Engineering State Key Laboratory of Pollution Control and Resource ReuseTongji UniversityShanghai 200092China Guangdong Laboratory for Lingnan Modern Agriculture Guangzhou 510642China College of Natural Resources and Environment Guangdong Provincial Key Laboratory of Agricultural&Rural Pollution Abatement and Environmental SafetySouth China Agricultural UniversityGuangzhou 510642China

The discovery and widespread use of per-and poly-fluoroalkyl substances(PFAS)have exemplified the beneficial role of chemistry in modern life,yet *** also underscored significant environmental and health *** "forever chemicals"due to their remarkable persistence,PFAS present formidable challenges in terms of contamination and *** to address these challenges have led to the development of innovative degradation technologies,such as hydrothermal alkali treatment(HALT),low-temperature mineralization,and mechanochemical degradation,offering promising solutions to PFAS ***,these advancements must be accompanied by robust investment in research,collaboration among stakeholders,and global responsibility to ensure effective management of PFAs contamination and mitigate its adverse impacts on ecosystems and humanhealth.

关键词： PFAS Degradation technologies Environmental remediation Global responsibility

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Sex-dependent obesogenic effect of tetracycline on Drosophila melanogaster deteriorated by dysrhythmia

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Journal of Environmental Sciences 2023年第2期124卷 472-480页

作者： Xueping Guo Zhenyang Yu Daqiang Yin State Key Laboratory of Pollution Control and Resource Reuse Key Laboratory of Yangtze River Water EnvironmentMinistry of EducationCollege of Environmental Science and EngineeringTongji UniversityShanghai 200092China Jiaxing Tongji Institute for Environment Jiaxing 3014051China Shanghai Institute of Pollution Control and Ecological Security Shanghai 200092China

Antibiotics have been identified as obesogens contributing to the prevalence of ***,their environmental toxicity shows sex dependence,which might also explain the sex-dependent obesity ***,the direct evidence for such a connection and the underlying mechanisms remain to be *** this study,the effects of tetracycline,which is a representative antibiotic found in both environmental and food samples,on Drosophila melanogaster were studied with consideration of both sex and circadian rhythms(represented by the eclosion rhythm).Results showed that in morning-eclosed adults,tetracycline significantly stimulated the body weight of females(AM females)at 0.1,1.0,10.0 and 100.0μg/L,while tetracycline only stimulated the body weight of males(AM males)at 1.0μg/*** the afternoon-eclosed adults,tetracycline significantly stimulated the body weight of females(PM females)at 0.1,1.0 and 100.0μg/L,while it showed more significant stimulation in males(PM males)at all ***,the stimulation levels were the greatest in PMmales among all the *** results showed the clear sex dependence of the obesogenic effects,which was diminished by *** biochemical assays and clustering analysis suggested that the sex-and rhythm-dependent obesogenic effects resulted from the bias toward lipogenesis against ***,theywere closely related to the preference for the energy storage forms of lactate and glucose and also to the presence of excessive insulin,with the involvement of glucolipid *** relationships indicated potential bridges between the obesogenic effects of pollutants and other diseases,e.g.,cancer and diabetes.

关键词： Obesogenic effect Tetracycline Sex Circadian rhythm Glucolipid metabolism

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Identification of key precursors contributing to the formation of CX_(3)R-type disinfection by-products along the typical full-scale drinking water treatment processes

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Journal of Environmental Sciences 2023年第6期128卷 81-92页

作者： Xu Yang Shunke Ding Rong Xiao PinWang Zhenqi Du Ruihua Zhang Wenhai Chu State Key Laboratory of Pollution Control and Resource Reuse College of Environmental Science and EngineeringTongji UniversityShanghai 200092China Ministry of Education Key Laboratory of Yangtze River Water Environment Tongji UniversityShanghai 200092China

Identification and characterization of disinfection by-product(DBP)precursors could help optimize drinkingwater treatment processes and improve the quality of *** 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 *** results showed that dissolved organic carbon and dissolved organic nitrogen content,the fluorescence intensity and the SUVA254 value in raw water significantly decreased after the whole treatment *** treatment processes were in favor of the removal of high-MW and hydrophobic DOM,which are important precursors of trihalomethane and haloacetic *** with conventional treatment processes,Ozone integrated with biological activated carbon(O3-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 ***,almost 50%of the detected DBP precursors in raw water has not been removed after the coagulation-sedimentation-filtration integrated with O3-BAC advanced treatment *** remaining precursors were found to be mainly hydrophilic and low-MW(<1.0 kDa)***,they would largely contribute to the formation of haloacetaldehydes and haloacetonitriles,which dominated the calculated *** 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.

