Characterization of algal organic matter and formation of DBPs from chlor(am)ination
Characterization of algal organic matter and formation of DBPs from chlor(am)ination
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DOI：
10.1016/j.watres.2010.07.009
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发表时间：
2010-12-01
期刊：
影响因子：
12.8
通讯作者：
Zhao, Quan
中科院分区：
文献类型：
--
作者：
Fang, Jingyun;Yang, Xin;Zhao, Quan
饮用水水库藻类水华的频繁发生给供水带来了问题，其中之一就是高浓度藻类有机物的释放影响饮用水水质。对藻类有机质进行了表征，包括胞外有机物(EOM)和胞内有机物(IOM)。评价了EOM、IOM和藻细胞氯化和氯胺化过程中各种消毒副产物(DBP)的形成情况。从苏万尼河中分离出的天然有机物(NOM)也进行了比较。EOM和IOM中有机氮含量丰富，主要由高(10 kDa以上)和低(70-1000 Da)分子量有机质组成，有机碳相对分子质量较低。与EOM相比，IOM具有更高的总有机氮比例，更高的相对分子质量和更多的疏水含量。与EOM相比，IOM含有更多的游离氨基酸，但脂肪胺的含量更低。在EOM和IOM的氯化过程中，首先形成有机氯胺，然后在1d后检测不到。与NOM的氯化相比，EOM和IOM氯化产生更多的N-DBPs(N-DBPs)和卤醛，而更少的碳质DBPs(C-DBPs)。EOM和IOM经3-d氯胺化后，均有有机氯胺生成。EOM和IOM氯胺化生成的N-DBP和C-DBP的量远低于NOM。在氯化和氯胺化作用中，EOM产生的DBPs(三氯硝基甲烷除外)比IOM和藻细胞产生的少。(C)2010年由爱思唯尔有限公司出版。
The frequent occurrence of algal blooms in drinking water reservoirs causes problems to water supply, one of which is the release of algal organic matter in high concentrations to affect drinking water quality. Algal organic matter, including extracellular organic matter (EOM) and intracellular organic matter (IOM), was characterized. The formation of a variety of disinfection by-products (DBPs) in chlorination and chloramination of EOM, IOM and algal cells was evaluated. Natural organic matter (NOM) isolated from Suwannee River was also studied for comparison. EOM and IOM were rich in organic nitrogen, which consisted of high (over 10 kDa) and low (70-1000 Da) molecular weight (MW) organic matter, whilst the MW of organic carbon in EOM and IOM was relatively lower. IOM had a higher fraction of total organic nitrogen, with larger proportions of higher MW and more hydrophobic contents than did EOM. IOM also contained higher fractions of free amino acids but lower fractions of aliphatic amines than did EOM. During chlorination of EOM and IOM, organic chloramines were first formed and then became undetectable after 1 d. Chlorination of EOM and IOM produced more nitrogenous DBPs (N-DBPs) and haloaldehydes and less carbonaceous DBPs (C-DBPs) than did chlorination of NOM. Organic chloramines were found after 3-d chloramination of EOM and IOM. The amounts of N-DBPs and C-DBPs formed from chloramination of EOM or IOM were much less than that from NOM. EOM produced less DBPs (except for trichloronitromethane) than did IOM and algal cells in chlorination and chloramination. (C) 2010 Published by Elsevier Ltd.