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

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, top pollutants keep an eye on educators and training execs describe how a number of combos of alternative state of the art technique platforms might be prepared to unravel air, noise, and thermal toxins difficulties. every one bankruptcy discusses intimately the 3 simple types during which toxins and waste are manifested: fuel, sturdy, and liquid. there's an intensive choice of layout examples and case histories.

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

Sample text

In addition to the generator’s ozone yield per unit area of electrode surface, the concentration of ozone from the generator is regulated by: a. Adjusting the flow rate of feed gas, b. Adjusting the voltage across the electrodes, and/or c. Selecting a suitable feed gas. For economic reasons, it is advisable to feed oxygen or oxygen-enriched air (instead of ordinary air) to the ozone generators. However, for an electronic ozone generator using the latest semiconductors for power generation and titanium oxide ceramic electrodes for ozone generation, feeding ordinary air is common.

The activity of such catalysts depends on subdivision, crystal structure, presence or absence of moisture, and so on. Preparations of iron oxide have been made that are extremely active in decomposing ozone. In aqueous solutions, the decomposition of ozone is much more rapid than in the gaseous state. It is catalyzed by the hydroxyl ion. The initial reaction is shown in Eq. (16): O3 + OH  o O 2 + [HO 2 ] (16) followed by the reactions shown in Eqs. (17)–(20). O3 + [HO 2 ] o 2O 2 + OH  (17) O3 + OH  o O 2 + [HO 2 ] (18) 2[HO 2 ] o O3 + H 2 O (19) [HO 2 ] + [HO] o O 2 + H 2 O (20) Ozone is more soluble in water than is oxygen, but because of a much lower available partial pressure, it is difficult to obtain a concentration of more than a few milligrams per liter under normal conditions of temperature and pressure.

34): O3 + NO 2 o NO3 + O 2 (33) (34) Pressurized Ozonation 37 This reaction has been used for the quantitative determination of ozone. Ozone reacts rapidly with hydrogen sulfide (H2S). In dry gas mixtures the only reaction product appears to be sulfur dioxide (SO2), but the amount of ozone consumed per mole of H2S has not yet been established with certainity. The reaction in water solution has not been adequately studied but there are reports that colloidal sulfur is among the products. In the gas phase, ozone and SO2 react slowly.

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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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