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Iron-sulfur compounded passivation agent applicable to remediation of arsenic-cadmium composite pollution in farmland soil and application of passivation agent

A composite pollution and soil technology, applied in the field of heavy metal pollution remediation in farmland soil, can solve problems such as less research, and achieve the effects of low environmental toxicity, improved chemical utilization efficiency, and improved soil fertility and fertilizer efficiency.

Inactive Publication Date: 2019-08-20
DALIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In recent years, the application of zero-valent iron in soil heavy metal remediation has also increased, but most of the research is related to the removal of Cr(VI), and there are relatively few studies on other heavy metals.

Method used

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  • Iron-sulfur compounded passivation agent applicable to remediation of arsenic-cadmium composite pollution in farmland soil and application of passivation agent
  • Iron-sulfur compounded passivation agent applicable to remediation of arsenic-cadmium composite pollution in farmland soil and application of passivation agent

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Medicament preparation: take 15% sodium thiosulfate pentahydrate, 15% zero-valent iron powder, 5% β-cyclodextrin, 10% sodium lignosulfonate, 5% sodium humate, 10% ammonium bicarbonate, 40 % magnesite burning powder was ground separately and sieved through a 100-mesh sieve, and fully mixed 5 times with a vibrating sieve machine to obtain medicament 1, which was used for laboratory pot experiments.

[0021]The sodium thiosulfate used in the examples is 99% sodium thiosulfate pentahydrate, the zero-valent iron is commercially available 100 mesh zero-valent iron powder, and the purity of β-cyclodextrin is 99%; sodium lignosulfonate is industrial grade, lignin Sulfonate content 45-60%; sodium humate water-soluble humic acid content (dry basis) ≥ 70%; ammonium bicarbonate is food grade; magnesite burning powder contains magnesite 66.7%, calcium oxide 18.6% %. The test soil was collected from a 2-mu farmland in Tangshi Village Farmland Soil Remediation Demonstration Base, Jiy...

Embodiment 2

[0025] Pharmaceutical preparation: take 20% sodium thiosulfate, 5% β-cyclodextrin, 10% sodium lignosulfonate, 5% sodium humate, 15% ammonium bicarbonate, and 45% magnesite burning powder to grind separately And pass through a 100-mesh sieve, and fully mix 5 times with a vibrating sieve machine to obtain medicament 2, which is used for field tests.

[0026] The sodium thiosulfate used in the examples is 99% sodium thiosulfate pentahydrate, the purity of β-cyclodextrin is 99%; sodium lignosulfonate is industrial grade, and the content of lignosulfonate is 45-60%; sodium humate Water-soluble humic acid content (dry basis) ≥ 70%; ammonium bicarbonate is food grade; magnesite burning powder contains 66.7% of magnesium oxide and 18.6% of calcium oxide.

[0027] One week before wheat planting, according to 0.9kg / m 2 Sprinkle medicament 2 evenly in the big field, then use rotary tiller to mix medicament and top layer 20cm soil rotary tillage 3 times. Field management such as fertili...

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Abstract

The invention relates to an iron-sulfur compounded passivation agent applicable to remediation of arsenic-cadmium composite pollution in farmland soil and application of the passivation agent, and belongs to the technical field of farmland soil heavy metal pollution remediation. According to the passivation agent, arsenic and cadmium forms with high bioavailability in soil are extracted from a soil solid into a soil solution by using the complexing capacity of sodium thiosulfate, and then conversion of the sodium thiosulfate in the soil is utilized for fixing the cadmium; and good fixation andcombination effects of compounded zero-valent iron on the arsenic is utilized for fixing the arsenic, so that the arsenic and the cadmium can be repaired and fixed at a same time. In addition, a synergist, a dispersing agent and a adsorption water-retaining material are added, so that utilization efficiency of the reagent is improved, and fertility and fertilizer efficiency of the soil are improved. The sodium thiosulfate and the zero-valent iron powder are both cheap and easily available and have low toxicity to the environment, and sulfur and iron are intermediate products of soil circulation or components for forming the soil, and are also elements required by plant growth. The added auxiliary agents such as the synergist, the dispersing agent, the adsorption water-retaining material and the like all come from the natural environment and are cheap and easily available.

Description

technical field [0001] The invention belongs to the technical field of farmland soil heavy metal pollution restoration, and specifically relates to an iron-sulfur compound passivation agent suitable for repairing arsenic and cadmium composite pollution of farmland soil and its application. Background technique [0002] Affected by human activities such as metal mining and smelting, sewage irrigation, and agricultural production, the problem of heavy metal pollution in farmland soil has become increasingly prominent, and arsenic and cadmium are the two most common elements in farmland soil heavy metal pollution. Zeng Xibo et al. (Chinese Agricultural Sciences, 2007, (11): 2507-2517.) collected and counted research data on heavy metals in Chinese vegetable soils since 1989, and found that the problem of Cd exceeding the standard was prominent, with an exceeding rate of 24.1%, while the rate of arsenic exceeding the standard It also reached 9.2%. In 2011, the results of the an...

Claims

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Application Information

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IPC IPC(8): C09K17/40C09K101/00
CPCC09K17/40C09K2101/00
Inventor 蔡喜运胡灿洋赵宗生於双飞蔡本哲许佳慧
Owner DALIAN UNIV OF TECH
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