微电解–SBR活性污泥法处理焦化废水

针对焦化废水可生化性差、难以生化处理的特点，采用微电解工艺作为预处理措施，去除部分污染物并提高废水的可生化性，再利用SBR活性污泥法进行了深度处理实验. 结果表明，微电解法不仅能去除焦化废水中的COD、酚、氰、硫化物等有机污染物(COD去除率为70%, 酚、氰、硫化物去除率分别为76.8%, 65.9%, 70.3%)，而且还能提高废水的可生化性(BOD5CODcr由处理前的0.28提高到处理后的0.54，可生化性提高了48.2%). 通过正交试验确定了微电解法预处理焦化废水的适宜参数为：进水COD22002400 mgL，进水pH值约3.03.2，微电解水力停留时间HRT5565 min，FeC(体积比)11.5. 应用微电解预处理SBR深度处理焦化废水，可使出水达标排放(国家I级排放标准GB1345692).

Treatment of Coking Wastewater Using the Micro-electrolysis-SBR Activated Sludge Process

Tests has been carried out on treating coking wastewater using the micro-electrolysis-SBR activated sludge process. The results show that the micro-electrolysis technology not only removes COD, phenol, cyanide, sulfide in the wastewater, but also improves its biodegradability (BOD5/CODcr) from 0.28 to 0.54. With the micro-electrolysis technology, the removal rate of COD, phenol, cyanide, sulfide is up to 70%, 77%, 68%, 71% respectively. By orthogonal test, the best parameters of micro-electrolysis pre-treatment of coking wastewater are: influent COD2200~2400 mg/L, influent pH 3.0~3.2, HRT 55~65 min, volume ratio of Fe/C=1:1.5. Using the micro-electrolysis-SBR bio-treatment technology the effluent water can meet Grade I requirement of the National Discharge Standard (GB13456-1992) for discharging industrial wastewater.