Abstract
Enhance chemical coagulation for coking wastewater was employed as advanced treatment method for A/O biological effluent in this paper. Factors such as solution pH and coagulant dosage that influence the process of coagulation were experimentally tested. The index of A/O biological treatment of coking wastewater was: CODCr value was 367mg/L, Turbidity was 44 UNT and Chroma was 75. Results showed that during pH value 4~10 range and the same dosage of coagulation process, turbidity, chroma and CODCr removal rate of A/O biological effluent of coking wastewater were the best when pH = 6. The optimum dosage coagulant is 10mg/L when the pH = 6, this dosage is the best for removal rate of chroma, turbidity and CODCr. The removal rate of chroma, turbidity and CODCr is respectively 66.67%, 50% and 68%.The A/O biological effluent of coking wastewater meets the national emission standards finally.
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