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Coupling magnetic particles with flocculants to enhance demulsification and separation of waste cutting emulsion for engineering applications

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Journal of Environmental Sciences 2021年第7期33卷 173-183页

作者： Yongjiao Xiong Baoqiang Wu Xiangfeng Huang Chenlu Li Bin Lu Jia Liu Lijun Lu Shiyang Li Kaiming Peng College of Environmental Science and Engineering State Key Laboratory of Pollution Control and Resource ReuseMinistry of Education Key Laboratory of Yangtze River Water EnvironmentShanghai Institute of Pollution Control and Ecological SecurityTongji UniversityShanghai 200092China

Magnetic particles were coupled with a flocculant to enhance the demulsification and separation of waste cutting *** optimal magnetic particle size and critical magnetic field conditions were investigated to achieve large-scale engineering application of magnetic demulsification separation for waste cutting emulsion *** micro-scale magnetic particles were found to show comparable effects to nano-scale magnetic particles on enhancing the demulsification and separation of cutting emulsions,which are beneficial for broadening the selectivity of low-cost magnetic *** critical magnetic separation region was determined to be an area 40 mm from the magnetic field *** to the flocculant demulsification,the magnetic demulsification separation exhibited a significant advantage in accelerating flocs-water separation by decreasing the separation time of flocs from 180-240 min to less than 15 min,compressing the flocs by reducing the floc volume ratio from 60%-90%to lower than 20%,and showing excellent adaptability to the variable properties of waste cutting *** with the design of the magnetic disk separator,continuous demulsification separation of the waste cutting emulsion was achieved at 1.0 t/hr for at least 10 hr to obtain clear effluent with 81%chemical oxygen demand removal and 89%turbidity *** study demonstrates the feasibility of applying magnetic demulsification separation to large-scale continuous treatment of waste ***,it addresses the flocs-water separation problems that occur in practical flocculant demulsification engineering applications.

关键词： Waste cutting emulsion Magnetic particles Demulsification and separation Magnetic disk separator Large-scale treatment

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Cotransport of nanoplastics with nZnO in saturated porous media:From brackish water to seawater

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Journal of Environmental Sciences 2025年第2期148卷 541-552页

作者： Yuanzhang Hou Yange Wang Yidi Zhang Zhibo Lu Zhenbo Zhang Zhiqiang Dong Yuping Qiu Department of Environmental Science College of Environmental Science and EngineeringTongji UniversityState Key Laboratory of Pollution Control and Resources ReuseShanghai Institute of Pollution Control and Ecological SecurityShanghai 200092China School of Medicine Tongji UniversityShanghai 200065China Municipal Environmental Protection Engineering Co. Ltd of CERC Shanghai GroupShanghai 201906China China Railway Engineering Group Co. Beijing 100039China

The ocean serves as a repository for various types of artificial ***(NPs)and nano zinc oxide(nZnO),which are frequently employed in personal care products and food packaging materials,are likely simultaneously released and eventually into the ocean with surface ***,their mutual influence and shared destiny in marine environment cannot be *** study examined how nanomaterials interacted and transported through sea sand in various salinity *** showed that NPs remained dispersed in brine,while nZnO formed *** seawater of 35 practical salinity units(PSU),nZnO formed heteroaggregates with NPs,inhibiting NPs mobility and decreasing the recovered mass percentage(Meff)from 24.52%to 12.65%.In 3.5 PSU brackish water,nZnO did not significantly aggregate with NPs,and thus barely affected their ***,NPs greatly enhanced nZnO transport with Meff increasing from 14.20%to 25.08%,attributed to the carrier effect of higher mobility *** from brackishwater to seawater was simulated in salinity change experiments and revealed a critical salinity threshold of 10.4 PSU,below which the mobility of NPs was not affected by coexisting nZnO and above which nZnO strongly inhibited NP *** study highlights the importance of considering the mutual influence and shared destiny of artificial nanoparticles in the marine environment and how their interaction and cotransport are dependent on changes in seawater salinity.

