The Study Of The Remediation Of Soil Polluted By Nitrobenzene And The Disposal Of Leaching Water

The disposal of the organic substance that is difficult to degradation is a difficulty in environmental management. The aggravation of siol pollutant is becoming an urgently problem. Nitrobenzene (NB) is the important organic chemistry industry materials, the stabilization of the nitrobenzene makes it sustained in soil, enter the human body by the food chain, so the nitrobenzene is one of the 129 pollutants "Blacklist" of EPA.This subject used leaching method to carry on the preliminary repair of soil polluted by nitrobenzene, and used active carbon particle electrode electrochemical reactor to deal with the leaching water.Experimental studies indicated that surfactant TX-100, Brij35, SDBS enhanced the dissolvability of nitrobenzene in aqueous solution, but the the elution efficiency of nitrobenzene from the soil by the three surfactants were not obvious than distilled water.Therefore, further analyzed the surfactants's adsorption characteristics on soil, their respective adsorption equation was simulated. TX-100 and on the Brij35 soil's adsorptive capacity assumes the linearity to grow. SDBS in soil adsorption divided into two stages, linear isothermal stage and exponential growth isothermal stage.The adsorption experiments of organic pollutants in the presence of surfactants in the soil showed when different concentrations of TX-100, Brij35, SDBS existence the nitrobenzene on soil adsorption isothermal is the straight line, and may use the linear equation to fit for very well, Q=K_a×C_e. Moreover the surfactants can increase soil adsorption of nitrobenzene, the higher the concentration the greater the rate of increase.Optimized the technological parameter of the electrocatalytic oxidation of leaching wastewater, the influence size of factors for the removal of nitrobenzene were in turn, current strength, electrolysis time, pH value; The best level of various factors, the strength of current is 3A, the electrolysis time is 60min, initial pH value of influent water is 3. The single factor experiment's research had determined the most economical effective technological conditions, the strength of current is 2A, the electrolysis time is the 40min, pH value is 3.The experimental result also indicated that under the different experimental condition, ln(C₀/C) becomes the linear relationship with reaction time t, explained that the nitrobenzene degradation conforms to the first-level reaction kinetics model.This shows that the particle electrode technology has the great significance to processes the organic pollutant of high concention and that is difficultly to degrade, through further research and improve the practical electrode technology may form to a practicle method of wastewater pretreatment and advanced treatment.