Occurrence and Sources of Disinfection Byproducts (DBPs) Precursors in Watersheds
Date Issued
2014
Date
2014
Author(s)
Chen, Yu-Ting
Abstract
Disinfection byproducts (DBPs) are groups of chemicals formed from reactions between disinfectants and natural organic matters (NOM). Several categories of DBPs have been regulated due to their potential connections with bladder cancer and reproductive effects. Among different categories of DBPs, trihalomethanes (THMs), haloacetic acids (HAAs), haloacetonitriles (HANs), and nitrosamines are four major groups of known DBPs frequently detected in drinking water, while 70% of DBPs still remain unknown. Regarded as the primary precursors of DBP formations, NOM is a combination of dissolved and particulate organics originated from plants and animals. Its sources can be discovered in five different ways: fallen leaves, rainfall, littoral zones, wetlands and water body. Despite the fact that controls of DBPs in drinking water can be achieved with alternative technologies, among which reduction of DBP precursors from raw water is the most effective way.
Since the NOM and anthropogenic pollution in watersheds have been shown to be the major sources of DBP precursors in several studies, this study attempts to correlate the land use and DBPs precursors in three Taiwanese watersheds (Taipei, Keelung and Kinmen) to assess the sources of the DBP precursors. Water samples from the three watersheds were collected and corresponding water quality characteristics were analyzed. Combined with land use information in watersheds, the results were used to elucidate the correlations between the watershed land use, the source water qualities, and the following DBPs formation after chlorination.
The results showed that Taipei watershed has the lowest NOM level because of the best watershed management, the highest concentration of nitrogen organic matter occurred in Keelung watershed, while the Kinmen watershed had the highest carbon organic matter level. ArcGIS was used to access the land use proportions in the three watersheds, the results demonstrated that the anthropogenic land uses may cause the raise of the dissolved organic matter in Keelung watershed, while the high natural organic matters in Kinmen watershed resulted from the agriculture activities. It is recommended that more monitoring activities should be done to verify the relationships between land use and source water qualities.
Subjects
集水區
土地使用
消毒副產物
地理資訊系統
天然有機物
Type
thesis
File(s)![Thumbnail Image]()
Loading...
Name
ntu-103-R01844001-1.pdf
Size
23.32 KB
Format
Adobe PDF
Checksum
(MD5):412bbccfb0624442275f91d6d8ae76b3