CN102503274B - Curing agent for heavy-metal polluted bottom sludge - Google Patents
Curing agent for heavy-metal polluted bottom sludge Download PDFInfo
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- CN102503274B CN102503274B CN 201110342103 CN201110342103A CN102503274B CN 102503274 B CN102503274 B CN 102503274B CN 201110342103 CN201110342103 CN 201110342103 CN 201110342103 A CN201110342103 A CN 201110342103A CN 102503274 B CN102503274 B CN 102503274B
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Abstract
The invention discloses a curing agent for heavy-metal polluted bottom sludge. The curing agent comprises the following components by mass fraction: 20%-50% of cement, 40%-70% of coal ash, 5%-15% of bentonite and 3%-6% of additionally added agent. After the bottom sludge is treated by the curing agent, the strength of a cured object is high, and the pH of leaching agent and the leaching concentration of heavy metal are greatly reduced.
Description
Technical field
The present invention relates to a kind of treatment agent that can be cured mud and bed mud, relate in particular to a kind of heavy metal pollution bottle sediment curing agent.
Background technology
Along with the industrial or agricultural rapid economy development, the discharging of industry " three wastes " and domestic garbage make heavy metal contaminants be deposited in the bed mud in river and enrichment gradually through complicated physics, chemistry, biology and deposition process.The heavy metal of including in the bed mud may be discharged when envrionment conditions changes again, and the heavy metal concentration of water body is raise, and tangible secondary pollution occurs.In China, many rivers or bottom mud in lake are subjected to heavy metal contamination in various degree.Because heavy metal content surpasses Hazardous wastes judging standard value in the mud, may be to the great potential threat of environment structure, also possible harmful to human and other biological body.Therefore, it is very necessary the heavy metal contamination bed mud in river to be carried out safe disposal.
The curing/stabilizing technology of cement is present inorganic pollutant the most widely used technology during especially heavy metal is handled, but heavy metal Zn, Cu, Pb have certain inhibition to the hydration reaction of cement in the bed mud, cause that cement consumption is big, intensity is low, solidify the back porosity than problems such as height.Simultaneously a large amount of mixing of cement make leach liquor pH too high, when contacting with surface water and groundwater, the water quality in the ecosystem are worked the mischief.
Chinese patent literature CN101921090A discloses the technology of utilizing flyash instead of part cement solidification bed mud, the solidification effect that utilizes flyash instead of part cement solidification bed mud is good when adopting plain cement to make solidifying agent, but still have that cement consumption is big, cured body leach liquor pH and solidify the back increase-volume than problems such as pozzolanic activity higher, flyash are difficult to excite, and when low cement addition, cured body ultimate compression strength is too low, even does not reach the required minimum requirements of security landfill.
Wilkinite is owing to have very strong water-absorbent and ion adsorption capacity, and it is stable to help in the mud heavy metal.Concrete admixture is a kind of compound chemical building material, and a large amount of engineering practices prove, mix an amount of admixture in concrete, can improve concrete performance, improves concrete strength, saves advantages such as the cement and the energy.But wilkinite and concrete admixture are used for the auxiliary curing heavy metal polluted bed mud of cement-flyash system not to appear in the newspapers.
Summary of the invention
Technical problem to be solved by this invention is: at the deficiencies in the prior art, provide that a kind of cement mixing content is low, curing/stabilizing is satisfactory for result, can greatly reduce the heavy metal bed mud curing agent that bed mud cured body heavy metal leaches concentration.
For solving the problems of the technologies described above, the present invention by the following technical solutions:
A kind of heavy metal pollution bottle sediment curing agent, described solidifying agent comprises the component of following massfraction:
Cement 20%～50%;
Flyash 40%～70%;
Wilkinite 5%～15%; With
Admixture 3%～6%.
In the above-mentioned solidifying agent, preferably, described admixture comprises nitrocalcite, Sodium Nitrite, sodium metaaluminate, sodium sulfate, sodium lignosulfonate, sodium lauryl sulphate and trolamine.
In the above-mentioned solidifying agent, the massfraction of each component of described admixture is preferably: nitrocalcite 10%～30%, Sodium Nitrite 10%～30%, sodium metaaluminate 10%～30%, sodium sulfate 20%～50%, sodium lignosulfonate 1%～5%, sodium lauryl sulphate 1%～5%, trolamine 0.5%～5%.
