CN113582479A - Method for solidifying and treating sludge in refuse dump - Google Patents
Method for solidifying and treating sludge in refuse dump Download PDFInfo
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- 239000010802 sludge Substances 0.000 title claims abstract description 196
- 238000000034 method Methods 0.000 title claims abstract description 57
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 63
- 238000002156 mixing Methods 0.000 claims abstract description 44
- 238000007711 solidification Methods 0.000 claims abstract description 40
- 230000008023 solidification Effects 0.000 claims abstract description 40
- 230000018044 dehydration Effects 0.000 claims abstract description 34
- 238000006297 dehydration reaction Methods 0.000 claims abstract description 34
- 238000003756 stirring Methods 0.000 claims abstract description 26
- 230000000694 effects Effects 0.000 claims abstract description 15
- 238000003860 storage Methods 0.000 claims abstract description 15
- 238000001514 detection method Methods 0.000 claims abstract description 7
- 238000001723 curing Methods 0.000 claims description 80
- 239000000463 material Substances 0.000 claims description 54
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 21
- 238000005086 pumping Methods 0.000 claims description 19
- 238000012423 maintenance Methods 0.000 claims description 17
- 230000007480 spreading Effects 0.000 claims description 12
- 238000003892 spreading Methods 0.000 claims description 12
- 238000001035 drying Methods 0.000 claims description 10
- 239000000203 mixture Substances 0.000 claims description 8
- 238000012546 transfer Methods 0.000 claims description 7
- 230000003750 conditioning effect Effects 0.000 claims description 6
- 238000007599 discharging Methods 0.000 claims description 6
- ZFXVRMSLJDYJCH-UHFFFAOYSA-N calcium magnesium Chemical compound [Mg].[Ca] ZFXVRMSLJDYJCH-UHFFFAOYSA-N 0.000 claims description 4
- 238000004364 calculation method Methods 0.000 claims description 3
- 238000011068 loading method Methods 0.000 claims description 2
- 230000000149 penetrating effect Effects 0.000 claims description 2
- 208000005156 Dehydration Diseases 0.000 abstract description 30
- 230000008569 process Effects 0.000 abstract description 15
- 230000035699 permeability Effects 0.000 abstract description 13
- 230000008859 change Effects 0.000 abstract description 3
- 238000010276 construction Methods 0.000 abstract description 3
- 238000004519 manufacturing process Methods 0.000 abstract description 3
- 239000002699 waste material Substances 0.000 abstract description 3
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- 238000012417 linear regression Methods 0.000 description 2
- 239000000843 powder Substances 0.000 description 2
- 150000003839 salts Chemical class 0.000 description 2
- RNFJDJUURJAICM-UHFFFAOYSA-N 2,2,4,4,6,6-hexaphenoxy-1,3,5-triaza-2$l^{5},4$l^{5},6$l^{5}-triphosphacyclohexa-1,3,5-triene Chemical compound N=1P(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP=1(OC=1C=CC=CC=1)OC1=CC=CC=C1 RNFJDJUURJAICM-UHFFFAOYSA-N 0.000 description 1
- 235000008733 Citrus aurantifolia Nutrition 0.000 description 1
- CBENFWSGALASAD-UHFFFAOYSA-N Ozone Chemical compound [O-][O+]=O CBENFWSGALASAD-UHFFFAOYSA-N 0.000 description 1
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- 238000006477 desulfuration reaction Methods 0.000 description 1
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- 230000006872 improvement Effects 0.000 description 1
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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
- C02F11/008—Sludge treatment by fixation or solidification
-
- 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
- C02F11/121—Treatment of sludge; Devices therefor by de-watering, drying or thickening by mechanical de-watering
-
- 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
- C02F11/121—Treatment of sludge; Devices therefor by de-watering, drying or thickening by mechanical de-watering
- C02F11/127—Treatment of sludge; Devices therefor by de-watering, drying or thickening by mechanical de-watering by centrifugation
-
- 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
- C02F11/131—Treatment of sludge; Devices therefor by de-watering, drying or thickening by heating using electromagnetic or ultrasonic waves
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (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)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Treatment Of Sludge (AREA)
Abstract
The invention discloses a method for solidifying sludge in a refuse dump, which comprises the following steps: s1: storage pit sludge, S2: carrying out centrifugal detection; s3: solidifying, mixing and stirring, namely conveying the sludge in the storage pit into a mixing and stirring device through a conveying pump, conveying the prepared solidifying agent into the mixing and stirring device, and then mixing and stirring; s4: carrying out dehydration treatment; s5: airing and maintaining, S6: and (5) sanitary landfill. The invention has short curing time, small addition amount and small change to the pH value of the sludge; the secondary pollution to the sludge is avoided, the solidification process is simplified, and the production and construction are easy; resource utilization can be carried out, and the curing effect can meet the standard requirement; the permeability of the solidified sludge meets the landfill requirement; and the conveying of the curing agent reduces the electric power waste, ensures the sludge and the curing agent to be uniformly mixed at any time, and improves the curing effect.
