煤矿生活污水同步硝化反硝化试验研究

Experimental study on the simultaneous nitrification and denitrification of coal mine domestic sewage

为提高煤矿生活污水脱氮效果并优化反应方式,采用限氧曝气生物膜反应器进行试验研究,分析了污染物去除效果和主要影响因素。结果表明:在第一反应室DO为1.5~2 mg/L、第二反应室DO为1~1.5 mg/L、HRT为3.13 h、ρ(COD)=69.8~85.2 mg/L、ρ(NH 4^+-N)=14.6~17.9 mg/L、ρ(TN)=17.3~21.2 mg/L的进水条件下,反应器出水COD、NH 4^+-N、TN最大质量浓度分别为18.3 mg/L、0.23 mg/L和8.92 mg/L,平均去除率分别为80.8%、99.3%和59.3%,同步硝化反硝化效率(SND率)为45.4%~56.5%;在2.78 h≤HRT≤4.17 h范围内,反应器出水COD和NH 4^+-N浓度达到GB 3838—2002Ⅲ类标准要求,出水ρ(TN)<10 mg/L且SND率达到52%。

To improve the nitrogen removal effects of coal mine domestic sewage and reactive mode,a two-stage limited aeration biofilm reactor was used to carry out an experiment.The pollutant removal effects and influencing factors were analyzed.The results indicate:Under the condition that the 1st reaction chamber DO of 1.5~2 mg/L,the 2nd reaction chamber DO of 1~1.5 mg/L,HRT=3.13 h,and the influent quality ofρ(COD)69.8 to 82.5 mg/L,ρ(NH 4^+-N)14.6 to 17.9 mg/L,ρ(TN)17.3 to 21.2 mg/L,the maximal concentrations of COD,NH 4^+-N,and TN in the last effluent were 18.3 mg/L,0.23 mg/L and 8.92 mg/L,with the mean removal rates of 80.8%,99.3%,59.3%and the SND ratio of 45.4%~56.5%.In the HRT rang of 2.78 h to 4.17 h,the effluent concentrations of COD,NH 4^+-N met the CategoryⅢof environmental quality standards for surface water(GB 3838—2002),and the effluent concentration of TN was not more than 10 mg/L with the SND ratio of 52%.