Solidifying agent of the present invention can reduce cement consumption owing to added admixture, reduces cost; Promote hydrated cementitious, improve intensity, density, the impermeability of cured body, improve the cured body internal structure; Excite the activity of flyash, quicken the hydration process of flyash.
Compared with prior art, advantage of the present invention is: solidifying agent material of the present invention is cheap and easy to get, the cement addition is lower when handling heavy metal polluted bed mud, with respect to only adopting cement and flyash to solidify, the ultimate compression strength of cured body was higher when this solidifying agent was handled heavy metal polluted bed mud, leach liquor pH and heavy metal leach concentration largely to be reduced, and counterweight stabilized metal better effects if, can satisfy the related request of national standard (GB16889-2008).
Embodiment
Embodiment:
Solidifying agent at the bottom of one group of (three kinds) heavy metal contamination mud of the present invention, every kind of solidifying agent includes cement, flyash, wilkinite and admixture, in the present embodiment, cement in every kind of solidifying agent is selected 325 ordinary Portland cements for use, flyash is low calcium II level flyash, wilkinite is a sodium bentonite, admixture is that mass ratio is 5: 5: 5: 10: 0.5: 0.75: 0.25 nitrocalcite, Sodium Nitrite, sodium aluminate, sodium sulfate, sodium lignosulfonate, sodium lauryl sulphate and trolamine, the consumption of each component of solidifying agent saw Table 1.
Organize as a comparison case with three kinds of solidifying agent that do not contain admixture, the consumption of each component sees Table 1, with six kinds of solidifying agent and 1000g heavy metal polluted bed mud (is former bed mud, its essential property sees Table 2) mix, maintenance for some time under the normal temperature, test ultimate compression strength and heavy metal leaching concentration respectively through maintenance after fixing body (at the bottom of the former mud through solidifying agent solidify back).
Testing method is unconfined compression strength: test specimen is 100mm * 100mm * 100mm square, vibrations compaction moulding, maintenance 7d and 28d under the room temperature; Heavy metal leaches concentration: toxicity characteristic leaching procedure adopts HJ/T 300-2007 (solid waste leaches toxicity leaching method hac buffer method), by liquid-solid ratio is that 20: 1 (L/kg) adds sodium acetate vat liquor (pH=4.93 ± 0.05), and 18 ± 2h final vacuum that vibrates in rotating speed is the convertible oscillation device of 30 ± 2r/min filters.
Test result sees Table 3, as shown in Table 3, during maintenance 7d, the ultimate compression strength of the cured body of group number 1,2,3 (solidifying agent of the present invention solidifies former bed mud) is respectively 0.83,1.19,3.12MPa, and Comparative Examples group C1, C2, C3 only are 0.11,0.14,0.55MPa; C1, the heavy metal Cd of C2 cured body, Pb leaches concentration even does not reach household refuse landfill sites and pollutes control mark (GB16889-2008) (household refuse landfill sites pollutes control criterion and sees Table 4), and the cured body leaching concentration of mixing admixture all can reach requirement, maintenance during to 28d ultimate compression strength all increase to some extent, Cd, the leaching concentration of Pb further reduces, as seen, the ultimate compression strength height of cured body when the solidifying agent of present embodiment is handled heavy metal polluted bed mud, leach liquor pH and heavy metal leach concentration largely to be reduced, and counterweight stabilized metal better effects if can satisfy the related request of national standard (GB16889-2008).
Table 1: hardener formula among the embodiment and consumption
| Group number | Bed mud (g) | Cement (g) | Flyash (g) | Wilkinite (g) | Admixture (g) |
| 1 | 1000 | 100 | 300 | 30 | 20 |
| 2 | 1000 | 150 | 400 | 90 | 25 |
| 3 | 1000 | 200 | 200 | 30 | 25 |
| C1 | 1000 | 100 | 300 | 30 | - |
| C2 | 1000 | 150 | 400 | 90 | - |
| C3 | 1000 | 200 | 200 | 30 | - |
Table 2: the essential property at the bottom of the former mud
Table 3: the ultimate compression strength of cured body and heavy metal leach the test result of concentration
Table 4: household refuse landfill sites pollutes control criterion (GB 16889-2008)
| Cu(mg·L -1) | Cd(mg·L -1) | Pb(mg·L -1) |
| 40 | 0.15 | 0.25 |
Claims (1)
1. a heavy metal pollution bottle sediment curing agent is characterized in that, described solidifying agent comprises the component of following massfraction:
Cement 20%～50%;
Flyash 40%～70%;
Wilkinite 5%～15%; With
Admixture 3%～6%;
Described admixture comprises nitrocalcite, Sodium Nitrite, sodium metaaluminate, sodium sulfate, sodium lignosulfonate, sodium lauryl sulphate and trolamine;
The massfraction of each component of described admixture is: nitrocalcite 10%～30%, Sodium Nitrite 10%～30%, sodium metaaluminate 10%～30%, sodium sulfate 20%～50%, sodium lignosulfonate 1%～5%, sodium lauryl sulphate 1%～5%, trolamine 0.5%～5%.
