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Appropriate solid waste management system in Quelimane (Mozambique):study and design of a small-scale center for plastic sorting with Wastewater treatment

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Waste Disposal and Sustainable Energy 2022年第1期4卷 49-62页

作者： Francesca Villa Giovanni Vinti Mentore Vaccari Department of Civil and Environmental Engineering(DICA) Politecnico di MilanoVia Golgi 3920133 MilanItaly Laboratory Centre on Appropriate Technologies for Environmental Management in Resource-Limited Countries(CeTAmb LAB) University of BresciaVia BranzeBresciaItaly

Appropriate solid waste management(SWM)strategies are necessary to avoid severe environmental and sanitary impacts,especially in low-income countries.Such strategies are most likely to succeed whether implementing actors are supported by scientific research.In this paper,the results of a collaboration between local authorities and researchers are presented and discussed that are the assessment of waste generation in the city of Quelimane(Mozambique),integrating existing and field-collected data and the design of a small-scale center for plastic sorting to complement the SWM system of the city.The center is expected to receive about 0.3-0.4 t/day of plastic waste(5%-7%of the overall amount of plastic waste daily produced in Quelimane).As long-term sustainability represents a typical issue,simplicity of operation was a leading principle in the design of the center;moreover,the design included a treatment plant(WWTP)for generated wastewater,whose management is usually neglected in such interventions.Among others,natural Wastewater treatment(constructed wetlands)has been chosen for its affordability.Noteworthy,the so-conceived WWTP appears as a novelty in the scientific literature associated with small-scale plastic sorting plants.The system is designed to treat an average flow of 6 m3/day and consisted of a septic tank followed by a subsurface flow constructed wetland.Overall,the COD(chemical oxygen demand)and TSS(total suspended solids)removal higher than 80%and 90%were estimated,respectively.Based on this work,both the center and the WWTP were successfully realized,which are waiting to become operational.In the authors’opinion,the implemented procedure could become a reference for broader investigations and surveys.

关键词： Low-income countries Wastewater treatment Plastic recycling Informal sector Waste collection

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Wastewater treatment using Fe-doped perovskite manganites by photocatalytic degradation of methyl orange,crystal violet and indigo carmine dyes in tungsten bulb/sunlight

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稀土学报:英文版 2023年第9期41卷 1311-1322,I0002页

作者： Brajendra Singh Priyanka Singh Saiqua Siddiqui Divyanshu Singh Mukul Gupta Materials Chemistry Lab Centre of Material SciencesUniversity of AllahabadPrayagraj21002India UGC-DAE Consortium for Scientific Research University CampusKhandwa Road Indore452001India

We documented(ⅰ) the decolorization of wastewater in visible light,which contains methyl orange,crystal violet and indigo carmine dyes,using La_(0.7)Sr_(0.3)Mn_(1-x)Fe_(x)O_(3)(x=0.0,0.05,0.1 and 0.5) manganites and(ⅱ) efficient separation of photocatalysts from water using magnetic field.These ceramic photocatalysts were sintered at 1050℃ for 12 h.Ceramics were characterized by X-ray diffraction(XRD),soft X-ray absorption spectroscopy(SXAS),Fourier transform infrared spectroscopy(FTIR) and UV-visible diffuse reflectance spectroscopy(DRS).SXAS studies show the presence of Mn(Mn^(3+)/Mn^(4+)) and Fe(Fe^(3+)/Fe^(4+)) mixes valences in Fe-doped compositions.Optical band gap is found in visible light range for La_(0.7)Sr_(0.3)Mn_(1-x)Fe_(x)O_(3)(x=0.0,0.05,0.1) compositions.La_(0.7)Sr_(0.3)MnO_(3) degrades 94.6% methyl orange in7 min,81.9% crystal violet in 10 min and 99.1% indigo carmine in 5 min.La_(0.7)Sr_(0.3)Mn_(0.9)Fe_(0.1)O_(3) degrades the 92.6% methyl orange dye solution in 9 min,94.8% crystal violet in 25 min and 97.1% indigo carmine in3 min.Parent and Fe doped manganites can be separated in 60 s from wastewater.

