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Removal of refractory organics and heavy metals in landfill leachate concentrate by peroxi-coagulation process

Journal of environmental Sciences 2022年第6期34卷 43-51页

作者： Dun Liu Ying Yuan Yuquan Wei Hao Zhang Yanxiao Si Fang Zhang School of Environment and State Key Joint Laboratory of Environment Simulation and Pollution Control Tsinghua UniversityBeijing 100084China Beijing Advanced Innovation Center for Big Data-based Precision Medicine Beihang UniversityBeijing 100191China

Landfill leachate is a complex effluent and it is difficult to deal with. Electrochemical methods have been considered as a promising alternative technology for treatment of landfill leachate with refractory organic contaminants and heavy metals. Peroxi-coagulation(PC)process with iron anode and modified graphite felt cathode was developed for efficient landfill leachate concentrate treatment. Compared to electro-Fenton(EF) and electrocoagulation(EC) processes, the PC process was more cost-effective due to the combined action of·OH oxidation and iron hydroxides coagulation. A maximal TOC removal of 77.2% ± 1.4% was obtained after 360 min at initial p H = 5.0 and current density of 10 m A/cm^(2). After the PC process, concentrations of all seven heavy metals in the final effluents were below the allowable emission limits given by the present regulatory standards. The method preference for heavy metal removal was PC > EC > EF. Based on the three-dimensional fluorescence spectroscopy coupled with regional integration analysis during the PC treatment, the florescence peaks of both humic acids and fulvic acids disappeared after treatment for 360min. Decreasing trends were observed in the fluorescent regional standard volumes for aromatic protein Ⅰ(31.4%), aromatic protein Ⅱ(63.7%), fulvic acid-like(69.5%), soluble microbial by-product-like(75%) and humic acid-like regions(76.3%). The results indicate that comparing to the EF and EC process, the PC process provide a promising and more cost-effective alternative for the treatment of landfill leachate concentrate.

关键词： Landfill leachate Peroxi-coagulation Electro-Fenton Electrocoagulation Modified cathode

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Deciphering decadal urban ozone trends from historical records since 1980

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National Science Review 2024年第11期11卷 117-129页

作者： Haolin Wang Xiao Lu Paul I.Palmer Lin Zhang Keding Lu Ke Li Tatsuya Nagashima Ja-Ho Koo Hiroshi Tanimoto Haichao Wang Meng Gao Cheng He Kai Wu Shaojia Fan Yuanhang Zhang School of Atmospheric Sciences Sun Yat-sen University and Key Laboratory of Tropical Atmosphere-Ocean System Ministry of Education Guangdong Provincial Observation and Research Station for Climate Environment and Air Quality Change in the Pearl River Estuary Southern Marine Science and Engineering Guangdong Laboratory (Zhuhai) School of Geo Sciences University of Edinburgh National Centre for Earth Observation University of Edinburgh Laboratory for Climate and Ocean-Atmosphere Studies Department of Atmospheric and Oceanic SciencesSchool of PhysicsPeking University State Key Joint Laboratory of Environmental Simulation and Pollution Control The State Environmental Protection Key Laboratory of Atmospheric Ozone Pollution ControlCollege of Environmental Sciences and Engineering Peking University Jiangsu Key Laboratory of Atmospheric Environment Monitoring and Pollution Control Collaborative Innovation Center of Atmospheric Environment and Equipment Technology School of Environmental Science and Engineering Nanjing University of Information Science &Technology National Institute for Environmental Studies Department of Atmospheric Sciences Yonsei University Department of Geography Hong Kong Baptist University Department of Civil and Environmental Engineering University of California

