电-Fenton法预处理青霉素废水的降解规律研究

A study on degradation rule of pretreatment of penicillin G wastewater by electro-Fenton process

研究电-Fenton法预处理青霉素钠(penicillin G sodium,PGN)模拟废水的降解规律,分析预处理过程中PGN浓度、COD、TOC的变化情况及BOD5/COD改善情况。当T=20℃、pH=3时,投加0.5 g/L FeSO4、0.2 mL/L H2O2,于0.3 A电流下降解浓度为100 mg/L的PGN废水,120 min后PGN去除97.9%,COD去除76.7%,TOC去除59.8%,BOD5/COD由0升至0.4,有效提高了废水的可生化性。以红外光谱(infrared spectrogram,IR)和液相色谱-质谱联用(Liquid chromatogram-Mass chromatogram,LC-MS)检测青霉素钠的降解产物,说明青霉素钠抑菌的关键结构b-内酰胺环被破坏,抗菌性消失,有助于生物处理有效去除。

The degradation rule of pretreatment of penicillin G sodium （PGN） simulate wastewater by electro-Fenton has been investigated. Trials were performed in a batch reactor, aiming at both analyzing the decrease of PGN concentration, COD, TOC and the enhancement of BODSCOD. Operating at T = 20℃, pH = 3, [ Fe- SO4] =0.5 g/L,[H2O2] =0.2 mL/L, [PGN] =100 mg/L and electric current =0.3 A, about 97.9% of PGN, 76.7% of COD, 59.8% of TOC were removed and an increase of the BODJCOD ratio from 0 to 0.4 was achieved after 120 min. The detection of PGN degradation products was based on infrared spectrogram （IR） and liquid chromatography-tandem mass spectrometry （LC-MS） , the result showed that the b-lactam cyclic of PGN was broken and PGN could be degraded by biological treatment after oxidation on electro-Fenton as it lost the antiseptic ability.