CN112094025A - System and method for recovering phosphorus in sludge - Google Patents
System and method for recovering phosphorus in sludge Download PDFInfo
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- CN112094025A CN112094025A CN202010933834.3A CN202010933834A CN112094025A CN 112094025 A CN112094025 A CN 112094025A CN 202010933834 A CN202010933834 A CN 202010933834A CN 112094025 A CN112094025 A CN 112094025A
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- sludge
- carbonization
- carbide
- phosphorus
- acid
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- 239000010802 sludge Substances 0.000 title claims abstract description 179
- 229910052698 phosphorus Inorganic materials 0.000 title claims abstract description 44
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 title claims abstract description 43
- 239000011574 phosphorus Substances 0.000 title claims abstract description 43
- 238000000034 method Methods 0.000 title claims abstract description 26
- 238000003763 carbonization Methods 0.000 claims abstract description 39
- 239000002253 acid Substances 0.000 claims abstract description 36
- 238000001035 drying Methods 0.000 claims abstract description 28
- 238000006243 chemical reaction Methods 0.000 claims abstract description 15
- 229910019142 PO4 Inorganic materials 0.000 claims abstract description 14
- 239000010452 phosphate Substances 0.000 claims abstract description 14
- NBIIXXVUZAFLBC-UHFFFAOYSA-K phosphate Chemical compound [O-]P([O-])([O-])=O NBIIXXVUZAFLBC-UHFFFAOYSA-K 0.000 claims abstract description 14
- 238000006386 neutralization reaction Methods 0.000 claims abstract description 12
- 239000007787 solid Substances 0.000 claims abstract description 12
- 238000001914 filtration Methods 0.000 claims abstract description 11
- 239000007788 liquid Substances 0.000 claims abstract description 7
- 239000000126 substance Substances 0.000 claims abstract description 5
- 239000007789 gas Substances 0.000 claims description 23
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 17
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims description 16
- 239000003546 flue gas Substances 0.000 claims description 16
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 claims description 8
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 claims description 8
- CWYNVVGOOAEACU-UHFFFAOYSA-N Fe2+ Chemical compound [Fe+2] CWYNVVGOOAEACU-UHFFFAOYSA-N 0.000 claims description 7
- 238000002485 combustion reaction Methods 0.000 claims description 6
- 230000018044 dehydration Effects 0.000 claims description 6
- 238000006297 dehydration reaction Methods 0.000 claims description 6
- VTLYFUHAOXGGBS-UHFFFAOYSA-N Fe3+ Chemical compound [Fe+3] VTLYFUHAOXGGBS-UHFFFAOYSA-N 0.000 claims description 5
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 claims description 5
- 239000004215 Carbon black (E152) Substances 0.000 claims description 3
- 229930195733 hydrocarbon Natural products 0.000 claims description 3
- 150000002430 hydrocarbons Chemical class 0.000 claims description 3
- 150000002505 iron Chemical class 0.000 claims description 3
- 238000011084 recovery Methods 0.000 claims description 3
- 229910000859 α-Fe Inorganic materials 0.000 claims description 2
- BAUYGSIQEAFULO-UHFFFAOYSA-L iron(2+) sulfate (anhydrous) Chemical compound [Fe+2].[O-]S([O-])(=O)=O BAUYGSIQEAFULO-UHFFFAOYSA-L 0.000 abstract description 9
- 238000002386 leaching Methods 0.000 abstract description 4
- 230000009286 beneficial effect Effects 0.000 abstract 1
- 238000004090 dissolution Methods 0.000 abstract 1
- 239000000243 solution Substances 0.000 description 19
- 238000010438 heat treatment Methods 0.000 description 16
- 238000002347 injection Methods 0.000 description 10
- 239000007924 injection Substances 0.000 description 10
- 239000006185 dispersion Substances 0.000 description 8
- 230000000694 effects Effects 0.000 description 6
- 239000007921 spray Substances 0.000 description 6
- 238000004140 cleaning Methods 0.000 description 4
- 230000008569 process Effects 0.000 description 4
- 239000010865 sewage Substances 0.000 description 4
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 3
- 229910052799 carbon Inorganic materials 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 238000004321 preservation Methods 0.000 description 3
- 239000003638 chemical reducing agent Substances 0.000 description 2
