减少前加氯对炭砂复合滤池去除污染物的影响

摘要：以生产规模炭砂复合滤池为对象，研究减少前加氯量对炭砂复合滤池处理水中氨氮、亚硝酸盐氮效果的影响。结果表明：丰水期待滤水余氯月平均含量在0.20~0.88mg/L之间，枯水期适当减少了前加氯量，此时期待滤水余氯月平均含量在0.20mg/L以下。丰水期待滤水溶解氧含量平均值约为3.42mg/L，枯水期为5.49mg/L。枯水期减少了前加氯量，此时期待滤水氨氮含量较丰水期高约0.40mg/L左右，但生化去除效果的提高，使氨氮去除量比丰水期大0.30mg/L左右。枯水期滤后亚硝酸盐氮累积量为0.014mg/L，比丰水期时高约0.010mg/L左右。本试验能给水厂生产工艺改造的可行性和有效性提供依据。

关键词：炭砂复合滤池；前加氯；氨氮；亚硝酸盐氮

Effect on pre-chlorination quantity reduction for water purification of Carbon-sand filter

Luo Guo-rong1 , Sun Xiao-fei2

(CSCEC AECOM CONSULTANTS CO.,LTD , Dongguan 523070,China ; Environmental Science Association of Dongguan , Dongguan 523009)

Abstract: Taking the productive carbon-sand filter as object, this test researched the effect of pre-chlorination quantity reduction on treating NH4+-N, NO2－-N. The results showed that the monthly average of residual chlorine of influent was between 0.20~0.88mg/L in the wet period, and lower than 0.20mg/L in the dry period. The average of DO of influent was 3.42mg/L in the wet period, and 5.49mg/L in the dry period. Pre-chlorination was reduced appropriately in the dry period, NH4+-N of influent was higher than it in the wet period by about 0.40mg/L, but the removal quantity of NH4+-N were more than it in the wet period by about 0.30mg/L. The accumulation quantity of NO2－-N of effluent were 0.014mg/L in the dry period, higher than it in the wet period by about 0.010mg/L. This test provided basis for water plants with the feasibility and effectiveness of production technology transforming.

Key words: Carbon-sand filter; Pre-chlorination; NH4+-N; NO2－-N

前言

增加颗粒炭滤层把普通砂滤池改造成生物滤池，生化去除污染物，解决源水污染日益加重以致难以保证出水水质的问题。然而，活性炭对水中的余氯有吸附作用，而余氯对活性炭表面上的生物膜会产生极大的破坏，抑制微生物生长，影响池内生物作用的发挥，因此炭滤池一般不能进行前加氯。但由于在南方湿热地