Passivating heavy metal contaminated paddy soil conditioner and application thereof
A conditioner and paddy soil technology, which is applied in the field of farmland soil pollution passivation, can solve pollution, reduce the absorption and accumulation of heavy metals, and achieve the effects of alleviating non-point source pollution, reducing the amount of chemical fertilizers used, and prolonging the release period
Inactive Publication Date: 2018-10-09
SOUTH CHINA INST OF ENVIRONMENTAL SCI MEP
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Problems solved by technology
[0005] The technical problem to be solved by the present invention is to overcome the defects of existing soil heavy metal pollution and passivation technology deficiencies, to provide a new conditioner formula, and the conditioner to compound heavy metal (Cd, Cu, Pb, Zn) polluted paddy soil The passivation method improves the heavy metal-contaminated paddy soil through conditioners, reduces the absorption and accumulation of heavy metals by agricultural products, and realizes the efficient, safe and sustainable development of agriculture
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[0017] The present invention will be further described in detail below in conjunction with examples, but the embodiments of the present invention are not limited thereto.
[0018] 1. Formulation of soil heavy metal conditioner
[0019] The formulations of the conditioning agent for passivating soil heavy metals of the present invention are shown in Table 1 (group 1 is the control group) respectively (relative to the treated soil).
[0020]
[0021] Among them, the calcium magnesium phosphate fertilizer is purchased from the market and produced by the Phosphate Fertilizer Factory in Zhongxiang City, Hubei Province. The main component of the calcium magnesium phosphate fertilizer is: Ca 3 (PO 4 ) 2 , CaSiO 3 , MgSiO 3 , which contains Cd 0.02mg / kg, Cu 27.98, Pb 52.30mg / kg, Zn 147.57mg / kg, the shape is blue-gray powder, and the particle size is relatively uniform.
[0022] 2. Conditioning agent passivation method of heavy metal polluted paddy soil
[0023] Mix the passiv...
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The invention discloses a passivating heavy metal contaminated paddy soil conditioner, which is composed of cow dung biochar and calcium magnesium phosphate fertilizer. The conditioner produces an unpredictable synergistic effect, the effect of weakening the effective state of heavy metals in soil and lowering the content of heavy metal in edible parts of crops is far greater than that of the cowmanure biochar or the calcium magnesium phosphate fertilizer alone, the adverse effects of a single inorganic passivator on a soil environment is alleviated, the conditioner has great practical significance for reducing the amount of fertilizer used in farmland soil and alleviating the non-point source pollution of heavy metal on farmland soil. At the same time, biochar can be used as a synergistic carrier of the calcium magnesium phosphate fertilizer, and the calcium magnesium phosphate fertilizer offsets the defect that biochar lacks nutrients. The conditioner has a shorter passivation repairing cycle, can achieve the effect of bioavailable passivation on several heavy metal elements simultaneously, and thus better satisfies the condition for passivation repair of heavy metal contaminated soil.
Description
technical field [0001] The invention belongs to the field of passivation of farmland soil pollution, in particular to a conditioner for passivating heavy metal polluted paddy soil and application thereof. Background technique [0002] Heavy metal pollution in farmland soil has attracted more and more attention because of its relationship to agricultural production, human and animal health. The heavy metal pollution of farmland soil in my country is worrying, but most of the polluted soil is moderately or lightly polluted by heavy metals. If the above-mentioned farmland with low pollution degree and large polluted area stops normal agricultural production and adopts high-input, high-energy-consuming physical and chemical methods for passivation, or adopts low-input, long-term plant passivation methods, this is obviously a unrealistic. Therefore, on the premise of ensuring the safe production of agricultural products and improving the quality of the soil environment, it is a...
Claims
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Login to View More IPC IPC(8): C09K17/06B09C1/08C09K101/00
CPCC09K17/06B09C1/08C09K2101/00
Inventor 黄玲刘冲陈志良张建强苏耀明
Owner SOUTH CHINA INST OF ENVIRONMENTAL SCI MEP