CN104492797A - Remediation method of heavy metal contaminated acidic soil - Google Patents
Remediation method of heavy metal contaminated acidic soil Download PDFInfo
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- CN104492797A CN104492797A CN201410745590.0A CN201410745590A CN104492797A CN 104492797 A CN104492797 A CN 104492797A CN 201410745590 A CN201410745590 A CN 201410745590A CN 104492797 A CN104492797 A CN 104492797A
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Abstract
The invention belongs to the field of soil remediation and discloses a remediation method of heavy metal contaminated acidic soil. The remediation method of heavy metal contaminated acidic soil comprises the following steps: (1) stirring and mixing heavy metal contaminated acidic soil with calcareous soil, and standing the mixed soil for 2 hours; (2) mixing urea phosphate, chitin, biochemical fulvic acid and alginic acid, adding the mixture into the mixed soil, and stirring uniformly; and (3) standing for 3 hours, adding the solution of bacillus and rice bran, and standing. The raw materials adopted by the remediation method are simple, easily available and environment-friendly and can not cause secondary pollution. The remediation method provided by the invention is an environment-friendly method for rapidly and deeply remediating a variety of heavy metal contaminated acidic soil without damaging the biological properties of soil, and the remediation method is suitable for commercial production.
Description
Technical field
The invention belongs to field of environmental technology, relate to a kind of recovery technique of contaminated soil, be specifically related to a kind of restorative procedure of heavy metal pollution acid ground.
Background technology
Along with industrialization and modern fast development, heavy metal pollution of soil causes serious threat to the health of ecological environment and people, becomes one of whole world environmental problem comparing concern.The main source of the pollution of heavy metal-polluted soil is artificial pollution, as sewage irrigation, motor vehicle exhaust emission, sanitary wastewater discharge, three industrial wastes, the using of agriculture chemical.Poison human body in heavy metal and maximum have lead, mercury, arsenic, cadmium, chromium etc. 5 kinds, these heavy metals can not be decomposed in water, and after people is edible, toxicity is amplified, and other toxin in water are combined the larger organic matter of generation toxicity.
The harm of acid ground is a lot, most importantly has a strong impact on the biologically active of soil and the structure of soil, is unfavorable for the growth of plant.In addition, compare at nonacid soil, the relative stability of the heavy metal ion in acid ground biologically active that is poor and heavy metal ion is high, and this makes in acid ground, and the heavy metal pollution that crops and underground water cause is the most serious.
In order to the acid ground of repairing heavy metal pollution, researcher has made effort, as application publication number CN102513349B discloses, a kind of cadmium zinc pollution acid ground is chemically composited fixes-living beings coupled repairing method, use the chemical fixatives of cadmium and zinc to carry out substep respectively to fix, add living beings and strengthen the fixed effect of chemical fixatives and improve soil fertility.Other patents also disclose the method for the Phytoremediation of Soils Contaminated by Heavy Metals adopting non-edible plant.
Summary of the invention
The technical problem solved: for the deficiency of the method for different heavy metal pollution acid grounds, as phytoremediation because the usual root system of plant that phytoremediation is used is flourishing not, can only the soil remediation on top layer be carried out and repairing efficiency is long, and can only carry out assembling in plant to certain heavy metal species; And chemical restoration is owing to easily causing biological property destroy and cause secondary pollution to soil.In order to improve deficiency, the invention provides a kind of restorative procedure of heavy metal pollution acid ground, the method is that one deep layer can repair various heavy and environmental friendliness, to the nondestructive fast method of geobiont character.
Technical scheme: in order to realize above-mentioned purpose of the present invention, the invention discloses a kind of restorative procedure of heavy metal pollution acid ground, and the step of described method comprises as follows:
(1) heavy metal pollution acid ground and calacareous soil are uniformly mixed, leave standstill 2h.
(2) add in mixed soil after a certain amount of urea phosphate, chitin, biochemical fulvic acid and alginic acid being mixed, stir.(3), after leaving standstill 3h, after adding bacillus-rice bran solution, a period of time is left standstill.
Preferably, the restorative procedure of described a kind of heavy metal pollution acid ground, the mass ratio of the heavy metal pollution acid ground described in step (1) and calacareous soil is 1:0.1 ~ 1:0.95.
Preferably, the restorative procedure of described a kind of heavy metal pollution acid ground, the urea phosphate described in step (2) is 25-35 part, chitin is 18-25 weight portion, biochemical fulvic acid is 10-20 weight portion, and alginic acid is 5-15 weight portion.
