Characterization of DON in IOM derived from M. aeruginosa and its removal by sunlight/immobilized TiO2system

RSC Advances ◽  
2015 ◽  
Vol 5 (51) ◽  
pp. 41203-41209 ◽  
Author(s):  
Cheng Liu ◽  
Jie Wang ◽  
Wei Chen ◽  
Haoqiang Zhu ◽  
Hongkai Bi
Keyword(s):  
Dissolved Organic Nitrogen ◽  
Organic Nitrogen ◽  
Water Sources ◽  
Disinfection Byproducts ◽  
Eutrophic Water

Dissolved organic nitrogen (DON) is now considered as one of the most important precursors of nitrogenous disinfection byproducts (N-DBPs), and the algae cells were the main source of DON in eutrophic water sources.

Effect of pre-ozonation on N-nitrosodimethylamine (NDMA) formation from four drinking-water sources during subsequent chloramination

2019 ◽  
Vol 19 (6) ◽  
pp. 1816-1822
Author(s):  
X. B. Liao ◽  
L. Zhao ◽  
L. L. Shen ◽  
M. Y. Chen ◽  
C. Chen ◽  
...  
Keyword(s):  
Drinking Water ◽  
Dissolved Organic Nitrogen ◽  
Organic Nitrogen ◽  
Ammonia Concentration ◽  
Quality Parameters ◽  
Water Sources ◽  
Ultraviolet Absorbance ◽  
Drinking Water Sources ◽  
The World ◽  
Doc Concentration

Abstract Ozone has been widely used for water treatment all over the world. This study investigated the effects of pre-ozonation on N-nitrosodimethylamine (NDMA) formation from four drinking-water sources during subsequent chloramination. Moreover, relationships between NDMA and water-quality parameters (dissolved organic carbon (DOC), dissolved organic nitrogen (DON), hydrophobic fractions (HFs), positive-charged fractions (PCFs), ultraviolet absorbance at 254 nm wavelength (UV254), ammonia) were determined. The results indicated that NDMA formed directly by ozonation, but the concentrations (5.7–37.8 ng/L) were much lower than during chloramination (25.3–193 ng/L). Pre-ozonation slightly augmented NDMA formation from reservoirs, while it facilitated NDMA precursor destruction in the lake and river. The river was rich in organic matter, its DOC concentration was up to 4.97 mg/L, while the DON/DOC ratio (4.68%) was low; the lake possessed the most organic nitrogen and highest DON/DOC ratio (10.76%). HFs in reservoir #2 were low (1.27 mg/L), and the HFs/DOC ratio was especially high (73.4%). PCFs constituted 48.5–72.1% of DOC. UV254 values were in the range 0.081–0.175 cm−1. The ammonia concentration was high in the lake water (0.29 mg/L), while that in reservoir #2 was only 0.08 mg/L. There was a strong correlation between NDMA formation and the removal of ammonia, DON and PCFs.

scholarly journals Characteristics of Dissolved Organic Nitrogen in the Sediments of Six Water Sources in Taihu Lake, China

2019 ◽  
Vol 16 (6) ◽  
pp. 929 ◽  
Author(s):  
Xiaofan Yang ◽  
Xueyu Wei ◽  
Xiaoping Xu ◽  
Yu Zhang ◽  
Jincheng Li ◽  
...  
Keyword(s):  
Molecular Weight ◽  
Drinking Water ◽  
Dissolved Organic Nitrogen ◽  
Organic Nitrogen ◽  
Taihu Lake ◽  
Water Sources ◽  
Dissolved Nitrogen ◽  
Total Dissolved Nitrogen ◽  
Endogenous Release ◽  
Molecular Weight Fractions

KCl-extractable sediment dissolved organic nitrogen (KS-DON) extracted from sediments near drinking water intakes of six drinking water sources in Taihu Lake in China was partitioned into hydrophobic and hydrophilic fractions and high/low molecular weight fractions. The results showed that the total dissolved nitrogen (TDN) contents of the extracts ranged from 67.78 to 128.27 mg/kg. KS-DON was the main TDN species, accounting for more than 50%, with NH4+-N and NO3−-N averaging 30% and 20%, respectively. The molecular weight fractions of <1 kDa accounted for almost half of KS-DON. Hydrophilic compounds accounted for more than 75% of KS-DON. Three fluorescence peaks were identified: soluble microbial byproducts (A); protein-like substances (B); and humic acid-like substances (C). It is concluded that the KS-DON in Taihu Lake sources has higher bioavailability and higher risk of endogenous release. Ecological dredging and establishment of constructed wetlands are possible measures to reduce the release of endogenous nitrogen.

Characterization of dissolved organic nitrogen in wet deposition from Lake Erhai basin by using ultrahigh resolution FT-ICR mass spectrometry

Chemosphere ◽  
2016 ◽  
Vol 156 ◽  
pp. 438-445 ◽  
Author(s):  
Shuang Feng ◽  
Li Zhang ◽  
Shengrui Wang ◽  
Alexey B. Nadykto ◽  
Yisheng Xu ◽  
...  
Keyword(s):  
Mass Spectrometry ◽  
Wet Deposition ◽  
Dissolved Organic Nitrogen ◽  
Organic Nitrogen ◽  
Ultrahigh Resolution ◽  
Lake Erhai ◽  
Ft Icr
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