期刊
JOURNAL OF HAZARDOUS MATERIALS
卷 410, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.jhazmat.2020.124533
关键词
Polycyclic aromatic hydrocarbons; Surfactant; Bacteria; Hydrogel beads; Sorption; Biodegradation
资金
- National Science Fund for Distinguished Young Scientist, China [41525005]
- National Natural Science Foundation of China [41821005, 41629101]
The study explored the use of a simultaneous sorption and biodegradation technique to remove organic pollutants from soil washing solution by immobilizing bacteria in hydrogel beads. The findings showed that beads with immobilized bacteria at a medium concentration can remove 77% of PAHs in 96 h, providing a sustainable and efficient method for industrial application.
Soil washing process enhanced by surfactants is a promising technique in removing organic pollutants from soil. In this work, a simultaneous sorption and biodegradation technique was used to remove 16 PAHs from a soil washing solution (SWS) obtained by rinsing a heavily contaminated soil from a coking plant with Triton X-100 (TX-100). This was done by immobilizing a pyrene-degrading bacterial strain in polyvinyl alcohol-sodium alginate (PVA-SA) hydrogel beads. Removal performance of free bacteria, blank PVA-SA beads and beads with immobilized degrading bacteria at a low, medium and high initial concentration was evaluated. The recycling and removal performance of the used beads were also examined. Our findings showed that hydrogel beads with immobilized bacteria at a medium concentration can remove around 77% ?16PAHs from SWS in 96 h. The beads can be recycled and reused to treat a new SWS; 32?55% ?16PAHs was removed in 24 h. The bead provided protection for bacteria against the co-existing substances such as TX-100. The bacteria-immobilized beads are more efficient and sustainable than free bacteria and blank beads due to simultaneous sorption and biodegradation processes, thus providing a solid reference for possible industrial application of bacteria immobilization technique to deal with SWSs with complex composition.
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