Chemical Processes

Among the chemical processes applied for landfill leachate treatment, advanced oxidation processes play a key role. Their effectiveness results from an increased oxidation rate arising from hydroxyl radicals OH\ These free radicals are generated from added oxidants and are characterized by high reactivity, low selectivity towards organic compounds and high oxidation potential (E°=2.80 V) [57]. Generally, advanced oxidation processes may be divided into two groups: chemical oxidation (without photolysis) and photochemical (enhanced by photolysis).

Within the first group are the following processes (Fig. 11):

• ozone oxidation at high pH;

• oxidation with Fenton reagent.

In the second group, the processes used for leachate treatment are as follows (Fig. 11):

• ozone oxidation combined with UV light;

• H2O2 oxidation combined with UV light;

• oxidation with Fenton reagent combined with UV light: Photo-Fenton reaction;

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