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Metabolic uncoupler,3,3’,4’,5-tetrachlorosalicylanilide addition for sludge reduction and fouling control in a gravity-driven membrane bioreactor

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Frontiers of Environmental Science & Engineering 2020年第6期14卷 53-64页

作者： An Ding Yingxue Zhao Huu Hao Ngo Langming Bai Guibai Li Heng Liang Nanqi Ren Jun Nan State Key Laboratory of Urban Water Resource and Environment(SKLUWRE) School of EnvironmentHarbin Institute of Technology73 Huanghe RoadNangang DistrictHarbin 150090China Faculty of Engineering University of Technology SydneySydneyNSW 2007Australia

The gravity-driven membrane bioreactor(MBR)system is promising for decentralized sewage treatment because of its low energy consumption and maintenance requirements.However,the growing sludge not only increases membrane fouling,but also augments operational complexities(sludge discharge).We added the metabolic uncoupler 3,3’,4f,5-tetrachlorosalicylanilide(TC$)to the system to deal with the mentioned issues.Based on the results,TCS addition effectively decreased sludge ATP and sludge yield(reduced by 50%).Extracellular polymeric substances(EPS;proteins and polysaccharides)decreased with the addition of TCS and were transformed into dissolved soluble microbial products(SMPs)in the bulk solution,leading to the break of sludge floes into small fragments.Permeability was increased by more than two times,reaching 60-70 L/m2/h bar when 10-30 mg/L TCS were added,because of the reduced suspended sludge and the formation of a thin cake layer with low EPS levels.Resistance analyses confirmed that appropriate dosages of TCS primarily decreased the cake layer and hydraulically reversible resistances.Permeability decreased at high dosage(50 mg/L)due to the release of excess sludge fragments and SMP into the supernatant,with a thin but more compact fouling layer with low bioactivity developing on the membrane surface,causing higher cake layer and pore blocking resistances.Our study provides a fundamental understanding of how a metabolic uncoupler affects the sludge and bio-fouling layers at different dosages,with practical relevance for in situ sludge reduction and membrane fouling alleviation in MBR systems.

关键词： Gravity-driven membrane(GDM) Energy uncoupling Permeability sludge reduction Membrane fouling Fouling layer

Co-application of energy uncoupling and ultrafiltration in sludge treatment:Evaluations of sludge reduction,supernatant recovery and membrane fouling control

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Frontiers of Environmental Science & Engineering 2020年第4期14卷 43-52页

作者： An Ding Yingxue Zhao Zhongsen Yan Langming Bai Haiyang Yang Heng Liang Guibai Li Nanqi Ren State Key Laboratory of Urban Water Resource and Environment(SKLUWRE) Harbin Institute of TechnologyHarbin 150090China College of Civil Engineering Fuzhou UniversityFuzhou 350116China

Energy uncoupling is often used for sludge reduction because it is easy to operate and does not require a significant amount of extra equipments(i.***.no additional tank required).However,over time the supernatant extracted using this method can deteriorate,ultimately requiring further treatment.The purpose of this study was to determine the effect of using a low-pressure ultrafiltration membrane process for sludge water recovery after the sludge had undergone an energy uncoupling treatment(using 3,3’,4’,5-tetrachlorosalicylanilide(TCS)).Energy uncoupling was found to break apart sludge floe by reducing extracellular polymeric substances(EPS)and adenosine triphosphate(ATP)content.Analysis of supernatant indicated that when energy uncoupling and membrane filtration were coapplied and the TCS dosage was below 30 mg/L,there was no significant deterioration in organic component removal.However,ammonia and phosphate concentrations were found to increase as the concentration of TCS added increased.Additionally,due to low sludge concentrations and EPS contents,addition of 30-60 mg/L TCS during sludge reduction increased the permeate flux(two times higher than the control)and decreased the hydraulic reversible and cake layer resistances.In contrast,high dosage of TCS aggravated membrane fouling by forming compact fouling layers.In general,this study found that the co-application of energy uncoupling and membrane filtration processes represents an effective alternative method for simultaneous sludge reduction and sludge supernatant recovery.