关键词： Synchrotron X-ray absorption Dye degradation Magnetic separation Mixed valences Rare earths Wastewater treatment

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Mass-producible low-cost flexible electronic fabrics for azo dye Wastewater treatment by electrocoagulation

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中国化学工程学报:英文版 2023年第7期59卷 222-230页

作者： Chaoyi Yin Jingyuan Ma Jian Qiu Ruifang Liu Long Ba State Key Laboratory of Bioelectronics School of Biological Science and Medical Engineering Southeast UniversityNanjing 210096China State Key Laboratory of Materials-Oriented Chemical Engineering National Engineering Research Center for Special Separation MembraneCollege of Chemical EngineeringNanjing Tech UniversityNanjing 210009China

Electrocoagulation is progressively becoming an ecologically friendly water treatment method owing to its lack of secondary pollution,high active ingredient concentration,high treatment effectiveness,simple equipment,and simplicity of automated control implementation.Herein,electrocoagulation is offered as a method for treating wastewater containing azo dyes using a revolutionary flexible electronic fabric that can be mass-producible at a reasonable price.A computer-controlled machine embroiders 316L stainless steel fiber(316L SSF)onto an insulating fabric to manufacture a flexible electronic device of cathode and anode with a monopolar arrangement on the fabric surface.Using methyl orange(MO)solution to simulate azo dye wastewater,the decolorization rate of 500 ml MO reached 99.25% under the conditions of 50 mg·L^(-1)initial mass concentration,120 min electrolysis time,15 mA·g^(-1)current density,1 cm electrode spacing,0.1 mol·L^(-1)NaCl,pH 7.6,200 r·min^(-1)rotational speed of the stirrer,and 22-25℃ room temperature.In addition,it is feasible to embroider flexible electronic fabrics with varied sizes and numbers of electrodes based on the amount of treated sewage to increase the degradation rate,which has significant practical application value.

关键词： Flexible electronic fabric 316L Stainless steel fiber Embroidery Electrocoagulation Wastewater treatment

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Life cycle assessment of high concentration organic Wastewater treatment by catalytic wet air oxidation

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Chinese Journal of Chemical Engineering 2023年第4期56卷 80-88页

作者： Yuxi Chai Yanan Zhang Yannan Tan Zhiwei Li Huangzhao Wei Chenglin Sun Haibo Jin Zhao Mu Lei Ma Beijing Key Laboratory of Fuels Cleaning and Advanced Catalytic Emission Reduction Technology/College of New Materials and Chemical Engineering Beijing Institute of Petrochemical TechnologyBeijing 102617China Dalian Institute of Chemical Physics Chinese Academy of SciencesDalian 116023China School of Chemistry and Chemical Engineering Hefei University of TechnologyHefei 230009China Institute of Applied Chemical Technology for Oilfield/College of New Materials and Chemical Engineering Beijing Institute of Petrochemical TechnologyBeijing 102617China

There have been many studies on life cycle assessment in sewage treatment,but there are scarce few studies on the treatment of industrial wastewater in combination with advanced oxidation technology,especially in catalytic wet air oxidation(CWAO).There are no cases of using actual industrialized data onto life cycle assessment.This paper uses Simapro 9.0 software to establish a life cycle assessment model for the treatment of high-concentration organic wastewater by CWAO,and comprehensively explains the impact on the environment from three aspects:the construction phase,the operation phase and the demolition phase.In addition,sensitivity analysis and uncertainty analysis were performed.The results showed that the key factors affecting the environment were marine ecotoxicity,mineral resource consumption and global warming,the operation stage had the greatest impact on the environment,which was related to high power consumption during operation and emissions from the treatment process.Sensitivity analysis showed that electricity consumption has the greatest impact on abiotic depletion and freshwater aquatic ecotoxicity,and it also proved that global warming is mainly caused by pollutant emissions during operation phase.Monte Carlo simulations found slightly higher uncertainty for abiotic depletion and toxicity-related impact categories.

