Özdemır Kadir
Department of Environmental Engineering, Bülent Ecevit University, Incivez, 67100 Zonguldak, Turkey.
ScientificWorldJournal. 2014 Jan 16;2014:703173. doi: 10.1155/2014/703173. eCollection 2014.
This study investigates the fractions of natural organic matter (NOM) and trihalomethane (THM) formation after chlorination in samples of raw water and the outputs from ozonation, coagulation-flocculation, and conventional filtration treatment units. All the water samples are passed through various ultrafiltration (UF) membranes. UF membranes with different molecular size ranges based on apparent molecular weight (AMW), such as 1000, 3000, 10,000, and 30,000 Daltons (Da), are commonly used. The NOM fraction with AMW<1000 Da (1 K) is the dominant fraction within all the fractionated water samples. Its maximum percentage is 85.86% after the filtration process and the minimum percentage is 65.01% in raw water samples. The total THM (TTHM) yield coefficients range from 22.5 to 42 μg-TTHM/mg-DOC in all fractionated samples, which is related to their specific ultraviolet Absorbance (SUVA) levels. As the molecular weight of the fractions decreased, the TTHM yield coefficients increased. The NOM fractions with AMW values less than 1 K had lower SUVA values (<3 L/mg·m) for all treatment stages and also they had higher yield of TTHM per unit of DOC. The NOM fraction with AMW<1 K for chlorinated raw water samples has the highest yield coefficient (42 μg-TTHM/mg-DOC).
本研究调查了原水以及臭氧化、混凝絮凝和常规过滤处理单元出水样本中天然有机物（NOM）的组分以及氯化后三卤甲烷（THM）的生成情况。所有水样都通过了各种超滤（UF）膜。通常使用基于表观分子量（AMW）的不同分子尺寸范围的超滤膜，例如1000、3000、10000和30000道尔顿（Da）。在所有分级水样中，AMW<1000 Da（1K）的NOM组分是主要组分。过滤后其最大百分比为85.86%，原水样本中的最小百分比为65.01%。在所有分级样本中，总三卤甲烷（TTHM）产率系数范围为22.5至42 μg-TTHM/mg-DOC，这与其特定紫外吸光度（SUVA）水平有关。随着组分分子量的降低，TTHM产率系数增加。对于所有处理阶段，AMW值小于1K的NOM组分具有较低的SUVA值（<3 L/mg·m），并且它们每单位DOC的TTHM产率更高。氯化原水样本中AMW<1K的NOM组分具有最高的产率系数（42 μg-TTHM/mg-DOC）。
