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Analysis of Sydney＇s recycled water schemes

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Frontiers of Environmental Science & Engineering 2013年第4期7卷 608-615页

作者： Zhuo CHEN huu hao ngo Wenshan GUO Xiaochang WANGt Centre for Technology in Water and Wastewater School of Civil and Environmental Engineering University of Technology Sydney Sydney 2007 Australia School of Municipal and Environmental Engineering Xi'an University of Architecture and Technology Xi'an 710055 China

Recycled water provides a viable opportunity to partially supplement fresh water supplies as well as substantially alleviate environmental loads. Currently, thousands of recycled water schemes have been success- fully conducted in a number of countries and Sydney is one of the leading cities, which has made massive effort to apply water reclamation, recycling and reuse. This study aims to make a comprehensive analysis of recycled water schemes in Sydney for a wide range of end uses such as landscape irrigation, industrial process uses and residential uses （e.g., golf course irrigation, industrial cooling water reuse, toilet flushing and clothes washing etc.）. For each representative recycled water scheme, this study investi- gates the involved wastewater treatment technologies, the effluent quality compared with specified guideline values and public attitudes toward different end uses. Based on these obtained data, multi criteria analysis （MCA） in terms of risk, cost-benefit, environmental and social aspects can be performed. Consequently, from the analytical results, the good prospects of further expansion and exploration of current and new end uses were identified toward the integrated water planning and management. The analyses could also help decision makers in making a sound judgment for future recycled water projects.

关键词： recycled water schemes end use waterquality public attitudes integrated water planning andmanagement

Dynamic membrane bioreactor performance enhancement by powdered activated carbon addition:Evaluation of sludge morphological,aggregative and microbial properties

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Journal of Environmental Sciences 2019年第1期31卷 73-83页

作者： Zhenzhen Yu Yisong Hu Mawuli Dzakpasu Xiaochang C.Wang huu hao ngo Key Lab of Northwest Water Resource Environment and Ecology MOE Xi'an University of Architecture and Technology International Science & Technology Cooperation Center for Urban Alternative Water Resources Development Key Lab of Environmental Engineering Centre for Technology in Water and Wastewater School of Civil and Environmental Engineering University of Technology Sydney

The effects of powdered activated carbon(PAC) addition on sludge morphological, aggregative and microbial properties in a dynamic membrane bioreactor(DMBR) were investigated to explore the enhancement mechanism of pollutants removal and filtration performance. Sludge properties were analyzed through various analytical measurements. The results showed that the improved sludge aggregation ability and the evolution of microbial communities affected sludge morphology in PAC-DMBR, as evidenced by the formation of large, regularly shaped and strengthened sludge flocs. The modifications of sludge characteristics promoted the formation process and filtration flux of the dynamic membrane(DM) layer. Additionally, PAC addition did not exert very significant influence on the propagation of eukaryotes(protists and metazoans)and microbial metabolic activity. High-throughput pyrosequencing results indicated that adding PAC improved the bacterial diversity in activated sludge, as PAC addition brought about additional microenvironment in the form of biological PAC(BPAC), which promoted the enrichment of Acinetobacter(13.9%), Comamonas(2.9%), Flavobacterium(0.31%) and Pseudomonas(0.62%), all contributing to sludge flocs formation and several(such as Acinetobacter) capable of biodegrading relatively complex organics. Therefore, PAC addition could favorably modify sludge properties from various aspects and thus enhance the DMBR performance.

关键词： Dynamic membrane bioreactor Powdered activated carbon Sludge property Filtration performance Wastewater treatment Microbial community

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 ***,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 *** 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 *** 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 *** analyses confirmed that appropriate dosages of TCS primarily decreased the cake layer and hydraulically reversible *** 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 *** 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

A comprehensive simulation approach for pollutant bio-transformation in the gravity sewer

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Frontiers of Environmental Science & Engineering 2019年第4期13卷 179-190页

作者： Nan Zhao huu hao ngo Yuyou Li Xiaochang Wang Lei Yang Pengkang Jin Guangxi Sun School of Environmental and Municipal Engineering Xi'an University of Architecture and TechnologyXi'an 710055China Centre for Technology in Water and Wastewater School of Civil and Environmental EngineeringUniversity of TechnologySydneyNSW 2007Australia Department of Civil and Environmental Engineering Tohoku UniversitySendaiMiyagi 980-8579Japan Research Center for Eco-Environmental Sciences Chinese Academy of SciencesBeijing 100085China

Presently, several activated sludge models (ASMs) have been developed to describe a few biochemical processes. However, the commonly used ASM neither clearly describe the migratory transformation characteristics of fermentation nor depict the relationship between the carbon source and biochemical reactions. In addition, these models also do not describe both ammonification and the integrated metabolic processes in sewage transportation. In view of these limitations, we developed a new and comprehensive model that introduces anaerobic fermentation into the ASM and simulates the process of sulfate reduction, ammonification, hydrolysis, acidogenesis and methanogenesis in a gravity sewer. The model correctly predicts the transformation of organics including proteins, lipids, polysaccharides, etc. The simulation results show that the degradation of organics easily generates acetic acid in the sewer system and the high yield of acetic acid is closely linked to methanogenic metabolism. Moreover, propionic acid is the crucial substrate for sulfate reduction and ammonification tends to be affected by the concentration of amino acids. Our model provides a promising tool for simulating and predicting outcomes in response to variations in wastewater quality in sewers.

