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[Bromate ions formation in UV/chlorination processes for bromide-containing solutions].
Xin Huang1, Nai-Yun Gao, Jian-Fu Zhao
1State Key Laboratory of Pollution Control and Resource Reuse, Tongji University, Shanghai 200092, China.
UV/chlorination processes can oxidize bromide to bromate, a disinfection byproduct. Factors like pH, temperature, and UV intensity influence bromate formation, which is linked to chlorine decomposition.
Area of Science:
- Environmental Chemistry
- Water Treatment Technologies
- Photochemistry
Context:
- Disinfection byproducts (DBPs) are a concern in water treatment.
- UV/chlorination is a common water disinfection method.
- Bromate is a potentially carcinogenic DBP formed during water treatment.
Purpose:
- To investigate bromate ion formation during UV/chlorination processes.
- To explore the influence of experimental conditions on bromate formation.
- To understand the relationship between chlorine decomposition and bromate production.
Summary:
- Bromate formation was studied under varying pH, NaOCl concentration, dissolved oxygen, UV intensity, and temperature.
- In UV/chlorination, bromide is oxidized to bromate (6.6-32%), unlike in dark conditions.
- Chlorine decomposition followed pseudo-first order kinetics, linearly related to temperature and UV intensity.
- Bromate formation occurred in three stages and was favored by low pH, low dissolved oxygen, and high chlorine concentration.
- Increased temperature and UV intensity accelerated chlorine decomposition and bromate formation.
Impact:
- Provides insights into optimizing UV/chlorination processes to minimize bromate formation.
- Contributes to understanding the chemical mechanisms of bromate generation.
- Informs water quality management and risk assessment related to DBPs.
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