A/O1/H/O2工艺处理焦化废水硝化过程的实现及其抑制

针对焦化废水中的有毒污染物会对敏感易受干扰的硝化细菌产生不利影响从而破坏硝化过程稳定性的现象,采用A/O1/H/O2工艺处理焦化废水的实际工程为研究对象,根据工程运行的水质监测数据分析,发现几种主要污染物的浓度变化会对二级好氧段的硝化过程产生抑制影响。序批式毒性抑制实验结果表明,苯酚、硫氰化物和喹啉对硝化过程具有毒性抑制作用,半抑制浓度EC50分别为34.26、278.5和73.24 mg/L。当二级好氧工艺段运行正常时（C/N约4.3/1,pH8～8.5,DO 4～4.5 mg/L）,出水氨氮浓度可低于5 mg/L,是由于焦化废水经厌氧/好氧/水解工艺后毒物浓度大幅下降,毒性得到削减,表明焦化废水生物处理A/O1/H/O2组合流化床工艺具有较强抵抗毒物抑制并实现高效的硝化作用。

Achievement and inhibition of nitrification in coking wastewater treatment by A/O_1/H/O_2 processes

Toxic pollutants from coking wastewater have negative impacts on nitrifying bacteria and can undermine the stability of nitrification process.This study investigated a wastewater treatment technique of A/O1/H/O2 based on the water monitoring data,several major pollutants were found to have inhibitory effect on nitrification in the second aerobic fluidized bed.The result indicated that phenol,SCN-and quinoline could inhibit the nitrification process,EC50 values of the pollutant were 34.26,278.5 and 73.24 mg/L,respectively.In order to reach the optimum operating condition of the secondary aeration process,C/N ratio should be 4.3/1,pH 8～8.5 and DO 4～5 mg/L,under this condition ammonia level in the effluent was less than 5 mg/L.It showed that the coking wastewater biological treatment adopting A/O1/H/O2 could hold strong anti-inhibitory effect of toxic pollutants and also achieved low-power high-performance nitrification.