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Hydrogen Peroxide Interference in Chemical Oxygen Demand Assessments of Plasma Treated Wastewaters

Plasma-liquid interaction generates hydrogen peroxide, ozone, and other reactive species along with ultraviolet radiation and short-lived highly reactive hydroxyl radicals, thus representing a novel advanced oxidation process for removal of recalcitrant organic compounds and overall chemical oxygen demand (COD). The COD test is ubiquitous in wastewater treatment as a measurement of the pollution potential of organic matter present in the waste stream; however, residual hydrogen peroxide from plasma treatment interferes with COD analysis by reducing the potassium dichromate oxidizing agent. The magnitude of this interference is investigated by dosing waters with hydrogen peroxide by chemical solution and by dielectric barrier discharge plasma jet, and then measuring the residual peroxide and COD of the samples. Corresponding samples are aerated to strip the hydrogen peroxide and the COD is assessed. Tests are performed with deionized water, as well as diluted solutions of methylene blue and ethylene glycol.