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Extended activated sludge model no. 1 (ASM1) for simulating biodegradation process using bacterial technology 被引量:1
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作者 Ya-jing SONG Yue-bo XIE Doddi YUDIANTO 《Water Science and Engineering》 EI CAS 2012年第3期278-290,共13页
Phosphorus is one of the most important nutrients required to support various kinds of biodegradation processes. As this particular nutrient is not included in the activated sludge model no. 1 (ASM1), this study ext... Phosphorus is one of the most important nutrients required to support various kinds of biodegradation processes. As this particular nutrient is not included in the activated sludge model no. 1 (ASM1), this study extended this model in order to determine the fate of phosphorus during the biodegradation processes. When some of the kinetics parameters are modified using observed data from the restoration project of the Xuxi River in Wuxi City, China, from August 25 to 31 in 2009, the extended model shows excellent results. In order to obtain optimum values of coefficients of nitrogen and phosphorus, the mass fraction method was used to ensure that the final results were reasonable and practically relevant. The temporal distribution of the data calculated with the extended ASM1 approximates that of the observed data. 展开更多
关键词 stream restoration bacterial technology extended activated sludge model no. 1(ASM1) mass fraction Xuxi River
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Bacterial communities in different locations, seasons and segments of a dairy wastewater treatment system consisting of six segments 被引量:1
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作者 Kikue Hirota Yuji Yokota +4 位作者 Toru Sekimura Hiroshi Uchiumi Yong Guo Hiroyuki Ohta Isao Yumoto 《Journal of Environmental Sciences》 SCIE EI CAS CSCD 2016年第8期109-115,共7页
A dairy wastewater treatment system composed of the 1st segment(no aeration) equipped with a facility for the destruction of milk fat particles, four successive aerobic treatment segments with activated sludge and a... A dairy wastewater treatment system composed of the 1st segment(no aeration) equipped with a facility for the destruction of milk fat particles, four successive aerobic treatment segments with activated sludge and a final sludge settlement segment was developed. The activated sludge is circulated through the six segments by settling sediments(activated sludge) in the 6th segment and sending the sediments beck to the 1st and 2nd segments.Microbiota was examined using samples from the non-aerated 1st and aerated 2nd segments obtained from two farms using the same system in summer or winter. Principal component analysis showed that the change in microbiota from the 1st to 2nd segments concomitant with effective wastewater treatment is affected by the concentrations of activated sludge and organic matter(biological oxygen demand [BOD]), and dissolved oxygen(DO) content. Microbiota from five segments(1st and four successive aerobic segments) in one location was also examined. Although the activated sludge is circulating throughout all the segments, microbiota fluctuation was observed. The observed successive changes in microbiota reflected the changes in the concentrations of organic matter and other physicochemical conditions(such as DO), suggesting that the microbiota is flexibly changeable depending on the environmental condition in the segments. The genera Dechloromonas, Zoogloea and Leptothrix are frequently observed in this wastewater treatment system throughout the analyses of microbiota in this study. 展开更多
关键词 Dairy wastewater Dairy fat Activated sludge bacterial community analysis
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Potential acute effects of suspended aluminum nitride (AlN) nanoparticles on soluble microbial products (SMP) of activated sludge
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作者 Lijie Zhou Weiqin Zhuang +3 位作者 Xin Wang Ke Yu Shufang Yang Siqing Xia 《Journal of Environmental Sciences》 SCIE EI CAS CSCD 2017年第7期284-292,共9页
The study aims to identify the potential acute effects of suspended aluminum nitride(Al N)nanoparticles(NPs) on soluble microbial products(SMP) of activated sludge.Cultured activated sludge loaded with 1,10,50,1... The study aims to identify the potential acute effects of suspended aluminum nitride(Al N)nanoparticles(NPs) on soluble microbial products(SMP) of activated sludge.Cultured activated sludge loaded with 1,10,50,100,150 and 200 mg/L of Al N NPs were carried out in this study.As results showed,Al N NPs had a highly inverse proportionality to bacterial dehydrogenase and OUR,indicating its direct toxicity to the activated sludge viability.The toxicity of Al N NPs was mainly due to the nano-scale of Al N NPs.In SMP,Al N NPs led to the decrease of polysaccharide and humic compounds,but had slight effects on protein.The decrease of tryptophan-like substances in SMP indicated the inhibition of Al N NPs on the bacterial metabolism.Additionally,Al N NPs reduced obviously the molecular weight of SMP,which might be due to the nano-scale of Al N. 展开更多
关键词 Aluminum nitride nanoparticles Topic Soluble microbial products(SMP) Activated sludge bacterial viability
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