Description
Technical Field
The invention relates to the technical field of garbage yard treatment, in particular to a garbage yard sludge solidification treatment method.
Background
The sludge has high organic matter content, is in a colloidal floc structure, has high hydrophilicity and water retention and extremely poor dehydration performance, and even after long-time natural airing, the sludge with the water content reduced to 80 percent still has high fluidity and risk of leaching pollutants under the rainwater leaching condition, so that the sludge water retention performance is required to be improved, the sludge is efficiently dehydrated, and the strict technical definition of the sludge water content by sanitary landfill, drying incineration, anaerobic fermentation and composting is met. For sanitary landfill (in fact, most of sludge in China is subjected to sanitary landfill at present), the water content is required to be lower than 60 wt.%, and the sufficient soil mechanical strength of the sludge can be ensured only by performing anti-seepage treatment, so that the landslide phenomenon is avoided when the sludge is buried; for composting, the water content should also be lower than 60 wt.%, otherwise a large amount of auxiliary materials such as wood chips and the like are added; for anaerobic fermentation, residue dehydration is still not solved, and the residue can be landfilled hygienically only after dehydration reaches 50-60 wt%; for dry incineration, incineration is only feasible if the water content of the sludge is less than 50 wt.%, and the calorific value is greater than 1200 kcal/kg. It can be seen that the high hydrophilicity of the sludge is a control factor for restricting the harmless treatment and disposal of the sludge, so that the improvement of the water retention performance of the sludge is an important prerequisite and a key step for realizing the high-efficiency, low-cost treatment and recycling of the sludge, and the sludge solidification treatment is a method which generally pays more attention to and is used in the industrial treatment of the sludge in recent years. It is a process of cementing, blending and wrapping sludge particles in a compact inert substrate by a physical and chemical method to form a solidified body with better integrity. The inert material used for solidification is called a curing agent, and a solidified product formed by solidifying the sludge is a solidified body.
At present, the sludge solidification comprises cement solidification, lime solidification, thermoplastic solidification and polymerization solidification, and the write solidification has slow sludge drying rate; the curing effect is difficult to meet the standard requirement; the permeability of the solidified sludge can not meet the landfill requirement; the process equipment is complex, the curing agent cost is high, and the addition amount is large, so that ozone can be generated; the environment is easy to be polluted secondarily, the curing process is complex, and the production and construction are not easy; resource utilization can not be carried out basically, and before mixing the stirring, when other types of current curing agents were carried, in order to guarantee that the curing agent sprays evenly, need the independent even drive of electric power, the extravagant resource, can't guarantee to suspend at any time in the driving process, the curing agent carries excessively easily, has reduced the problem of fixed effect.
To solve the above problems. Therefore, a method for solidifying and treating the sludge in the refuse dump is provided.
Disclosure of Invention
The invention aims to provide a method for solidifying and treating sludge in a refuse dump, which can solve the problems in the background technology.
In order to achieve the purpose, the invention provides the following technical scheme: a method for solidifying and treating sludge in a refuse dump comprises the following steps:
s1: the sludge in the storage pit is used for conveying the sludge to be treated into the sludge storage pit to be treated;
s2: performing centrifugal detection, performing centrifugal dehydration on sludge to be treated, detecting the water content of the sludge after the centrifugal dehydration, and evaluating the conditioning effect and the centrifugal dehydration feasibility of the sludge conditioner;
s3: solidifying, mixing and stirring, namely conveying the sludge in the storage pit into a mixing and stirring device through a conveying pump, conveying the prepared solidifying agent into the mixing and stirring device, and then mixing and stirring;
s4: dewatering, namely pumping the sludge into mechanical dewatering equipment after the sludge passes through a mixing stirrer, and dewatering the water in the sludge to reduce the water content of the sludge;
s5: airing and maintaining, namely transferring the dewatered sludge to an airing area through transfer equipment again, and then carrying out further airing and maintaining to improve the curing effect;
s6: sanitary landfill, after the airing and maintenance cycle is finished and the landfill standard is met, the refuse landfill is transferred to the landfill site through transfer equipment again, and finally the refuse site sludge solidification treatment is completed.
