颗粒活性炭吸附对预臭氧后微污染原水水质影响研究

在不同的预臭氧浓度条件下处理微污染原水,考察了颗粒活性灰（GAC）吸附对处理后水样水质的影响.选择化学需氧量（CODMn）、溶解性有机碳（DOC）、生物可降解溶解性有机碳（BDOC）、UV254和氨氮（NH;-N）含量及有机物分子量分布作为考察吸附效果的检测指标.结果表明,在静态吸附时间达到5天时,颗粒活性炭吸附曲线开始趋于平缓,吸附时间超过5天之后吸附趋于饱和;预臭氧含量为2.5 mg/L时,颗粒活性炭对有机物的吸附效果最佳,对CODMn、DOC、BDOC的去除率分别为53.2％,63.2％和36.2％;在不同预臭氧处理条件下,颗粒活性炭对NH;-N的吸附效果并未表现出较大的差异,吸附去除率约为5％;颗粒活性炭优先吸附水中分子量＞ 10kDa的有机物,其次为分子量＜1 kDa的有机物.

Study on the adsorption effect of micro-polluted raw water quality by granular activated carbon after preozonation

Different preozonation concentrations were used to treat micro-polluted raw water, the influence of adsorption by granular activated carbon （ GAC ） on treated water quality was investigated. The adsorption effects of chemical oxygen demand （CODMn）, dissolved organic carbon （DOC）, biodegradable dissolved organic carbon （ BDOC ） , UV254, NH4 - N and molecular weight （ MW ） distribution of organic matter were selected as detection objects. The results showed that GAC adsorption curve gentlely inclined at 5 d of static adsorption time, and displayed adsorption saturation after more than 5 d of static adsorption time. GAC showed highest adsorption effect of organic matter with preozonation concentration of 2. 5 mg/L when CODMn, DOC, BDOC adsorption removal rates were 53.2%, 63.2% and 36.2% respectively. Adsorption effect of NH4 - N by GAC did not show big difference under different preozonation concentrations and the adsorption removal rate was about 5%. GAC had priority adsorption of MW 〉 10 kDa organic matters, followed by MW 〈 1 kDa organic matters.