Comparative study of ozone treatment and magnetic field treatment in the fractionation of organic matter and hydrocarbons in gray water

Abstract

Wastewater treatment processes are very important and economical to improve the quality, and remove the greater part of the contaminants from wastewater and therefore to solve the water crisis, which may provide new sources of water. To conserve water, it must be recycling the gray water (GW). In this study, gray water will be treated using two methods, chemical using ozone and physical using magnetic field. The use of ozone in water treatment is a chemical treatment based on the infusion of ozone into water or wastewater. In this study, the best conditions for treating gray water with ozone were investigated to achieve the best removal of organic matters represented by chemical oxygen demand (COD), Biochemical oxygen demand (BOD₅), Total organic carbon (TOC), Oils and Greases. It was experimentally concluded that the ozone treatment is positively affected by the increase in pH, as well as the ozone concentration and the time of exposure to ozone. The ideal conditions for ozone treatment were determined according to the quality of the resulting water and not according to the removal values of organic materials, and these conditions are pH 8, ozone concentration 40mg/l and ozone exposure time 30 min. Magnetization treatment depends on the strength of the magnetic field and the time of exposure to it, the treatment was tried with four magnetic intensities 5000,6000,7000,8000 gauss and five exposure times 30,60,90,120,150 minutes at pH 8 and normal temperature. It was found that increasing the magnetic intensity leads to a decrease in the removal of organic matter, where the best magnetic intensity to achieve the best removal is 5000 gauss and increasing the time has a positive effect. Therefore, the optimum conditions were determined: 5000 and a time of 30 minutes.