Ozone pollution is a major environmental threat to human health. Timely assessment of ozone trends is crucial for informing environmental policy. Here we show that for the most recent decade（2013–2022） in the northern hemisphere, warm-season（April–September） mean daily 8-h average maximum ozone increases much faster in urban regions with top ozone levels(mainly in the North China Plain, 1.2 ± 1.3 ppbv year-1) than in other, low-ozone regions(0.2 ± 0.9 ppbv year-1). These trends widen the ozone differences across urban regions, and increase extreme pollution levels and health threats from a global perspective. Comparison of historical trends in different urban regions reveals that ozone increases in China during 2013–2022 differ in magnitude and mechanisms to historical periods in other regions since *** reflects a unique chemical environment characterized by exceptionally high nitrogen oxides and aerosol concentrations, where reducing ozone precursor emissions leads to substantial ozone *** increase in China has slowed down in 2018–2022 compared to 2013–2017, driven by ongoing emission reductions, but with ozone-favorable weather conditions. Historical ozone evolution in Japan and South Korea indicates that ozone increases should be suppressed with continuous emission *** temperature and associated wildfires have also reversed ozone decreases in the USA and Europe,with anthropogenic ozone control slowing down in recent decades.

关键词： air quality surface ozone trends

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Current source and migration of polychlorinated biphenyls(PCBs)since the ban:Bridging field data gap of 209 congeners in China's 23 large lakes

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Emerging Contaminants 2024年第4期10卷 164-173页

作者： Jing Dong Ran Dai Rui Guo Abdul Qadeer Chengyou Liu Xiaoai Cui Yunyu Gao Yaqing Liu Hui Wang Binghui Zheng Xingru Zhao School of Environment Tsinghua UniversityBeijing 100084China National Engineering Laboratory for Lake Pollution Control and Ecological Restoration State Environmental Protection Key Laboratory for Lake Pollution ControlChinese Research Academy of Environmental ScienceBeijing 100012China

Polychlorinated biphenyls(PCBs)were continuously receiving attention after their ban for use and production,owing to significant persistence,transport,and toxicity at trace *** to the field data gap of all 209 PCB congeners in previous studies,the source and environmental migration of lacustrine PCBs were not comprehensively *** this study,209 PCB congeners in 277 water and 155 sediment samples collected from China's 23 large lakes across a longitudinal transect(18-45°N)were *** showed that the concentrations of S209 PCBs were 0.03e41.04 ng/L and 0.26-163.82 ng/g dry weight in lake water and sediment,*** lake water,the dominant PCB congeners,detected in over 50%of all samples,were PCB 11,PCB 28+31,PCB 41+64+68,PCB 47+48+75,and PCB 51,with contributions to ∑_(209) PCBs as 39.8%,6.6%,3.5%,18.4%,and 6.4%,*** appor-tionment revealed that major contributions of PCB 11,41+64+68,47+48+75,51,and 209,were mainly from unintentionally produced PCBs(UP-PCBs)while PCB 28+31 and the other congeners from historical PCB ***,the selective congener analysis(excluding UP-PCBs)common in previous lake studies was an ***,the longitudinal fractionation of PCBs was also found in lake waters,likely caused by the East Asian ***,fugacity fractions of PCBs between water and sediment indicated their overall equilibrium or net ***,PCB 28+31 can be well indicative of PCB *** study provides basic information for the migration and transformation of trace toxic persistent organic pollutants.

关键词： Polychlorinated biphenyls(PCBs) Source Unintentional production Longitudinal fractionation Lakes

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Cleaner geopolymer prepared by co-activation of gasification coal fly ash and steel slag:durability properties and economic assessment

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Frontiers of environmental Science & Engineering 2023年第12期17卷 109-121页

作者： Xian Zhou Xia Chen Ziling Peng Yongmen Zhou Yan Li Wang Jian Zeyu Fan Yuchi Chen Key Laboratory of Geotechnical Mechanics and Engineering of Ministry of Water Resources Changjiang River Scientific Research InstituteWuhan 430010China Jiangxi Research Center on Hydraulic Structures Jiangxi Provincial Institute of Water SciencesNanchang 330029China Key Joint Laboratory of Environment Simulation and Pollution Control School of EnvironmentTsinghua UniversityBeijing 100084China

