CN113830990A - Sludge heat energy and biological energy integrated drying and dewatering system and method - Google Patents
Sludge heat energy and biological energy integrated drying and dewatering system and method Download PDFInfo
- Publication number
- CN113830990A CN113830990A CN202111170035.6A CN202111170035A CN113830990A CN 113830990 A CN113830990 A CN 113830990A CN 202111170035 A CN202111170035 A CN 202111170035A CN 113830990 A CN113830990 A CN 113830990A
- Authority
- CN
- China
- Prior art keywords
- sludge
- drying
- biological
- heat
- energy
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Images
Classifications
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F11/00—Treatment of sludge; Devices therefor
- C02F11/12—Treatment of sludge; Devices therefor by de-watering, drying or thickening
- C02F11/13—Treatment of sludge; Devices therefor by de-watering, drying or thickening by heating
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F11/00—Treatment of sludge; Devices therefor
- C02F11/12—Treatment of sludge; Devices therefor by de-watering, drying or thickening
- C02F11/16—Treatment of sludge; Devices therefor by de-watering, drying or thickening using drying or composting beds
Landscapes
- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Mechanical Engineering (AREA)
- Drying Of Solid Materials (AREA)
- Treatment Of Sludge (AREA)
Abstract
The invention provides a sludge heat energy and biological energy integrated drying and dewatering system and method, wherein the system comprises a drying and dewatering chamber, the drying and dewatering chamber comprises a heat drying chamber at the upper part and a biological drying chamber at the lower part, the heat drying chamber and the biological drying chamber respectively comprise a conveying system, the feed end of the conveying system in the heat drying chamber receives sludge strips extruded by a sludge slitter, and sludge at the discharge end falls to the feed end of the conveying system in the biological drying chamber. The invention can achieve the aim of quickly drying the sludge with the water content of 80 percent to be below 30 percent under the condition of lower cost and no addition of foreign matters, and can effectively solve the problems in the field of sludge treatment at present.
Description
Technical Field
The invention relates to the technical field of sludge treatment, in particular to a system and a method for drying and dehydrating sludge by integrating sludge heat energy and biological energy.
Background
The harmless and resource treatment of the sludge is one of the important difficulties in the treatment of urban domestic sewage. The conventional traditional sludge treatment technology mainly comprises various technical routes such as sanitary landfill, drying incineration, anaerobic digestion, aerobic fermentation, pyrolysis gasification and the like.
The sludge heat drying technology is to dry sludge by utilizing heat energy and rapidly dry the sludge so as to achieve the purpose of reduction. The volume of the sludge after heat drying is obviously reduced, the volume can be reduced by 75-80%, the water content of the sludge can be directly heated and dried from 80% to below 10%, and the rear end of the sludge can be used for incineration or landfill.
The sludge low-temperature drying treatment technology is a sludge drying decrement technology taking a low-temperature heat pump dehumidification principle as a core, adopts a dehumidification heat pump to heat and dehumidify air, and belongs to convective hot air drying. The low-temperature sludge drying technology is a sludge treatment technology which is rapidly developed and widely applied at present, and has become a mainstream sludge drying technology due to the advantages of high efficiency, safety, stability, flexibility and the like. But has the disadvantages of large consumption of electric energy, high drying cost, and the cost of drying the sludge with the water content of 80 percent to 30 percent is about 230-260 yuan/ton
The sludge biological drying technology is a process for drying and dehydrating sludge by utilizing the principle of biological compost, namely under the condition of forced ventilation, compost microorganisms utilize organic matters in the sludge to ferment and generate heat, and ventilation is carried out at high temperature to accelerate moisture volatilization, so that the moisture of the sludge is obviously reduced, and the biological drying effect is realized. The biological drying technology is a traditional sludge treatment technology and has the advantages of rich practical experience, low investment and operation cost and the like. However, the technology needs to add a large amount of auxiliary materials (straws, sawdust, rice hulls and the like), and causes the hindering factors of large floor area, unstable auxiliary material sources and the like.
Disclosure of Invention
The invention aims to provide a sludge heat energy and biological energy integrated drying and dehydrating system and method, which can make up for the defects and shortcomings of single technology application, can fully utilize heat energy and biological energy, and can achieve the purpose of rapidly drying sludge with 80% of water content to below 30% at lower cost without adding foreign matters.
