CN102643003B - Method and device for treating sludge in sewage treatment plant - Google Patents
Method and device for treating sludge in sewage treatment plant Download PDFInfo
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- CN102643003B CN102643003B CN2012101101180A CN201210110118A CN102643003B CN 102643003 B CN102643003 B CN 102643003B CN 2012101101180 A CN2012101101180 A CN 2012101101180A CN 201210110118 A CN201210110118 A CN 201210110118A CN 102643003 B CN102643003 B CN 102643003B
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- hot water
- dehydration
- sludge
- evaporation device
- water boiler
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- 239000010802 sludge Substances 0.000 title claims abstract description 38
- 238000000034 method Methods 0.000 title claims abstract description 24
- 239000010865 sewage Substances 0.000 title claims abstract description 20
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 151
- 230000018044 dehydration Effects 0.000 claims abstract description 57
- 238000006297 dehydration reaction Methods 0.000 claims abstract description 57
- 238000001704 evaporation Methods 0.000 claims abstract description 53
- 230000008020 evaporation Effects 0.000 claims abstract description 52
- 239000001301 oxygen Substances 0.000 claims abstract description 24
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 24
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims abstract description 23
- CSCPPACGZOOCGX-UHFFFAOYSA-N Acetone Chemical compound CC(C)=O CSCPPACGZOOCGX-UHFFFAOYSA-N 0.000 claims description 24
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 24
- 239000007788 liquid Substances 0.000 claims description 24
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims description 6
- 239000003546 flue gas Substances 0.000 claims description 6
- 239000000779 smoke Substances 0.000 abstract 1
- 238000010438 heat treatment Methods 0.000 description 12
- 238000009835 boiling Methods 0.000 description 6
- 230000007613 environmental effect Effects 0.000 description 6
- 239000007789 gas Substances 0.000 description 6
- 239000000126 substance Substances 0.000 description 5
- 238000009834 vaporization Methods 0.000 description 5
- 230000008016 vaporization Effects 0.000 description 5
- 230000003139 buffering effect Effects 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 239000010801 sewage sludge Substances 0.000 description 3
- 230000015556 catabolic process Effects 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 238000006731 degradation reaction Methods 0.000 description 2
- 239000002957 persistent organic pollutant Substances 0.000 description 2
- 238000004064 recycling Methods 0.000 description 2
- 244000052616 bacterial pathogen Species 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000000711 cancerogenic effect Effects 0.000 description 1
- 231100000315 carcinogenic Toxicity 0.000 description 1
- 238000009264 composting Methods 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 230000003203 everyday effect Effects 0.000 description 1
- 238000000855 fermentation Methods 0.000 description 1
- 230000004151 fermentation Effects 0.000 description 1
- 239000012467 final product Substances 0.000 description 1
- 239000000796 flavoring agent Substances 0.000 description 1
- 235000019634 flavors Nutrition 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 239000003517 fume Substances 0.000 description 1
- 229910001385 heavy metal Inorganic materials 0.000 description 1
- 238000000703 high-speed centrifugation Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000002906 microbiologic effect Effects 0.000 description 1
- 231100000614 poison Toxicity 0.000 description 1
- 230000007096 poisonous effect Effects 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- 238000004065 wastewater treatment Methods 0.000 description 1
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Classifications
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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
- Y02E20/00—Combustion technologies with mitigation potential
- Y02E20/34—Indirect CO2mitigation, i.e. by acting on non CO2directly related matters of the process, e.g. pre-heating or heat recovery
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- Treatment Of Sludge (AREA)
Abstract
The invention relates to a method for treating sludge in a sewage treatment plant, which comprises the following steps of: (a) reducing the moisture content of the sludge to 20 to 40 percent by utilizing an evaporation dehydration device; (b) delivering the dehydrated sludge into a hot water boiler to be burned with enriched oxygen; (c) delivering the hot water inside the hot water boiler into the evaporation dehydration device to be used for dehydrating of the sludge; and (d) returning the water flowing from the evaporation dehydration device into the hot water boiler. The invention also relates to a device for treating the sludge, which comprises an evaporation dehydration device and a hot water boiler which is connected with the evaporation dehydration device, wherein the hot water boiler is connected with an enriched-oxygen machine, and the evaporation dehydration device and the hot water boiler form a water circulating system. According to the method and the device, the evaporated sludge is used for being burned, the heat produced by burning the sludge is used for evaporating the moisture in the sludge, so that the expense and secondary pollution problems produced by the transportation of the sludge can be avoided, and the cost is low; and oxygen is introduced when the sludge is burned, so that the burning is more adequate, and the smoke can be ensured to exhaust after reaching the standard and the burning treatment can be ensured to implement successfully.