Geopolymer is a material with high early ***,the insufficient durability properties,such as long-term strength,acid-base resistance,freeze-thaw resistance,leaching toxicity,thermal stability,sulfate resistance and carbonation resistance,restrain its practical ***,a longterm stable geopolymer composite with high final strength(ASK1)was synthesized from shell coal gasification fly ash(SFA)and steel slag(SS).Additionally,a geopolymer composite with high early strength(ASK2)was also synthesized for *** results showed that ASK1 exhibited better performance on freezing-thawing resistance,carbonization resistance and heavy metals stabilization compared to the ASK2 at long-term *** the curing temperature could accelerate the unconfined compressive strength(UCS)development at initial curing ages of 3 to 7 *** ASK1 and ASK2 exhibited excellent acid-base and sulfate corrosion *** increase for UCS was seen under KOH solution and MgSO_(4)solution corrosion for *** leaching concentrations of heavy metals out of the two geopolymers were below the standard threshold,even after 50 freezingthawing *** ASK1 and ASK2 geopolymer concrete exhibited higher sustainability and economic efficiency than Portland cement *** result of this study not only provides a suitable way for the utilization of industrial solid waste in civil and environmental engineering,but also opens a new approach to improve the long-term stabilities of the geopolymers.

关键词： Geopolymer Shell coal gasification fly ash Steel slag Heavy metal Solidification/stabilization Durability

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Quorum sensing regulation methods and their effects on biofilm in biological waste treatment systems: A review

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Frontiers of environmental Science & Engineering 2022年第7期16卷 47-59页

作者： Zhuqiu Sun Jinying Xi Chunping Yang Wenjie Cong Environmental Simulation and Pollution Control State Key Joint Laboratory School of EnvironmentTsinghua UniversityBeijing100084China State Environmental Protection Key Laboratory of Microorganism Application and Risk Control(SMARC) Beijing100084China Guangdong Provincial Key Laboratory of Petrochemical Pollution Processes and Control School of Environmental Science and EngineeringGuangdong University of Petrochemical TechnologyMaoming525099China College of Environmental Science and Engineering Hunan University and Key Laboratory of Environmental Biology and Pollution Control(Hunan University)Ministry of EducationChangsha410082China

Quorum sensing (QS) plays an important role in microbial aggregation control. Recently, the optimization of biological waste treatment systems by QS regulation gained an increasing attention. The effects of QS regulation on treatment performances and biofilm were frequently investigated. To understand the state of art of QS regulation, this review summarizes the methods of QS enhancement and QS inhibition in biological waste treatment systems. Typical QS enhancement methods include adding exogenous QS molecules, adding QS accelerants and cultivating QS bacteria, while typical QS inhibition methods include additions of quorum quenching (QQ) bacteria, QS-degrading enzymes, QS-degrading oxidants, and QS inhibitors. The specific improvements after applying these QS regulation methods in different treatment systems are concluded. In addition, the effects of QS regulation methods on biofilm in biological waste treatment systems are reviewed in terms of biofilm formation, extracellular polymeric substances production, microbial viability, and microbial community. In the end, the knowledge gaps in current researches are analyzed, and the requirements for future study are suggested.

关键词： Quorum sensing Biological waste treatment Biofilm formation

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An embedded ReS_(2)@MAPbBr_(3) heterostructure with downhill interfacial charge transfer for photocatalytic upgrading of biomass-derived alcohols to aldehydes and H_(2)

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Journal of Materials Science & Technology 2024年第12期179卷 155-165页

作者： Tao Shan Yanbo Li Sunzai Ke Bo Su Lijuan Shen Sibo Wang Xuhui Yang Min-Quan Yang College of Environmental and Resource Sciences College of Carbon Neutral Modern IndustryFujian Key Laboratory of Pollution Control&Resource ReuseFujian Normal UniversityFuzhou 350117China State Key Laboratory of Photocatalysis on Energy and Environment College of ChemistryFuzhou UniversityFuzhou 350116China