关键词： sludge reduction Energy uncoupling Ultrafiltration membrane Membrane fouling

sludge reduction Induced by Aquatic Worms in SBR Wastewater Treatment System

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Sludge Reduction Induced by Aquatic Worms in SBR Wastewater ...

sludge Drying and Incineration Method Applied to sludge reduction Research

2011 International Symposium on Water Resource and Environmental Protection(ISWREP 2011)

作者： Mingshan Zhu Maoxin Guo Shaoting Du Yingqi Song College of Environmental Science and Engineering Zhejiang Gongshang University

sludge reduction effects of the Sequencing Batch Reactor （SBR） with aquatic worms were studied.When the density of aquatic worms was 4800 mg/L,the average sludge yield of the SBR with aquatic worms was 0.17 g SS /g COD,reducing by 21.20% in comparison with that of SBR without aquatic worms.Furthermore,the values of SVI of worms-group were slightly lower than that of control.Therefore,inoculation of the aquatic worms in SBR can effectively reduce sludge and might have a contribution to improve sludge settling characteristics.

关键词： aquatic worms sludge reduction SBR wastewater treatment

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Agricultural Biotechnology 2021年第6期10卷 98-103页

作者： Jingang XIANG Feng'e ZHANG School of Environmental and Safety Engineering Changzhou UniversityChangzhou 213164China

This work takes sludge drying and incineration and pollutant discharge characteristics as the main line of research.With sludge dewatered by a certain sewage plant in southern Jiangsu using machinery and chemical conditioners selected as the research object,the influencing factors such as particle size,drying temperature and sludge reverse-mixing ratio in the sludge drying process were mainly explored,and the best working conditions of sludge drying were further analyzed.On this basis,in-depth research was carried out on the pollutants such as NO_(x),SO_(2),HCl,CO and other pollutants generated in the sludge incineration process by investigating the incineration temperature,sewage,the sludge moisture content and excess air coefficient.The results showed that the best conditions for sludge drying were as follows:particle size 3.5 mm,temperature 210℃and reverse-mixing ratio 25,and the cumulative drying time of the sludge 445.21 min.Through the research on the pollutant emission characteristics of sludge incineration,it was found that the incineration temperature and the moisture content of the sludge had a greater impact on the emission concentrations of NO_(x),SO_(2),HCl,and CO.Among them,the incineration temperature was the key factor that affected the generation of NO_(x),SO_(2),HCl,and CO.

关键词： sludge sludge reduction Dry incineration

Carbon source recovery from waste sludge reduces greenhouse gas emissions in a pilot-scale industrial wastewater treatment plant

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Environmental Science and Ecotechnology 2023年第2期14卷 106-113页

作者： Qiandi Wang Xiqi Li Wenzong Liu Siyuan Zhai Qiongying Xu Chang'an Huan Shichen Nie Qinghua Ouyang Hongcheng Wang Aijie Wang CAS Key Laboratory of Environmental Biotechnology Research Center for Eco-Environmental SciencesChinese Academy of SciencesBeijing100085PR China University of Chinese Academy of Sciences Beijing100049PR China State Key Laboratory of Urban Water Resource and Environment Harbin Institute of Technology(Shenzhen)Shenzhen518055PR China State Key Laboratory of Urban Water Resource and Environment School of EnvironmentHarbin Institute of TechnologyHarbin150090PR China Shandong Shenshui Hynar Water Environmental Protection Co. Ltd.Shandong274000PR China Shenshui Hynar Water Group Co. Ltd.Shenzhen518055PR China

Carbon cycle regulation and greenhouse gas(GHG)emission abatement within wastewater treatment plants(WWTPs)can theoretically improve sustainability.Currently,however,large amounts of external carbon sources used for deep nitrogen removal and waste sludge disposal aggravate the carbon footprint of most WWTPs.In this pilot-scale study,considerable carbon was preliminarily recovered from primary sludge(PS)through short-term(five days)acidogenic fermentation and subsequently utilized on-site for denitrification in a wool processing industrialWWTP.The recovered sludge-derived carbon sources were excellent electron donors that could be used as additional carbon supplements for commercial glucose to enhance denitrification.Additionally,improvements in carbon and nitrogen flow further contributed to GHG emission abatement.Overall,a 9.1%reduction in sludge volatile solids was achieved from carbon recovery,which offset 57.4%of external carbon sources,and the indirect GHG emissions of the target industrial WWTP were reduced by 8.05%.This study demonstrates that optimizing the allocation of carbon mass flow within a WWTP has numerous benefits.

关键词： Carbon neutralization Resource recovery Anaerobic fermentation sludge reduction Pilot-scale study

Advanced Electrolytic Tinning Line with Insoluble Anode System

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Advanced Electrolytic Tinning Line with Insoluble Anode Syst...