UZBAF处理农村生活污水工艺参数优化研究

Optimization the Parameters of UZBAF for Treatment of Rural Sewage

当前水体污染日益严重,农村生活污水造成的污染所占比例较高。于河北省乐亭县示范基地内采用升流式曝气生物滤池(UZBAF)装置,内径为185cm,内装天然沸石滤料54L,进行了农村生活污水无害化处理研究。结果表明,在水力负荷为2m3/h,停留时间为1.0h的情况下,气水比由2∶1提高到4∶1时,CODCr平均去除率由75.2%提高至83.4%;BOD5去除率提高了5.9%;浊度去除率由91.9%提高至94.8%;NH4+-N平均去除率由82.6%提高至98.1%,出水平均浓度由3.3mg/L降至0.28mg/L;对TN,TP,碱度和电导率的去除率分别达到56.2%,26.7%,27.5%和10.8%,对细菌和蛔虫卵的去除率分别达到99.9%和100%,能达到GB8978—1996《污水综合排放标准》中一级排放标准的要求。所以利用UZBAF装置处理农村生活污水时,在水力负荷为2m3/h,停留时间为1.0h情况下,能实现农村生活污水无害化处理。

The water pollution was increasingly serious recently in China,and the rural sewage pollution accounted for high proportion.The up-flow biological aerated filter（UZBAF）with inner diameter of 185 cm and with 54 L of built-in natural zeolite filter sand was used in the demonstration base for harmless treatment of rural sewage.The results showed that under the conditions of hydraulic loading 2 m3/h and residence time 1.0 h,when the gas-water ratio increased from 2∶1 to 4∶1,CODCr average removal rate increased from 75.2% to 83.4%,BOD5 removal rate increased by 5.9%;turbidity removal rate increased from 91.9% to 94.8%,NH4＋-N average removal rate increased from 82.6% to 98.1%,NH4＋-N average concentration of the effluent fell from 3.3 mg/L to 0.28 mg/L;the removal rate of TN,TP,alkalinity and conductivity was 56.2%,26.7%,27.5% and 10.8%,respectively;and the removal rate of bacteria and ascaris eggs was 99.9% and 100%,respectively.The effluent could reach the target of the first-grade discharge standard of Synthetical Draining Standard of Sewage（GB 8978-1996）.It was concluded that under the conditions of hydraulic loading 2 m3/h and residence time 1.0 h,UZBAF devices could realize harmless treatment of rural sewage.