CN107541215A - It is a kind of can place application heavy metal-polluted soil elution liquid and preparation method thereof and use - Google Patents
It is a kind of can place application heavy metal-polluted soil elution liquid and preparation method thereof and use Download PDFInfo
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- CN107541215A CN107541215A CN201610460306.4A CN201610460306A CN107541215A CN 107541215 A CN107541215 A CN 107541215A CN 201610460306 A CN201610460306 A CN 201610460306A CN 107541215 A CN107541215 A CN 107541215A
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Abstract
The present invention relates to it is a kind of can place application heavy metal-polluted soil elution liquid and preparation method thereof and use.Concrete measure is：A set of moveable microbial fermentation device configuration is repaired in place in heavy-metal contaminated soil, organic acid fermentation liquid is prepared in situ, and applied to the elution reparation of heavy-metal contaminated soil.The invention realizes the now-making-now-using of leacheate during reparation, improves the utilization rate of raw material, and is easy to venuisation and scale, and new technology is proposed for the elution reparation of heavy-metal contaminated soil.In addition, prepared organic acid fermentation liquid not only elutes significant effect, and it is smaller to soil physico-chemical property and structure destruction, it is easy to degrade, is not easy secondary pollution, is a kind of environmentally friendly leacheate.Therefore, the invention has a good application prospect in the elution reparation of heavy-metal contaminated soil.
Description
Technical field
The invention belongs to remediation of heavy metal-contaminated soil field.More particularly to it is a kind of can place application soil a huge sum of money
Category elution liquid and preparation method thereof and use.
Background technology
With the continuous development and progress of industrial technology and national economy, also the every field to ecological environment is brought not
With the pollution problem of degree, wherein, during exploitation of mineral resources, enterprise's production, fuel combustion and agriculture chemical administration etc.
Irrational aspects make it that heavy metal pollution of soil is on the rise in global range., can be in soil after heavy metal enters soil
Constantly enrichment, causes heavy metal content in soil exceeded, and the harm thus brought is many-sided, multi-level, and heavy metal is not only right
The property and structure of soil do great damage, and the also existence to plant in soil and microorganism and growth generates negative shadow
Ring, it is often more important that, hence into food chain, finally the life to the mankind and health are formed greatly threatens heavy metal.Therefore,
Concern and attention significant, the development and application of heavy metal contaminated soil remediation technology to heavy metal pollution of soil problem
It is most important.
At present, remediation of heavy metal-contaminated soil mainly includes peripheral doses technology, chemical remediation technology, biological prosthetic
Technology and combined remediation technology etc..Can be according to soil property, the type and extent of heavy metal pollution, reparation place, reparation degree
Different recovery technique is selected Deng material elements, the characteristics of each recovery technique has its own, advantage and usable condition.Chemistry is repaiied
Recovering technology is according to soil property and the wherein species and status of heavy metal, using corresponding reagent of repairing to a soil huge sum of money
Category is adsorbed, precipitated, extracted or redox, and content and biological effectiveness of the heavy metal in soil are reduced with this.Wherein,
Chemical leaching recovery technique is exactly that a kind of cycle is short, and repairing effect is notable, does not easily cause the soil restoring technology of secondary pollution, should
Technology makes eluent sufficiently be mixed and reacted with polluted soil by extraneous strength, the heavy metal in activating soil,
It is departed from soil with leacheate, collect and handle leacheate, so as to reach the purpose of purification soil.
In chemical leaching recovery technique, conventional leacheate has inorganic eluent, chelating agent and surfactant etc..These
Leacheate comes with some shortcomings in the repair process of heavy-metal contaminated soil, such as inorganic eluent, includes common inorganic
Acid, alkali, salt etc., the cost of these reagents is relatively low, and speed of action is very fast, and action effect is preferable, but these reagents enter soil it
Afterwards, the structure to soil and physicochemical property will all produce larger destruction, and are difficult to reclaim and reuse after eluting；And for example chela
Mixture, there is comparatively ideal removal effect to heavy metal-polluted soil, show good application prospect, but chelating agent, especially people
Work chelating agent, not only cost is higher, and biological degradability is poor, easily pollutes environment.These unfavorable factors all make it actually should
Limitation in be present.
