Environmental Engineering

Chemical degradation methods for wastes and pollutants : by Matthew A. Tarr

By Matthew A. Tarr

Chemical Degradation equipment for Wastes and toxins specializes in proven and rising chemical methods for the administration of pollution in commercial wastewater and the surroundings. This reference deals an in-depth rationalization of the degradation approach, mechanisms, and keep watch over elements affecting each one approach, in addition to matters the most important to the appliance of those methods in real-world remedy websites. It examines ten of the commonest and helpful chemical applied sciences for environmental remediation and sanitation of commercial waste streams and gives implementation directions and examples of remediation concepts which are the most important to powerful wastewater detoxification

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As stated previously, kinetic modeling allows predictions of the performance of any reacting system and represents an aid for process design (see Table 5). Kinetic modeling of O3/H2O2/UV systems has been studied extensively for the last decade with promising results especially for the oxidation of volatile organochlorine compounds [74–78]. For higher molecular weight compounds, with the exception of a few studies [79,81,129], the literature lacks information. This is probably because high molecular weight compounds, while reacting with ozone or hydroxyl radicals or being photolyzed, lead to intermediate compounds that also consume oxidants and/or UV radiation, thus making the kinetics very complex.

One possible disadvantage of static mixers is the pressure drop along the unit that limits the water flow rate applied. However, in some systems, such as those with sieve plates, the large freearea percentage, about 55%, allows a moderate pressure drop of 3000 to 7000 Pa with practically 100% ozone utilization [130]. The deep-U tube is constituted by two vertical concentric tubes approximately 20 m deep through which water and gas flow (inner tube) downwards and then upward through the outer tube.

All Rights Reserved. O3/UV/H2O2 Oxidation Technologies 45 ozonation alone with 20 L hrÀ1 gas flow rate). In order to overcome this problem, some studies carried out the ozonation homogeneously. Thus, Hayashi et al. [77] studied the O3, O3/UV (low-pressure mercury vapor lamp) oxidation of several VOCs (1,1,1 trichloroethane, trichloroethylene, and tetrachloroethylene) in a 30-mm-wide, 3-mm-thick, and 200-mm-high chamber where aqueous solutions of ozone and VOCs were fed and irradiated simultaneously.

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