水中天然有机物对粉末活性炭吸附2-MIB的影响

粉末活性炭(PAC)对2-MIB的吸附过程更接近于Freundich吸附等温模式。用树脂富集方法将松花江水中的天然有机物(NOM)分为憎水性酸(HOA)、憎水性碱(HOB)、憎水中性物(HON)、亲水酸(HIA)、亲水碱(HIB)、亲水中性物(HIN)等六类,原水中有机碳的回收率为84.7%(以TOC计)。不同组分NOM不同程度地降低了PAC的吸附容量。以松花江水为本底,利用等背景化合物模式进行试验,结果表明,活性炭的吸附容量与2-MIB初始浓度成正比。利用HSDM模型能很好地预测PAC吸附松花江原水中2-MIB的动力学过程,在PAC投加量适当的情况下,吸附时间为4h时的吸附量占吸附平衡总量的70%左右,与实测结果接近。

Effect of NOM on PAC absorption of 2-MIB from raw water

The model of Freundich equation matches the PAC adsorption process of 2-MIB be-tter than other equations. Natural organic matters(NOM) from Songhua River were classified by resin enrichment technique into six species, including hydrophobic acid (HOA), hydrophobic base(HOB), hydrophobic neutral(HON), hydrophilic acid(HIA), hydrophilic base(HIB) and hydrophilic neutral(HIN), and the recycling rate of TOC from raw water was about 84.7%.The experiment results showed that each kind of NOM from water will reduce the PAC adsorption capacity. Taking raw water from Songhua River as the background, the simulation results showed that PAC adsorption capacity was linear to the initial concentration of 2-MIB. The HSDM model was also employed to predict the dynamic process of the adsorption of 2-MIB by PAC. The modeling results showed that the adsorption capacity at 4 hours was about 70% of that at adsorption equilibrium if the appropriate PAC dosage was charged, which matched the measured results very well.