Solar-driven selective upgrading of lignocellulosic biomass-derived alcohols to value-added chemicals and clean fuel hydrogen(H_(2))shows great potential for tackling the energy crisis and environmental pollu-tion ***,we construct a MAPbBr_(3)/ReS_(2) heterostructure by embedding distorted tetragonal(1T)phase ReS_(2) nanoflowers into large-sized MAPbBr_(3) for green value-added utilization of biomass-derived *** embedded structure effectively enlarges the contact interface between the ReS_(2) and the MAPbBr_(3),and importantly,induces a strong built-in electric field aligned between the spatially well-defined MAPbBr_(3) and ReS_(2) ***,the distorted 1T phase ReS_(2) with low work function well matches the energy band of MAPbBr_(3),forming a heterostructure with a downward band bending at the *** features empower the MAPbBr_(3)/ReS_(2) photocatalyst with high capability to promote charge separation and expedite the surface redox ***,optimal BAD and H_(2) production rates of about 1220 μmol h-1 g-1 are realized over a MAPbBr_(3)/ReS_(2) 2%sample,which are approximately 9 times greater than those of blank MAPbBr_(3).This work demonstrates the great potential of constructing an embedded transition metal dichalcogenide@metal halide perovskites heterostructure with downhill interfacial charge transfer for photocatalytic upgrading of biomass-derived alcohols.

关键词： Heterostructure Downhill interface Biomass-derived alcohols ReS_(2) MAPbBr_(3) H_(2) evolution

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Direct Nano-Imaging Reveals the Underestimated Role of Lanthanum Phosphate Formation in Phosphorus Sequestration by Lanthanum Carbonate

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environmental Science and Technology 2025年第20期59卷 10076-10086页

作者： Li, Yuhang Fu, Wanyi Wan, Yujie Yan, Xing Pan, Bingcai State Key Laboratory of Water Pollution Control and Green Resource Recycling School of Environment Nanjing University Nanjing210023 China Nanjing University Nanjing210023 China

Lanthanum-based materials are recognized as highly effective adsorbents for advanced phosphorus removal, with a prevailing belief that acidic conditions promote phosphorus uptake via enhanced surface complexation. Herein, we demonstrate that lanthanum carbonate exhibits a 1.8-fold higher phosphate adsorption capacity at pH 7 (33.2 mg-P/g) compared to pH 4 (18.5 mg-P/g), attributed to the enhanced formation of LaPO4 nanocrystals. Leveraging in situ atomic force microscopy (AFM), we resolve real-time phosphorus sequestration dynamics, capturing LaPO4 nucleation within minutes, contradicting prior reports that LaPO4 formation is time-intensive. This discrepancy arises because conventional characterization techniques (e.g., X-ray diffraction) overlook transient amorphous LaPO4 intermediates due to insufficient sensitivity, whereas the nanoscale resolution of AFM directly tracks interfacial transformations. A dissolution-nucleation-growth mechanism was then proposed for the interfacial formation of LaPO4. This study revises the mechanistic framework for phosphorus removal and highlights the crucial role of LaPO4 formation in maximizing the utilization efficiency of lanthanum active sites for enhanced phosphate sequestration by La-based materials. © 2025 American Chemical Society.

关键词： Carbonation

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Effects of heterogeneous reaction with NO_(2) on ice nucleation activities of feldspar and Arizona Test Dust

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Journal of environmental Sciences 2023年第5期127卷 210-221页

作者： Lanxiadi Chen Chao Peng Jingchuan Chen Jie Chen Wenjun Gu Xiaohong Jia Zhijun Wu Qiyuan Wang Mingjin Tang State Key Laboratory of Organic Geochemistry Guangdong Key Laboratory of Environmental Protection and Resources UtilizationGuangdong-Hong Kong-Macao Joint Laboratory for Environmental Pollution and ControlGuangzhou Institute of GeochemistryChinese Academy of SciencesGuangzhou 510640China CAS Center for Excellence in Deep Earth Science Guangzhou 510640China University of Chinese Academy of Sciences Beijing 100049China State Key Joint Laboratory of Environmental Simulation and Pollution Control College of Environmental Sciences and EngineeringPeking UniversityBeijing 100871China Key Laboratory of Aerosol Chemistry and Physics State Key Laboratory of Loess and Quaternary GeologyInstitute of Earth EnvironmentChinese Academy of SciencesXi’an 710061China

