CN104475443A - Acid phosphate stabilization reparation method of lead contaminated soil - Google Patents
Acid phosphate stabilization reparation method of lead contaminated soil Download PDFInfo
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- CN104475443A CN104475443A CN201410672066.5A CN201410672066A CN104475443A CN 104475443 A CN104475443 A CN 104475443A CN 201410672066 A CN201410672066 A CN 201410672066A CN 104475443 A CN104475443 A CN 104475443A
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Abstract
The invention discloses an acid phosphate stabilization reparation method of lead contaminated soil. The acid phosphate stabilization reparation method is characterized by comprising the following steps: adding a sodium phosphate and phosphoric acid mixed solution into lead contaminated soil, stirring uniformly, and then maintaining. According to the invention, after stabilization treatment, the lead content of leachate in the lead contaminated soil is less than the lead content concentration limit value 0.25mg/L in standard for pollution control on the landfill site of municipal solid waste. The stabilization treatment time only needs 3 days, and the cycle is short; the reason for the short stabilization treatment time by using the acid phosphate solution is that a hydrogen ion can promote lead at the weak acid state to be dissolved, and moreover, a phosphate anion and a lead ion can generate lead phosphate precipitate which is insoluble in water.
Description
Technical field
The present invention relates to a kind of restorative procedure of lead-contaminated soil, the method for the particularly salt-stabilized reparation of a kind of lead-contaminated soil acid phosphatase.
Background technology
Along with socioeconomic development, environmental problem causes people more and more to pay close attention to, and heavy metal contaminants enters soil by all means, and wherein lead is one of modal soil pollution heavy metal.Cause the main cause of Lead Pollution in Soil can ascribe fire coal, industrial lead, vehicle exhaust, mining and smelting etc. to.After Lead In Soil enters human body by food chain or breathing, health presents the symptoms such as Nausea and vomiting, constipation, diarrhoea; Its severe person also presents hepatopathy, peripheral nerve disease, hemolytic anemia etc.Lead is the nonessential element of plant, when producing certain toxic action to plant behind it and plant contact, gently then makes process of the writing disorder in plant, grows and be suppressed, heavy then cause Plant death.Reducing the validity of Lead In Soil by stabilisation is the first-selected approach that lead-contaminated soil is repaired, and the phosphate medicament that to be stabilization effect best.
It is generally acknowledged, the lead phosphate class precipitation of slightly solubility add phosphate in lead-contaminated soil after, can be formed.This kind of precipitation water-soluble extremely low, thus effectively can reduce the Available Lead in soil.The main mechanism of phosphate to lead-contaminated soil reparation comprises Environmental Chemistry and Physiology and biochemistry two kinds of mechanism: the former is mainly due to Pb in soil
2+directly by Phosphate Adsorption and PO
4 3-the indirectly-acting absorption of induction, and Pb
2+with the PO in the soil liquid
4 3-form calcium phosphate precipitation etc.; The latter mainly refers to Pb
2+formed with phosphorus containg substances in plant cell wall and vacuole and precipitate, thus reduce the xylem long distance delivery of lead ion in plant.Research shows, not only efficiency is low to add separately phosphate solution stabilization processes lead-contaminated soil, and it is partially long to expend the cycle.
CN102416403A discloses a kind of hydrochloric acid and potassium dihydrogen phosphate combines the lead stablized in calcareous lead-contaminated soil, add hydrochloric acid and potassium dihydrogen phosphate in calcareous lead-contaminated soil simultaneously, the effect significantly reducing validity plumbous in calcareous lead-contaminated soil can be played, the method is long for curing cycle, the effect of complete stability Lead In Soil can not be reached, before and after stable, in soil extract, lead content is also before treatment about 20%.DeGrain.The requirement of maximum concentration limit value 0.25mg/L in " household refuse landfill sites Environmental capacity standard " can not be met.
Summary of the invention
For existing problem, the object of the present invention is to provide a kind for the treatment of cycle short, the effective salt-stabilized restorative procedure of lead-contaminated soil acid phosphatase.
