Sustainable Mining and Metallurgy

Ultrafiltration technology is widely used in water treatment, and coagulation pretreatment is one of the effective technologies to control ultrafiltration membrane fouling. In this paper, the characteristics and influencing factors of Bisphenol A (BPA) removal by coagulation, ultrafiltration and coagulation-ultrafiltration were studied. The results show that the removal of BPA by aluminum sulfate coagulation is limited. When the dosage of aluminum sulfate is 15mg/L and pH value is 7, the removal rate of BPA is the highest, and the Zeta potential is close to the isoelectric point. Increasing humic acid concentration is not conducive to BPA removal. In the study of influencing factors of ultrafiltration, the smaller the initial BPA concentration and the smaller the pore size of ultrafiltration membrane , the higher the removal efficiency of BPA. When the pH value is close to the acid dissociation constant of BPA, the removal effect of BPA becomes worse. Compared with the single coagulation or ultrafiltration process, the removal rate of BPA of the combined coagulation-ultrafiltration process is higher, which indicates coagulation preteatment has good effect and is beneficial for reducing membrane fouling. With the increase of aluminum sulfate dosage, the removal effect of BPA by coagulation-ultrafiltration combined process is enhanced. With the increase of initial concentration of pollutants, the removal rate of BPA decreased.