Therefore, being applied to by elution technique in heavy-metal contaminated soil repair process, key technology is according to actual
Situation obtains economic and practical type and environmentally friendly leacheate, and this not only needs to make existing leacheate corresponding improvement, or
It is to propose new leacheate, it is also desirable to introduce the technology and equipment of correlation, improved from elution liquid preparing process angle heavy metal-polluted
Contaminate soil restoring technology.In a word, remediation of heavy metal-contaminated soil core is the development and application of leacheate.It is a kind of good
Leacheate should be easy to prepare, and be easy to venuisation and scale, and raw material availability is high, and production cost is low.Secondly, should also possess
Significant effect is eluted, it is smaller to soil texture and physicochemical property destruction, it is easy to degrade in the environment, does not easily cause secondary pollution etc.
Advantage.
The content of the invention
Based on economic and practical described in background technology and environmentally friendly leacheate in remediation of heavy metal-contaminated soil
Status and importance.The present invention propose it is a kind of can place application heavy metal-polluted soil elution liquid and preparation method thereof and use, should
Invention realizes the now-making-now-using of leacheate, improves the utilization rate of raw material, reduces production cost, is easy to venuisation and rule
Modelling, and significant effect is eluted, smaller to soil texture and physicochemical property destruction, biodegradability is good, is not easy secondary pollution.
It is proposed by the invention it is a kind of can place application heavy metal-polluted soil elution liquid and preparation method thereof and use, its technical side
Case is：A set of moveable microbial fermentation device configuration is repaired in place in heavy-metal contaminated soil, prepares a kind of energy
The organic acid fermentation liquid of heavy metal-polluted soil is effectively removed, and is repaired as leacheate heavy metal contaminated soil.
Microorganism used therefor Zymolysis Equipment of the present invention includes：Full-automatic mechanical stirred-tank fermenter, steam generator, air accumulator
And air compressor.It is corn flour to prepare carbon source used in organic acid fermentation liquid, and microorganism used therefor strain is aspergillus niger.It was prepared
Journey is as follows：
A. the preparation of saccharified liquid：Commercially available corn flour is sized mixing with water by 18-23% mass ratio, heats and is stirred continuously, then
Its temperature is maintained at 90-100 DEG C, Thermostable α-Amylase is added in 0.2-0.5 g/kg ratio, is sufficiently stirred, continues 60-
90 min, cooling, then plus water recovers to original volume；
B. the preparation of the saccharification stillness of night：By saccharified liquid filtering obtained by A, the saccharification stillness of night is produced；
C. the configuration of culture medium：Prepared saccharified liquid and its saccharification stillness of night are mixed by 10-15% volume ratio, and adds and accounts for
Gross weight 0.2-0.5% ammonium sulfate, regulation pH are 5.0-7.0, are put into fermentation tank, 121 DEG C of 30 min of sterilizing；
D. microbial fermentation：After fermentation jar temperature is down to 38 DEG C, the aspergillus niger strain activated is accessed under aseptic condition,
And fermented.Fermentation parameter is as follows：Fermentation temperature is 32-38 DEG C；Ventilation is 0.2-0.6 vvm；Speed of agitator is
200-260 rpm；Fermentation period is 86-114 h.
The organic acid fermentation liquid of preparation is diluted 1.5-2.0 times, produces heavy metal-polluted soil leacheate.
The specifically used mode of leacheate is：By heavy-metal contaminated soil and gained leacheate according to 1:16-24 solid-liquid
Than（g/mL）Mixing, fully reacts in stirred tank.The waste liquid after elution is collected, is followed after removing removing heavy metals using adsorbent
Ring uses, and sorbent used is flyash.
Content of the invention using heavy metal in leacheate after aas determination soil and reparation, and in terms of this
Calculate the elution clearance of heavy metal-polluted soil.Do 5 parallel laboratory tests.
Microbial fermentation equipment is introduced heavy-metal contaminated soil as a part for elution prosthetic appliance and repaiied by the present invention
In multiple place, it is used in combination with other elution equipment, heavy metal is carried out using the organic acid fermentation liquid prepared by it as leacheate
The elution reparation of contaminated soil, the results showed that, the invention possesses feasibility in actual applications, to heavy metal-polluted soil Pb, Cu,
Cr, Cd elution clearance is respectively：49.94%th, 32.45%, 43.76% and 59.83%, can effectively repairing heavy metal pollution soil
Earth.
