CN116002944A - Sludge dewatering method - Google Patents
Sludge dewatering method Download PDFInfo
- Publication number
- CN116002944A CN116002944A CN202211325358.2A CN202211325358A CN116002944A CN 116002944 A CN116002944 A CN 116002944A CN 202211325358 A CN202211325358 A CN 202211325358A CN 116002944 A CN116002944 A CN 116002944A
- Authority
- CN
- China
- Prior art keywords
- sludge
- conditioner
- dehydration
- dewatering
- mixing
- 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
- 239000010802 sludge Substances 0.000 title claims abstract description 78
- 238000000034 method Methods 0.000 title claims abstract description 36
- 230000018044 dehydration Effects 0.000 claims abstract description 31
- 238000006297 dehydration reaction Methods 0.000 claims abstract description 31
- 239000000463 material Substances 0.000 claims abstract description 30
- 238000001035 drying Methods 0.000 claims abstract description 24
- 238000002156 mixing Methods 0.000 claims abstract description 21
- 238000003825 pressing Methods 0.000 claims abstract description 18
- 238000003756 stirring Methods 0.000 claims abstract description 9
- 238000012216 screening Methods 0.000 claims abstract description 7
- 238000000926 separation method Methods 0.000 claims abstract description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 30
- 239000002245 particle Substances 0.000 claims description 21
- 239000012792 core layer Substances 0.000 claims description 13
- 239000002344 surface layer Substances 0.000 claims description 10
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 6
- 239000000203 mixture Substances 0.000 claims description 6
- 238000007873 sieving Methods 0.000 claims description 5
- 229910018072 Al 2 O 3 Inorganic materials 0.000 claims description 4
- 238000005188 flotation Methods 0.000 claims description 4
- 238000007885 magnetic separation Methods 0.000 claims description 4
- 229910004298 SiO 2 Inorganic materials 0.000 claims description 3
- 229910017052 cobalt Inorganic materials 0.000 claims description 3
- 239000010941 cobalt Substances 0.000 claims description 3
- GUTLYIVDDKVIGB-UHFFFAOYSA-N cobalt atom Chemical compound [Co] GUTLYIVDDKVIGB-UHFFFAOYSA-N 0.000 claims description 3
- 229910052742 iron Inorganic materials 0.000 claims description 3
- 239000007769 metal material Substances 0.000 claims description 3
- 238000005245 sintering Methods 0.000 claims description 3
- 239000003795 chemical substances by application Substances 0.000 abstract description 8
- 230000003750 conditioning effect Effects 0.000 abstract description 8
- 230000008569 process Effects 0.000 abstract description 7
- 238000001914 filtration Methods 0.000 abstract description 5
- 238000004064 recycling Methods 0.000 description 5
- 238000005265 energy consumption Methods 0.000 description 4
- 230000005389 magnetism Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 239000008394 flocculating agent Substances 0.000 description 2
- 229920002401 polyacrylamide Polymers 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 239000012752 auxiliary agent Substances 0.000 description 1
- 125000002091 cationic group Chemical group 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 239000011162 core material Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000004090 dissolution Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 239000003337 fertilizer Substances 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000004898 kneading Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000010297 mechanical methods and process Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 239000010865 sewage Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Images
Landscapes
- Treatment Of Sludge (AREA)
Abstract
The sludge dewatering process includes the steps of mixing, press filtering to dewater, stoving, crushing and sorting; mixing: mixing and uniformly stirring the sludge and the conditioner; and (3) filter pressing and dehydration: carrying out filter pressing dehydration on the sludge mixed with the conditioner by adopting a dehydrator to obtain a mud cake; and (3) drying: drying the dehydrated sludge to obtain a mud cake; crushing: crushing the mud cake to obtain a powdery material; sorting: comprises the steps of separation, screening and the like to obtain the dry sludge and the conditioner. The invention adopts the recyclable conditioning agent, and the conditioning agent is separated, recycled and reused after being used, so that the dehydration cost can be reduced, and the pollution to the environment can be reduced, and the invention belongs to the technical field of sludge dehydration.
Description
Technical Field
The invention relates to the field of sludge dewatering, in particular to a sludge dewatering method.
Background
In recent years, with the improvement of life of people, the discharge amount of sludge is also increased year by year, and simultaneously, the sludge treatment requirement is also increased. In order to meet the requirements of transportation, landfill or resource utilization of the sludge, in the prior art, the sludge is usually subjected to pretreatment and deep dehydration, and then is subjected to drying treatment, so that the water content of the sludge is dehydrated to the available water content.
