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Anaerobic Migrating Blanket Reactor Treatment of Low-Strength Wastewater at

Summary: Anaerobic Migrating Blanket Reactor
Treatment of Low-Strength Wastewater at
Low Temperatures
Largus T. Angenent, Gouranga C. Banik, Shihwu Sung
ABSTRACT: The feasibility of the compartmentalized anaerobic
migrating blanket reactor (AMBR) was studied for the treatment of low-
strength soluble wastewater under low-temperature conditions. During
an operating period of 186 days, a 20-L AMBR was fed nonfat dry milk
substrate as a synthetic wastewater at low temperatures (15 and 20 C).
The concentration of the influent was constant at chemical oxygen
demand (COD) and 5-day biological oxygen demand (BOD5)
concentrations of 600 and 285 mg/L, respectively. The soluble COD
(SCOD) removal efficiency was 73% at the end of the operating period
(15 C) at a 4-hour hydraulic retention time (HRT), while the total COD
(TCOD) removal efficiency was 59%. At a 4-hour HRT, staged
conditions promoted complete removal of propionic acid in the final
compartments of the reactor. The specific methanogenic activity of
granules increased slowly until the end of the operating time, improving
the removal rate. Biomass was retained effectively, as evidenced by the
solids retention time (SRT) that was always greater than 50 days even


Source: Angenent, Lars T. - Department of Biological and Environmental Engineering, Cornell University


Collections: Renewable Energy; Engineering