CN111187047A - Method for treating waste sludge - Google Patents
Method for treating waste sludge Download PDFInfo
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- CN111187047A CN111187047A CN202010150910.3A CN202010150910A CN111187047A CN 111187047 A CN111187047 A CN 111187047A CN 202010150910 A CN202010150910 A CN 202010150910A CN 111187047 A CN111187047 A CN 111187047A
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- 239000010802 sludge Substances 0.000 title claims abstract description 101
- 238000000034 method Methods 0.000 title claims abstract description 43
- 239000002699 waste material Substances 0.000 title claims abstract description 34
- 239000002689 soil Substances 0.000 claims abstract description 113
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 40
- 238000003756 stirring Methods 0.000 claims abstract description 26
- 230000008569 process Effects 0.000 claims abstract description 17
- 239000000843 powder Substances 0.000 claims abstract description 9
- 238000007664 blowing Methods 0.000 claims abstract description 6
- 239000000203 mixture Substances 0.000 claims abstract description 6
- 239000012535 impurity Substances 0.000 claims abstract description 4
- 238000002156 mixing Methods 0.000 claims description 36
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 32
- 239000000463 material Substances 0.000 claims description 32
- 239000003583 soil stabilizing agent Substances 0.000 claims description 16
- ODINCKMPIJJUCX-UHFFFAOYSA-N Calcium oxide Chemical compound [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 claims description 14
- 229910019142 PO4 Inorganic materials 0.000 claims description 10
- 229910000831 Steel Inorganic materials 0.000 claims description 10
- 235000003891 ferrous sulphate Nutrition 0.000 claims description 10
- 239000011790 ferrous sulphate Substances 0.000 claims description 10
- 239000000835 fiber Substances 0.000 claims description 10
- 239000010881 fly ash Substances 0.000 claims description 10
- BAUYGSIQEAFULO-UHFFFAOYSA-L iron(2+) sulfate (anhydrous) Chemical compound [Fe+2].[O-]S([O-])(=O)=O BAUYGSIQEAFULO-UHFFFAOYSA-L 0.000 claims description 10
- 229910000359 iron(II) sulfate Inorganic materials 0.000 claims description 10
- NBIIXXVUZAFLBC-UHFFFAOYSA-K phosphate Chemical compound [O-]P([O-])([O-])=O NBIIXXVUZAFLBC-UHFFFAOYSA-K 0.000 claims description 10
- 239000010452 phosphate Substances 0.000 claims description 10
- 239000010959 steel Substances 0.000 claims description 10
- 239000011398 Portland cement Substances 0.000 claims description 9
- 239000004094 surface-active agent Substances 0.000 claims description 8
- 239000000292 calcium oxide Substances 0.000 claims description 7
- 235000012255 calcium oxide Nutrition 0.000 claims description 7
- 239000000701 coagulant Substances 0.000 claims description 7
- 239000002270 dispersing agent Substances 0.000 claims description 7
- 239000007921 spray Substances 0.000 claims description 6
- 238000010276 construction Methods 0.000 claims description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 25
- 239000011343 solid material Substances 0.000 description 18
- 238000013329 compounding Methods 0.000 description 8
- 239000011344 liquid material Substances 0.000 description 8
- 238000005507 spraying Methods 0.000 description 8
- 239000011147 inorganic material Substances 0.000 description 7
- 239000007788 liquid Substances 0.000 description 7
- 235000017166 Bambusa arundinacea Nutrition 0.000 description 6
- 235000017491 Bambusa tulda Nutrition 0.000 description 6
- 241001330002 Bambuseae Species 0.000 description 6
- 235000015334 Phyllostachys viridis Nutrition 0.000 description 6
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 6
- 238000010521 absorption reaction Methods 0.000 description 6
- 239000011425 bamboo Substances 0.000 description 6
- 229910010272 inorganic material Inorganic materials 0.000 description 6
- 235000008733 Citrus aurantifolia Nutrition 0.000 description 5
- 235000011941 Tilia x europaea Nutrition 0.000 description 5
- 239000004568 cement Substances 0.000 description 5
- 239000004571 lime Substances 0.000 description 5
- 230000000694 effects Effects 0.000 description 4
- 229910001385 heavy metal Inorganic materials 0.000 description 4
- 238000012360 testing method Methods 0.000 description 4
- 238000005336 cracking Methods 0.000 description 3
- 230000005012 migration Effects 0.000 description 3
- 238000013508 migration Methods 0.000 description 3
- 239000003960 organic solvent Substances 0.000 description 3
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 description 3
