Download PDF by Lawrence K. Wang, Yung-Tse Hung, Nazih K. Shammas: Advanced Physicochemical Treatment Technologies: Volume 5

By Lawrence K. Wang, Yung-Tse Hung, Nazih K. Shammas

ISBN-10: 1588298604

ISBN-13: 9781588298607

ISBN-10: 1597451738

ISBN-13: 9781597451734

In complicated Physiochemical remedy applied sciences, major pollutants keep an eye on educators and training execs describe how quite a few combos of alternative state of the art method platforms will be prepared to unravel air, noise, and thermal pollutants difficulties. each one bankruptcy discusses intimately the 3 simple types within which pollution and waste are manifested: gasoline, strong, and liquid. there's an intensive selection of layout examples and case histories.

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Additional info for Advanced Physicochemical Treatment Technologies: Volume 5 (Handbook of Environmental Engineering)

Sample text

Wang and Nazih K. 33 mole % Fig. 8. Cross-section view of principal elements of a corona discharge ozone generator (Source: US EPA). Figure 8 shows the principal elements of a corona discharge ozone generator (31,32). A pair of large-area electrodes is separated by a dielectric about 1–3 mm in thickness and an air discharge gap approx 3-mm wide. When an alternating current (AC) is applied across the discharge gap with voltages between 5 and 25 kV in the presence of an oxygencontaining gas, a portion of the oxygen is converted to ozone.

The pressurized gases include oxygen, ozone, and carbon dioxide. Under optimum operation, all gaseous ozone should disappear and the flotation process should release mainly oxygen and carbon dioxide. Because supplemental air is not needed in sludge flotation, a significant cost-savings in sludge thickening is achieved. The side streams from the flotation unit and belt press are recycled to the top of the treatment plant for reprocessing; these streams contain low concentrations of suspended solids and no harmful microorganisms.

For prevention of ozone decomposition, heat removal should be as efficient as possible. b. For dielectric material and electrode protection, the gap should be constructed so that the voltage can be kept relatively low, while maintaining reasonable operating pressures. 22 Lawrence K. Wang and Nazih K. 5 of ozone at 1% conc. c. For high-yield efficiency, a thin dielectric material with a high dielectric constant, such as glass, should be used. d. For prolonged generator life and reduced maintenance problems, high frequency AC should be used.

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Advanced Physicochemical Treatment Technologies: Volume 5 (Handbook of Environmental Engineering) by Lawrence K. Wang, Yung-Tse Hung, Nazih K. Shammas


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