The common mechanical method can only remove surface adsorbed water and capillary water, is difficult to remove bound water and interstitial water, the water content of the sludge after common mechanical dehydration is still about 80%, a large amount of chemical conditioning agents are required to be added in the mechanical dehydration process, and the deep dehydration requirement can be barely met under a high pressure state, such as cationic Polyacrylamide (PAM) is one of the most widely applied sludge conditioning agents of the current sewage treatment plants, but the cost is high, the dissolution is difficult, and the dehydration effect is not excellent. In addition, when other flocculants are used independently, the dosage is large, the fertilizer efficiency and the heat value of the flocculants are reduced due to the increase of the proportion of inorganic components, secondary pollution is easy to generate, and the application field is narrow due to the severe environmental requirements of pH value, ionic strength and the like. The use of a large amount of chemical conditioning agents can cause serious environmental pollution, and the problems of complex process, high cost, difficult realization of recycling and the like are faced.
The sludge drying is to utilize heat energy to change the water in the sludge into water vapor to be dissipated after mechanical dehydration, so as to obtain the dried sludge with 15-40% of water content. However, the sludge drying treatment mode also has the defects of high energy consumption, high investment and maintenance cost, secondary pollution to the environment and the like.
Therefore, a proper sludge dewatering process with simple process, low cost and low energy consumption is selected, the water requirement of sludge recycling is met, and the method has important significance for promoting the continuous progress of sludge treatment industry and truly realizing the recycling of sludge.
Disclosure of Invention
Aiming at the technical problems existing in the prior art, the invention aims at: the sludge dewatering method adopts the physical conditioner to carry out deep dewatering so as to meet the requirement of recycling water, reduce the pollution to the environment and effectively reduce the energy consumption loss during drying.
In order to achieve the above purpose, the invention adopts the following technical scheme: the sludge dewatering process includes the steps of mixing, press filtering to dewater, stoving, crushing and sorting;
mixing: mixing and uniformly stirring the sludge and the conditioner;
and (3) filter pressing and dehydration: carrying out filter pressing dehydration on the sludge mixed with the conditioner by adopting a dehydrator;
and (3) drying: drying the dehydrated sludge to obtain a mud cake;
crushing: crushing the mud cake to obtain a powdery material;
sorting: and separating and screening the powdery materials to obtain the dry sludge and the conditioner.
Preferably, the conditioner obtained by separation is used for next sludge dewatering.
Preferably, the mass of the conditioning agent is 1 time or more the mass of the sludge when mixed.
As a preferable mode, a dehydrator with a dehydration pressure of more than 3MPa is used in the press filtration dehydration.
Preferably, after the filter pressing dehydration, the water content of the sludge is detected, when the water content is less than 50%, a drying step is performed, and when the water content is detected to be more than 50%, the filter pressing dehydration is continued until the water content is less than 50%, and then the drying step is performed, wherein the drying temperature is more than 100 ℃.
Preferably, the conditioning agent and the sludge are separated by one or more of magnetic separation, floatation and sieving.
As a preferable method, a ball mill or a crusher is used for the crushing.
Preferably, the conditioner is a physical conditioner which does not chemically react with the sludge, the physical conditioner consists of conditioner particles with the particle size of 30-350 microns, the conditioner particles are prepared by mixing and granulating a core layer material and a surface layer material, and the core layer material is a magnetic metal material.
Preferably, the composition of the core layer material comprises iron and/or cobalt, and the composition of the surface layer material comprises SiO 2 And Al 2 O 3 。
Preferably, the conditioning agent is obtained by mixing and stirring the surface layer material and the core layer material, sintering, crushing and screening.
In general, the invention has the following advantages: the method uses a physical conditioner, the conditioner is uniformly mixed with the sludge, the inside of the sludge is bridged by the action between the conditioner and the sludge, the internal structure of the sludge is destroyed under a higher pressure state, the water in the sludge is removed, the effect of deep dehydration can be achieved, the energy consumption loss during drying is effectively reduced, the dehydrated conditioner can be separated from the sludge for recycling, the use cost of the conditioner can be reduced, and the pollution to the environment is reduced.
Drawings
Fig. 1 is a flow chart of a sludge dewatering method.
Detailed Description
The invention will be described in further detail with reference to the drawings and the detailed description.
Example 1
The sludge dewatering process includes the steps of mixing, press filtering to dewater, stoving, crushing and sorting;
mixing: mixing and uniformly stirring the sludge and the conditioner;
and (3) filter pressing and dehydration: carrying out filter pressing dehydration on the sludge mixed with the conditioner by adopting a dehydrator;
and (3) drying: drying the dehydrated sludge to obtain a mud cake;
crushing: crushing the mud cake to obtain a powdery material;
sorting: and separating and screening the powdery materials to obtain the dry sludge and the conditioner.