Further, the calculation formula of the stock pit in S1 is
V-volume of the table, m 3; h is the height of the table body, m; s Upper-area of upper surface of stage, m 2; s lower-area of lower surface of stage, m 2.
Further, the rotational speed of the centrifugal dewatering device in the centrifugal detection in step S2 is 5000r/min, and the duration is 10 min.
Further, mix agitated vessel and include the pumping pipe and set up the reinforced driver part in the pumping pipe exit end, the terminal overcoat of drive of reinforced driver part is at the lower extreme of charging can, and charging can and reinforced driver part all set up on mixing the mixer, and all are linked together with mixing the mixer.
Further, reinforced driver part includes the guide shell and with the pivot of the outer wall connection of guide shell, and the outside of pivot is provided with the driving plate, the monolithic length of driving plate equals the diameter of pumping pipe, and the export of pumping pipe is corresponding with monolithic driving plate depressed place, the outside that the guide shell was extended in the pivot is provided with the axis of rotation, the installation shell that the conveying pipe intercommunication that the axis of rotation set up at the charging can lower extreme sets up is run through to the axis of rotation, and the end of axis of rotation is provided with first conical gear, first conical gear is connected with the second conical gear meshing that sets up in the driven conveying pipe outside that the installation shell inboard is linked together with the conveying pipe.
Furthermore, the lower end of the driven material guide pipe, which is located inside the mixing stirrer, is provided with a material scattering component, the material scattering component comprises a main feeding tray, an auxiliary feeding pipe penetrates through the main feeding tray, and the bottom of an inner hole of the auxiliary feeding pipe is flush with the bottom of a cavity formed in the inner side of the main feeding tray.
Further, spill the material part and include main feed table, the annular outer wall of main feed table is provided with out the tablet, goes out the tablet and is linked together with the inboard cavity of seting up of main feed table, and the lower extreme that is located main feed table is provided with spills the charging tray, spills the charging tray and is leaks hopper-shaped, and the up end is higher than on the ejection of compact piece, spills the charging tray and all sets up the perforation that the aperture is the same with the ejection of compact piece.
Further, the method of treating the curing agent in S3,
s31: temporarily storing the curing agent in a curing agent bin;
s32: the curing agent bin is connected with the single-screw conveyor, the curing agent is conveyed into the feeding tank (3) through the single-screw conveyor, and the conveying amount of each time is 8-10 wt.% of the wet weight of the original sludge;
s33: the sludge and the curing agent are mixed in a mixing stirrer.
Further, the curing agent is a mixture of M1 curing agent and SC curing agent based on calcium magnesium compound, and the mixing mass ratio of M1 curing agent to SC curing agent is 3: 7.
Further, the curing method in S5 is,
s51: conveying the dehydrated and solidified sludge to a maintenance area, unloading the dehydrated and solidified sludge into a specified position, and then spreading the dehydrated and solidified sludge to a thin layer with the thickness of 30 cm by using an excavator for maintenance;
s52: after the sludge is spread and maintained for 2d, stacking the solidified sludge into a strip pile by using an excavator, and turning and throwing the maintenance body by using a turning and throwing machine to promote further drying;
s53: and after turning and throwing for 5d, loading the mixture into a short barge vehicle by the excavator, and transporting the mixture out of the maintenance area.
Compared with the prior art, the invention has the beneficial effects that:
1. compared with other curing agents, the curing agent provided by the invention has the following advantages for the curing treatment method of the sludge in the garbage site, aiming at the M1 curing agent based on calcium-magnesium double salt: the solidification time is short, and the sludge can be solidified in a short period (48 hours) to meet the landfill requirement; the addition amount is small (5-10%), the change of the pH value of the sludge is small, and the generation of odor can be inhibited; the sludge conditioner is a green sludge conditioner, does not cause secondary pollution to sludge, promotes the stabilization process of the sludge, and has certain flame-retardant desulfurization effect; the curing process is simplified, and the production and construction are easy; after the immobilized sludge is degraded and stabilized for a certain period of time, a soil-like substance is formed, and resource utilization can be carried out.
