粉末活性炭-超滤一体化工艺处理微污染水效果

Treatment of micro-polluted water with PAC and ultrafiltration integrated process

采用粉末活性炭(PAC)-超滤(UF)一体化工艺处理微污染水,考察投炭量对浊度、UV254和CODMn去除效果和对膜污染的影响以及有机物去除效果随PAC停留时间的变化。研究结果表明:超滤膜出水浊度保持在0.100 NTU以下,且不受进水浊度以及PAC投加量的影响。在10,20和40 mg/L投加量下,随着PAC投加量增加,有机物去除率逐渐提高,但单位质量PAC有机物去除效果逐渐下降,10 mg/L PAC可以满足试验水质条件下经济性和出水水质的要求。PAC对有机物去除效果随停留时间增加而降低,较高PAC投加量下降幅度较小。PAC-UF工艺可以有效控制膜污染,次氯酸钠与酸、碱形成的复合药剂对跨膜压差恢复效果最佳。

An integrated process of powdered activated carbon （PAC） and ultrafiltration （UF） was used to treat a micro-polluted water. Effects of PAC dosages on turbidity, UV254 and CODMn removal, as well as membrane fouling were investigated. Effects of PAC retention-time on organic removal was conducted simultaneously. The results indicate that the effluent turbidity is under 0.1000 NTU, which could not be influenced by PAC dosage and the turbidity of influent. Organics removal is enhanced with the increase of PAC dosage at 10, 20 and 40 mg/L, but the performance of unit PAC mass is reduced. It could meet the demand of economics and effluent quality at the dosage of 10 mg/L PAC. Organics removal is decreased with the increase of PAC retention-time, and the decline is weaker at a higher dosage. Membrane fouling is reduced with PAC-UF process. A better trans-membrane pressure （TMP） recovery is received for sodium hypochlorite composite with acid or alkali during chemical cleaning.