CN105084402B - Stable and harmless treatment technology for residual heavy metal in livestock excrement - Google Patents
Stable and harmless treatment technology for residual heavy metal in livestock excrement Download PDFInfo
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- CN105084402B CN105084402B CN201510488790.7A CN201510488790A CN105084402B CN 105084402 B CN105084402 B CN 105084402B CN 201510488790 A CN201510488790 A CN 201510488790A CN 105084402 B CN105084402 B CN 105084402B
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- heavy metal
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- harmless treatment
- residual heavy
- animal excrement
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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
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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
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- Treatment Of Sludge (AREA)
- Processing Of Solid Wastes (AREA)
- Fertilizers (AREA)
Abstract
The invention discloses a stable and harmless treatment technology for residual heavy metal in livestock excrement. The technology comprises the following processing steps that 1, the livestock excrement is fed in a reaction kettle after being preheated; 2, calcium oxide is put in the reaction kettle, stirred and heated; 3, when the mixture is heated to 70 DEG C to 80 DEG C, poly iron powder is put in the reaction kettle and stirred, and the temperature is kept for one hour; 4, sodium sulfide saturated solutions are sprayed in the reaction kettle, the pressure and temperature of the reaction kettle are increased, the temperature is kept for one hour, the pH value of the materials ranges from 7.5 to 9.0, then the pressure is reduced to the normal pressure, and the materials are discharged; 5, steam and odorous gas generated in the pressure reducing process are cooled and treated through gas-liquid separation, enter a washing tower to be treated and then discharged; 6, solid-liquid separation is performed on the materials discharged in the step 4, solids are treated through decomposition, and liquid is treated through anaerobic fermentation. According to the stable and harmless treatment technology for the residual heavy metal in the livestock excrement, efficient, rapid, industrialized and environmentally friendly treatment for the residual heavy metal in the livestock excrement can be achieved, the whole technological process is mechanized and fully sealed, pathogen transmission and environmental pollution caused by heavy metal are reduced, and economic and social benefits for comprehensively utilizing the livestock excrement are improved.
Description
Technical field
The invention belongs to environmental protection technical field, it is related to residual heavy metal in a kind of farm animal excrement and stablizes innoxious place
Science and engineering skill.
Background technology
With the continuous improvement of our people's living standard, to continuing to increase so that raiseeing of fowl meat, eggs and milk demand
Poultry breeding industry obtains swift and violent development；Incident is continuing to increase of farm animal excrement total amount.Farm animal excrement is through no
Evilization is processed, and becomes the valuable source of the modern organic agriculture of development and the ecological agriculture, and organic, environmental protection and ecologic planting agricultural
Sustainable development, is the requirement to new quality of the life complying fully with people.But the combined influence due to various factors, at present
Content of beary metal in livestock and poultry breeding industry Excreta remains high, and this with regard to the comprehensive control of severe jamming and impact Excreta and has
Effect utilizes, and hinders organic, environmental protection, ecology, the development of green planting agricultural.
According to country correlation fertilizer standard in regulation, the heavy metal project that must examine in fertilizer be chromium, hydrargyrum, arsenic, cadmium and
Lead.For the heavy metal standard of residual in the Excreta of country's correlation fertilizer prescribed by standard, how to carry out stablizing innoxious
Process, make heavy metal formed stablize in its natural state harmless, be insoluble in the compound that water and difficulty carry out in ecological circulation circle, from
And block the channel that heavy metal ion enters in ecologic food chain, just it is particularly important.
Content of the invention
The technical problem to be solved in the present invention be provide a kind of can efficiently, quick, industrialization, environmental protection treatment farm animal excrement
The heavy metal of middle residual, and full process stream journey mechanization and hermetically sealed, reduce pathogen transmission and environmental pollution；Improve comprehensive utilization
In the economic and social benefit of farm animal excrement, easy to operate, inexpensive farm animal excrement residual heavy metal stablize innoxious
Handling process.