In order to achieve the purpose, the invention provides the following technical scheme:
the utility model provides a sludge heat energy and integrated mummification dewatering system of biological energy, includes mummification dewatering chamber, including the heat-drying chamber on upper portion and the biological mummification room of lower part in the mummification dewatering chamber, the heat-drying chamber with all include conveying system in the biological mummification chamber, conveying system's in the heat-drying chamber feed end receives the mud strip after the extrusion of mud slitter, and the mud of discharge end drops extremely conveying system's in the biological mummification chamber feed end.
Furthermore, a conveying system in the heat drying chamber comprises at least 3 conveying belts which are sequentially arranged and connected in a step-shaped sequence from top to bottom.
Further, the conveyor belt is a stainless steel conveyor belt with meshes on the surface.
Further, the running speed of the conveyor belt is 0.3-0.5 m/h.
Further, the heat drying device further comprises a dehumidification heat pump unit, wherein a first output part of the dehumidification heat pump unit is communicated with the heat drying chamber, and dry hot air with the temperature of 60-80 ℃ is introduced into the heat drying chamber through the dehumidification heat pump unit.
Further, a second output part of the dehumidification heat pump unit is communicated with the biological drying chamber and used for introducing dry hot air to the bottom of a conveying system of the biological drying chamber to maintain the temperature of sludge in the biological drying chamber at 50-60 ℃.
Further, the retention time of the sludge in the biological drying chamber is 3-5 days.
Further, the top of the drying and dewatering chamber is provided with an exhaust port, the exhaust port is connected with the input part of the dehumidification heat pump unit and used for introducing the hot humid air discharged from the drying and dewatering chamber into the dehumidification heat pump unit for heat exchange and converting the hot humid air into condensed water for discharge.
Furthermore, the dehumidifying heat pump unit is provided with an air blower for keeping the process gas circulating in the system to carry out a drying process and maintaining the negative pressure of the system.
The invention also provides an integrated drying and dehydrating method based on the sludge heat energy and biological energy integrated drying and dehydrating system, which comprises the following steps: the method comprises the steps of firstly, enabling raw sludge with the water content of 80% after primary dehydration in a sewage treatment plant to pass through a sludge slitter, enabling extruded sludge to enter a heat drying unit of a heat drying chamber, reducing the water content of the sludge to 50% -60% by utilizing heat energy, enabling the sludge to enter a biological drying unit of the biological drying chamber, enabling the water content of the sludge to be below 30% through microbial fermentation, and then discharging the sludge.
The sludge heat energy and biological energy integrated drying and dehydrating system and method have the beneficial effects that:
(1) the biological energy in the sludge is exerted, the heat energy consumption is reduced, and the higher investment and operating cost of the total heat energy drying are reduced.
(2) By adopting the method, the effect of quick biological drying can be achieved under the condition of not adding an additional conditioner, and meanwhile, the method can be adjusted according to different operating environments.
(3) After the sludge is dehydrated, the reduction can reach about 71.5 percent, and the subsequent treatment amount is greatly reduced.
(4) After the sludge is dried and dehydrated by integrating heat energy and biological energy, the temperature of the sludge can reach 55 ℃ for more than 3 days, and the standards of harmlessness and stabilization are achieved. The secondary pollution caused by the secondary fermentation of the sludge which is dried by heat energy is prevented.
The sludge heat energy and biological energy integrated drying and dehydrating method provided by the invention can ensure high treatment efficiency and stable treatment effect so as to achieve the purposes of harmlessness, reduction and stabilization. The purpose of quickly drying the sludge with the water content of 80 percent to be less than 30 percent is achieved under the condition of lower cost and no addition of foreign matters, and the problem in the field of sludge treatment at present can be effectively solved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic diagram of the integrated drying and dewatering system of the present invention;
FIG. 2 is a graph showing the relationship between the sludge drying energy consumption and the water content in the present invention.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it is to be understood that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The water content in the sludge is roughly classified into 4 types: interstitial water (interstitial water or free water) between particles, accounting for about 70% of the total moisture; capillary water, i.e. water in capillaries between particles, accounts for about 20%; the sludge particles adsorb water and water in the sludge particles, and the water accounts for about 10 percent. Free water among particles can be quickly removed through heat energy drying, so that the water content of the sludge is reduced from 80% to 60% (the first section), and the consumed energy is small; the water in the capillary, the adsorption water and the internal water of the sludge particles can be quickly removed after the wall of the sludge cells is broken (third stage), and the consumed energy is small; the water content of the sludge in the third section is from 40% to below 30%. And the sludge is in a plasticity and cutting stage (second stage) from 60% to 40% of water content, and the fluid property of the sludge is similar to that of glue, is gelatinous and viscous and is difficult to dispose. The second section has a great increase in heat energy consumption for drying and great difficulty in drying. The relation curve of the sludge drying energy consumption and the water content is shown in figure 2.
