CN104624635A - Microbial nutrient for repairing chromium-contaminated soil and sediments - Google Patents
Microbial nutrient for repairing chromium-contaminated soil and sediments Download PDFInfo
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- CN104624635A CN104624635A CN201410767421.7A CN201410767421A CN104624635A CN 104624635 A CN104624635 A CN 104624635A CN 201410767421 A CN201410767421 A CN 201410767421A CN 104624635 A CN104624635 A CN 104624635A
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Abstract
The invention relates to a microbial nutrient for repairing chromium-contaminated soil and sediments. The microbial nutrient is prepared from soybean cake powder and molasses in a certain proportion. The microbial nutrient disclosed by the invention is added to the soil or sediments, so that large-scale growth of indigenous microorganisms in the soil or sediments is promoted; poisonous and movable Cr (VI) in the soil or sediments is reduced into low-toxicity Cr (III) which is not prone to move through the reduction effects of the microorganisms; meanwhile, the microorganisms fix trivalent chromium through processes of adsorption, precipitation and the like, so that the mobility and the bio-availability of the trivalent chromium are reduced, and the trivalent chromium is prevented from being re-oxidized into hexavalent chromium. The microbial nutrient has the advantages of being low in cost, good in effect, easily-available in material, convenient to use, environment-friendly, and the like.
Description
Technical field
The present invention relates to a kind of for repairing chromium-polluted soil and sedimental microbial nutrition agent, belonging to environmental technology field.
Background technology
Chromium (Cr) is a kind of metal pollutant common in natural environment, one of front 20 kinds of noxious materials of Ye Shi U.S. super fund priority acccess control.China built up Article 1 chromium salt production line so far from 1958, and successively You70Yu Jia enterprise produced chromic salts, existing 25, and according to the statistics of " chromium slag contaminated comprehensive improvement scheme ", the accumulative chromium quantity of slag that produces of China is about 6,000,000 t.Containing 0.3 ~ 1.5% solubility Cr VI in chromium slag, wash away through precipitation and surface water, enter surrounding soil and underground water, cause the pollution of chromium that environment is serious.Current China reaches 1,250 ten thousand tons by the soil of Cr VI severe contamination, very urgent to the improvement of chromium-polluted soil, is badly in need of the key technology of repairing chromium-polluted soil.
The conventional method of repairing hexavalent chromium polluted soil has chemical fixation, chemical reduction method, soil washing and electro reclamation method etc.And these methods great majority need high energy consumption or need a large amount of chemical reagent, cost is high and easily cause secondary pollution.In recent years, microorganism remediation method receives much concern due to its advantage such as environment friendly and lower cost.Microorganism remediation chromium-polluted soil mainly utilizes the indigenous microorganism in soil or adds the high-effective microorganism through domestication, reacted by micro-reduction, poisonous, moveable Cr (VI) is reduced to low toxicity, the Cr (III) of not easily movement, reach the object of improvement chromium-polluted soil.And apply indigenous microorganism carry out toxic waste removing toxic substances with contaminated soil remediation in environmental safety, environmental suitability and population harmony and application cost, there is the incomparable superiority of other strange land bacterial classifications.But due to the shortage of environment Middle nutrition material, the growth of effective indigenous microorganism is comparatively slow, makes the reparation of chromium-polluted soil be restricted.Therefore, the invention provides a kind of for repairing chromium-polluted soil and sedimental microbial nutrition agent, by for indigenous chromium also pathogenic microorganism nutriment is provided, stimulate it to grow, carry out the reparation of chromium-polluted soil.In addition, the present invention is equally applicable to the sedimental reparation of pollution of chromium.
Summary of the invention
The present invention aims to provide a kind of for repairing chromium-polluted soil and sedimental microbial nutrition agent, is made up of with certain proportioning beancake powder and molasses, and wherein the proportioning of beancake powder and molasses and consumption are determined according to pollution concentration chromic in soil.By adding microbial nutrition agent of the present invention in soil or deposit, promote the raised growth of indigenous microorganism in soil or deposit, utilize the reduction of microorganism poisonous in soil or deposit, moveable Cr (VI) is reduced to low toxicity, the Cr (III) of not easily movement, simultaneously, microbes is by processes such as absorption, precipitations, trivalent chromium is fixed, reduces its mobility and bioavailability, also avoid trivalent chromium to be again oxidized to Cr VI.The present invention has that cost is low, effective, material is easy to get, easy to use, advantages of environment protection.