关键词： Homoaggregate Heteroaggregate Transport Sea sand Salinity threshold

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High-solid anaerobic digestion of sewage sludge:achievements and perspectives

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Frontiers of Environmental Science & Engineering 2021年第4期15卷 1-18页

作者： Ying Xu Hui Gong Xiaohu Dai State Key Laboratory of Pollution Control and Resource Reuse School of Environmental Science and EngineeringTongji UniversityShanghai200092China Shanghai Institute of Pollution Control and Ecological Security Shanghai200092China

High-solid anaerobic digestion(HS-AD)has been applied extensively during the last few decades for treating various organic wastes,such as agricultural wastes,organic fractions of municipal solid wastes,and kitchen ***,the application of HS-AD to the processing of sewage sludge(SS)remains limited,which is largely attributable to its poor process stability and *** research has been conducted to attempt to surmount these *** this review,the main factors affecting process stability and performance in the HS-AD of SS are comprehensively reviewed,and the improved methods in current use,such as HS sludge pre-treatment and anaerobic co-digestion with other organic wastes,are ***,this paper also discusses the characteristics of substance transformation in the HS-AD of SS with and without thermal *** has shown that the HS effect is due to the presence of high concentrations of substances that may inhibit the function of anaerobic microorganisms,and that it also results in poor mass transfer,a low diffusion coefficient,and high ***,knowledge gaps in the current research on HS-AD of SS are *** on these,it proposes that future efforts should be devoted to standardising the definition of HS sludge,revealing the law of migration and transformation of pollutants,describing the metabolic pathways by which specific substances are degraded,and establishing accurate mathematical ***,developing green sludge dewatering agents,obtaining high value-added products,and revealing effects of the above two on HS-AD of SS can also be considered in future.

关键词： High-solid effect Anaerobic fermentation Methane production Biodegradability Sludge treatment

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In situ polymerized quasi-solid polymer electrolytes enabling void-free interfaces for room-temperature sodium-sulfur batteries

Energy Materials and Devices

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Energy Materials and Devices 2024年第4期2卷 67-77页

作者： Jiafang Huang Zhengguang Song Junxiong Wu Yuhui Miao Manxian Li Danjing Lin Kai Zhu Xiaochuan Chen Xiaoyan Li Yuming Chen Engineering Research Center of Polymer Green Recycling of Ministry of Education Fujian Key Laboratory of Pollution Control&Resource ReuseCollege of Environmental and Resource Sciences and College of Carbon Neutral Modern IndustryFujian Normal UniversityFuzhou 350117China

Rechargeable room-temperature(RT)sodium–sulfur(Na–S)batteries hold great potential for large-scale energy storage owing to their high energy density and low ***,their practical application is hindered by challenges such as polysulfide shuttling and Na dendrite *** this study,a dual salt-based quasi-solid polymer electrolyte(DS–QSPE)was developed via in situ polymerization,achieving high ionic conductivity(4.8×10^(-4) S·cm^(-1) at 25°C),a high sodium-ion transference number(0.73),and effective polysulfide *** calculations and experimental results indicate that the enhanced Na-ion transport is attributed to the strengthened coordination of anions with the polydioxolane chain and the increased dissociation of sodium ***,the DS–QSPE forms an interconnected network structure in the sulfurized polyacrylonitrile(SPAN)*** provides abundant and seamless electrochemical reaction interfaces that facilitate efficient and uniform ion transport *** a result,the Na||SPAN battery with DS–QSPE delivers a high capacity of approximately 327.4 mAh·g^(-1)(based on the mass of SPAN)after 200 cycles at 0.2 A·g^(-1),retaining 81.4%of its initial *** performance considerably surpasses that of batteries using liquid *** study offers a straightforward approach to addressing the inter-facial challenges in solid-state Na–S batteries.