Description
Technical field
The present invention relates to the sludge treatment environmental technology field, relate in particular to treatment unit and the method for sludge of sewage treatment plant.
Background technology
In the municipal sewage plant, sewage is able to qualified discharge through microbiological treatment, and a large amount of organic pollutants that originally contain in sewage are by enrichment, concentrated and then formation mud.Municipal sludge contains a large amount of organic pollutants, contains simultaneously the potential poisonous and harmful elements such as pathogenic bacteria, heavy metal, carcinogenic chemical, is the topmost potential secondary pollution source that sewage treatment process forms.
In early stage construction of wastewater treatment plant, generally the sludge treatment unit is simplified and built, what have omits the sludge treatment unit even fully, and some Sewage Plant is in order to save working cost, and is even that built sludge treatment facility is on the shelf for a long time.Along with the quickening of urbanization process, the municipal sewage treatment amount increases substantially.According to the Environmental Protection Department recent statistics, the town sewage treatment facility that has put into operation by China in 2007 reaches 1178, general design processing power 7,243 ten thousand ton per days, and dispose of sewage 5,320 ten thousand tons average every day.Estimation accordingly, the whole nation produced approximately 1,460 ten thousand tons of (mud cakes: 80% water ratio) of mud in 2007.Growing with each passing day of sludge creation amount forms sharp-pointed contradiction with the wretched insufficiency of sludge treatment ability, the serious backwardness of processing means, a large amount of wet mud is arbitrarily transported outward, simply landfill or stacking, cause many cities the phenomenon in " mud besieged city " to occur, the sludge treatment problem has become the Urban Environmental Problem that China can't avoid.
At present, both at home and abroad processing, the disposal of this type of mud are adopted more: natural drying, powerful extruding or high speed centrifugation, high temperature evaporation, the methods such as chemistry or biochemical degradation are carried out processed; The methods such as landfill, burning, fermentation composting, roasting material of construction, high temperature cabonization are dissolved, recycling treatment.But these methods exist all that dewatering efficiency is low, equipment price is expensive and running cost is crossed the shortcomings such as high, and some mud adopts the degradation treatment that alkalizes just to be easy to produce serious Re-pollution in the recycling treatment process.
Summary of the invention
The invention reside in and provide that a kind of technique is simple, environmental protection, the thermal source utilization is reasonable, cost is low sludge of sewage treatment plant treatment unit and method.
Concrete technical scheme of the present invention is as follows:
A kind of sludge of sewage treatment plant treatment process comprises the steps:
A) utilize the dehydration by evaporation device that mud is dewatered, make the water content of mud be reduced to 20-40%;
B) mud after dewatering is delivered in hot water boiler, passes into oxygen in hot water boiler, and mud is oxygen-enriched combusting in hot water boiler, and the flue gas after burning and residue are discharged;
C) hot water flow in hot water boiler is used for the dehydration of mud to the dehydration by evaporation device;
D) water that flows out from the dehydration by evaporation device is back in hot water boiler.
In order to make the water that enters or flow out in the dehydration by evaporation device can access buffering, the hot water flow in step c) in hot water boiler is to hot water storage pond, and the hot water flow in hot water storage pond is used for the dehydration of mud to the dehydration by evaporation device; The water that flows out from the dehydration by evaporation device in step d) is back in hot water boiler after hot water is store the pond.
