CN104926167B - Method for consolidating waste incineration fly ash heavy metal through microorganism cement mineralization - Google Patents
Method for consolidating waste incineration fly ash heavy metal through microorganism cement mineralization Download PDFInfo
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- CN104926167B CN104926167B CN201510260547.XA CN201510260547A CN104926167B CN 104926167 B CN104926167 B CN 104926167B CN 201510260547 A CN201510260547 A CN 201510260547A CN 104926167 B CN104926167 B CN 104926167B
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- incineration
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Abstract
The invention discloses a method for consolidating waste incineration fly ash heavy metal through microorganism cement mineralization. Through the method disclosed by the invention, microorganism cement is obtained and a microorganism cement bonded product, namely calcite, is obtained, and the calcite is used for consolidating waste incineration fly ash according to the method. A consolidated product formed by consolidating the waste incineration fly ash with the method is low in heavy metal leaching and high in stability of induration, and can be used as a building material.
Description
Technical field
The present invention relates to a kind of flyash treatment method for waste incineration, consolidate rubbish particularly to a kind of microorganism cement mineralising
Incinerating flyash, heavy metal method, belongs to field of environment engineering,
Background technology
Currently, the Chinese city that there are about more than 1/3 is absorbed in the predicament of " garbage-surrounded city ", and China's domestic waste produces
Output is still continually incremented with the speed in year 8～10%.For solving the problems, such as " garbage-surrounded city ", country adopts rubbish one after another both at home and abroad
Incineration technology carries out garbage disposal, the method due to the volume reduction rate of rubbish 90%, 70～80% weight-loss ratio can be realized, simultaneously
In waste incineration produce heat energy also recoverable the advantages of and become important research and the developing direction of garbage disposal.
Although garbage incineration technology maximizing volume reduction, decrement, burn after still can produce former garbage weight 10～
20% flying dust.Incineration of refuse flyash, due to being enriched volatilization state pb, cd, the heavy metal such as zn, cu of higher concentration, is generally considered
It is a kind of hazardous waste.Therefore, certain technical measures need to be taken effectively to dispose flying dust, make up to Non-toxic, volume reduction and
The purpose of resource, with the secondary pollution avoiding waste incineration to produce.
Cement concretion technology because its simple process, the advantage such as cheap and become domestic and international and process incineration of refuse flyash weight
The commonly used method of metal.Its technical process is to mix flying dust and cement by a certain percentage, adds a certain amount of water to be formed
Hard cement induration, to reduce the Leaching of fly-ash heavy metal.Although domestic and international research institution consolidates flying dust to cement
The research of technology achieves a series of achievements and major application progress, but (volume is about 60% to there are still cement consumption height
Left and right), increase-volume, weightening are than big it is impossible to the flying dust of increasingly increase of dissolving for a long time.In addition, the villaumite containing in flying dust, heavy metal from
Son can produce impact to the condensation firm time of cement induration, thus reducing flying dust concretion body strength, and then leads to induration
Rupture and make the further dissolution of heavy metal ion, the problems such as cause environment to pollute again.
The problem present situation existing for above-mentioned cement concretion technology, inventor based on oneself abundant practical experience,
Again through substantial amounts of verification experimental verification, have developed one kind and can improve incineration of refuse flyash consolidation efficiency, reduce Leaching of Heavy Metals
Rate, improve induration stability, but can reduce use or do not use traditional portland, can to reduce induration volume swollen simultaneously
Swollen new method.
Content of the invention
Present invention aim at providing a kind of low environment pollution, low consumption of resources, inexpensive microorganism cement mineralising solid
Knot incineration of refuse flyash heavy metal method, the last consolidation thing producing of this method, Leaching of Heavy Metals is low, induration stability high.
