Shandong Key Laboratory of Water Pollution Control and Resource Reuse, School of Environmental Science and Engineering, Shandong University, Ji'nan 250100, China.
Bioresour Technol. 2013 May;136:535-41. doi: 10.1016/j.biortech.2013.03.002. Epub 2013 Mar 14.
In this study, effects of dissolved organic matter (DOM) size fractions on trihalomethanes (THMs) formation in MBR effluents during chlorination were investigated by fractionating DOM into >100, 30-100, 10-30, 5-10 and <5 kDa fractions using ultrafiltration (UF) membranes based on molecular weight (MW). Fractions of MW>30 kDa constituted 87% of DOM and were the main THMs precursors, which exhibited higher specific ultraviolet absorbance (SUVA) and THMs formation potential (THMFP) and should be reduced to control THMs formation. For these fractions, THMs formation was mostly attributed to slow chlorine decay, and THMs yield coefficients were low because halogenated intermediates derived from the macromolecular DOM were difficult to decompose to produce THMs. Moreover, there was a strong linear correlation between dissolved organic carbon (DOC) concentration and THMFP (R(2)=0.981), as well as between the SUVA and specific THMFP (R(2)=0.993) in all fractions.
在本研究中，通过超滤（UF）膜根据分子量（MW）将 DOM 分为>100、30-100、10-30、5-10 和<5 kDa 级分，研究了 DOM 各分数对 MBR 出水中三卤甲烷（THMs）形成的影响。MW>30 kDa 的级分构成了 DOM 的 87%，是主要的 THMs 前体，其表现出更高的特定紫外吸光度（SUVA）和 THMs 生成潜能（THMFP），应该降低以控制 THMs 的形成。对于这些级分，THMs 的形成主要归因于缓慢的氯衰减，并且由于源自大分子 DOM 的卤代中间体难以分解产生 THMs，THMs 产率系数较低。此外，在所有级分中，溶解有机碳（DOC）浓度与 THMFP 之间存在很强的线性相关性（R（2）=0.981），SUVA 与特定 THMFP 之间也存在很强的线性相关性（R（2）=0.993）。
