2013•Guangzhou Chemical IndustryRequires access
Research on COD Removal in Coking Wastewater
Yang Chang-jiang
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Abstract
The iron-carbon micro-electrolysis-hydrolytic acidification and immobilized highly efficient bacteria and coagulation technology were used to treat coking wastewater after steaming ammonia.Results showed that after iron carbon micro-electrolysis,the B/C of wastewater increased from 0.20 to 0.39,after hydrolytic acidification,the B/C of wastewater increased to 0.44.Then using baffle biochemical reactor,when HRT = 48 h,CODCr reduced from 3717 mg/L to 393 mg/L,the removal rate reached about 90%.Biochemical effluent under the best conditions of the coagulant dose was 6 mL,pH = 7,the temperature of 35 ℃,coagulant aids dose was 3 mL,CODCr finally reduced to 65 mg/L,attained the First Grade discharge standard of integrated wastewater.