- 238000005265 energy consumption Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000000605 extraction Methods 0.000 description 2
- 230000014759 maintenance of location Effects 0.000 description 2
- 238000004064 recycling Methods 0.000 description 2
- 239000002893 slag Substances 0.000 description 2
- 230000001133 acceleration Effects 0.000 description 1
- 238000010000 carbonizing Methods 0.000 description 1
- 238000012851 eutrophication Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- 229910000398 iron phosphate Inorganic materials 0.000 description 1
- WBJZTOZJJYAKHQ-UHFFFAOYSA-K iron(3+) phosphate Chemical compound [Fe+3].[O-]P([O-])([O-])=O WBJZTOZJJYAKHQ-UHFFFAOYSA-K 0.000 description 1
- 150000001247 metal acetylides Chemical class 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000003472 neutralizing effect Effects 0.000 description 1
- 235000015097 nutrients Nutrition 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
Images
Classifications
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- 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
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B25/00—Phosphorus; Compounds thereof
- C01B25/16—Oxyacids of phosphorus; Salts thereof
- C01B25/26—Phosphates
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01G—COMPOUNDS CONTAINING METALS NOT COVERED BY SUBCLASSES C01D OR C01F
- C01G49/00—Compounds of iron
-
- 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
- C02F11/10—Treatment of sludge; Devices therefor by pyrolysis
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/105—Phosphorus compounds
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2303/00—Specific treatment goals
- C02F2303/10—Energy recovery
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Engineering & Computer Science (AREA)
- Inorganic Chemistry (AREA)
- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Mechanical Engineering (AREA)
- Treatment Of Sludge (AREA)
Abstract
The invention discloses a method for recovering phosphorus in sludge, which comprises the following steps: s1, dewatering the sludge in a dewatering device; s2, drying the dewatered sludge in a sludge drying device; s3, the dried sludge enters a carbonization furnace for anoxic carbonization treatment, and sludge carbide is generated after the sludge is carbonized; s4, transferring the sludge carbide into an acid reaction tank and adding an acid solution; s5, after full reaction, pouring the substances in the acid reaction tank into a filtering device for filtering, wherein the filtered liquid is the obtained phosphorus resource product, and the filtered solid is recycled after neutralization; the method has the beneficial effects that the specific surface area of the carbonized sludge is increased, the sludge carbide generated after the sludge carbonization contains phosphate, ferrous salt and the like, the phosphate, the ferrous salt and the like are fully dissolved in acid liquor through acid leaching, the phosphorus dissolution rate is high by adopting the method, and the obtained phosphorus resource product is better.
Description
Technical Field
The invention relates to the field of sludge treatment, in particular to a system and a method for recovering phosphorus in sludge.
Background
Phosphorus is an important non-metallic mineral resource which is difficult to regenerate, and is also an indispensable element for the activity of life bodies. Phosphorus resources in the world are in shortage, so that new phosphorus ore resources have to be searched. The sludge contains rich organic matters, N, P and other nutrient elements, the recycling of phosphorus resources in the sludge brings a new direction for the resource utilization of the sludge in sewage treatment plants, and the eutrophication degree of water bodies can be reduced, thereby having important significance for the recycling of resources.
Along with the improvement of living standard of people and the acceleration of urbanization process, the water consumption per capita is rapidly increased, the treatment capacity of domestic sewage is continuously increased, sludge is used as a necessary product for sewage treatment, the yield is continuously increased, the yield of sludge in China is about 5500 ten thousand tons every year according to data, the content of phosphorus in sludge accounts for 3% -5% of the content of dry-based substances of sludge, and therefore, the phosphorus content in sludge is extremely rich.