2. The invention provides a solidification treatment method of sludge in a refuse dump, which aims at the advantages of the whole solidification treatment process of sludge in the refuse dump as follows: a sludge drying rate block; the curing effect is good and meets the standard requirement; the permeability of the solidified sludge meets the landfill requirement; simple process equipment and moderate curing agent cost.
3. The invention provides a refuse dump sludge solidification treatment method, wherein sludge conveyed from a pumping pipe flows into a material guide shell, a driving sheet is driven to rotate under the gravity and driving force of the sludge, a rotating shaft drives a rotating shaft to rotate, the rotating shaft drives a first bevel gear and a second bevel gear to be meshed for transmission, and finally a driven material guide pipe is driven to rotate and is uniformly scattered to the upper end of the sludge through a material scattering part, no other electric driving part is needed, the gravity and driving force of the original sludge are reasonably utilized to provide power, so that the electric power waste is reduced, the conveying of a curing agent in a mixing stirrer can be guaranteed to be stopped at any time when the sludge is stopped, the proportion of the sludge and the curing agent is not changed, the sludge and the curing agent are uniformly mixed at any time, and the curing effect is improved.
Drawings
FIG. 1 is a schematic view of the overall process of the method for treating sludge in a refuse dump according to the present invention;
FIG. 2 is a schematic view of the overall three-dimensional structure of a mixing and stirring device of the method for solidification treatment of sludge in a refuse dump according to the present invention;
FIG. 3 is a schematic view of the internal plan structure of a feeding driving part of the method for treating sludge solidification in a refuse dump according to the present invention;
FIG. 4 is a schematic view of the matching internal plane structure of a feeding driving part and a feeding tank of the method for solidification treatment of sludge in a refuse dump according to the present invention;
FIG. 5 is a schematic perspective view of a material spreading part according to a first embodiment of the method for solidifying sludge in a refuse dump of the present invention;
FIG. 6 is a schematic perspective view of a material spreading part according to a second embodiment of the method for solidification treatment of sludge in a refuse dump of the present invention;
FIG. 7 is a schematic flow chart of the curing agent treatment method in the third step of the solidification treatment method for sludge in the refuse dump according to the present invention;
FIG. 8 is a schematic flow chart of the curing method in the third step of the solidification treatment method of the sludge in the refuse dump.
FIG. 9 is a diagram 2-1 of the method for solidification treatment of sludge in a refuse dump according to the present invention: the water content of the dewatered and solidified sludge changes day by day;
FIG. 10 is a view showing the steps of FIG. 2-2 of the method for treating sludge in a refuse dump according to the present invention: the unconfined compressive strength of the dewatered and solidified sludge 7d is high;
FIG. 11 is a diagram of FIGS. 2-3 of the method for solidification treatment of sludge in a refuse dump according to the present invention: shear strength of the dewatered and solidified sludge under vertical pressure;
FIG. 12 is a diagram of FIGS. 2 to 4 of the method for solidification treatment of sludge in a refuse dump according to the present invention: the permeability coefficient of the dewatered and solidified sludge under consolidation pressure;
in the figure: 1. pumping the pipe; 2. a charging drive member; 21. a material guiding shell; 22. a rotating shaft; 23. a driving plate; 231. a feed pipe; 24. a rotating shaft; 25. a first bevel gear; 26. mounting a shell; 3. a charging tank; 31. a feed pipe; 32. a driven material guide pipe; 321. a second bevel gear; 33. a spreading component; 331. a main feed tray; 332. a secondary feed pipe; 334. discharging the material sheet; 335. a material spreading disc; 336. a cavity; 4. A mixing stirrer.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious 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.
Referring to fig. 1 and 7, a method for solidifying and treating sludge in a garbage yard comprises the steps of firstly, carrying out sludge storage pit, and conveying sludge to be treated to the sludge storage pit to be treated;
the calculation formula of the storage pit is
V-volume of the table, m 3;
h is the height of the table body, m;
s Upper-area of upper surface of stage, m 2;
s lower part, namely the area of the lower surface of the platform body, m2, is convenient for calculating the sludge solidification amount.
