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Interaction of ozone and organic matter in coagulation with inorganic polymer flocculant-PACl: Role of organic components

機(jī)譯：臭氧和有機(jī)物在與無機(jī)高分子絮凝劑-PACl混凝中的相互作用：有機(jī)成分的作用

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In this study, two model waters were used to evaluate the ozone effect on aquatic organic matter (AOM) removal by coagulation with inorganic polymer flocculant (IPF)-polyaluminum chloride (PACl). Flocs formation during coagulation processes were detected by using PDA (Photometric Dispersion Analyzer). Apparent molecular weight distribution (AMWD) and resin fractionation (RF) were also performed to characterize the change of AOM as a result of pre-ozonation. The experimental results show that the dosage Of O(3), characteristics and composition of AOM are the most important factors on the behavior of coagulation. Great differences have been found between the two model waters. Coagulation in model water 1 (MW1) (composed of humic acids) is impaired markedly by pre-ozonation, as more DOC (Dissolved Organic Carbon) is produced with increasing O(3) dosage. Floc formation, as exhibited from decreasing of the slopes of A (Flocculation Index), is retarded gradually during coagulation process. Although residual turbidity is reduced with 1.15 mg/L O(3), removals of DOC and UV(254) all decreased. As for model water 2 (MW2) (composed of salicylic acid), A is retarded also, but turbidity and DOC removals of coagulation after pre-ozonation are improved to a certain extent. Coagulation performance judged from removal of DOC is improved distinctly by pre-ozonation. Fractionation results show that molecular weight of organic matter (OM) of MW1 is converted from higher to lower: and OM becomes from more hydrophobic to more hydrophilic, which might be one of the mechanisms involved in the impairment of ozonation on coagulation effect. OM in MW2 is oxidized and mineralized to a greater extent, thus its impairment on coagulation is released. Finally, according to water properties, some proposed applications were provided for application of ozone in water treatment process. (C) 2009 Elsevier B.V. All rights reserved.
機(jī)譯：在這項(xiàng)研究中，使用兩種模型水來評(píng)估臭氧對(duì)無機(jī)聚合物絮凝劑（IPF）-聚氯化鋁（PACl）的凝結(jié)作用對(duì)去除水生有機(jī)物（AOM）的影響。通過使用PDA（光度分散分析儀）檢測(cè)凝結(jié)過程中的絮凝物形成。還進(jìn)行了表觀分子量分布（AMWD）和樹脂分餾（RF）以表征由于預(yù)臭氧化而引起的AOM的變化。實(shí)驗(yàn)結(jié)果表明，O（3）的用量，AOM的特性和組成是影響混凝行為的最重要因素。在兩個(gè)模型水之間發(fā)現(xiàn)了很大的差異。預(yù)臭氧處理顯著削弱了模型水1（MW1）（由腐殖酸組成）中的混凝作用，因?yàn)殡S著O（3）劑量的增加，將產(chǎn)生更多的DOC（溶解的有機(jī)碳）。從A的斜率（絮凝指數(shù)）的減小所表現(xiàn)出的絮凝形成在凝結(jié)過程中逐漸被延遲。盡管殘留濁度隨著1.15 mg / L O（3）的降低而降低，但DOC和UV（254）的去除均降低了。至于模型水2（MW2）（由水楊酸組成），A也受阻，但在預(yù)臭氧化后混濁度和DOC的去除率得到一定程度的改善。通過預(yù)臭氧處理，從去除DOC判斷出的混凝性能得到明顯改善。分餾結(jié)果表明，MW1的有機(jī)物（OM）分子量從較高轉(zhuǎn)化為較低：OM從更疏水變?yōu)楦H水，這可能是臭氧氧化對(duì)凝血效果的影響之一。 MW2中的OM被更大程度地氧化和礦化，因此釋放了其對(duì)凝結(jié)的損害。最后，根據(jù)水的性質(zhì)，為臭氧在水處理過程中的應(yīng)用提供了一些建議的應(yīng)用。 （C）2009 Elsevier B.V.保留所有權(quán)利。

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