At present, the conventional sludge treatment mode adopted by a sludge plant is incineration, and the extraction of phosphate from the incinerated slag by acid leaching is an effective method for recovering phosphorus, but the extraction rate of phosphorus is relatively low because the incinerated slag is coked and iron phosphate is not easy to dissolve out, so how to improve the recovery rate of phosphorus in sludge is an urgent problem to be solved.
Disclosure of Invention
The invention aims to solve the problems and designs a system and a method for recovering phosphorus in sludge.
The technical scheme of the invention is that the system for recovering phosphorus in sludge comprises a plate-and-frame filter press, wherein an outlet of the plate-and-frame filter press is connected with an inlet of a sludge drying device, an outlet of the sludge drying device is connected with an inlet of a carbonization furnace, a sludge outlet of the carbonization furnace is connected with an inlet of an acid reaction tank, an outlet of the acid reaction tank is connected with an inlet of a filtering device, and an outlet of the filtering device is connected with an inlet of a neutralizing device.
The gas outlet intercommunication of carbide furnace has flue gas treatment facility, flue gas treatment facility's export and combustor intercommunication, the heat that the combustor produced supplies with the carbide furnace.
The technical scheme of the invention is that the method for recovering phosphorus from sludge comprises the following steps:
s1, dewatering the sludge in a dewatering device;
s2, drying the dewatered sludge in a sludge drying device;
s3, the dried sludge enters a carbonization furnace for anoxic or anoxybiotic carbonization treatment, and sludge carbide and combustible gas are generated after the sludge is carbonized;
s4, transferring the sludge carbide into an acid reaction tank and adding an acid solution;
and S5, after full reaction, pouring the substances in the acid reaction tank into a filtering device for filtering, wherein the filtered liquid is the obtained phosphorus resource product, and the filtered solid is recycled after neutralization.
Further, in the step S1, the dewatering device is a plate-and-frame filter press, the dewatering pressure of the plate-and-frame filter press is 0.4 to 1.0MPa, the sludge stays in the plate-and-frame filter press for 90 to 120min, and the water content of the dewatered sludge is 60 to 75%.
Further, in the step S2, the water content of the dried sludge is 10% to 40%.
Further, in the step S3, the carbonization temperature of the sludge is 300 to 1000 ℃, the carbonization time is 30 to 60min, the sludge contains phosphate, iron salt and the like, ferric iron in the carbonized sludge is reduced to ferrous iron, combustible gas generated by the carbonized sludge is mainly hydrocarbon, the combustible gas enters the flue gas treatment device 30 along with flue gas generated by carbonization, and the combustible gas after passing through the flue gas treatment device 30 enters the combustor 31 for combustion.
Further, in the step S4, the acid solution is one of sulfuric acid or hydrochloric acid, the volume of the acid solution and the solid-to-liquid ratio of the sludge carbide are greater than 150ml/g, the pH value is controlled to be 1 to 3, and after the sludge carbide is soaked in the acid solution, phosphate, ferrite, and the like are dissolved in the acid solution.
Further, in step S5, the filtered solid enters the neutralization device 26 to undergo a neutralization reaction, and the neutralized solid is recycled.
The sludge drying device comprises a shell, a sludge inlet and a steam outlet are formed in the upper portion of the shell, a sludge outlet is formed in the bottom of the shell, a plurality of groups of sludge dispersing structures are arranged in the shell, and a sludge decelerating structure is communicated with the bottom of the shell.
The heating body is arranged outside the shell, and the heat preservation layer wraps the heating body.
The sludge dispersing structure comprises upper dispersing blades and lower dispersing blades, the upper dispersing blades and the lower dispersing blades are arranged from top to bottom, and the upper dispersing blades and the lower dispersing blades are fixedly connected with the output end of the power structure respectively.
