Ultrasonic remediating method for heavy metal polluted soil/slurry

A heavy metal-contaminated soil and repair method technology, applied in the field of environmental engineering, can solve the problems of high treatment costs, achieve low treatment costs, avoid soil property changes, and be easy to achieve

Inactive Publication Date: 2010-08-25
HOHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Moreover, the leaching method under acid and alkali conditions has very high treatment costs and can only be applied to heavy metal removal projects in a small amount of heavily polluted soil.

Method used

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  • Ultrasonic remediating method for heavy metal polluted soil/slurry
  • Ultrasonic remediating method for heavy metal polluted soil/slurry
  • Ultrasonic remediating method for heavy metal polluted soil/slurry

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] A heavy metal polluted dredging sediment of a reservoir, the content of particles of different particle sizes in the sediment is: the content of particles larger than 74 microns is 63%, the content of particles of 5-74 microns is 23%, and the content of particles smaller than 5 microns is 14% . The contents of copper, zinc, lead, cadmium, chromium, and nickel in the sediment are 290.6mg / kg, 700.0mg / kg, 100.8mg / kg, 1.3mg / kg, 400.0mg / kg, and 162.1mg / kg respectively. Frequency 20kHz, power 1200W, soil water mass ratio 1:15 under the conditions, after ultrasonic action for 20 minutes, use a vibrating sieve with an aperture of 74 microns to get copper, zinc, lead, cadmium, chromium, The removal rate of nickel reaches 90%, and the coarse particles after treatment meet the first-class soil environmental quality standard (GB15618-1995). Add 150mg / L polyacrylamide to the mud under the sieve, let it settle for 24 hours, remove the bottom mud and dehydrate it with a plate and fra...

Embodiment 2

[0026] A kind of heavy metal polluted soil, the content of particles with different particle sizes in the bottom mud is: the content of particles larger than 74 microns is 53%, the content of particles between 5 and 74 microns is 29%, and the content of particles smaller than 5 microns is 18%. The contents of copper, zinc, lead, cadmium, chromium, and nickel in the sediment are 86.7mg / kg, 200.8mg / kg, 46.2mg / kg, 2.0mg / kg, 101.9mg / kg, and 83.3mg / kg respectively. Frequency 25kHz, power 200W, soil water mass ratio under the condition of 1:5, after 90 minutes of ultrasonic action, sieving with a vibrating sieve with an aperture of 74 microns to obtain copper, zinc, lead, cadmium, chromium, The removal rate of nickel reaches 91%, and the coarse particles after treatment meet the first-class soil environmental quality standard (GB15618-1995). Add 50mg / L polyacrylamide to the mud under the sieve, let it settle for 24 hours, remove the bottom mud and dehydrate it with a plate and frame...

Embodiment 3

[0028] A heavy metal polluted pond bottom sludge, the content of particles of different particle sizes in the bottom sludge is: the content of particles larger than 74 microns is 52%, the content of particles between 5 and 74 microns is 33%, and the content of particles smaller than 5 microns is 15%. . The contents of copper, zinc, lead, cadmium, chromium and nickel in the bottom mud are 525.1mg / kg, 351.0mg / kg, 53.8mg / kg, 4.4mg / kg, 357.7mg / kg, 190.4mg / kg respectively. Frequency 30kHz, power 800W, soil-water mass ratio 1:10, through ultrasonic action for 60 minutes, sieve with a vibrating sieve with an aperture of 74 microns to obtain copper, zinc, lead, cadmium, chromium, The removal rate of nickel reaches 92%, and the coarse particles after treatment meet the first-class soil environmental quality standard (GB15618-1995). Add 100mg / L polyacrylamide to the mud under the sieve, let it settle for 24 hours, remove the bottom mud and dehydrate it with a plate and frame filter pre...

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Abstract

The invention discloses an ultrasonic remediating method for heavy metal polluted soil / slurry, which comprises the following steps of: performing ultrasonic cavatition on the slurry so as to scatter soil aggregates and resolve heavy metals combined with soil particles into pore water; after ultrasonic effect is stopped, adsorbing nearly all the heavy metals on the fine particles according to the characteristic that the competitive adsorption capacity of the fine particles is stronger than that of coarse particles; and separating the coarse and fine particles with a vibration sieve so as to obtain clean coarse particles and heavy metal-enriched fine particles, wherein the coarse particles after being simply dehydrated can be used as soil materials; and the fine particles after being subjected to slurry-water separation treatment and then solidification / stabilization treatment can be safely used and sanitarily landfilled. The method is high in treatment efficiency, can treat the soil / slurry by adopting a continuous operation way, and is low in treatment cost. The obtained coarse particle material has good engineering properties; and the obtained a few of fine particle materials containing a large amount of heavy metals can be effectively treated and controlled in pollution by adopting a solidification method.

Description

technical field [0001] The invention relates to an ultrasonic repair method for heavy metal polluted soil / mud, which is suitable for repair projects of heavy metal polluted soil and polluted bottom mud, and belongs to the technical field of environmental engineering. Background technique [0002] The main purpose of heavy metal contaminated soil / mud remediation is to separate heavy metals from contaminated soil. Restoration methods mainly include biological methods, physical methods and chemical methods used alone or in combination. [0003] The commonly used heavy metal bioseparation method is to use animals, plants or microorganisms to enrich heavy metals in organisms and separate them from polluted soil. Such as Chinese Patent No. 200610051958.9, patent name: a method for remediation of heavy metal-contaminated soil, it is proposed to inoculate sulfur-oxidizing bacteria in heavy metal-contaminated soil, and extract heavy metal copper by planting A. haizhou. Another exam...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09C1/00
Inventor 张春雷汪顺才李磊边博
Owner HOHAI UNIV
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