Research On Treatment Of Wastewater By Heterogeneous Phase Fenton Reagent Oxidation Process With Fe²⁺/Activated Carbon Catalyst

Phenolic wastewater is a very typical source of pollution of aquatic systems, which originates mainly from coal-and petro-chemical industry, pharmaceutical factory, plants of producing phenol and phenolic resin, and so on. Low-concentration phenol-containing wastewater may cause the degeneration of protein, while high-concentration ones can corrode and erode drastically with skin and membrane, as well as central nervous system, liver and kidney. Therefore, how to treat the high-concentration phenol-containing wastewater effectively has become an emergency problem in the industrial application.There are many methods to deal with phenol-containing wastewater at present. Among these methods, fenton oxidation has attracted much attention because of its easy-manipulation, high efficiency and nontoxicity. As the development of environmental science and engineering technology, the research of fenton oxidation has been focused on the technology of improving oxidation efficiency in recent30years, such as UV/Fenton method, UV/H2O2method, Fe/H202method and electro Fenton method. However, economically viable separation technology of iron ions is not currently available in industrial application using this method, which may induce amount of iron-mud and increase treatment costs. In order to solve this problem, we use active carbon as the carrier to load Fe2+in our work. The amount of iron ions can be reduced by the reclamation of active carbons after reaction. It has been proved to be a convenient-operating, environmental benign and low-cost method in this paper.This work explored the optimal preperation method for the catalyst of Fe2+-loaded active carbons by treating high-concentration synthetic phenol wastewater synthesized in our laboratory. Detailed characterization has been done to analyze the reaction mechanism and determine the optimal synthetic conditions. The experimental conditions have also been optimized by improving the oxidation efficiency. Furthermore, sodium pyrosulphite has been used in our work to investigate the regeneration of the catalyst, and the activity of the regenerated catalyst has been examined. The experiment in heterogeneous fenton-oxidation system has also been done to compare with that in homogeneous system, using coke plant waste water, obtained from a chemical plant in Jiangsu province, as the contamination. The results have lived up to our expectation. The reactor used in this method has been researched, and we believe that the designation of the reactor mentioned in this paper can be a theoretical reference for the promotion of the catalyst.