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

By Matthew A. Tarr

Textual content specializes in confirmed and rising chemical approaches for the administration of toxins in commercial wastewater and the surroundings. bargains an in-depth clarification of the degradation technique, mechanisms, and keep an eye on elements affecting every one technique. comprises greater than 1,100 present references.

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However, the case of carbonate ion is rather special because it reacts with hydroxyl radicals to yield the carbonate ion radical: k¼3:7Â108 MÀ1 sÀ1 À À  CO¼ 3 þ HO ! CO3 þ OH k¼2Â10 M 7 À1 À1 s À  HCOÀ 3 þ HO ! CO3 þ H2 O ð68Þ ð69Þ which is also known to react with organic compounds in water. Table 8 presents a list of rate constants of these reactions. In addition, the carbonate ion radical also reacts with hydrogen peroxide, if present in water, to regenerate the carbonate ion and the hydroperoxide ion radical that eventually leads to the hydroxyl radical in the presence of ozone.

As observed in Table 10, the literature reports a large amount of information on the chemical oxidation of phenols. Subcritical oxidations such as those involving ozone, hydrogen peroxide and/or UV radiation, Fenton reagent, or wet air oxidation have been applied. In general, phenols can be photolyzed with UV radiation and react very fast with both ozone and hydroxyl radicals. The latter reactions are favored by the presence of the hydroxyl group, which activates the aromatic ring for electrophilic substitution reactions.

1 Ag LÀ1 for the European Environmental Commission according to Directive 80/778/ EEC). In some countries atrazine cannot be used but it is still found in many surface waters. In France, for example, atrazine was banned on September 28, 2001. From applied technologies, only carbon adsorption [180] and possibly advanced oxidations can be recommended to remove some of these TM Copyright © 2003 by Marcel Dekker, Inc. All Rights Reserved. O3/UV/H2O2 Oxidation Technologies 43 herbicides from water. Notice that oxidation of some herbicides could lead to unknown by-products that are difficult to remove, even with activated carbon adsorption.

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