CN107631307A - A kind of sugar grass plant joint method of disposal rich in heavy metal - Google Patents
A kind of sugar grass plant joint method of disposal rich in heavy metal Download PDFInfo
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- CN107631307A CN107631307A CN201710569370.0A CN201710569370A CN107631307A CN 107631307 A CN107631307 A CN 107631307A CN 201710569370 A CN201710569370 A CN 201710569370A CN 107631307 A CN107631307 A CN 107631307A
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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
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E50/00—Technologies for the production of fuel of non-fossil origin
- Y02E50/10—Biofuels, e.g. bio-diesel
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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
- Y02P20/00—Technologies relating to chemical industry
- Y02P20/10—Process efficiency
- Y02P20/133—Renewable energy sources, e.g. sunlight
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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
- Y02P20/00—Technologies relating to chemical industry
- Y02P20/50—Improvements relating to the production of bulk chemicals
- Y02P20/59—Biological synthesis; Biological purification
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Abstract
The present invention provides a kind of combination treatment method rich in heavy metal sugar grass plant, first carrying out fermenting and producing to sweet sorghum stalk using advanced solid-state fermentation technology has the ethanol of economic value, wherein further shorten fermentation time while alcohol yied more than 90% is ensured from distinctive saccharomyces cerevisiae TSH2；Burning processing is carried out to the sweet broomcorn straw fermentation residue of caused a large amount of rich cadmiums after fermentation again, pass through the cadmium for controlling the temperature of burning to reclaim in the flying dust and clinker after burning to greatest extent, the heat energy with economic value is produced simultaneously is used for alcohol production and generating or heat supply, pass through the effective integration of solid-state fermentation technology and combustion technology, the safe disposal problem of rehabilitation plant is efficiently solved, and has economy and the feature of environmental protection concurrently.
Description
Technical field
The present invention relates to the environment remediation field in heavy metal pollution farmland, and in particular to a kind of sugar grass rich in heavy metal
Plant combines method of disposal, belongs to the comprehensive reutilization and field of environment protection of plant resources.
Background technology
Phytoremediation refers to, using the stronger plant of heavy metal accumulation ability, shift heavy metal by absorbing and transporting
And aboveground vegetation part is stored in, the purpose for reducing heavy metal content in soil, main bag are reached eventually through harvest aerial part
Include two ways：First, using the superabsorbent ability of over-accumulated plant, heavy metal in soil is extracted；It is second, fast from growing
Speed, the non-super accumulation plant extract heavy metal that biomass is larger, enriching heavy metal ability is relatively strong.
Researcher proposes the energy-source plant that plantation biological yield is high on the soil of heavy metal pollution, on the one hand realization pair
The comprehensive utilization in heavy metal pollution farmland, expands the cultivated area of energy-source plant, on the one hand produces biomass energy (such as biology combustion
Gas, bio-ethanol etc.), certain economic benefit is produced, while extraction reparation can be carried out to the heavy metal in soil, reach one
Lift multiple-effect purpose, for the structure of agricultural production by heavy metal pollution farmland, increase farmers' income, increases repair meaning and popularization model
Enclose etc. aspect play the role of it is positive.
Sugar grass (Sorghum bicolor (Linn.) Moench) has photosynthetic efficiency as important energy-source plant
The features such as height, biological yield height, strong stress resistance, wide adaptability, and there is very strong absorption energy to heavy metals such as zinc, arsenic, copper, cadmiums
Power and patience, can stalk 5-6 ton of the per mu yield containing sugared 12-14%.Therefore sweet sorghum production ethanol is considered as potential replace
For one of oil approach, ripe, with short production cycle, production cost relative moderate the advantage of its zymotechnique.
Although sugar grass can be planted on heavy metal pollution farmland, a large amount of sweet teas rich in heavy metals such as cadmiums are high
Fine strain of millet stalk fermentation residue such as early as possible, can not be disposed reasonably, it would be possible to soil is come back to, and due to the heavy metal in organism
Increase its harmfulness with higher activity so as to cause secondary pollution.At present, it is main for the method for disposal of rehabilitation plant
It is as discarded object or recycling, mainly including burning method, composting process, compression landfill method, high-temperature decomposition, plant smelting
Gold, spices extraction, bioenergy etc..