Molasses are selected in microbial nutrition agent in the present invention, and one is because molasses can increase chromic leaching in soil or deposit; Two is can directly as the electron donor of reduction Cr (VI); Three is carbon sources that molasses also can utilize as microorganism, promotes microbial growth.The carbon-nitrogen ratio about 6.76 of beancake powder, can be microorganism and provides nitrogenous source.The microbial nutrition agent carbon-nitrogen ratio about 15 ~ 40 that molasses and beancake powder form with certain proportioning, is very beneficial for indigenous microorganism to its mineralising, thus promotes the growth of indigenous microorganism, improves chromic reduction stabilisation efficiency.
One provided by the invention is for repairing chromium-polluted soil and sedimental microbial nutrition agent, and its preferred using method is as follows:
Soil or deposit are crushed to diameter and are less than 2mm, add the microbial nutrition agent that molasses and beancake powder form with certain proportioning, stir in soil or deposit, regulate moisture content, isolated air care more than 20 days, both must repair rear soil or deposit.Wherein, in mentioned microorganism nutritional agents, the mass ratio of beancake powder and molasses is 1:2 ~ 10, and the consumption of added microbial nutrition agent is 2% ~ 20% of soil or sediment quality, and moisture control is 25% ~ 40%, and temperature is advisable at 20 DEG C ~ 30 DEG C.
The present invention compared with prior art has following advantages and effect:
1, repairing effect is good: the reduction of microorganism poisonous, moveable Cr (VI) can be reduced to low toxicity, the Cr (III) of not easily movement, simultaneously, microbes is by processes such as absorption, precipitations, trivalent chromium is fixed, reduce its mobility and bioavailability, avoid trivalent chromium to be again oxidized to Cr VI.The present invention can reach more than 96% to clearance chromic in soil or deposit, and total chromium and chromic stabilisation efficiency the minimizing ratio of total chromium or hexavalent chromium concentration (in the leachate) can reach more than 95%, greatly reduce toxicity and harm;
2, cost is low: molasses of the present invention are the accessory substance of sugaring process, and beancake powder is the byproduct after soybean (mainly soya bean and black soya bean) oil expression, wide material sources, cheap;
3, easy to use: the plant equipment that microbial nutrition agent of the present invention in use relates to mainly contains excavator, pulverizer and mixer, easy and simple to handle;
4, environmental friendliness: the present invention is by the effect reduction stabilisation Cr VI of microorganism, avoid the use of chemical reagent, there is environmental safety, in addition, the present invention is by stimulating the growth of indigenous microorganism to work, do not add strange land bacterium, in environmental suitability and population harmony, have more advantage.
Detailed description of the invention
Following examples for illustration of the present invention, but are not used for limiting the scope of the invention.
In embodiment, the analytical method of all samples is as follows: measure soil moisture content according to " determining soil moisture method " (NY/T52-1987), measures soil hexavalent chromium concentration according to " the chromic mensuration alkali of solid waste clears up/atomic absorption spectrophotometry " (HJ687-2014); Leachate is prepared according to " solid waste Leaching leaching method-sulfonitric method " (HJ/T 299-2007), and measure chromic concentration in leachate according to " water quality chromic mensuration diphenyl carbazide spectrophotometry " (GB7467-87), adopt atomic absorption spectrophotometry to measure the concentration of total chromium in leachate.
Embodiment 1
The contaminated soil that the present embodiment is chosen takes from the pollution of surface soil in chemical industry plant area, Jinan City, Shandong Province, and soil air-dry, levigate mistake 100 mesh sieve, stores for future use.After measured, embodiment 1 get contaminated soil fundamental property as table 1, wherein in contaminated soil, chromic concentration is 2655.6mg/kg, and in leachate, total chromium concn is 179.49mg/L, and in leachate, hexavalent chromium concentration is 119.88mg/L.
