A repair system for heavy metal polluted farmland and its application method

Abstract

The invention discloses a heavy metal contaminated farmland remediation system and a using method thereof. The heavy metal contaminated farmland remediation system sequentially comprises an ecologicalremediation area, a permeable reactive wall, an ecological interception zone, an irrigation canal and a farmland from upstream to downstream. First heavy metal hyperaccumulation plants are planted inthe ecological restoration area, a plurality of permeable reaction columns are arranged on the permeable reaction wall, second heavy metal hyperaccumulation plants are planted in the ecological interception zone, the bottom of the irrigation canal is filled with fillers, and a heavy metal passivator and a PH regulator are applied during farmland deep ploughing. Heavy metal irrigation water flowsthrough the remediation system for the heavy metal contaminated farmland, and heavy metal in the heavy metal irrigation water is effectively removed. After heavy metal irrigation water flows through the remediation system for the heavy metal contaminated farmland once, the heavy metal irrigation water can be suitable for irrigation without repeated remediation, time is saved, and the remediation efficiency of the irrigation water is improved.

Description

technical field [0001] The invention relates to the technical field of ecological engineering, in particular to a repair system for farmland polluted by heavy metals and an application method thereof. Background technique [0002] With the massive development and utilization of mineral resources, the rapid development of industrial production and the widespread use of chemical products, pesticides and fertilizers, pollutants containing heavy metals enter the environment through various channels, causing soil, especially farmland soil, to become increasingly polluted with heavy metals. In particular, due to the traditional extensive mining and smelting methods in the mining area, a large amount of heavy metal pollutants enter the soil or flow into the downstream farmland with surface runoff, causing a large amount of soil pollution. At present, heavy metal pollution in my country's farmland shows a trend of extending from mining areas to agricultural areas, and from upstream ...

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Problems solved by technology

[0003] The existing single heavy metal passivation technology cannot remove heavy metals in the soil, nor can it avoid the entry of exogenous heavy metal pollutants; the existing single phytoremediation cycle is long and the efficiency is not high, and it is difficult to achieve heavy metal pollution in a short time Safe use of farmland; even if heavy metal passivation technology and phytoremediation are used in combination at this stage, the removal rate of heavy metals and the restoration efficiency of irrigation water are not significant

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