气提式连续砂滤池生物预处理试验研究

Gas lift continuous sand filter biological pre-treatment experiment study

东莞石碣水厂原水取自东江南支流,其水质较差(氨氮、CODMn等超地表Ⅲ类水标准),仅采用常规处理工艺已难以达到《生活饮用水卫生标准》(GB 5749—2006)。通过中试研究了气提式连续砂滤池的生物预处理效果。试验结果表明,气提式连续砂滤去除氨氮效果较好,抗氨氮冲击负荷能力较强,在保持滤速为10～12m/h,砂层厚度3.2m,气水比0.2～0.3;气提量0.04m3/(m3.d)条件下,氨氮的平均去除率达到了70%。另外,CODMn、浊度、铁、锰等指标的平均去除率也分别达到15%、50%、45%和40%。

The water resource for the Dongguang Shijie Water Treatment Plant is trom me south branch of Dongjiang River. Water quality in this water resource was relatively rigorous （ammonia nitrogen, CODMn exceeded the Ⅲ surface water limits）, and it was difficult to meet the ＂Standards for drinking water quality （GB 5749-2006）＂ only using the conventional process. The biological pre-treatrnent effect of the gas lift continuous sand filter was tested by pilot study. The results showed, the gas lift continuous sand filter had a good ammonia nitrogen removal effect and strong ammonia nitrogen impact load resistance, and the filter rate was 10-12 m/h if the sand layer was 3.2 m thick and the gas-water ratio was 0.2-0. 3; if the gas lifting rate was 0. 04 m^3/ （m^3·d）, the ammonia nitrogen average removal rate reached 70%. In addition, the average removal of the indexes, such as CODMn, turbidity, ferrum, and manganese, reached 15%, 50%,45 %, and 40% respectively.