The conditioner obtained by separation is used for next sludge dewatering. The sorted conditioner is mixed with the sludge to be dehydrated again, the steps are repeated, and a proper amount of new conditioner can be supplemented according to the loss of the conditioner during remixing.
When mixing, the mass of the conditioner is more than 1 time of the mass of the sludge.
And in the filter pressing dehydration, a dehydrator with dehydration pressure of more than 3Mpa is adopted.
After the filter pressing dehydration, the water content of the sludge is detected, when the water content is less than 50%, a drying step is carried out, when the water content is detected to be more than 50%, the filter pressing dehydration is continued until the water content is less than 50%, and then the drying step is carried out, wherein the drying temperature is more than 100 ℃.
During separation, one or more than two of a magnetic separation method, a flotation method and a sieving method are adopted to separate the conditioner from the sludge.
Selecting a portion having magnetism, i.e., conditioner particles having a core material, based on whether the portion has magnetism when the magnetic separation method is adopted; when the sieving method is adopted, the particle size is selected based on the particle size of the particles, and the particle size of the conditioner particles is 30-350 microns and is generally smaller than the particle size of the sludge particles, so that the part with smaller particle size can be selected by the sieving method; when the flotation method is adopted, the density of the conditioner particles is higher than that of the sludge, so that the part with higher density can be selected by the flotation method.
During crushing, a ball mill or a crusher is adopted.
The conditioner is a physical conditioner which does not chemically react with the sludge, the physical conditioner consists of conditioner particles with the particle size of 30-350 microns, the conditioner particles are prepared by mixing and granulating a core layer material and a surface layer material, and the core layer material is a magnetic metal material.
The composition of the core layer material comprises iron and/or cobalt, and the composition of the surface layer material comprises SiO 2 And Al 2 O 3 。
The core layer material is in powder form with granularity of 15-250 microns, the surface layer material comprises aggregate and auxiliary agent, siO 2 And Al 2 O 3 The aggregate is powdery and has a particle size of less than 100 microns.
The conditioner is obtained by mixing and stirring the surface layer material and the core layer material, sintering, crushing and screening.
Taking 80% water content sludge as an example, mixing and stirring the sludge and a conditioner in a ratio of 1:1, after uniformly stirring, carrying out high-pressure filter pressing by using a stepped continuous pressurizing deep dehydrator, measuring the water content to be 15% by using a water content tester, calculating that one kilogram of sludge contains 800 g of water, dehydrating, removing 589 g of water, and achieving deep dehydration. And kneading and dispersing the mixed mud after press filtration, drying at 105 ℃, conveying the dried mixed mud into a crusher for crushing, separating and collecting the conditioner according to the differences of magnetism, particle size and density, and then re-using the conditioner with the mud according to the proportion.
The above examples are preferred embodiments of the present invention, but the embodiments of the present invention are not limited to the above examples, and any other changes, modifications, substitutions, combinations, and simplifications that do not depart from the spirit and principle of the present invention should be made in the equivalent manner, and the embodiments are included in the protection scope of the present invention.
Claims (10)
1. A sludge dewatering method is characterized in that: comprises the steps of mixing, filter pressing, dehydration, drying, crushing and sorting;
mixing: mixing and uniformly stirring the sludge and the conditioner;
and (3) filter pressing and dehydration: carrying out filter pressing dehydration on the sludge mixed with the conditioner by adopting a dehydrator;
and (3) drying: drying the dehydrated sludge to obtain a mud cake;
crushing: crushing the mud cake to obtain a powdery material;
sorting: and separating and screening the powdery materials to obtain the dry sludge and the conditioner.
2. A method for dewatering sludge as claimed in claim 1, wherein: the conditioner obtained by separation is used for next sludge dewatering.
3. A method for dewatering sludge as claimed in claim 1, wherein: when mixing, the mass of the conditioner is more than 1 time of the mass of the sludge.
4. A method for dewatering sludge as claimed in claim 1, wherein: and in the filter pressing dehydration, a dehydrator with dehydration pressure of more than 3Mpa is adopted.
5. A method for dewatering sludge as claimed in claim 1, wherein: after the filter pressing dehydration, the water content of the sludge is detected, when the water content is less than 50%, a drying step is carried out, when the water content is detected to be more than 50%, the filter pressing dehydration is continued until the water content is less than 50%, and then the drying step is carried out, wherein the drying temperature is more than 100 ℃.
