Efficient Treatment of Flavor Production Wastewater Using CDOF Technology for COD Reduction and Biodegradability Improvement

For the treatment of flavor production wastewater, the Shenzhen Clear Science & Technology Co., Ltd (SINOKLE) has combined its self-developed CDOF (Cyclonic Dissolved Ozone Flotation Unit) technology, which can effectively reduce the COD of the wastewater, improve its biodegradability, and facilitate the subsequent biochemical reactions.

Pic 1. CDOF (Cyclonic Dissolved Ozone Flotation Unit) Workflow Diagram

CDOF creatively integrates ozone advanced oxidation technology, cyclonic technology, and dissolved gas flotation technology to efficiently remove various hard-to-treat wastewater contaminants.

The CDOF ozone catalytic oxidation process has a short flow, simple equipment, and compact treatment units that occupy minimal space. It requires fewer electrical devices, consumes low energy, and has low operating costs. The system is easy to operate and can be automatically controlled, simplifying on-site operations. When the water quality or quantity changes, the system can adjust accordingly, demonstrating strong adaptability and impact resistance. It can also be combined with other technologies (such as biochemical methods) to fully leverage their advantages and further improve treatment efficiency. 

Pic 2. Ultrafine Bubble Effects

Ultrafine Nano-Bubble Generation Technology: The core of the technology is a system that generates micro-nano bubbles with high-efficiency dissolution, release, and mixing. These micro-nano bubbles, with a diameter of less than 50 microns, rise slowly in the water, have a long retention time, and have a high dissolution efficiency. They also possess self-oxygenation properties, carry negative charges, and are rich in strongly oxidative free radicals.

Pic 3. Small-scale Experiment for Flavor Production Wastewater Treatment. Comparison of Raw Water (Left) and Treated Water (Right).

After treatment with this process, using an ozone dose of 150mg/L, the COD was reduced to 238.8mg/L, with a COD removal of 186.55mg/L, and an ozone dose ratio of 0.80. The experimental results show that some large-molecule COD is oxidized into smaller-molecule COD, improving the biodegradability of the wastewater. This process also removes some of the COD, further enhancing the wastewater’s biodegradability and facilitating the subsequent biochemical reactions.