According to the characteristics, the dried sludge avoids the sludge plasticity stage. The drying property of the sludge is fully utilized, and the sludge is dried at the water content of more than 60 percent and less than 40 percent as much as possible. The drying energy consumption is about 2.8 times of that of drying energy consumption when the water content is between 40 and 60 percent and that of drying energy consumption when the water content is between 60 and 40 percent. Therefore, the municipal sludge is dried by adopting a heat energy and biological energy two-stage drying technology, the water content of the dewatered sludge is only reduced from 80% to 60% in the heat energy drying stage, and the biological energy drying is adopted in the second stage of 60% to 40%, so that the energy consumption is greatly saved.
The integrated drying and dewatering method and system of the present invention will be described in detail with reference to fig. 1.
According to the figure 1, the primary sludge with the water content of 80 percent after primary dehydration in a sewage treatment plant enters a drying dehydration chamber, and is continuously conveyed to a sludge strip cutting machine 1 through a pump to extrude the sludge into short strip-shaped sludge strips 8. The extruded noodle-shaped sludge strips 8 uniformly fall on the stainless steel conveying belt with the 1 st mesh in the heat drying chamber 6, and the surface area of the sludge formed by slitting is increased, so that the evaporation of water and the efficient heat transfer effect are facilitated.
The heat drying chamber 6 is provided with 3 conveyor belts which fall in a step-shaped sequence, and the conveyor belts run at a low speed of 0.3-0.5m/h to convey the sludge, so that the sludge can be fully contacted with the dry hot air of the output pipe 5 of the dehumidification heat pump unit 3. The temperature of the hot drying air is generally 60-80 ℃.
The water content of the sludge passing through the heat drying chamber 6 is gradually reduced from 80 percent to 60 percent, and 500kg/t of water is removed. The removed water is discharged out of the drying and dehydrating chamber in the form of damp and hot air with the temperature of 40-60 ℃, is conveyed to the dehumidifying heat pump unit 3 through the pipeline 2 for heat exchange, and is discharged out of the condensate water through the discharge pipe 4. Heat exchangers typically use cooling water or final discharge water condensed from the drying gas and preheat the drying gas prior to the gas furnace or other heat source to maximize thermal energy efficiency. The cold liquid generated by the heat pump can be used as a cold source to cool the gas, and the hot liquid of the heat pump is used for heating the gas in the dehydrated sludge.
A blower in the dehumidification heat pump unit 3 keeps process gas circulating in the system to carry out a drying process, and maintains the negative pressure of the system to prevent the damp and hot gas with peculiar smell from dissipating.
Through frequency conversion control, the water content of the original sludge dried by the heat drying machine set is reduced to 50-60% and then the sludge falls to the biological drying chamber 7. The biological drying sludge 9 in the biological drying chamber 7 further evaporates water by utilizing biological heat generated by the growth and reproduction of microorganisms of the sludge.
The biological drying sludge 9 in the biological drying chamber 7 is subjected to a continuous biological drying process, the sludge is slowly moved through a conveying system in the unit, a small amount of drying hot air generated by a dehumidifying heat pump unit is introduced into the bottom of the sludge, the temperature of the material is maintained at 50-60 ℃ under the combined action of the drying hot air and the biological heat, and the retention time ST of the sludge in the unit is generally 3-5 d.
After the sludge is subjected to integrated dehydration by the heat drying chamber 6 and the biological drying chamber 7, the water content of the sludge is finally gradually reduced to below 30 percent and then discharged. The final product can be subjected to resource utilization such as incineration, blending combustion, landscaping or landfill covering soil and the like.
The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and all the changes or substitutions should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (10)
1. The utility model provides a sludge heat energy and integrated mummification dewatering system of biological energy, its characterized in that, includes mummification dewatering chamber, including the heat drying room on upper portion and the biological mummification room of lower part in the mummification dewatering chamber, the heat drying room with all include conveying system in the biological mummification room, conveying system's in the heat drying room feed end receives the mud strip after the extrusion of mud slitter, and the mud of discharge end drops to conveying system's in the biological mummification room feed end.