The power structure comprises a motor, the motor is arranged outside the shell, a rotating rod is fixedly connected to the output end of the motor and penetrates through the side wall of the shell, a first bevel gear is fixedly connected to the output end of the rotating rod, a second bevel gear and a third bevel gear are meshed with the first bevel gear, and the second bevel gear and the third bevel gear are respectively and fixedly connected with the upper-layer dispersing blades and the lower-layer dispersing blades through connecting rods.
The sludge speed reduction structure comprises a fan and an air injection pipe, wherein the fan is arranged outside the shell, the output end of the fan is communicated with the air injection pipe, the air injection pipe penetrates through the side wall of the shell, and a plurality of spray heads are arranged on the air injection pipe.
The casing top is provided with clean structure, clean structure includes a plurality of scavenge pipes, the water inlet intercommunication water pump of scavenge pipe, the delivery port of scavenge pipe passes the casing.
The method for recovering phosphorus from sludge, which is manufactured by the technical scheme of the invention, has the advantages that: the sludge contains ferric salt, phosphate and the like, the sludge is carbonized to generate sludge carbide, the specific surface area of the sludge is increased, ferric iron is reduced to ferrous iron, the sludge carbide is subjected to acid leaching, so that the phosphate, ferrous salt and the like can be fully dissolved in an acid solution, the obtained solution is a phosphorus resource product, the sludge is treated by the method, the phosphorus in the sludge can be recovered to the maximum extent, the obtained phosphorus resource product contains ferrous salt, and ferrous iron is an important reducing agent, so that the subsequent utilization of the phosphorus resource product is facilitated; the hot gas outlet of the carbonization furnace is communicated with the flue gas treatment equipment and the combustor, the combustible gas generated by sludge carbonization enters the combustor to be combusted, and the heat generated by combustion is supplied to the carbonization furnace, so that the energy consumption is reduced, and the economic cost is saved; the heating body of the sludge drying device is wrapped outside the shell, so that the sludge is prevented from polluting the heating body, the sludge can be uniformly scattered for multiple times by the sludge dispersing structure, and the sludge decelerating structure can reduce the descending speed of the sludge so as to prolong the retention time of the sludge in the shell, so that the drying effect is good.
Drawings
FIG. 1 is a process flow diagram of a method of recovering phosphorus from sludge according to the present invention;
FIG. 2 is a schematic diagram of a system according to the present invention for use in a method for recovering phosphorus from sludge;
FIG. 3 is a schematic structural diagram of a sludge drying device according to the present invention;
1. a housing; 2. a sludge inlet; 3. a water vapor outlet; 4. a heating body; 5. a sludge dispersion structure; 6. a sludge deceleration structure; 7. a heat-insulating layer; 8. a power structure; 9. upper dispersing blades; 10. lower dispersing blades; 11. a motor; 12. a rotating rod; 13. a first bevel gear; 14. a second bevel gear; 15. a third bevel gear; 16. a connecting rod; 17. a fan; 18. a gas ejector tube; 19. a spray head; 20. a plate-and-frame filter press; 21. a sludge drying device; 22. a carbonization furnace; 23. a sludge outlet; 24. an acid reaction tank; 25. a filtration device; 26. a neutralization device; 27. cleaning the structure; 28. cleaning the tube; 29. a water pump; 30. flue gas treatment equipment; 31. a burner; 32. a dewatering device.
Detailed Description
The invention will be described in detail with reference to the accompanying drawings, and as shown in fig. 1-2, a method for recovering phosphorus from sludge, and a method for recovering phosphorus from sludge, includes the following steps:
s1, the sludge enters a dehydration device 34 for dehydration;
s2, drying the dewatered sludge in a sludge drying device 21;
s3, the dried sludge enters a carbonization furnace 22 for anoxic or anaerobic carbonization treatment, and sludge carbide and combustible gas are generated after the sludge is carbonized;
s4, transferring the sludge carbide into the acid reaction tank 24 and adding an acid solution;
s5, after the full reaction, the substances in the acid reaction tank 24 are poured into a filtering device 25 for filtering, the filtered liquid is the obtained phosphorus resource product, and the filtered solid is neutralized and recycled.
