CN104492806A - Preparation method of chromium-contaminated soil composite eluant - Google Patents
Preparation method of chromium-contaminated soil composite eluant Download PDFInfo
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- CN104492806A CN104492806A CN201410741658.8A CN201410741658A CN104492806A CN 104492806 A CN104492806 A CN 104492806A CN 201410741658 A CN201410741658 A CN 201410741658A CN 104492806 A CN104492806 A CN 104492806A
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Abstract
The invention discloses a preparation method of a chromium-contaminated soil composite eluant. The preparation method comprises the following steps: washing the surface of a slant PDA containing aspergillus niger by sterile water to obtain a first mixed material, placing the first mixed material in a sterile conical bottle, and carrying out shaking culture for 11-13h to obtain an aspergillus niger solution; crushing saponin shells to a particle size of 2-3mm, adding water for mixing, sterilizing at a high temperature, cooling to a room temperature, then adding the aspergillus niger solution, placing the saponin shells on a constant-temperature shaker, and culturing for 115-125h to obtain a second mixed material; and completely statically settling the second mixed material, adding an upper-layer liquid in citric acid and uniformly mixing to obtain the chromium-contaminated soil composite eluant. The chromium-contaminated soil composite eluant disclosed by the invention is simple and easily available in raw materials, simple in preparation process, capable of greatly lowering the preparation cost, high in elution rate on chromium in soil, and free of secondary pollution to repaired soil.
Description
Technical field
The present invention relates to technical field of soil remediation, particularly relate to a kind of preparation method of chromium-polluted soil compound eluent.
Background technology
Along with chromic salts is in a large amount of uses of the industry such as manufacture, intermetallic composite coating, process hides, printing and dyeing, chromium high concentration accumulation in the environment has become a kind of environmental problem that can not be ignored.And in recent years because chemical plant illegal dumping severe toxicity chromium slag causes local livestock dead, farmland, water quality severe contamination cause the event of chromium poisoning to cause the concern of each side.Meanwhile, due to historical reasons, the solid waste produced in China's major part chromium salt factory production process and chromium slag, mainly take the mode process of simply storing up, do not take seepage control measure.Containing a certain amount of water soluble hexavalent chromium in chromium slag, when precipitation drenches drop, this part water soluble hexavalent chromium can enter soil with pouring draining, and causes more serious pollution to underground water or surface water.
Soil leaching technology because it has small investment, consumes energy low, injures the advantages such as little to operating personnel, is widely used in many soil remediation in heavy metal pollution of soil reparation.Filter out suitable effective Soil leaching agent to unusual key the reparation of soil and important, but prior art is for the soil of pollution of chromium, especially has highly toxic chromic Soil leaching agent and all adopts organic acid eluent.And biosurfactant can remove the heavy metal of some kinds in soil because it has lower critical micelle concentration and cost is low, biological degradability is good, surface-active is large and do not have the advantages such as secondary pollution, the elution efficiency of chromium can be improved in chromium-polluted soil reparation.
Summary of the invention
Based on the technical problem that background technology exists, the present invention proposes a kind of preparation method of chromium-polluted soil compound eluent, the zymotic fluid of citric acid and waste biomass material Chinese honey locust is adopted to cooperatively interact, not only solve the lower predicament of chromium-polluted soil elution efficiency, clean, the conversion and cycle that achieve discarded object utilize simultaneously.
The preparation method of a kind of chromium-polluted soil compound eluent that the present invention proposes, comprises the steps:
S1, get inclined-plane PDA containing black-koji mould, the first mixed material is obtained behind surface with aseptic water washing inclined-plane PDA, first mixed material is placed in aseptic conical flask, and cultivate 11-13h with the speed oscillation of 145-155rpm and obtain black-koji mould liquid, cultivation temperature is 28-32 DEG C;
S2, pulverizing Chinese honey locust shell are 2-3mm to particle diameter, add water high-temperature sterilization after mixing, adds black-koji mould liquid, be placed in and constant-temperature table cultivates 115-125h obtain the second mixed material after being cooled to room temperature, the cultivation temperature of constant-temperature table is 28-32 DEG C, and constant-temperature table rotating speed is 145-155rpm;
S3, the second mixed material to be staticly settled completely, get supernatant liquid and add citric acid and mix and obtain chromium-polluted soil compound eluent.