The object of the invention is achieved through the following technical solutions: inclusion step:
1) prepare microorganism cement:
A. prepare Bacillus pasteurii bacterium solution: Bacillus pasteurii is inoculated into the mixing of soy peptone and casein peptone
In culture medium, culture medium every liter of soybean protein-containing peptone 3～7g, casein peptone 13～15g；Control ph 6～8, in 30～37 DEG C,
Under rotating speed 160～180r/min, cultivate 16～24 hours, obtain Bacillus pasteurii bacterium solution；
B. compound concentration is the carbamide-calcium source mixed solution of 1mol/l；
It is water according to mass ratio: carbamide=1:0.04～0.08；Water: the ratio of calcium source=1:0.45～0.55 takes each group
Point；Taken carbamide and calcium source are put in water, stirring and dissolving, mixing.
C. take Bacillus pasteurii bacterium solution and 1mol/l carbamide-calcium source mixed solution, the mix homogeneously of same volume, obtain final product
Microorganism cement.
This microorganism cement can increase with the prolongation of standing time, the solid agglutinate calcite of appearance.
2) separate agglutinate calcite:
Will be in step 1) the microorganism cement that obtains, filters after placing 4～8 hours at room temperature, gained solid matter is
For microorganism cementing product calcite；Dry, standby；
3) consolidate incineration of refuse flyash:
It is calcite according to mass ratio: the ratio of incineration of refuse flyash=1:2～5, weigh calcite respectively and rubbish burns
Burn flying dust, by their mix homogeneously, and the mixing that adds water makes it become pureed.Maintenance 3～7 days under the conditions of being subsequently placed in 25 DEG C, the demoulding,
Incineration of refuse flyash is consolidated.
In the preparation of described microorganism cement calcium source used can be one of calcium chloride, calcium nitrate, calcium bromide or they
Mixture.
In order to obtain more preferable effect, when compound concentration is the carbamide-calcium source mixed solution of 1mol/l, preferably press with the following group
Divide and proportions: add 60 grams of carbamide, 111 grams of calcium chloride, 200 grams of calcium bromide, 165 grams of calcium nitrates in 1 liter of water, stirring is molten
Solution, mixes.
Advantages of the present invention and feature:
1. can be prevented effectively from conventional cement consolidation method that the induration stability often occurring is poor, increase-volume weightening is than big, one-tenth
This height, the problems such as environmental pollution.Compared with conventional cement consolidation method, the present invention does not use cement, but using in nature
The microbial resources being widely present, the calcite mineralising consolidation flying dust being formed using its mineralising, and by the huge sum of money containing in flying dust
Belong to ion consolidation closing.Both enclosed the pollutant in flying dust, be not in the pollution producing because preparing cement again.
2. with this method, incineration of refuse flyash heavy metal is carried out with mineralising consolidation, gained consolidation thing comprcssive strength is high, metal
Leaching concentration is extremely low, can be used for preparing building materials.
The content of representative heavy metal pb, zn, cu, cd and cr in conventional rubbish flying ash, by horizontal vibration method, its
Leaching concentration in pure water be typically respectively 6～9mg/l, 109～120mg/l, 120～170mg/l, 1.10～1.90mg/l and
17.23～30.15mg/l, defined standard limited value in remote super-ego state " danger wastes Leaching standard ".
3. the villaumite that contains in incineration of refuse flyash, heavy metal ion etc. have an impact to traditional cements setting time, and this
There is not this in inventive method, thus improve heavy metal consolidation efficiency, it is to avoid secondary environmental pollution.
Brief description
Fig. 1: microorganism cement mineralising consolidates incineration of refuse flyash design sketch.
Specific embodiment
Bacillus pasteurii used by the present invention derives from german collection of microorganisms and
Cell cultures (dsmz), code is 33.
Embodiment 1
The incineration of refuse flyash collected from certain coal-burning power plant, its representative heavy metal pb, zn, cu, cd and cr after measured
Leaching concentration in pure water is respectively 9.34mg/l, 118.51mg/l, 167.34mg/l, 1.14mg/l and 25.54mg/l.
