There are many kinds of waste water, from the source of waste water, the water brought by coking coal, the water recovered during the process of recovery and refining of coking products, the water converted by direct steam, the process medium, the washing salt, etc. The water brought in by the agent, the process pipeline equipment, etc., the water to be added, the oil tank water, and the like. From the way of its discharge, there are residual ammonia water separated from the coke oven gas condensate, coke product recovery and separation process water in the process of refining, and other sewage, belonging to refractory industrial wastewater. At present, the domestic technology for treating coking wastewater mainly uses biochemical method. The biochemical method has a good removal effect on phenols and benzenes in wastewater, but some quinolines, anthraquinones, pyridines, carbazoles, etc. The poorly degradable organic matter treatment effect is poor, making it difficult to achieve the first-class standard for CODcr drainage in the coking industry.
In the process of electrolytic treatment of organic wastewater, the electrode not only plays the role of transmitting current, but also catalyzes the oxidative degradation of organic matter. Therefore, the choice of electrode material directly affects the degradation efficiency of the organic matter. The main competitive side reaction of the electrocatalytic oxidation process is the precipitation of anode oxygen (for the wastewater containing more Cl- ions, it may also be the precipitation of chlorine). Therefore, a necessary condition for the catalytic electrode is to have a high oxygen evolution. Potential.
The titanium electrode for sewage treatment organically combines various processes such as adsorption, surface catalysis, redox and the like, effectively reducing the CODcr of the coking wastewater, and by using the biological method, can stabilize and improve the external drainage quality, and finally Reach the purpose of reclaimed water.