Preferably, in S2, the mass volume ratio (g/L) of the Chinese honey locust shell after pulverizing and water is 8-12:10-15, and the mass volume ratio (g/L) of the Chinese honey locust shell after pulverizing and black-koji mould liquid is 5-10:2-3.
Preferably, in S2, the temperature of high-temperature sterilization is 120-125 DEG C, and the time of high-temperature sterilization is 18-21min.
Preferably, in S2, pulverizing Chinese honey locust shell is 2-3mm to particle diameter, the rear high-temperature sterilization of the mixing that adds water, the mass volume ratio (g/L) of the Chinese honey locust shell after pulverizing and water is 9-11:11-14, the temperature of high-temperature sterilization is 120-123 DEG C, the time of high-temperature sterilization is 19-20min, black-koji mould liquid is added after being cooled to room temperature, be placed in and constant-temperature table cultivates 119-121h obtain the second mixed material, the cultivation temperature of constant-temperature table is 29-30 DEG C, constant-temperature table rotating speed is 148-153rpm, Chinese honey locust shell after wherein pulverizing and the mass volume ratio (g/L) of black-koji mould liquid are 6-9:2.2-2.6.
Preferably, in S2, pulverizing Chinese honey locust shell is 2-3mm to particle diameter, the rear high-temperature sterilization of the mixing that adds water, the mass volume ratio (g/L) of the Chinese honey locust shell after pulverizing and water is 10:12, the temperature of high-temperature sterilization is 121 DEG C, the time of high-temperature sterilization is 20min, black-koji mould liquid is added after being cooled to room temperature, be placed in and constant-temperature table cultivates 120h obtain the second mixed material, the cultivation temperature of constant-temperature table is 30 DEG C, and constant-temperature table rotating speed is 150rpm, and the Chinese honey locust shell after wherein pulverizing and the mass volume ratio (g/L) of black-koji mould liquid are 3:1.
Preferably, in S3, citric acid concentration is 0.3-0.5mol/L.
Preferably, in S3, the volume ratio of supernatant liquid and citric acid is 0.8-1.2:0.8-1.2.
Preferably, in S3, staticly settled by the second mixed material completely, get supernatant liquid and add 0.4mol/L citric acid and mix and obtain chromium-polluted soil compound eluent, wherein the volume ratio of supernatant liquid and citric acid is 1:1.
Washout rate detection is carried out to the present invention: adopt PVC plastic pipe to make earth pillar, diameter 5.0cm, high 30.0cm, adopt gauze to wrap up bottom earth pillar, and use iron wire fixation, make it bear soil and allow eluent to flow out.Getting pedotheque adopts manual mode of filling to fill in earth pillar, and soil packed height is 20.0cm.Be that 1:20 injects the earth pillar prepared by the present invention according to solid-to-liquid ratio, leacheate injects from the top of earth pillar, regulates peristaltic pump coutroi velocity.Beaker is placed in below earth pillar, receives the compound eluent solution flowed out through earth pillar.Atomic absorption spectrophotometer is utilized to carry out chrome determination to receiving liquid.Result shows, and compound eluent can reach 93.2% to the washout rate of chromium-polluted soil.
The present invention adopts Chinese honey locust after black-koji mould fermentation, to be obtained by mixing with citric acid, raw material is simple and easy to get, greatly reduce chromium-polluted soil leacheate cost, and realize the cleaning of waste biomass material, recycle, high to the washout rate of Chromium in Soil through above-mentioned experiment proved invention, and secondary pollution can not be brought to rehabilitating soil.
Detailed description of the invention
Below, by specific embodiment, technical scheme of the present invention is described in detail.