- 239000002245 particle Substances 0.000 description 3
- 239000000377 silicon dioxide Substances 0.000 description 3
- 235000012239 silicon dioxide Nutrition 0.000 description 3
- 238000005054 agglomeration Methods 0.000 description 2
- 230000002776 aggregation Effects 0.000 description 2
- 238000010009 beating Methods 0.000 description 2
- 210000000988 bone and bone Anatomy 0.000 description 2
- 230000000052 comparative effect Effects 0.000 description 2
- 239000006185 dispersion Substances 0.000 description 2
- 238000009826 distribution Methods 0.000 description 2
- 238000001556 precipitation Methods 0.000 description 2
- 238000001179 sorption measurement Methods 0.000 description 2
- 230000009471 action Effects 0.000 description 1
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- 238000006243 chemical reaction Methods 0.000 description 1
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- 230000007547 defect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 230000008014 freezing Effects 0.000 description 1
- 238000007710 freezing Methods 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000011368 organic material Substances 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 230000002787 reinforcement Effects 0.000 description 1
- 238000007711 solidification Methods 0.000 description 1
- 230000008023 solidification Effects 0.000 description 1
- 239000003381 stabilizer Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Images
Classifications
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/02—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing hydraulic cements other than calcium sulfates
- C04B28/10—Lime cements or magnesium oxide cements
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28C—PREPARING CLAY; PRODUCING MIXTURES CONTAINING CLAY OR CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28C1/00—Apparatus or methods for obtaining or processing clay
- B28C1/10—Apparatus or methods for obtaining or processing clay for processing clay-containing substances in non-fluid condition ; Plants
- B28C1/14—Apparatus or methods for obtaining or processing clay for processing clay-containing substances in non-fluid condition ; Plants specially adapted for homogenising, comminuting or conditioning clay in non-fluid condition or for separating undesired admixtures therefrom
- B28C1/18—Apparatus or methods for obtaining or processing clay for processing clay-containing substances in non-fluid condition ; Plants specially adapted for homogenising, comminuting or conditioning clay in non-fluid condition or for separating undesired admixtures therefrom for comminuting clay lumps
- B28C1/187—Apparatus or methods for obtaining or processing clay for processing clay-containing substances in non-fluid condition ; Plants specially adapted for homogenising, comminuting or conditioning clay in non-fluid condition or for separating undesired admixtures therefrom for comminuting clay lumps using co-operating rotating elements, e.g. cutters
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28C—PREPARING CLAY; PRODUCING MIXTURES CONTAINING CLAY OR CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28C5/00—Apparatus or methods for producing mixtures of cement with other substances, e.g. slurries, mortars, porous or fibrous compositions
- B28C5/08—Apparatus or methods for producing mixtures of cement with other substances, e.g. slurries, mortars, porous or fibrous compositions using driven mechanical means affecting the mixing
- B28C5/10—Mixing in containers not actuated to effect the mixing
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28C—PREPARING CLAY; PRODUCING MIXTURES CONTAINING CLAY OR CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28C7/00—Controlling the operation of apparatus for producing mixtures of clay or cement with other substances; Supplying or proportioning the ingredients for mixing clay or cement with other substances; Discharging the mixture
- B28C7/04—Supplying or proportioning the ingredients
- B28C7/06—Supplying the solid ingredients, e.g. by means of endless conveyors or jigging conveyors
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28C—PREPARING CLAY; PRODUCING MIXTURES CONTAINING CLAY OR CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28C7/00—Controlling the operation of apparatus for producing mixtures of clay or cement with other substances; Supplying or proportioning the ingredients for mixing clay or cement with other substances; Discharging the mixture
- B28C7/04—Supplying or proportioning the ingredients
