CN102337400A - Indigenous microbiological leaching method of cadmium in cadmium-containing sediments - Google Patents
Indigenous microbiological leaching method of cadmium in cadmium-containing sediments Download PDFInfo
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- CN102337400A CN102337400A CN2010102302864A CN201010230286A CN102337400A CN 102337400 A CN102337400 A CN 102337400A CN 2010102302864 A CN2010102302864 A CN 2010102302864A CN 201010230286 A CN201010230286 A CN 201010230286A CN 102337400 A CN102337400 A CN 102337400A
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- cadmium
- leaching
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
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Abstract
The invention relates to an indigenous microbiological leaching method of cadmium in cadmium-containing sediments, characterized by using (NH4)2SO4, KCl, K2HPO4, MgSO4.7H2O, Ca(NO3)2 and FeSO4.7H2O as a medium, activating indigenous microorganisms in the cadmium-containing sediments to let indigenous microorganisms multiply, and leaching cadmium out of the sediments. The leached leachate contains a large amount of indigenous microorganisms, the leaching rate of cadmium is 89%, the color of the sediments turns to brick red gradually in the leaching process, and the contents of acid extractable cadmium, reducible cadmium, oxidizable cadmium and residual cadmium in the sediments are signally reduced. The residues after leaching can be treated as general solid waste.
Description
Technical field
The present invention relates to contain the mikrobe leaching field of heavy metal in the cadmium sediment, particularly the mikrobe of cadmium is leached.
Technical background
Along with the development gradually of metallurgy industry, the smelting industry wastewater processing technology is more and more advanced, and the heavy metal wastewater thereby reclamation rate improves gradually, but incident be that the sediment that contains heavy metal is handled problems.China has stored up a large amount of heavy metal sediments for a long time, and along with the development heavy metal sediment weight of smelting industry will increase gradually.It is higher but be difficult to realize smelting reclaim to smelt after the WWT in the sediment heavy metal content, and surrounding environment is had potential harm, is prone to cause the heavy metal contamination incident.
Be the harm that heavy metal element in the sediment after the wastewater treatment of solution smelting enterprise possibly cause environment, part experts and scholars have carried out a large amount of research to the method for removing the heavy metal in the sediment.Comprise IX, chlorination, electrochemistry, chemical leaching, bioleaching etc., wherein chemical leaching be take at present form the most widely.But there is the high defective of processing cost in chemical process, and the medicament that drops into still remains in the sediment greatly, and is bigger to the spinoff of sediment.
The bioleaching method that originates from the mikrobe hydrometallurgy in recent years more and more receives publicity because of consuming advantages such as acid is few, running cost is low, removal efficiency of heavy metals is high, practical.Mikrobe leaches that to contain cadmium in the cadmium sediment mainly be that adding through substratum activates the mikrobe that in the sediment cadmium metal is had resistance; Make its growth and breeding; And carry out physics chemical action with cadmium and make non-water-soluble attitude cadmium be converted into water-soluble attitude cadmium, realize the resource utilization of cadmium in the sediment.
Summary of the invention
The object of the present invention is to provide a kind of indigenous microorganism leaching method that contains cadmium in the cadmium sediment; This method contains the cadmium sediment through having the microbiological treatment that to transform non-water-soluble attitude cadmium be water-soluble attitude cadmium function; Operation is simple, and cost is low, is a kind of environment-friendly treatment method.
Technical scheme of the present invention is: adopt the smelting sediment that contains the indigenous microorganism that can transform the Cd form, in sediment, add and leach substratum, activate indigenous microorganism in the sediment, make its breeding and leach cadmium in the sediment.
Said leaching substratum is (NH
4)
2SO
42.5~3.5gL
-1, KCl 0.05~0.2gL
-1, K
2HPO
40.3~0.6gL
-1, MgSO
47H
2O 0.3~0.7gL
-1, Ca (NO
3)
20.01gL
-1, FeSO
47H
2O44.5~45.0gL
-1
Leach substratum and join that addition is in the sediment: solid-liquid mass volume ratio g: mL is 6~8: 100,
Regulating leaching system pH is 3.0, and the temperature that leaches system is 30 ℃ cultivation 3-4 days.
