Characterization of dissolved organic matter and disinfection characteristics of source water from the Pearl River

2007 ◽  
Vol 7 (2) ◽  
pp. 205-212
Author(s):  
Z.Y. Zhao ◽  
J.D. Gu ◽  
H.B. Li
Keyword(s):  
Organic Matter ◽  
Dissolved Organic Matter ◽  
Chlorine Dioxide ◽  
Anthropogenic Activities ◽  
Apparent Molecular Weight ◽  
Water Disinfection ◽  
Size Exclusion ◽  
Pearl River ◽  
Source Water ◽  
Raw Water

Source water samples were collected from Guangzhou segment of Pearl River and filtered through Amicon® YC-05, YM-1, YM-3, YM-10, YM-30, YM-100 and ZM-500 membranes sequentially after pre-treatment. The apparent molecular weights of the 8 fractions were calibrated using high-performance size exclusion chromatograph (HPSEC) and they ranged from 0.36 to 182.6 kDa. These fractionated isolates and the raw water were disinfected by chlorine or chlorine dioxide to determine their disinfection characteristics. Results showed that apparent molecular weight of the main dissolved organic matter (DOM) in the RO isolate of water sample was less than 360 Da and this part of the DOM was mainly from anthropogenic activities and contamination of wastewater. RO fraction was the controlling factor for the raw water disinfection process according to the THMs concentrations detected. Disinfection by chlorine dioxide produced less THMs that by chlorine.

Investigation of Dissolved Organic Matter after Oxidant Flushing of Simulated Raw Water Distribution System

2014 ◽  
Vol 700 ◽  
pp. 515-518
Author(s):  
Kun Xiang ◽  
Yan Ling Yang ◽  
Xing Li ◽  
Da Zhang
Keyword(s):  
Organic Matter ◽  
Organic Compound ◽  
Dissolved Organic Matter ◽  
Chlorine Dioxide ◽  
Distribution System ◽  
Water Distribution ◽  
Water Distribution System ◽  
Negative Impact ◽  
Raw Water ◽  
Negative Effect

Oxidant flushing of the raw water distribution system (RWDS) affects the degradation of dissolved organic matter (DOM). The characteristic of DOM after chlorine (NaOCl), chlorine dioxide (ClO2) and their combination (NaOCl/ClO2) were evaluated by dissolved organic compound (DOC), spectrophotometry and fluorescence of DOM in simulated RWDS. The results suggested that oxidant flushing had negative effect on DOC removal, especially for NaOCl/ClO2, but it was resumed with a higher recovery rate compared to ClO2 and NaOCl. The biodegradable of DOM increased after oxidant flushing, and related to DOC degradaion. Overall fluorescence of DOM intensity has a decrease potential after oxidant flushing, particularly for tryptophan-like fluorescence. These results indicated that NaOCl/ClO2 has less negative impact on the resume of DOM degradation in RWDS compared with corresponding single oxidant.

Characterization of dissolved organic matter from Australian and Chinese source waters by combined fractionation techniques

2011 ◽  
Vol 64 (1) ◽  
pp. 171-177 ◽  
Author(s):  
Qunshan Wei ◽  
Rolando Fabris ◽  
Christopher W. K. Chow ◽  
Changzhou Yan ◽  
Dongsheng Wang ◽  
...  
Keyword(s):  
Organic Matter ◽  
Dissolved Organic Matter ◽  
High Performance ◽  
Size Exclusion ◽  
Rapid Urbanization ◽  
Molecular Weights ◽  
Treatment Processes ◽  
Exclusion Chromatography ◽  
Urbanization In China ◽  
Source Waters

The character of dissolved organic matter (DOM) in source waters from two countries (Australia and China) was investigated using an extended fractionation technique by combining resin adsorption, ultrafiltration and high performance size exclusion chromatography. There are distinctive chemical characteristics associated with DOM origins. Australian sourced DOM had higher hydrophobic acid (HoA) content and exhibited a more pronounced humic character, indicating a higher influence from allochthonous organics (decayed plant bodies from vegetated catchments). The higher content of hydrophobic base and neutral components found in Chinese DOM, may be attributed to the effects of increasing pollution caused by the rapid urbanization in China. The molecular weights (MWs) of aquatic HoA are predominantly in the moderate (e.g. 1–10 kDa) or small (e.g. <1 kDa) ranges. This suggests that aquatic HoA should not be assumed as high MW organics without experimental validation. It is also found that some of the low MW compounds in our samples were hydrophobic, which could explain the observation of low MW organic compounds being able to be removed by conventional treatment processes.

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