- B28C7/12—Supplying or proportioning liquid ingredients
-
- 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
- C02F11/13—Treatment of sludge; Devices therefor by de-watering, drying or thickening by heating
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/00474—Uses not provided for elsewhere in C04B2111/00
- C04B2111/00767—Uses not provided for elsewhere in C04B2111/00 for waste stabilisation purposes
- C04B2111/00784—Uses not provided for elsewhere in C04B2111/00 for waste stabilisation purposes for disposal only
Abstract
The invention discloses a method for treating waste sludge, which comprises the following steps: 1) taking out the sludge, and removing garbage impurities in the sludge by using a grid; 2) in the process of removing the garbage, building residue soil is added into the sludge layer by layer, namely the sludge layer and the building residue soil layer are paved at intervals, the standing is carried out for 1.5 to 2 hours, and then the mixture is stirred for 15 to 20 minutes and then is carried out for 30 minutes; 3) in the standing process, blowing the sludge by an air heater; 4) and uniformly adding a soil curing agent into the sludge, and stirring at the speed of 60-70 r/min for 45-60 min. The sludge treatment method solves the problem that the crushed powder of the waste building is difficult to utilize by combining the building waste residue soil and the soil curing agent, can improve the compressive strength and the water stability of the sludge, can solidify the sludge, can be used on the spot, and can be used as backfill soil and foundation cushion layers in the engineering by landfill.
Description
Technical Field
The invention relates to the field of building waste soil and river sludge treatment, in particular to a method for treating waste sludge.
Background
Soil bodies such as tunnel sludge, river channel dredging, underground engineering waste soil and the like are difficult to treat and utilize due to high water content, poor stability, low compressive strength and possibly excessive heavy metal content. Therefore, the lime soil, the cement soil and the like are widely applied to sludge treatment of some hydraulic engineering and agricultural engineering due to low manufacturing cost and simple construction. In practice, however, it has been found that lime consolidation has low early strength and slow strength development; cement reinforcement has a large shrinkage and is easy to crack, and therefore, a soil stabilizer is widely used.
The soil stabilizer is a novel energy-saving environment-friendly engineering material which is synthesized by various inorganic and organic materials and used for curing various soils, the space between soil particles is reduced under the action of external pressure, and a series of physical and chemical reactions are generated to achieve the effects of improving contact surface characteristics, filling gaps between particles and generating new substances to agglomerate the soil particles.
However, the traditional soil stabilizer cannot meet the engineering requirements in the aspect of durability, and has the defects of low strength, poor crack resistance, poor freezing resistance and the like.
Disclosure of Invention
The invention aims to solve the technical problems that the existing soil curing agent cannot meet the requirements of engineering in the aspect of durability, has low strength and poor crack resistance and frost resistance, and aims to provide a method for treating waste sludge.
The invention is realized by the following technical scheme:
a method for treating waste sludge comprises the following steps: 1) taking out the sludge, and removing garbage impurities in the sludge by using a grid; 2) in the process of removing the garbage, building residue soil is added into the sludge layer by layer, namely the sludge layer and the building residue soil layer are paved at intervals, the standing is carried out for 1.5 to 2 hours, and then the mixture is stirred for 15 to 20 minutes and then is carried out for 30 minutes; 3) in the standing process, blowing the sludge by an air heater; 4) uniformly adding a soil curing agent into the sludge, and stirring at the speed of 60-70 r/min for 45-60 min; the soil curing agent comprises the following components in percentage by mass: 40-50 parts of Portland cement, 10-15 parts of quick lime, 30-40 parts of fly ash, 3-4 parts of short steel fiber, 6-8 parts of phosphate, 4-7 parts of ferrous sulfate, 10-12 parts of ethanol, 1-2 parts of a coagulant, 2-3 parts of a dispersant and 2-3 parts of a surfactant.
