Pilot study on bromate reduction in ozonation of water with low carbonatealkalinities by carbon dioxide |
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Authors: | Ji Li Li Zou Lulu Guo Jialin Ji |
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Affiliation: | Harbin Institute of Technology Shenzhen Graduate School, Shenzhen 518055, China |
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Abstract: | A pilot study was carried out to explore the application of carbon dioxide for pH depression in a bubble column and its ability to inhibit bromate formation for water with a low alkalinity. Results showed that in the absence of ammonia, CO2 was capable of reducing bromate 38.0%–65.4% with one-unit pH depression. CO2 caused a slightly lower bromate reduction (4.2%) than did H2SO4 when the pH was depressed to 7.4, and a more a pronounced lower reduction (8.8%) when the pH was depressed to 6.9. In the presence of 0.20 mg/L-N ammonia, bromate was largely inhibited with 73.9% reduction. When the pH was depressed to 7.4, CO2 and H2SO4 showed an 11.3% and 23.5% bromate reduction respectively, demonstrating that the joint use of CO2 and ammonia might be a plausible strategy of blocking all three bromate formation pathways. CO2 could be applied through the aeration diifuser together with ozone gas, resulting in a similar bromate reduction compared with the premixing method through Venturi mixer. |
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Keywords: | ozone bromate carbon dioxide |
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