The removal effect of an organic polymer demulsifier and coagulant on COD in the wastewater was studied.The effects of demulsifier type,dosage and pH value,coagulant type,dosage and pH value on COD removal rate of wastewater were systematically investigated.The result showed that the demulsifier is fatty amine polyoxyethylene ether demulsifier,the optimal dosage is 3 g/L,pH value is 6,COD removal rate is 34.2％,oil content removal rate is 62.3％,coagulant is organic amine coagulant,the optimal dos-age is 5 mg/L,pH value is 6,and COD removal rate is 52％.
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