The sludge treatment method solves the problem that the crushed powder of the waste building is difficult to utilize by combining the building waste residue soil and the soil curing agent, can improve the compressive strength and the water stability of the sludge, can solidify the sludge, can be used on the spot, and can be used as backfill soil and foundation cushion layers in the engineering by landfill. According to the invention, firstly, the sludge layer and the building sludge layer are laid at intervals while the garbage is removed, even if the building sludge is uniformly distributed in the height direction of the sludge, the water in the sludge can be quickly adsorbed in the standing process, the building sludge and the sludge are fully mixed by stirring after the standing is finished, and then the water and the performance in the sludge are more fully absorbed by blowing through hot air, so that the water content in the sludge is reduced; after the sludge layer is dewatered by building residue soil, a soil curing agent is added, so that the sludge soil is cured, and the crack resistance is improved. The soil curing agent adopts various inorganic materials such as cement, lime, fly ash and the like, and fully utilizes active components such as silicon dioxide, aluminum oxide and the like in the inorganic materials to generate a hydraulic cementing material, so that the cementing property of soil is improved, the soil quality is improved, the toughness of the soil curing agent can be obviously improved by adding short steel fibers, the problem of easy cracking of the traditional curing material is solved, the compressive strength of the soil is high, ferrous sulfate is matched with phosphate, heavy metal adsorption and precipitation can be induced, the biotoxicity and the migration capability in the soil are reduced, and the soil curing agent is economic and environment-friendly; the ethanol is a liquid, can improve the uniformity of the whole soil curing agent when being mixed with soil when being added into the soil curing agent, and is a volatile solution, so the ethanol is easy to volatilize after being added into the soil, the humidity of the soil is not influenced, and simultaneously the ethanol is used as an organic solvent, can improve the binding force between the soil curing agent and the soil, and improve the water stability, thereby curing engineering sludge, waste soil and the like, enabling the sludge to be used on site, and being used as backfill soil, foundation cushions and the like in engineering in landfill.
The building residue soil is broken powder of waste buildings, is difficult to utilize for other purposes, can just utilize waste, and has stronger water absorption for the powder.
The thickness ratio of the sludge layer to the building residue soil layer during alternate laying is 3:1, and the water content of the sludge soil can reach a better degree under the thickness ratio.
The soil stabilizer comprises the following components in percentage by mass: 45 parts of Portland cement, 12 parts of quick lime, 35 parts of fly ash, 4 parts of short steel fiber, 8 parts of phosphate, 6 parts of ferrous sulfate, 12 parts of ethanol, 2 parts of a coagulant, 3 parts of a dispersing agent and 3 parts of a surfactant.
The adding method of the soil stabilizer comprises the following steps: 1) dividing the sludge into a plurality of square structures, drawing a circular annular cavity by taking the center of each square as the center of a circle, adding a soil curing agent into the annular cavity, and standing for 30 min; 2) and then stirring the sludge of each square in sequence, wherein the concrete steps comprise firstly stirring one square, then stirring the sludge of the second square after stirring the sludge of the first square, and repeating the steps until all the sludge is stirred for 1 hour.
The method can fully mix the soil curing agent and the silt soil, thereby improving the uniformity of soil curing and improving the compressive strength.
The compounding device of soil curing agent includes the compounding section of thick bamboo of vertical setting, the top of compounding section of thick bamboo is equipped with into the hopper, be equipped with the dwang that the level set up in going into the hopper, the dwang can rotate around self axis, there is the puddler along length direction vertical distribution on the dwang, the top of compounding section of thick bamboo is the grid structure, the inside crushing roller that is equipped with two vertical settings side by side of compounding section of thick bamboo, the bottom evenly distributed of compounding section of thick bamboo has the discharge opening, the below of compounding section of thick bamboo is equipped with the mixing box that is the round platform shape about little, be equipped with the spray tube perpendicularly in proper order along.
