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The primary pollutants of the wastewater coming from a food processing plant located in Taiwan have been found to be animal oil and vegetable oil. The ranges, of COD and oil concentrations of the wastewater were 4,000-70,000 mg/L and 1,000-3,000 mg/L, respectively. A pilot-scale multi-functional two-phase separator (MFS) designed by UCL was employed as API separator, parallel-plate interceptor (PPI) separator, and dissolved air flotation (DAF) tank separately for oil removal process selection. The objectives of this study are to evaluate their performances for oil removal and to elucidate the optimal operation strategy. Additionally, a biological reactor was applied to treat the effluent from DAF for post treatment. Biological treatability studies were conducted in a pilot-scale activated sludge reactor and a good quality of the effluent was attained. Conclusively, the optimal treatment system for the food processing plant consisted of PPI, flocculation, DAF, and activated sludge processes.

 Author：Shan-Shan Chou-Union Chemical Laboratories, ITRI, Hsinchu, Taiwan, R.O.C.

                 Huey-Song You -Union Chemical Laboratories, ITRI, Hsinchu, Taiwan, R.O.C.

★Article source：International Specialised Conference on Pre-treatment of Industrial Wastewaters