To achieve these goals, technical scheme of the present invention is: the method for the salt-stabilized reparation of a kind of lead-contaminated soil acid phosphatase, is characterized in that: comprise the steps: in the soil of lead contamination, adds sodium phosphate and phosphoric acid mixed solution, stir, then maintenance.
Preferred as such scheme: concrete steps are: take lead-contaminated soil, measure lead tolerance, then take excessive sodium phosphate, sodium phosphate being dissolved in mass fraction is in the phosphoric acid solution of 5% ~ 20%, stir, every 100g soil needs phosphoric acid solution 5-15ml.
Above-mentioned sodium phosphate and phosphoric acid solution are evenly sprayed on lead-contaminated soil, stir, make the pH of soil be less than 5; Adjustment soil moisture content is 18%-23%, keeps this moisture content, maintenance 3 days under room temperature.
As further preferred: the amount of described sodium phosphate is the 5%-9% of lead-contaminated soil quality.
As further preferred: lead-contaminated soil lead content being about to 1000mg/kg, adds the sodium phosphate of soil quality mark 5-7%, and it is the phosphoric acid solution of 8.0% ~ 13% that every 100g soil adds 5 ~ 11mL mass fraction;
Lead content is about to the lead-contaminated soil of 3000mg/kg, adds the sodium phosphate of soil quality mark 6-8%, it is the phosphoric acid solution of 10% ~ 15% that every 100g soil adds 7 ~ 13mL mass fraction;
Lead content is about to the lead-contaminated soil of 6000mg/kg, adds the sodium phosphate of soil quality mark 7-9%, it is the phosphoric acid solution of 13% ~ 18% that every 100g soil adds 8 ~ 14mL mass fraction;
Lead content is about to the lead-contaminated soil of 9000mg/kg, adds the sodium phosphate of soil quality mark 9-11%, every 100g soil add 9 ~ 15mL mass fraction be 15% ~ 20% phosphoric acid solution.
The preparation of leachate and test after stabilization processes: the preparation containing lead-contaminated soil leachate of stabilization processes is carried out in strict accordance with " solid waste Leaching leaching method acetate buffer solution method " HJ/T 300-2007.And wherein the lead tolerance of leachate adopts the test of atom graphite furnace absorption process.
In the present invention, the process of acid phosphatase salting liquid Absorbable organic halogens is containing the Available Lead in lead-contaminated soil.
The invention has the beneficial effects as follows: 1, contain the lead tolerance of leachate in lead-contaminated soil after stabilization processes all lower than lead tolerance concentration limit 0.25mg/L in " household refuse landfill sites Environmental capacity standard ".
2, the stabilization processes time of the present invention only needs 3d, and the cycle is short.Superphosphate solution-stabilizedization processing time short reason is that hydrogen ion can promote the dissolving of weak acid form lead, in addition, phosphate anion can and lead ion generation be insoluble in the lead phosphate sediment of water.
Detailed description of the invention
Below in conjunction with specific embodiment, the present invention will be further described:
Embodiment 1
Original soil leachate lead tolerance: according to " solid waste Leaching leaching method acetate buffer solution method " HJ/T 300-2007 method, lead content is that the lead tolerance of the contaminated soil leachate of 1000mg/kg, 3000mg/kg, 6000mg/kg and 9000mg/kg is respectively 51.8mg/L, 81.9mg/L, 161.6mg/L and 278.9 mg/L.
Embodiment 2
1000mg/kg soil stabilization process: take five parts, the soil that 100g lead concentration is about 1000mg/kg; Respectively the phosphate of 2.0% of soil quality, 3.0%, 3.5%, 4.0%, 5.0%, 6.0% and 7.0% being dissolved in 10mL mass fraction is in the phosphoric acid liquid of 10%; The mixed solution of above-mentioned preparation is evenly sprayed onto in soil, stir, the pH of soil is made to be less than 5, adjustment soil moisture content is 18%-23%, keep this moisture content, after room temperature maintenance 3d, testing soil leachate lead tolerance is respectively 1.762mg/L, 0.8926mg/L, 0.6614mg/L, 0.4651mg/L, 0.2187mg/L, 0.1867mg/L and 0.1534mg/L.The experiment wherein adding the sodium phosphate of 5.0-7.0% to meet in leachate lead content lower than the requirement of 0.25mg/L.
