负载磁性废茶生物炭活化过一硫酸盐高效降解水中腐殖酸和富里酸

Abundant dissolved organic matters (DOM) in the secondary effluent from the wastewater treatment plants would cause potential harm to organisms and the receiving water. Therefore, it is deemed necessary to find out an advanced method for the secondary effluent treatment. In this study, a modified Fe-tea biochar (Fe-TB) was successfully prepared using the agricultural tea wastes. The Fe-TB was used to activate peroxymonosulfate (PMS) and their combination could oxidize the humic acid (HA) and fulvic acid (FA) in the wastewater. The effects of the iron loading of the Fe-TB, PMS concentrations, Fe-TB dosages, and initial pH as well as the concentrations of HA and FA on their degradation in Fe-TB/PMS process were investigated. Results showed that the removal efficiency of HA with the initial concentration of 20 mg•L^-1 was 95.3%, while FA with the same concentration was 77.4% at 50 min under the conditions of 2/1 (W/W), 0.2 g•L^-1 of PMS, Fe-TB dosage of 0.6 g•L^-1 (HA) and 0.4 g•L^-1 (FA), respectively, and initial pH 7. After recycling 4 times, the removal efficiency of HA and FA were both over 59. 0%, indicating that 2Fe-TB/PMS system has an excellent stability. The results of the quenching free radical experiments and electron paramagnetic resonance (EPR) showed that in the 2Fe-TB/PMS system, ¹O₂ as the main reactive oxygen species could efficiently degrade HA and FA. Furthermore, the 2Fe-TB/PMS system could effectively degrade DOM in the actual secondary effluent, which confirmed the efficiency of this system. Thus, the 2Fe-TB/PMS system has a promising application prospect.