title: Measurement of dissolved organic nitrogen in a drinking water treatment plant: size fraction, fate, and relation to water quality parameters.
abstract: This paper investigates the characteristics of dissolved organic nitrogen (DON) in raw water from the Huangpu River and also in water undergoing treatment in the full-scale Yangshupu drinking water treatment plant (YDWTP) in Shanghai, China. The average DON concentration of the raw water was 0.34 mg/L, which comprised a relatively small portion (~5%) of the mass of total dissolved nitrogen (TDN). The molecular weight (MW) distribution of dissolved organic matter (DOM) was divided into five groups: >30, 10-30, 3-10, 1-3 and <1 kDa using a series of ultrafiltration membranes. Dissolved organic carbon (DOC), UV absorbance at wavelength of 254 nm (UV254) and DON of each MW fraction were analyzed. DON showed a similar fraction distribution as DOC and UV254. The <1 kDa fraction dominated the composition of DON, DOC and UV254 as well as the major N-nitrosodimethylamine formation potential (NDMAFP) in the raw water. However, this DON fraction cannot be effectively removed in the treatment line at the YDWTP including pre-ozonation, clarification and sand filtration processes. The results from linear regression analysis showed that DON is moderately correlated to DOC, UV254 and trihalomethane formation potential (FP), and strongly correlated to haloacetic acids FP and NDMAFP. Therefore, DON could serve as a surrogate parameter to evaluate the reactivity of DOM and disinfection by-products FP.
authors.affiliation: State Key Laboratory of Pollution Control and Resources Reuse, Ministry of Education, College of Environmental Science and Engineering, Tongji University, Shanghai 200092, PR China.
authors.forename: Bin
authors.initials: B
authors.lastname: Xu
authors.forename: Tao
authors.initials: T
authors.lastname: Ye
authors.forename: Da-Peng
authors.initials: DP
authors.lastname: Li
authors.forename: Chen-Yan
authors.initials: CY
authors.lastname: Hu
authors.forename: Yi-Li
authors.initials: YL
authors.lastname: Lin
authors.forename: Sheng-Ji
authors.initials: SJ
authors.lastname: Xia
authors.forename: Fu-Xiang
authors.initials: FX
authors.lastname: Tian
authors.forename: Nai-Yun
authors.initials: NY
authors.lastname: Gao
mesh_terms: D004784:Environmental Monitoring; D009584:Nitrogen / Q000032:analysis*; D009930:Organic Chemicals / Q000032:analysis*; D045483:Rivers / Q000737:chemistry*; D014874:Water Pollutants, Chemical / Q000032:analysis*; D014877:Water Pollution, Chemical / Q000706:statistics & numerical data; D018508:Water Purification; D014881:Water Supply / Q000032:analysis*
chemical_list: D009930:Organic Chemicals; D014874:Water Pollutants, Chemical; D009584:Nitrogen