Step b) oxygen in is provided by the oxygen enricher of oxygen concentration for 28-30%.
The dehydration by evaporation device comprises hot water in hot-water line and ethanol or the acetone of submergence hot-water line.During use, hot water in hot-water line is with ethanol or acetone heating, because the boiling point of ethanol or acetone is lower, vaporization forms gas when the temperature of ethanol or acetone reaches boiling point, and ethanol or acetone are phase-changed into the mud that the top that rises to device for storing liquid after gas transfers heat to the device for storing liquid outside surface and dewater; Increased heat and mud contact area, improved the utilization ratio of heat, saved the energy.
The invention still further relates to a kind of device of realizing above-mentioned sludge of sewage treatment plant treatment process, comprise dehydration by evaporation device, the hot water boiler that is connected with the dehydration by evaporation device, hot water boiler is connected with oxygen enricher, and dehydration by evaporation device and hot water boiler consist of water circulation system.
In order to make the water that enters or flow out in the dehydration by evaporation device can access buffering, also be provided with hot water and store the pond, being connected with hot water boiler and connecting and consist of water circulation system in dehydration by evaporation device, hot water storage pond, enters the dehydration by evaporation device for the dehydration of mud from hot water boiler hot water out after the buffering of hot water storage pond.
As improvement, the hot-water line that described dehydration by evaporation device is provided with device for storing liquid and runs through device for storing liquid.
The present invention can carry out on the spot sludge incineration and process in sewage work, mud after dehydration by evaporation device dehydration by evaporation is sent in hot water boiler and is burned, burning the flue gas and the residue that produce gets rid of from hot water boiler, utilize the water in the heat heat hot water boiler that sludge incineration produces, the hot water of hot water boiler enters the moisture that is used for the evaporation mud of mud in the dehydration by evaporation device, avoid transporting expense and the secondary pollution problem of generation, utilize hot water circulation that resource is fully used; For low, the nonflammable problem of sludge calorific value, pass into oxygen by oxygen enricher during sludge incineration during burning, make burning more abundant, avoided the production due to the insufficient obnoxious flavour of burning, guarantee carrying out smoothly of flue gas qualified discharge standard and burn processing.Technique of the present invention is simple, environmental protection, the thermal source utilization is reasonable, cost is low.
Description of drawings
Fig. 1 is the structural representation of equipment therefor of the present invention;
Fig. 2 is process flow sheet of the present invention.
Wherein: 1 is the dehydration by evaporation device, and 2 is hot water boiler, and 3 is oxygen enricher, and 4 are hot water storage pond, and 5 is device for storing liquid, and 6 is the first hot-water line, and 7 is the second hot-water line, and 8 is the 3rd hot-water line, and 9 is the 4th hot-water line.
Embodiment
Further illustrate the present invention below in conjunction with accompanying drawing.
Referring to Fig. 1, sludge of sewage treatment plant treatment unit of the present invention, comprise that dehydration by evaporation device 1, dehydration by evaporation device 1 store pond 4 by the first hot-water line 6 with the 4th hot-water line 9 and hot water and be connected, hot water storage pond 4 is connected with hot water boiler 2 with the 3rd hot-water line 8 by the second hot-water line 7, described hot water boiler 2 adopts existing hot water boiler, and water bath 2 is connected with oxygen enricher 3.The first hot-water line 6 that dehydration by evaporation device 1 comprises device for storing liquid 5 and runs through device for storing liquid 5.mud after 1 dehydration of dehydration by evaporation device burns in hot water boiler 2, water in the heat heat hot water boiler 2 that produces, hot water in hot water boiler 2 flows into hot water by the second hot-water line 7 and stores pond 4, the hot water in hot water storage pond 4 flows into by the first hot-water line 6 liquid that is used for heating device for storing liquid 5 in dehydration by evaporation device 1, the water that flows out from dehydration by evaporation device 1 flows back to hot water storage pond 4 by the 4th hot-water line 9, hot water return in hot water storage pond 4 continues heating to hot water boiler 2, hot water after heating is continuously introduced to hot water and stores pond 4, dehydration by evaporation device 1, consist of water circulation system between hot water storage pond 4 and hot water boiler 2.
