New Treatment Process for Coal Chemical RO Concentrate Using CDOF Cyclonic Dissolved Ozone Flotation

The treatment of coal chemical RO concentrate has become a major challenge in the coal chemical industry due to its high salinity, organic content, and complexity. The concentrate, generated during coal chemical production, contains pollutants like heavy metals, ammonia nitrogen, and organic materials that are difficult to biodegrade. Traditional treatment methods, such as reflux, coagulation, and activated carbon adsorption, have limitations, including increased membrane wear, limited effectiveness under varying conditions, and high operational costs. The high COD and color of the RO concentrate strain downstream treatment systems, making it harder to meet discharge standards and increasing treatment costs. Consequently, effective and economical solutions for treating coal chemical RO concentrate are urgently needed to address these environmental and operational challenges.

In this context, the new coal chemical RO concentrate treatment process, centered around the CDOF Cyclonic Dissolved Ozone Flotation unit, has been introduced by the Shenzhen Clear Science & Technology Co., Ltd (SINOKLE).

Coal Chemical RO Concentrate Treatment Process Flow Diagram

The process flow begins with adding coagulants and flocculants to the concentrated wastewater, followed by coagulation and sedimentation to remove some suspended solids and colloids, thus reducing the pollutant content. The wastewater then enters the CDOF ozone advanced oxidation flotation integrated device, where ozone generated by the ozone generator plays a key role. Ozone's strong oxidative properties break down large organic molecules into smaller ones, reducing COD and significantly removing color. The flotation process further separates the oxidized impurities and fine particles from the water, which are then discharged with the backwash water.

After treatment by this device, the COD of coal chemical RO concentrate can be reduced from ≤500mg/L to below 60mg/L, and the color from ≤200 to below 30, achieving significant treatment results. In terms of operational economic costs, the treatment cost for a 50m³/h system is ≤10 yuan/ton (≤ 1.5 USD/ton) of water, which not only lowers operational costs but also reduces environmental pollution, providing excellent environmental and economic benefits, and paving a new path for treating RO concentrate in the coal chemical industry.