應用Electro-Fenton程序處理抗生素廢水(TMP) 之研究

Abstract

Fenton oxidation process, which is one of the advanced oxidation processes, is performed by reacting ferrous ions with hydrogen peroxide to generate hydroxyl radical (•OH) under acidic conditions. This process produces a high oxidation ability, non-selective hydroxyl radical which can oxidize a variety of organic matter in the wastewater. Further the powerful oxidizing capability to oxidize organic matter of the wastewater to carbon dioxide and water. In the present study, the application of Electro-Fenton process for the degradation of antibiotic Trimethoprim (TMP) wastewater with the appropriate parameters to explore the mineralization and removal capacity was investigated. The material of cathode and anode were, respectively, stainless steel net and stick used in the system. H2O2 can be electro-generated by reduction of oxygen in the cathode, and ferrous ions can be produced by oxidation of iron in the anode. Based on the results of background experiment, the optimal parameters for electro-generated H2O2 was at current of 1.5 A and air flow of 0.7 NL/min. Under these conditions, the maximum remnant of H2O2 was 57.32 mg/L in 180 min of operation. The formation rate was 0.05582 mg-H2O2/min in 30 min before the reaction. Results show that the Fenton process can degrade 10 mg/L TMP by using 10 mg/L ferrous ions and 50 mg/L hydrogen peroxide in acidic solution after 60 min. The TMP removal rate is 19.3 %. When the treatment time is extended to 360 min, the TMP, COD and TOC removal rates are 32.1, 29.2, and 28.1 % respectively. Electro-Fenton oxidation process with optimal parameters found in generation experiment, the TMP removal rate is 66.0 % after 180 min. When the treatment time is extended to 360 min, the TMP, COD and TOC removal rate are 71.8, 59.4, and 53.6 % separately. The results are significantly better than traditional Fenton oxidation process. The COD removal rate and mineralization are also enhanced. Electro-Fenton oxidation process is conducive to the removal of TMP, and enhance the mineralization.