The present invention is with following technical scheme solution above-mentioned technical problem:
In a kind of farm animal excrement, residual heavy metal stablizes harmless treatment process, comprises the following steps that:
(1) farm animal excrement is sent in reactor after being preheated to temperature 50 C～60 DEG C；
(2) put into the calcium oxide of material gross mass 1%～3% to reactor, be stirred continuously and heat, mixing speed 120
～160 revs/min；
(3) when the material in reactor is heated to 70 DEG C～80 DEG C, it is that 1: 1.3～1.5 inputs are poly- by throwing in coefficient k
Iron powder, throwing in coefficient k is contained heavy metal and the mass ratio of Polyferric Sulfate powder in material, is stirred continuously and keeps 70 DEG C～80 DEG C
Temperature 1 hour, 200～240 revs/min of mixing speed；
(4) spray into the sodium sulfide saturated solution of material gross mass 0.3%～2% to reactor, solution temperature controls 50
～55 DEG C, reactor is boosted to the pressure of 1.3～5 atmospheric pressure, be warmed up to 180 DEG C, keeping temperature 1 hour, period keeps
It is 6.5～8.5 that stirring keeps the ph value of material simultaneously, 200～240 revs/min of mixing speed；Then it is decompressed to normal pressure, ejection
Material；
(5) steam producing in step (4) decompression process and gas with foreign flavor after cooling, enter gas-liquid separator just fraction
From the gas after separating is through moisture catcher, then is irradiated by ultraviolet, subsequently into water scrubber, through wash solution whirlpool
After stream spray washing is processed, emptying；Wash solution is bleaching powder saturated solution, and solution temperature controls at 55～60 DEG C；
(6) material that step (4) is discharged is solid through entering together with the liquid of gas-liquid separator separates with step (5) after cooling
Liquid/gas separator carries out solid-liquid separation, and gained solid becomes thoroughly decomposed, and gained liquid anaerobic ferments.
The shell of described reactor is made using 16 manganese alloy steels；It is provided with triple stirrings, wherein one stirs again in reactor
Stirring paddle is substituted using scraper, stirring paddle, scraper and shaft are all made using austenitic stainless steel；It is provided with folder in reactor
Layer and coil pipe, material is austenitic stainless steel；Heating system is steam boiler, and operating temperature range is room temperature～250 DEG C；Instead
Kettle is answered to have water circulation refrigerating function；In reactor, preservative treatment is carried out using high temperature resistant antifouling paint, shell adopts resistance to height
Warm anti-flaming dope carries out outer preservative treatment；All outer preservative treatment is done using energy-saving coatings outside all pipelines in processing technological flow.
The calcium oxide of described step (2) passes through 3 mesh sieve choosings.
The Polyferric Sulfate powder of described step (3) puts in reactor by blower fan, and Polyferric Sulfate powder passes through 50～100 mesh sieve choosings.
The filter screen of described moisture catcher adopts 2～4 layer of 400 mesh stainless (steel) wire composition.
Described gas-liquid separator adopts cyclone separator；Solid-liquid separator, cyclone separator, moisture catcher and water scrubber
All made using 16 manganese alloy steels and inside and outside all carried out using high temperature resistant heavy anti-corrosion paint anti-corrosion；Heat exchanger adopts heat exchanger special
Coating carries out anti-corrosion.
In described step (5), wash solution can recycle, according to consumption post-bleach powder in recycling.
Device therefor all takes Lightning and static electricity protection measure.
The remarkable advantage of the present invention is: can efficiently, quick, industrialization, in environmental protection treatment farm animal excrement residual weight
Metal, and full process stream journey mechanization and hermetically sealed, reduce pathogen transmission and environmental pollution；Improve comprehensive utilization farm animal excrement
Economic and social benefit, easy to operate, inexpensive.Achieve residual heavy metal in stable harmless treatment farm animal excrement.
Brief description
Fig. 1 is present invention process schematic flow sheet.
Specific embodiment
With reference to Fig. 1 and embodiment, the present invention is further described, but does not constitute and the claims in the present invention are protected
The restriction of shield scope.
As shown in figure 1, residual heavy metal stablizes harmless treatment process in a kind of farm animal excrement, including following technique step
Rapid:
1st, discharge farm animal excrement from plant, heat exchanger 1 is entered by conveyer belt and is preheated to temperature 50 C～60 DEG C, in advance
Material after heat is sent in reactor.
2nd, by the 1%～3% of material gross mass put into in reactor through 3 mesh sieves choosing calcium oxide, in a kettle. with
200～240 revs/min are stirred continuously, and pass through heating system heats material.Carried out using high temperature resistant antifouling paint in reactor
Preservative treatment；Shell carries out outer preservative treatment using heat-resistant fireproof coating；Outside all pipelines in processing technological flow, all adopt
Energy-saving coatings do outer preservative treatment；
3rd, when the material in reactor is heated to 70 DEG C～80 DEG C, according to remaining different huge sum of moneys in farm animal excrement
Belong to content, be 1: 1.3～1.5 by throwing in coefficient k value, the Polyferric Sulfate powder through 80～100 mesh sieve choosings is put into by blower fan, throws in system
Number k value is the mass ratio of contained heavy metal and Polyferric Sulfate powder in material.With speed, 200～240 revs/min are stirred continuously material and protect
Hold 70 DEG C～80 DEG C temperature 1 hour, make Polyferric Sulfate powder and the full and uniform mixing of material, reaction.
