Improving the efficiency of small-scale wastewater treatment by pneumatic agitation

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dc.contributor.authorSun, Shaohua
dc.contributor.authorTong, Yanming
dc.contributor.authorHou, Aiying
dc.contributor.authorYin, Lijun
dc.contributor.authorZheng, Tong
dc.contributor.authorZheng, Jie
dc.contributor.authorLiu, Jicheng
dc.contributor.authorCao, Bing
dc.contributor.authorHu, Qing
dc.contributor.authorCoulon, Frederic
dc.contributor.authorYang, Xiao Jin
dc.date.accessioned2022-01-13T10:40:45Z
dc.date.available2022-01-13T10:40:45Z
dc.date.issued2021-12-23
dc.description.abstractSmall-scale anaerobic and aerobic systems for wastewater treatment suffer relatively low efficiencies due primarily to a lack of mechanical agitation/mixing. Here, a pneumatic agitation system was designed by installing a U-tube between the anaerobic and anoxic units, pumping air to the closed headspace of the anaerobic unit and releasing the pressurized air through the U-tube to create turbulence of the fluid. Computational Fluid Dynamics (CFD) simulation and fluid tracer trial were used to describe the fluid status in a lab-scale system (13 L). The results demonstrated that a continuous 5-cycle pneumatic agitation achieved a complete mixing of the static fluid. The retention time factor () and short-circuiting flow coefficient (/HRT) were increased from 0.93 to 1.14 and 0.02 to 0.27, respectively, indicating that pneumatic agitation significantly reduced dead zone and short-circuiting flow. A prototype at a treatment capacity of 300 L/d was installed in the North-East suburb of Beijing (40.15° N, 116.95° E) to treat rural household wastewater consisting of 630–1200 mg/L chemical oxygen demand and 20–45 mg/L total nitrogen. The field test was monitored in a period of 75 days from September to November 2018. The average removal rate for COD and TN was 96% and 92%, respectively by 10 times/h pneumatic agitation as compared to 49% and 45% without pneumatic agitation. The pneumatic agitation provides a low cost, easy operation and maintenance and efficient means for small-scale domestic wastewater treatment.en_UK
dc.identifier.citationSun S, Tong Y, Hou A, et al., (2022) Improving the efficiency of small-scale wastewater treatment by pneumatic agitation, Environmental Technology and Innovation, Volume 26, May 2022, Article number 102220en_UK
dc.identifier.issn2352-1864
dc.identifier.urihttps://doi.org/10.1016/j.eti.2021.102220
dc.identifier.urihttp://dspace.lib.cranfield.ac.uk/handle/1826/17407
dc.language.isoenen_UK
dc.publisherElsevieren_UK
dc.rightsAttribution-NonCommercial-NoDerivatives 4.0 International*
dc.rights.urihttp://creativecommons.org/licenses/by-nc-nd/4.0/*
dc.subjectDomestic wastewater treatmenten_UK
dc.subjectSmall-scaleen_UK
dc.subjectPneumatic agitationen_UK
dc.subjectChemical oxygen demanden_UK
dc.subjectTotal nitrogenen_UK
dc.titleImproving the efficiency of small-scale wastewater treatment by pneumatic agitationen_UK
dc.typeArticleen_UK

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