The Influence Factors Of Potassium Permanganate Oxidation TCE And Explore The Countermeasures

In this study TCE was chosen as the target contaminant,focusing on using of in situ chemical oxidation with potassium permanganate in TCE-contaminated site’s three influence factors,permanganate oxidation TCE was studied in batch,slurry system,flow-through column,to attain the influence factors of potassium permanganate oxidation TCE and explore the countermeasures,draw the following conclusions:(1)Water phase batch and mud system experimental results show that the dose of potassium permanganate more,the degradation of TCE better;pH and temperature had apparently negative effects on the remove of TCE;The mainly ions of groundwater,such as Cl-,Na+,HCO3-,K+had less effect on TCE removal;The competition response could happen between Fe2+、humic acid and TCE,could apparently negative effects on TCE oxidation;The ionic strength had greatly effected on the MnO2 precipitate formation.Organic carbon is the primary reactive species of NOD in the sediment and it is the main factors of influence potassium permanganate oxidation TCE in the underground environment;The NOD21 increases with a higher initial potassium permanganate concentration for all sediment types and the greater the NOD value,the greater effect of potassium permanganate oxidation of TCE;The permanganate consumption over time could separate into two parts depend on the rate of permanganate decreasing:the fast reactions and the slow reactions.(2)Water phase batch and column experimental results show that the combination of HMP with SDS in permangance oxidation for TCE remediation can improve contaminant removal,can prevent the reaction process of manganese dioxide particle deposition and improve chloride ion production.When the velocity and the concentration of potassium permanganate was larger,the TCE-DNAPL contaminants could more rapidly degraded;The degrees of TCE-DNAPL mass depletion enhancement was higher for higher velocities compare with higher oxidant concentrations.The organic matter content of porous medias was higher,generated more manganese dioxide precipitation,the more the greater influence of flushing speed and after flushing,the larger TCE rebound;Sodium hexametaphosphate had the best performance for stabilizing MnO2 particles,so it could weaken the effect of TCE rebound.