Degradation Of Reactive Brilliant Red X-3B By Cobalt-bicarbonate Complex With Hydrogen Peroxide As The Oxidant

The printing and dyeing wastewater is difficult to degrade, and has been widely regarded as one of the problems of water pollution prevention at home and abroad, it is known that with its industry emissions, waste water composition complex water quality, waste water with deep chromaticity, high content of organic harmful compounds, and other characteristics. In the study of printing and dyeing wastewater treatment, Fenton oxidation process is an effective advanced oxidation, it can produce strong oxidizing free radicals OH, degradation of organic pollutants (pops) in the treatment of printing and dyeing wastewater effectively. However, the Fenton system application generally show better under the condition of partial acid than in the neutral and alkaline conditions is bad, and the research about similar Fenton system is less in the neutral and alkaline range currently. This study can provide us a simple, effective and economic system ideal for the pretreatment of toxic and nonbiodegradable organic pollutants m water.First, in order to examine the performance of Co2+(5μmol L-1) in NaHCO3(10mmol L-1) solution activating H2O2(4mmol L-1) oxidation degradation of reactive brilliant red X-3B (67.5μmol L-1), it was found that after a reaction of15min,85%of X-3B was removed by the system while the pH value was8.2. In addition, this system can be used in wide pH dose threshold, room temperature, under the condition of low input. The result confirmed that the Co2+-NaHCO3-H2O2system can degrade organic pollutants in alkaline condition; it is a new type of high efficient activation of H2O2system.Second, with the aim of employing the Co2+-HCCb system as pretreatment to dye wastewater, the biodegradability enhancement of X-3B and the impact of H2O2concentration were investigated. The result showed that X-3B was effectively degraded by the Co2+-HCO3system under various mild conditions, and the BOD5/COD ratio of the dye solution could markedly increase from0.046to0.46. The effluent treatment by the system was efficiently post-treated in a batch biological reactor with the COD removal around44%after8h aeration, while a little decrease of the COD value of the raw solution was observed.Finally, through the analysis of intermediate with the ESI-MS and IC method, it was found that the dye molecules were transfered into some simple macromolecular intermediates and biodegradable after the system process, and the biodegradable of system properties improved, so the subsequent biological treatment effect is better.