Table 1 physiochemical properties of soil
| Soil moisture content % | Soil hexavalent chromium concentration (mg/kg) | Total chromium concn (mg/L) in leaching | Hexavalent chromium concentration (mg/L) in leachate |
| 8.27 | 2655.6 | 179.49 | 119.88 |
Get the Plastic Drum that the air-dry chromium-polluted soil of 1kg is placed in 2L, the microbial nutrition agent 150g that interpolation molasses and beancake powder form with certain proportioning, stir, moisture content is regulated to be 38%, isolated air, in 25 DEG C of constant incubators, maintenance 21 days, both must repair rear soil.Wherein, in mentioned microorganism nutritional agents, the mass ratio of beancake powder and molasses is 1:4, and the carbon-nitrogen ratio of microbial nutrition agent is about 23.5:1.
After measured, after repairing, in soil, chromic concentration is 66.82mg/kg, and in soil, chromic clearance reaches 97.48%; In the leachate prepared according to " solid waste Leaching leaching method-sulfonitric method " (HJ/T 299-2007), chromic concentration is not for detect, and the concentration of total chromium is 4.4mg/L, and the stabilisation efficiency of total chromium is 97.55%.
Embodiment 2
In the present embodiment, the contaminated soil type chosen, operating procedure and related assays method are all with embodiment 1, difference is: in added microbial nutrition agent, the mass ratio of beancake powder and molasses is 1:9, and the carbon-nitrogen ratio of microbial nutrition agent is about 36.16:1, regulates moisture content to be 37%.After measured, in the soil after reparation, chromic concentration is 65.43mg/kg, and in soil, chromic clearance reaches 97.54%; In the leachate prepared according to " solid waste Leaching leaching method-sulfonitric method " (HJ/T 299-2007), chromic concentration is not for detect, and the concentration of total chromium is 7.33mg/L, and the stabilisation efficiency of total chromium is 95.91%.
Embodiment 3
The present embodiment chooses the underwater sediment(s) of a foundation ditch in chemical industry plant area, Jinan City, Shandong Province, and air-dry, levigate mistake 100 mesh sieve, stores for future use.After measured, embodiment 3 get sedimental fundamental property as table 2, wherein in deposit, chromic concentration is 126.09mg/kg, and in leachate, total chromium concn is 8.41mg/L, and in leachate, hexavalent chromium concentration is 5.93mg/L.
Table 2 deposit basic physical and chemical
| Moisture content % | Hexavalent chromium concentration (mg/kg) in deposit | Total chromium concn (mg/L) in leaching | Hexavalent chromium concentration (mg/L) in leachate |
| 4.56 | 126.09 | 8.41 | 5.93 |
Get the Plastic Drum that the air-dry pollution of chromium deposit of 1kg is placed in 2L, the microbial nutrition agent 20g that interpolation molasses and beancake powder form with certain proportioning, stir, moisture content is regulated to be 30%, isolated air, in 25 DEG C of constant incubators, maintenance 21 days, both must repair rear deposit.Wherein, in mentioned microorganism nutritional agents, the mass ratio of beancake powder and molasses is 1:4, and the carbon-nitrogen ratio of microbial nutrition agent is about 23.5:1.
After measured, after repairing, in deposit, Cr VI does not detect, in the leachate prepared according to " solid waste Leaching leaching method-sulfonitric method " (HJ/T 299-2007), chromic concentration is not for detect, and the concentration of total chromium is 0.025mg/L, and the stabilisation efficiency of total chromium is 99.7%.
Embodiment 4
In the present embodiment, the marine sediments type chosen, operating procedure and related assays method are all with embodiment 3, and difference is: in added microbial nutrition agent, the mass ratio of beancake powder and molasses is 1:10, and the carbon-nitrogen ratio of microbial nutrition agent is about 38.04:1.After measured, in the deposit after reparation, chromic concentration is 4.08mg/kg, and in soil, chromic clearance reaches 96.77%; In the leachate prepared according to " solid waste Leaching leaching method-sulfonitric method " (HJ/T 299-2007), chromic concentration is not for detect, and the concentration of total chromium is 0.08mg/L, and the stabilisation efficiency of total chromium is 99.05%.
