粉末活性炭回流技术去除原水中氨氮的研究

Study on powdered activated carbon back flow technology in ammonia nitrogen removal from raw water

将含粉末活性炭（PAC）的沉淀池排泥水回流至原水进水处,延长PAC在系统中的停留时间,考察系统对氨氮、有机物和浊度的去除效果及去除氨氮的影响因素。结果表明,在温度为21~25℃,投炭量为50 mg/L条件下,系统第7~8天运行稳定,对氨氮、UV254和CODMn的去除率分别为40%、45%和60%左右,出水浊度在1 NTU左右,活性炭泥的生物量为130 nmolP/g左右。当活性炭泥回流比为6%,原水CODMn不超过10 mg/L,pH为7~8,浊度不超过180 NTU时,对氨氮去除效果最好,为40%~50%,可应对原水氨氮浓度小于1 mg/L的情况。

In this paper,the study on back flow of sludge dispersing wastewater containing powdered activated carbon（PAC） from sedimentation tank to raw water entrance to prolong the retention time of PAC in system had been carried out to investigate the influence factors on ammonia nitrogen,organic matter,and turbidity removal in system.The results showed： when the temperature was between 21 ℃ and 25 ℃ and the PAC dosage of 50 mg/L,the system operation in the 7th and 8th days was stable and the removal of ammonia nitrogen,UV254,and CODMn were about 40%,45%,and 60% respectively,the effluent turbidity was about 1 NTU,and the biomass in PAC sludge was about 130 nmolP/g.When the reflux ratio of PAC sludge was 6%,raw water CODMn was less than 10 mg/L,pH was between 7 and 8,and the turbidity was less than 180 NTU,the ammonia nitrogen removal effect was best,which was between 40% and 50% and could treat the raw water with ammonia nitrogen less than 1 mg/L.