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Biogas Quality Improvement and Struvite Formation Control Using Ferric Chloride on Anaerobic Digesters and Dewatering

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Wastewater treatment plants operating an anaerobic digester typically encounter operational problems. Winnipeg's North End Water Pollution Control Centre (NEWPCC) is no exception, experiencing frequent and excessive struvite formation on the centrate transfer pipes mainly because of high concentration of phosphorus and severe corrosion in its biogas-fuelled boilers because of high concentration of hydrogen sulphide (H2S) gas in biogas. In May 2007, a ferric chloride dosing system was installed to meet the interim effluent phosphorus license requirement stipulated by a regulator. The NEWPCC is meeting the effluent phosphorus license requirement, and FeCl3 addition to the digesters and centrifuges has eliminated the high cost of maintenance and repair associated with struvite formation in the pipes and the effects of H2S in the digester gas on the boilers.
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Keywords: Biogas; Hydrogen sulphide; anaerobic digester; centrate; ferric chloride; struvite

Document Type: Research Article

Publication date: 2009-01-01

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