Further, in the step S1, the dewatering device 32 is a plate and frame filter press 20, the dewatering pressure of the plate and frame filter press 20 is 0.4 to 1.0MPa, the sludge stays in the plate and frame filter press 20 for 90 to 120min, and the water content of the dewatered sludge is 60 to 75%. The water content of the sludge is generally over 90 percent, and the water content of the sludge is reduced after the sludge is dehydrated by the plate-and-frame filter press 20, so that the subsequent sludge drying and sludge carbonization treatment is facilitated.
Further, in the step S2, the water content of the dried sludge is 10% to 40%. The sludge drying device adopts an indirect heating drying technology, so that the sludge is prevented from polluting a heating medium in the heating process, and the heat generated by the heating medium can be recycled.
Further, in the step S3, the carbonization temperature of the sludge is 300 to 1000 ℃, the carbonization time is 30 to 60min, the sludge contains phosphate, iron salt and the like, ferric iron in the sludge is reduced to ferrous iron after the sludge is carbonized, combustible gas generated after the sludge is carbonized is mainly hydrocarbon, the combustible gas enters the flue gas treatment device 30 along with flue gas generated by carbonization, and the combustible gas after passing through the flue gas treatment device 30 enters the combustor 31 for combustion. The heat generated by the burner 31 is supplied to the carbonization furnace 22.
Further, in the step S4, the solid-to-liquid ratio of the volume of the acid solution to the sludge carbide is greater than 150ml/g, the pH value is controlled to be 1-3, and after the sludge carbide is soaked in the acid solution, phosphate, ferrous salt and the like in the sludge carbide are dissolved in the acid solution. The obtained solution is the obtained phosphorus resource product. The acid solution can be sulfuric acid or hydrochloric acid with various concentrations, and can also be a mixed acid of sulfuric acid and hydrochloric acid. The sludge carbide is soaked in the acid solution, so that the phosphate and ferrous salt in the sludge carbide can be dissolved in the acid.
Further, in step S5, the filtered solid enters the neutralization device 26 to undergo a neutralization reaction, and the neutralized solid is recycled. In the process of sludge carbonization, a lot of carbon is generated, so that sludge carbides contain a large amount of carbon, and therefore, neutralized solids contain a large amount of carbon, so that the solids can be recycled by means of combustion and the like.
The utility model provides a recovery system of phosphorus in mud, includes plate and frame filter press 20, the export of plate and frame filter press 20 and the entry linkage of sludge drying device 21, the export of sludge drying device 21 and the entry linkage of carbonization furnace 22, the export of carbonization furnace 22 and the entry linkage of sour retort 24, the export of sour retort 24 and filter equipment 25's entry linkage, filter equipment 25's export and neutralization apparatus 26's entry linkage.
The gas outlet of carbonization furnace 22 communicates with gas treatment device 30, the outlet of gas treatment device 30 communicates with burner 31, the heat that burner 31 produced supplies with carbonization furnace 22. The combustor 31 combusts combustible gas generated in the sludge carbonization process; the hot gas after combustion is supplied to the carbonization furnace 22, ensuring the full utilization of heat.
The sludge drying device 21 comprises a shell 1, a sludge inlet 2 and a steam outlet 3 are arranged on the upper portion of the shell 1, a sludge outlet 33 is arranged at the bottom of the shell 1, sludge enters the shell 1 from the sludge inlet 2, high temperature is achieved inside the shell 1, and the sludge dried at the high temperature is discharged from the sludge outlet 33. The sludge treatment device is characterized in that a plurality of groups of sludge dispersing structures 5 are arranged inside the shell 1, and the bottom of the shell 1 is communicated with a sludge decelerating structure 6. The sludge dispersing structures 5 are arranged from top to bottom, and the sludge dispersing structures 5 can scatter sludge, so that the sludge drying effect is optimized. The sludge speed reducing structure 6 can reduce the speed of sludge descending, so that the residence time of the sludge in the shell 1 is longer, the heating time of the sludge is longer, and the drying effect is better.