Referring to Fig. 2, when adopting said apparatus work, utilize in dehydration by evaporation device 1 ethanol or acetone in the hot water heating device for storing liquid 5 in the first hot-water line 6, in device for storing liquid 5, ethanol or acetone are advisable with submergence the first hot-water line 6, hot water in the first hot-water line 6 is with the ethanol in device for storing liquid 5 or acetone heating, vaporization forms gas when the temperature of ethanol or acetone reaches boiling point, and ethanol or acetone are phase-changed into the mud that the top that rises to device for storing liquid after gas transfers heat to the device for storing liquid outside surface and dewater; Make the water content of mud be reduced to 20-40%; Mud after dehydration is delivered in hot water boiler 2, the oxygen enricher 3 that is 28-30% by oxygen concentration passes into oxygen toward hot water boiler 2, mud is at 2 li oxygen-enriched combustings of hot water boiler, flue gas after burning and residue are discharged from fume emission mouth and residue discharge outlet, water in the heat heat hot water boiler 2 that produces, hot water flow in hot water boiler 2 is to hot water storage pond 4, and the hot water flow in hot water storage pond 4 is used for the dehydration of mud to the dehydration by evaporation device 1; The hot water that flows out from dehydration by evaporation device 1 is back to after hot water is store pond 4 and continues heating in hot water boiler 2, hot water after heating continues to flow to hot water and stores in pond 4, hot water flow in hot water storage pond 4 is used for the dehydration of mud to the dehydration by evaporation device 1, consists of hot water circulation.
Dehydration by evaporation device of the present invention is preferably the floor heating technology, build within doors the floor heating terrace at ventilating house, the hot-water line that is provided with device for storing liquid and runs through device for storing liquid below terrace, for the contact area that increases heat and mud, the utilization ratio that improves heat, device for storing liquid is preferably cuboid, and it is thick that the mud that will wet is tiled on the floor heating terrace 20cm, stirs in good time, keep floor heating terrace temperature 50 C, moisture percentage in sewage sludge was up to standard in about 8 hours.
Selection by liquid substance in device for storing liquid needs to select according to practical situation, it is to utilize liquid substance to be vaporized into gas that the present invention uses the purpose of this liquid substance, utilize gas that the heat transmission is heated mud, generally, the boiling point of this liquid substance gets final product lower than the water temperature of hot water in the dehydration by evaporation device, and usually selecting boiling point is that 78 ℃ of ethanol or boiling point are that the acetone of 56 ℃ is just passable.
Mud after the present invention will be evaporated burns, utilize the moisture in the heat of vaporization mud that sludge incineration produces, take full advantage of the energy, technique is simple, environmental protection, the thermal source utilization is reasonable, cost is low, flue gas after burning reaches emission standard, burns the residue of generation also seldom.
100m with water ratio 80%
3Wet mud calculates, and the mud thermal capacitance is equal to water, and the vaporization heat of water is 40.8 kj/mol, is equivalent to 2260 kilojoule per kilogram, moisture percentage in sewage sludge 80%, and after evaporation process, moisture percentage in sewage sludge 20%, needs transpiring moisture 75 m
3, evaporation 75 m
3The heat that water needs is 1.7 * 10
8Kilojoule, approximately 5.8 tons of standard coals.It is 1.5 * 10 that 100 tons of water are elevated to 50 ℃ of needed heats from 15 ℃
5Kilojoule is compared this and can be ignored with vaporization heat.
100m
3Add oxygen to burn the heat 3.4 * 10 that produces after wet sludge dewatering
8Kilojoule, about 11.6 tons of standard coals, and actual boiler thermal output can reach more than 70%, in the necessary thermal losses of deduction, the heat that does not basically need extra fuel, sludge incineration to produce just can satisfy the energy that sludge water content evaporates.
