Successful Refurbishment and Commissioning of the Lions Gate WWTP Digester 4

Description:The Lions Gate Wastewater Treatment Plant currently operates thermophilic anaerobic digesters that treat approximately 167 m3/day of thickened primary sludge. Biogas produced by the digesters is utilized at the WWTP in gas driven influent pump engines and in hot water boilers. Digester No. 4 was originally built in 1975, and was recently refurbished. Key components of the refurbishment included a new digester jet mixing system, new sludge standpipe and grinder for scum control, new digested sludge transfer pumps, and refurbishment of the sludge circulation and digester gas systems. Important design considerations included scum control and maintaining a homogeneous sludge composition within the digester. Commissioning of the newly refurbished digester took place during the summer of 2011 using digested sludge from the operating digester (Digester No. 3) and sludge storage tanks as seed sludge. Key considerations during commissioning included maintaining process stability and safety. Successful start-up was achieved by carefully monitoring parameters such as sludge temperature, pH, volatile acids and alkalinity, and gradually increasing the sludge feed rate to prevent a digester upset. The availability of seed sludge and close monitoring of the digester process allowed Digester No. 4 to be commissioned in a relatively short period of time. This paper will detail the project successes and important design and commissioning considerations for upgrading an existing anaerobic digester.

Authors: O'Reilly, Caroline; Masse, Ken; Marmolejo, Leif; Brumption, Christian; Walker, Brandon

Subjects: Wastewater, Residuals and Biosolids

Tags:digestion,anaerobic,WWTP,ac2012

Citation:2012 BCWWA Annual Conference, Session 8, Penticton

Publication Date:Aug 7th, 2012 Upload Date:Aug 7th, 2012

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