The heating body 4 is wrapped outside the shell 1, and the heat preservation layer 7 is wrapped outside the heating body 4. The heat generated by the heating body 4 is conducted to the inside of the case 1. The heat preservation layer 7 is used for preserving heat of the heating body 4 and preventing heat from being dissipated.
Sludge dispersion structure 5 includes upper dispersion blade 9 and lower floor's dispersion blade 10, upper dispersion blade 9 with lower floor's dispersion blade 10 is from last to arranging down, upper dispersion blade 9 with lower floor's dispersion blade 10 respectively with power structure 8's output fixed connection. The power structure 8 drives the upper dispersing blades 9 and the lower dispersing blades 10 to rotate in opposite directions, so that sludge is better dispersed.
The power structure 8 comprises a motor 11, the motor 11 is arranged outside the shell 1, the output end of the motor 11 is fixedly connected with a rotating rod 12, the rotating rod 12 penetrates through the side wall of the shell 1, the output end of the rotating rod 12 is fixedly connected with a first bevel gear 13, a second bevel gear 14 and a third bevel gear 15 are meshed with the first bevel gear 13, and the second bevel gear 14 and the third bevel gear 15 are respectively and fixedly connected with the upper-layer dispersing blades 9 and the lower-layer dispersing blades 10 through connecting rods 16. The output end of the motor 11 drives the rotating rod 12 and the first bevel gear 13 to rotate. The axes of the second bevel gear 14 and the third bevel gear 15 are coincident and perpendicular to the axis of the first bevel gear 13, the first bevel gear 13 drives the second bevel gear 14 and the third bevel gear 15 to rotate when rotating, and the rotating directions of the second bevel gear 14 and the third bevel gear 15 are opposite. Therefore, the upper dispersing blades 9 and the lower dispersing blades 10 rotate in opposite directions.
The sludge speed reducing structure 6 comprises a fan 17 and an air injection pipe 18, wherein the fan 17 is arranged outside the shell 1, the output end of the fan 17 is communicated with the air injection pipe 18, the air injection pipe 18 penetrates through the side wall of the shell 1, and a plurality of spray heads 19 are arranged on the air injection pipe 18. The air injection pipe 18 and the spray head 19 are arranged at the lower part of the shell 1, the fan 17 blows air upwards through the air injection pipe 18 and the spray head 19, and the impact force of the air reduces the descending speed of the sludge, so that the sludge is left in the shell 1 for a longer time, and the drying effect is optimized.
The casing 1 top is provided with clean structure 27, clean structure 27 includes a plurality of scavenge pipes 28, the water inlet intercommunication water pump 29 of scavenge pipe 28, the delivery port of scavenge pipe 28 passes casing 1. The cleaning structure 27 can clean the inside of the housing 1, the cleaning pipe 28 sprays high-pressure water to clean the inside of the housing 1, and the sewage is directly discharged from the sludge outlet 33.
In the embodiment, ferric iron in the sludge is reduced into ferrous iron after the sludge is carbonized, generated sludge carbide contains phosphate, ferrous salt and the like, the specific surface area of the sludge is increased after the sludge is carbonized, the sludge carbide is subjected to acid leaching, so that the phosphate and the ferrous salt can be fully dissolved in an acid solution, the obtained solution is a phosphorus resource product, the phosphorus in the sludge can be recovered to the maximum extent by adopting the method for treating the sludge, the obtained phosphorus resource product contains the ferrous salt, and the ferrous iron is an important reducing agent, so that the subsequent utilization of the phosphorus resource product is facilitated; the gas outlet of the carbonization furnace 22 is communicated with the burner 31, the combustible gas generated by carbonizing the sludge enters the burner 31 to be combusted, and the generated heat is supplied to the carbonization furnace 22, so that the energy consumption is reduced, and the economic cost is saved; the sludge drying device 21 adopts an indirect heating technology to prevent sludge from polluting the heating body 4, adopts the sludge dispersing structure 5 to disperse the sludge, and adopts the sludge decelerating structure 6 to reduce the descending speed of the sludge so as to prolong the retention time of the sludge in the shell 1, so that the drying effect is good.