Embodiment 1
The preparation method of a kind of chromium-polluted soil compound eluent that the present invention proposes, comprises the steps:
S1, get inclined-plane PDA containing black-koji mould, obtain the first mixed material behind the surface with aseptic water washing inclined-plane PDA, the first mixed material is placed in aseptic conical flask, cultivate 13h with the speed oscillation of 145rpm and obtain black-koji mould liquid, cultivation temperature is 28 DEG C;
S2, pulverizing Chinese honey locust shell are 2-3mm to particle diameter, the rear high-temperature sterilization of the mixing that adds water, the mass volume ratio (g/L) of the Chinese honey locust shell after pulverizing and water is 6:5, the temperature of high-temperature sterilization is 125 DEG C, the time of high-temperature sterilization is 18min, black-koji mould liquid is added after being cooled to room temperature, be placed in and constant-temperature table cultivates 125h obtain the second mixed material, the cultivation temperature of constant-temperature table is 28 DEG C, constant-temperature table rotating speed is 155rpm, and the Chinese honey locust shell after wherein pulverizing and the mass volume ratio (g/L) of black-koji mould liquid are 5:3;
S3, the second mixed material to be staticly settled completely, get supernatant liquid and add citric acid and mix and obtain chromium-polluted soil compound eluent.
Embodiment 2
The preparation method of a kind of chromium-polluted soil compound eluent that the present invention proposes, comprises the steps:
S1, get inclined-plane PDA containing black-koji mould, obtain the first mixed material behind the surface with aseptic water washing inclined-plane PDA, the first mixed material is placed in aseptic conical flask, cultivate 11h with the speed oscillation of 155rpm and obtain black-koji mould liquid, cultivation temperature is 32 DEG C;
S2, pulverizing Chinese honey locust shell are 2-3mm to particle diameter, the rear high-temperature sterilization of the mixing that adds water, the mass volume ratio (g/L) of the Chinese honey locust shell after pulverizing and water is 8:15, the temperature of high-temperature sterilization is 120 DEG C, the time of high-temperature sterilization is 21min, black-koji mould liquid is added after being cooled to room temperature, be placed in and constant-temperature table cultivates 115h obtain the second mixed material, the cultivation temperature of constant-temperature table is 32 DEG C, constant-temperature table rotating speed is 145rpm, and the Chinese honey locust shell after wherein pulverizing and the mass volume ratio (g/L) of black-koji mould liquid are 5:1;
S3, the second mixed material to be staticly settled completely, get supernatant liquid and add citric acid and mix and obtain chromium-polluted soil compound eluent.
Embodiment 3
The preparation method of a kind of chromium-polluted soil compound eluent that the present invention proposes, comprises the steps:
S1, get inclined-plane PDA containing black-koji mould, the first mixed material is obtained behind surface with aseptic water washing inclined-plane PDA, first mixed material is placed in aseptic conical flask, and cultivate 11.5h with the speed oscillation of 152rpm and obtain black-koji mould liquid, cultivation temperature is 31 DEG C;
S2, pulverizing Chinese honey locust shell are 2-3mm to particle diameter, the rear high-temperature sterilization of the mixing that adds water, the mass volume ratio (g/L) of the Chinese honey locust shell after pulverizing and water is 9:14, the temperature of high-temperature sterilization is 120 DEG C, the time of high-temperature sterilization is 20min, black-koji mould liquid is added after being cooled to room temperature, be placed in and constant-temperature table cultivates 119h obtain the second mixed material, the cultivation temperature of constant-temperature table is 30 DEG C, constant-temperature table rotating speed is 148rpm, and the Chinese honey locust shell after wherein pulverizing and the mass volume ratio (g/L) of black-koji mould liquid are 9:2.2;
S3, to be staticly settled by the second mixed material completely, get supernatant liquid and add 0.5mol/L citric acid and mix and obtain chromium-polluted soil compound eluent, wherein the volume ratio of supernatant liquid and citric acid is 2:3.
Embodiment 4
The preparation method of a kind of chromium-polluted soil compound eluent that the present invention proposes, comprises the steps:
S1, get inclined-plane PDA containing black-koji mould, the first mixed material is obtained behind surface with aseptic water washing inclined-plane PDA, first mixed material is placed in aseptic conical flask, and cultivate 12.5h with the speed oscillation of 148rpm and obtain black-koji mould liquid, cultivation temperature is 29 DEG C;
S2, pulverizing Chinese honey locust shell are 2-3mm to particle diameter, the rear high-temperature sterilization of the mixing that adds water, the mass volume ratio (g/L) of the Chinese honey locust shell after pulverizing and water is 1:1, the temperature of high-temperature sterilization is 123 DEG C, the time of high-temperature sterilization is 19min, black-koji mould liquid is added after being cooled to room temperature, be placed in and constant-temperature table cultivates 121h obtain the second mixed material, the cultivation temperature of constant-temperature table is 29 DEG C, constant-temperature table rotating speed is 153rpm, and the Chinese honey locust shell after wherein pulverizing and the mass volume ratio (g/L) of black-koji mould liquid are 3:1.3;
S3, to be staticly settled by the second mixed material completely, get supernatant liquid and add 0.3mol/L citric acid and mix and obtain chromium-polluted soil compound eluent, wherein the volume ratio of supernatant liquid and citric acid is 3:2.