It is proposed by the present invention it is a kind of can place application heavy metal-polluted soil elution liquid and preparation method thereof and use, its advantage embodies
：1. at present, microorganism fermentation process technology maturation, and industrialized production has been realized, if the citric acid fermentation technique in China
Be in a leading position level in the world, the introducing of Zymolysis Equipment and technology, and the now-making-now-using of eluent can be achieved, can improve raw material
Utilization rate, production cost can be reduced, can be achieved recovery technique venuisation and scale.Organic acid fermentation prepared by 2.
Liquid is a kind of leacheate rich in development prospect, not only has good removal effect to heavy metal-polluted soil, and to the knot of soil
Structure and physicochemical property destruction are smaller, are easy to degrade in the environment, do not easily cause secondary pollution.It is one that these, which all indicate the invention,
Remediation of heavy metal-contaminated soil of the kind with actual application prospect.
Instantiation
Below, with reference to instantiation the invention is proposed it is a kind of can place apply heavy metal-polluted soil elution liquid and preparation method thereof and
Using being described in further detail, but its protection domain is not limited thereto.
Example 1
Microbial fermentation device configuration is repaired in place in heavy-metal contaminated soil, specifically included：Full-automatic mechanical stirring-type
Fermentation tank, steam generator, air accumulator and air compressor.
The preparation of organic acid fermentation liquid is carried out by following four step：
A. the preparation of saccharified liquid：Commercially available corn flour is sized mixing with water by 21% mass ratio, heats and is stirred continuously, is then maintained
Its temperature adds Thermostable α-Amylase at 90-100 DEG C, in 0.3 g/kg ratio, is sufficiently stirred, continues 80 min, cools down,
Then plus water recovers to original volume.
B. the preparation of the saccharification stillness of night：By saccharified liquid filtering obtained by A, the saccharification stillness of night is produced.
C. the configuration of culture medium：Prepared saccharified liquid and its saccharification stillness of night are mixed by 15% volume ratio, and added
The ammonium sulfate of gross weight 0.3% is accounted for, regulation pH is 5.0, is put into fermentation tank, 121 DEG C of 30 min of sterilizing.
D. microbial fermentation：After fermentation jar temperature is down to 38 DEG C, the black-koji mould activated is accessed under aseptic condition
Kind, and fermented.Fermentation parameter is as follows：Fermentation temperature is 36 DEG C；Ventilation is 0.4 vvm；Speed of agitator is 230
rpm；Fermentation period is 102 h.
The organic acid fermentation liquid of preparation is diluted 1.6 times, produces heavy metal-polluted soil leacheate.
By heavy-metal contaminated soil and gained leacheate according to 1:18 solid-to-liquid ratio（g/mL）Mixing, in stirred tank
Fully reaction.The waste liquid after elution is collected, goes removing heavy metals Posterior circle to use using adsorbent, sorbent used is flyash.
Using the content of heavy metal in leacheate after aas determination soil and reparation, and soil is calculated with this
The elution clearance of heavy metal.Do 5 parallel laboratory tests.Repairing effect is as shown in table 1.