1. prepare microorganism cementing material calcite first:
Bacillus pasteurii is inoculated in the mixed culture medium that soy peptone is with casein peptone, every liter of culture medium contains big
Soybean protein peptone 3～7g, casein peptone 13～15g；Control ph 6～8, under 30～37 DEG C, rotating speed 160～180r/min, training
Support 16～24 hours, obtain Bacillus pasteurii bacterium solution.
Separately take, carbamide 180,333 grams of calcium chloride, 600 grams of calcium bromide, 495 grams of calcium nitrate, put into dissolving in 3 liters of water, mix
Even, obtain the carbamide-calcium source mixed solution of 1mol/l.
Take Bacillus pasteurii bacterium solution and each 0.5 liter of 1mol/l carbamide-calcium source mixed solution, mixing, stir, obtain micro-
Biological cement.Gained microorganism cement is placed 6 hours at room temperature, filters, gained solidss are microorganism cementing
Material calcite, dries, standby；
2. consolidate incineration of refuse flyash with microorganism cementing material calcite: weigh microorganism cementing material side
Solution stone 8g, incineration of refuse flyash 40g, water 30g, calcite and incineration of refuse flyash are homogenously mixed together, in 25 DEG C of conditions
Lower maintenance 3 days, the demoulding, dry.
Test its comprcssive strength, result is 1.5mpa.By horizontal vibration method test its representative heavy metal pb, zn, cu, cd and
Leaching concentration in pure water for the cr, result be respectively 2.38mg/l, 43.28mg/l, 52.37mg/l, 0.78mg/l and
12.34mg/l, is below defined standard limited value in China's " danger wastes Leaching standard ".
Embodiment 2
The incineration of refuse flyash collected from certain coal-burning power plant, its representative heavy metal pb, zn, cu, cd and cr in pure water
In leaching concentration be respectively 7.24mg/l, 112.11mg/l, 137.14mg/l, 1.43mg/l and 18.97mg/l.
Prepare microorganism cementing material calcite by embodiment 1.
Take microorganism cementing material calcite 16g, incineration of refuse flyash 40g, water 40g, then by calcite and rubbish
Rubbish flying ash stirs, maintenance 5 days under the conditions of 25 DEG C, the demoulding, dries.
Test its comprcssive strength, result is 2.7mpa.Test leaching in pure water for its representative heavy metal by horizontal vibration method
Go out concentration, they are respectively 1.52mg/l, 38.82mg/l, 32.78mg/l, 0.62mg/l and 10.91mg/l, are below China
Defined standard limited value in " danger wastes Leaching standard ".
Embodiment 3
The incineration of refuse flyash collected from certain coal-burning power plant, its representative heavy metal pb, zn, cu, cd and cr in pure water
In leaching concentration be respectively 8.48mg/l, 115.43mg/l, 142.36mg/l, 1.62mg/l and 28.68mg/l.
Prepare microorganism cementing material calcite by embodiment 1.
Weigh microorganism cementing material calcite 24g, incineration of refuse flyash 40g, water 50g, then by calcite and
Incineration of refuse flyash stirs, maintenance 7 days under the conditions of 25 DEG C, the demoulding, dries.
Test its comprcssive strength, result is 3.3mpa.Test leaching in pure water for its representative heavy metal by horizontal vibration method
Go out concentration, they are respectively 1.21mg/l, 37.24mg/l, 28.98mg/l, 0.72mg/l and 11.23mg/l, are below China
Defined standard limited value in " danger wastes Leaching standard ".
