A regulatory agent used for treating soil polluted by heavy metals, a preparation and a using method thereof

Abstract

This invention discloses preparation and application of regulator for repairing soil polluted by heavy metals. The regulator utilizes hydroxyapatite extracted from animal bone as the main raw material, as well as commercialized Si-Ca-Mg Fertilizer at a ratio of 1:(0.5-1). Besides, solutions containing Fe, Zn, Mn, Mo, B, etc., are also added. The regulator comprises: CaO 40-50 wt.%, SiO2 10-20 wt.%, MgO 3-6 wt.%, P2O5 15-30% wt.%, Al2O3 5-10 wt.%, K2O 0.1-0.5 wt.%, Fe2O3 0.1-1.0% wt.%, ZnO 0.3-0.5 wt.%, MnO 0.1-0.5 wt.%, and impurities. Once applied, the regulator is uniformly mixed with soil according to a ratio of 0.05-1.0 wt. % of dry soil. The regulator has such advantages as abundant raw materials, simple process, low cost, good repairing effect, low addition amount, no secondary pollution, no influence on soil structure, and high nutrition, thus can partly replace chemical fertilizers.

Description

technical field [0001] The invention relates to a soil conditioner used in the technical field of soil remediation and its preparation and use method, more specifically to a conditioner used for treating heavy metal polluted soil and its preparation and use method. Background technique [0002] With the rapid development of modern industry and agriculture, a large number of pollutants enter the soil ecosystem through various channels, which makes soil pollution more and more serious. At present, my country's heavy metal-contaminated soil exceeds 300 million mu, accounting for about 1 / 6 of the total cultivated land. The accumulation of harmful heavy metals in the soil to a certain extent will cause toxicity to the soil-plant system, which not only leads to the degradation of land quality, affects the safety of agricultural products, and poses a serious threat to human and animal health through the food chain, but also through runoff and leaching Pollution of surface water an...

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Problems solved by technology

The bone char disclosed in the related patent (a method for utilizing bone char to control lead-contaminated soil, application number 200510006261.5, publication number CN1810398A) utilizes the fixing effect of hydroxyapatite in the bone, but it only has a good effect on soil lead. fixed effect

[0006] At present, there are still some problems in the immobilization and restoration of metal-contaminated soil. For example, due to the complexity of the research objects and the differences in environmental conditions, it is difficult to directly apply the existing technology; the amount of fixative is too large, the cost is high, and it may damage the soil. Quality; it is often only effective for single metals but not outstanding for combined pollution treatment; lack of field test data and lack of understanding of its stability; lack of systematic research on the impact of regulators on soil quality and ecosystems, thus limiting promoted app

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