Embodiment 3
3000mg/kg soil stabilization process: take five parts, the soil that 100g lead concentration is about 3000mg/kg; Respectively the sodium phosphate of 3.0% of soil quality, 4.0%, 4.5%, 5.0%, 6.0%, 7.0% and 8.0% being dissolved in 10mL mass fraction is in the phosphoric acid solution of 13%; The mixed solution of above-mentioned preparation is evenly sprayed onto in soil, stir, the pH of soil is made to be less than 5, stir, regulate soil moisture content to be 18%-23%, keep this moisture content, after room temperature maintenance 3d, testing soil leachate lead tolerance is respectively 1.861mg/L, 1.131mg/L, 0.6272mg/L, 0.4211mg/L, 0.2294mg/L, 0.1876mg/L and 0.1438mg/L.The experiment wherein adding the sodium phosphate of 6.0-8.0% to meet in leachate lead content lower than the requirement of 0.25mg/L.
Embodiment 4
Measuring lead content is the process of 6000mg/kg soil stabilization: take five parts, the soil that 100g lead concentration is about 6000mg/kg; Respectively the sodium phosphate of 4.0% of soil quality, 5.0%, 6.0%, 7.0%, 8.0% and 9.0% being dissolved in 12mL mass fraction is in the phosphoric acid solution of 15%; The mixed solution of above-mentioned preparation is evenly sprayed onto in soil, stir, the pH of soil is made to be less than 5, stir, regulate soil moisture content to be 18%-23%, keep this moisture content, after room temperature maintenance 3d, testing soil leachate lead tolerance is respectively 1.621mg/L, 1.028mg/L, 0.6915mg/L, 0.2342mg/L, 0.1976mg/L and 0.1639mg/L.The experiment wherein adding the sodium phosphate of 7.0-9.0% to meet in leachate lead content lower than the requirement of 0.25mg/L.
Embodiment 5
Measuring lead content is the process of 9000mg/kg soil stabilization: take five parts, the soil that 100g lead concentration is about 9000mg/kg; Respectively the sodium phosphate of 5.0% of soil quality, 6.0%, 7.0%, 8.0%, 9.0%, 10.0% and 11.0% being dissolved in 14mL mass fraction is in the phosphoric acid solution of 18%; The mixed solution of above-mentioned preparation is evenly sprayed onto in soil, stir, the pH of soil is made to be less than 5, stir, regulate soil moisture content to be 18%-23%, keep this moisture content, after room temperature maintenance 3d, in testing soil leachate, lead tolerance is respectively 1.396mg/L, 1.013mg/L, 0.5843mg/L, 0.3553mg/L, 0.2281mg/L, 0.1862mg/L and 0.1675mg/L.The experiment wherein adding the sodium phosphate of 9.0-11.0% to meet in leachate lead content lower than the requirement of 0.25mg/L.
More than describe preferred embodiment of the present invention in detail.But be not limited to above-described embodiment, as being about the lead-contaminated soil of 1000mg/kg for lead content, add sodium phosphate to select between soil quality mark 5-7%, the phosphoric acid solution concentration of adding can be selected between 8-13%, and the amount of the phosphoric acid solution that every 100g soil adds is selected between 5 ~ 11mL.
Lead content is about to the lead-contaminated soil of 3000mg/kg, adding sodium phosphate can select between soil quality mark 6-8%, and the phosphoric acid solution concentration of interpolation can be selected between 10-15%, and the amount that every 100g soil adds phosphoric acid is selected between 7 ~ 13mL.
Lead content is about to the lead-contaminated soil of 6000mg/kg, adding sodium phosphate can select between soil quality mark 7-9%, and the phosphoric acid solution concentration of interpolation can be selected between 13-18%, and the amount that every 100g soil adds phosphoric acid is selected between 8 ~ 14mL.
