In Situ Modified Fenton Oxidation Of Petroleum Contaminated Soil

China’s petroleum contaminated soil area, involving a wide area, difficult to repair,great harm is a major environmental problem to be solved. In this paper, wellsitepetroleum contaminated soil contamination for the study, in order to reduce soil organicmatter (SOM) oxidation rate, enhanced oil (TPH) oxidation rate target, proved suitablecitric acid concentration, H2O2concentration and in situ Fenton modified controlconditions, and analyzes the factors that stabilize the decomposition of H2O2and H2O2production of oxygen characteristics, main conclusions are as follows:（1）Six different concentrations of citric acid oxidation test results when theconcentration of citric acid17.4g/L (15mM), the soil S1and S2removal TPH and amaximum of39.35%26.21%, corresponding to a minimum of removal SOM only3.92%and2.15percent. Therefore, optimal dosing concentration of citric acid17.4g/L(15mM), at this time, H2O2produced the lowest rate of oxygen, strong H2O2stability,high utilization. Study found that adding citric acid stabilized H2O2, SOM reduces theoxidation rate.（2）Oxygen production rate of soil S2is only half the soil S1, and the soil S2,H2O2oxidation unit is two-fold The TPH of S1, the corresponding S2SOM oxidationrate is significantly below the soil S1, show that the use of H2O2soil S2higher than thesoil S1.（3）Eight different concentrations of H2O2oxidation tests show when theconcentration of H2O2900mmol/L, S1and S2TPH removal of up to two soils38.25%,21.10%, SOM removal lowest were5.47%,4.30%. (4) When adding eight different H2O2concentrations in soil S1initial reactionnO2/nH2O2were0.6677,0.4190,0.2948,0.2294,0.2001,0.1985,0.1720,0.1313. S2were0.2631,0.2307,0.1800,0.1383,0.2235,0.1927,0.1396,0.1170soil. The lower theconcentration of H2O2can be seen, the higher the proportion nO2/nH2O2, the greater theproportion of H2O2produced oxygen consumption, waste described more H2O2, H2O2efficiency lower. Soil S2oxygen production below the soil S1, S2soil over the soil S1good repair effect.(5) When dosing frequency is four times, TPH oxidation rate was the highest. forsoil S1, the concentration of700mmol/L,900mmol/L and1100mmol/TPH situoxidation rate modified system was52.52%,51.23%,51.63%; SOM oxidation rateswere2.75%,1.62%,2.62; corresponding oxidized soil TPH S2was47.27%,49.61%,46.16%, SOM oxidation rate2.41%,2.31%,1.63%; H2O2in utilization up to90%.Visible, hierarchical situ H2O2dosing method reduces the SOM modified Fentonoxidation rate and improve the utilization of H2O2.(6) H2O2concentration700mmol/L situ modification system, soil S1and S2dosing four times the rate of decomposition of H2O2decomposition rate was only whena second dosing25%and30%, respectively, extend the life of the3-fold and2-fold.H2O2concentration900mmol/L situ modification system, soil S1and S2dosing fourtimes the rate of decomposition of H2O2decomposition rate of only1second dosing32.50%and42.12%, respectively, extend the life of a2-fold and1.5-fold. H2O2concentration1100mmol/L situ modification system, soil S1and S2dosing four timesthe rate of decomposition of H2O2decomposition rate of only1second dosing32.06%and33.56%, respectively, extend the life of a2-fold and2-fold.