Mineral dust is an important type of ice nucleating particles in the troposphere;however,the effects of heterogeneous reactions on ice nucleation(IN)activities of mineral dust remain to be elucidated.A droplet-freezing apparatus(Guangzhou Institute of Geochemistry Ice Nucleation Apparatus,GIGINA)was developed in thiswork to measure IN activities of atmospheric particles in the immersion freezingmode,and its performancewas validated by a series of experimental *** apparatus was then employed to measure IN activities of feldspar and Arizona Test Dust(ATD)particles before and after heterogeneous reaction with NO_(2)(10±0.5 ppmv)at 40%relative *** surface coverage of nitrate,θ(NO_(3)^(−)),increased to 3.1±0.2 for feldspar after reaction with NO_(2) for 6 hr,and meanwhile the active site density per unit surface area(ns)at-20℃ was reduced from 92±5 to<1.0 cm^(−2) by about two orders of magnitude;however,no changes in nitrate content or IN activities were observed for further increase in reaction time(up to 24 hr).Both nitrate content and IN activities changed continuously with reaction time(up to 24 hr)for ATD particles;after reaction with NO_(2) for 24 hr,θ(NO_(3)^(−))increased to 1.4±0.1 and ns at-20℃ was reduced from 20±4 to 9.7±1.9 cm^(−2) by a factor of∼*** work suggests that heterogeneous reaction with NO_(2),an abundant reactive nitrogen species in the troposphere,may significantly reduce IN activities of mineral dust in the immersion freezing mode.

关键词： Ice nucleation Mineral dust Heterogeneous reaction Nitrogen oxides Aerosol-cloud interaction

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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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Simultaneous determination of dissolved organic nitrogen, nitrite, nitrate and ammonia using size exclusion chromatography coupled with nitrogen detector

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Journal of environmental Sciences 2023年第3期125卷 309-318页

作者： Wen-Xiang Ji Ye-Chao Tian Min-Hui Cai Bi-Cun Jiang Shi Cheng Yan Li Qing Zhou Bo-Qiang Li Bai-Yang Chen Xing Zheng Wen-Tao Li Ai-Min Li State Key Laboratory of Pollution Control and Resources Reuse School of the EnvironmentNanjing UniversityNanjing 210023China Shenzhen Key Laboratory of Organic Pollution Prevention and Control Harbin Institute of Technology(Shenzhen)Shenzhen 518055China State Key Laboratory of Eco-hydraulics in Northwest Arid Region Xi’an University of TechnologyXi’an 710048China Quanzhou Institute for Environmental Protection Industry Nanjing UniversityQuanzhou 362008China

Accurate quantification of dissolved organic nitrogen(DON) has been a challenge due to the cumulative analytical errors in the conventional method via subtracting dissolved inorganic nitrogen species(DIN) from total dissolved nitrogen(TDN). Size exclusion chromatography coupled with an organic nitrogen detector(SEC-OND) has been developed as a direct method for quantification and characterization of DON. However, the applications of SECOND method still subject to poor separations between DON and DIN species and unsatisfied N recoveries of macromolecules. In this study, we packed a series of SEC columns with different lengths and resin materials for separation of different N species and designed an independent vacuum ultraviolet(VUV) oxidation device for complete oxidation converting N species to nitrate. To guarantee sufficient N recoveries, the operation conditions were optimized as oxidation time ≥ 30 min, injection mass(sample concentration × injection volume) < 1000 μL × mg-N/L for macromolecular proteins, and neutral p H mobile eluent. The dissolved O_(2)concentration in SEC mobile phase determined the upper limit of VUV oxidation at a specific oxidation time. Compared to conventional HW50S column(20 × 250 mm),HW40S column(20 × 350 mm) with mobile phase comprising of 1.5 g/L Na2HPO_(4)·2H_(2)O + 2.5g/L KH_(2)PO_(4)(p H = 6.85) could achieve a better separation of DON, nitrite, nitrate, and ammonia. When applied to river water, lake water, wastewater effluent, groundwater, and landfill leachate, the SEC-OND method could quantify DON as well as DIN species accurately and conveniently even the DIN/TDN ratio reached 0.98.

关键词： Size exclusion chromatography Nitrogen detector Dissolved organic nitrogen Nitrate Nitrite Ammonia

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