CN101811133A - Ultrasonic remediating method for heavy metal polluted soil/slurry - Google Patents
Ultrasonic remediating method for heavy metal polluted soil/slurry Download PDFInfo
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- CN101811133A CN101811133A CN 201010158828 CN201010158828A CN101811133A CN 101811133 A CN101811133 A CN 101811133A CN 201010158828 CN201010158828 CN 201010158828 CN 201010158828 A CN201010158828 A CN 201010158828A CN 101811133 A CN101811133 A CN 101811133A
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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
The present invention relates to a kind of ultrasonic remediating method of heavy metal polluted soil/slurry, be applicable to the recovery project of heavy-metal contaminated soil and polluted bed mud, belong to field of environment engineering technology.
Background technology
The main purpose of heavy metal polluted soil/slurry reparation is that the heavy metal that pollutes in the soil is separated.The method of repairing mainly contains the independent of biological method, physical method and chemical method or unites use.
Heavy metal biological separation method commonly used be utilize animal, plant or microorganism with heavy metal accumulation in organism and from pollute soil, separate.As China Patent No. 200610051958.9, proprietary term: propose in heavy-metal contaminated soil, to inoculate earlier sulfur oxidizing bacterium in a kind of restorative procedure of heavy-metal contaminated soil, extract heavy metal copper with the method for plantation elsholtzia splendens.China Patent No. 200410027833.3 for another example, patent name: propose in a kind of plant restoration method of heavy metal pollution of soil in containing the soil of heavy metal, to plant Thymifoious Euphorbia Herb, or inoculate the method for heavy metallic activation bacterium on this basis, realize efficiently concentrating plumbous in the heavy-metal contaminated soil, cadmium.Heavy metal biological separation method long processing period (decades even go up century-old), efficient are lower, and treating capacity is limited, is not suitable for the processing of a large amount of polluted soil/slurries.
Heavy metal physics commonly used, Chemical Decomposition method are according to ion-exchange, covalency precipitation, chelating, and perhaps electric principle is separated the form that becomes soluble state or be easy to separate with particle from pollute soil in conjunction with the heavy metal of attitude.As ELUTION METHOD commonly used, under hydrodynamism or acid/alkali condition, heavy metal is become soluble state and remove, again leacheate is carried out water treatment.This method needs the certain cost of cost to carry out water treatment owing under acidity or alkali condition, not only make drip washing be acid or alkaline, also is acid or alkaline for the soil particle after the drip washing, can't directly utilize and safe disposal.As Chinese invention patent numbers 200810011864.8, patent name: leacheate of a kind of repairing polluted soil and preparation method thereof, employing be to stir the leacheate that forms by sulfonation Thiacalixarene, NaOH and water, be alkaline; Chinese invention patent numbers 200810198393.6 for another example, patent name: a kind of chemical leaching and restorative procedure thereof that is used for removing simultaneously heavy metal in soil and arsenic, employing be to mix the acid eluent that forms by EDTA, ammoniacal liquor and oxalic acid.And acid, the ELUTION METHOD under the alkali condition, disposal cost is very high, and the heavy metal that can only be applied to a small amount of heavily contaminated soil is removed engineering.
Summary of the invention
The present invention is directed in the prior art, heavy metal is the existence of absorption bonding state with soil particle and is difficult to separate, and traditional acidity or alkaline ELUTION METHOD are unfavorable for the characteristics of subsequent treatment and utilization to the change of washing water and soil nature matter, a kind of ultrasonic remediating method of heavy metal polluted soil/slurry is provided, it adopts ultrasonic wave that certain density mud is carried out ultrasonic cavitation, so that the mass of soil grain is broken up, and the heavy metal that will combine with soil particle is resolved in the pore water, after treating that ultrasonication stops, be better than coarse grained characteristics according to fine grain competitive Adsorption ability, heavy metal all can be adsorbed onto on the fine grained basically, adopt the vibration sieve to carry out slightly again, fine grain separation, thereby obtain the clean coarse granule and the fine grained of enriching heavy metal, coarse granule uses through just can be used as soil material after the simple dehydration, and for the fine grained mud of enriching heavy metal, through being cured processing again after the mud-water separation processing, can carry out safe utilization or sanitary landfills, the present invention can carry out under neutrallty condition, need not under acid or alkaline condition, to act on, neither can change the character of the aqueous solution, also can not change the character of soil or mud, be a kind of method of being free from side effects fully.Treatment effeciency height of the present invention, can adopt the mode of working continuously to handle, processing cost is low, can obtain the good Coarse Aggregate of engineering properties after the processing, and utilizes curing also can access effective processing and pollution control for the fine granules of a small amount of high content of beary metal.