关键词： sodium–sulfur batteries sulfurized polyacrylonitrile in situ polymerization quasi-solid polymer electrolyte shuttle effect

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Red mud-based catalysts for the catalytic removal of typical air pollutants: A review

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Journal of Environmental Sciences 2023年第5期127卷 628-640页

作者： Jiawei Chen YaoWang Zhiming Liu State Key Laboratory of Chemical Resource Engineering Beijing University of Chemical TechnologyBeijing 100029China Beijing Center for Environmental Pollution Control and Resource Recovery Beijing University of Chemical TechnologyBeijing 100029China Beijing Key Laboratory of Energy Environmental Catalysis Beijing University of Chemical TechnologyBeijing 100029China

Red mud,as a solid waste produced during the alumina production,can cause severe ecoenvironmental pollution and health risks to ***,the resourcing of this type of solid waste is an effective way for the sustainable *** paper reviews the recent progress on red mud-based catalysts for the removal of typical air pollutants,such as the catalytic reduction of nitrogen oxides(NO_(x))by NH_(3)(NH_(3)-SCR)and the catalytic oxidation of CO and volatile organic compounds(VOCs).The factors influencing the catalytic performance and the structure–activity relationship have been *** prospects and directions for the development of such catalysts are also *** review would benefit for the high value-added utilizations of red mud in mitigating atmospheric pollutions.

关键词： Red mud Catalyst NH_(3)-SCR Catalytic oxidation Air pollutants

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Research progress of nitrate removal technologies based on photoelectrochemical reduction

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Zhongguo Huanjing Kexue/China Environmental Science 2025年第4期45卷 1878-1888页

作者： Huang, Tian-Rong Wang, Kai-Chong Li, Zi-Bin Li, Dan-Ping Wang, Han Wang, Ya-Yi School of Environmental Science and Engineering Tongji University Shanghai200092 China State Key Laboratory of Pollution Control and Resource Reuse Tongji University Shanghai200092 China

As a common pollutant in water, nitrate has nonnegligible harmful effects on human health and the ecological environment. Faced with an increasingly severe energy crisis, the development of green, clean and sustainable nitrate removal technologies to replace the conventional resource-intensive denitrification process is urgently needed. Photoelectrochemical nitrate reduction powered by sunlight has become a research hotspot at home and abroad. Based on the way photogenerated electrons being transferred from semiconductor to nitrate, this technology can be categorized into photocatalytic reduction, photoelectrocatalytic reduction, and microbial photoelectrotrophic reduction. In this review, the mechanisms of three photoelectrochemical nitrate reduction technologies were discussed. With a focus on improving system performance, the selection and design strategies of photocatalysts, photoelectrodes and microbial photosensitizers were also summarized. Moreover, the technical difficulties of photoelectrochemical nitrate reduction are clarified and the future directions of research are proposed, such as regulating the pathway of microbial absorption and utilization of photogenerated electrons through genetic engineering and other methods. The insights provided will serve as a reference for the development of new nitrate removal and reutilization technologies. © 2025 Chinese Society for Environmental Sciences. All rights reserved.

关键词： Sustainable development

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Coastal mudflats as reservoirs of extracellular antibiotic resistance genes: Studies in Eastern China

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Journal of Environmental Sciences 2023年第7期129卷 58-68页

作者： Qingbin Yuan Xiaolin Wang Hui Fang Yuan Cheng Ruonan Sun Yi Luo College of Environmental Science and Engineering Nanjing Tech UniversityNanjing 211816China State Key Laboratory of Pollution Control and Resource Reuse School of the EnvironmentNanjing UniversityNanjing 210023China School of Medicine Nankai UniversityTianjin 300071China Department of Civil and Environmental Engineering Rice UniversityHouston 77005USA

