Study on the production of chlorine dioxide by membrane electrolysis method
| Autor: | Chia-Lin Yang, 楊佳霖 |
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| Rok vydání: | 2010 |
| Druh dokumentu: | 學位論文 ; thesis |
| Popis: | 98 Chlorine dioxide (ClO2) is potentially a powerful disinfectant for water treatment. It is widely used in public water system to treat potable water since it provides less disinfection by-products than chlorine. Today there are no guideline and analysis method for ClO2 in Taiwan yet. In the future, the ClO2 will be more and more widely used as a disinfectant for potable water, food, medicine, environment and so forth. Many researches relating manufacture and application have been studied in the world. Although increased attention has been paid for on-line chlorine dioxide generation by several chemical and electrochemical methods, the details are mostly confined as patents. Lately, the novel electrochemistry technology for ClO2 production has the advantage of high purity, simple dosing and continuous operating on-site. Furthermore, many increasing interests of wastewaters are treated by electrochemistry. This study is focused on the effect of different electrolyte on ClO2 production. The results were obtained in the electrolysis operation process. It was found the dissolved gas ClO2 produced in the solution was increased, when the cell voltage continuously increased with increasing in the current and temperature. When the NaOH concentration was increased, the ClO2 produced in the solution was fast. The optimum concentration is NaOH 0.5%. As can be observed, electrochemically generated ClO2 concentration increased gradually with a tendency for saturation, when NaCl concentration in the bulk solution was increase. The optimum concentration is NaCl 10%. Moreover, when producing the ClO2 solution with a Venturi injector in the mixed anolyte of NaCl and sodium chlorite(NaClO2), the concentration and the purity of ClO2 were proportional to the initial NaClO2 concentration in the anolyte. It indicated that the maximum concentration and purity of ClO2 solution achieved 302.01 mg/L and 91 %, respectively, in the mixed anolyte of 2 % NaCl and 6 % NaClO2.It was also observed the feed solution was acidic condition and the ClO2 production was ahead of time. It can be concluded that a great removal in sanitary sewage treatment and a maximum production of ClO2 could be achieved by the electrochemistry technology. |
| Databáze: | Networked Digital Library of Theses & Dissertations |
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