作　　者： (刘清华）; (陈丽珠）;

机构地区： 东莞市东江水务有限公司,广东东莞523000

出　　处： 《供水技术》 2017年第4期17-20,共4页

摘　　要： 在当前原水氨氮日益升高的情况下,优化砂滤池对氨氮的处理效果尤为关键。在原水中投加NaOH和NH4Cl溶液,中试结果表明:投加NaOH溶液后,原水pH值上升至8.5左右,而待滤水pH值只上升至7.6左右;滤后水DO的高低与滤池处理效果呈现一定的正相关。待滤水氨氮为0.91~1.90 mg/L,未投加NaOH溶液时,待滤水pH值在6.80~7.00,砂滤池对氨氮的平均去除率为54.81%;待滤水氨氮为1.25~1.91mg/L,投加NaOH溶液后,待滤水pH值在7.02~7.68之间,砂滤池对氨氮的平均去除率为70.26%。当待滤水氨氮升高至2.0mg/L时,滤后水中没有明显的NO-2-N积累,而当原水水质明显变差,待滤水氨氮升至2.38~3.21mg/L时,氨氮处理效果受到DO影响,NO-2-N有一定的积累。投加NaOH溶液一段时间后,即使待滤水浊度有较大幅度的升高,滤后水浊度均能稳定在0.3 NTU以下,显示出对浊度较好的去除效果。 It is especially important to optimize the treatment effect of sand filter under an increasing ammonia nitrogen in raw water. NaOH and NH4C1 solution were added to the raw water, and the pilot test results showed that pH of raw water rose to about 8.5, but the pH of filter inflow was only about 7.6. The filter treatment effect was positively correlated with the DO of outflow. When the concentration of inflow ammonia nitrogen was 0.91 -1.90 mg/L, pH of filter inflow was between 6.80 -7.00, and the average removal rate of ammonia nitrogen by sand filter was 54.810/0 without adding NaOH solution, pH of filter inflow of 7.02 - 7.68 and the average removal rate of 70.26% were obtained through experiment when inflow ammonia nitrogen was 1. 25 - 1.91 mg/L and NaOH solution was added. No obvious NO2- - N accumulation in filtered water was observed when inflow ammonia nitrogen was climbed to 2.0 mg/L. However, inflow ammonia nitrogen of 2.38 - 3.21 mg/L could reduce treatment effect which was affected by DO and lead to certain NO2- - N accumulation. After adding the NaOH solution, the filtered water turbidity could stay stably under 0.3 NTU even under the condition of some high inflow turbidity.

关 键 词： 砂滤池 高氨氮 溶液 中试