Study on Advanced Treatment Process Optimization of Coking Wastewater
In order to effectively solve the problem of difficult degradation of total nitrogen and CODCr in coking wastewater,the optimization of the deep treatment process for coking wastewater generated by coking enterprises in industrial parks was experimentally studied.The effluent concentration of CODCr and total nitrogen of industrial park enterprises were 148.4～374.8 mg/L and 28.71～147.31 mg/L,respectively.Through the process selection,AO+DN/DC process and Ozone+Catalytic Oxidation process were adopted to treat the coking wastewater.Ex-perimental results showed that the removal rates of CODCr and total nitrogen in wastewater were 89%and 95%in AO+DN/DC process,and the removal rates of CODCr in Ozone+Catalytic Oxidation process were 44.2%.The effluent CODCr≤40 mg/L and TN≤15 mg/L was better than the requirements of Emission Standard of Pollutant Discharge Standard for Urban Sewage Treatment Plants(GB18918-2002),Grade A standard,and could meet the requirements of enterprise reuse.The advanced treatment process of AO+DN/DC and Ozone+catalytic oxidation effectively improved the removal effect of total nitrogen and CODCr in coking wastewater,which had certain guid-ing significance for wastewater treatment in the same industry.
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