混凝-IBAC深度处理焦化废水的试验研究

Advanced treatment of coking wastewater with coagulation-IBAC process

以哈尔滨某气化厂焦化废水为目标,探讨混凝-固定化生物活性炭(IBAC)工艺对哈尔滨气化厂焦化废水进行深度处理的净化效能及其可行性。采用筛选、驯化的脱酚菌,对活性炭(GAC)进行固定,使之形成固定化生物活性炭。当该工艺进水COD<800 mg/L时,出水COD在100 mg/L以下,平均去除率在80%左右;当进水总酚在200 mg/L以下时,出水的总酚含量基本在20 mg/L以下;当进水氨氮浓度在75 mg/L以下时,出水氨氮浓度在25 mg/L以下。焦化废水中各污染物指标经混凝-IBAC工艺深度处理后可达污水综合排放标准(GB 8978-1996)的二级标准。

The performance and feasibility of coagulation plus immobilization biological activated carbon （IBAC） were investigated to treat coking wastewater. IBAC has been developed on the granular activated carbon by immobilization of selected and acclimated species of phenol-degrading bacteria to treat the coking wastewater. Effluent COD was below 100 mg/L when influent COD was below 800 mg/L; removal efficiency of COD was about 80%. When total phenol and ammonia of influent were below 200 mg/L and 75 mg/L respectively, total phenol and ammonia of effluent were below 20 mg/L and 25 mg/L individually. Effluent indexes of coking wastewater treated by coagulation-IBAC process can meet the National Discharge Standards for Industrial Wastewater.