2. The sludge heat energy and biological energy integrated drying and dewatering system according to claim 1, characterized in that: the conveying system in the heat drying chamber comprises at least 3 conveying belts which are sequentially arranged and connected in a step-shaped sequence from top to bottom.
3. The sludge heat energy and biological energy integrated drying and dewatering system according to claim 2, characterized in that: the conveyer belt is a stainless steel conveyer belt with meshes on the surface.
4. The sludge heat energy and biological energy integrated drying and dewatering system according to claim 3, characterized in that: the running speed of the conveyor belt is 0.3-0.5 m/h.
5. The sludge heat energy and biological energy integrated drying and dewatering system according to any one of claims 1 to 4, characterized in that: the heat drying device is characterized by further comprising a dehumidification heat pump unit, wherein a first output part of the dehumidification heat pump unit is communicated with the heat drying chamber, and dry hot air with the temperature of 60-80 ℃ is introduced into the heat drying chamber through the dehumidification heat pump unit.
6. The sludge heat energy and biological energy integrated drying and dewatering system according to claim 5, characterized in that: and a second output part of the dehumidification heat pump unit is communicated with the biological drying chamber and is used for introducing dry hot air to the bottom of a conveying system of the biological drying chamber so as to maintain the temperature of sludge in the biological drying chamber at 50-60 ℃.
7. The sludge heat energy and biological energy integrated drying and dewatering system according to claim 6, characterized in that: the retention time of the sludge in the biological drying chamber is 3-5 days.
8. The sludge heat energy and biological energy integrated drying and dewatering system according to claim 7, characterized in that: the top of the drying and dewatering chamber is provided with an exhaust port, the exhaust port is connected with the input part of the dehumidification heat pump unit and is used for introducing the hot and humid air discharged from the drying and dewatering chamber into the dehumidification heat pump unit for heat exchange and converting the hot and humid air into condensed water to be discharged.
9. The sludge heat energy and biological energy integrated drying and dewatering system according to claim 8, characterized in that: and the dehumidification heat pump unit is internally provided with an air blower for keeping the process gas circulating in the system to carry out a drying process and maintaining the negative pressure of the system.
10. An integrated drying and dewatering method based on the sludge heat energy and biological energy integrated drying and dewatering system of any one of claims 1 to 9, characterized in that: the method comprises the following steps: the method comprises the steps of firstly, enabling raw sludge with the water content of 80% after primary dehydration in a sewage treatment plant to pass through a sludge slitter, enabling extruded sludge to enter a heat drying unit of a heat drying chamber, reducing the water content of the sludge to 50% -60% by utilizing heat energy, enabling the sludge to enter a biological drying unit of the biological drying chamber, enabling the water content of the sludge to be below 30% through microbial fermentation, and then discharging the sludge.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111170035.6A CN113830990A (en) | 2021-10-08 | 2021-10-08 | Sludge heat energy and biological energy integrated drying and dewatering system and method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111170035.6A CN113830990A (en) | 2021-10-08 | 2021-10-08 | Sludge heat energy and biological energy integrated drying and dewatering system and method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN113830990A true CN113830990A (en) | 2021-12-24 |
Family
ID=78968318
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111170035.6A Pending CN113830990A (en) | 2021-10-08 | 2021-10-08 | Sludge heat energy and biological energy integrated drying and dewatering system and method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN113830990A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115010340A (en) * | 2022-05-17 | 2022-09-06 | 诚邦生态环境股份有限公司 | Sludge dewatering, drying and composting integrated device and sludge treatment method |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1727292A (en) * | 2004-07-29 | 2006-02-01 | 机科发展科技股份有限公司 | Method for integrating technique of damp drying sludge with technique for fermenting acrobic compost in high temperature |
| CN101746941A (en) * | 2008-12-10 | 2010-06-23 | 清华大学 | Biological drying method for treating dewatered sludge of urban sewage plant |