关键词： Disinfection by-products Drinking water Characterization key precursor Hydrophilicity MW distribution

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Microbes team with nanoscale zero-valent iron: A robust route for degradation of recalcitrant pollutants

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Journal of Environmental Sciences 2022年第8期34卷 140-146页

作者： Nuo Liu Jing Liu Hong Wang Shaolin Li Wei-xian Zhang State Key Laboratory for Pollution Control and Resource Reuse School of Environmental Science and EngineeringTongji UniversityShanghai 200092China

Integrating nanoscale zero-valent iron(nZVI) with biological treatment processes holds the promise of inheriting significant advantages from both environmental nano-and biotechnologies. nZVI and microbes can perform in coalition in direct contact and act simultaneously, or be maintained in separate reactors and operated sequentially. Both modes can generate enhanced performance for wastewater treatment and environmental remediation. nZVI scavenges and eliminates toxic metals, and enhances biodegradability of some recalcitrant contaminants while bioprocesses serve to mineralize organic compounds and further remove impurities from wastewater. This has been demonstrated in a number of recent works that nZVI can substantially augment the performance of conventional biological treatment for wastewaters from textile and nonferrous metal industries. Our recent laboratory and field tests show that COD of the industrial effluents can be reduced to a record-low of 50 ppm. Recent literature on the theory and applications of the nZVI-bio system is highlighted in this mini review.

关键词： Environmental microbiology Nanoscale zero-valent iron(nZVI) Remediation Wastewater nZVI-bio system

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Enhancing corn stalk-based anaerobic digestion with different types of zero-valent iron added during the acidification stage:Performance and mechanism

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Journal of Environmental Sciences 2024年第11期145卷 64-74页

作者： Xiang Liu Yue Liu Min Wang Qianzhen Deng Hao Yang College of Agricultural Science and Engineering Hohai UniversityNanjing 210098China State Key Joint Laboratory of Environment Simulation and Pollution Control School of EnvironmentTsinghua UniversityBeijing 100084China National and Local Joint Engineering Research Center of Ecological Treatment Technology for Urban Water Pollution Wenzhou UniversityWenzhou 325035China Anhui Provincial Key Laboratory of Environmental Pollution Control and Resource Reuse Anhui Jianzhu UniversityHefei 230009China

Anaerobic digestion has been defined as a competitive approach to facilitate the recycling of corn ***,few studies have focused on the role of direct interspecies electron transfer(DIET)pathway in the acidification stage under the addition of different particle sizes of zero-valent iron(ZVI).In this study,three types of ZVI,namely iron filings,iron powder and nanoscale iron,were investigated,respectively,to enhance its high-value *** in volatile fatty acids(VFAs)and methane(CH4)production associated with the underlyingmechanisms were emphatically *** indicated that the addition of ZVI could increase the concentration of VFAs,with the most outstanding performance observed with the use of nanoscale ***,the conversion of propionic acid to acetic acid was driven by adding ZVI with no between-group differences in acidizing ***,the substrate was more fully utilized when supplied with iron powder compared with other groups in methanogenic phase,thereby displaying the maximumCH4 yield with a value of 263.1 mL/(g total solids(TS)).However,adding nanoscale iron could signally shorten the digestion time(T80),saving 7 days in comparison to the group of iron powder.

关键词： Zero-valent iron Corn stalk Anaerobic digestion Volatile fatty acids Methane

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In-situ synthesis of layered double hydroxides with tunable basal spacing for efficient iodide over iodate adsorption selectivity

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Science China Chemistry 2025年第6期68卷 2424-2432页

作者： Xiaolu Liu Muliang Xiao Pei Chen Yilun Zhou Yinghui Xie Mengjie Hao Liang Mao Hui Yang Geoffrey I.N.Waterhouse Shengqian Ma Xiangke Wang College of Environmental Science and Engineering North China Electric Power University State Key Laboratory of Pollution Control and Resource Reuse School of the Environment Nanjing University School of Chemical Sciences the University of Auckland Department of Chemistry University of North Texas

Separating I3-and IO3-from aqueous solutions is technically challenging due to their very similar charge density. Herein, we describe the in-situ synthesis of cobalt-based layered double hydroxides（Co-LDHs） by decomposition of zeolite imidazole framework（ZIF） nanocrystals, whilst modulating the basal spacing in the Co-LDHs through anion intercalation（such as Br-,NO3-, and Cl O4-）. Co-LDH-NO3-possesses an optimal basal spacing of ～4.69 ?, which is slightly smaller than the van der Waals diameter of IO3-（～4.79 ?）, thus enabling selective adsorption of linear I3-（diameter ～4.22 ?） via ion exchange in the LDH interlayer. Co-LDH-NO3-showed ultrafast I3-uptake kinetics involving strong “host-guest” interaction forces, achieving high dynamic uptake capacities of 119.94 and 127.18 mg/g in I3-/IO3-contaminated groundwater and tap water, respectively, and～100% separation efficiencies towards I3-over IO3-. Co-LDH-Br-with a smaller basal spacing（4.06 ?） exhibited much slower separation kinetics, and Co-LDH-ClO4-with a ～5.36 ? basal spacing demonstrated poor separation efficiency under similar conditions. Ab initio molecular dynamics（AIMD） simulations were used to visually simulate the ion exchange process, with the results being consistent with the experimental observations. Furthermore, Co-LDH-NO3-demonstrated excellent reusability during dynamic breakthrough tests and I3-/IO3-separation cycles due to a “special memory effect” of the 2D interlayer. This work guides adsorbent design for the efficient removal and separation of iodine species from contaminated water.