Above-mentioned generality illustrates, embodiment is only explanation technical conceive of the present invention and feature, its object is to allow the personage being familiar with this art can understand content of the present invention and be implemented, can not limit the scope of the invention with this.All amendments of doing according to Spirit Essence of the present invention or improvement, all should be encompassed in protection scope of the present invention.
Claims (4)
1. one kind for repairing chromium-polluted soil and sedimental microbial nutrition agent, it is characterized in that: microbial nutrition agent is made up of with certain proportioning beancake powder and molasses, wherein the proportioning of beancake powder and molasses and consumption are determined according to pollution concentration chromic in soils and sediments.
2. as claimed in claim 1 a kind of for repairing chromium-polluted soil and sedimental microbial nutrition agent, it is characterized in that: using method soil or deposit is crushed to diameter be less than 2mm, the microbial nutrition agent that molasses and beancake powder form with certain proportioning is added in soil or deposit, stir, regulate moisture content, isolated air care more than 20 days, both must repair rear soil or deposit.
3. as claimed in claim 1 a kind of for repairing chromium-polluted soil and sedimental microbial nutrition agent, it is characterized in that: preferred operation parameter is the mass ratio of beancake powder and molasses in described microbial nutrition agent is 1:2 ~ 10, carbon-nitrogen ratio about 15 ~ 40, the consumption of added microbial nutrition agent is 2% ~ 20% of soil or sediment quality, moisture control is 25% ~ 40%, and temperature is advisable at 20 DEG C ~ 30 DEG C.
4. as claimed in claim 1 a kind of for repairing chromium-polluted soil and sedimental microbial nutrition agent, it is characterized in that: molasses are the accessory substance of sugaring process, beancake powder is the byproduct after soybean extract oil.
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Cited By (6)
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| CN104941993A (en) * | 2015-07-22 | 2015-09-30 | 句容市雾起山家庭农场 | Comprehensive remediation method for seriously polluted land |
| CN106607454A (en) * | 2016-12-20 | 2017-05-03 | 平顶山学院 | Remediation method for chrome-polluted soil in coal mine collapse region |
| CN107033914A (en) * | 2017-05-08 | 2017-08-11 | 云南石屏丽然花卉果蔬产业有限公司 | The organic formulations sterilized for obstruction of vegetable continuous cropping sick soil and application |
| CN107486468A (en) * | 2017-08-15 | 2017-12-19 | 北京高能时代环境技术股份有限公司 | One kind is used for hexavalent chromium polluted soil heterotopic repairing method of microorganism |
| CN109013697A (en) * | 2018-07-13 | 2018-12-18 | 北京高能时代环境技术股份有限公司 | A kind of long-acting restorative procedure of severe chromium-polluted soil |
| CN114669591A (en) * | 2022-03-22 | 2022-06-28 | 浙江卓锦环保科技股份有限公司 | Wet detoxification process for hexavalent chromium contaminated soil |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104941993A (en) * | 2015-07-22 | 2015-09-30 | 句容市雾起山家庭农场 | Comprehensive remediation method for seriously polluted land |
| CN106607454A (en) * | 2016-12-20 | 2017-05-03 | 平顶山学院 | Remediation method for chrome-polluted soil in coal mine collapse region |
| CN107033914A (en) * | 2017-05-08 | 2017-08-11 | 云南石屏丽然花卉果蔬产业有限公司 | The organic formulations sterilized for obstruction of vegetable continuous cropping sick soil and application |
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| CN109013697A (en) * | 2018-07-13 | 2018-12-18 | 北京高能时代环境技术股份有限公司 | A kind of long-acting restorative procedure of severe chromium-polluted soil |
| CN114669591A (en) * | 2022-03-22 | 2022-06-28 | 浙江卓锦环保科技股份有限公司 | Wet detoxification process for hexavalent chromium contaminated soil |
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| CN104624635B (en) | 2016-06-08 |
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