Mechanism of Pre-ozonation Enhanced Coagulation on DON in the Secondary Effluent

Municipal wastewater effluent is increasingly used as reclaimed water and source water for downstream areas. Scholars are beginning to study the potential of dissolved organic nitrogen (DON) as a precursor to the formation of nitrogen disinfection by-products (DBP). In order to explore the mechanism...

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Bibliographic Details
Published inHuanjing kexue Vol. 38; no. 12; p. 5106
Main Authors Liu, Bing, Zheng, Yu-Ming, Wang, Da-Xiang, Li, Qing-Fei, Zhao, Cheng-Mei, Yu, Guo-Zhong, Gu, Li
Format Journal Article
LanguageChinese
Published China 08.12.2017
Subjects
Disinfection
Nitrogen - isolation & purification
Ozone - chemistry
Waste Water
Water Pollutants, Chemical - isolation & purification
Water Purification
secondary effluent
3DEEM
pre-ozonation
dissolved organic nitrogen(DON)
disinfection by-products(DBPs)
enhanced coagulation
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Summary:Municipal wastewater effluent is increasingly used as reclaimed water and source water for downstream areas. Scholars are beginning to study the potential of dissolved organic nitrogen (DON) as a precursor to the formation of nitrogen disinfection by-products (DBP). In order to explore the mechanism of pre-ozonation coupled with enhanced coagulation on DON in the secondary effluent, the distributions of molecular weight and hydrophobicity/hydrophilicity of DON were analyzed. Disinfection by-product formation potential from chlorination was also investigated. Lastly, the composition and chemical structure of DON before and after coagulation were studied in combination with 3DEEM. Our results showed that pre-ozonation followed by coagulation with PACl significantly enhanced the removal of DON and mitigated DBP formation potentials. The following conclusions can be drawn from this study:① The tested effluent was very hard as indicated by total hardness and high calcium concentrations, and the pH had an important
ISSN:0250-3301
DOI:10.13227/j.hjkx.201705142