新型上向流轻质滤料滤池在常规工艺中的运行效能

Operational Efficiency of a Novel Upflow Biostyrene Filter in Conventional Drinking Water Process

采用一种以聚苯乙烯泡沫滤珠为滤料的新型上向流轻质滤料滤池中试装置处理某大学校园内的湖水,将滤速控制在8 m/h,重点关注进出水中浊度、色度、COD_(Mn)、氨氮和叶绿素a的变化情况,并与石英砂滤池(滤速为7 m/h)的处理效能进行对比;同时,比较了运行前与冲洗后的清洁滤层过滤水头损失,并对其冲洗方法进行了评价。结果表明,由于上向流过滤方式和聚苯乙烯泡沫滤珠具有良好的粒径均匀性,新型滤池对湖水表现出了较好的处理效能,对浊度、色度、COD_(Mn)、氨氮和叶绿素a的平均去除率分别为95.9%、84.6%、35.0%、24.5%和75.2%,比石英砂滤池分别提高了3.3%、0、9.0%、5.6%和12.9%;“气冲-泄空-水冲”的新型冲洗方法简单有效,冲洗后的平均清洁滤层过滤水头损失为8.1 cm,仅比运行前提高了3.8%。

A novel pilot‑scale upflow biostyrene filter packed with polystyrene foamed beads was employed to treat the lake water in a university campus.The filtration velocity was regulated at 8 m/h,and the variations of turbidity,chroma,COD_(Mn),ammonia nitrogen,and chlorophyll a in the influent and effluent were monitored.The treatment efficiency of this filter was compared with that of a quartz sand filter with a filtration velocity of 7 m/h.Meanwhile,the filtration head loss of the clean filter layer prior to operation and after washing was compared,and the washing method was evaluated.Owing to the excellent uniformity of particle size achieved by the upflow filtration method and polystyrene foamed beads,the novel filter demonstrated a remarkable treatment efficiency on the lake water.The average removal efficiencies of turbidity,chroma,COD_(Mn),ammonia nitrogen,and chlorophyll a were 95.9%,84.6%,35.0%,24.5%,and 75.2%respectively.In contrast to the quartz sand filter,they were increased by 3.3%,0,9.0%,5.6%,and 12.9%respectively.The new flushing approach of“air blowing-emptying-water flushing”was straightforward and effective.The average filtration head loss of the clean filter layer after flushing was 8.1 cm,which was merely 3.8%higher than that before operation.