关键词： Wastewater treatment High-concentration organic wastewater Catalytic wet air oxidation Life-cycle assessment

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A review on the forward osmosis applications and fouling control strategies for Wastewater treatment

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Frontiers of Chemical Science and Engineering 2022年第5期16卷 661-680页

作者： Linwei Zhu Chun Ding Tengyang Zhu Yan Wang Key Laboratory of Material Chemistry for Energy Conversion and Storage(Huazhong University of Science and Technology) Ministry of EducationWuhan 430074China Hubei Key Laboratory of Material Chemistry and Service Failure School of Chemistry and Chemical EngineeringHuazhong University of Science and TechnologyWuhan 430074China

During the last decades,the utilization of osmotic pressure-driven forward osmosis technology for Wastewater treatment has drawn great interest,due to its high separation efficiency,low membrane fouling propensity,high water recovery and relatively low energy consumption.This review paper summarizes the implementation of forward osmosis technology for various Wastewater treatment including municipal sewage,landfill leachate,oil/gas exploitation wastewater,textile wastewater,mine wastewater,and radioactive wastewater.However,membrane fouling is still a critical issue,which affects water flux stability,membrane life and operating cost.Different membrane fouling types and corresponding fouling mechanisms,including organic fouling,inorganic fouling,biofouling and combined fouling are therefore further discussed.The fouling control strategies including feed pre-treatment,operation condition optimization,membrane selection and modification,membrane cleaning and tailoring the chemistry of draw solution are also reviewed comprehensively.At the end of paper,some recommendations are proposed.

关键词： forward osmosis Wastewater treatment membrane fouling fouling control

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Well-structured 3D channels within GO-based membranes enable ultrafast Wastewater treatment

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Nano Research 2023年第2期16卷 1826-1834页

作者： Huaqiang Fu Zhe Wang Peng Li Wei Qian Zixin Zhang Xin Zhao Hao Feng Zhugen Yang Zongkui Kou Daping He School of Materials Science and Engineering Wuhan University of TechnologyWuhan 430070China Hubei Engineering Research Center of RF-Microwave Technology and Application School of ScienceWuhan University of TechnologyWuhan 430070China State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhan 430070China School of Water Energy and EnvironmentCranfield UniversityCranfield MK430ALUK

Graphene oxide(GO)-based membranes have been widely studied for realizing efficient Wastewater treatment,due to their easily functionalizeable surfaces and tunable interlayer structures.However,the irregular structure of water channels within GO-based membrane has largely confined water permeance and prevented the simultaneously improvement of purification performance.Herein,we purposely construct the well-structured three-dimensional(3D)water channels featuring regular and negatively-charged properties in the GO/SiO_(2)composite membrane via in situ close-packing assembly of SiO_(2)nanoparticles onto GO nanosheets.Such regular 3D channels can improve the water permeance to a record-high value of 33,431.5±559.9 L·m^(−2)·h−1(LMH)bar−1,which is several-fold higher than those of current state-of-the-art GO-based membranes.We further demonstrate that benefiting from negative charges on both GO and SiO2,these negatively-charged 3D channels enable the charge selectivity well toward dye in wastewater where the rejection for positive-charged and negative-charged dye molecules is 99.6%vs.7.2%,respectively.The 3D channels can also accelerate oil/water(O/W)separation process,in which the O/W permeance and oil rejection can reach 19,589.2±1,189.7 LMH bar−1 and 98.2%,respectively.The present work unveils the positive role of well-structured 3D channels on synchronizing the remarkable improvement of both water permeance and purification performance for highly efficient Wastewater treatment.

