Natural organic matter (NOM) and pesticides removal using a combination of ion exchange resin and powdered activated carbon (PAC)
Natural organic matter (NOM) and pesticides removal using a combination of ion exchange resin and powdered activated carbon (PAC)
复制标题
DOI：
10.1016/j.watres.2007.10.012
复制
发表时间：
2008-03-01
期刊：
影响因子：
12.8
通讯作者：
Croue, Jean-Philippe
中科院分区：
文献类型：
--
作者：
Humbert, Hugues;Gallard, Herve;Croue, Jean-Philippe
研究了阴离子交换树脂（AERs）与粉末活性炭（PAC）联用去除天然有机物（NOM）和农药的效果。实验进行了高溶解性有机碳（DOC）的地表水（约6.0毫克DOC/L）与莠去津和异丙隆加标。AER，如MIEX（R）和IRA 938（R），在30分钟接触时间后显示高达75%的DOC去除。投加PAC后，DOC残留量仅从1.4 mg/L降至1.2 mg/L。高（200 μ g/L）和低（1 μ g/L）的初始农药浓度进行的实验表明，同时和连续的AER和PAC的组合显着提高去除这两种农药相比，PAC处理原水。短期吸附动力学的改善被解释为农药的吸附AERs（约5%）和去除高分子量（MW）NOM结构的AERs，减少孔堵塞现象。对于与PAC接触时间为24 h的情况（吸附等温线），AER处理的效益较低，这表明难降解DOC对AER处理仍然通过直接的位点竞争机制进行竞争。MIEX（R）树脂具有独特的行为，因为与PAC同时处理显示对农药吸附没有益处。MIEX（R）的细小残留物的存在被证明会干扰PAC吸附。(c)2007爱思唯尔有限公司版权所有。
The combination of anion exchange resins (AERs) and powdered activated carbon (PAC) was studied to remove both natural organic matter (NOM) and pesticides. Experiments were conducted with high dissolved organic carbon (DOC) surface water (about 6.0 mg DOC/L) spiked with both atrazine and isoproturon. AERs, like MIEX (R) and IRA938 (R), showed up to 7S% removal of DOC after 30 min contact time. The addition of PAC after treatment with these AERs only slightly decreased the residual DOC from 1.4 to 1.2mg/L. Experiments conducted with high (200 mu g/L) and low (1 mu g/L) initial pesticide concentrations showed that simultaneous and successive combinations of AER and PAC significantly improve the removal of both pesticides compared with PAC treatment on raw water. The improvement of short-term adsorption kinetics was explained by the adsorption of pesticides on AERs (about 5%) and the removal of high molecular weight (MW) NOM structures by AERs that reduce pore blockage phenomena. For 24h contact time with PAC (adsorption isotherms), the benefit of AER treatment was lower, which indicates that the refractory DOC to AER treatment still competes through direct site competition mechanism. MIEX (R) resin had a distinct behavior since the simultaneous treatment with PAC showed no benefit on pesticide adsorption. The presence of fine residues of MIEX (R) was shown to interfere with PAC adsorption. (c) 2007 Elsevier Ltd. All rights reserved.