| JP2013188723A (en) * | 2012-03-15 | 2013-09-26 | Toshiba Corp | Sludge drying system and sludge drying and carbonizing system |
| CN103864275A (en) * | 2014-04-03 | 2014-06-18 | 竺勇 | Bio-drying and dehumidifying coupled heat-pump flap tower type sludge drying process and system thereof |
| CN103964661A (en) * | 2013-02-06 | 2014-08-06 | 同济大学 | System and method for gradient dewatering drying of sludge |
| CN106336105A (en) * | 2016-10-09 | 2017-01-18 | 上海市政工程设计研究总院（集团）有限公司 | Method for vertical solar intensified deep biological drying of sludge |
| CN106477840A (en) * | 2016-11-23 | 2017-03-08 | 上海市政工程设计研究总院（集团）有限公司 | A kind of heat pump assists sludge organism drying method |
| CN106746455A (en) * | 2016-12-20 | 2017-05-31 | 上海市政工程设计研究总院（集团）有限公司 | A kind of biological dewatered method of anaerobically digested sludge |
-
2021
- 2021-10-08 CN CN202111170035.6A patent/CN113830990A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1727292A (en) * | 2004-07-29 | 2006-02-01 | 机科发展科技股份有限公司 | Method for integrating technique of damp drying sludge with technique for fermenting acrobic compost in high temperature |
| CN101746941A (en) * | 2008-12-10 | 2010-06-23 | 清华大学 | Biological drying method for treating dewatered sludge of urban sewage plant |
| JP2013188723A (en) * | 2012-03-15 | 2013-09-26 | Toshiba Corp | Sludge drying system and sludge drying and carbonizing system |
| CN103964661A (en) * | 2013-02-06 | 2014-08-06 | 同济大学 | System and method for gradient dewatering drying of sludge |
| CN103864275A (en) * | 2014-04-03 | 2014-06-18 | 竺勇 | Bio-drying and dehumidifying coupled heat-pump flap tower type sludge drying process and system thereof |
| CN106336105A (en) * | 2016-10-09 | 2017-01-18 | 上海市政工程设计研究总院（集团）有限公司 | Method for vertical solar intensified deep biological drying of sludge |
| CN106477840A (en) * | 2016-11-23 | 2017-03-08 | 上海市政工程设计研究总院（集团）有限公司 | A kind of heat pump assists sludge organism drying method |
| CN106746455A (en) * | 2016-12-20 | 2017-05-31 | 上海市政工程设计研究总院（集团）有限公司 | A kind of biological dewatered method of anaerobically digested sludge |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115010340A (en) * | 2022-05-17 | 2022-09-06 | 诚邦生态环境股份有限公司 | Sludge dewatering, drying and composting integrated device and sludge treatment method |
| CN115010340B (en) * | 2022-05-17 | 2024-04-02 | 诚邦生态环境股份有限公司 | Sludge dewatering and drying composting integrated device and sludge treatment method |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN100450947C (en) | Sludge drying and resource disposal process | |
| CN103864275A (en) | Bio-drying and dehumidifying coupled heat-pump flap tower type sludge drying process and system thereof | |
| CN103964661A (en) | System and method for gradient dewatering drying of sludge | |
| CN112645747B (en) | Organic fertilizer drying and fermenting process | |
| CN111153579A (en) | Sludge heatless drying method and device system thereof | |
| CN116854327A (en) | Treatment method for drying and stabilizing organic sludge | |
| CN108947593A (en) | Quickly environmental protection aerobic fermentation Tower System | |
| CN113830990A (en) | Sludge heat energy and biological energy integrated drying and dewatering system and method | |
| CN103524008A (en) | Automatic processing handling process for zero discharge of sludge for urban sewage plant | |
| CN206255975U (en) | Sewage sludge continuous band and the complete processing system of heat pump desiccation | |
| WO2021253659A1 (en) | Solar sludge drying and sludge composting combined treatment method and device | |
| CN203216225U (en) | Low-temperature drying energy-saving system | |
| CN106007285A (en) | Municipal sludge treatment method and heat pump and solar energy coupling system for implementing method | |
| CN102992570A (en) | Electric-regenerative solar energy assisted sludge biodrying system | |
| CN116002945A (en) | Sludge heatless drying method | |
| CN207451916U (en) | A kind of new energy recycling sludge system | |
| CN114634286B (en) | System and method for preparing fecal biochar and flushing toilet by utilizing solar energy and pyrolysis waste heat | |
| CN102897984B (en) | The two-stage sludge drying method of energy-conserving and environment-protective | |
| CN115784545A (en) | Method and device for drying and sterilizing livestock excrement by utilizing fermentation thermal coupling intermittent negative pressure | |
| CN214348577U (en) | Kitchen waste aerobic treatment equipment | |
| JPH0366955B2 (en) | ||
| CN113149734A (en) | High-reduction low-cost municipal sludge composting treatment method and system | |
| CN108202076A (en) | A kind of pump coupled heat biological heat anhydration system and method | |
| CN203451347U (en) | Sludge heat-drying system | |
| CN204298210U (en) | A kind of for municipal sludge advanced treatment system |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |