前砂滤池在生物活性炭净水工艺中效果研究

Study on the Effect of Former Sand Filter in the Biological Activated Carbon Purification Process

将曝气生物活性炭滤池过滤组合工艺与中置曝气生物活性炭工艺进行对比,通过检测各工艺构筑物出水浊度、COD_(Mn),不同滤速下炭滤池水头损失等参数,验证前砂滤池在生物活性炭工艺中存在的必要性。前砂滤池对浊度的去除率高达92.61%,出水浊度基本在0.3 NTU以下,对延长炭滤池中活性炭寿命有重要作用;前砂滤池对COD_(Mn)的去除率为18.63%,能为炭滤池减轻有机负荷;砂滤池存在的情况下,保持滤速稳定,炭滤池的水头损失基本稳定,反冲洗周期得到延长,而无砂滤池存在时,炭滤池水头损失增长较快,反冲洗周期较短。

Comparing aerated biological activated carbon filter combined process with mid positioned aerated biological activated carbon filter process, testing the turbidity and CODMn concentration of the effluent of each structures and the head loss of carbon filter in different filter speed, the necessity of the former sand filter in the biological activated carbon process was verified. The removal rate of turbidity by the sand filter was 92.61%, the turbidity of the effluent was basically below 0.3 NTU, which was important to prolong the life of activated carbon. The removal rate of CODMn by the former sand filter was 18.63%, which could lighten the organic load of carbon filter. When sand filter was present, maintain filtration rate stability, the head loss of carbon filter was basically stable, the back washing cycle was prolonged, when there was no sand filter exist, carbon filter head loss increased fast, and its back washing cycle was relatively short.