Secondly, performing centrifugal detection on sludge to be treated, performing centrifugal dehydration on the sludge to be treated, detecting the water content of the sludge after the centrifugal dehydration, evaluating the conditioning effect and the centrifugal dehydration feasibility of the sludge conditioner, and realizing the information of the sampled sludge as shown in the following table;
table 2-1: analysis result of basic properties of sludge
The centrifugal dehydration experiment can reflect the hydrophilic capacity of the sludge to a certain extent, evaluate the dehydration performance of the sludge and guide the design of a dehydration and solidification process route. Centrifugal dehydration is carried out on the sludge to be treated by the experiment at the rotating speed of 5000r/min, the water content of the sludge after the centrifugal dehydration is detected, the conditioning effect and the centrifugal dehydration feasibility of the sludge conditioner are evaluated, and the experimental results are shown in the following table:
tables 2 to 2: analysis result of water content of sludge by centrifugal dehydration
As can be seen from the data in Table 2-2, the hydrophilicity of the sludge is reduced, the sludge can be dewatered by more than 10% through centrifugal treatment, and the hydrophilicity of the sludge is enhanced due to the hydrophilic groups contained in the organic flocculant, so that the centrifugal dewatering performance is not improved, and therefore, the local sludge is not suitable for sludge conditioning by adopting the organic flocculant.
Secondly, carry out the mud solidification and mix the stirring, convey the mud in the storage hole to mixing stirring equipment through the delivery pump in, will keep in the inside curing agent { curing agent kind in curing agent storehouse simultaneously: the mixing mass ratio of the M1 curing agent (M1 curing agent is gelling curing agent based on calcium-magnesium double salt) to the SC curing agent is 3: 7: the wet weight of the original sludge is 8-10 wt.%, the curing agent is conveyed into a feeding tank (3) through a single screw conveyor connected with a curing agent bin, then mixing and stirring are carried out, dehydration treatment is carried out after stirring, the sludge is conveyed into mechanical dehydration equipment through a mixing stirrer and a pump, the moisture in the sludge is dehydrated, and the moisture in the sludge is reduced;
referring to fig. 2, the mixing and stirring apparatus includes a pumping pipe 1 and a feeding driving component 2 disposed at an outlet end of the pumping pipe 1, a driving end of the feeding driving component 2 is sleeved at a lower end of a feeding tank 3, and the feeding tank 3 and the feeding driving component 2 are both disposed on a mixing stirrer 4 and are both communicated with the mixing stirrer 4.
Referring to fig. 3-4, the feeding driving part 2 includes a material guiding shell 21 for protection and a rotating shaft 22 movably connected to an outer wall of the material guiding shell 21, and a plurality of driving plates 23 are disposed outside the rotating shaft 22, preferably, four driving plates 23 are disposed and are all C-shaped, a single length of the driving plate 23 is equal to a diameter of the pumping pipe 1, and an outlet of the pumping pipe 1 corresponds to a concave portion of the single driving plate 23, so that a pumping sludge pushing force only acts on the single driving plate 23, and the rotating shaft 22 rotates in a single direction more stably without being affected by resistance of reverse rotation.
The rotating shaft 22 extends out of the guide shell 21 and is provided with a rotating shaft 24, the rotating shaft 24 penetrates through an installation shell 26 which is arranged at the lower end of the feeding tank 3 and is communicated with a feeding pipe 31, the end of the rotating shaft 24 which is arranged at the inner side of the installation shell 26 is provided with a first bevel gear 25, the first bevel gear 25 is engaged with a second bevel gear 321 which is arranged at the outer side of a driven guide pipe 32 which is arranged at the inner side of the installation shell 26 and is communicated with the feeding pipe 31, the driven guide pipe 32 penetrates through the installation shell 26 and is movably connected with the connection end of the installation shell 26, sludge conveyed from the pumping pipe 1 flows into the guide shell 21, a driving sheet 23 is driven to rotate under the gravity and the driving force of the sludge, the rotating shaft 22 further drives the rotating shaft 24 to rotate, the rotating shaft 24 drives the first bevel gear 25 to be engaged with the second bevel gear 321 for transmission, and finally drives the driven guide pipe 32 to rotate without using other electric driving parts, the gravity and the driving force of the original sludge are reasonably utilized to provide power, so that the electric power waste is reduced, the curing agent in the mixing stirrer 4 can be guaranteed to be stopped to be conveyed at any time when the sludge is stopped to be conveyed, the proportion of the sludge and the curing agent is guaranteed not to be changed, the sludge and the curing agent are guaranteed to be uniformly mixed at any time, and the curing effect is improved.
