TREATMENT OF WASTEPAPER PULPING EFFLUENTS BY FENTON PROCESS

摘要

The treatment of wastepaper pulping effluents was carried out by using Fenton reagent. The main parameters that govern the complex reaction system, i.e. Fenton reagent ratio, pH, H2O2 initial concentration and temperature, were studied. The Fenton reagent ratio ([H2O2]/[Fe(II)]) between 5: 1 and 50: 1, and pH between 2.0 and 4.0, and the concentration of H2O2 between 1/4 and 2 times theoretical demand, and the temperatures between 30°C and up to 50°C were chosen. The effluent was characterized by the maximum absorbance at 290nm (ab. ABS290) and the UV-Visible spectrum. The Fenton reaction has been proved to be highly effective for the treatment of such industrial wastewaters. Up to 86% ABS290 can been removed in 15 min reaction ([H2O2]/[Fe(II)]=10: 1, H2O2 dosage=1679ppm, T=30°C, pH=2.8). It was found that the ferrous dosage plays an important role of accelerating the ABS290 removal, while the H2O2 dosage controls the overall efficiency of ABS290 removal. The optimum Fenton reagent ratio and pH is 10: 1 and 2.8, respectively; and the H2O2 theoretical demand is enough to ensure the ABS290 removal. Temperature ranged from 30°C to 50°C hasn't a great effect on ABS290 removal when Fenton reaction runs under enough reagent dosage and adequate reagent ratio.