Embodiment 5
The preparation method of a kind of chromium-polluted soil compound eluent that the present invention proposes, comprises the steps:
S1, get inclined-plane PDA containing black-koji mould, obtain the first mixed material behind the surface with aseptic water washing inclined-plane PDA, the first mixed material is placed in aseptic conical flask, cultivate 12h with the speed oscillation of 150rpm and obtain black-koji mould liquid, cultivation temperature is 30 DEG C;
S2, pulverizing Chinese honey locust shell are 2-3mm to particle diameter, the rear high-temperature sterilization of the mixing that adds water, the mass volume ratio (g/L) of the Chinese honey locust shell after pulverizing and water is 5:6, the temperature of high-temperature sterilization is 121 DEG C, the time of high-temperature sterilization is 20min, black-koji mould liquid is added after being cooled to room temperature, be placed in and constant-temperature table cultivates 120h obtain the second mixed material, the cultivation temperature of constant-temperature table is 30 DEG C, constant-temperature table rotating speed is 150rpm, and the Chinese honey locust shell after wherein pulverizing and the mass volume ratio (g/L) of black-koji mould liquid are 3:1;
S3, to be staticly settled by the second mixed material completely, get supernatant liquid and add 0.4mol/L citric acid and mix and obtain chromium-polluted soil compound eluent, wherein the volume ratio of supernatant liquid and citric acid is 1:1.
The above; be only the present invention's preferably detailed description of the invention; but protection scope of the present invention is not limited thereto; anyly be familiar with those skilled in the art in the technical scope that the present invention discloses; be equal to according to technical scheme of the present invention and inventive concept thereof and replace or change, all should be encompassed within protection scope of the present invention.
Claims (8)
1. a preparation method for chromium-polluted soil compound eluent, is characterized in that, comprises the steps:
S1, get inclined-plane PDA containing black-koji mould, the first mixed material is obtained behind surface with aseptic water washing inclined-plane PDA, first mixed material is placed in aseptic conical flask, and cultivate 11-13h with the speed oscillation of 145-155rpm and obtain black-koji mould liquid, cultivation temperature is 28-32 DEG C;
S2, pulverizing Chinese honey locust shell are 2-3mm to particle diameter, add water high-temperature sterilization after mixing, adds black-koji mould liquid, be placed in and constant-temperature table cultivates 115-125h obtain the second mixed material after being cooled to room temperature, the cultivation temperature of constant-temperature table is 28-32 DEG C, and constant-temperature table rotating speed is 145-155rpm;
S3, the second mixed material to be staticly settled completely, get supernatant liquid and add citric acid and mix and obtain chromium-polluted soil compound eluent.
2. the preparation method of chromium-polluted soil compound eluent according to claim 1, it is characterized in that, in S2, the mass volume ratio (g/L) of the Chinese honey locust shell after pulverizing and water is 8-12:10-15, and the mass volume ratio (g/L) of the Chinese honey locust shell after pulverizing and black-koji mould liquid is 5-10:2-3.
3. the preparation method of chromium-polluted soil compound eluent according to claim 1 or 2, it is characterized in that, in S2, the temperature of high-temperature sterilization is 120-125 DEG C, and the time of high-temperature sterilization is 18-21min.
