Investigation of the biologically-resistant organic pollution destruction process in wastewater by ozone

Abstract

During the development of technology of ozone usage for wastewater treatment from organic pollution, it is important to be able to determine the required dose of ozone and the duration of oxidation. Ozonation is used in combination with other methods of water treatment, so it is important to determine the stage at which ozonation is used. Ozone can be used for purification of urban wastewater for the destruction of surfactants and textile dyes. These substances are often biologically resistant and cannot be removed by biological treatment methods. Decomposition of organic matter of dyes and surfactants occurs not as quickly as decrease in color. In such cases, the purification process is usually controlled by indicators such as total organic carbon content, oxidation, COD, etc. It can be difficult to determine the dose of ozone, which is necessary for the destruction of pollution. We examined the material balance of the process of destruction of some contaminants and conducted experimental studies to verify it. The technique is proposed for calculating the required dose of ozone for the destruction of dyes and surfactants in wastewater with a small number of measurements. The method makes it possible to calculate the specific dose of ozone and necessary ozonation period for destruction of pollution in wastewater.