The contriver gathers the Zhuzhou and smelts after group's WWT sediment in the sediment stockyard; Detect through biomicroscope, have the indigenous microorganism that can transform the Cd form in this sediment, the adding of substratum activates this mikrobe; Make its a large amount of breedings, can leach heavy metal Cd in the sediment.
Method detailed technology scheme of the present invention may further comprise the steps:
(1), ball milling, crosses 0.1mm sieve back in 80 ℃ of oven dry with the sediment natural air drying of gathering;
(2) configuration substratum: (NH
4)
2SO
43gL
-1, KCl 0.1gL
-1, K
2HPO
40.5gL
-1, MgSO
47H
2O 0.5gL
-1, Ca (NO
3)
20.01gL
-1, FeSO
47H
2O44.7gL
-1, using NaOH to regulate the pH value is 1.8~2.0;
(3) in containing the cadmium sediment, directly add above-mentioned substratum, the substratum addition is: (g: mL) be 7: 100, regulation system pH is 3.0 to the solid-liquid mass volume ratio, is positioned in 30 ℃ the incubator to cultivate 3-4 days, and cadmium content reduces by 89% through detecting in the sediment.
The present invention directly adds substratum and carries out the indigenous microorganism leaching in containing the cadmium sediment, the indigenous microorganism of proposition leaches the method that contains cadmium in the cadmium sediment and has following advantage:
Compare with the physical chemistry restorative procedure of traditional method, containing in the cadmium sediment cadmium, to leach cost lower, and do not produce secondary pollution, is a kind of environmentally friendly restorative procedure.The present invention cultivates based in the sediment through directly adding, and adopts cadmium in the indigenous microorganism leaching sediment, and operation is simple, and leaching yield is high, and within 4 days, the cadmium leaching yield leaches the back sediment and belongs to general solid useless through leaching the toxicity discriminating up to 89% in the sediment.And has the incomparable meliority of other biological restorative procedure aspect environmental safety, operation convenience and the application cost.
Description of drawings
Fig. 1: substratum adds indigenous microorganism figure in the leach liquor of back
Fig. 2: indigenous microorganism is to cadmium leaching effect figure in the sediment
Fig. 3: leaching process sediment colour-change
Fig. 4: each form content of cadmium in the sediment before and after leaching
Embodiment
Embodiment 1: the indigenous microorganism leaching experiment that contains cadmium in the cadmium sediment
Step 1: contain cadmium sediment natural air drying with what the Zhuzhou smelted that group sediment stockyard gathers, ball milling, cross 0.1mm sieve back in 80 ℃ of oven dry, get the 7g slag specimen and put into the 150ml Erlenmeyer flask, other gets the 7g slag specimen and puts into the 150ml Erlenmeyer flask and sterilize as reference.
Step 2: the configuration substratum, medium component is (NH
4)
2SO
43gL
-1, KCl 0.1gL
-1, K
2HPO
40.5gL
-1, MgSO
47H
2O 0.5gL
-1, Ca (NO
3)
20.01gL
-1, FeSO
47H
2O 44.7gL
-1, using NaOH to regulate the pH value is 1.8~2.0.
Step 3: in Erlenmeyer flask, add 100ml step 2 respectively and join substratum; Regulation system pH value is 3.0; And replace substratum as reference with water and dilute sulphuric acid; Put into the constant-temperature shaking case and cultivate to leach, get leach liquor after the leaching and examine under a microscope the leach liquor microbial morphology, detect in the leach liquor cadmium content and calculate leaching yield.
After leaching 4d, contain a large amount of mikrobes (seeing accompanying drawing 1) in the leach liquor, water and diluted acid are very low as cadmium leaching yield in the substratum sediment, have only 2.19% and 8.83% respectively; The sterilization sediment in the cadmium leaching yield also have only 27%, and in the sediment of not sterilizing the cadmium leaching yield up to 89% (seeing accompanying drawing 2).
Embodiment 2: leaching process sediment signature analysis
Press instance 1 and leach cadmium in the sediment, observe leaching process sediment colour-change.Get the recrement that leaches after 1 day, 3 days and 5 days, employing ultrapure water and pH are 3 acid solution drip washing twice respectively, under 80 ℃, dry, sieve, each form content of cadmium in the recrement behind the analysis leaching 5d.