Despite coastal mudflats serving as essential ecological zones interconnecting terrestrial/freshwater and marine systems,little is known about the profiles of antibiotic resistance genes(ARGs)in this *** this study,characteristics of typical ARGs,involving both intracellular(iARGs)and extracellular ARGs(eARGs)at different physical states,were explored in over 1000 km of coastal mudflats in Eastern *** indicated the presence of iARGs and eARGs at states of both freely present or attached by *** abundance of eARGs was significantly higher than that of iARGs(87.3%vs 12.7%),and their dominance was more significant than those in other habitats(52.7%-76.3%).ARG abundance,especially for eARGs,showed an increasing trend(p<0.05)from southern(Nantong)to northern(Lianyungang)*** salinity facilitated the transformation from iARGs to eARGs,and smaller soil particle size was conducive to the persistence of eARGs in northern coastal *** study addresses the neglected function of coastal mudflats as eARGs reservoirs.

关键词： Antibiotic resistance genes(ARGs) Extracellular antibiotic resistance genes(eARGs) Coastal mudflats Amplicon sequencing Geochemical variable Mobile genetic elements

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Synthetic Cu(Ⅲ)from copper plating wastewater for onsite decomplexation of Cu(Ⅱ)-and Ni(Ⅱ)-organic complexes

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Chinese Chemical Letters 2025年第2期36卷 470-475页

作者： Junyi Yu Yin Cheng Anhong Cai Xianfeng Huang Qingrui Zhang National and Local Joint Engineering Research Center for Ecological Treatment Technology of Urban Water Pollution College of Life and Environmental ScienceWenzhou UniversityWenzhou 325035China State Key Laboratory of Metastable Materials Science and Technology Hebei Key Laboratory of Heavy Metal Deep-Remediation in Water and Resource ReuseSchool of Environmental and Chemical EngineeringYanshan UniversityQinhuangdao 066004China

Herein,the Cu(Ⅲ)synthesized from copper plating effluent was developed for the first time to evaluate the onsite degradation performance of heavy metal complexes in the wastewater,thus achieving the purpose of“treating waste with waste”.The results indicated that synthetic Cu(Ⅲ)presented the excellent decomplexation performance for Cu(Ⅱ)/Ni(Ⅱ)-organic *** removal efficiency of Cu(Ⅱ)/Ni(Ⅱ)-EDTA significantly increased with increasing Cu(Ⅲ)dosage,and the degradation of Cu(Ⅱ)/Ni(Ⅱ)-EDTA by synthetic Cu(Ⅲ)system displayed highly p H-dependent *** radical quencher experiments confirmed that Cu(Ⅲ)direct oxidation were mainly involved in the degradation of Cu(Ⅱ)-***,the continuous decarboxylation process was proven to be the main degradation pathway of Cu(Ⅱ)-EDTA in Cu(Ⅲ)*** coexisting substances(SO42-,Cl-and fulvic acids)showed little impacts at low level for the removal of Cu(Ⅱ)/Ni(Ⅱ)-EDTA,while retarded the degradation of Cu(Ⅱ)-EDTA slightly at high level,which features high selective ***,it was also effective to remove Cu(Ⅱ)/Ni(Ⅱ)-EDTA from in treating actual Cu/Ni-containing wastewater through synthetic Cu(Ⅲ)treatment.

关键词： Copper plating wastewater Cu(III) Decomplexation Treating waste with waste Selectivity

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Interactions between methyl octabromo ether flame retardant and expanded polystyrene microplastics in the photoaging process

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Chemosphere 2024年 358卷 142165页

作者： Shi, Yanqi Zheng, Lezhou Huang, Hexinyue Shi, Linping Gong, Zhimin Ye, Kefu Chen, Xingqi Gao, Shixiang State Key Laboratory of Pollution Control and Resource Reuse School of the Environment Nanjing University Jiangsu Nanjing210093 China

