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首页> 外文会议>2011 water quality technology conference amp; exposition: An Oasis of Ideas for a Changing Environment. >Combined disinfectant byproduct precursor and micropollutant removal with superfine powdered activated carbon
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Combined disinfectant byproduct precursor and micropollutant removal with superfine powdered activated carbon

机译：结合消毒副产品前体和超细粉状活性炭去除微污染物

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The main objective of this research is to evaluate the effectiveness of powdered activated carbonrn(PAC) adsorption processes for natural organic matter (NOM) and disinfection byproduct (DBP)rnprecursor removal. An additional objective is to evaluate whether PACs that are effective forrnDBP precursor removal are also a good choice for the removal of trace organic compounds suchrnas the taste and odor compound 2-methylisoborneol (MIB) and the antimicrobial compoundrnsulfamethoxazole (SMX). Factors being investigated include (1) PAC base material andrnactivation method (coal, lignite, coconut, thermally activated wood, chemically activated wood)rnand (2) PAC particle size (as-received PAC and superfine PAC (S-PAC) produced from each asreceivedrnPAC). Using batch kinetic tests, PAC performance was evaluated with drinking waterrnsources from North Carolina, Colorado, Florida, and Kentucky.rnAmong the as-received PACs, trihalomethane (THM) and haloacetic acid (HAA) precursorrnremovals were highest with a chemically activated wood-based PAC (16% and 28%,rnrespectively, with a 15 mg/L PAC dose after 60 minutes of contact in North Carolina water).rnTHM and HAA precursor removals were <6% with coconut shell- and bituminous coal-basedrnPACs. For the same contact time and PAC dose, MIB (SMX) removals ranged from 34% (22%)rnfor coconut shell-based PAC to 69% (57%) for thermally activated wood-based PAC. With SPACs,rnremovals of all measured parameters increased dramatically. For example, a superfinernversion of the coconut shell-based PAC produced the following removals with a 15 mg/L dosernafter 60 minutes of contact: 34% for THM precursors, 43% for HAA precursors, 94% for MIB,rnand 98% for SMX. Physical adsorbent characterization showed that the wet-milling process ledrnto a small decrease in micropore volume and, for four of the five carbons, to a dramatic increasernin mesopore volume. Therefore, it is hypothesized that enhanced DBP precursor removal by SPACrnwas a combined result of faster adsorption kinetics (smaller particle size, larger mesoporernvolume) and higher adsorption capacity (larger mesopore volume). Overall, the results obtainedrnhere suggest that a reasonable S-PAC dose (15 mg/L) can produce meaningful DBP precursorrnremovals as well as excellent control of trace organic compounds.
机译：这项研究的主要目的是评估粉末状活性炭（PAC）吸附工艺对天然有机物（NOM）和消毒副产物（DBP）前体去除的有效性。另一个目标是评估有效去除rnDBP前体的PAC是否也是去除痕量有机化合物（例如味和味化合物2-甲基异冰片醇（MIB）和抗菌化合物rnsulfamethoxazole（SMX））的良好选择。研究的因素包括（1）PAC基材和活化方法（煤，褐煤，椰子，热活化木材，化学活化木材）和（2）PAC粒度（按原样获得的PAC和超细PAC（S-PAC）） asreceivedrnPAC）。通过批量动力学测试，使用了来自北卡罗来纳州，科罗拉多州，佛罗里达州和肯塔基州的饮用水源对PAC的性能进行了评估。 PAC（分别与北卡罗莱纳州水中接触60分钟后15％/ L PAC剂量分别为16％和28％）。椰子壳和烟煤型rnPAC的THM和HAA前体去除率<6％。对于相同的接触时间和PAC剂量，MIB（SMX）的去除范围从椰子壳基PAC的34％（22％）rn至热活化木基PAC的69％（57％）。使用SPAC时，所有测量参数的去除都大大增加。例如，基于椰子壳的PAC的超精制版本在接触60分钟后以15 mg / L的剂量产生了以下去除效果：THM前体为34％，HAA前体为43％，MIB为94％，SMX为98％ 。物理吸附剂的表征表明，湿磨过程导致微孔体积小幅下降，并且对于五个碳中的四个，中孔体积急剧增加。因此，假设通过SPACrn提高的DBP前体去除是更快的吸附动力学（较小的粒径，较大的中孔体积）和较高的吸附容量（较大的中孔体积）的综合结果。总体而言，此处获得的结果表明合理的S-PAC剂量（15 mg / L）可以产生有意义的DBP前体去除以及对痕量有机化合物的出色控制。

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