Heavy metal contaminated soil remediation method and system with water hyacinths

Abstract

The invention discloses a heavy metal contaminated soil remediation method and system with water hyacinths. The method comprises the steps as follows: firstly, a remediation pond is built, wherein a cobblestone layer, a bottom coarse sand layer, a heavy metal contaminated soil layer and a top coarse sand layer are laid in the remediation pond from bottom to top in sequence; secondly, water hyacinth plants are planted in the top coarse sand layer; thirdly, tap water flows into the remediation pond to fill up the cobblestone layer, the bottom coarse sand layer, the heavy metal contaminated soil layer and the top coarse sand layer upwards in sequence; fourthly, sampling is performed from a sampling opening regularly for analysis, and indicators of heavy metal of each layer are monitored to judge whether the indicators of the heavy metal of the heavy metal contaminated soil layer reach the standard; fifthly, the liquid level condition is observed for timely water supplementation, and excessive water hyacinths are harvested regularly depending on the growth condition of water hyacinths; sixthly, the fourth step and the fifth step are repeated till the indicators of the heavy metal of the heavy metal contaminated soil layer reach the standard to complete remediation. The method and the system can effectively reach the heavy metal remediation target of the soil.

Description

technical field [0001] The invention relates to the fields of remediation of heavy metal-contaminated soil and resource utilization of water hyacinth, in particular to a water hyacinth remediation method and system for remediation of heavy metal-contaminated soil. Background technique [0002] With the increase of population and the development of social economy, human disturbance to the soil environment is increasing day by day, and the soil ecosystem has been destroyed unprecedentedly. In particular, the situation of soil heavy metal pollution through mining, application of heavy metal pesticides and chemical fertilizers is severe. Heavy gold elements in soil are easy to accumulate, cannot be decomposed by soil microorganisms, and can be enriched through the food chain and eventually endanger human health. Studies have shown that in my country, soil heavy metal pollution reduces grain production by more than 10 million tons every year, and the cumulative economic loss rea...

AI Technical Summary

Problems solved by technology

However, most aquatic plants are mainly used in the remediation of heavy metal pollution in wetlands and water environments, and have no direct application in soil heavy metal remediation. Soil heavy metal remediation has become a difficult problem.

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