光合细菌强化二级流化床工艺处理焦化废水的研究

Study on treatment of coking wastewater using process of photosynthetic bacteria enhanced two-stage of fluidized beds

采用厌氧酸化加二级流化床组合工艺处理焦化废水。一级反应器内光合细菌与兼性厌氧菌处于共生状态,二级反应器内光合细菌与亚硝酸细菌处于共生状态。一级反应器内光合细菌有充分的小分子有机酸可降解并形成二次酸化,在二级反应器内完成进一步降解。结合反应条件:温度,pH,DO和基质浓度等,将二级反应器内硝化反应控制在亚硝化阶段,有效地保证了废水中碳源的利用。稳定运行了60 d,结果显示,出水COD和NH3-N浓度分别为105~135 mg/L和14~20 mg/L,去除率分别稳定在90.3%~92.5%和92%~95%。TN去除率稳定在83%~86%。酚、氰化物和BOD5的去除率均在95%以上。

The process of anaerobic acidification with fluidized beds was adopted to treat coking wastewater. The intergrowth of photosynthetic bacteria and hydrolytie-acidogenic bacteria was in the first reactor, and the intergrowth of photosynthetic bacteria and nitrite bacteria was in the second reactor. After the abundant low-molecule weight organic acid decreased by photosynthetic bacteria and macromo]ecule organic matter second- hydrolyzed in the first reactor, the second treatment was completed in the second reactor. With some conditions as temperature,pH^DO,concentration of substrate ere, short-cut nitrification was achieved in the second reactor so that the carbon source was used effectively. The results from the steady run after two months were analysed, and the concentrations of effluent COD and NH3-N were 105 -135 mg/L and 14 -20 mg/L respectively, with the removal rates of 90. 3% -92.5% and 92% -95%. The removal rate of TN was the range of 83% - 86% , the removal rates of phenol,cyanide and BOD5 were more than 95%.