粉末活性炭投加量对原水中有机物的去除及其分子量分布的影响

摘要

采用粉末活性炭(PAC)对宜兴市西沈水源水进行预处理.考察了不同PAC投加量对溶解性有机碳(DOC)、UV254及SUVA的去除以及原水有机物分子量分布的影响.结果表明,DOC、UV254及SUVA的去除均随着PAC投加量的升高而增加;当PAC投加量＜30 mg/L时,PAC会优先吸附原水中小分子量的天然有机物(NOM);当PAC投加量达到80 mg/L后,原水中分子量超过10 k的大分子NOM的去除率最高,且PAC投加量在0～100 mg/L范围内时,分子量在3～10 k范围内的NOM去除率均随着PAC投加量的升高而增加.%Powdered activated carbon was used to pretreat the Xijiu River water in Yixing City.The effects of different PAC dosages on dissolved organic carbon (DOC),UV254 and SUVA were investigated.The results indicated that the removal rate of DOC,UV254 and SUVA were all increased as the PAC dosage increased.When PAC dosage was not exceeding 30 mg/L,natural organic matter (NOM) with small molecular weight were preferably adsorbed by PAC.Once the dosage was above 80 mg/L,PAC mainly absorbed macromolecular NOM that the molecular weight was above 10 k.In addition,the removal rate of NOM,which with molecular weight ranges from 3k～10k,also increased with the PAC dosage increased.