For realizing above technical purpose, the present invention will take following technical scheme:
A kind of ultrasonic restorative procedure of heavy metal polluted soil/slurry may further comprise the steps: sizing mixing of (1) heavy metal polluted soil/slurry adds the water modulation with heavy metal polluted soil/slurry, is 3～10 mud with acquisition water and soil mass ratio; (2) ultrasonication is that 20～30kHz, ultrasonic power are to act on 10min～4h under the condition of 100～2000W with the mud that obtains in the step (1) in supersonic frequency; (3) the thickness separation adopts the vibration sieve that the mud through ultrasonication is carried out wet screening, with coarse-grained soil on the sieve that obtains purification respectively and the screenings that is rich in heavy metal, coarse-grained soil satisfies one-level soil environment quality standard on the described sieve, can directly carry out recycling; (4) mud-water separation is carried out mud-water separation with the mud screenings in the step (3), to obtain fine grained soil and tail water; (5) pollute the curing of fine grained soil and the purification of tail water and adopt curing agent to be cured polluting fine grained soil, to obtain high-intensity firming body, heavy metal after treatment is closed in the firming body; Tail water so that pollutant is broken away from from water, makes tail water reach discharge standard by water treatment steps.
Further, the described ultrasonication of above-mentioned steps (2) adopts slot type or probe type ultrasonic equipment to carry out.
Further, the sieve of vibration described in the above-mentioned steps (3) aperture is 74 microns.
Further, the described mud-water separation of above-mentioned steps (4) comprises successively mud is flocculated, concentrates and processed.
Further, the described curing agent of above-mentioned steps (5) is cement, lime, flyash, waste gypsum or blast-furnace cinder.
Further, contained heavy metal comprises one or more blending ingredients in copper, zinc, lead, cadmium, chromium and the nickel in the described heavy metal polluted soil/slurry.
According to above technical scheme, can realize following beneficial effect:
(1) ultrasonic wave is auxiliary transfers to heavy metal on the fine grained soil, has realized the enrichment of heavy metal in fine grained soil, can obtain clean coarse granule and directly carry out recycling;
(2) the present invention directly handles under neutrallty condition, does not need to add acid or alkali as traditional drip washing a difficult problem of having avoided wastewater treatment and soil nature to change;
(3) separate the fine grained and the tail water that contain heavy metal under the sieve of back for thickness and carry out special disposal respectively, realize easily technically;
(4) processing cost of the present invention is low, efficient is high, can work continuously, and meets the requirement of environmental protection and resource regeneration.
Description of drawings
Fig. 1 is the flow chart of the ultrasonic restorative procedure of heavy metal polluted soil/slurry of the present invention.
The specific embodiment
Accompanying drawing discloses a kind of technical scheme of the present invention without limitation, and table 1 has disclosed each related parameter of the embodiment of the invention, explains the technical scheme of embodiment involved in the present invention below with reference to accompanying drawing and table 1.