It is main to include crushing what is squeezed the juice after stalk using the comparative maturity that has developed of technology of sugar grass fermentation producing and ethanol
Liquid state fermentation mode and direct solid state fermentation mode.Although liquid state fermentation is the most frequently used method of bio-fuel ethanol, but
The shortcomings of difficult, water pollution problems is serious of squeezing the juice during sweet sorghum stalk liquid state fermentation be present, can not substantially control discharge
The micro heavy of waste water.And sugar grass solid state fermentation is ensureing that sugar grass crushed material is aqueous then by being crushed to stalk
On the premise of measuring within the specific limits, access fermentation seed liquid carries out fermentation producing and ethanol after mixing.Compared with liquid fermentation, Gu
State fermentation technique improves sugar utilization, simplifies technological process, reduces production cost, avoids the generation of a large amount of waste water.
To sum up, using energy source to sugar grass after reparation can be realized by producing ethanol, but how properly handled
The problem of sweet Chinese sorghum pole fermentation residue of caused a large amount of rich cadmiums has become a key after fermentation, while the economy of handling process
Property and development of the feature of environmental protection also to this phytoremediation technology have great importance.Therefore based on minimizing, innoxious and money
The principle in source, burning method are considered as most viable technology.
Therefore, it is necessary to a kind of safe disposal problem that can efficiently solve rehabilitation plant, while economy and ring are had concurrently
The combination treatment method rich in heavy metal sugar grass plant of guarantor property.
The content of the invention
In order to solve the above problems, at a kind of joint rich in heavy metal sugar grass plant
Reason method, using solid-state fermentation technology processing stalk production alcohol fuel, then pass through caused richness after combustion technology processing fermentation
Fermentation residue containing heavy metal, heat energy and residue and flying dust rich in heavy metal are produced, finally collect residue and flying dust is used for counterweight
Metal is reclaimed.By effective joint of two kinds of technologies with integrating, the recycling rich in heavy metal sugar grass plant is realized
With recovery energy, at the same time, the minimizing and harmless treatment of sweet sorghum stalk are realized.
Wherein described solid-state fermentation technology is used to produce alcohol fuel, its specific steps using the stalk of sugar grass as raw material
For：
1. being plant sweet sorghum in the soil of heavy metal pollution, sugar grass aerial part is obtained after ripe；
2. it will be pulverized and mixed after fresh sorgo stem leaf-peeling uniformly, it is preferable that by stalk disintegrating be diameter 1-5mm, grow
Degree is less than 50mm；
3. weighing crushed material, according to the 5-15% of crushed material quality inoculum concentration, cultured seed liquor is accessed；Its
In, inoculum concentration is determined according to factors such as the flourish of strain and fermentation efficiencies.
Preferably, the seed liquor is saccharomyces cerevisiae (Saccharomyces cerevisiae Hansen) TSH2, described
Saccharomyces cerevisiae TSH2 is that high temperature is can tolerate under the conditions of solid fermentation by special domestication, the peculiar strain of genetic modification, TSH2,
It is high-yield ethanol yeast so as to which solid fermentation efficiency is apparently higher than other industrial yeasts and absorption fermentable sugars speed is efficient
Kind, solve the problems, such as that conventional strain is directed to the fermentation heat history (high temperature) of solid fermentation, mass transfer effect difference.The wine
Brewer yeast TSH2, deposit number：CGMCC 14223, depositary institution are that China Committee for Culture Collection of Microorganisms is commonly micro-
Bio-Centers, preservation date are on 06 06th, 2017.
4. under the conditions of 30 DEG C, material described in step 3 is subjected to solid state fermentation directly in solid-state fermentation tank, that is, turned
Fermented in Drum fermentation tank, inoculum concentration is the 10% of stalk crop, and fermentation time 24h, speed of agitator, which controls, to exist
0.08rpm。
5. obtaining ethanol after slightly steaming ethanol rectifying, alcohol yied reaches more than 90%, when further effectively shortening fermentation
Between, 20h is shortened to by the 24h of prior art.
Wherein described combustion technology is used to handle sweet sorghum stalk fermentation residue and discarded object, and the combustion technology is adopted
With tube furnace combustion technology, combustion system includes air distribution system, tube furnace, flying dust collection system and smoke absorption system composition；
The air distribution system, including gas bottle, valve and gas flow meter, for controlling gas flow rate.
Preferably, the tube furnace, can be in 500-1200 as burner, furnace temperature using SK2-4-10 types high temperature process furnances
DEG C any setting is needed according to experiment.
The flying dust collection system, including filter cylinder support and the glass fiber filter cylinder that is arranged in support；In filter cylinder support
Glass fiber filter cylinder be used for be collected by filtration burning caused by flying dust.