关键词： Gravity sewer Modeling Pollutant transformation Biochemical reaction process

Algae-mediated antibiotic wastewater treatment:A critical review

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Environmental Science and Ecotechnology 2022年第1期9卷 40-52页

作者： Shengnan Li Pau Loke Show huu hao ngo Shih-Hsin Ho State Key Laboratory of Urban Water Resource and Environment School of EnvironmentHarbin Institute of TechnologyHarbinHeilongjiang Province150090China Department of Chemical and Environmental Engineering Faculty of Science and EngineeringUniversity of Nottingham MalaysiaJalan BrogaSemenyih43500Selangor Darul EhsanMalaysia Centre for Technology in Water and Wastewater School of Civil and Environmental EngineeringUniversity of Technology SydneySydneyNWS2007Australia

The existence of continually increasing concentrations of antibiotics in the environment is a serious potential hazard due to their toxicity and ***,conventional treatment techniques,such as those utilized in wastewater treatment plants,are not efficient for the treatment of wastewater containing ***,algae-based technologies have been found to be a sustainable and promising technique for antibiotic ***,this review aims to provide a critical summary of algae-based technologies and their important role in antibiotic wastewater *** removal mechanisms including bioadsorption,bioaccumulation,and biodegradation are discussed in detail,with using algae-bacteria consortia for antibiotic treatment,integration of algae with other microorganisms(fungi and multiple algal species),hybrid algae-based treatment and constructed wetlands,and the factors affecting algal antibiotic degradation comprehensively described and *** addition,the use of algae as a precursor for the production of biochar is highlighted,along with the modification of biochar with other materials to improve its antibiotic removal capacity and hybrid algae-based treatment with advanced oxidation ***,recent novel approaches for enhancing antibiotic removal,such as the use of genetic engineering to enhance the antibiotic degradation capacity of algae and the integration of algal antibiotic removal with bioelectrochemical systems are ***,some based on the critical review,key future research perspectives are ***,this review systematically presents the current progress in algae-mediated antibiotic removal technologies,providing some novel insights for improved alleviation of antibiotic pollution in aquatic environments。

关键词： ABC Algae-bacteria consortia Algae-based technology Antibiotic wastewater treatment ARGs Antibiotic resistance genes Removal mechanisms Hybrid system

Investigation and assessment of micropollutants and associated biological effects in wastewater treatment processes

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Journal of Environmental Sciences 2020年第8期32卷 119-127页

作者： Xiaoyan Y.Ma Ke Dong Lei Tang Yongkun Wang Xiaochang C.Wang huu hao ngo Rong Chen Na Wang International Science&Technology Cooperation Center for Urban Alternative Water Resources Development Key Lab of Northwest Water ResourceEnvironment and EcologyMOEEngineering Technology Research Center for Wastewater Treatment and ReuseShaanxi ProvinceShaanxi Key Laboratory of Environmental EngineeringXi’an University of Architecture and TechnologyXi’an 710055China School of Civil and Environmental Engineering Faculty of Engineering and Information TechnologyUniversity of Technology SydneyBroadwayNSW 2007Australia School of Architecture and Civil Engineering Xi’an University of Science and TechnologyXi’an 710054China

Currently,the wastewater treatment plants(WWTPs)attempt to achieve the shifting from general pollution parameters control to reduction of organic micropollutants ***,they have not been able to satisfy the increasing ecological safety *** this study,the removal of micropollutants was investigated,and the ecological safety was assessed for a local *** the total concentration of 31 micropollutants detected was reduced by 83%using the traditional biological treatment processes,the results did not reflect chemicals that had poor removal efficiencies and low *** the five categories of micropollutants,herbicides,insecticides,and bactericides were difficult to remove,pharmaceuticals and UV filters were effectively *** specific photosynthesis inhibition effect and non-specific bioluminescence inhibition effect from wastewater were detected and evaluated using hazardous concentration where 5%of aquatic organisms are *** photosynthesis inhibition effect from wastewater in the WWTP was negligible,even the untreated raw ***,the bioluminescence inhibition effect from wastewater which was defined as the priority biological effect,posed potential ecological *** decrease non-specific biological effects,especially of macromolecular dissolved organic matter,overall pollutant reduction strategy is ***,the ozonation process was used to further decrease the bioluminescence inhibition effects from the secondary effluent;≥0.34 g O 3/g DOC of ozone dose was recommended for micropollutants elimination control and ecological safety.

