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Influence of Flocculant Aids and NOM Characteristics on the Removal of DBP Precursors During Enhanced Coagulation

機譯：絮凝助劑和NOM特性對強化混凝過程中DBP前驅(qū)物去除的影響

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In this study, two factors potentially influencing the removal of disinfection by-productprecursors during enhanced coagulation were examined: seasonal changes in natural organicmatter (NOM) characteristics and the addition of flocculant aids. Little variation in UV254,organic matter molecular weight, or dissolved organic carbon (DOC) concentration was observedover the course of one year for two Ohio drinking water reservoirs. Subsequently, the dosage offerric chloride required to meet United States Environmental Protection Agency (USEPA)enhanced coagulation requirements varied little as well. The addition of flocculant aids had apositive effect on the removal of the UV-absorbing NOM fraction during enhanced coagulation,at least at high polymer dosages (10 mg/L or greater). The influence of flocculant aids dependedon the charge density of the polymer, with high charge density cationic polymers having thegreatest influence and nonionic flocculant aids having relatively little effect. It was alsoobserved that cationic flocculant aids were significantly more effective at removing the UVabsorbingfraction of Aldrich humic acid in synthetic source water as compared to the UVabsorbingfraction of the natural waters examined. While flocculant aids enhanced UV_(254)removal during ferric chloride coagulation, addition of these polymers did not reduce dissolvedorganic carbon.
機譯：在這項研究中，有兩個因素可能會影響消毒副產(chǎn)物的去除 檢查了增強混凝過程中的前體：天然有機物的季節(jié)性變化 物質(zhì)（NOM）特性和絮凝助劑的添加。 UV254變化不大， 觀察到有機物分子量或溶解的有機碳（DOC）濃度 在一年中為兩個俄亥俄州飲用水水庫。隨后，劑量 符合美國環(huán)境保護局（USEPA）要求的氯化鐵 增強的凝血要求也幾乎沒有變化。絮凝劑的添加有一個 在增強混凝過程中對吸收紫外線的NOM組分的去除有積極作用， 至少在高聚合物劑量下（10 mg / L或更高）。絮凝助劑的影響取決于 在聚合物的電荷密度上，高電荷密度的陽離子聚合物具有 影響最大的是非離子絮凝助劑，作用相對較小。那也是 觀察到陽離子絮凝劑助劑在去除紫外線吸收方面明顯更有效 與紫外線吸收劑相比，合成來源水中的Aldrich腐殖酸的比例 所檢查的天然水的一部分。絮凝劑有助于增強UV_（254） 在氯化鐵凝結(jié)過程中去除，添加這些聚合物不會降低溶解度 有機碳。

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