The smoke absorption system includes a series of absorption bottles, the built-in 5%HNO of absorption bottle3+ 10%H2O2Mixing
Liquid, for absorbing gaseous heavy metal.
Wherein, combustion technology is used to be fired when ignition temperature is 900 DEG C to sweet sorghum stalk fermentation residue and discarded object
Burning processing, carries out the recovery of cadmium, concrete operation method is：
Sweet Chinese sorghum pole fermentation residue accurately is weighed, ignition temperature is arranged on 900 DEG C, makes tube furnace liter according to the program set
Temperature；Air, gas flow 5L/min are passed through when furnace temperature reaches design temperature；Then the corundum boat for filling response sample is pushed away
Enter, after stopping 30min, be allowed to react completely；After system cooling, clinker, flying dust and smoke absorption liquid are collected respectively.Burning
When temperature is 900 DEG C, cadmium content highest in flying dust, now it need to only reclaim in the part and glass fiber filter cylinder after collecting burning
Flying dust is the complete recovery that cadmium can be achieved, while saves the energy to greatest extent.
In actual production, CFBB can be selected burning processing, burning temperature are carried out to sweet Chinese sorghum pole fermentation residue
Spend for 900 DEG C when collect the residue after burning and flying dust to realize the recovery of cadmium to greatest extent；Carried out using the combustion technology
Burning before processing, it is also necessary to dewater treatment is carried out to the sweet Chinese sorghum pole fermentation residue, is contained in the sweet Chinese sorghum pole fermentation residue after distillation
Water is about 80%, and joint is carried out using heat energy caused by solar energy and burning in circulating fluid bed boiler to sweet Chinese sorghum pole fermentation residue
Drying process, water content is set to be reduced to less than 50%.
The present invention provides a kind of combination treatment method rich in heavy metal sugar grass plant, using solid-state fermentation technology to sweet tea
Sorghum Stalk, which carries out fermenting and producing, has the ethanol of economic value, wherein the distinctive saccharomyces cerevisiae TSH2 selected is ensureing ethanol
Fermentation time is further shorten while yield more than 90%；Using combustion technology to caused a large amount of rich cadmiums after fermentation
Sweet broomcorn straw fermentation residue is handled, and passes through the flying dust and clinker for controlling the temperature of burning to reclaim after burning to greatest extent
In cadmium, while produce the heat energy with economic value, the present invention by the effective integration of solid-state fermentation technology and incineration technology,
The safe disposal problem of rehabilitation plant is efficiently solved, and has economy and the feature of environmental protection concurrently.
It should be appreciated that foregoing description substantially and follow-up description in detail are exemplary illustration and explanation, should not
As the limitation to the claimed content of the present invention.
Brief description of the drawings
With reference to the accompanying drawing enclosed, the present invention more purpose, function and advantages will pass through the as follows of embodiment of the present invention
Description is illustrated, wherein：
Fig. 1 is the specific steps flow chart of combination treatment method of the present invention rich in heavy metal sugar grass plant.
Fig. 2 is the combustion curve of sweet sorghum stalk fermentation residue under 30 DEG C/min ramp rate conditions.
After Fig. 3 is different temperatures burning, residue and flying dust quality (Fig. 3 a) and its account for the percentage (Fig. 3 b) of gross mass
Change.
Fig. 4 is the Transport And Transformation feature of cadmium in combustion process, and wherein Fig. 4 a are matter of the cadmium in residue, flying dust and flue gas
Amount；Normalization distribution of Fig. 4 b cadmiums in residue, flying dust and flue gas；Fig. 4 c are the content of cadmium in residue, flying dust.
Embodiment
By reference to one exemplary embodiment, the purpose of the present invention and function and the side for realizing these purposes and function
Method will be illustrated.However, the present invention is not limited to one exemplary embodiment as disclosed below；Can by multi-form come
It is realized.The essence of specification is only to aid in the detail of the various equivalent modifications Integrated Understanding present invention.
Hereinafter, embodiments of the invention will be described with reference to the drawings.In the accompanying drawings, identical reference represents identical
Or similar part, or same or like step.