关键词： graphene oxide membranes Wastewater treatment water channels charge-selectivity

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Non-thermal plasma enhances performances of biochar in Wastewater treatment and energy storage applications

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Frontiers of Chemical Science and Engineering 2022年第4期16卷 475-483页

作者： Rusen Zhou Xiaoxiang Wang Renwu Zhou Janith Weerasinghe Tianqi Zhang Yanbin Xin Hao Wang Patrick Cullen Hongxia Wang Kostya(Ken)Ostrikov College of Environmental Science and Engineering Dalian Maritime UniversityDalian 116026China School of Chemistry and Physics and QUT Centre for Materials Science Queensland University of TechnologyQLD 4000Australia School of Chemical and Biomolecular Engineering The University of SydneyNSW 2006Australia Centre for Future Materials University of Southern QueenslandQLD 4350Australia

Surface functionalization or modification to introduce more oxygen-containing functional groups to biochar is an effective strategy for tuning the physicochemical properties and promoting follow-up applications.In this study,non-thermal plasma was applied for biochar surface carving before being used in contaminant removal and energy storage applications.The results showed that even a low dose of plasma exposure could introduce a high number density of oxygen-functional groups and enhance the hydrophilicity and metal affinity of the pristine biochar.The plasma-treated biochar enabled a faster metal-adsorption rate and a 40%higher maximum adsorption capacity of heavy metal ion Pb^(2+).Moreover,to add more functionality to biochar surface,biochar with and without plasma pre-treatment was activated by KOH at a temperature of 800℃.Using the same amount of KOH,the plasma treatment resulted in an activated carbon product with the larger BET surface area and pore volume.The performance of the treated activated carbon as a supercapacitor electrode was also substantially improved by>30%.This study may provide guidelines for enhancing the surface functionality and application performances of biochar using non-thermal-based techniques.

关键词： non-thermal plasma surface functionalization biochar modification Wastewater treatment supercapacitor

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Effect of the chloride ion on advanced oxidation processes catalyzed by Fe-based metallic glass for Wastewater treatment

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Journal of Materials Science & Technology 2022年第22期117卷 49-58页

作者： Shuangqin Chen Mai Li Qingmin Ji Tao Feng Si Lan KeFu Yao School of Material Science and Engineering Herbert Gleiter Institute of NanoscienceNanjing University of Science and TechnologyNanjing 210094China School of Material Science and Engineering Tsinghua UniversityBeijing 100084China School of Material Science and Engineering Nanjing Institute of TechnologyNanjing 211167China

Fe-based metallic glasses (Fe–MGs) are potential candidate catalysts for advanced oxidation processes(AOPs) for recalcitrant organic pollutant degradation. However, industrial wastewater and natural contaminated sites usually contain abundant inorganic ions, like the chloride ion (Cl−), which significantly affectAOPs, but their influence on MG-activated AOPs still remains unclear. Through the study of three commonly used oxidants, hydrogen peroxide (H_(2)O_(2)), peroxydisulfate (PDS), and peroxymonosulfate (PMS), theeffect of Cl− on the FeSiB-catalyzed process of degradation of the typical azo dye Orange Ⅱ was investigated. Evidence indicates that the addition of Cl− resulted in the monotonous inhibition of the degradation process when the H_(2)O_(2)/FeSiB and PDS/FeSiB systems were employed, but promoted effect wasdetected with the PMS/FeSiB system, which is different from the previously observed dual effect of Cl−.It is closely relative with FeSiB induced unique variety of degradation pathways, including radicals, nonradicals (^(1)O_(2)), and direct reduction degradation. Moreover, the presence of Cl− significantly affected thesystems’ absorbable organic halogen content and the amount of Fe leached into the solution. The resultsof this work will provide essential references for Fe-based MG used as AOP catalysts in field applicationsand the development of advanced MGs with excellent adaptability to complex environments.

