Galapate R P, Baes A U, Okada M
Natural Sciences and Mathematics Division, University of the Philippines in the Visayas, Cebu College, Lahug, Cebu City.
Water Res. 2001 Jun;35(9):2201-6. doi: 10.1016/s0043-1354(00)00489-9.
Transformation of dissolved organic matter (DOM) during ozonation results in a higher reduction in trihalomethane formation potential (THMFP) relative to dissolved organic carbon (DOC). This study was conducted to determine the effect of DOM transformation after ozonation on THM formation and to elucidate the difference in THMFP and DOC removal. Changes in DOC, THMFP, reactivities of the hydrophilic and hydrophobic DOC, and phenolic-OH were determined to explain the difference in THMFP and DOC removal after ozonation. Higher reduction in THMFP (24-46%) relative to DOC (10-16%) was obtained and was attributed to the following: transformation of DOM from a more reactive hydrophobic DOC (microg THM produced per mg organic carbon) to a less reactive hydrophilic DOC and to the decrease in the reactivities of both the hydrophobic and hydrophilic DOC after ozonation. The results also showed decrease in phenolic-OH indicating the oxidation of some reactive sites like resorcinol or meta-dihydroxy benzene ring structures, which are prone to chlorine substitution, consequently decreasing the reactivity of the organic carbon to form THM. These changes in DOM led to a significant decrease in THMFP with no remarkable removal in DOC.
臭氧化过程中溶解有机物（DOM）的转化导致相对于溶解有机碳（DOC），三卤甲烷生成潜力（THMFP）的降低幅度更大。本研究旨在确定臭氧化后DOM转化对三卤甲烷形成的影响，并阐明THMFP和DOC去除率的差异。测定了DOC、THMFP、亲水性和疏水性DOC的反应活性以及酚羟基的变化，以解释臭氧化后THMFP和DOC去除率的差异。相对于DOC（10 - 16%），THMFP的降低幅度更大（24 - 46%），这归因于以下几点：DOM从反应活性较高的疏水性DOC（每毫克有机碳产生的微克三卤甲烷）转化为反应活性较低的亲水性DOC，以及臭氧化后疏水性和亲水性DOC的反应活性均降低。结果还表明酚羟基减少，这表明一些易被氯取代的反应位点（如间苯二酚或间二羟基苯环结构）被氧化，从而降低了有机碳形成三卤甲烷的反应活性。DOM的这些变化导致THMFP显著降低，而DOC的去除率无明显变化。
