Efficacy of Advanced Oxidation Processes for Elimination of Objectionable Contaminants from Wastewater Effluent

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 ABSTRACT

Increasing demand for reclaimed water from wastewater treatment facilities has revolutionized the need for awareness of effluent quality and its properties. Wastewater can be made suitable for many reuse applications. Many of these applications for reclaimed water in industry, agriculture, and other beneficial uses have required stricter controls on the effluent quality from wastewater plants. These controls may apply to microbial pathogens, disinfection-by-products, or endocrine disruptors. In 1956, a paper to the Virginia Section meeting of the American Waterworks Association titled Destruction of Microorganisms in Water, Sewage, Sewage Sludge by Ionizing Radiation, Lowe, Lacy, Surkiewicz, and Jager concluded that it was possible to kill or inactivate pathogenic microorganisms in water by 60Co gamma irradiation. Disinfectants such as chlorine, chloramines and ozone, react with natural organic matter to form disinfection-by-products (DBPs), many of which are regulated. Endocrine disruptors represent an emerging concern for their impact to the environment and fate within the ecosystem. Advanced oxidation processes using free radical chemistry represent a reasonably viable alternative to chemical additives such as chlorine or ozone for removal or elimination of objectionable contaminants from water. The process for production of free radicals has been well established. This paper explores the efficacy for use of advance oxidation processes using free radical chemistry for the elimination of
objectionable contaminants from wastewater effluent and for reuse applications. Central to the focus of this paper will be the application of reuse water to the paper mill industry and agriculture. Relevant data and information on the needed reuse water quality criteria required for various processes are addressed and the criteria for treatment for removal of unwanted or objectionable contaminants will be identified.

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