Fixative for in situ harnessing heavy metal pollution of soil

An in-situ treatment and heavy metal technology, applied in the field of in-situ remediation of polluted soil, can solve the problems of poor treatment effect of pollution phenomenon, inability to replenish soil nutrients in time, single component of fixative, etc., and achieve stable and reliable preparation process and passivation. Mobility, low cost effect

Inactive Publication Date: 2009-06-03
SHENYANG INST OF APPL ECOLOGY CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The traditional fixed substances mainly use phosphate, lime and biosolids as materials, and the cost is relatively high. In the process of remediation, the remediation effect on soil contaminated by a single heavy metal is more significant, but the effect on the pollution phenomenon associated with several elements is not outstanding.
The traditional fixative has a single component and has poor buffer performance in the soil, and its stability is affected when the soil conditions change
At the same time, soil nutrients cannot be replenished in time during the restoration process.

Method used

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  • Fixative for in situ harnessing heavy metal pollution of soil
  • Fixative for in situ harnessing heavy metal pollution of soil
  • Fixative for in situ harnessing heavy metal pollution of soil

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Naturally burned corn stalk ash is manually sorted to remove residues such as gravel and mixed in a weight ratio of 2:1 (NH 4 ) 2 HPO 4 , according to 2:1 water and soil (lye and straw ash+(NH 4 ) 2 HPO 4 ) weight ratio by adding 0.1M NaOH, its pH = 7.54, stirring for 24 hours, then heat-treating at 90°C to balance, crushing and passing through a 2mm sieve for later use.

[0022] Batch experiment: (detection parameters)

[0023] 1) Adsorption experiment: 50ml of 100ppm cadmium, 1500ppm lead, 2000ppm copper and 2000ppm zinc solution was mixed and oscillated with 1g of different fixed substances for 24 hours, and the adsorption capacity of different substances was determined by measuring the concentration of heavy metal ions in the solution. For the results, see figure 1 Shown, wherein fixative is the fixative product that the embodiment of the present invention 1 makes. Calculated as follows:

[0024] K = 1 - ...

Embodiment 2

[0030] The wheat straw ash of natural incineration is manually sorted to remove residues such as gravel, and mixed in a weight ratio of 5:1 (NH 4 ) 2 HPO 4 , according to the water and soil of 2.5:1 (lye and straw ash+(NH 4 ) 2 HPO 4 ) weight ratio by adding 0.5M Ca(OH) 2 , its pH=8.13, after stirring for 4 hours, it was heat-treated at 80°C to balance, crushed and passed through a 4mm sieve for later use.

Embodiment 3

[0032] The rice straw ash of natural incineration is manually sorted to remove residues such as gravel and the like, and mixed in a weight ratio of 4:1 (NH 4 ) 2 HPO 4 , according to the water and soil of 3:1 (lye and straw ash+(NH 4 ) 2 HPO 4 ) weight ratio by adding 0.05M KOH, its pH = 8.25, stirring for 12 hours and then heat-treating at 98°C to balance, crushing and passing through a 3mm sieve for later use.

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Abstract

The present invention relates to in-situ polluted soil repairing technology, and is especially one kind of fixing agent for in-situ treatment of heavy metal polluted soil. The fixing agent may be preparation through the process of mixing (NH4)2HPO4 and stalk ash in the weight ratio of 1 to 1-5, adding alkali solution to the mixture via stirring to alkalize and regulate pH value to 6-12, heat treatment at 80-100 deg.c to constant weight and crushing to obtain product. The present invention has the advantages of good repair effect, low cost, wide applicable range, high repair efficiency, and capability of replenishing nutrients and fertility to soil.

Description

technical field [0001] The invention relates to an in-situ remediation technology for polluted soil, specifically a fixative for in-situ treatment of heavy metal pollution in soil, using the synthesized chemical substance to in-situ passivate heavy metals in polluted soil and reduce their biological activity in the soil environment. effectiveness. Background technique [0002] When the accumulation of heavy metal elements in the soil reaches a certain amount and exceeds the soil environmental capacity and quality standards, it is easy to cause soil heavy metal pollution. Heavy metal pollutants in soil mainly come from human industrial activities (such as mining, smelting, metal processing, electroplating, leather, etc.) and agricultural activities (such as pesticides, fertilizers, etc.), while some special land use (such as landfills , military bases) also has soil pollution. There is a big difference between heavy metal pollution in soil and organic pollutant pollution. M...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B09C1/08
Inventor 郭观林周启星
Owner SHENYANG INST OF APPL ECOLOGY CHINESE ACAD OF SCI
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