Fig. 1 is the specific steps flow chart of combination treatment method of the present invention rich in heavy metal sugar grass plant.Referring to figure
1, the present invention provides a kind of combination treatment method rich in heavy metal sugar grass plant, using without the processing of waste water solid-state fermentation technology
Stalk, alcohol fuel is obtained after thick steaming ethanol rectifying, pass through combustion technology and handle the caused fermentation for being rich in heavy metal after fermentation
Slag, the heat energy with economic value and the residue and flying dust rich in heavy metal are produced, carries out the recovery of heavy metal.Pass through two kinds of skills
Effective joint of art realizes recycling and recovery energy rich in heavy metal sugar grass plant, at the same time, in fact with integrating
The minimizing and harmless treatment of sweet sorghum stalk are showed.
The solid-state fermentation technology of the sweet sorghum stalk of embodiment 1
The cadmium concentration that sugar grass used in experiment is planted in the Cd-polluted farmland in Guangdong Shaoguan, soil is 7.93mg/kg, is had
Effect cadmium content is 2.89mg/kg, and Nutrient matter 11.3%, fresh weight is 750g/ strains.Using advanced solid fermentation (ASSF) skill
(strain is saccharomyces cerevisiae (Saccharomyces cerevisiae Hansen) for art and peculiar high temperature resistant, hypermetabolism efficiency bacterial strain
TSH2), realize in main fermentation time 20h and complete, alcohol yied more than 90%, and whole technical process is nearly free from waste water,
Effectively reduce the secondary pollution of heavy metal.
Concrete operation method is：To be pulverized and mixed after fresh sorgo stem leaf-peeling uniformly (diameter 1-5mm, length are less than
50mm), weigh 10kg crushed material, according to 10% inoculum concentration access (strain has been saccharomyces cerevisiae to cultured seed liquor
(Saccharomyces cerevisiae Hansen) TSH2), 25-35 DEG C of Preliminary fermentation temperature, it is turning for 50L to be put into capacity
Fermented in Drum fermentation tank, speed of agitator is controlled in 0.08rpm, and ferment 20h, and ethanol is obtained after distillation, and ethanol is theoretical to be received
Rate reaches more than 90%, and wherein fermentation time shortens to 20h by the 24h of prior art.
The strain used in the present embodiment be through screening, tame and genetic modification after obtain, can tolerate solid fermentation under
The characteristics of high temperature, low mass transfer rate, fermentation time is further shortened into 20h by the 24h of prior art, so as to improve fermentation effect
Rate and alcohol yied.The strain is saccharomyces cerevisiae TSH2, and deposit number is CGMCC 14223, and depositary institution is：The micro- life of China
Thing culture presevation administration committee common micro-organisms center, preservation date are on 06 06th, 2017.
The combustion technology of the sweet sorghum stalk fermentation residue of embodiment 2 and discarded object
Using tube furnace combustion technology, combustion system includes air distribution system, tube furnace, flying dust collection system and smoke absorption
System forms.Air distribution system is made up of gas bottle, valve and gas flow meter, controls gas flow rate.Tube furnace uses SK2-4-
10 type high temperature process furnances can need any setting at 500-1200 DEG C as burner, furnace temperature according to experiment.Fly caused by burning
Ash is collected by filtration by the glass fiber filter cylinder in filter cylinder support.Smoke absorption system is made up of a series of absorption bottles, and built-in 5%
HNO3+ 10%H2O2Mixed liquor, for absorbing gaseous heavy metal.
Concrete operation method is：4.000g sweet Chinese sorghum pole fermentation residues accurately are weighed, study it respectively in different ignition temperatures
The Transport And Transformation of lower cadmium, 600 DEG C, 700 DEG C, 800 DEG C, 900 DEG C, 1000 DEG C of totally 5 ignition temperatures are arranged to, according to what is set
Program makes tube furnace heat up, and air is passed through when furnace temperature reaches design temperature, gas flow 5L/min, will then fill reaction
The corundum boat push-in of sample, after stopping 30min, is allowed to react completely, after system cooling, collects clinker, flying dust and cigarette respectively
Aspiration liquid.
Using inductive coupling plasma emission spectrograph (Agilent 7700X, Agilent Technologies,
USA) the content of measure wherein cadmium.Flying dust, residue after being burnt to sweet Chinese sorghum pole fermentation residue and cofiring use micro-wave digestion (CEM-
MARS) method is cleared up, and resolution acid system is HNO3-HClO4-HF(2:2:1), digestion solution constant volume.Smoke absorption liquid sample is joined
According to the methods of EPA METHOD 29 by two bottles of 5%HNO3+ 10%H2O2Absorbing liquid is transferred in 500ml volumetric flasks, and uses constant volume.
