Soil column was equipped with the sediments and aquifer media collected from Weihe Riverbed and its bank, and was used to research the characteristics of aniline degradation in the riverbank filtration under sulfate-reducing conditions. The results show that most aniline could be degraded, even be mineralized by the indigenous microbes under sulfate-reducing conditions, but had a long lag period. The aniline degradation and sulfate reducing produce some intermediates, some of which are harmful to sulfate-reducing microorganisms. In the test process, aniline concentration in infiltrating water was about 33 mg/L, and in leacate increased from 0 to 22.7 mg/L, then dropped and kept at 2 mg/L or so. Aniline removal rate was 93.94% and total organic carbon removal rate was 62.13%. One of intermediates is H 2 S the most harmful to the microorganisms. The lag phase was about 14 days
Abstract. Phytoremediation is becoming a cost-effective technology for the in-situ clean up of sites polluted with hydrophobic organic contaminants (HOCs). The major factors limiting phytoremediation are the mass transfer, rate of plant uptake, and microbial biodegradation of HOCs. To evaluate the potential of surfactants to enhance phytoremediation for HOC-contaminated sites, the efficacy of Sudan grass, at the absence or presence of polyoxyethylene sorbitan monooleate (Tween 80), on the degradation of benzo[â ]pyrene (BaP) in soils were investigated, and mechanisms of surfactant-enhanced phytoremediation (SEPR) were discussed. Results showed that the presence of Tween 80 enhanced dissipation of BaP at initial contents ranging from 20.24 to 321.42 mg/kg. During the 70-d SEPR-experiments, about 731.84~469.99‰ of BaP was removed from planted soils, only 242.28~122.79‰ degradation of BaP occurred in unplanted ones. With the presence of Tween 80, the dissipation ratios of BaP in planted ones were increased up to 863.94~609.63‰, which was 139.64~ 190.16‰ higher than those in corresponding soils without surfactant. Among all possible pathways, contribution of plant-microbial interactions on dissipation of BaP was the most significant, either at the presence (456.73‰) or absence (515.58‰) of Tween 80, were the primary means of contaminant degradation. Results suggested SEPR may be a feasible way for reinforcing removal of HOCs in contaminated sites.
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