Application of physical/chemical processes for treating swine liquid manure.

摘要

The major environmental concern of the swine wastewater disposal is the high concentration of total suspended solids, total phosphorus, organic carbon and nitrogen. In this project, physical/chemical treatment was applied on swine wastewater that supplied from the Swine Research & Technology Center located at the University of Alberta Edmonton Research Station. The swine manure characteristics were determined by analyzing the swine wastewater samples for the following parameters: total suspended solids (TSS), total phosphors (TP), total Kjeldahl nitrogen (TKN), ammonia nitrogen (NH3-N), five-day biochemical oxygen demand (BOD5), chemical oxygen demand (COD), etc. Laboratory experiments were carried out to determine the best operating conditions. It was found that alum was the most effective coagulant in reducing both TSS and TP. TP removal was primarily dependent on alum dose. The results from the pilot plant were consistent with those obtained from the laboratory studies. The effects of combining polymer and alum on TSS and TP removal were investigated using jar tests. Recirculating all of the pretreated supernatant improved the removal efficiency of TSS and TP during laboratory jar tests. Therefore, recirculating all of the pretreated supernatant was recommended for farm scale treatment practice. Disinfection experiments and particle size distribution analysis were conducted on the treated swine wastewater both in the laboratory and the pilot plant.