The Study Of Bisphenol A Degradation By Advanced Oxidation Technology

Nowadays, the electronics manufacturing industry is developing rapidly, resulting in a large number of electronic wastewater. This wastewater containing bisphenol A and other endocrine disruptors organic compounds have greater reproductive toxicity, embryo toxicity and other hazards on human and biological. Conventional electronic waste water treatment process focuses on the removal of heavy metal pollutants in water, ignore the organic pollution control. Fenton technology in organic wastewater treatment is a common technique, with strong oxidizing, fast and efficient removal of organic matter and other features. In recent years, the sulfate radical(SO4?-) which represented by advanced oxidation technology has been studied extensively at home and abroad. Under certain conditions, the oxidation capacity of the sulfate radical is stronger than that of the hydroxyl radical. In addition, the use of UV-assisted advanced oxidation technology is a hot topic, with strong oxidizing reaction rate, and no secondary pollution, degraded completely and so on.This paper examines the performance and characteristics of Fenton degradation bisphenol A. The single factor experiment of Fenton oxidation remove bisphenol A get the optimal conditions is: C(H2O2)/C(Fe2+) ratio was 10(mole ratio), p H=3.5, while higher temperatures is favor to the degradation of bisphenol A, and the degradation rate increased with the reaction temperature. To better understand the principles of Fenton oxidation degradation of BPA, GC-MS was used to analyze intermediate oxidation process. Fenton process of degradation of bisphenol A was found capable of destroying the molecular structure of a BPA, it would break BPA molecule’s chemical bond between benzene ring and isopropyl, then BPA generate hydroquinone, phenol, isopropyl phenol and other intermediate products.This paper examines the performance and characteristics of PMS+Co2+/Fe2+/Cu2+ degradation bisphenol A. This is an effective oxidation technology. Through single factor experiment showed that: Co2+ catalytic effect of PMS compared to Fe2+, Cu2+ is better, C(PMS)/C(Co2+) ratio was 20(mole ratio), p H=2.5, p H=3.5, or in the range of 6 to 11 had a good degradation of bisphenol A, p H=7 optimum. PMS concentration increases, it can increase the degradation rate of bisphenol A, the temperature of reaction less than 15 ℃ is not conducive to the oxidative degradation, the rest of the temperature are more appropriate,it set in the normal temperature is well. GC-MS was used to analyze intermediate oxidation process.The analysis infers that the PMS/Co2+ method would break chemical bonds between benzene ring and isopropyl and the bond between benzene ring and hydroxyl, then BPA phenol, 4-Isopropylphenol, 4-Cumylphenol and other intermediate products, determining the degradation pathway of bisphenol A.Assisted by UV, UV/Fenton and UV/Co2+/PMS methods can improve the ability of degradation of BPA, the amount of processing is increased. In BPA with 2mg/L in water, two methods have better removal effect, and have been widened to the initial p H range, especially UV/Co2+/PMS method, in the range of p H=2~11 are all good for BPA degradation.Finally through the treatment effect and economic analysis on a Shenzhen electronics factory actual bisphenol A wastewater, recommend UV/Co2+/PMS as the wastewater treatment from a cost point of view, but Co2+ is potentially harmful, it need to improve the catalyst. From the viewpoint of environment-friendly, consider using UV/Fenton method, because this method’s oxidant and catalyst relatively non-toxic,and the water is already show acidic, without or with a small amount of acid the p H was adjusted to 3.5.