Lead content is about to the lead-contaminated soil of 9000mg/kg, adding sodium phosphate can select between soil quality mark 9-11%, and the phosphoric acid solution concentration of interpolation can be selected between 15-20%, and the amount that every 100g soil adds phosphoric acid is selected between 9 ~ 15mL.
According to method of the present invention, after the adjustment in above scope can reach maintenance, leachate lead content is lower than the requirement of 0.25mg/L, and at this, we do not do concrete elaboration to embodiment.
Should be appreciated that those of ordinary skill in the art just design according to the present invention can make many modifications and variations without the need to creative work.Therefore, all technical staff in the art, all should by the determined protection domain of claims under this invention's idea on the basis of existing technology by the available technical scheme of logical analysis, reasoning, or a limited experiment.
Claims (4)
1. a method for the salt-stabilized reparation of lead-contaminated soil acid phosphatase, is characterized in that: comprise the steps: in the soil of lead contamination, adds sodium phosphate and phosphoric acid mixed solution, stirs, then maintenance.
2. the method for the salt-stabilized reparation of lead-contaminated soil acid phosphatase according to claim 1, it is characterized in that: concrete steps are: take lead-contaminated soil, measure lead tolerance, then excessive sodium phosphate is taken, sodium phosphate being dissolved in mass fraction is in the phosphoric acid solution of 5% ~ 20%, stir, every 100g soil needs phosphoric acid solution 5-15ml.
Above-mentioned sodium phosphate and phosphoric acid solution are evenly sprayed on lead-contaminated soil, stir, make the pH of soil be less than 5; Adjustment soil moisture content is 18%-23%, keeps this moisture content, maintenance 3 days under room temperature.
3. the method for the salt-stabilized reparation of lead-contaminated soil acid phosphatase according to claim 2, is characterized in that: the amount of described sodium phosphate is the 5%-11% of lead-contaminated soil quality.
4. the method for the salt-stabilized reparation of lead-contaminated soil acid phosphatase according to claim 3, it is characterized in that: lead-contaminated soil lead content being about to 1000mg/kg, add the sodium phosphate of soil quality mark 5-7%, it is the phosphoric acid solution of 8.0% ~ 13% that every 100g soil adds 5 ~ 11mL mass fraction;
Lead content is about to the lead-contaminated soil of 3000mg/kg, adds the sodium phosphate of soil quality mark 6-8%, it is the phosphoric acid solution of 10% ~ 15% that every 100g soil adds 7 ~ 13mL mass fraction;
Lead content is about to the lead-contaminated soil of 6000mg/kg, adds the sodium phosphate of soil quality mark 7-9%, it is the phosphoric acid solution of 13% ~ 18% that every 100g soil adds 8 ~ 14mL mass fraction;
Lead content is about to the lead-contaminated soil of 9000mg/kg, adds the sodium phosphate of soil quality mark 9-11%, every 100g soil add 9 ~ 15mL mass fraction be 15% ~ 20% phosphoric acid solution.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109894467A (en) * | 2017-12-07 | 2019-06-18 | 国家电投集团远达环保工程有限公司重庆科技分公司 | The restorative procedure of lead-contaminated soil |
| CN110105958A (en) * | 2019-06-14 | 2019-08-09 | 许昌学院 | A kind of the mine soil reparation reagent and its application method of heavy metal lead pollution |
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Cited By (2)
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| CN110105958A (en) * | 2019-06-14 | 2019-08-09 | 许昌学院 | A kind of the mine soil reparation reagent and its application method of heavy metal lead pollution |
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| CN104475443B (en) | 2017-02-22 |
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Effective date of registration: 20210820 Address after: 400039 2-2-4, No. 11 Mopanshan, Jiulongpo District, Chongqing Patentee after: CHONGQING HUIYA ENVIRONMENTAL PROTECTION ENGINEERING Co.,Ltd. Address before: No.69 Hongguang Avenue, Banan District, Chongqing Patentee before: Chongqing University of Technology |
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