[Bioremediation for petroleum-contaminated soil by composting technology].

With composting technology of off-site bioremediation, the bioremediation of soil contaminated by crude oil from Liaohe Oil Field was studied. 4 treatments units were set, each units being 118.5 cm in length, 65.5 cm in width, and 12.5 cm in height. The results showed that when the soil was contaminated with 5.22 g.100 g-1 TPH, the degradation rate of TPH reached 54.2% after 55 days operation by Phanerochaete chrysosporium. The results also indicated that the major factors that effected the TPH bioremediation results were the content of O2 and CO2, the amounts of microorganism that degraded petroleum hydrocarbons, and the changes of pH in contaminated soil. These factors could directly reflect the effect of composting treatment technology, and be used to optimize the operation conditions of composting technology to reach the best result. The treatment engineering adopted periodical aired means, operated very simple, and costed very cheap, whtch provided a practical technology for the bioremediation of petroleum-contaminated soil.