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Method for treating and reducing heavy metal toxicity in soil by mixing decoration rubbish and soil

A mixed treatment and heavy metal technology, applied in the field of solid waste resource utilization and soil remediation, can solve the problems of long phytoremediation cycle, less engineering application, additional carbon emissions, etc. easy-to-get effect

Active Publication Date: 2019-01-18
SHANGHAI MUNICIPAL ENG DESIGN INST GRP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among them, the application of curing / stabilizing agents will generate a large amount of additional carbon emissions and secondary pollution problems, while the phytoremediation cycle is longer and engineering applications are less

Method used

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  • Method for treating and reducing heavy metal toxicity in soil by mixing decoration rubbish and soil
  • Method for treating and reducing heavy metal toxicity in soil by mixing decoration rubbish and soil
  • Method for treating and reducing heavy metal toxicity in soil by mixing decoration rubbish and soil

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] Take mixed decoration waste from a certain place in Shanghai, sieve out the large debris, and use a jaw crusher to crush it. According to construction aggregate: wood / chips: cardboard / chips: mortar: bentonite: quartz sand = 3:2:1: Prepare a mixed decoration waste system in a ratio of 3:1:1, and lead (Pb), trivalent chromium (Cr III), cadmium (Cd), copper (Cu), and zinc (Zn) to simulate heavy metal polluted soil according to the decoration waste: Mix the soil at a weight ratio of 1:2, fill the obtained mixed solid waste into a polytetrafluoroethylene column, add anaerobic water until it is about 5cm above the surface of the waste, cover it and let it stand. A total of 4 cans were set up as a batch experiment for comparison. At the same time, a blank control was set up, and clean soil was added to the polluted soil to simulate the polluted soil-decoration garbage mixed system.

[0041] The measured concentrations of pollutants in the simulated polluted soil are listed in...

Embodiment 2

[0046] Using the mixed decoration waste system in Example 1, mixed with the contaminated soil obtained from a polluted site in Yangpu District according to the decoration waste: soil weight ratio of 1:2, wherein the contaminated soil was tested, and the heavy metals contained in it were mainly antimony, chromium, copper, Lead, Nickel and Zinc. The mixed solid waste obtained by mixing is filled into a polytetrafluoroethylene column, and oxygen-free water is added to cover the surface of the waste by about 7-8cm, and it is airtight and left standing. A total of 4 cans were set up as a batch experiment for comparison. At the same time, a blank control was set up, and clean soil was added to the polluted soil to simulate the polluted soil-decoration garbage mixed system.

[0047]On the 3rd day, the 7th day, the 15th day and the 28th day of the reaction, one tank was selected for sampling, and the total concentration of heavy metals in the solid-liquid system was determined. Tabl...

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Abstract

The invention discloses a method for treating and reducing heavy metal toxicity in soil by mixing decoration rubbish and soil and belongs to the technical field of solid waste recycling and soil remediation. The method comprises the following steps: simply pre-treating mixed decoration rubbish by breaking, screening, and the like, wherein the decoration rubbish comprises 2-4 parts of aggregates, 1-3 parts of wood dust, 1-2 parts of paperboard dust, 2-4 parts of mortar, 1-2 parts of bentonite and 1-2 parts of quartz sand; mixing the decoration rubbish with soil at a certain mass ratio and thenfilling into a polytetrafluoroethylene column; adding anaerobic water till being 3-5cm higher than the solid surface, and then standing by and reacting for 28d. According to the invention, most heavymetal pollutants, which are likely to damage human body and environment, can be removed from soil. The method disclosed by the invention is a green and low-cost method for remediating polluted soil byrecycling abandoned construction waste; raw materials are easily acquired; process is simple; remediating effect is excellent; no capacity-increasing problem exists.

Description

technical field [0001] The invention belongs to the technical field of solid waste resource utilization and soil remediation, and in particular relates to a method for reducing the toxicity of heavy metals in soil by using decoration garbage-soil mixed treatment. Background technique [0002] With the continuous advancement of my country's industrialization and urbanization process, a large number of traditional industrial lands are facing elimination and demolition, but long-term industrial production behaviors have caused huge damage to enterprises and their surrounding land. Soil pollution is different from other pollutions in that it has a certain degree of concealment, hysteresis, accumulation and irreversibility, so that this problem has only been paid attention to by domestic scholars and managers in recent years. Heavy metals are important pollutants that cause soil pollution, among which mercury (Hg), cadmium (Cd), chromium (Cr), lead (Pb) and metalloid arsenic (As)...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09C1/08B09C1/00
CPCB09C1/00B09C1/08
Inventor 黄晟张辰谭学军朱煜孙瑞殷瑶
Owner SHANGHAI MUNICIPAL ENG DESIGN INST GRP
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