Table 1
Embodiment 1
A kind of reservoir heavy metal pollution dredging bed mud, the content of different-grain diameter particle is in the bed mud: greater than 74 microns granule contents is that 63%, 5～74 micron granule content is 23%, is 14% less than 5 microns granule contents.The content of copper, zinc, lead, cadmium, chromium, nickel is respectively 290.6mg/kg, 700.0mg/kg, 100.8mg/kg, 1.3mg/kg, 400.0mg/kg, 162.1mg/kg in the bed mud, at supersonic frequency 20kHz, power 1200W, under the condition of soil water quality than 1: 15, through ultrasonication 20 minutes, with the aperture is that the clearance that 74 microns vibration sieve screening obtains sieving copper on the coarse granule, zinc, lead, cadmium, chromium, nickel reaches 90%, and coarse granule satisfies one-level soil environment quality standard (GB15618-1995) after treatment.Mud under the sieve adds the polyacrylamide of 150mg/L, through staticly settling 24 hours, taking off portion's bed mud dewaters with plate and frame type filter-press, add " Mixed Type Silt Solidification Material (ZL03113373.8) " 50kg in the every cubic metre of mud in dehydration back and be cured processing, 28 days unconfined compressive strengths of solidified earth are 50kPa.The water conservancy that supernatant that staticly settles and plate and frame type filter-press press filtration go out satisfies sewage comprehensive discharge secondary standard (GB8978-1996) after with active carbon adsorption.
Embodiment 2
A kind of heavy-metal contaminated soil, the content of different-grain diameter particle is in the bed mud: greater than 74 microns granule contents is that 53%, 5～74 micron granule content is: 29%, be 18% less than 5 microns granule contents.The content of copper, zinc, lead, cadmium, chromium, nickel is respectively 86.7mg/kg, 200.8mg/kg, 46.2mg/kg, 2.0mg/kg, 101.9mg/kg, 83.3mg/kg in the bed mud, at supersonic frequency 25kHz, power 200W, under the condition of soil water quality than 1: 5, through ultrasonication 90 minutes, with the aperture is that the clearance that 74 microns vibration sieve screening obtains sieving copper on the coarse granule, zinc, lead, cadmium, chromium, nickel reaches 91%, and coarse granule satisfies one-level soil environment quality standard (GB15618-1995) after treatment.Mud under the sieve adds the polyacrylamide of 50mg/L, through staticly settling 24 hours, taking off portion's bed mud dewaters with plate and frame type filter-press, add " Mixed Type Silt Solidification Material (ZL03113373.8) " 75kg in the every cubic metre of mud in dehydration back and be cured processing, 28 days unconfined compressive strengths of solidified earth are 100kPa.The water conservancy that supernatant that staticly settles and plate and frame type filter-press press filtration go out satisfies sewage comprehensive discharge secondary standard (GB8978-1996) after with active carbon adsorption.
Embodiment 3
A kind of heavy metal pollution sediment of pond, the content of different-grain diameter particle is in the bed mud: greater than 74 microns granule contents is that 52%, 5～74 micron granule content is: 33%, be 15% less than 5 microns granule contents.The content of copper, zinc, lead, cadmium, chromium, nickel is respectively 525.1mg/kg, 351.0mg/kg, 53.8mg/kg, 4.4mg/kg, 357.7mg/kg, 190.4mg/kg in the bed mud, at supersonic frequency 30kHz, power 800W, under the condition of soil water quality than 1: 10, through ultrasonication 60 minutes, with the aperture is that the clearance that 74 microns vibration sieve screening obtains sieving copper on the coarse granule, zinc, lead, cadmium, chromium, nickel reaches 92%, and coarse granule satisfies one-level soil environment quality standard (GB15618-1995) after treatment.Mud under the sieve adds the polyacrylamide of 100mg/L, through staticly settling 24 hours, taking off portion's bed mud dewaters with plate and frame type filter-press, add " Mixed Type Silt Solidification Material (ZL03113373.8) " 80kg in the every cubic metre of mud in dehydration back and be cured processing, 28 days unconfined compressive strengths of solidified earth are 120kPa.The water conservancy that supernatant that staticly settles and plate and frame type filter-press press filtration go out satisfies sewage comprehensive discharge secondary standard (GB8978-1996) after with active carbon adsorption.
