CDOF Technology for Efficient COD Removal in Wastewater Treatment in Lithium Battery Industry

To address the issue of concentrated impurities such as nickel, cobalt, manganese, and COD in wastewater of lithium battery production, which are difficult to remove and cause blockages in membranes and evaporators, the Shenzhen Clear Science & Technology Co., Ltd (SINOKLE) has adopted its self-developed CDOF technology to efficiently remove COD from wastewater. 

CDOF - Cyclonic Dissolved Ozone Flotation Unit is a patented technology developed by the SINOKLE. It integrates ozone multi-catalytic oxidation, hydraulic cavitation, and cyclonic flotation technologies, making it a unique, internationally advanced, high-efficiency oxidation and flotation integrated device. This technology can efficiently and rapidly remove various pollutants such as petroleum, suspended solids, colloids, COD, and bacteria from wastewater. The system consists of an oxygen production unit, ozone generation system, efficient ozone dosing system, multi-catalytic reaction system, and cyclonic dissolved gas flotation system.

Figure 1: CDOF Process Overview

Principle of CDOF Technology

The ozone catalytic oxidation process is short, with simple equipment and small compact treatment units. The system occupies less space, requires fewer electrical devices, consumes less electricity, and has low operational costs. It is easy to operate and can be automatically controlled, simplifying on-site operations. The system can adjust to changes in both water quality and quantity, providing strong adaptability and resistance to shock loads. The system can also be combined with other technologies (e.g., biochemical treatment) to fully leverage their advantages and further enhance treatment efficiency.

Figure 2: CDOF Treatment Effect, Left: Influent, Right: Effluent

Treatment Effect

For example, in wastewater treatment at a lithium industry company, using combined catalysis with an ozone dosage of 150 mg/L, the COD was reduced from 208.6 mg/L to 179.6 mg/L, with a COD removal rate of 86%. The ozone dosage was 0.83 mg/L. The experiment showed that the ozone combined catalytic process significantly improved COD removal from the wastewater.