铁炭内电解/两级生物滤池深度处理焦化废水

Advanced Treatment of Coking Wastewater by Iron-carbon Internal Electrolysis/Two-stage Biofilters

针对焦化废水二级出水的COD、氨氮和色度难以达到《污水综合排放标准》(GB8978—1996)的一级标准的情况,采用铁炭内电解/两级生物滤池对焦化废水二级生化出水进行了深度处理。在最佳条件下,铁炭内电解对COD、TOC、色度、总磷、NH3-N和TN的去除率分别为47.3%、44.2%、93.3%、96.4%、11.3%、10.4%,出水BOD5/COD值从0.17提高到0.31;后续的两级生物滤池对COD的去除率可达到50%以上,系统最终出水COD<60 mg/L、总磷<0.5 mg/L、总氮<25 mg/L、氨氮<1 mg/L、色度<30倍,可达到GB 8978—1996的一级标准。由此可知,铁炭内电解/两级生物滤池处理焦化废水二级出水具有稳定和高效等特点。

Because COD, ammonia nitrogen and color of coking wastewater secondary effluent could not meet the first class criteria specified in the Integrated Wastewater Discharge Standard （ GB 8978 -1996）, iron-carbon internal electrolysis and two-stage biofihers were adopted for the advanced treat- ment of coking wastewater. Under the optimal experimental conditions, the removal rates of COD, TOC, color, TP, NH3 - N and TN by iron-carbon internal electrolysis were 47. 3%, 44. 2%, 93. 3% 96.4% , 11.3% and 10.4% , respectively. The effluent BODJCOD was increased from 0.17 to 0. 31. The COD removal efficiency of two-stage biofihers was more than 50%. The final effluent COD, TP, TN, NH3 - N and color were less than 60 mg/L, 0.5 mg/L, 25 mg/L, 1 mg/L and 30 times, respectively, meeting the first class criteria specified in the Integrated Wastewater Discharge Standard （ GB 8978 - 1996）.