Environmental Science
3 years ago

UV/chlorine system accelerates water toxin removal but increases harmful byproducts.

Separation and Purification Technology
Comparison of UV and UV/chlorine system on degradation of 2,4-diaminobutyric acid and formation of disinfection byproducts in subsequent chlorination
Jiamin Huang, Yu‐Wei Wu, Yangtao Wu, Da Sheng, Julong Sun, Lingjun Bu, Shiqing Zhou

Paper Summary

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The study compared the effectiveness of UV and UV/chlorine systems in removing a harmful amino acid called 2,4-diaminobutyric acid (DAB) from water. The researchers found that the UV/chlorine system degraded DAB more efficiently but also produced more disinfection byproducts (DBPs). The formation of DBPs varied based on factors like UV exposure time, pH, and chlorine concentration. Carbonaceous DBP precursors were mainly formed during UV irradiation, while nitrogenous DBP precursors were mainly formed in the UV/chlorine system. When bromide was present, brominated DBPs were the most common, and their levels increased with higher bromide concentrations. Overall, the study highlights the importance of considering DBP formation when choosing between UV and UV/chlorine systems to remove DAB from water.