Laboratory Studies on the Temperature-Phased Anaerobic Digestion of Domestic Primary Sludge

The temperature-phased anaerobic process involves a two-stage reactor system with the first stage operated at a thermophilic temperature (typically 55°C) and the second stage operated at a mesophilic temperature (typically 35°C). The purpose of this laboratory study was to compare the performance of...

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Bibliographic Details
Published in:Water environment research 1997-09, Vol.69 (6), p.1139-1143
Main Authors: Han, Yue, Dague, Richard R.
Format: Article
Language:English
Subjects:
ANAEROBIC DIGESTION
Applied sciences
Biogas
Biological and medical sciences
Biological treatment of sewage sludges and wastes
Biotechnology
COLIFORM REDUCTION
Environment and pollution
Exact sciences and technology
Fecal coliforms
Fundamental and applied biological sciences. Psychology
Industrial applications and implications. Economical aspects
Methane
METHANE PRODUCTION
Other industrial wastes. Sewage sludge
PART 503 REGULATIONS
Pathogens
Pollution
Research Papers
Sludge digestion
Start up firms
TEMPERATURE‐PHASED ANAEROBIC PROCESS
VOLATILE SOLIDS DESTRUCTION
Wastes
Wastewater
Water pollution
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Summary:The temperature-phased anaerobic process involves a two-stage reactor system with the first stage operated at a thermophilic temperature (typically 55°C) and the second stage operated at a mesophilic temperature (typically 35°C). The purpose of this laboratory study was to compare the performance of the temperature-phased system with the conventional single-stage mesophilic system for treating domestic wastewater sludge. Of particular interest in the research was a comparison of the two systems from the standpoint of coliform reduction, volatile solids destruction, and biogas production. The temperature-phased system achieved almost complete destruction of total and fecal coliforms over a range of solids retention times (SRTs) from 10 to 15 days. The concentration of fecal coliforms in the effluent from the temperature-phased system never exceeded 1 000 MPN/g total solids, which can meet the U.S. federal fecal coliform requirements for Class A biosolids. At SRTs ranging from 10 to 15 days, the temperature-phased system achieved an 18% higher destruction of volatile solids and 16% more methane production than was possible with the single-stage mesophilic process.
ISSN:1061-4303
1554-7531
DOI:10.2175/106143097x125885