Expanded polystyrene (EPS) plastic is widely used because of its low density and lightweight properties, enabling it to float on water and increase its exposure to sunlight. In this study, we simulated the photoaging process of flame retardant-added EPS (FR-EPS) and common original EPS (OR-EPS) microplastic (MP) particles with and without methyl octabromoether flame retardant (MOBE) in the laboratory to explore the effect of MOBE on the photodegradation of EPS. Results showed that MOBE accelerated size reduction and surface hole formation on the particles, hastening the shedding and replacement of particle surfaces. FR-EPS particles exhibited a weight loss exceeding that of OR-EPS, reaching 40.85 ± 3.72% after 36 days of irradiation. Moreover, rapid physical peeling of the FR-EPS surface was accompanied by continuous chemical oxidation and fluctuations of the carbonyl index and O/C ratio. A diffusion model based on Fick's second law fitted well for the concentration of MOBE remaining in FR-EPS particles. MOBE's sensitivity to direct photochemical reactions inhibited the early-stage photoaging of EPS MP particles by competing for photons. However, MOBE as chromophores could absorb photons and produce •OH to promote the aging of EPS. Moreover, the capacity of EPS to absorb light energy also accelerated MOBE degradation. These findings suggested that the photoaging behavior of commercial EPS products containing flame retardants in the environment is quite different from that of pure EPS, indicating that additive-plastic interactions significantly alter MP fate and environmental risks. © 2024 Elsevier Ltd

关键词： Microplastic

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Interface-induced charge transfer pathway switching of a Cu_(2)O-TiO_(2)photocatalyst from p-n to S-scheme heterojunction for effective photocatalytic H_(2)evolution

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Journal of Materials Science & Technology 2024年第26期193卷 98-106页

作者： Kaihui Huang Guijie Liang Shaolong Sun Haobin Hu Xiaoming Peng Rongchen Shen Xin Li Institute of Biomass Engineering Key Laboratory of Energy Plants Resource and UtilizationMinistry of Agriculture and Rural AffairsSouth China Agricultural UniversityGuangzhou 510642China Hubei Key Lab Low Dimens Optoelect Mat&Devices Hubei University of Arts and ScienceXiangyang 441053China College of Natural Resources and Environment South China Agricultural UniversityGuangzhou 510642China Key Laboratory of Efficient Utilization of Oil and Gas Resources in Longdong College of Petroleum and Chemical EngineeringLongdong UniversityQingyang 745000China State Key Laboratory of Pollution Control and Resource Reuse School of the EnvironmentNanjing UniversityNanjing 210023China

Photocatalytic hydrogen evolution from water splitting is an appealing method for producing clean chemical ***_(2)O,with a suitable bandgap,holds promise as a semiconductor for this ***,the strong photo-corrosion and rapid charge recombination of Cu_(2)O strongly limit its application in the photocatalytic ***,an S-scheme heterojunction photocatalyst composed of TiO_(2)and Cu_(2)O was rationally designed to effectively avoid the photo-corrosion of Cu_(2)*** introduction of an interfacial nitrogen-doped carbon(NC)layer switches the heterojunction interfacial charge transfer pathway from the p-n to S-scheme heterojunction,which avoids excessive accumulation of photogenerated holes on the surface of Cu_(2)***,the hybrid structure shows a broad spectral response(300-800 nm)and efficient charge separation and transfer ***,the highest photocatalytic hydrogen evolution rate of TiO_(2)-NC-3%Cu_(2)O-3%Ni is 13521.9μmol g^(-1)h^(-1),which is approximately 664.1 times higher than that of pure Cu_(2)***-situ X-ray photoelectron spectroscopy and Kelvin probe confirm the charge transfer mechanism of S-scheme *** formation of S-scheme heterojunctions effectively accelerates the separation of photogenerated electron-hole pairs and enhances redox capacity,thereby improving the photocatalytic performance and stability of Cu_(2)*** study provides valuable insights into the rational design of highly efficient Cu_(2)O-based heterojunction photocatalysts for hydrogen production.

关键词： Photocatalytic hydrogen evolution Cu_(2)O S-scheme heterojunction Charge separation mechanism Nitrogen doped carbon

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