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STABILIZATION OF SEWAGE SLUDGE BY TWO-PHASE ANAEROBIC DIGESTION
Citation:
Ghosh, S., M. Henry, AND A. Sajjad. STABILIZATION OF SEWAGE SLUDGE BY TWO-PHASE ANAEROBIC DIGESTION. U.S. Environmental Protection Agency, Washington, D.C., EPA/600/2-87/040.
Description:
The research described in the report was concerned with evaluation of alternative approaches to anaerobic digestion, a process commonly used on the residual stream from wastewater treatment. The principal approach studied was that of separating the acid- and methane-forming phases by using two digestion vessels rather than one. The effects of varying temperature and other operating parameters, and of adding enzymes to the process, were also investigated. For continuous-flow, continuously stirred tank reactors, the two-phase process performed better than single-stage digestion for all operating conditions. Novel upflow digesters having high solids retention were also evaluated and offered further improvements. The enzyme additions also enhanced two-phase digestion.