According to the mixing device, solid materials and liquid materials are added in different modes, so that the solid materials and the solid materials can be fully mixed, the uniformity is improved, meanwhile, the uniform dispersion of the liquid materials in the solid materials can be improved in a spraying mode, and the agglomeration is avoided. When the mixing device is used, firstly, all solid materials to be mixed are completely filled in a container, then all the solid materials are poured into the container from the material inlet hopper, the rotating rod is driven to rotate by the motor in the pouring process of the materials, so that the stirring rod is driven to move, the poured and downward moving materials are stirred and are dispersed in a beating mode in the moving process, therefore, the materials are subjected to a preliminary dispersing and mixing effect in the material inlet hopper, the materials uniformly penetrate through a grid structure at the top of the mixing cylinder after passing through the material inlet hopper, namely, the materials uniformly fall from the top of the mixing cylinder, then, in the falling process, the two crushing rollers rotate to roll, crush and disperse the materials, and the solid materials can be further dispersed and mixed; finally, the solid materials fall into the mixing box after being fully dispersed and mixed, and meanwhile, the liquid materials are sprayed in the falling materials in a liquid spraying mode from the spraying pipe, so that the mixing uniformity of the solid materials and the liquid materials is improved, and the quality of the curing agent is improved. The specific structure of the driving device for driving the rotating rod or the crushing roller can adopt the existing structure, and the specific structure of the spray pipe for spraying the liquid is also the prior art, so the detailed description is not provided herein.
The outer wall of the stirring rod is covered with a triangular bulge, so that the effect of dispersing materials can be further achieved; the stirring rod is made of rubber materials, has certain elasticity, can slightly deform in the movement process to cause the reciprocating motion of the end part, and is more favorable for dispersing and mixing materials.
Compared with the prior art, the invention has the following advantages and beneficial effects:
1. according to the method for treating the waste sludge, the problem that the broken powder of the waste building is difficult to utilize is solved through the combination of the waste building residue soil and the soil curing agent, the compressive strength and the water stability of the sludge can be improved, the sludge can be cured and used on the spot and buried as backfill soil and foundation cushion layers in the engineering;
2. according to the method for treating the waste sludge, multiple inorganic materials such as cement, lime, fly ash and the like are adopted, active components such as silicon dioxide, aluminum oxide and the like in the inorganic materials are fully utilized, and a hydraulic cementing material can be generated, so that the cementing property of soil is improved, the soil quality is improved, the toughness of a soil curing agent can be obviously improved due to the addition of short steel fibers, the problem of easy cracking of the traditional curing material is solved, and the compressive strength of the soil is high;
3. according to the method for treating the waste sludge, the ferrous sulfate is matched with the phosphate, so that heavy metal can be induced to be adsorbed and precipitated, the biotoxicity and the migration capacity in the soil are reduced, and the method is economical and environment-friendly; the ethanol belongs to liquid, can improve the uniformity of the whole soil stabilizer when being mixed with soil when being added into the soil stabilizer, and belongs to volatile solution, so the ethanol is easy to volatilize after being added into the soil, the humidity of the soil cannot be influenced, and simultaneously the ethanol is used as organic solvent, so the binding force between the soil stabilizer and the soil can be improved, and the water stability is improved.
Drawings
The accompanying drawings, which are included to provide a further understanding of the embodiments of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the principles of the invention. In the drawings:
FIG. 1 is a schematic structural diagram of a mixing device according to the present invention.
Reference numbers and corresponding part names in the drawings:
1-mixing barrel, 2-feeding hopper, 3-rotating rod, 4-stirring rod, 5-crushing roller, 6-mixing box and 7-spray pipe.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail below with reference to examples, and the exemplary embodiments and descriptions thereof are only used for explaining the present invention and are not used as limitations of the present invention.
