Abstract
The operational characteristics of anaerobic bioreactors in treating swine wastewater were evaluated upto hydraulic retention time (HRT) of 1 day and organic loading rate (OLR) of 5.1 kg-COD/m 3 · d for 200 days. The bioreactors were effective in treating swine wastewaters with COD removal efficiency of 78.9~81.5% and biogas generation of 0.39~0.59 m 3 /kg-CODr at OLR of 1.1~2.2 kg-COD/m 3 d. The · two-stage ASBF anaerobic bioreactors was effective in treating different characteristics of swine wastewaters since they showed high and stable COD removal efficiency at high OLR due to effective retention of biomass by media and staging. The effects of ammonia on anaerobic digestion were investigated by operating two-stage ASBF reactors using swine wastewaters as influent without and with ammonia removal at HRT of 1~2 days and OLR of 2.2~9.6 kg-COD/m 3 d for 250 days. The COD removal efficiency and biogas ·
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