Gongye shui chuli (Nov 2024)
Pretreatment of fermentation pharmaceutical wastewater by diaphragm electrochemical coupling Fenton oxidation
Abstract
The biodegradability of fermentation pharmaceutical wastewater is poor. A diaphragm electrochemical coupling Fenton oxidation process was constructed to replace the conventional Fenton oxidation pretreatment of fermentation pharmaceutical wastewater, which improved the B/C of the wastewater without increasing the inorganic salt content of the effluent. The pH regulation effect and antioxidant performance of different types of ion membranes in the anode and cathode chambers of a membrane electrochemical reactor were evaluated. The optimal process conditions for Fenton oxidation treatment were optimized and screened, and the effectiveness and cost of traditional Fenton oxidation and diaphragm electrochemical coupling Fenton oxidation processes for treating fermentation pharmaceutical wastewater were compared and analyzed. The results showed that the order of the effectiveness of the three types of membranes in reducing wastewater pH in the anode chamber was CJMC-3 cationic membrane>CJMA-3 anionic membrane>asbestos membrane. The order of the effectiveness in increasing wastewater pH in the cathode chamber was CJMA-3>CJMC-3>asbestos membrane, while asbestos membrane was more resistant to HClO oxidation and more practical. The optimal process for Fenton oxidation was to add 0.3% FeSO4·7H2O and 2% H2O2, with reaction time of 120 minutes. After traditional Fenton oxidation treatment, the effluent conductivity increased by 27.19% and the effluent B/C increased by 29.41%. Compared with traditional Fenton process, after diaphragm electrochemical coupling Fenton oxidation treatment, the effluent conductivity decreased by 21.38% and the effluent B/C increased by 31.82%, which had more advantages in reducing the inorganic salt content in the effluent and improving B/C. The operating cost of the diaphragm electrochemical coupling Fenton process was 61.61 yuan/t, which was 14.79% higher than the traditional Fenton oxidation process (53.67 yuan/t). Future research should focus on improving current efficiency to reduce the energy consumption per ton of water in the operation of the new process .
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