Example 1
A method for treating waste sludge comprises the following steps: 1) taking out the sludge, and removing garbage impurities in the sludge by using a grid; 2) in the process of removing the garbage, building residue soil is added into the sludge layer by layer, namely the sludge layer and the building residue soil layer are paved at intervals, the standing is carried out for 1.5 to 2 hours, and then the mixture is stirred for 15 to 20 minutes and then is carried out for 30 minutes; 3) in the standing process, blowing the sludge by an air heater; 4) uniformly adding a soil curing agent into the sludge, and stirring at the speed of 60-70 r/min for 45-60 min; the soil curing agent comprises the following components in percentage by mass: 45 parts of Portland cement, 12 parts of quick lime, 35 parts of fly ash, 4 parts of short steel fiber, 8 parts of phosphate, 6 parts of ferrous sulfate, 12 parts of ethanol, 2 parts of a coagulant, 3 parts of a dispersing agent and 3 parts of a surfactant.
The sludge treatment method solves the problem that the crushed powder of the waste building is difficult to utilize by combining the building waste residue soil and the soil curing agent, can improve the compressive strength and the water stability of the sludge, can solidify the sludge, can be used on the spot, and can be used as backfill soil and foundation cushion layers in the engineering by landfill. According to the invention, firstly, the sludge layer and the building sludge layer are laid at intervals while the garbage is removed, even if the building sludge is uniformly distributed in the height direction of the sludge, the water in the sludge can be quickly adsorbed in the standing process, the building sludge and the sludge are fully mixed by stirring after the standing is finished, and then the water and the performance in the sludge are more fully absorbed by blowing through hot air, so that the water content in the sludge is reduced; after the sludge layer is dewatered by building residue soil, a soil curing agent is added, so that the sludge soil is cured, and the crack resistance is improved. The soil curing agent adopts various inorganic materials such as cement, lime, fly ash and the like, and fully utilizes active components such as silicon dioxide, aluminum oxide and the like in the inorganic materials to generate a hydraulic cementing material, so that the cementing property of soil is improved, the soil quality is improved, the toughness of the soil curing agent can be obviously improved by adding short steel fibers, the problem of easy cracking of the traditional curing material is solved, the compressive strength of the soil is high, ferrous sulfate is matched with phosphate, heavy metal adsorption and precipitation can be induced, the biotoxicity and the migration capability in the soil are reduced, and the soil curing agent is economic and environment-friendly; the ethanol is a liquid, can improve the uniformity of the whole soil curing agent when being mixed with soil when being added into the soil curing agent, and is a volatile solution, so the ethanol is easy to volatilize after being added into the soil, the humidity of the soil is not influenced, and simultaneously the ethanol is used as an organic solvent, can improve the binding force between the soil curing agent and the soil, and improve the water stability, thereby curing engineering sludge, waste soil and the like, enabling the sludge to be used on site, and being used as backfill soil, foundation cushions and the like in engineering in landfill.
The building residue soil is broken powder of waste buildings, is difficult to utilize for other purposes, can just utilize waste, and has stronger water absorption for the powder.
The thickness ratio of the sludge layer to the building residue soil layer during alternate laying is 3:1, and the water content of the sludge soil can reach a better degree under the thickness ratio.
The adding method of the soil stabilizer comprises the following steps: 1) dividing the sludge into a plurality of square structures, drawing a circular annular cavity by taking the center of each square as the center of a circle, adding a soil curing agent into the annular cavity, and standing for 30 min; 2) and then stirring the sludge of each square in sequence, wherein the concrete steps comprise firstly stirring one square, then stirring the sludge of the second square after stirring the sludge of the first square, and repeating the steps until all the sludge is stirred for 1 hour.
The method can fully mix the soil curing agent and the silt soil, thereby improving the uniformity of soil curing and improving the compressive strength.