关键词： Fe-based metallic glass Advanced oxidation processes Wastewater treatment Chlorine ion

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Nanozyme:A promising tool from clinical diagnosis and environmental monitoring to Wastewater treatment

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Particuology 2022年第12期71卷 90-107页

作者： Chaoyi Hong Xiangqin Meng Jiuyang He Kelong Fan Xiyun Yan CAS Engineering Laboratory for Nanozyme Key Laboratory of Protein and Peptide PharmaceuticalInstitute of BiophysicsChinese Academy of SciencesBeijing 100101China School of Future Technology University of Chinese Academy of SciencesBeijing 101408China Nanozyme Medical Center School of Basic Medical SciencesZhengzhou UniversityZhengzhou 450052China

Natural enzymes,owing to their outstanding catalytic efficiency and substrate specificity,have been used in a variety of applications including clinical diagnosis,environmental monitoring and Wastewater treatment.However,they face inevitable problems such as relatively high cost and lack of stability,dramatically hindering their practical applications in the industry.Recently,a class of nanomaterial that possesses intrinsic enzyme-like properties,nanozyme,has emerged exhibiting numerous advantages over its natural counterpart and has been used as a viable enzyme alternative.In the past decade there are many reviews on nanozyme.The previous discussions tend to view nanozyme as a type of nanomaterial rather than an enzyme.However,it is the enzyme-like activity of nanozymes that provides foundation for their application and nanozymes with the same enzymatic activity usually have some regularity in application.Herein,in this review,we attempt to classify nanozymes by their enzyme-like activity to explain the application principle and relevant cases of nanozymes in clinical diagnosis,environmental monitoring and Wastewater treatment,expecting to promote deeper thinking of nanozymes as enzyme mimics and provide useful guidance for future research.

关键词： Nanozyme Enzymatic activity Clinical diagnosis Environmental monitoring Wastewater treatment

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Occurrence and Roles of Comammox Bacteria in Water and Wastewater treatment Systems:A Critical Review

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Engineering 2022年第10期17卷 196-206页

作者： Naga Raju Maddela Zhihao Gan Yabing Meng Fuqiang Fan Fangang Meng School of Environmental Science and Engineering Sun Yat-sen UniversityGuangzhou 510006China Departamento de Ciencias Biológicas Facultad de Ciencias de la SaludUniversidad Técnica de ManabíPortoviejo 130105Ecuador Guangdong Provincial Key Laboratory of Environmental Pollution Control and Remediation Technology Guangzhou 510006China

Nitrogen removal is a critical process in water treatment plants(WIPs)and Wastewater treatment plants(WWTPs).The recent discovery of a novel bacterial process,complete ammonia oxidation(comammox,CMX),has refuted a century-long perception of the two-step conversion of NH3to NO3-.Compared with canonical nitrifiers,CMX bacteria offer undeniable advantages,such as a high growth yield propensity and adaptability to nutrient-and growth-limiting conditions,which collectively draw attention to validate the aptness of CMX bacteria to Wastewater treatment.As there has been no comprehensive review on the relevance of CMX bacteria for sustainable water and Wastewater treatment,this review is intended to discuss the roles and applications of CMX in the removal of nitrogen and pollutants from water and wastewater.We took into account insights into the metabolic versatilities of CMX bacteria at the clade and subclade levels.We focused on the distribution of CMX bacteria in engineered systems,niche differentiation,co-occurrence and interactions with cano nical nitrifiers for a better understanding of CMX bacteria in terms of their ecophysiology.Conceptualized details on the reactor adaptability and stress response of CMX bacteria are provided.The potential of CMX bacteria to degrade micropollutants either directly or co-metabolically was evaluated,and these insights would be an indispensable advantage in opening the doors for wider applications of CMX bacteria in WWTPs.Finally,we summarized future directions of research that are imperative in improving the understanding of CMX biology.

关键词： Comammox bacteria Wastewater treatment Nitrogen removal Micropollutant degradation Reactor operation

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