Slag specimen color generation considerable change in the leaching process, former slag specimen color gray, after the 24h leaching, the slag specimen color is reddened by grey gradually, and after leaching through 120h, slag specimen is brick-red (seeing accompanying drawing 3).Leach in the recrement of back acid and can extract attitude cadmium, reducible attitude cadmium, oxidable attitude cadmium and residual form cadmium content significant reduction is all arranged, be reduced to 80mg/kg, 130mg/kg, 150mg/kg and 370mg/kg (seeing accompanying drawing 4) after the leaching by the 1560mg/kg in the former slag, 740mg/kg, 840mg/kg, 1390mg/kg respectively.
Claims (4)
1. indigenous microorganism leaching method that contains cadmium in the cadmium sediment; It is characterized in that, adopt the smelting sediment that contains the indigenous microorganism that can transform the Cd form, in sediment, add and leach substratum; Activate indigenous microorganism in the sediment, make its breeding and leach cadmium in the sediment.
2. microbe leaching-out method as claimed in claim 1 is characterized in that: said leaching substratum is (NH
4)
2SO
42.5~3.5gL
-1, KCl 0.05~0.2gL
-1, K
2HPO
40.3~0.6gL
-1, MgSO
47H
2O 0.3~0.7gL
-1, Ca (NO
3)
20.01gL
-1, FeSO
47H
2O44.5~45.0gL
-1
3. according to claim 1 or claim 2 microbe leaching-out method is characterized in that: soak substratum and join that addition is in the sediment: solid-liquid mass volume ratio g: mL is 6~8: 100,
4. microbe leaching-out method as claimed in claim 3 is characterized in that: regulating leaching system pH is 3.0, and the temperature that leaches system is 30 ℃ cultivation 3-4 days.
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Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CA1023947A (en) * | 1974-06-27 | 1978-01-10 | Centre De Recherches Minerales, Ministere Des Richesses Naturelles Du Qu Ebec | Selective bacterial cyclic leaching process |
DD225416A1 (en) * | 1984-03-21 | 1985-07-31 | Adw Ddr | METHOD FOR MICROBIAL CADMIUM REMOVAL |
CN1375553A (en) * | 2002-04-25 | 2002-10-23 | 南京农业大学 | Ferrous oxide theobacillus and sludge heavy-metal eliminating method therewith |
CN101337731A (en) * | 2008-08-13 | 2009-01-07 | 彭克俭 | Method for removing cadmium in industrial wastewater by bio adsorbing agent |
CN101381816A (en) * | 2008-01-25 | 2009-03-11 | 佛山市邦普镍钴技术有限公司 | Method and equipment for recovering cadmium and nickel from waste and old nickel-cadmium battery and preparing metal cadmium ingot and superfine nickel powder |
-
2010
- 2010-07-19 CN CN2010102302864A patent/CN102337400A/en active Pending
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CA1023947A (en) * | 1974-06-27 | 1978-01-10 | Centre De Recherches Minerales, Ministere Des Richesses Naturelles Du Qu Ebec | Selective bacterial cyclic leaching process |
DD225416A1 (en) * | 1984-03-21 | 1985-07-31 | Adw Ddr | METHOD FOR MICROBIAL CADMIUM REMOVAL |
CN1375553A (en) * | 2002-04-25 | 2002-10-23 | 南京农业大学 | Ferrous oxide theobacillus and sludge heavy-metal eliminating method therewith |
CN101381816A (en) * | 2008-01-25 | 2009-03-11 | 佛山市邦普镍钴技术有限公司 | Method and equipment for recovering cadmium and nickel from waste and old nickel-cadmium battery and preparing metal cadmium ingot and superfine nickel powder |
CN101337731A (en) * | 2008-08-13 | 2009-01-07 | 彭克俭 | Method for removing cadmium in industrial wastewater by bio adsorbing agent |
Non-Patent Citations (2)
Title |
---|
朱南文等: "污泥中重金属的生物沥滤及其机理分析", 《上海交通大学学报》 * |
黄顺红: "铬渣堆场铬污染特征及其铬污染土壤微生物修复研究", 《中国博士学位论文全文数据库》 * |
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Application publication date: 20120201 |