Claims (6)
1. the ultrasonic restorative procedure of a heavy metal polluted soil/slurry is characterized in that, may further comprise the steps:
(1) sizing mixing of heavy metal polluted soil/slurry adds the water modulation with heavy metal polluted soil/slurry, is 3～10 mud with acquisition water and soil mass ratio;
(2) ultrasonication is that 20～30kHz, ultrasonic power are to act on 10min～4h under the condition of 100～2000W with the mud that obtains in the step (1) in supersonic frequency;
(3) the thickness separation adopts the vibration sieve that the mud through ultrasonication is carried out wet screening, and with coarse-grained soil on the sieve that obtains purification respectively and the screenings that contains heavy metal, coarse-grained soil satisfies one-level soil environment quality standard on the sieve;
(4) mud-water separation is carried out mud-water separation with the screenings in the step (3), to obtain fine grained soil and tail water;
(5) pollute the curing of fine grained soil and the purification of tail water and adopt curing agent to be cured polluting fine grained soil, to obtain high-intensity firming body, heavy metal after treatment is closed in the firming body, satisfies safe utilization and health is buried the demand of filling out; Tail water so that pollutant is broken away from from water, makes tail water reach discharge standard by water treatment steps.
2. according to the ultrasonic restorative procedure of the described heavy metal polluted soil/slurry of claim 1, it is characterized in that the described ultrasonication of step (2) adopts slot type or probe type ultrasonic equipment to carry out.
3. according to the ultrasonic restorative procedure of the described heavy metal polluted soil/slurry of claim 1, it is characterized in that the sieve of vibration described in the step (3) aperture is 74 microns.
4. according to the ultrasonic restorative procedure of the described heavy metal polluted soil/slurry of claim 1, it is characterized in that the described mud-water separation of step (4) comprises successively to be flocculated, concentrate and processed mud.
5. according to the ultrasonic restorative procedure of the described heavy metal polluted soil/slurry of claim 1, it is characterized in that the described curing agent of step (5) is one or more the blending ingredients in cement, lime, flyash, waste gypsum or the blast-furnace cinder.
6. according to the ultrasonic restorative procedure of the described heavy metal polluted soil/slurry of claim 1, it is characterized in that contained heavy metal comprises one or more the blending ingredients in copper, zinc, lead, cadmium, chromium and the nickel in the described heavy metal polluted soil/slurry.
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Cited By (20)
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| CN102172605A (en) * | 2010-12-29 | 2011-09-07 | 中国海洋大学 | Technique for purifying heavy oil-contaminated soil by acoustochemical method |
| CN102535180A (en) * | 2012-02-11 | 2012-07-04 | 东华大学 | Method utilizing ultrasonic for size mixing |
| CN102718440A (en) * | 2011-03-29 | 2012-10-10 | 鞍钢股份有限公司 | Modified cement solidification body with blast furnace slag and method for treating chromium slag thereof |
| CN102849911A (en) * | 2012-10-18 | 2013-01-02 | 黑龙江省科学院火山与矿泉研究所 | Method for passivating and repairing cadmium-polluted volcano barrier lake bottom mud |
| CN102989741A (en) * | 2012-11-20 | 2013-03-27 | 盐城工学院 | Preparation method of heavy metal solid waste curing agent |
| CN103084385A (en) * | 2013-01-28 | 2013-05-08 | 韩清洁 | Repairation method of chromium-polluted soil and corresponding equipment thereof |
| CN103601316A (en) * | 2013-11-13 | 2014-02-26 | 沈阳大学 | Harmless treatment method for contaminated soil eluate |
| CN103739118A (en) * | 2014-01-06 | 2014-04-23 | 博天环境集团股份有限公司 | Treatment method for analyzing waste liquid |
| CN104056854A (en) * | 2014-06-25 | 2014-09-24 | 湖南新九方科技有限公司 | United stable mineralizing repairing agent for treating soil with combined pollution of Pb, As, Cu, and Cd and application method of repairing agent |