Example 2
The difference between the embodiment and the embodiment 1 is that the soil stabilizer comprises the following components in percentage by mass: 40 parts of Portland cement, 10 parts of quick lime, 30-parts of fly ash, 3 parts of short steel fiber, 6 parts of phosphate, 4 parts of ferrous sulfate, 10 parts of ethanol, 1 part of coagulant, 2 parts of dispersant and 2 parts of surfactant.
Example 3
The difference between the embodiment and the embodiment 1 is that the soil stabilizer comprises the following components in percentage by mass: 50 parts of Portland cement, 15 parts of quick lime, 40 parts of fly ash, 4 parts of short steel fiber, 8 parts of phosphate, 7 parts of ferrous sulfate, 12 parts of ethanol, 2 parts of a coagulant, 3 parts of a dispersing agent and 3 parts of a surfactant.
Comparative example 1
Ordinary Portland cement 32.5 is adopted as a curing agent, and the ordinary Portland cement 32.5 is a construction material commonly used in China at present.
Experimental testing
In order to illustrate the efficacy of the soil stabilizer of the present invention, the soil stabilizers prepared in examples 1 to 3 and the soil stabilizer in comparative example 1 were soil stabilized, that is, the soil stabilizer and the soil were put into a machine according to a certain ratio and stirred uniformly to prepare a 40mm by 160mm test piece, the test piece was put into a standard curing box and cured to a corresponding age, the test piece was taken out and dried to perform a performance test, and the unconfined compressive strength of the reinforced soil was measured for 7 days, and the results are shown in table 1 below.
As can be seen from Table 1, the soil cured by the soil curing agent of the invention has good compressive strength in a short time at the initial stage, and the compressive strength of the soil is gradually increased along with the increase of the time; in terms of water absorption, the soil after solidification has low water absorption, the difference between the water absorption of 7 days and the water absorption of 28 days is not large, and the water stability is good.
The soil curing agent provided by the invention can increase the binding force, compactness and strength in soil, and simultaneously eliminate soil gaps, so that the soil has the characteristics of high early strength and water stability and long-term continuous increase; meanwhile, the surface tension of water can be effectively reduced by adding the surfactant. Compared with the traditional curing material, the bone ring has the advantages of high bone ring speed, high early and later strength, convenient construction, low cost and the like, and can be widely applied.
Example 4
The utility model provides a soil curing agent's compounding device, mixing barrel 1 including vertical setting, mixing barrel 1's top is equipped with into hopper 2, go into the dwang 3 that is equipped with the level setting in the hopper 2, dwang 3 can rotate around self axis, it has puddler 4 to distribute along length direction vertical distribution on the dwang 3, mixing barrel 1's top is the grid structure, mixing barrel 1 is inside to be equipped with the crushing roller 5 of two vertical settings side by side, mixing barrel 1's bottom evenly distributed has the discharge opening, mixing barrel 1's below is equipped with big end down and is mixing box 6 of round platform shape, be equipped with spray tube 7 along the circumferencial direction perpendicularly in proper order on mixing box 6's the slope lateral wall.
According to the mixing device, solid materials and liquid materials are added in different modes, so that the solid materials and the solid materials can be fully mixed, the uniformity is improved, meanwhile, the uniform dispersion of the liquid materials in the solid materials can be improved in a spraying mode, and the agglomeration is avoided. When the mixing device is used, firstly, all solid materials to be mixed are completely filled in a container, then all the solid materials are poured into the container from the material inlet hopper, the rotating rod is driven to rotate by the motor in the pouring process of the materials, so that the stirring rod is driven to move, the poured and downward moving materials are stirred and are dispersed in a beating mode in the moving process, therefore, the materials are subjected to a preliminary dispersing and mixing effect in the material inlet hopper, the materials uniformly penetrate through a grid structure at the top of the mixing cylinder after passing through the material inlet hopper, namely, the materials uniformly fall from the top of the mixing cylinder, then, in the falling process, the two crushing rollers rotate to roll, crush and disperse the materials, and the solid materials can be further dispersed and mixed; finally, the solid materials fall into the mixing box after being fully dispersed and mixed, and meanwhile, the liquid materials are sprayed in the falling materials in a liquid spraying mode from the spraying pipe, so that the mixing uniformity of the solid materials and the liquid materials is improved, and the quality of the curing agent is improved. The specific structure of the driving device for driving the rotating rod or the crushing roller can adopt the existing structure, and the specific structure of the spray pipe for spraying the liquid is also the prior art, so the detailed description is not provided herein.