关键词： I3−/IO3− separation, layered double hydroxides, tunable basal spacing, Co-LDH-NO3−, environmental management

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Electrochemical removal and recovery of phosphorus from wastewater using cathodic membrane filtration reactor

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Chinese Chemical Letters 2023年第4期34卷 410-414页

作者： Lehui Ren Jun Xu Ruobin Dai Zhiwei Wang State Key Laboratory of Pollution Control and Resource Reuse Advanced Membrane Technology Center of Tongji UniversityShanghai Institute of Pollution Control and Ecological SecuritySchool of Environmental Science and EngineeringTongji UniversityShanghai 200092China

Removal and recovery of phosphorus(P) from wastewater is of great importance to addressing the challenges of eutrophication and phosphorus shortage. The P removal and recovery performance of conventional electrochemical precipitation approach was constrained by the limited mass transfer rate. Herein,a cathodic membrane filtration(CMF) reactor was developed using Ti/SnO_(2)-Sb anode and titanium mesh cathodic membrane module to achieve efficient removal and recovery of P in wastewater. Compared with the flow-by mode, the CMF system in the flow-through mode exhibited excellent P removal performance due to the markedly enhanced mass transfer. At the current density of 4 A/m^(2), membrane flux of 16.6 L m^(-2)h^(-1), and Ca/P molar ratio of 1.67, the removal efficiency of P was 96.2% and the energy consumption was only 45.7 k Wh/kg P. The local high p H of cathode surface played a vital role in P removal,which substantially accelerated the nucleation of calcium phosphate(Ca P). Based on the crystalline and morphological characterization of the precipitates, the hydroxyapatite was the most stable crystalline phase of Ca P, which was transformed from intermediate phases(such as dicalcium phosphate and amorphous calcium phosphate). This study paves the way for applying electrochemical membrane filtration system for P removal and recovery from wastewater.

关键词： Phosphate removal Electrochemical precipitation Cathodic membrane filtration Enhanced mass transfer Calcium phosphate

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Synergy of metal-support interaction and positive Pd species promoting efficient C-CI bond activation on Pd-based Ce-MOF-derived catalysts

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Rare Metals 2024年第11期43卷 5835-5847页

作者： Xiao-Jie Hu Yu-Han Sun Ling-Yue Liu Dan-Jun Mao Shou-Rong Zheng State Key Laboratory of Pollution Control and Resource Reuse School of the EnvironmentNanjing UniversityNanjing 210023China Department of Applied Biology and Chemical Technology The Hong Kong Polytechnic UniversityHong Kong 999077Hong KongChina

Monochloroacetic acid(MCAA)is identified as a highly carcinogenic disinfection by-product in chlorinated drinking *** this study,a series of CeO_(2)-supported Pd catalysts(Pd/MCeO_(2))were synthesized through one-step calcination of Pd-loaded Ce-UiO-66-BDC(CeMOF),and the liquid-phase catalytic hydrodechlorination of MCA A was explored using these *** comparison,Pd/CeO_(2)catalysts were additionally synthesized using the conventional impregnation *** characterization results reveal that the catalysts exhibit strong metal-support interaction,leading to high Pd dispersion and Pd^(n+)***,the calcination temperature significantly influences catalytic performance,with the catalyst calcined at 500℃(Pd/MCeO_(2)-500)demonstrating the highest catalytic activity and achieving complete dechlorination of MCA A within 50 ***,it is found that the catalytic MCAA hydrodechlorination using the catalysts adheres to the Langmuir-Hinshelwood ***,low reaction pH is favorable for the catalytic hydrodechlorination of MCAA,enhancing MCAA adsorption on the catalyst surface due to the electrostatic interaction between MCAA and the catalyst *** results suggest that the presence of Pd^(n+)efficiently facilitates MCAA adsorption and C-Cl cleavage,thus significantly enhancing the liquid-phase catalytic hydrodechlorination.

关键词： Ce-UiO-66-BDC One-step calcination Metal-support interaction Liquid-phase catalytic hydrodechlorination Monochloroacetic acid

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