煤化工废水硝化菌系统异常处理总结

Summary of abnormal treatment of nitrobacteria system in coal chemical wastewater

煤化工废水具有氨氮浓度高,碳氮比失调的特点,易受外部物质影响造成生化系统受到冲击,外排氨氮超标。2022年10月中旬,华鹤公司煤化工项目生化池出水氨氮突然升高,后续硝化系统崩溃。经调查发现是硫化物造成的硝化菌抑制,通过小试试验获知:硫化物造成的影响是瞬时冲击,目前系统内硝化菌抑制物为高浓度游离氨,系统硝化菌已经全部被灭活失效。根据小试试验制定调整措施,快速恢复硝化系统及脱氮功能,并在恢复调试过程中优化工艺参数,反硝化阶段减少了约30%的甲醇投加量.

Coal chemical wastewater has the characteristics of high concentration of ammonia nitrogen,carbon-nitrogen ratio imbalance,which is easy to be affected by external substances,resulting in the impact of the biochemical system,and the discharge of ammonia nitrogen exceeds the standard.In the middle of October 2022,the ammonia nitrogen in the biochemical pool of Huahe Company effluent suddenly increased,and the nitrification system collapsed later.After investigation,it was found that the inhibition of nitrification bacteria was caused by sulfide.Through the small test,it was learned that the impact of sulfide is instantaneous.At present,the inhibitor of nitrification bacteria in the system is high concentration of free ammonia,and all the nitrification bacteria in the system have all been inactivated and failed.Adjustment measures were formulated according to the small test to quickly restore the nitrification system and denitrification function.The process parameters were optimized during the recovery and the methanol dosage during denitrification stage is reduced by about 30%.