Preferably, the restorative procedure of described a kind of heavy metal pollution acid ground, in calacareous soil and step (2), the mass ratio of all additive total amounts is 1:0.01 ~ 1:0.1 in step (1).
Preferably, the restorative procedure of described a kind of heavy metal pollution acid ground, in step (3), bacillus is cultivated in advance in rice bran solution.
Further, preferably, the restorative procedure of described a kind of heavy metal pollution acid ground, bacillus is the seed liquor of 1 mL fixed concentration.
Further, preferably, the restorative procedure of described a kind of heavy metal pollution acid ground, rice bran initial concentration solution is 2-35 g/L.
Further, preferably, the restorative procedure of described a kind of heavy metal pollution acid ground, incubation time is 24h ~ 72h.
Preferably, the restorative procedure of described a kind of heavy metal pollution acid ground, after adding bacillus-rice bran solution in step (3), time of repose is 2-7 days.
Beneficial effect: the restorative procedure that the invention provides a kind of heavy metal pollution acid ground, the raw material that the method uses is all simple and easy to get, environmentally safe, secondary pollution can not be caused, that one deep layer can repair various heavy and environmental friendliness, to the nondestructive fast method of geobiont character, be applicable to commercially produce.
Detailed description of the invention
Below the embodiment of the present invention is described in detail, can be easier to make advantages and features of the invention be understood by this technical staff, thus more explicit defining is made to protection scope of the present invention.
Experimental technique described in following embodiment, if no special instructions, is conventional method; Described reagent and material, if no special instructions, all obtain by commercial channel.
Embodiment 1
Under room temperature, first, be that the heavy metal pollution acid ground (mark 1#, pH 4.0) of 1:0.1 leaves standstill 2h with calacareous soil mix and blend in mass ratio; Secondly, urea phosphate, chitin, biochemical fulvic acid and alginic acid mixture is added in mixed soil, the mass ratio of this amount of the mixture and calacareous soil is 1:0.01, wherein the content of added each component of mixing species is respectively: 25 parts of urea phosphates, 18 parts of chitins, 10 parts of biochemical fulvic acids and 5 parts of alginic acids, be uniformly mixed standing 3h; Finally, add the bacillus rice bran solution cultivating 24h in advance, wherein bacillus is the seed liquor of 1mL fixed concentration, and the concentration of rice bran solution is 2 g/L, mixes rear leaving standstill.Leave standstill after 2 days, heavy metal contaminated soil processes, and carries out concentration determination by atomic absorption spectrophotometer to the heavy metal of the leaching of contaminated soil.
Embodiment 2
Under room temperature, first, be that the heavy metal pollution acid ground (mark 1#, PH 4.0) of 1:0.95 leaves standstill 2h with calacareous soil mix and blend in mass ratio; Secondly, urea phosphate, chitin, biochemical fulvic acid and alginic acid mixture is added in mixed soil, the mass ratio of this amount of the mixture and calacareous soil is 1:0.1, wherein the content of added each component of mixing species is respectively: 35 parts of urea phosphates, 25 parts of chitins, 25 parts of biochemical fulvic acids and 15 parts of alginic acids, be uniformly mixed standing 3h; Finally, add the bacillus rice bran solution cultivating 72h in advance, wherein bacillus is the seed liquor of 1mL fixed concentration, and the concentration of rice bran solution is 35 g/L, mixes rear leaving standstill.Leave standstill after 7 days, heavy metal contaminated soil processes, and carries out concentration determination by atomic absorption spectrophotometer to the heavy metal of the leaching of contaminated soil.
Embodiment 3
Under room temperature, first, be that the heavy metal pollution acid ground (mark 1#, PH 4.0) of 1:0.5 leaves standstill 2h with calacareous soil mix and blend in mass ratio; Secondly, urea phosphate, chitin, biochemical fulvic acid and alginic acid mixture is added in mixed soil, the mass ratio of this amount of the mixture and calacareous soil is 1:0.5, wherein the content of added each component of mixing species is respectively: 25 parts of urea phosphates, 15 parts of chitins, 15 parts of biochemical fulvic acids and 10 parts of alginic acids, be uniformly mixed standing 3h; Finally, add the bacillus rice bran solution cultivating 48h in advance, wherein bacillus is the seed liquor of 1mL fixed concentration, and the concentration of rice bran solution is 20 g/L, mixes rear leaving standstill.Leave standstill after 5 days, heavy metal contaminated soil processes, and carries out concentration determination by atomic absorption spectrophotometer to the heavy metal of the leaching of contaminated soil.