Referring to fig. 5, the driven material guiding pipe 32 is provided with a material scattering component 33 at the lower end inside the mixer 4, the material scattering component 33 includes a main feeding tray 331, an auxiliary feeding pipe 332 is provided on the main feeding tray 331 in a penetrating manner, the bottom of the inner hole of the auxiliary feeding pipe 332 is flush with the bottom of the cavity 336 formed inside the main feeding tray 331, when the driven material guiding pipe 32 rotates, the curing agent powder flowing into the cavity 336 is uniformly scattered inside the mixer 4 from the auxiliary feeding pipe 332 by the centrifugal force and falls onto the sludge, and uniform material scattering is completed.
Another embodiment of the material scattering component 33 is provided, as shown in fig. 6, the material scattering component 33 includes a main feeding tray 331, a material outlet plate 334 is disposed on an annular outer wall of the main feeding tray 331, the material outlet plate 334 is communicated with a cavity 336 formed on an inner side of the main feeding tray 331, a material scattering plate 335 is disposed at a lower end of the main feeding tray 331, the material scattering plate 335 is funnel-shaped, an upper end surface of the material scattering plate is higher than the material outlet plate 334, the material scattering plate 335 and the material outlet plate 334 are both provided with through holes with the same aperture, when the driven material guiding pipe 32 rotates, the curing agent powder flowing into the cavity 336 is uniformly scattered from the material outlet plate 334 and then scattered into the mixer 4 through the material scattering plate 335, and falls onto the sludge, thereby completing uniform material scattering.
Practical results for different curing agents are as follows;
first, the change rule of water content along with maintenance time
3 curing agents M1, A1 and SC which have good dehydration and drying effects and easily obtained raw materials are selected, the water content is lower than 60% after 3 days, and the experimental result is shown in the following figure 2-1. 2-4, the water content of the dewatered sludge is lower than or equal to 50%.
Law of unconfined compressive strength changing with curing time
Curing at room temperature for 7 days by using M1 and SC curing agent with better dehydration performance, and measuring unconfined compressive strength as shown in the following chart:
as can be seen from FIGS. 2-2, the sludge solidification strength increased with the addition of M1 and SC dewatering solidifying agent. When the addition ratio of M1 and SC is 8 percent, the compressive strength is also rapidly increased to 50kN/M2Above, 105.13kN/m respectively2And 189.11kN/m2。
Third, shear strength and permeability coefficient
The SC dehydration curing agent with better dehydration curing performance is added according to 8 percent of the wet basis weight of the sludge, the dehydrated and cured sludge is obtained by curing in a special cutting ring for 7 days, and the measurement results of the shear strength and the permeability coefficient under the vertical pressure are shown in the following figures 2-3.
As can be seen from fig. 2 to 3, as the vertical pressure increases, the shear strength of the dewatered and solidified sludge also increases, and by linear regression, the shear strength at each vertical pressure can be predicted. When the vertical pressure is 50kN/m2Then, the shear strength of the dewatered and solidified sludge was calculated to be 29.93kN/m2. The compressive strength of the dewatered and solidified sludge is more than 50kN/m2Therefore, the SC dehydration curing agent is added according to the weight ratio of 8 percent of the wet sludge, and the dehydrated and cured sludge obtained after 7d of curing can meet the condition that the shear strength is more than 25KN/m2The technical index requirements of (1).
As can be seen from FIGS. 2 to 4, the permeability coefficient of the dewatered and solidified sludge rapidly decreases with the increase of the consolidation pressureAt a consolidation pressure of more than 100kN/m2When the sludge permeability coefficient is reduced to 10-8-10-7cm/s. By linear regression, the consolidation pressure can be predicted to be 0kN/m2The measured value of the sludge permeability coefficient is 10-7-10-6cm/s, and the permeability coefficient of the completely uncompacted original state dewatered and solidified sludge is between 10 because the sludge is uniformly fixed in a cutting ring for compaction pretreatment before the permeability coefficient is measured-6-10-5cm/s, meets the technical index requirements.
The main standard index requirements of mixed landfill argillaceous substance of sludge disposal of urban sewage treatment plants (GB/T23485-2009) are shown in the following table.
Tables 2 to 3: main standard index requirement of solidified sludge
Tables 2 to 4: main property index of dewatered and solidified sludge
Comparing the data in the tables 2-4 with the standard values in the tables 2-3, the experimental result can meet the landfill standard requirement when the adding amount of M1 and SC is 8 percent of the wet basis mass of the sludge with the water content of 90 percent and the room temperature maintenance is 7 days;
the necessary conclusions of different sludge dewatering and solidifying treatment processes are summarized in the following table.