6. A method for dewatering sludge as claimed in claim 1, wherein: during separation, one or more than two of a magnetic separation method, a flotation method and a sieving method are adopted to separate the conditioner from the sludge.
7. A method for dewatering sludge as claimed in claim 1, wherein: during crushing, a ball mill or a crusher is adopted.
8. A method for dewatering sludge as claimed in claim 1, wherein: the conditioner is a physical conditioner which does not chemically react with the sludge, the physical conditioner consists of conditioner particles with the particle size of 30-350 microns, the conditioner particles are prepared by mixing and granulating a core layer material and a surface layer material, and the core layer material is a magnetic metal material.
9. A method for dewatering sludge as claimed in claim 8, wherein: the composition of the core layer material comprises iron and/or cobalt, and the composition of the surface layer material comprises SiO 2 And Al 2 O 3 。
10. A method for dewatering sludge as claimed in claim 8, wherein: the conditioner is obtained by mixing and stirring the surface layer material and the core layer material, sintering, crushing and screening.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211325358.2A CN116002944A (en) | 2022-10-27 | 2022-10-27 | Sludge dewatering method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211325358.2A CN116002944A (en) | 2022-10-27 | 2022-10-27 | Sludge dewatering method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN116002944A true CN116002944A (en) | 2023-04-25 |
Family
ID=86030644
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202211325358.2A Pending CN116002944A (en) | 2022-10-27 | 2022-10-27 | Sludge dewatering method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN116002944A (en) |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103073170A (en) * | 2013-01-15 | 2013-05-01 | 中国地质大学（武汉） | Deep sludge dehydrated method based on magnetic super-strong absorbent |
| CN106517730A (en) * | 2016-12-07 | 2017-03-22 | 华南理工大学 | Fine powder based sludge dewatering treatment method and equipment |
-
2022
- 2022-10-27 CN CN202211325358.2A patent/CN116002944A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103073170A (en) * | 2013-01-15 | 2013-05-01 | 中国地质大学（武汉） | Deep sludge dehydrated method based on magnetic super-strong absorbent |
| CN106517730A (en) * | 2016-12-07 | 2017-03-22 | 华南理工大学 | Fine powder based sludge dewatering treatment method and equipment |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN103752401B (en) | Potash feldspar iron removal process | |
| CN100569381C (en) | The iron-removing concentrating process of potassic feldspar | |
| CN104858204B (en) | A kind of resource utilization method of Fly ash bead | |
| CN101716487B (en) | Steel slag composite adsorbing agent and method for processing printing and dyeing wastewater | |
| CN107129129B (en) | Zeolite-modified sludge deep dehydration high-efficiency conditioner and preparation method thereof | |
| CN110624506B (en) | Method for preparing water purifying agent by utilizing coal gasification furnace slag and obtained water purifying agent | |
| CN111302589B (en) | Efficient dewatering method for urban construction waste mud | |
| CN106943991A (en) | A kind of dephosphorization modified steel scoria haydite and preparation method and application | |
| CN108793731B (en) | Preparation method of raw material for ultra-white glass | |
| CN111116167A (en) | Composition for preparing cold bonding artificial aggregate and prepared cold bonding artificial aggregate | |
| CN113651549A (en) | Recycled concrete aggregate reinforced by construction waste micro powder and preparation method thereof | |
| CN112264183A (en) | Resource treatment method of high-sulfur copper tailings, product and application thereof | |
| CN113244879B (en) | Application of iron phosphate microspheres in treatment of wastewater containing methylene blue | |
| CN103316764B (en) | A kind of method that reclaims titanium dioxide from titanium dioxide acid hydrolysis body refuse | |
| CN115010508A (en) | Method for preparing ceramsite green body from iron tailings and coal gangue | |
| CN107245581A (en) | A kind of reuse method for drenching lead plumbate mud | |
| CN117534361A (en) | Metallurgical solid waste concrete admixture and preparation method and application thereof | |
| CN116002944A (en) | Sludge dewatering method | |
| CN115304239B (en) | Preparation method of physical conditioner for sludge dewatering and physical conditioner | |
| CN101254375A (en) | Dewatering process screening fine ore of alumyte | |
| CN108588409B (en) | A kind of floating tail-coal base metallurgical briquetting binder and preparation method thereof | |
| CN109317289A (en) | Dry sand medium preparation process is used on air dry sand Recognition Applied in Coal Preparation System | |
| CN111689788B (en) | Alkali mud-based ceramsite and preparation method thereof | |
| CN209989272U (en) | System for preparing magnesium oxide from low-grade magnesite | |
| CN108306070A (en) | A kind of method that lead-acid accumulator leaching lead plumbate mud processing recycles |
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 |