Embodiment 4
Under room temperature, first, be that the heavy metal pollution acid ground (mark 2#, PH 4.0) of 1:0.8 leaves standstill 2h with calacareous soil mix and blend in mass ratio; Secondly, urea phosphate, chitin, biochemical fulvic acid and alginic acid mixture is added in mixed soil, the mass ratio of this amount of the mixture and calacareous soil is 1:0.7, wherein the content of added each component of mixing species is respectively: 32 parts of urea phosphates, 18 parts of chitins, 14 parts of biochemical fulvic acids and 15 parts of alginic acids, be uniformly mixed standing 3h; Finally, add the bacillus rice bran solution cultivating 48h in advance, wherein bacillus is the seed liquor of 1mL fixed concentration, and the concentration of rice bran solution is 24 g/L, mixes rear leaving standstill.Leave standstill after 5 days, heavy metal contaminated soil processes, and carries out concentration determination by atomic absorption spectrophotometer to the heavy metal of the leaching of contaminated soil.
Embodiment 5
Under room temperature, first, be that the heavy metal pollution acid ground (mark 3#, PH 4.0) of 1:0.5 leaves standstill 2h with calacareous soil mix and blend in mass ratio; Secondly, urea phosphate, chitin, biochemical fulvic acid and alginic acid mixture is added in mixed soil, the mass ratio of this amount of the mixture and calacareous soil is 1:0.5, wherein, the content of added each component of mixing species is respectively: 25 parts of urea phosphates, 15 parts of chitins, 15 parts of biochemical fulvic acids and 10 parts of alginic acids, be uniformly mixed standing 3h; Finally, add the bacillus rice bran solution cultivating 48h in advance, wherein bacillus is the seed liquor of 1mL fixed concentration, and the concentration of rice bran solution is 20 g/L, mixes rear leaving standstill.Leave standstill after 5 days, heavy metal contaminated soil processes, and carries out concentration determination by atomic absorption spectrophotometer to the heavy metal of the leaching of contaminated soil.
Comparison example 1
Under room temperature, first, be that the heavy metal pollution acid ground (mark 1#, PH 4.0) of 1:0.5 leaves standstill 2h with calacareous soil mix and blend in mass ratio; Secondly, urea phosphate, chitin, biochemical fulvic acid and alginic acid mixture is added in mixed soil, the mass ratio of this amount of the mixture and calacareous soil is 1:0.5, wherein, the content of added each component of mixing species is respectively: 25 parts of urea phosphates, 15 parts of chitins, 15 parts of biochemical fulvic acids and 10 parts of alginic acids, be uniformly mixed standing 3h.Leave standstill after 5 days, heavy metal contaminated soil processes, and carries out concentration determination by atomic absorption spectrophotometer to the heavy metal of the leaching of contaminated soil.
Comparison example 2
Under room temperature, first, be heavy metal pollution acid ground (the mark 1# of 1:0.25 in mass ratio, PH 4.0) with mixed soil in add urea phosphate, chitin, biochemical fulvic acid and alginic acid mixture, wherein the content of added each component of mixing species is respectively: 25 parts of urea phosphates, 15 parts of chitins, 15 parts of biochemical fulvic acids and 10 parts of alginic acids, be uniformly mixed standing 3h; Secondly, add the bacillus rice bran solution cultivating 48h in advance, wherein bacillus is the seed liquor of 1mL fixed concentration, and the concentration of rice bran solution is 20 g/L, mixes rear leaving standstill; Leave standstill after 5 days, heavy metal contaminated soil processes, and carries out concentration determination by atomic absorption spectrophotometer to the heavy metal of the leaching of contaminated soil.
Comparison example 3
Under room temperature, first, be that the heavy metal pollution acid ground (mark 1#, PH 4.0) of 1:0.5 leaves standstill 2h with calacareous soil mix and blend in mass ratio; Secondly, add the bacillus rice bran solution cultivating 48h in advance, wherein bacillus is the seed liquor of 1mL fixed concentration, and the concentration of rice bran solution is 20 g/L, mixes rear leaving standstill.Leave standstill after 5 days, heavy metal contaminated soil processes, and carries out concentration determination by atomic absorption spectrophotometer to the heavy metal of the leaching of contaminated soil.
