CN117602859B - Sludge building material treatment system and treatment method - Google Patents

Sludge building material treatment system and treatment method Download PDF

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Publication number
CN117602859B
CN117602859B CN202311308250.7A CN202311308250A CN117602859B CN 117602859 B CN117602859 B CN 117602859B CN 202311308250 A CN202311308250 A CN 202311308250A CN 117602859 B CN117602859 B CN 117602859B
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sludge
building material
parts
zeolite
curing agent
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CN117602859A (en
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成铭钊
景镇子
郦怡
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Shanghai Haigu New Material Technology Co ltd
Jiangsu Jicui Functional Material Research Institute Co ltd
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Shanghai Haigu New Material Technology Co ltd
Jiangsu Jicui Functional Material Research Institute Co ltd
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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
    • C02F11/13—Treatment of sludge; Devices therefor by de-watering, drying or thickening by heating
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F11/00—Treatment of sludge; Devices therefor
    • C02F11/12—Treatment of sludge; Devices therefor by de-watering, drying or thickening
    • C02F11/14—Treatment of sludge; Devices therefor by de-watering, drying or thickening with addition of chemical agents
    • C02F11/148—Combined use of inorganic and organic substances, being added in the same treatment step
    • 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
    • C04B14/00—Use of inorganic materials as fillers, e.g. pigments, for mortars, concrete or artificial stone; Treatment of inorganic materials specially adapted to enhance their filling properties in mortars, concrete or artificial stone
    • C04B14/02—Granular materials, e.g. microballoons
    • C04B14/04—Silica-rich materials; Silicates
    • C04B14/047—Zeolites
    • 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
    • C04B18/00—Use of agglomerated or waste materials or refuse as fillers for mortars, concrete or artificial stone; Treatment of agglomerated or waste materials or refuse, specially adapted to enhance their filling properties in mortars, concrete or artificial stone
    • C04B18/04—Waste materials; Refuse
    • C04B18/0418—Wet materials, e.g. slurries
    • 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
    • C04B20/00—Use of materials as fillers for mortars, concrete or artificial stone according to more than one of groups C04B14/00 - C04B18/00 and characterised by shape or grain distribution; Treatment of materials according to more than one of the groups C04B14/00 - C04B18/00 specially adapted to enhance their filling properties in mortars, concrete or artificial stone; Expanding or defibrillating materials
    • C04B20/02—Treatment
    • 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
    • C04B20/00—Use of materials as fillers for mortars, concrete or artificial stone according to more than one of groups C04B14/00 - C04B18/00 and characterised by shape or grain distribution; Treatment of materials according to more than one of the groups C04B14/00 - C04B18/00 specially adapted to enhance their filling properties in mortars, concrete or artificial stone; Expanding or defibrillating materials
    • C04B20/02—Treatment
    • C04B20/023—Chemical treatment
    • 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
    • C04B20/00—Use of materials as fillers for mortars, concrete or artificial stone according to more than one of groups C04B14/00 - C04B18/00 and characterised by shape or grain distribution; Treatment of materials according to more than one of the groups C04B14/00 - C04B18/00 specially adapted to enhance their filling properties in mortars, concrete or artificial stone; Expanding or defibrillating materials
    • C04B20/02—Treatment
    • C04B20/04—Heat treatment
    • 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
    • C04B28/06—Aluminous cements
    • 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
    • C04B40/00—Processes, in general, for influencing or modifying the properties of mortars, concrete or artificial stone compositions, e.g. their setting or hardening ability
    • C04B40/02—Selection of the hardening environment
    • C04B40/0263—Hardening promoted by a rise in temperature
    • 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
    • C04B40/00—Processes, in general, for influencing or modifying the properties of mortars, concrete or artificial stone compositions, e.g. their setting or hardening ability
    • C04B40/02—Selection of the hardening environment
    • C04B40/0277—Hardening promoted by using additional water, e.g. by spraying water on the green concrete element
    • 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
    • C04B2111/00017—Aspects relating to the protection of the environment
    • 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
    • C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
    • C04B2201/50—Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Ceramic Engineering (AREA)
  • Organic Chemistry (AREA)
  • Structural Engineering (AREA)
  • Materials Engineering (AREA)
  • Environmental & Geological Engineering (AREA)
  • Hydrology & Water Resources (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Water Supply & Treatment (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Inorganic Chemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Civil Engineering (AREA)
  • Health & Medical Sciences (AREA)
  • Toxicology (AREA)
  • Thermal Sciences (AREA)
  • Physics & Mathematics (AREA)
  • Mechanical Engineering (AREA)
  • Treatment Of Sludge (AREA)

Abstract

The invention provides a sludge building material treatment system and a treatment method, and relates to the technical field of solid waste treatment; the sludge building material treatment system comprises a sludge drying unit and a sludge building material treatment unit; the sludge drying unit takes sludge and curing agent as raw materials to prepare dried sludge; the sludge building material unit takes the dried sludge, aggregate and additives as raw materials to prepare a building material product; the curing agent comprises the following components in parts by weight: 25-45 parts of polyacrylamide; 8-15 parts of bentonite; 9-15 parts of disodium ethylenediamine tetraacetate modified zeolite; 35-50 parts of cement; 3-5 parts of quicklime. According to the sludge building material treatment system, the sludge drying unit, the sludge building material unit and the self-made curing agent are organically combined, so that the treatment time of sludge building material is effectively shortened.

