Factors affecting THM, HAN and HNM formation during UV-chlor(am)ination of drinking water
| Autor: | Tian-Yang Zhang, Yi-Li Lin, Nai-Yun Gao, Zi-Bo Guo, Bin Xu, Chen-Yan Hu, Wenhai Chu, He Huang |
|---|---|
| Rok vydání: | 2016 |
| Předmět: |
Chemistry
General Chemical Engineering 0208 environmental biotechnology 02 engineering and technology General Chemistry 010501 environmental sciences 01 natural sciences Industrial and Manufacturing Engineering 020801 environmental engineering chemistry.chemical_compound Nitrate Bromide Environmental chemistry Medium pressure Environmental Chemistry Water treatment 0105 earth and related environmental sciences |
| Zdroj: | Chemical Engineering Journal. 306:1180-1188 |
| ISSN: | 1385-8947 |
| DOI: | 10.1016/j.cej.2016.08.051 |
| Popis: | This study investigated the effect of several factors on the formation of disinfection byproducts (DBPs) including trihalomethanes (THMs), haloacetonitriles (HANs) and halonitromethanes (HNMs) during UV-chlor(am)ination of the water collected after filtration unit in a drinking water treatment plant. In general, THM formation was higher during UV-chlorination while HAN and HNM formation were higher during UV-chloramination. Higher Medium pressure (MP) UV dose resulted in more DBP formation. The value of pH affected DBP formation differently. THMs decreased with increasing pH during UV-chlorination but remained stable during UV-chloramination. HNMs increased as pH increased from 5 to 7 but decreased as pH further increased to 9 during UV-chlorination. On the other hand, HNM formation decreased with increasing pH during UV-chloramination. However, pH had little impact on HAN formation. The nitrate concentration had negligible impact on the formation of THM, HAN and HNM during both UV-chlor(am)ination. Increasing bromide concentration improved THM and HAN formation, decreased HNM formation, and shifted DBPs to more brominated species in the three categories. MP UV irradiation enhanced the formation of DBPs compared to low pressure UV during both UV-chlor(am)ination, especially for nitrogenated DBPs. |
| Databáze: | OpenAIRE |
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