Claims (2)
1. a kind of microorganism cement mineralising consolidates the method for incineration of refuse flyash heavy metal it is characterised in that including step:
1) prepare microorganism cement:
A. prepare Bacillus pasteurii bacterium solution: Bacillus pasteurii is inoculated into the mixed culture of soy peptone and casein peptone
In base, culture medium every liter of soybean protein-containing peptone 3～7g, casein peptone 13～15g；Ph is controlled to be 6～8, in 30～37 DEG C, rotating speed
Under 160～180r/min, cultivate 16～24 hours, obtain Bacillus pasteurii bacterium solution；
B. compound concentration is the carbamide-calcium source mixed solution of 1mol/l；
It is water according to mass ratio: carbamide=1:0.04～0.08, water: the ratio of calcium source=1:0.45～0.55, take each component；Will
Taken carbamide and calcium source are put in water, stirring and dissolving, mixing；
C. take above-mentioned Bacillus pasteurii bacterium solution and 1mol/l carbamide-calcium source mixed solution, the mix homogeneously of same volume, obtain micro-
Biological cement；
2) separate agglutinate calcite:
By step 1) the microorganism cement that obtains, filters after placing 4～8 hours at room temperature, gained solid matter is micro- life
Thing cementing product calcite；Dry, standby；
3) consolidate incineration of refuse flyash:
It is calcite according to mass ratio: the ratio of incineration of refuse flyash=1:2～5, weigh calcite respectively and waste incineration flies
Ash, by their mix homogeneously, and the mixing that adds water makes it become pureed；Maintenance 3～7 days under the conditions of being subsequently placed in 25 DEG C, the demoulding, i.e. shape
Become consolidation thing, incineration of refuse flyash is consolidated；
In the preparation of described microorganism cement, calcium source used can be one of calcium chloride, calcium nitrate, calcium bromide or theirs is mixed
Compound.
2. the method that a kind of microorganism cement mineralising according to claim 1 consolidates incineration of refuse flyash heavy metal, it is special
Levy when being carbamide-calcium source mixed solution that compound concentration is 1mol/l, prepare by the following method: in every liter of water, add 60 grams of urine
Element, 111 grams of calcium chloride, 200 grams of calcium bromide, 165 grams of calcium nitrates, stirring and dissolving, mixing.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105268727B (en) * | 2015-11-25 | 2018-06-19 | 浙江理工大学 | The method for realizing incineration of refuse flyash reunionization is acted on using microbial mineralization |
| CN106111659A (en) * | 2016-06-22 | 2016-11-16 | 浙江理工大学 | Utilize the method that bacillus firmus reduces incineration of refuse flyash Leaching |
| CN107487997B (en) * | 2017-08-21 | 2020-04-21 | 南京林业大学 | Red mud treatment method |
| CN107540338A (en) * | 2017-09-22 | 2018-01-05 | 南京林业大学 | A kind of preparation method of cinder from refuse incineration microorganism brick |
| CN107558503A (en) * | 2017-10-13 | 2018-01-09 | 南京林业大学 | A kind of refuse landfill pad and construction method using cinder from refuse incineration |
| CN107597817B (en) * | 2017-10-27 | 2020-11-10 | 南京林业大学 | Method for solidifying and stabilizing domestic garbage incineration fly ash by microorganisms |
| CN108191400B (en) * | 2018-04-10 | 2020-08-28 | 常德东旺建材科技有限责任公司 | Preparation method of industrial slag-based sintered brick |
| CN109174906B (en) * | 2018-08-31 | 2021-04-27 | 浙江理工大学 | Device and method for solidifying fly ash |
| CN109485367B (en) * | 2019-01-07 | 2020-12-22 | 中南大学 | Preparation method and application of phosphogypsum filling body |
| CN112374844A (en) * | 2020-10-27 | 2021-02-19 | 广州市净水有限公司 | Process for preparing biological bricks by recycling municipal domestic sludge incineration ash |
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| JP2006326462A (en) * | 2005-05-25 | 2006-12-07 | Unitika Ltd | Method for recycling ash as cement raw material |
| CN101270369A (en) * | 2008-05-06 | 2008-09-24 | 清华大学 | Microorganism cause concrete or concrete, producing method and application thereof |
| TWI472356B (en) * | 2010-09-24 | 2015-02-11 | Univ Nat United | Method for quickly removing hazardous matters from mswi fly ash |
| CN103820123A (en) * | 2014-01-28 | 2014-05-28 | 东南大学 | Microbial sand-fixing dust depressor and preparation method thereof |
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