The technical solutions described above only represent the preferred technical solutions of the present invention, and some possible modifications to some parts of the technical solutions by those skilled in the art all represent the principles of the present invention, and fall within the protection scope of the present invention.
Claims (8)
1. The utility model provides a recovery system of phosphorus in mud, its characterized in that includes plate and frame filter press (20), the export of plate and frame filter press (20) and the entry linkage of sludge drying device (21), the export of sludge drying device (21) and the entry linkage of carbide furnace (22), the sludge outlet of carbide furnace (22) and the entry linkage of sour retort (24), the export of sour retort (24) and the entry linkage of filter equipment (25), the export of filter equipment (25) and the entry linkage of neutralization apparatus (26).
2. The system for recovering phosphorus from sludge according to claim 1, wherein the flue gas outlet of the carbonization furnace (22) is communicated with a flue gas treatment device (30), the outlet of the flue gas treatment device (30) is communicated with a burner (31), and the heat generated by the burner (31) is supplied to the carbonization furnace (22).
3. The method for recovering phosphorus from sludge is characterized by comprising the following steps of:
s1, the sludge enters a dehydration device (34) for dehydration;
s2, drying the dewatered sludge in a sludge drying device (21);
s3, the dried sludge enters a carbonization furnace (22) for anaerobic or anoxic carbonization treatment, and sludge carbide and combustible gas are generated after the sludge is carbonized;
s4, transferring the sludge carbide into an acid reaction tank (24) and adding an acid solution;
s5, after the full reaction, the substances in the acid reaction tank (24) are poured into a filtering device (25) for filtering, the filtered liquid is the obtained phosphorus resource product, and the filtered solid is recycled after neutralization.
4. The method for recovering phosphorus from sludge according to claim 1, wherein in the step S1, the dehydration device (34) is a plate-and-frame filter press (20), the dehydration pressure of the plate-and-frame filter press (20) is 0.4-1.0 MPa, the sludge stays in the plate-and-frame filter press (20) for 90-120 min, and the water content of the dehydrated sludge is 60-75%.
5. The method according to claim 1, wherein in step S2, the water content of the dried sludge is 10% to 40%.
6. The method for recovering phosphorus from sludge according to claim 1, wherein in step S3, the carbonization temperature of the sludge is 300-1000 ℃, the carbonization time is 30-60 min, the sludge contains phosphate, iron salt and the like, the specific surface area of the sludge is increased after carbonization, ferric iron in the sludge is reduced to ferrous iron, combustible gas generated after carbonization of the sludge is mainly hydrocarbon, the combustible gas enters the flue gas treatment equipment (30) along with flue gas generated by carbonization, and the combustible gas after passing through the flue gas treatment equipment (30) enters the combustor (31) for combustion.
7. The method according to claim 1, wherein in step S4, the acid solution is one of sulfuric acid and hydrochloric acid, the volume ratio of the acid solution to the solid-to-liquid ratio of the sludge carbide is greater than 150ml/g, the pH is controlled to be 1-3, and after the sludge carbide is soaked in the acid solution, phosphate, ferrite, and the like in the sludge are dissolved out.
8. The method for recovering phosphorus from sludge according to claim 1, wherein in step S5, the filtered solids enter a neutralization device (26) for neutralization reaction, and the neutralized solids are recycled.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010933834.3A CN112094025B (en) | 2020-09-08 | 2020-09-08 | System and method for recycling phosphorus in sludge |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010933834.3A CN112094025B (en) | 2020-09-08 | 2020-09-08 | System and method for recycling phosphorus in sludge |
Publications (2)
| Publication Number | Publication Date |
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| CN112094025A true CN112094025A (en) | 2020-12-18 |
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| CN112094025B (en) | 2024-01-30 |
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