Method for restoring oil-contaminated soil by using wild ornamental plant iris lactea

Abstract

The invention discloses a method for restoring oil-contaminated soil by using wild ornamental plant iris lacteal. The method comprises the following steps of (1) planting the iris lacteal into petroleum hydrocarbon contaminated soil the mass concentration of which is 1%-4% by adopting ramet seeding, and watering in time to keep the soil water-holding capacity at 60% of water-holding capacity; (2) taking away the plant from the contaminated soil and planting the iris lacteal again when the plant achieves a mature period, or taking away an overground part of the plant to make sure the root of the plant to become a new plant, and repeating the planting process until the petroleum hydrocarbon content in the soil achieves a nation environmental standard or ecological safety index. The method disclosed by the invention has the advantages that the iris lacteal has certain tolerance and good restoring capacity on the low concentration and high concentration petroleum hydrocarbon contaminated soil, the operation is simple, the cost is low, the secondary pollution is not generated, the iris lacteal does not enter a food chain, a soil structure is improved, and the environment is beautified, so that the method is suitable for the restoring operation of large-area petroleum hydrocarbon contaminated soil.

Description

technical field [0001] The invention relates to an environment restoration technology of organic polluted soil, in particular to a method for repairing oil-polluted soil by using a wild ornamental plant iridium iris. Background technique [0002] In recent decades, with the advancement of industrialization, the exploration, exploitation and refining volume of my country's petroleum industry has continued to soar. According to statistics, 80% of China's oil comes from land oil fields, and the annual output of oil has exceeded 1000 × 108 kg, and this value is still growing. Reference 1: Lin Xin, Li Peijun, Tai Peidong, etc. Oil polluted soil Research progress of phyto-microbial remediation[J]. Journal of Ecology, 2006, 25(1): 93-100. However, while oil meets human needs, it also produces a lot of pollution. In the process of oil extraction, processing, maintenance, transportation and storage, crude oil will inevitably be produced, and oil spills, leaks, blowouts and other a...

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Problems solved by technology

However, there are few studies on flower phytoremediation under high concentration pollution, and there are no reports on the remediation of wild ornamental plants.

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