A treatment method for high-concentration heavy metal polluted construction waste

A construction waste and treatment method technology, applied in construction waste recycling, solid waste removal, recycling technology, etc., can solve the problems of secondary pollution, large damage, high cost, etc.

Inactive Publication Date: 2016-01-20
TONGJI UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The method aims at the gap of chemical elution in the field of construction waste pollution remediation polluted by various heavy metals (Cu / Zn / Cr / Ni), and overcomes the limitations of using EDTA, inorganic salts, inorganic acids and organic acids as eluents. The existing elution technology has problems such as high cost, large damage, and easy to produce secondary pollution, so that the heavy metal content of the treated construction waste is lower than the third-level standard threshold of the soil environmental quality standard GB15618-1995 (due to the total amount of heavy metals in construction waste There is no relevant standard in terms of content), and the HJ / T299 leaching method was used to conduct leaching experiments on the treated construction waste, and the concentration of heavy metals in the leachate was lower than the threshold of the hazardous waste standard GB5085.3-2007

Method used

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  • A treatment method for high-concentration heavy metal polluted construction waste
  • A treatment method for high-concentration heavy metal polluted construction waste
  • A treatment method for high-concentration heavy metal polluted construction waste

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Elution and purification treatment of polluted construction waste in electroplating plants

[0029] Take the treatment of construction waste in different workshops of an electroplating factory in Guangdong as an example. The electroplating factory has been in operation for 13 years. At present, the walls and bricks of several conventional workshops are seriously polluted. The construction waste used in this embodiment is the wall concrete blocks and bricks of four different workshops of galvanizing, copper plating, chrome plating and nickel plating. The specific heavy metal concentration of the construction waste after the surface layer is stripped is: galvanizing workshop (Zn) 2122.31mg / kg, copper plating workshop (Cu) 59434.02mg / kg, chrome plating car

[0030] Cr (Cr) 7511.03mg / kg, nickel plating workshop (Ni) 2867.77mg / kg (Table 1.a).

[0031] Proceed as follows:

[0032]In the first step, the surface layer of the concrete blocks and bricks of the wall is stripped...

Embodiment 2

[0050] Elution and purification treatment of polluted construction waste in zinc smelter

[0051] Taking the polluted construction waste of a zinc smelting factory in Yunnan as an example, the electrolysis workshop and cleaning workshop of the factory were seriously polluted by zinc. The Zn contents in the workshop were 49280.00mg / kg and 29738.72mg / kg respectively (Table 2).

[0052] In the first step, the surface layer of the concrete blocks and bricks of the wall is stripped, and the construction waste with high heavy metal content in the surface layer is separated. Use commercially available industrial grade 2-8mo1 / L caustic soda solution (solid-to-liquid volume ratio 1:5) to carry out alkaline leaching of construction waste with high heavy metal content on the surface, and perform electrolytic treatment on the leaching solution to recover metal zinc.

[0053] The second step is the same as in Example 1.

[0054] The third step is to peel off the surface layer, break it, ...

Embodiment 3

[0066] Elution and purification treatment of polluted construction sand and gravel waste after demolition of a factory building

[0067] Taking the polluted concrete sand and gravel waste from a factory building in Shanghai as an example, the sand and gravel waste is mainly polluted by Cu and Zn. After stripping the surface construction waste, the Cu and Zn contents were measured to be 27155.32 mg / kg and 4087.06 mg / kg respectively (Table 3 ).

[0068] Proceed as follows:

[0069] The first step is to peel off the surface layer of concrete sand and gravel to separate the construction waste with high heavy metal content in the surface layer. Use commercially available industrial grade 2-8mo1 / L caustic soda solution (solid-to-liquid volume ratio: 1:5) to carry out alkaline leaching of construction waste with high heavy metal content on the surface, and perform electrolytic treatment on the leaching solution to recover metal zinc.

[0070] Second step, third step are identical w...

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Abstract

The invention relates to a treating method of high-concentration heavy metal polluted building waste. The method includes: stripping surfaces of the building waste, smashing, washing, separating solid and liquid to obtain the cleaned building waste the water-soluble heavy metal of which is removed, adding an isopropylamine glyphosate solution into the cleaned building waste, eluting to remove the heavy metals, adjusting the pH value to be neutral, separating solid and liquid, washing the waste after elution with water and separating solid and liquid. The heavy metal contents in the building waste after air drying are lower than the three-level standard thresholds of the environmental quality standards (GB15618-1995). The building waste after air drying is subjected to a leaching test by utilization of an HJ / T229 leaching method, and the heavy metal contents in the leachate are lower than the thresholds of the standards for hazardous wastes (GB5085.3-2007). The building waste after air drying can be directly buried and stacked without pollution to the soil, and can be used as a regenerated roadbed material and a concrete aggregate. The method is simple in process and capable of completely eliminating the hazard of the polluted building waste, and has good environmental benefit, economic benefit and social benefit.

Description

technical field [0001] A method for treating construction waste polluted by high-concentration heavy metals, which relates to a method for elution and purification of construction waste polluted by various high-concentration heavy metals (Cu / Zn / Cr / Ni), and belongs to the technical field of construction waste treatment, disposal and resource utilization . Background technique [0002] As the largest developing country, China has experienced rapid industrialization and urbanization in the past three decades, and the problem of environmental pollution has become increasingly prominent. Polluting enterprises such as chemical plants and metallurgical plants located in urban areas or suburbs have been relocated one after another. Especially after the severe smog occurred in recent years, the State Council decided to eliminate industries with excess production capacity such as coal chemical industry, steel, and cement, which will generate a large amount of pollution. Construction ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B09B3/00B09B5/00
CPCY02W30/58
Inventor 赵由才高小峰谢田黄晟刘阳罗安然孙艳秋柴晓利牛冬杰
Owner TONGJI UNIV
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