Effect of Microwave-assisted Silicon Carbide on pH/COD of Coking Wastewater

In this paper the effect of microwave irradiation and silicon carbide absorbing microwave on the pH and COD of coking wastewater had been studied by changing the microwave heating temperature,the type and amount of silicon carbide.When the time is fixed,the increase of microwave temperature can significantly reduce the pH of the coking wastewater.The pH of the coking wastewater after treatment is close to neutral.When the microwave temperature is 90 ℃,the pH of the coking wastewater is 7.78.Increasing microwave heating temperature helps to remove COD.The highest COD removal rate was 23% at a heating temperature of 90 ℃.The co-treatment of green silicon carbide and microwave can achieve the better effect of reducing the pH of coking wastewater.When the mass of green silicon carbide is 5 g,the pH is 7.89.Compared with green silicon carbide,black silicon carbide has achieved better effect of improving the removal rate of COD and the highest COD removal rate is 25%.