Treatment of Waste Cutting Oil Emulsions by Leaching Solutions of White Mud

Abstract

A leaching solution of white mud was prepared from this waste material of soda production, and used for treatment of waste cutting oil emulsion. In alkaline conditions, the leaching solution of white mud generates hydroxide precipitates, which have relatively high specific surface area and excess surface energy, and readily adsorb the pollutants in waste cutting oil emulsion. The chemical composition of the white mud was determined and the hydroxide precipitates were characterized. The maximum removal efficiency (of turbidity, oil contents and TOC) was obtained at an adsorbent dosage of 4.0 g/L, pH 12.0 and 25°C. Leaching solutions of white mud could be used as an effective and low-cost material for treatment of waste cutting oil emulsion by the precipitation method.

Research status of soda residue in the field of environmental pollution control

“…Furthermore, research was also conducted on the removal of oil-containing organic compounds, such as emulsified oil, 30 oil emulsions, 46 and petroleum sulfonate 31 from wastewater, with promising adsorption results ( Table 2 ). Studies have shown that soda residue and hydroxide particles formed in highly alkaline conditions restrict oil droplet migration via electrostatic attraction, hydrogen bonding, and particle surface adhesion, leading to the adsorption and encapsulation of oil droplets or organic components in the hydroxide crystals to effectively remove organic pollutants.…”