This article points to the results from a study of the processes involved in treating wastewater in an Anaerobic Baffled Reactor and collecting methane as a byproduct. An ABR is essentially a combination between a septic tank and a biogas reactor, whose design aims to increase the contact time with the active biomass (sludge), which in term results in improved treatment. ABRs are often used for the primary treatement of wastewater in DEWATS (DEcentralized WAstewater Treatment Systems), while a constructed wetland is used for the secondary treatement.
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