The heavy metal initial content of table one three kinds of contaminated soils
| Project | Cadmium (Cd) | Chromium (Cr) | Plumbous (Pb) |
| Soil (mark 1#) | 9.8 mg/kg | 342.4 mg/kg | 420.6 mg/kg |
| Soil (mark 2#) | 15.5 mg/kg | 467.3 mg/kg | 572.3 mg/kg |
| Soil (mark 3#) | 23.9 mg/kg | 530.8 mg/kg | 654.8 mg/kg |
The content that in table two example 1-5, after repair process, heavy metal is final
| Project | Soil is numbered | Cadmium (Cd) | Chromium (Cr) | Plumbous (Pb) |
| Example 1 | Soil (mark 1#) | 0.3 mg/kg | 16.7 mg/kg | 13.2 mg/kg |
| Example 2 | Soil (mark 1#) | 0.2 mg/kg | 8.4 mg/kg | 6.9 mg/kg |
| Example 3 | Soil (mark 1#) | 0.1 mg/kg | 10.8 mg/kg | 9.3 mg/kg |
| Example 4 | Soil (mark 2#) | 0.4 mg/kg | 13.1 mg/kg | 11.5 mg/kg |
| Example 5 | Soil (mark 3#) | 0.6 mg/kg | 19.8 mg/kg | 14.7 mg/kg |
The content that after repair process in table three comparison example 1-3, heavy metal is final
| Project | Cadmium (Cd) | Chromium (Cr) | Plumbous (Pb) |
| Comparison example 1 | 6.5 mg/kg | 176.7 mg/kg | 144.9 mg/kg |
| Comparison example 2 | 4.8 mg/kg | 132.5 mg/kg | 121.6 mg/kg |
| Comparison example 3 | 5.7 mg/kg | 184.3 mg/kg | 207.8 mg/kg |
From table one and table two result, the heavy metal pollution acid ground restorative procedure heavy metal cadmium, chromium and the lead that used are all effective, and the soil of heavy metal content cadmium (≤23.9 mg/kg), chromium (≤530.8 mg/kg) and lead (≤654.8 mg/kg) can obtain good repairing effect.From the comparison example of table three, in method used in the present invention: the lime soil in step (1), urea phosphate in step (2), chitin, biochemical fulvic acid and alginic acid mixture, and the bacillus rice bran solution in step (3), three is all indispensable, there is cooperative effect between three, collaborate completes the reparation to acid ground heavy metal.
Claims (9)
1. a restorative procedure for heavy metal pollution acid ground, is characterized in that described method step comprises as follows:
(1) heavy metal pollution acid ground and calacareous soil are uniformly mixed, leave standstill 2h;
(2) add in mixed soil after urea phosphate, chitin, biochemical fulvic acid and alginic acid being mixed, stir;
(3), after leaving standstill 3h, bacillus-rice bran solution left standstill is added.
2. the restorative procedure of a kind of heavy metal pollution acid ground according to claim 1, is characterized in that, the mass ratio of the heavy metal pollution acid ground described in step (1) and calacareous soil is 1:0.1 ~ 1:0.95.
3. the restorative procedure of a kind of heavy metal pollution acid ground according to claim 1, it is characterized in that, urea phosphate described in step (2) is 25-35 weight portion, chitin is 18-25 weight portion, biochemical fulvic acid is 10-20 weight portion, and alginic acid is 5-15 weight portion.
4. the restorative procedure of a kind of heavy metal pollution acid ground according to claim 1, is characterized in that, in calacareous soil and step (2), the mass ratio of all additive total amounts is 1:0.05 ~ 1:1.4 in step (1).
5. the restorative procedure of a kind of heavy metal pollution acid ground according to claim 1, is characterized in that, in step (3), bacillus is cultivated in advance in rice bran solution.
6. the restorative procedure of a kind of heavy metal pollution acid ground according to claim 5, is characterized in that, bacillus is the seed liquor of 1 mL fixed concentration.
7. the restorative procedure of a kind of heavy metal pollution acid ground according to claim 5, is characterized in that, rice bran initial concentration solution is 2-35 g/L.
8. the restorative procedure of a kind of heavy metal pollution acid ground of bud according to claim 5, is characterized in that, incubation time is 24h ~ 72h.
9. the restorative procedure of a kind of heavy metal pollution acid ground according to claim 1, is characterized in that, after adding bacillus-rice bran solution in step (3), time of repose is 2-7 days.
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| CN107088576A (en) * | 2016-02-17 | 2017-08-25 | 北京飞鹰绿地科技发展有限公司 | It is a kind of to be used to improve the method for acid soil |
| CN107880899A (en) * | 2017-11-15 | 2018-04-06 | 吴梅丽 | The renovation agent of a kind of acid soil and heavy-metal contaminated soil and its preparation |
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