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Open Access Full Scale and Laboratory Scale Results from the Trial of MicroSludge at the Joint Water Pollution Control Plant at Los Angeles County

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Abstract:

MicroSludge® is a patented chemical and pressure pre-treatment process that uses chemical pre-treatment to weaken cell membranes and then a high-pressure homogenizer, or "cell disrupter", to provide an enormous and sudden pressure change to burst the cells in WAS. By increasing the liquefied proportion of WAS by orders of magnitude, a greater proportion of WAS may be converted to biogas and at a faster rate. A full-scale MicroSludge unit was commissioned at the Los Angeles County Sanitation Districts' (LACSD's) Joint Water Pollution Control Plant (JWPCP) in October 2005 for 12 months of testing. The system was operated for 24 hours each day to process approximately 192 m3/day (50,000 GPD) of thickened WAS at an average concentration of 5.4% total solids (TS). The processed WAS was co-digested with primary sludge (PS) in a 75:25 by volume (approximately 68:32 by mass) PS:WAS mix at a nominal HRT of 19 days.

Keywords: ANAEROBIC DIGESTION; CELL LYSIS; DIGESTER FOAMING; FILAMENTOUS MICROBES; HIGH PRESSURE HOMOGENIZATION; MICROSLUDGE; ODOUR REDUCTION; SLUDGE PRE-TREATMENT

Document Type: Research Article

DOI: https://doi.org/10.2175/193317707X243391

Publication date: 2007-09-01

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