High chemical oxygen demand (COD) wastewater mainly comes from industries such as chemical, printing and dyeing, food processing, and pharmaceuticals. Its organic pollutant concentration is high, the composition is complex, and the treatment is difficult. If directly discharged, it will seriously pollute the water environment. With the increasing scarcity of water resources and the increasing demand for environmental protection, the treatment and resource recycling of high COD wastewater have become key links in the sustainable development of industry. This article will recommend a high COD wastewater treatment company - Suzhou Isbe Environmental Protection Equipment Technology Co., Ltd., to see how they treat high COD wastewater.

The characteristics of high COD wastewater are significant differences in biodegradability, and some wastewater contains toxic substances that inhibit microbial activity. Therefore, the treatment process needs to be designed according to the characteristics of water quality. Common processing techniques include physical and chemical methods, biological treatment methods, and their combined processes.

The pretreatment stage usually uses methods such as coagulation sedimentation, air flotation, and advanced oxidation (such as Fenton oxidation and ozone oxidation) to effectively degrade recalcitrant organic matter and improve the biodegradability of wastewater. Subsequently, it enters the biochemical treatment stage, such as anaerobic aerobic (A/O), sequencing batch reactor (SBR), membrane bioreactor (MBR) and other processes, which can efficiently remove organic pollutants and reduce COD values.

In the advanced treatment stage, processes such as reverse osmosis (RO), nanofiltration (NF), activated carbon adsorption, or ultraviolet disinfection are used to further remove residual organic matter and salts, ensuring that the effluent meets the reuse standards. After multi-stage treatment, the effluent can be reused for production cooling, flushing, boiler supply and other processes, achieving efficient recycling of water resources.

Sludge reduction and resource utilization are also important directions for high COD wastewater treatment. Producing biogas through anaerobic digestion can be used for power generation or heating, achieving energy recovery; Dehydrated and dried sludge can be used as fuel or building materials to reduce environmental pollution.

In the future, we should promote the development of high COD wastewater treatment technology towards energy conservation, intelligence, and resource utilization, combining new materials and processes to improve treatment efficiency and reduce operating costs. At the same time, we will improve the policy support system, encourage enterprises to carry out wastewater recycling, and help promote green and low-carbon transformation.