4. the preparation method of chromium-polluted soil compound eluent according to any one of claim 1-3, it is characterized in that, in S2, pulverizing Chinese honey locust shell is 2-3mm to particle diameter, the rear high-temperature sterilization of the mixing that adds water, the mass volume ratio (g/L) of the Chinese honey locust shell after pulverizing and water is 9-11:11-14, the temperature of high-temperature sterilization is 120-123 DEG C, the time of high-temperature sterilization is 19-20min, black-koji mould liquid is added after being cooled to room temperature, be placed in and constant-temperature table cultivates 119-121h obtain the second mixed material, the cultivation temperature of constant-temperature table is 29-30 DEG C, constant-temperature table rotating speed is 148-153rpm, Chinese honey locust shell after wherein pulverizing and the mass volume ratio (g/L) of black-koji mould liquid are 6-9:2.2-2.6.
5. the preparation method of chromium-polluted soil compound eluent according to any one of claim 1-4, it is characterized in that, in S2, pulverizing Chinese honey locust shell is 2-3mm to particle diameter, the rear high-temperature sterilization of the mixing that adds water, the mass volume ratio (g/L) of the Chinese honey locust shell after pulverizing and water is 10:12, the temperature of high-temperature sterilization is 121 DEG C, the time of high-temperature sterilization is 20min, black-koji mould liquid is added after being cooled to room temperature, be placed in and constant-temperature table cultivates 120h obtain the second mixed material, the cultivation temperature of constant-temperature table is 30 DEG C, constant-temperature table rotating speed is 150rpm, Chinese honey locust shell after wherein pulverizing and the mass volume ratio (g/L) of black-koji mould liquid are 3:1.
6. the preparation method of chromium-polluted soil compound eluent according to any one of claim 1-5, it is characterized in that, in S3, citric acid concentration is 0.3-0.5mol/L.
7. the preparation method of chromium-polluted soil compound eluent according to any one of claim 1-6, it is characterized in that, in S3, the volume ratio of supernatant liquid and citric acid is 0.8-1.2:0.8-1.2.
8. the preparation method of chromium-polluted soil compound eluent according to any one of claim 1-6, it is characterized in that, in S3, second mixed material is staticly settled completely, get supernatant liquid to add 0.4mol/L citric acid and mix and obtain chromium-polluted soil compound eluent, wherein the volume ratio of supernatant liquid and citric acid is 1:1.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108435772A (en) * | 2018-02-26 | 2018-08-24 | 中冶华天南京工程技术有限公司 | Method for restoration of soil polluted by heavy metal |
| CN110665960A (en) * | 2019-11-15 | 2020-01-10 | 安徽国祯环境修复股份有限公司 | Chemical leaching remediation process for chromium-contaminated soil |
| CN114479875A (en) * | 2022-02-23 | 2022-05-13 | 生态环境部南京环境科学研究所 | Eluting agent for restoring pesticide chemical polluted soil and preparation process thereof |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102247980A (en) * | 2011-07-04 | 2011-11-23 | 中国科学院过程工程研究所 | Remediation agent for leaching soil polluted by heavy metal chrome |
| CN102601106B (en) * | 2012-03-08 | 2014-12-24 | 中国科学院过程工程研究所 | Ectopic leaching restoring device and restoring method for chromic slag polluted soil |
| CN103909089B (en) * | 2014-04-14 | 2015-09-23 | 北京矿冶研究总院 | Method for leaching heavy metal contaminated soil |
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2014
- 2014-12-09 CN CN201410741658.8A patent/CN104492806B/en not_active Expired - Fee Related
Non-Patent Citations (1)
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| 任婉侠等: "土壤重金属生物淋滤修复过程中廉价碳源的筛选研究", 《农业环境科学学报》 * |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108435772A (en) * | 2018-02-26 | 2018-08-24 | 中冶华天南京工程技术有限公司 | Method for restoration of soil polluted by heavy metal |
| CN110665960A (en) * | 2019-11-15 | 2020-01-10 | 安徽国祯环境修复股份有限公司 | Chemical leaching remediation process for chromium-contaminated soil |
| CN114479875A (en) * | 2022-02-23 | 2022-05-13 | 生态环境部南京环境科学研究所 | Eluting agent for restoring pesticide chemical polluted soil and preparation process thereof |
| CN114479875B (en) * | 2022-02-23 | 2022-11-22 | 生态环境部南京环境科学研究所 | Eluting agent for restoring pesticide chemical polluted soil and preparation process thereof |
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