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Use of Short SRT Biological Processes to Recover Energy and Phosphorus from Municipal Wastewater

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Title: Use of Short SRT Biological Processes to Recover Energy and Phosphorus from Municipal Wastewater
Author: Wang, Lihui
Department: School of Engineering
Program: Engineering
Advisor: Zhou, Hongde
Abstract: There is a paradigm shift in wastewater industry by considering it as a valuable source of energy, nutrients and other constituents instead of waste to be treated. The objective of this study is to develop a biological process operated at extremely short sludge retention time (SRT) to recover the energy and phosphorus. Extensive tests were conducted using three sets of pilot plants, each of which consists of a sequence of anoxic, anaerobic and aerobic zones in order to maximize the conversion of organic matter into the biomass and enhance biological phosphorus removal. Emphasis was placed on the effects of SRT and HRT which varied from 1.5d to 4.5d and 1h to 3h respectively. The process performance was compared in terms of organics and phosphorus removal, sludge production and characteristics. Results showed the systems were capable of achieving excellent effluent quality in spite of extremely short SRTs. Higher observed yield and reduced oxygen consumption at shorter SRT indicated a high potential of energy recovery. The kinetic parameters obtained from batch tests were used to calibrate the model configuration. The predicted system performance was further evaluated by comparing to the pilot plant data.
Date: 2013-12
Rights: Attribution-NoDerivs 2.5 Canada
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Attribution-NoDerivs 2.5 Canada Except where otherwise noted, this item's license is described as Attribution-NoDerivs 2.5 Canada