摘要：Medium and low temperature coal tar full-dis- tillate hydrogenation wastewater has irreversible damage to the environment. In this paper, the biolog- ical aerated filter method is integrated with the elec- trocoagulation method and the chemical precipita- tion method, and the electrocoagulation method andthe chemical precipitation method are compared and analyzed. This study aims to reveal the influence of the current density and the power-on time on the heavy metal removal rate in the electrocoagulation method to achieve the purpose of recycling coal chemical wastewater. The results show that the opti- mal pH value of sodium hydroxide used in the chem- ical precipitation method is 8, and the removal rate can reach 34.8%-94.6%. As the current density and energizing time increase, the removal rate of heavy metals increases. When the electrification time is 40 min, the current density is 500 A/m2, and the PH value is 2.5, the electrocoagulation method has a higher removal rate than the chemical precipitation method. By comparing the removal rate of heavy metals and the amount of filtered waste, the applica- tion effect of the electrocoagulation method is better than that of the chemical precipitation method. Elec- trocoagulation technology has the potential to re- place traditional coal chemical wastewater treatment technology to recycle the coal chemical wastewater, meeting the water quality standard of circulating cooling water.
关键词：Coal chemical wastewater;biochemical method;electro-
coagulation method;heavy metal