Table 1
| Element | Pb | Cu | Cr | Cd |
| Clearance（%） | 49.94 | 32.45 | 43.76 | 59.83 |
Example 2
On the basis of example 1, the extension rate of organic acid fermentation liquid is changed to 1.8 times, heavy-metal contaminated soil and leacheate
Solid-to-liquid ratio be changed to 1:24.Repairing effect is as shown in table 2：
Table 2
| Element | Pb | Cu | Cr | Cd |
| Clearance（%） | 48.12 | 31.31 | 41.42 | 58.92 |
Example 3
On the basis of example 1, change organic acid fermentation liquid preparing process parameter, be specially：The matter of corn flour and water in step A
Amount is than being 18%, and the ratio for adding Thermostable α-Amylase is 0.2 g/kg, and the duration is 75 min；Corn flour liquid in step C
It is 12% to change liquid with the volume ratio that corn flour liquefaction clear liquid mixes, and the ammonium sulfate of addition accounts for the 0.25% of gross weight, and regulation pH is
6.0；Ventilation is 0.3 vvm in step D, and rotating speed is 245 rpm, and temperature is 35 DEG C, and fermentation period is 98 h.Repairing effect
As shown in table 3：
Table 3
| Element | Pb | Cu | Cr | Cd |
| Clearance（%） | 45.31 | 28.18 | 40.23 | 56.42 |
Example 4
On the basis of example 3, the extension rate of organic acid fermentation liquid is changed to 1.5 times, heavy-metal contaminated soil and leacheate
Solid-to-liquid ratio be changed to 1:20.Repairing effect is as shown in table 4：
Table 4
| Element | Pb | Cu | Cr | Cd |
| Clearance（%） | 47.92 | 31.08 | 41.96 | 58.06 |
Claims (7)
1. it is a kind of can place application heavy metal-polluted soil elution liquid and preparation method thereof and use, it is characterised in that will it is a set of movably
Microbial fermentation device configuration is repaired in place in heavy-metal contaminated soil, is prepared in situ organic acid fermentation liquid, and as
A kind of leacheate is applied to the elution reparation of heavy-metal contaminated soil.
2. elution liquid and preparation method thereof according to claim 1, it is characterised in that microorganism used therefor Zymolysis Equipment includes：Entirely certainly
Motivation tool stirred-tank fermenter, steam generator, air accumulator and air compressor.
3. elution liquid and preparation method thereof according to claim 1, it is characterised in that carbon source used in preparing organic acid fermentation liquid is
Corn flour, microorganism used therefor strain are aspergillus niger；
Its preparation process is as follows：
A. the preparation of saccharified liquid：Commercially available corn flour is sized mixing with water by 18-23% mass ratio, heats and is stirred continuously, then
Its temperature is maintained at 90-100 DEG C, Thermostable α-Amylase is added in 0.2-0.5g/kg ratio, is sufficiently stirred, continues 60-90
Min, cooling, then plus water recovers to original volume；
B. the preparation of the saccharification stillness of night：By saccharified liquid filtering obtained by A, the saccharification stillness of night is produced；
C. the configuration of culture medium：Prepared saccharified liquid and its saccharification stillness of night are mixed by 10-15% volume ratio, and adds and accounts for
Gross weight 0.2-0.5% ammonium sulfate, regulation pH are 5.0-7.0, are put into fermentation tank, 121 DEG C of sterilizing 30min；
D. microbial fermentation：After fermentation jar temperature is down to 38 DEG C, the aspergillus niger strain activated is accessed under aseptic condition,
And fermented.
4. the elution liquid and preparation method thereof according to D in claim 3, it is characterized in that, fermentation parameter is as follows：Fermentation temperature
For 32-38 DEG C；Ventilation is 0.2-0.6 vvm；Speed of agitator is 200-260 rpm；Fermentation period is 86-114 h.
5. elution liquid and preparation method thereof according to claim 1, it is characterized in that, the organic acid fermentation liquid of preparation is diluted into 1.5-
2.0 times, produce heavy metal-polluted soil leacheate.
6. the use of leacheate according to claim 1, it is characterized in that, by heavy-metal contaminated soil and gained leacheate according to
1:16-24 solid-to-liquid ratio（g/mL）Mixing, fully reacts in stirred tank.
7. the use of leacheate according to claim 1, it is characterized in that, the waste liquid after elution is collected, is removed using adsorbent
Heavy metal Posterior circle uses, and sorbent used is flyash.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201610460306.4A CN107541215A (en) | 2016-06-23 | 2016-06-23 | It is a kind of can place application heavy metal-polluted soil elution liquid and preparation method thereof and use |
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| CN201610460306.4A CN107541215A (en) | 2016-06-23 | 2016-06-23 | It is a kind of can place application heavy metal-polluted soil elution liquid and preparation method thereof and use |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112442379A (en) * | 2020-12-04 | 2021-03-05 | 福建龙净环保股份有限公司 | Plant-source eluting agent and preparation method and application thereof |
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- 2016-06-23 CN CN201610460306.4A patent/CN107541215A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112442379A (en) * | 2020-12-04 | 2021-03-05 | 福建龙净环保股份有限公司 | Plant-source eluting agent and preparation method and application thereof |
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Application publication date: 20180105 |