An Evaluation of 3 Stage Anaerobic Digestion of Municipal Wastewater Treatment Plant Sludges

Authors: Salsali, Hamid Reza; Parker, Wayne J.

Source: Water Practice, Volume 1, Number 1, April 2007 , pp. 1-12(12)

Publisher: Water Environment Federation

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Abstract:

This study evaluated the efficiency of three stage operation of anaerobic digestion of municipal sewage sludge. Various combinations of conventional (35°C) and non-conventional (42 and 49°C) temperatures were evaluated. Three stage operation was able to achieve enhanced volatile solids reduction as compared to single stage operation. Operation of the first stage at 42°C and 49°C resulted in an 8-12% increase in VS destruction. Stable operation of three stage configurations was indicated by low concentrations of total volatile fatty acids and substantial alkalinity generation. An increase in temperature to 42°C in the second stage of the investigated system showed no significant change in final effluent quality. Three stage operation resulted in a greater reduction of all indicator organisms when the first stage of the 3 stage system was operated at either 42°C or 49°C as compared to operation at 35°C.

Keywords: PATHOGENS; SLUDGE; DIGESTION; ANAEROBIC; BIOSOLIDS; VS DESTRUCTION; BIOGAS

Document Type: Research article

DOI: http://dx.doi.org/10.2175/193317707X194918

Publication date: 2007-04-01

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Water Practice™ publishes peer-reviewed articles and reports focusing on applied water studies. Topics include monitoring, facility operations and maintenance, management, policy, and other issues of interest and concern to water practitioners. The Journal publishes on a monthly to bi-monthly basis and is available online only.
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