Partial oxidation by ozone to remove recalcitrance from wastewaters--a review

Environmental Technology
A B AlvaresS A Parsons

Abstract

Xenobiotic organics produced by modern industrial processes resist conventional biological wastewater treatment. Ozone pretreatment to improve biodegradation via partial oxidation is a potential solution for this recalcitrance. Ozone forms no additional sludge, removes colour and has two modes of action that can be utilised according to the wastewater constituents. The preozonation of a variety of wastewaters and model compounds is reviewed here. Of the industrial processes examined, the associated recalcitrant organic compounds were generally halogenated heterocyclic or nitrogenous aromatics, aliphatic polymers or polyaromatics. Initial optimisation of ozone dose ensured the occurrence of partial oxidation, where over 90% parent compound transformation was required to give best results in the subsequent biological process. Ozonation intermediate and end-products included ketones, aldehydes and organic acids that were more biodegradable than the parent compounds. Biodegradability improvement was assessed using TOC, COD, BOD, BOD/COD ratio and OUR. Actual process feasibility and performance was evaluated using various combined ozonation-biodegradation trials; textile dying and finishing effluent being one area of application. Ki...Continue Reading

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