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| Application Number | Priority Date | Filing Date | Title |
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| CN 201110342103 CN102503274B (en) | 2011-11-03 | 2011-11-03 | Curing agent for heavy-metal polluted bottom sludge |
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| Application Number | Priority Date | Filing Date | Title |
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| CN 201110342103 CN102503274B (en) | 2011-11-03 | 2011-11-03 | Curing agent for heavy-metal polluted bottom sludge |
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| CN102503274A CN102503274A (en) | 2012-06-20 |
| CN102503274B true CN102503274B (en) | 2013-07-24 |
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| CN104418560B (en) * | 2013-08-20 | 2017-01-18 | 深圳市铁汉生态环境股份有限公司 | Curing agent for treating heavy metal pollution and heavy metal curing method |
| CN103881727B (en) * | 2014-03-12 | 2016-03-23 | 江苏维尔利环保科技股份有限公司 | The stabilizing and curing agent of remediating heavy metal and toxic organic compound combined contamination soil and using method thereof |
| CN103934261B (en) * | 2014-04-22 | 2015-08-19 | 浙江大学 | A kind of method of the ground antiseepage of Polluted Soil working area and sclerosis in site remediation |
| CN104478058B (en) * | 2014-11-04 | 2016-03-30 | 沈礼群 | A kind of Gou Tang lake heavy metal agriculture chemical pollutes solidification remover and preparation method thereof |
| CN105217925B (en) * | 2015-10-12 | 2018-05-01 | 北京高能时代环境技术股份有限公司 | A kind of sludge in-situ curing and stabilized curing agent and its preparation method and application |
| CN105967470B (en) * | 2016-05-12 | 2019-06-11 | 江西洁地环境治理生态科技有限公司 | A kind of cadmium copper lead contamination bed mud curing agent and its curing method |
| CN105967351A (en) * | 2016-07-13 | 2016-09-28 | 安徽国能亿盛环保科技有限公司 | Wastewater treating agent for steel smelting and preparation method thereof |
| CN106477835B (en) * | 2016-12-02 | 2019-08-06 | 华中师范大学 | A kind of modified barrier of the in-situ chemical of high pollution bed mud and application |
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| CN107010811A (en) * | 2017-04-28 | 2017-08-04 | 余思哲 | A kind of method of dredging silt fast dewatering |
| CN107473684B (en) * | 2017-09-11 | 2020-05-05 | 广州中科地化环保工程有限公司 | Environment-friendly river bottom mud treatment agent |
| CN107973562B (en) * | 2017-12-04 | 2020-05-12 | 中科绿洲（北京）生态工程技术有限公司 | Bottom mud in-situ curing and repairing agent and preparation method thereof |
| CN112794591A (en) * | 2021-03-23 | 2021-05-14 | 深圳瑞新达新能源科技有限公司 | Composite sludge curing agent |
| CN113683227A (en) * | 2021-09-14 | 2021-11-23 | 湖南天为环保科技有限公司 | Activating agent for strengthening high-concentration landfill leachate membrane concentrated solution solidified body and application thereof |
| CN116283054A (en) * | 2023-03-29 | 2023-06-23 | 国能神东煤炭集团有限责任公司 | Gangue heavy metal curing agent and preparation method and use method thereof |
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| CN101265070A (en) * | 2008-04-17 | 2008-09-17 | 高康 | Sludge solidifying agent and application thereof |
| JP5966242B2 (en) * | 2009-07-08 | 2016-08-10 | 東ソー株式会社 | Heavy metal treating agent and method for treating heavy metal contaminants |
| CN101638311A (en) * | 2009-07-10 | 2010-02-03 | 北京古华建业淤泥固化科技有限公司 | Slit and sludge curing agent |
| CN101921090B (en) * | 2010-08-03 | 2013-03-20 | 湖南大学 | Heavy metal pollution bottle sediment curing agent and curing method thereof |
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