Abstract
Abstract Microaerophilic Upflow Sludge Bed Reactor (MUSB) is a new wastewater treatment process originally developed as Multi‐Stage Reversing Flow Bioreactor (MRB) in Japan. The process relies on the interaction between sulphate reducing bacteria (SRB) and microaerophilic sulphide oxidizing bacteria (SOB), Beggiatoa which dominates in organic matter removal because of a limited oxygen supply in a sludge blanket type bioreactor. A five stage laboratory MUSB reactor with a volume of 173 litres was operated for 120 days using settled domestic wastewater from the campus of Asian Institute of Technology, Bangkok, Thailand. The objective of this study was to define the system under various hydraulic retention time and organic loading conditions. The stabilization of organic matter was found to be essentially via assimilation into biomass and to some extent through aerobic metabolism by the use of dissolved oxygen added in the aerobic vessels. At an HRT of 4.5 hours and organic loading of 2 Kg COD m‐3 d‐1, maxim...
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