Referring to Fig. 2-Fig. 4, Fig. 2 is under 30 DEG C/min ramp rate conditions, and the burning of sweet sorghum stalk fermentation residue is bent
Line, wherein：TGA represents the situation of change of quality, and DTG represents the first differential of Mass versus Time, DTA reflection fuel combustion process
The energy variation situation of middle fuel.As seen from the figure, the burning of sweet sorghum stalk fermentation residue can be divided into preheating and dry, volatile matter
The four-stages such as precipitation, volatile combustion, coke burning after-flame, when maximum weight loss rate is concentrated in about 350 DEG C, that is, are being waved
Send out the divided combustion stage.
Fig. 3 is the situation of change of residue and flying dust quality under different temperatures burning condition, from Fig. 3 a：With temperature
Increase, burning it is more abundant, it is in downward trend to cause the quality of residue and flying dust, from Fig. 3 b, its shared solid-like
The percentage of product dropped to by 11.2% at 600 DEG C at 900 DEG C 6.00%, this explanation after burning, sample quality is bright
It is aobvious to reduce, effectively realize the minimizing and harmless treatment of sugar grass residue.
Fig. 4 shows the Transport And Transformation feature of cadmium under different ignition temperatures.The low boiling point of cadmium, it is a kind of volatile heavy metal.
Fig. 4 a are figure-of-merit curve of the cadmium in clinker, flying dust and flue gas under different ignition temperatures, and as seen from the figure, cadmium is in residue
In quality reduced with the rise of temperature, and quality of the cadmium in flying dust then reduces again as the rise of temperature first raises,
Quality in flue gas does not change then.
Fig. 4 b are the normalized distribution of the cadmium mass change in clinker, flying dust and flue gas at different temperatures, by scheming
Understand, cadmium is mainly distributed in flying dust, and the quality in flue gas and residue is relatively low；Although cadmium is equal in bottom ash, flying dust, flue gas
It is distributed, but according to the theory of material balance, 100% recovery is can reach under different temperatures, and to the normalization of cadmium
Distribution has no significant effect.
Fig. 4 c are the content of cadmium in residue, flying dust, and as seen from the figure, content of the cadmium in residue and flying dust is with the liter of temperature
Height is in different change, and the cadmium content at 900 DEG C in residue is 2.23mg/kg, and content is up to 63.3mg/ in flying dust
kg。
In summary：Burnt at a temperature of 900 DEG C, cadmium content highest in flying dust, now need to only collect burning after residue and
Flying dust is the recovery that cadmium can be achieved, while saves the energy to greatest extent, and it also avoid burning at low temperature can produce dioxin
Problem.
In actual production, burning processing, the combustion can be carried out to sweet Chinese sorghum pole fermentation residue using CFBB
When burning temperature is 900 DEG C, the residue after burning and flying dust are collected to realize the recovery of cadmium to greatest extent, while will not be again to ring
Border pollutes.The method of the cadmium recovery is that the recovery of cadmium is realized by dump leaching method and electro-deposition techniques.
The combustion technology can effectively handle sweet sorghum stalk fermentation residue and discarded object, produce the heat with economic value
Alcohol production and generating or heat supply can be used for, can reach for the heavy metal recovery rate in residue and flying dust rich in heavy metal
100%, in actual production, in the case of ensureing that sweet sorghum stalk fermentation residue is clean-burning, when ignition temperature is 900 DEG C,
Cadmium reclaims completely, while saves the energy to greatest extent；The minimizing and harmless treatment of sweet sorghum stalk are realized, at the same it is also real
Recycling and recovery energy rich in heavy metal sugar grass plant are showed.
The invention reside in a kind of combination treatment method rich in heavy metal sugar grass plant is provided, realize to rich in heavy metal
The safe disposal of sugar grass plant, specific method are the second for having economic value using solid-state fermentation technology processing stalk
Alcohol, then by combustion technology handle fermentation after caused by be rich in heavy metal fermentation residue, produce with economic value heat energy and
Residue and flying dust available for extraction heavy metal.By effective joint of two kinds of technologies with integrating, realize rich in heavy metal sweet tea
The recycling and recovery energy of sorghum plant, at the same time, realize the minimizing and harmless treatment of sweet sorghum stalk.
With reference to the explanation of the invention disclosed here and practice, other embodiment of the invention is for those skilled in the art
It all will be readily apparent and understand.Illustrate and embodiment is to be considered only as exemplary, of the invention true scope and purport is equal
It is defined in the claims.
