The Mechanism Research On The Surfactant-enhanced Remediation Of The Soil Polluted By DP

Dechlroane Plus (DP) is a new type chlorinated flame retardants, which has high chlorine content, stable physical and chemical properties, refractory, thermal resistance and bioaccumulation etc. Therefore, the domestic scholars and foreign scholars to repair Dechlroane Plus in environment pollution is a hotspot research.In this paper, taking new environmental pollutants high chlorinated flame retardants DP and surfactant as surfactant-enhanced remediation(SER) research objects. Reviewing the research progress of the pollution and testing technology of DP and the organic contaminated soil in surfactant-enhanced remediation.As the main part, studying the solubilization and solubilization mechanism of DP in cationic surfactant dodecyl trimethyl ammonium bromide (DTAB) and anionic surfactant sodium dodecyl sulfate (SDS) and nonionic surfactant lauryl alcohol polyoxyethylene ether (Brij35) solution respectively. At the same time, researching the elution effect of DP polluted soil in three kinds of surfactant solution ans the impact of various factors to DP polluted soil in the elution process, Tht surfactant micelles have formed in aqueous solution is the key to solubilization, and the formation of micelles in aqueous solution is relevant to the surfactant concentrations.The experimental results showed that under the CMC values, the solubilization effect of DP in the three kinds of surfactant solution is similar; but above the CMC values, with the increase of surfactant concentration, the apparent solubility of DP appears linear increase in water. In the oscillation time (48 h), the solubilization ratio and the distribution coefficient of three kinds of surfactants and the apparent solubility of DP appers positively correlated, the result:MSRBrij35> MSRSDS> MSRDTAB; KmcBrij35> KmcSDS> KmcDTAB. Which explain that the solubilization effect of DP in nonionic surfactant solution better than that ionic surfactant solution.Meanwhile, studing to the elution of DP contaminated soil in Brij35, SDS and DTAB three kinds of surfactant solution, the nonionic surfactant Brij35 under the condition which the concentration 8 g/L, temperature 25 ℃ solid-to-liquid ratio 1:20, after elution 2-3 times, the maximum elution rate can reach 63.91%. At the same time, the study also found that the inorganic salts has litter influence to the elution effect, and the influence of the temperature and humic acid have larger influence to the elution effect, the influence of temperature may affect the surfactants CMC values, the humic acid has a certain synergy. The research results can provide a feasibility theory basis for the surfactant-enhanced remediation DP polluted soil in the practical application.