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The main objective of this research was to investigate the
capabilities of three chemical oxidation processes as pretreatment
technologies with the goal of making wastewaters containing
persistent organic compounds amenable to biotreatment. The
processes investigated are ozonation, ultraviolet radiation/
hydrogen peroxide (UV/H2O2) and Fenton reaction. The studies were
focused on two organic compounds: Dichloro diethyl ether (DCDE) and
methyl tertiary butyl ether (MTBE). Synthetic solutions, and a real
groundwater and an industrial wastewater were used for
experimentation. The experimental method involved oxidation of
solutions of the target organic compounds at various percentages by
the three oxidation processes. The pre-oxidized solutions of the
organic compounds were subjected to biodegradation and toxicity
studies. Four different respirometric tests (two Short-term, one
Mid-term, and one Long-term) and a bench scale Sequencing Batch
Reactor (SBR) test were used for full assessment of the
effectiveness of the chemical oxidation processes. Activated
sludge, as acclimated and non-acclimated to the organic compounds,
was used as the test culture. All three chemical oxidation
processes were able to transform DCDE and MTBE to a variety of
oxidation by-products. Oxidation by-products by all three oxidation
methods were significantly more biodegradable than the non-oxidized
parent compounds. This project clearly showed that integration of
chemical oxidation processes with biotreatment may lead to
effective handling of "problem" wastewaters.
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