Characteristics of treated swine wastewater
are presented in Table l. Although the wastewater had been pre-treated in the waste
stabilization pond, it still contained high organic pollutants, which were expressed in terms of high BOD, COD and TKN values. The ratio of COD:BOD (3:l) was in the normal range of general agricultural waste in which most organic pollutants are simply biodegradable. Most of these organic pollutants come from feces and
urineo f swinea ndr esultedin hieh TKN. TP and SS values. The characteristics of BOD. COD. TKN and SS exceeded the Thai Industrial Effluent
Standard of 20, 120, 100 and 50 mg/L respectively (Ministry of Industry, 1996). lt
confirms that swine wastewater needs additional treating process before being discharged into the natural water resource.