Download 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

In complex Physiochemical remedy applied sciences, prime pollutants regulate educators and working towards execs describe how numerous mixtures of alternative state of the art technique platforms will be prepared to resolve air, noise, and thermal pollutants difficulties. every one bankruptcy discusses intimately the 3 uncomplicated kinds within which pollution and waste are manifested: gasoline, stable, and liquid. there's an in depth choice of layout examples and case histories.

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Under an influent water pressure of 30 psi, FLPC-treated water is discharged under gravity with a subsequent retention period of 2–4 min in the tank. c. Turbine contactor for wastewater treatment (Fig. 12). The turbine contactor is used for wastewater treatment, where the ozone contact time has to be extended. Mass transfer of 10–12 lb of oxygen per horsepower as compared with 2–3 lb with an average aerator. At this stage ozone transfer of 99–100% can be achieved. For efficient wastewater treatment depending on the effluent contamination and the flow, one to four turbines may be used in 26 Lawrence K.

2. Ozone Reaction with Organic Material The exact mechanism for the chemical processes taking place when water or wastewater is subjected to treatment by ozone and oxygen is still under investigation. In general, part of ozone in the reactor oxidizes carbonaceous substances in water or wastewater, thus producing carbon dioxide and oxygen, as shown in Eq. (43): 2O3 + C (organic) o CO 2 + 2O 2 (43) Pressurized Ozonation 39 Fig. 15. Ozone reactions with organics Eqs. (44)–(47) (68). The previous reaction is an oxidation reaction, and the carbon dioxide and oxygen are oxidation products.

C. Ozone can break down organometallic complexes of both iron and manganese, which usually defy the conventional oxidation processes for iron and manganese removal from potable water. d. Ozone readily oxidizes sulfides and sulfites to stable sulfates and nitrites to stable nitrates. e. Bromides and chlorides can be oxidized by ozone to bromine and chlorine, respectively, although these reactions are slow and dependent on the concentration of reactants. d. The oxidation of iodides to iodine is the basis for the standard method used in the determination of ozone concentration (64).

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