The above-mentioned embodiments are intended to illustrate the objects, technical solutions and advantages of the present invention in further detail, and it should be understood that the above-mentioned embodiments are merely exemplary embodiments of the present invention, and are not intended to limit the scope of the present invention, and any modifications, equivalent substitutions, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (7)
1. A method for treating waste sludge, comprising the steps of: 1) taking out the sludge, and removing garbage impurities in the sludge by using a grid; 2) in the process of removing the garbage, building residue soil is added into the sludge layer by layer, namely the sludge layer and the building residue soil layer are paved at intervals, the standing is carried out for 1.5 to 2 hours, and then the mixture is stirred for 15 to 20 minutes and then is carried out for 30 minutes; 3) in the standing process, blowing the sludge by an air heater; 4) uniformly adding a soil curing agent into the sludge, and stirring at the speed of 60-70 r/min for 45-60 min; the soil curing agent comprises the following components in percentage by mass: 40-50 parts of Portland cement, 10-15 parts of quick lime, 30-40 parts of fly ash, 3-4 parts of short steel fiber, 6-8 parts of phosphate, 4-7 parts of ferrous sulfate, 10-12 parts of ethanol, 1-2 parts of a coagulant, 2-3 parts of a dispersant and 2-3 parts of a surfactant.
2. The method of claim 1, wherein the construction waste is crushed powder of a waste construction.
3. The method for treating waste sludge as claimed in claim 1, wherein the sludge layer and the construction sludge layer are laid at intervals with a thickness ratio of 3: 1.
4. The method for treating waste sludge according to claim 1, wherein the soil stabilizer comprises the following components in percentage by mass: 45 parts of Portland cement, 12 parts of quick lime, 35 parts of fly ash, 4 parts of short steel fiber, 8 parts of phosphate, 6 parts of ferrous sulfate, 12 parts of ethanol, 2 parts of a coagulant, 3 parts of a dispersing agent and 3 parts of a surfactant.
5. The method for treating waste sludge according to claim 1, wherein the method for adding the soil stabilizer comprises the steps of: 1) dividing the sludge into a plurality of square structures, drawing a circular annular cavity by taking the center of each square as the center of a circle, adding a soil curing agent into the annular cavity, and standing for 30 min; 2) and then stirring the sludge of each square in sequence, wherein the concrete steps comprise firstly stirring one square, then stirring the sludge of the second square after stirring the sludge of the first square, and repeating the steps until all the sludge is stirred for 1 hour.
6. The waste sludge treatment method according to claim 1, wherein the mixing device of the soil curing agent comprises a vertically arranged mixing barrel (1), an inlet hopper (2) is arranged above the top of the mixing barrel (1), a horizontally arranged rotating rod (3) is arranged in the inlet hopper (2), the rotating rod (3) can rotate around the axis of the rotating rod (3), stirring rods (4) are vertically distributed on the rotating rod (3) along the length direction, the top of the mixing barrel (1) is of a grid structure, two vertically arranged crushing rollers (5) are arranged in the mixing barrel (1) side by side, discharge holes are uniformly distributed at the bottom of the mixing barrel (1), a mixing box (6) which is in a circular table shape with a small upper part and a large lower part is arranged below the mixing barrel (1), and spray pipes (7) are sequentially and vertically arranged on the inclined side wall of the mixing box (6) along the circumferential direction.
7. A waste sludge treatment method as claimed in claim 6 wherein the outer wall of the stirring rod (4) is covered with a triangular protrusion, and the stirring rod (4) is made of rubber material.
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