Anaerobic digester design using linear motion mixer

Description:Anerobic digester design using linear motion mixer. Presenter: Leslie Nemeth, M.A.Sc., P.Eng., FEC, AECOM Canada. Additional Contributors: Mike Brophy, Nanaimo WWTP Plant Superintendent; Ben Loewen, Chilliwack WWTP Plant Superintendent. New anaerobic digesters were constructed at the Chilliwack and Nanaimo WWTPs. Unique features for the digester design are roof mounted linear motion mixers (LMMs), submerged roof design and hopper bottom floor layout. The design for the digesters maximizes use of the tank volume; reduces process energy needs and enhances biogas production. The LMM equipment along with sludge recirculation provides good mixing characteristics for sludge digestion at minimal energy usage and the LMMs combined with the submerged roof design improves overall efficiency in the production of biogas and reduction of volatile solids. The design also includes biogas collection pipework attached to a constant pressure/variable volume membrane gasholder to allow efficient and controlled usage of biogas and minimize flaring to atmosphere. The digesters presently operate as mesophilic digester at 37C and the design features include operating the digesters as thermophilic digesters at 55C as required in the future. The presentation will focus on the design aspects using LMMs and the submerged roof concept plus operational review after 2 years of service.

Authors: Leslie Nemeth

Subjects: Wastewater

Tags:AC15,AC15 presentations,2015 BCWWA Annual Conference & Trade Show

Citation:Stream 9: Other

Publication Date:May 29th, 2015 Upload Date:Jun 26th, 2015

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