摘要
对于难生物降解的氯苯废水的处理,首先利用本实验室成员筛选的高效氯苯降解混合菌WCB（该菌群氯苯耐受度〉150 mg/L）为接种菌群,对流化床载体接种挂膜培养,待出水氯苯降解率稳定后转入正常运行及最佳操作条件考察期。实验结果表明,该菌群与新型内循环流化床耦合,对氯苯有很好的去除效果（氯苯去除率可达84%）。活性炭、烧结陶粒比沸石更利于氯苯菌的生长;较高的pH值8或低pH值（4.5～6）时均能达到较好的去除效果,但在pH值为中性时去除效果却不理想;相对于易降解的油脂废水来讲,降解氯苯废水所需的水力停留时间HRT要长许多,在8～10 h方可达到满意的去除效果;最佳曝气量为1.4～1.8 L/m in;在20～40目活性炭载体投加率为7%时,该流化床处理氯苯的最佳浓度范围为20～65 mg/L,此时氯苯去除率〉75%。
For chlorabenzene wastewater treatment, firstly the highly effect chlorabenzene degradation mixed bacteria WCB was used as inoculation bacteria. These mixed bacteria were abstracted by our laboratory member, which can survive in the liquor with chlorabenzene concentration of 150 mg/L. After making the biofilm form on the biological carriers and chlorobenzene removal rate stabilizing, the ICBFBs were shifted to run in gear and debug the operational conditions. The experiment results indicated that the WCB bacteria coupling with the new ICBFB brought very good chlorabenzene removal rate （ 〉 84 % ）. Active carbon, agglomerate ceramsite were more benefit for WCB＇s growth than zeolite. When the value of pH was higher （8） or lower （4.5 ～ 6） , the satisfied results were obtained, while the value of pH was neutral the removal rate were not good enough. Comparing with the oil wastewater, HRT for chlorabenzene wastewater was longer lots. The removal rate were not satisfied until the HRT was prolonged to 8 ～ 10 h. The optimum gas flux was 1.4 - 1.8 L/min when 20 ～ 40 mesh active carbon was selected as biological carriers with loading of 7 %, the optimum treatment chlorabenzene range was 20 ～ 65 mg/L, with the degradation rate higher than 75 %. Employing the new type ICBFB to treat both degradable and nondegradable wastewater, the satisfied results was gotten. Those experiments provide credible data for application widely of Biological Fluidized Bed in the future.
出处
《辽宁化工》
CAS
2007年第8期558-562,共5页
Liaoning Chemical Industry
关键词
内循环生物流化床
载体
生物膜
氯苯废水
Inner circulation biological fluidized bed （ICBFB）
Carrier
Biofilm
Chlorabenzene wastewater