关键词： Micropollutants Biological effect Wastewater treatment Ecological safety Ozonation

Pesticides in stormwater runoff-A mini review

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Frontiers of Environmental Science & Engineering 2019年第5期13卷 5-16页

作者： Cheng Chen Wenshan Guo huu hao ngo Centre for Technology in Water and Wastewater.School of Civil and Environmental Engineering University of Technology SydneySydney NSW 2007Australia

Recently,scientific interest has grown in harvesting and treating stormwater for potable water use,in order to combat the serious global water scarcity *** this context,pesticides have been identified as the key knowledge gap as far as reusing stormwater is *** paper reviewed the presence of pesticides in stormwater runoff in both rural and urban ***,the sources of pesticide contamination and possible pathways were investigated in this *** factors affecting pesticides in stormwater runoff were critically identified as:1)characteristics of precipitation,2)properties of pesticide,3)patterns of pesticides use,and 4)properties of application *** available pesticide mitigation strategies including best management practice(BMP),low impact development(LID),green infrastructure(GI)and sponge city(SC)were also included in this *** the future,large-scale multi-catchment studies that directly evaluate pesticide concentrations in both urban and rural stormwater runoff will be of great importance for the development of effective pesticides treatment approaches and stormwater harvesting strategies.

关键词： Pesticide Stormwater runoff Occurrence Urban runoff

生物炭回收水中氮磷营养物质的研究进展与挑战

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化工进展 2023年第10期42卷 5459-5469页

作者：王书燕张新波彭安萍刘阳 huu hao ngo 郭文珊温海涛天津城建大学环境与市政工程学院基础设施防护和环境绿色生物技术国际联合研究中心天津300384 天津城建大学天津市水质科学与技术重点实验室天津300384

水中过量氮磷营养物质的存在会引发水体富营养化。生物炭具有比表面积大、孔隙率高、热稳定性强、表面官能团丰富等优点,在吸附去除水中污染物方面呈现出良好性能。近年来,生物炭作为一种经济高效的吸附剂回收水中的氮和磷而受到了广泛... 详细信息

水中过量氮磷营养物质的存在会引发水体富营养化。生物炭具有比表面积大、孔隙率高、热稳定性强、表面官能团丰富等优点,在吸附去除水中污染物方面呈现出良好性能。近年来,生物炭作为一种经济高效的吸附剂回收水中的氮和磷而受到了广泛关注,但不同种类生物炭对水中氮或磷的吸附性能有较大的差异。本文综述了基于各种废弃生物质制备及改性的生物炭对水中氮和磷的吸附性能,探讨分析了影响生物炭吸附水中氮和磷性能的主要因素,包括制备条件、环境温度、溶液pH和共存离子等,阐述了生物炭吸附水中氮和磷的主要机理。同时指出了目前生物炭在实际应用中所面临的挑战,并进一步展望了未来生物炭的重点研究方向,从而为实际利用生物炭吸附回收水中的氮和磷提供理论依据。

关键词：生物炭氮磷吸附性能去除机理

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正渗透技术应用于污废水处理的研究进展

膜科学与技术 2022年第1期42卷 192-200页

作者：龙中亮 huu hao ngo 张新波刘颖王慧中温海涛天津城建大学基础设施防护和环境绿色生物技术国际联合研究中心天津300384 天津城建大学天津市水质科学与技术重点实验室天津300384

随着我国污废水处理市场和规模的进一步扩大,同时膜材料生产成本下降,促进了膜技术在废水处理领域的迅速发展.不同于传统施加外压的压力驱动膜处理技术,正渗透以其低能耗、低污染和高截留能力的特点引起了广泛关注.本文从正渗透技术原... 详细信息

随着我国污废水处理市场和规模的进一步扩大,同时膜材料生产成本下降,促进了膜技术在废水处理领域的迅速发展.不同于传统施加外压的压力驱动膜处理技术,正渗透以其低能耗、低污染和高截留能力的特点引起了广泛关注.本文从正渗透技术原理出发,介绍了膜材料、汲取液种类和浓差极化3个主要影响因素;其次,分析了正渗透技术及组合工艺在废水处理领域的研究与应用现状;最后,基于正渗透技术在废水处理及资源化应用中仍存在的4个问题,对其未来发展方向和前景进行了展望.

关键词：正渗透影响因素浓差极化废水处理