Variation of carbonaceous disinfectants by-products precursors and their correlation with molecular characteristics of dissolved organic matter and microbial communities in a raw water distribution system

Chemosphere ◽  
2021 ◽  
pp. 131180
Author(s):  
Yueting Wang ◽  
Hang Xu ◽  
Zhen Shen ◽  
Chenwei Liu ◽  
Mingmei Ding ◽  
...  
Keyword(s):  
Organic Matter ◽  
Dissolved Organic Matter ◽  
Microbial Communities ◽  
Distribution System ◽  
Water Distribution ◽  
Water Distribution System ◽  
Molecular Characteristics ◽  
Raw Water ◽  
By Products

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.

Variations of DBPs precursors according to location within the distribution system

2009 ◽  
Vol 9 (4) ◽  
pp. 413-421
Author(s):  
C. Beaulieu ◽  
M. J. Rodriguez ◽  
J.-B. Sérodes
Keyword(s):  
Organic Matter ◽  
Water Treatment ◽  
Distribution System ◽  
Water Distribution ◽  
Water Distribution System ◽  
Spatial Behavior ◽  
Haloacetic Acids ◽  
Formation Potential ◽  
The Impact ◽  
By Products

Little information is available on the evolution of remaining organic matter (ROM) in a water distribution system (WDS) and its impact on the generation of disinfection by-products (DBPs). This research involves the characterization, through sample fractionation processes and experimental chlorination tests, of the reactivity of DBP precursors occurring within a WDS. The study is based on samples collected in various locations of a WDS during a complete year. For each sample, six fractions were generated to determine their potential for formation of trihalomethanes (THMs) and haloacetic acids (HAAs). Fractionation processes on ROM demonstrated that the spatial behavior of precursors for THMs differs from that for precursors of HAAs. In addition, experimental chlorination tests showed that the reactivity of the investigated fractions, in terms of DBP formation potential (DBPfp), was different from each other according to location in the WDS. DBPfp for the studied fractions changed drastically during water treatment. However, changes of DBPfp for fractions were relatively low between the beginning and the extremity of the distribution system. Since the results of this research confirm that the ability to produce DBPs is related to the nature of the fractions, they could be useful to evaluate the impact of re-chlorination on DBP formation in a WDS.

Natural Organic Matter and Disinfectant By-Products (DBPs) Formation Potential in Agriculture Area in Malaysia

2015 ◽  
Vol 802 ◽  
pp. 513-518
Author(s):  
Nurazim Ibrahim ◽  
Hamidi Abdul Aziz ◽  
Mohd Suffian Yusoff
Keyword(s):  
Organic Matter ◽  
Water Treatment ◽  
Natural Organic Matter ◽  
Distribution System ◽  
Water Distribution ◽  
Water Distribution System ◽  
Treatment Plant ◽  
Water Treatment Plant ◽  
Treatment Processes ◽  
By Products

Natural organic matter (NOM) in water reacts with chlorine or other disinfectants and form hazardous disinfectant by-products (DBPs). This study aimed to detect the presence of NOM in a conventional water distribution system using UV absorbance at 254 nm as a surrogate. Two water treatment plants were selected, namely, Jalan Baharu Water Treatment Plant (JBWTP) and Lubok Buntar Water Treatment Plant (LBWTP). Aside from determining the amount of NOM, the reduction of UV254after completing the series of treatments (coagulation, flocculation, sedimentation, filtration, and disinfection) was also observed. The presence of UV254in both raw water and treated water samples confirmed the presence of NOM. The concentration of UV254recorded at JBWTP and LBWTP were 0.14 and 0.13 cm−1, respectively. After the treatment processes, the concentration was reduced to 0.04 cm−1for JBWTP and 0.03 cm−1for LBWTP. These results indicated that the water supply in both plants contains DBP precursors and implied the possibility of DBP formation in the system. Moreover, the percentage reduction of UV254recorded were 69% and 75% for JBWTP and LBWTP, respectively.

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