Study On Treatment Of Nitrophenol Wastewater By Micro-electrolysis And Pyrolusite Oxidation Process

Systematic investigation the degradation efficiency, effect factors and their kinenic charactertics of the decomposition of p-nitrophenol in water by micro-electrolysis and pyrolusite oxidation process were carried out in this paper. And reaction mechanisms of degradation process were also studied detailed. Depending on the analyses of the intermediates during the degradation of pollutants, degradation pathway for p-nitropnenol was proposed. In addition, the application feasibility of the novel advanced oxidation technology in practical industries was discussed pretimimarily.The experiments indacate that the the optimum applicable parameters of micro-electrolysis are : the quantity of Fe scraps is 2.0g/100mL, Fe/C is 2:1, pH is 2.0, vibration speed is 200r/min, the temperature is higher than 20°C and reaction time is 3 hours. And the degradation of 100 mL pretreated wastewater with micro-electrolysis needs 1.0g pyrolusite when pH is 3.0, the grain size of mineral is smaller than 180μm , vibration speed is 150r/min and reaction time is 2 hours at the ambient temperature. The removal of COD_C(?) is 97% and that of TOC is 89% ater degradating. The pathway of degradation might be: the nitrophenol were deoxidizing to p-aminophenol and the p-aminophenol then were oxidated to H₂O,CO₂.On the base of studies on simulative p-nitrophenol wastewater, we studied the effect factors and their kinenic charactertics of the decomposition of high concentration p-nitrophenol wastewater. The experiment indacated: The removal of COD_Cr is 85 % and BOD₅/COD_Cr is up to 0.22 from 0.01 by micro-electrolysis and pyrolusite oxidation process.