Method for treating soil heavy metal combined pollution

Abstract

The invention relates to a method for treating soil heavy metal combined pollution. Simultaneously the earthworms are bred and the ramie is planted in the soil. The part of the ramie on the ground is regularly harvested in the planting process of the ramie and the underground part of the ramie continuously grows so as to circularly harvest the part on the ground. The introduction amount of the earthworms is over 10,000. A repair method provided by the invention can realize the repair for the combined pollution of various heavy metals in the soil. Moreover, the method can maintain the long-term continuous plant in-situ growth repair. The used economic crops also can produce great economic value, cannot generate secondary pollution by the food cycle, achieves the win-win aim of the environmental effect and the economic benefit and is easy to popularize and use.

Description

technical field [0001] The invention relates to the field of environmental pollution and treatment, in particular to a method for remediating soil heavy metal compound pollution. Background technique [0002] Heavy metals and their compounds are well-known "three substances", namely teratogenic, carcinogenic and mutagenic. Under natural conditions, heavy metals in soil will not be degraded by organisms, and their retention time may even exceed one thousand years. Heavy metals, especially cadmium, lead, and zinc are highly toxic, which will inhibit the growth of soil microorganisms, disrupt the ecological balance, and cause soil degradation and insufficient fertility. What's more serious is that about 18.5% of the pollutant content of agricultural products exceeds the health standard. In some vegetables and other crop products in Guangdong Province, the heavy metal content has been detected to exceed the standard, which greatly limits the pollution-free food, green food, Th...

AI Technical Summary

Problems solved by technology

However, at present, these applications are only in the stage of indoor experiments and small-scale field demonstration experiments, as well as the stage of mechanism research, and there is no mature and comprehensive method for remediating the complex pollution of various heavy metals in soil.

Patent 200410027833.3 By planting small flying grass and ramie in the soil, and inoculating metal-activated bacteria, it is found that when the three exist at the same time, the absorption capacity of lead and cadmium in the soil can be improved, but this technology is only for the restoration of soil lead and cadmium , and the operating conditions are relatively harsh, and the implementation is difficult; moreover, when the plants are planted to a certain extent in this technology, it is difficult to maintain a good growth state, and it is difficult to harvest the aboveground part repeatedly, leaving the underground part to continue to grow, so as to continuously carry out Ongoing restoration of in situ growth

[0007] Earthworms have been proven to improve the soil, and some studies have reported that earthworms have a certain enrichment effect on heavy metals. However, because earthworms cannot tolerate high concentrations of heavy metal pollution, the use of earthworms for soil remediation is limited.