| CN106396314A (en) * | 2016-11-30 | 2017-02-15 | 河海大学 | Method using ultrasonic to assist nanoscale zero-valence iron to remedy soil or sludge polluted by heavy metals |
| CN106563692A (en) * | 2015-10-08 | 2017-04-19 | 韩国地质资源研究院 | Method of restoring heavy-metal-contaminated soil |
| CN106746395A (en) * | 2016-11-30 | 2017-05-31 | 河海大学 | The method and its special purpose device of nano zero valence iron removal Heavy Metals in Sludge |
| CN106964642A (en) * | 2017-05-27 | 2017-07-21 | 山东师范大学 | A kind of intensified by ultrasonic wave oxidation elution combined remediation method in pollution of chromium place |
| CN109647869A (en) * | 2018-11-20 | 2019-04-19 | 江西洁地环境治理生态科技有限公司 | Quickly reduce the method for serious pollution heavy metal content in soil |
| CN109794502A (en) * | 2018-12-03 | 2019-05-24 | 北京高能时代环境技术股份有限公司 | A kind of method of Sonication assisted treatment containing chromium slag soil |
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| CN102172605A (en) * | 2010-12-29 | 2011-09-07 | 中国海洋大学 | Technique for purifying heavy oil-contaminated soil by acoustochemical method |
| CN102718440B (en) * | 2011-03-29 | 2014-09-03 | 鞍钢股份有限公司 | Modified cement solidification body with blast furnace slag and method for treating chromium slag thereof |
| CN102718440A (en) * | 2011-03-29 | 2012-10-10 | 鞍钢股份有限公司 | Modified cement solidification body with blast furnace slag and method for treating chromium slag thereof |
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| CN102989741B (en) * | 2012-11-20 | 2015-05-27 | 盐城工学院 | Preparation method of heavy metal solid waste curing agent |
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| CN103601316A (en) * | 2013-11-13 | 2014-02-26 | 沈阳大学 | Harmless treatment method for contaminated soil eluate |
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| CN103739118B (en) * | 2014-01-06 | 2016-01-20 | 博天环境集团股份有限公司 | The treatment process of analysis |
| CN104056854A (en) * | 2014-06-25 | 2014-09-24 | 湖南新九方科技有限公司 | United stable mineralizing repairing agent for treating soil with combined pollution of Pb, As, Cu, and Cd and application method of repairing agent |
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| CN106563692A (en) * | 2015-10-08 | 2017-04-19 | 韩国地质资源研究院 | Method of restoring heavy-metal-contaminated soil |
| CN106396314A (en) * | 2016-11-30 | 2017-02-15 | 河海大学 | Method using ultrasonic to assist nanoscale zero-valence iron to remedy soil or sludge polluted by heavy metals |
| CN106746395A (en) * | 2016-11-30 | 2017-05-31 | 河海大学 | The method and its special purpose device of nano zero valence iron removal Heavy Metals in Sludge |
| CN106964642A (en) * | 2017-05-27 | 2017-07-21 | 山东师范大学 | A kind of intensified by ultrasonic wave oxidation elution combined remediation method in pollution of chromium place |
| CN109647869A (en) * | 2018-11-20 | 2019-04-19 | 江西洁地环境治理生态科技有限公司 | Quickly reduce the method for serious pollution heavy metal content in soil |
| CN109647869B (en) * | 2018-11-20 | 2021-09-03 | 江西洁地环境治理生态科技有限公司 | Method for rapidly reducing heavy metal content in heavily polluted soil |
| CN109794502A (en) * | 2018-12-03 | 2019-05-24 | 北京高能时代环境技术股份有限公司 | A kind of method of Sonication assisted treatment containing chromium slag soil |
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| CN112642853A (en) * | 2020-12-03 | 2021-04-13 | 浙江大学 | Device and method for treating heavy metal polluted soil by combining electric remediation and solidification |
| CN113575006A (en) * | 2021-06-25 | 2021-11-02 | 塔里木大学 | Method for leaching farmland salinity by using ultrasonic wave reinforced brackish water |
| CN116003102A (en) * | 2022-12-02 | 2023-04-25 | 浙江省生态环境科学设计研究院 | Method for preparing sintered brick by using heavy metal contaminated soil |
| CN116003102B (en) * | 2022-12-02 | 2024-01-09 | 浙江省生态环境科学设计研究院 | Method for preparing sintered brick by using heavy metal contaminated soil |
| CN116855254A (en) * | 2023-07-03 | 2023-10-10 | 江苏莘野生物科技有限公司 | Long-acting controllable acid soil conditioner and preparation method thereof |
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Application publication date: 20100825 |