Swine Wastewater Treatment by A Process Consisted of UASB Reactor and Aerobic Biological Filter.

Abstract

An experiment was carried out concernings wine wastewater treatment by aprocess consisted of the UASB reactor (20 cm in diameter, 300 cm in height) and an aerobic biological filter (9.6 cm in diameter, 200 cm in height) as a post treatment. Filter medium modules consisted of polyester non-woven cloth and polyvinyl chloride spacer sheet were packed in the biological filter.Swine waste discharged froma flat floor type swine barn was used as influent which average water quality was 535 mg/l for BOD and 72 mg/l for NH4-N. Hydraulic retention time of UASB reactor was about 1 day.The average loading rate of BOD was 0.5 kg/m3⋅day for the UASB reactor and 1.4 kg/m3⋅day for the biological filter. The experiment was carried out from July to December at ambient water temperature. Forty to seventy percent of BOD removal rate was maintained for the UASB reactor at water temperature of 5-30°C.The removal rate of BOD by the biological filter was 30-80%. An average settled effluent BOD was 52 mg/l during 5 July and 5 November and increased to about 148 mg/l during 10 November and 22 December. Reduction rates of NH4-N by the biological filter were about 30-50% at the water temperature of 25-30°C, and lO-25% at the water temperature of 5-10°C.