Claims (5)
1. a sludge of sewage treatment plant treatment process, is characterized in that comprising the steps:
A) utilize the dehydration by evaporation device that mud is dewatered, make the water content of mud be reduced to 20-40%;
B) mud after dewatering is delivered in hot water boiler, passes into oxygen in hot water boiler, and mud is oxygen-enriched combusting in hot water boiler, and the flue gas after burning and residue are discharged;
C) hot water flow in hot water boiler is used for the dehydration of mud to the dehydration by evaporation device;
D) water that flows out from the dehydration by evaporation device is back in hot water boiler;
Described dehydration by evaporation device comprises hot water in hot-water line and ethanol or the acetone of submergence hot-water line.
2. the method for lignin-sludge according to claim 1 is characterized in that in step c) the hot water flow in hot water boiler to hot water storage pond, and the hot water flow in hot water storage pond is used for the dehydration of mud to the dehydration by evaporation device; The water that flows out from the dehydration by evaporation device in step d) is back in hot water boiler after hot water is store the pond.
3. the method for lignin-sludge according to claim 1 and 2, is characterized in that step b) in oxygen provided by the oxygen enricher of oxygen concentration for 28-30%.
4. device of realizing the described sludge of sewage treatment plant treatment process of above-mentioned arbitrary claim, it is characterized in that comprising dehydration by evaporation device, the hot water boiler that is connected with the dehydration by evaporation device, hot water boiler is connected with oxygen enricher, and dehydration by evaporation device and hot water boiler consist of water circulation system;
The hot-water line that described dehydration by evaporation device comprises device for storing liquid and runs through device for storing liquid.
5. sludge of sewage treatment plant treatment unit according to claim 4 is characterized in that also being provided with hot water storage pond, is connected with hot water boiler and connects and consist of water circulation system in dehydration by evaporation device, hot water storage pond.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012101101180A CN102643003B (en) | 2012-04-16 | 2012-04-16 | Method and device for treating sludge in sewage treatment plant |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012101101180A CN102643003B (en) | 2012-04-16 | 2012-04-16 | Method and device for treating sludge in sewage treatment plant |
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| Publication Number | Publication Date |
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| CN102643003A CN102643003A (en) | 2012-08-22 |
| CN102643003B true CN102643003B (en) | 2013-06-12 |
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| CN2012101101180A Active CN102643003B (en) | 2012-04-16 | 2012-04-16 | Method and device for treating sludge in sewage treatment plant |
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| CN105036518A (en) * | 2015-08-03 | 2015-11-11 | 复旦大学 | Deep dehydration method for excess sludge of urban sewage plant |
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| JPS56121907A (en) * | 1980-02-28 | 1981-09-25 | Ebara Corp | Combined treatment method for refuse and sewage and device thereof |
| CN101618931B (en) * | 2009-07-28 | 2011-06-29 | 清华大学 | Mud drying and incinerating integrated system and use method thereof |
| CN101774743B (en) * | 2010-01-26 | 2012-10-03 | 沈阳航空工业学院 | Latent heat recoverable multi-phase change sludge drying method and device |
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Denomination of invention: Method and device for treating sludge in sewage treatment plant Effective date of registration: 20170122 Granted publication date: 20130612 Pledgee: Jiangsu credit Company Limited by Guarantee Pledgor: JIANGSU SENSE WATER Co.,Ltd. Registration number: 2017320000001 |
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Denomination of invention: Sewage treatment plant sludge treatment method and device Effective date of registration: 20201126 Granted publication date: 20130612 Pledgee: Jiangsu Bank Co.,Ltd. Nanjing Chengxi Branch Pledgor: JIANGSU SENSE WATER Co.,Ltd. Registration number: Y2020980008510 |
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Denomination of invention: Method and device for sludge treatment in sewage treatment plants Effective date of registration: 20230323 Granted publication date: 20130612 Pledgee: Suzhou Bank Co.,Ltd. Nanjing Jiangning Branch Pledgor: JIANGSU SENSE WATER Co.,Ltd. Registration number: Y2023980035907 |
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