Study on synergistic desorption of polychlorinated biphenyls(PCBs) by biosurfactant and chemical surfactant from contaminated soils
生物与化学表面活性剂协同洗脱土壤中PCBs的研究

Batch experiments and column experiments were performed to study synergistic desorption of polychlorinated biphenyls(PCBs) from contaminated soils by biosurfactant rhamnolipid(RL) and chemical surfactant,polyoxyethylene 6 lauryl ether(POE(6)).The results showed that desorption percentage of PCBs from the same soil by batch experiment was slightly higher than that by soil column experiment.Desorption rate of PCBs from laboratory contaminated soil by RL or POE(6) was more than 60%,but that from field contaminated soil was less than 20%.The greater the TOC of soils,the lower the desorption rate of PCBs.At binary mixed-surfactants concentration of 301 mg/L(10 CMC) and 1 050 mg/L(50 CMC),PCBs from laboratory contaminated soil were obviously synergistically desorbed by RL and POE(6).At the concentration of 301 mg/L,PCBs from field contaminated soil were not able to be synergistically desorbed by RL and POE(6).When the concentration increased from 301 mg/L to 1 050 mg/L,PCBs from field contaminated soil were obviously synergistically desorbed by RL and POE(6).