氧化铁改性石英砂生物滤池处理微污染原水研究

Treatment of Micro-polluted Raw Water by Iron Oxide Coated Sand Biofilter

采用以氧化铁改性石英砂(简称"改性砂")为滤料的生物滤池处理微污染原水,考察了对有机物和氨氮的去除效果,并与普通石英砂(简称"普通砂")生物滤池的处理效果进行了对比。改性砂和普通砂生物滤池的挂膜成熟时间均为8 d左右;在挂膜期间,改性砂生物滤池对UV254的平均去除率为42.4%,稳定运行期间可达57.3%,而普通砂生物滤池在整个运行期间对UV254的去除率仅为5%左右;在挂膜期间,改性砂生物滤池对氨氮的去除率从2%左右升高至约85%,稳定运行期间对氨氮的去除率保持在86%左右,而普通砂生物滤池出水氨氮浓度波动较大,对氨氮的去除效果不稳定。因此,改性砂比普通砂更适于生物滤池工艺。

Iron oxide coated sand （IOCS） was selected as the filter media of a bio-sand filter （BSF）. The removal of organic matter and ammonia nitrogen from micro-polluted raw water by the IOCSBSF was investigated. The performance of a BSF using raw quartz sand （RQS） was also evaluated. The results showed that the start-up of the BSFs took about 8 days ; the average removal rate of UV2s4 by IOCS- BSF was 42.4% during the start-up stage, and increased to 57.3% during the stable stage, while the removal rate of UV254 by RQS-BSF was only about 5 % during the entire operation. The removal rate of ammonia nitrogen by IOCS-BSF increased from 2% to 85% quickly during the start-up stage, and maintained at 86% during the stable stage, whereas the removal of ammonia nitrogen by RQS-BSF was unstable during the entire operation. Therefore, modified sand filter is more suitable than ordinary sand filter for micro-polluted raw water treatment.