A passivation stabilizer for remediation of cadmium pollution in farmland soil and its preparation method and use method

A stabilizer and cadmium pollution technology, which is applied in the field of farmland cadmium-polluted soil treatment, can solve problems such as eutrophication of surface water bodies, and achieve long-lasting and stable effects, broad application prospects, and long-term and stable passivation effects.

Active Publication Date: 2020-09-08
YANGZHOU UNIV
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Problems solved by technology

[0004] Phosphate is a kind of passivation stabilizer widely used in soil heavy metal pollution. The form of heavy metals in the soil and the solubility of phosphate are important factors affecting the passivation of heavy metal polluted soil by phosphate. The passivation effect of soluble phosphate is better Insoluble phosphate, but the application of soluble phosphate in the soil may cause the risk of eutrophication of surface water

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  • A passivation stabilizer for remediation of cadmium pollution in farmland soil and its preparation method and use method
  • A passivation stabilizer for remediation of cadmium pollution in farmland soil and its preparation method and use method
  • A passivation stabilizer for remediation of cadmium pollution in farmland soil and its preparation method and use method

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Embodiment Construction

[0031] In order to illustrate the technical scheme and technical purpose of the present invention, the present invention will be further introduced below in conjunction with the description of the drawings and specific implementation methods.

[0032] 1 Materials and methods

[0033] 1.1 Experimental design

[0034] A total of 8 treatments were set up in this experiment, as shown in Table 1. Each treatment was repeated three times, and the specific experimental steps were as follows: fully mix the passivation stabilizer and cadmium-contaminated farmland soil, keep the water content of 60% of the soil by weighing method, take samples after cultivating at room temperature for 1 month, air-dry and grind them finely 100 mesh spare. The addition level of passivation stabilizer was 1% of the weight of Cd-contaminated soil. The initial effective cadmium content in Cd-polluted soil was 7.8mg / kg.

[0035] Table 1 passivation stabilizer composition

[0036]

[0037] 1.2 Measurem...

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Abstract

The invention relates to the field of farmland cadmium-contaminated soil treatment, particular to a passivation stabilizer for repairing farmland cadmium-contaminated soil, a preparation method and ause method thereof, wherein the passivation stabilizer comprises, by weight, 35-45% of calcium dihydrogen phosphate, 10-20% of biochar, and 35-45% of a biological bacterial fertilizer. According to the present invention, the passivation stabilizer combines various passivation materials, wherein calcium dihydrogen phosphate and cadmium produce precipiate, biochar has large pores and fixes cadmium through adsorption, and the biological bacterial fertilizer can perform ion adsorption and ion exchange, such that the available content of the cadmium in the soil can be reduced while the organic matter content can be provided for the soil, the pH value of the soil is adjusted, and the redissolution of contaminants is reduced; and through the synergetic effect, the requirements of heavy metal-contaminated soil repairing on strong stability, no secondary pollution and long-lasting and stable effect can be met.

Description

technical field [0001] The invention relates to the field of farmland cadmium-contaminated soil treatment, in particular to a passivation stabilizer for farmland soil cadmium pollution restoration and its preparation method and use method. Background technique [0002] As one of the important resources for human survival, soil safety has always attracted people's attention. However, in recent years, due to the rapid development of industry, the increase of "three wastes" discharge, and the intensification of urban pollution, the problem of heavy metal pollution in soil has become increasingly serious. [0003] The main cause of cadmium pollution in my country's farmland is agricultural sewage irrigation, and the pollution source mainly comes from waste gas and wastewater discharged from factories, smelters, and enterprises. Heavy metal-contaminated soil remediation technologies mainly include physical remediation, chemical remediation, biological remediation, etc. Among them...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K17/40B09C1/08B09C1/10
CPCB09C1/08B09C1/10B09C2101/00C09K17/40
Inventor 王小兵汪晓丽封克陈盾钱娜
Owner YANGZHOU UNIV
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