Claims (8)
1. a kind of combination treatment method rich in heavy metal sugar grass plant, stem is handled using the solid-state fermentation technology without waste water
Stalk, alcohol fuel is obtained after thick steaming ethanol rectifying, after the caused fermentation residue rich in heavy metal carries out dewater treatment after fermentation
Handled using combustion technology, produce heat energy and residue and flying dust containing heavy metal, the residue finally collected and flying dust are used
Extracted in heavy metal recovery.
2. combination treatment method according to claim 1, described using the tool without waste water solid-state fermentation technology processing stalk
Body step is：
Step 1, plant sweet sorghum in the soil of heavy metal pollution, sugar grass aerial part is obtained after ripe；
Step 2, it will be pulverized and mixed after fresh sorgo stem leaf-peeling uniformly, be diameter 1-5mm by stalk disintegrating, length is less than
50mm；
Step 3, crushed material is weighed, according to the 5-15% of crushed material quality inoculum concentration, access cultured seed liquor；
Step 4, under the conditions of 30 DEG C, material described in step 3 is subjected to solid state fermentation directly in solid-state fermentation tank, that is, existed
Fermented in rotary drum fermentation tank, inoculum concentration is the 10% of stalk crop, and fermentation time 20h, speed of agitator, which controls, to exist
0.08rpm；
Step 5, ethanol is obtained after thick steaming ethanol rectifying, alcohol yied reaches more than 90%.
3. combination treatment method according to claim 2, in step 3, the seed liquor is saccharomyces cerevisiae TSH2, protect
Hide numbering：CGMCC 14223, depositary institution are China Committee for Culture Collection of Microorganisms's common micro-organisms center, preservation
Date is on 06 06th, 2017.
4. combination treatment method according to claim 1, the combustion technology uses tube furnace combustion technology, its system of burning
System includes air distribution system, tube furnace, flying dust collection system and smoke absorption system composition；
The air distribution system, including gas bottle, valve and gas flow meter, for controlling gas flow rate；
The tube furnace, can be in 500-1200 DEG C of any setting as burner, furnace temperature using SK2-4-10 types high temperature process furnances；
The flying dust collection system, including filter cylinder support and the glass fiber filter cylinder that is arranged in support；Glass in filter cylinder support
Glass fiber filter cylinder is used to flying dust caused by burning be collected by filtration；
The smoke absorption system includes a series of absorption bottles, the built-in 5%HNO of absorption bottle3+ 10%H2O2Mixed liquor, use
In the gaseous heavy metal of absorption.
5. combination treatment method according to claim 4, the combustion technology is used when ignition temperature is 900 DEG C, it is right
Sweet sorghum stalk fermentation residue and discarded object carry out burning processing, carry out the recovery of cadmium, and concrete operation method is：
Sweet Chinese sorghum pole fermentation residue accurately is weighed, ignition temperature is arranged on 900 DEG C, tube furnace is heated up according to the program set；
Air, gas flow 5L/min are passed through when furnace temperature reaches design temperature；Then the corundum boat for filling response sample is pushed into,
After stopping 30min, it is allowed to react completely；After system cooling, clinker, flying dust and smoke absorption liquid are collected respectively；In burning temperature
Spend for 900 DEG C when, cadmium content highest in flying dust, collects residue and flying dust is used for heavy metal cadmium recovery extraction.
6. combination treatment method according to claim 1, the combustion technology is from CFBB to sugar grass
Bar fermentation residue carries out burning processing, and the residue after burning and flying dust are collected when ignition temperature is 900 DEG C to realize cadmium to greatest extent
Recovery.
7. combination treatment method according to claim 6, the combustion technology carries out burning before processing, and joint uses the sun
Dewater treatment can be carried out to sweet Chinese sorghum pole fermentation residue with heat energy caused by burning in circulating fluid bed boiler, make water content from 80% drop
It is low to less than 50%.
8. the combination treatment method according to claim 5 or 6, method that the heavy metal cadmium recovery uses for dump leaching method with
Electro-deposition techniques.
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|---|---|---|---|---|
| WO2020000372A1 (en) * | 2018-06-29 | 2020-01-02 | 清华大学 | Combined treatment method for sorghum bicolor (linn.) moench plants rich in heavy metals |
| CN115007638A (en) * | 2022-05-24 | 2022-09-06 | 清华大学 | Method for sustainably repairing saline-alkali soil containing cadmium by utilizing energy plant sweet sorghum and derivative products thereof |
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| CN107631307B (en) | 2019-09-27 |
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