TABLE 2-5 different sludge dewatering and solidifying treatment technical method selection
As can be seen from tables 2-5, the mixing curing agent of M1 and SC used in the experiment has a great advantage in sludge drying rate, curing effect, permeability of cured sludge, process equipment and curing agent cost compared with other curing effects.
Referring to fig. 8, then, drying and curing the dehydrated sludge, transferring the dehydrated sludge to a drying area through transfer equipment, transferring the dehydrated and cured sludge to a curing area and unloading the same to a specified position, and then spreading the same to a thin layer with the thickness of 20-40 cm (preferably 30 cm) by an excavator; after paving and maintaining for 1-3d (preferably 2d), stacking the solidified sludge into a strip pile by using an excavator, and turning and throwing the maintenance body by using a turner to promote further drying; after turning for 4-7 days (preferably 5 days), the excavator is loaded into the short barge and transported out of the curing area to improve the curing effect.
The material discharging parameters after the airing and curing after the experiment are as follows: the water content is less than 60%, the unconfined compressive strength is more than or equal to 50kN/m2, the shear strength of the cross plate is more than or equal to 25kN/m2, and the permeability coefficient is in the order of magnitude of 10 < -6 > to 10 < -5 > cm/s.
And finally, sanitary landfill is carried out, after the airing and maintenance period is up and the landfill standard is met, the sludge is transferred to the landfill site through transfer equipment, and finally the solidification treatment of the sludge in the refuse dump is completed.
In summary, the following steps: the invention relates to a solidification treatment method of sludge in a garbage yard, which comprises the steps of storing sludge in a pit, conveying the sludge to be treated into a sludge storage pit to be treated; performing centrifugal detection, performing centrifugal dehydration on sludge to be treated, detecting the water content of the sludge after the centrifugal dehydration, and evaluating the conditioning effect and the centrifugal dehydration feasibility of the sludge conditioner; solidifying, mixing and stirring, namely conveying the sludge in the storage pit into a mixing and stirring device through a conveying pump, conveying the prepared solidifying agent into the mixing and stirring device, and then mixing and stirring; the sludge conveyed from the pumping pipe 1 flows into the material guide shell 21, the driving piece 23 is driven to rotate under the gravity and the driving force of the sludge, the rotating shaft 22 drives the rotating shaft 24 to rotate, the rotating shaft 24 drives the first bevel gear 25 to be meshed with the second bevel gear 321 for transmission, and finally the driven material guide pipe 32 is driven to rotate, no additional electric driving part is needed for dehydration treatment, the sludge is pumped into mechanical dehydration equipment after passing through a mixing stirrer, the moisture in the sludge is dehydrated, and the moisture content of the sludge is reduced; sunning maintenance, the mud of handling the dehydration is transported the sunning district through transfer device once more, carries out further sunning maintenance again, improves solidification effect, and the solidified sludge of the ejection of compact all reaches the requirement behind the final sunning maintenance, realizes treating the landfill of the mud.
It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be able to cover the technical solutions and the inventive concepts of the present invention within the technical scope of the present invention.
Claims (10)
1. A method for solidifying and treating sludge in a refuse dump is characterized by comprising the following steps:
s1: the sludge in the storage pit is used for conveying the sludge to be treated into the sludge storage pit to be treated;
s2: performing centrifugal detection, performing centrifugal dehydration on sludge to be treated, detecting the water content of the sludge after the centrifugal dehydration, and evaluating the conditioning effect and the centrifugal dehydration feasibility of the sludge conditioner;
s3: solidifying, mixing and stirring, namely conveying the sludge in the storage pit into a mixing and stirring device through a conveying pump, conveying the prepared solidifying agent into the mixing and stirring device, and then mixing and stirring;
s4: dewatering, namely pumping the sludge into mechanical dewatering equipment after the sludge passes through a mixing stirrer, and dewatering the water in the sludge to reduce the water content of the sludge;
s5: airing and maintaining, namely transferring the dewatered sludge to an airing area through transfer equipment again, and then carrying out further airing and maintaining to improve the curing effect;
s6: sanitary landfill, after the airing and maintenance cycle is finished and the landfill standard is met, the refuse landfill is transferred to the landfill site through transfer equipment again, and finally the refuse site sludge solidification treatment is completed.
