Municipal wastewater treatment and associated bioenergy generation using anaerobic granular bed baffled reactor

Kiran Tota-Maharaj, Joseph C. Akunna, Denver Cheddie

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This study assesses a modified anaerobic granular bed baffled reactor (GRABBR) which was assessed for municipal wastewater treatment at high organic loading rates (chemical oxygen demand ≥ 1,100 mg/l) under varying temperatures. For the two mesophilic temperatures tested (37⁰C and 25⁰C) under steady state conditions, the removal of Chemical Oxygen
Demand (COD) and Biochemical Oxygen Demand (BOD) was 80 to 90 %. At lower organic loadings, the reactor operated as a completely mixed system with most of the treatment occurring in the first two compartments. The GRABBR also showed very high solids retention with low effluent suspended solids concentration for all organic and hydraulic conditions. Applications of
GRABBR as a single unit, two-phase treatment system could be an economical option reducing the cost to achieve similar treatment goals for high strength wastewaters. The findings of this research suggest that the application of GRABBR is suitable for the treatment of multiple pollutants present in wastewater where each compartment acts as a specialised treatment stage
with biogas production.
Original languageEnglish
Pages (from-to)11-19
Number of pages9
JournalJournal of the Association of Professional Engineers of Trinidad & Tobago
Issue number1
Publication statusPublished - 31 Jul 2017


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