Unlock instant, AI-driven research and patent intelligence for your innovation.

Normal-temperature desorption-chemical oxidation combined remediation method for high-concentration ammonia nitrogen contaminated soil

A technology for desorption of contaminated soil at room temperature, applied in the field of contaminated soil remediation in industrial sites, can solve the problems of large amount of oxidant, small amount of remediation contaminated soil, inability to meet the remediation requirements of high-concentration ammonia nitrogen contaminated soil, etc., to promote volatilization and improve utilization efficiency. Effect

Inactive Publication Date: 2020-04-07
SUZHOU ZHONGSHENG ENVIRONMENTAL REMEDIATION CO LTD
View PDF2 Cites 3 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although ectopic chemical oxidation can effectively oxidize and decompose organic pollutants in soil, the amount of oxidized and repaired polluted soil in each batch is small and the amount of oxidant needs to be added. Difficulty in soil transportation and storage after restoration
[0004] At present, both room temperature desorption and chemical oxidation technologies have certain defects in the restoration of high-concentration ammonia-nitrogen (the main pollutant is high-concentration ammonium salt) contaminated soil, and cannot meet the remediation requirements of high-concentration ammonia-nitrogen contaminated soil.

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Normal-temperature desorption-chemical oxidation combined remediation method for high-concentration ammonia nitrogen contaminated soil
  • Normal-temperature desorption-chemical oxidation combined remediation method for high-concentration ammonia nitrogen contaminated soil

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] This embodiment provides a combined repair method for normal temperature desorption-chemical oxidation for high-concentration ammonia-nitrogen contaminated soil, including the following steps:

[0021] S1. Dry the polluted soil by natural air drying and control the soil moisture content to below 25%; then sieve and crush the dried soil, and control the particle size of the crushed soil within 10mm;

[0022] S2. Transfer the pretreated soil to the desorption workshop, where there is a mechanical disturbance device, such as a soil turning machine. The desorption workshop has an air inlet, and the top of the desorption workshop has multiple absorption pipes, and the multiple absorption pipes are connected to the external tail gas treatment device after being merged into an adsorption main pipe outside the desorption workshop. exhaust fan. There are multiple nozzles on the top of the desorption workshop, and the multiple nozzles communicate with the external chemical tank ...

Embodiment 2

[0026] This embodiment provides a combined repair method for normal temperature desorption-chemical oxidation for high-concentration ammonia-nitrogen contaminated soil, including the following steps:

[0027] S1. Dry the polluted soil by natural air drying and control the soil moisture content to below 25%; then sieve and crush the dried soil, and control the particle size of the crushed soil within 10mm;

[0028] S2. Transfer the pretreated soil to the desorption workshop, where there is a mechanical disturbance device, such as a soil turning machine. The desorption workshop has an air inlet, and the top of the desorption workshop has multiple absorption pipes, and the multiple absorption pipes are connected to the external tail gas treatment device after being merged into an adsorption main pipe outside the desorption workshop. exhaust fan. There are multiple nozzles on the top of the desorption workshop, and the multiple nozzles communicate with the external chemical tank ...

Embodiment 3

[0032] This embodiment provides a combined repair method for normal temperature desorption-chemical oxidation for high-concentration ammonia-nitrogen contaminated soil, including the following steps:

[0033] S1. Dry the polluted soil by natural air drying and control the soil moisture content to below 25%; then sieve and crush the dried soil, and control the particle size of the crushed soil within 10mm;

[0034] S2. Transfer the pretreated soil to the desorption workshop, where there is a mechanical disturbance device, such as a soil turning machine. The desorption workshop has an air inlet, and the top of the desorption workshop has multiple absorption pipes, and the multiple absorption pipes are connected to the external tail gas treatment device after being merged into an adsorption main pipe outside the desorption workshop. exhaust fan. There are multiple nozzles on the top of the desorption workshop, and the multiple nozzles communicate with the external chemical tank ...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention discloses a normal-temperature desorption-chemical oxidation combined remediation method for high-concentration ammonia nitrogen contaminated soil. The method comprises the following steps: S1, pre-treating contaminated soil, wherein the pre-treating comprises drying, screening and crushing, and the particle size of the crushed soil is controlled at within 10 mm; S2, adding 1-3 wt% of an agent into the pretreated soil, and starting a mechanical disturbance device to fully turn and throw the soil so as to volatilize the ammonia nitrogen pollutants in the soil, wherein the agent comprises 60 to 75 wt% of calcium oxide, 2 to 4.5 wt% of magnesium oxide, 6 to 10 wt% of sodium dihydrogen phosphate, 5 to 8 wt% of citric acid, 3 to 5.5 wt% of diisooctyl sulfosuccinate sodium and 5 to10 wt% of potassium ferrate. According to the contaminated soil treated by the combined remediation method, the total ammonia nitrogen detection amount can meet the environmental quality standard ofsoil for construction land, and the leaching content can also meet the environmental quality standard of underground water.

Description

technical field [0001] The invention relates to the technical field of remediation of polluted soil on industrial sites, in particular to a combined desorption-chemical oxidation remediation method for high-concentration ammonia nitrogen polluted soil. Background technique [0002] Soil organic pollutants refer to organic compounds that enter the soil environment and cause pollution. The industries involved in the discharge of organic pollutants mainly include petrochemical, coking, paint and coating manufacturing, pesticide production, rubber product manufacturing, leather shoe manufacturing, wood-based panels and wooden furniture. Manufacturing, automobile and parts spraying, electronic product manufacturing, steelmaking, cement production, etc., and most of the soil organic pollutants are complex pollutants of volatile and / or semi-volatile organic compounds. These pollutants are constantly migrating and transforming, passing through the respiratory tract, Enter the human ...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): B09C1/00B09C1/08
CPCB09C1/00B09C1/08
Inventor 张砚驰艾金华徐维强
Owner SUZHOU ZHONGSHENG ENVIRONMENTAL REMEDIATION CO LTD