2. The solidification treatment method of sludge in a refuse dump according to claim 1, wherein the calculation formula of the storage pit in S1 is
V-volume of the table, m 3; h is the height of the table body, m; s Upper-area of upper surface of stage, m 2; s lower-area of lower surface of stage, m 2.
3. The solidification treatment method for sludge in the garbage yard according to claim 1, wherein the rotation speed of the centrifugal dehydration device in the centrifugal detection in step S2 is 5000r/min, and the duration time is 10 min.
4. The solidification treatment method for the sludge in the garbage yard according to claim 1, wherein the mixing and stirring device comprises a pumping pipe (1) and a feeding driving part (2) arranged at the outlet end of the pumping pipe (1), the driving end of the feeding driving part (2) is sleeved at the lower end of the feeding tank (3), and the feeding tank (3) and the feeding driving part (2) are both arranged on the mixing and stirring machine (4) and are both communicated with the mixing and stirring machine (4).
5. The solidification treatment method for the sludge in the garbage yard according to claim 4, wherein the feeding driving part (2) comprises a material guiding shell (21) and a rotating shaft (22) connected with the outer wall of the material guiding shell (21), and the outer side of the rotating shaft (22) is provided with a driving sheet (23), the length of a single sheet of the driving sheet (23) is equal to the diameter of the pumping pipe (1), the outlet of the pumping pipe (1) corresponds to the sunken part of the driving sheet (23) of the single sheet, the rotating shaft (22) extends out of the guide shell (21) and is provided with a rotating shaft (24), the rotating shaft (24) penetrates through a mounting shell (26) which is communicated and connected with a feeding pipe (31) arranged at the lower end of the feeding tank (3), and the tail end of the rotating shaft (24) is provided with a first bevel gear (25), and the first bevel gear (25) is meshed and connected with a second bevel gear (321) which is arranged at the outer side of a driven material guide pipe (32) communicated with the feeding pipe (31) and arranged at the inner side of the mounting shell (26).
6. The solidification treatment method for the sludge in the refuse dump according to claim 5, wherein the lower end of the driven material guiding pipe (32) in the mixing agitator (4) is provided with a material scattering component (33), the material scattering component (33) comprises a main feeding tray (331), an auxiliary feeding pipe (332) is arranged on the main feeding tray (331) in a penetrating way, and the bottom of the inner hole of the auxiliary feeding pipe (332) is equal to the bottom of the cavity (336) formed in the inner side of the main feeding tray (331).
7. The solidification treatment method for the sludge in the refuse dump according to claim 6, wherein the material spreading part (33) comprises a main feeding tray (331), the annular outer wall of the main feeding tray (331) is provided with a material discharging sheet (334), the material discharging sheet (334) is communicated with a cavity (336) formed in the inner side of the main feeding tray (331), the lower end of the main feeding tray (331) is provided with a material spreading disc (335), the material spreading disc (335) is funnel-shaped, the upper end surface of the material spreading disc is higher than the material discharging sheet (334), and the material spreading disc (335) and the material discharging sheet (334) are provided with through holes with the same aperture.
8. The solidification treatment method of sludge in a refuse dump according to claim 1, wherein the treatment method of the solidifying agent in S3,
s31: temporarily storing the curing agent in a curing agent bin;
s32: the curing agent bin is connected with the single-screw conveyor, the curing agent is conveyed into the feeding tank (3) through the single-screw conveyor, and the conveying amount of each time is 8-10 wt.% of the wet weight of the original sludge;
s33: the sludge and the curing agent are mixed in a mixing stirrer.
9. The method for curing the sludge in the refuse dump according to claim 8, wherein the curing agent is a mixture of M1 curing agent and SC curing agent based on calcium magnesium compound, and the mixing mass ratio of M1 curing agent to SC curing agent is 3: 7.
10. The solidification treatment method of sludge in a refuse dump according to claim 1, wherein the curing method in S5 is,
s51: conveying the dehydrated and solidified sludge to a maintenance area, unloading the dehydrated and solidified sludge into a specified position, and then spreading the dehydrated and solidified sludge to a thin layer with the thickness of 30 cm by using an excavator for maintenance;
s52: after the sludge is spread and maintained for 2d, stacking the solidified sludge into a strip pile by using an excavator, and turning and throwing the maintenance body by using a turning and throwing machine to promote further drying;
s53: and after turning and throwing for 5d, loading the mixture into a short barge vehicle by the excavator, and transporting the mixture out of the maintenance area.
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