4th, it is then sprayed into the sodium sulfide saturated solution of material gross mass 0.3%～2%, solution temperature controls 50～55
DEG C, by pressure system, reactor is boosted to the pressure of 1.3～5 atmospheric pressure, after being warmed up to 180 DEG C, keeping temperature 1 is little
When, and with speed 200～240 revs/min be kept stirring for；Material in reactor to be made keeps ph value simultaneously is 7.5～9.0.ph
Value adjustment can be carried out by spraying into ammonium sulfate saturated solution or ammonium chloride saturated solution, and solution temperature controls at 60～65 DEG C.So
After be decompressed to normal pressure, from reactor will process after material discharge.
5th, in decompression process, the steam producing and gas with foreign flavor carry out heat exchange through heat exchanger 2, after cooling, enter gas-liquid and divide
Carry out primary separation from device, the gas after separating enters back into moisture catcher and carries out the second-order separation, then shines by ultraviolet again
Enter water scrubber after penetrating, empty after bleaching powder saturated solution vortex spray washing is processed in water scrubber, solution temperature control
System is at 55～60 DEG C.Bleaching powder saturated solution as wash solution can recycle, according to consumption post-bleach powder.Gas-liquid is divided
From device and the detached liquid of moisture catcher, after precipitation, environment can be directly discharged into.
6th, the material that step (4) is discharged carries out heat exchange through heat exchanger 3, enters solid-liquid separator and carry out solid-liquid after cooling
Separate, gained solid becomes thoroughly decomposed, gained liquid anaerobic ferments.
The liquid through gas-liquid separator separates for the step (5) can also send into solid-liquid separator, and the material that step (4) is discharged
Carry out solid-liquid separation together.
The shell of described reactor is made using 16 manganese alloy steels；It is provided with triple stirrings, wherein one stirs again in reactor
Stirring paddle is substituted using scraper, stirring paddle, scraper and shaft are all made using austenitic stainless steel；It is provided with folder in reactor
Layer and coil pipe, material is austenitic stainless steel；Heating system is steam boiler, and operating temperature range is room temperature～250 DEG C；Instead
Kettle is answered also to have water cooling function.
The filter screen of described moisture catcher adopts level Four 400 mesh stainless (steel) wire to form.
Described gas-liquid separator adopts cyclone separator, solid-liquid separator, cyclone separator, moisture catcher and water scrubber
All made using 16 manganese alloy steels and equipment inside and outside all carried out using high temperature resistant heavy anti-corrosion paint anti-corrosion.Heat exchanger adopts heat exchanger
Special coating carries out anti-corrosion.
Pressure system includes screw compressor unit, pressurized tank, moisture trap, pipeline and gate valve, relief valve and number
Control sensor.All using high temperature resistant heavy anti-corrosion paint (glass flake type, stainless steel powder inside and outside pressurized tank, moisture trap, pipeline
Type and glass microsphere type) carry out anti-corrosion.
In above-mentioned technological process, all devices all use Lightning and static electricity protection measure；Design for fire protection presses petrochemical enterprise rule
Model design execution.
Residual heavy metal ion and substance ion reaction equation in farm animal excrement:
hg2++s-2=hgs
cd2++s-2=cds
pd2++s-2=pds
2as3++3s-2=as2s3
2as5++5s-2=as2s5
cr3++3oh-=cr (oh)3
Remain heavy metal ion in farm animal excrement after above-mentioned PROCESS FOR TREATMENT, i.e. chromium, hydrargyrum, arsenic, cadmium and lead, all can be with
Stablize innoxious compound form in its natural state to exist, block it and enter the approach of ecosphere and food chain, so that poultry is arranged
Let out residual heavy metal in thing to obtain stablizing harmless treatment, so that farm animal excrement resource is used effectively and be possibly realized.
The leading indicator (unit be milligrams per kilogram) of embodiment:
| Project | Quality index |
| Total arsenic (as) (in terms of drying base) | ≤15 |
| Total mercury (hg) (in terms of drying base) | ≤2 |
| Total lead (pb) (in terms of drying base) | ≤50 |
| Total cadmium (cd) (in terms of drying base) | ≤3 |
| Total chromium (cr) (in terms of drying base) | ≤150 |
Claims (8)
1. in a kind of farm animal excrement, residual heavy metal stablizes harmless treatment process it is characterised in that including following technique step
Rapid:
(1) farm animal excrement is sent in reactor after being preheated to temperature 50 C～60 DEG C；
(2) put into the calcium oxide of material gross mass 1%～3% to reactor, be stirred continuously and heat, mixing speed 120～160
Rev/min；
(3) when the material in reactor is heated to 70 DEG C ~ 80 DEG C, it is 1: 1.3～1.5 input Polyferric Sulfate powder by throwing in coefficient k
End, throwing in coefficient k is contained heavy metal and the mass ratio of Polyferric Sulfate powder in material, is stirred continuously and keeps 70 DEG C ~ 80 DEG C temperature 1
Hour, 200～240 revs/min of mixing speed；
(4) spray into the sodium sulfide saturated solution of material gross mass 0.3%～2% to reactor, solution temperature controls at 50～55 DEG C,
Reactor is boosted to the pressure of 1.3～5 atmospheric pressure, be warmed up to 180 DEG C, keeping temperature 1 hour, period is kept stirring for simultaneously
The ph value keeping material is 6.5～8.5,200～240 revs/min of mixing speed；Then it is decompressed to normal pressure, discharge material；
(5) steam producing in step (4) decompression process and gas with foreign flavor after cooling, enter gas-liquid separator primary separation,
Gas after separating is through moisture catcher, then is irradiated by ultraviolet, subsequently into water scrubber, through wash solution eddy spray
After drenching carrying out washing treatment, emptying；Wash solution is bleaching powder saturated solution, and solution temperature controls at 55～60 DEG C；
(6) material that step (4) is discharged divides through entering solid-liquid together with the liquid of gas-liquid separator separates with step (5) after cooling
Carry out solid-liquid separation from device, gained solid becomes thoroughly decomposed, gained liquid anaerobic ferments.
