微污染原水的生物接触氧化预处理研究

Research on Pretreatment of Micro-Polluted Source Water by Biological
Contact Oxidation Process
ZHANG Dong，XU Jian-hua，LIU Hui
(School of Environ.Sci.and Eng.,Tongji Univ.,Shanghai 200092,China)

　　Abstract： Experimental research on pretreatment of polluted raw water with higher turbidity and higher ammonia-N concentration by biological contact oxidation process (B COP) with elastic packing was conducted and compared with conventional water treatment process.Experimental results showed that removal rates of ammonia-N,COD_Mn,and UV254 were 60%～80%,0.5%～25%,and 1%～15% respectively at raw water turbidity of 50～200NTU,ammonia-N concentration of 1～10mg/L and temperature of 18～30 ℃.During the test, higher turbidity (from 200 NTU to 800NTU) of raw water had no significant effect on removal efficiency of ammonia-N and COD_Mn.Nitrite removal rate was 20%～50%,but nitrite accumulation took place when ammonia-N concentration was rather high.With the BCOP,pollutants removal effects of subsequent sedimentation tank and rapid sand filter could be improved.
　　Keywords: micro-polluted source water;pretreatment;biological contact oxidation

　　1 工艺流程对比

　　① 中试工艺流程

　　② 水厂常规生产工艺流程

　　2 运行参数和挂膜情况

　　生化池采用YDT型弹性立体填料，装填高度为3.7m，进水流量为1m³/h，停留时间为1.1h，池底设微孔曝气器，气水比为(0.5～1.0)∶1。原水的浊度较高，水温17～20℃时，采用自然挂膜约需21d，此时的氨氮去除率约为60%。装置24h连续运行，混凝沉淀池投加PAC为10 mg/L，砂滤池反冲洗周期为12h。生化系统运行期间水温18～30℃。

　　3 原水水质和分析测定方法

　　① 原水水质(见表1)

表1 黄浦江支流某河的原水水质(1998年)

测定项目	浓度范围	年平均值
浊度(NTU) 氨氮(mg/L) CODMn(mg/L) 亚硝酸盐氮(mg/L) 溶解氧(mg/L)	48～1000 0.6～14 2.0～8.0 0.080～0.642 2.11～11.89	147 3.3 4.1 0.175 6.50

　　从表1数据可知其受污染情况较严重，氨氮和亚硝酸盐氮浓度高。
　　② 分析测定方法
　　浊度：HACH2100型浊度仪；
　　氨氮^［1］：纳氏试剂分光光度法；
　　COD_Mn^［1］：酸性高锰酸钾法；
　　亚硝酸盐氮^［1］：对氨基苯磺酸—α-萘乙二胺光度法；
　　溶解氧：溶解氧测定仪。

[1] [2] [3] 下一页