2. in farm animal excrement as claimed in claim 1, residual heavy metal stablizes harmless treatment process it is characterised in that institute
The shell stating reactor is made using 16 manganese alloy steels；It is provided with triple stirrings, wherein one is stirred again and replaced using scraper in reactor
For stirring paddle, stirring paddle, scraper and shaft are all made using austenitic stainless steel；It is provided with interlayer and coil pipe in reactor,
Material is austenitic stainless steel；Heating system is steam boiler, and operating temperature range is room temperature～250 DEG C；Reactor has
Water circulation refrigerating function；In reactor, preservative treatment is carried out using high temperature resistant antifouling paint, shell adopts heat-resistant fireproof coating
Carry out outer preservative treatment；All outer preservative treatment is done using energy-saving coatings outside all pipelines in processing technological flow.
3. in farm animal excrement as claimed in claim 1, residual heavy metal stablizes harmless treatment process it is characterised in that institute
The calcium oxide stating step (2) passes through 3 mesh sieve screenings.
4. in farm animal excrement as claimed in claim 1, residual heavy metal stablizes harmless treatment process it is characterised in that institute
The Polyferric Sulfate powder stating step (3) puts in reactor by blower fan, and Polyferric Sulfate powder passes through 50～100 mesh sieve screenings.
5. in farm animal excrement as claimed in claim 1, residual heavy metal stablizes harmless treatment process it is characterised in that institute
The filter screen stating moisture catcher adopts 2～4 layer of 400 mesh stainless (steel) wire composition.
6. in farm animal excrement as claimed in claim 1, residual heavy metal stablizes harmless treatment process it is characterised in that institute
State gas-liquid separator and adopt cyclone separator；Solid-liquid separator, cyclone separator, moisture catcher and water scrubber are all using 16 manganese
Steel alloy make and inside and outside all carried out using high temperature resistant heavy anti-corrosion paint anti-corrosion；Heat exchanger is prevented using heat exchanger special coating
Rotten.
7. in farm animal excrement as claimed in claim 1, residual heavy metal stablizes harmless treatment process it is characterised in that institute
State wash solution in step (5) can recycle, according to consumption post-bleach powder in recycling.
8. in farm animal excrement as claimed in claim 1, residual heavy metal stablizes harmless treatment process it is characterised in that institute
All take Lightning and static electricity protection measure with equipment.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510488790.7A CN105084402B (en) | 2015-08-11 | 2015-08-11 | Stable and harmless treatment technology for residual heavy metal in livestock excrement |
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|---|---|---|---|
| CN201510488790.7A CN105084402B (en) | 2015-08-11 | 2015-08-11 | Stable and harmless treatment technology for residual heavy metal in livestock excrement |
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| Publication Number | Publication Date |
|---|---|
| CN105084402A CN105084402A (en) | 2015-11-25 |
| CN105084402B true CN105084402B (en) | 2017-01-18 |
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|---|---|---|---|
| CN201510488790.7A Expired - Fee Related CN105084402B (en) | 2015-08-11 | 2015-08-11 | Stable and harmless treatment technology for residual heavy metal in livestock excrement |
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| CN101445250B (en) * | 2008-12-05 | 2011-06-01 | 山东师范大学 | Organic matter/mineral complex and preparation method thereof |
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Effective date of registration: 20181029 Address after: 537033 Yulin new town, Fumian District, the Guangxi Zhuang Autonomous Region Patentee after: GUANGXI YULIN DAZHI BIOTECHNOLOGY CO.,LTD. Address before: 530004 No. 100, University Road, XiXiangTang District, Nanning, the Guangxi Zhuang Autonomous Region Patentee before: Guangxi University |
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Granted publication date: 20170118 |
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