Description

Sludge building material treatment system and treatment method
Technical Field
The invention relates to the technical field of solid waste treatment, in particular to a sludge building material treatment system and a treatment method.
Background
With the acceleration of the urban process, the urban sewage treatment rate is improved year by year, and the sludge yield is increased sharply, so that the disposal of the sludge becomes an urgent environmental problem. In recent years, treatment and recycling of sludge have been increasingly emphasized. However, the sludge is difficult to treat as a waste with high water content, and the existing sludge treatment technology generally adopts a building material utilization mode, so that the sludge treatment technology has the advantages of large consumption, wide application scene and the like; but is limited by the problems of high water absorption rate, high plasticity, difficult shaping and the like of the sludge, and the problems still exist in practical application; in the building material application process, if sludge is not treated, the rear-end resource utilization cannot be performed. For example, in chinese patent CN100462325C, a sintering process for sludge bricks is proposed, the water content of the sludge is reduced by mixing the sludge with the dry powder, and the water content is reduced by aging, drying and other methods, so that the strength of the product is improved, and the problems of complex process flow, limited treatment efficiency and the like exist; in chinese patent CN114538873a, the PH of the sludge is adjusted first, and then the sludge is modified by high-temperature carbonization, so as to realize the recycling of the rear end, while being helpful for improving the adding amount of the sludge in the process of building material utilization, the energy consumption in the process is large, the disposal cost is high, the time of the disposal process is long, the disposal efficiency is low, and the purpose of efficiently disposing the sludge cannot be realized. There is therefore a great need for an efficient and economical way of disposal.
Disclosure of Invention
The invention aims to solve the technical problems that: in order to solve the problem of lower sludge building material treatment efficiency in the prior art, the invention provides a sludge building material treatment system, which effectively shortens the treatment time of sludge building material treatment and solves the problem of lower sludge building material treatment efficiency in the prior art by organically combining a sludge drying unit and a sludge building material unit.
The technical scheme adopted for solving the technical problems is as follows:
The sludge building material treatment system comprises a sludge drying unit and a sludge building material treatment unit;
The sludge drying unit takes sludge and curing agent as raw materials to prepare dried sludge;
The sludge building material unit takes the dried sludge, aggregate and additives as raw materials to prepare a building material product;
the curing agent comprises the following components in parts by weight:
optionally, the disodium edetate modified zeolite is prepared according to the following method:
s01: washing natural zeolite with deionized water, oven drying at 105deg.C, grinding, and sieving to obtain zeolite material;
S02: preparing disodium ethylenediamine tetraacetate solution, adding the zeolite material, and stirring at 75-85 ℃ for reaction for 3h; filtering, washing and drying at 105 ℃ to obtain the disodium edetate modified zeolite.
Optionally, the concentration of the disodium ethylenediamine tetraacetate solution is 0.2-0.4mol/L.
Optionally, the dosage ratio of the disodium edetate solution to the zeolite material in step S02 is 10-20mL:1g.
Optionally, the cement is a mixture of portland cement and high alumina cement.
Optionally, the weight ratio of the mixture of the silicate cement and the high alumina cement in the cement is (6-8): 1.
Optionally, the sludge drying unit comprises a heat exchanger, a mixing device, a paving device and an excavating device;
the outlet of the mixing equipment is connected with the paving equipment;
the excavating equipment is used for turning over the paved sludge;
the heat exchanger is used for conveying hot dry air to the paved sludge.
Optionally, the sludge building material unit comprises a raw material treatment section, a batching and stirring section, a forming device and a hydrothermal maintenance device which are sequentially connected; the hydrothermal maintenance device is connected with the heat exchanger.
Optionally, the device also comprises a tail gas treatment unit connected with the sludge drying unit.
Another object of the present invention is to provide a sludge building material treatment method, wherein the sludge building material treatment system is used for treating the sludge, and the method comprises the following steps:
s1: adding the sludge and a curing agent into a sludge drying unit, mixing to promote the solidification of the sludge and obtain dried sludge;
S2: and respectively adding the dried sludge, the aggregate and the additive into a sludge building material unit, and carrying out material mixing, stirring, digestion, crushing, forming and hydrothermal reaction to obtain a building material product.
The beneficial effects of the invention are as follows:
According to the sludge building material treatment system, the sludge drying unit, the sludge building material unit and the self-made curing agent are organically combined, so that the treatment time of sludge building material is effectively shortened; the curing agent integrally takes polyacrylamide as a large framework, cement compound and the like as fillers, and bentonite, modified zeolite and quicklime are used as auxiliary materials, so that the curing agent has excellent curing speed, curing strength and heavy metal stability, shortens the sludge curing time, improves the sludge curing efficiency, further improves the sludge building material treatment efficiency, and is beneficial to improving the structural stability and strength of the prepared sludge building material product.
Drawings
The invention will be further described with reference to the drawings and examples.
FIG. 1 is a schematic diagram of a sludge building material treatment system in the present invention;
FIG. 2 is a schematic flow chart of a sludge building material treatment system in the present invention.
In the figure: 1-a sludge drying unit; 11-a heat exchanger; 12-mixing equipment; 13-a paving apparatus; 14-excavating equipment; 2-a sludge building material unit; 21-a raw material treatment section; 211-a mud bin; 212-aggregate bin; 213-an additive bin; 214-a batching machine; 215-a crushing device; 216-a first dust removal device; 217-a second dust removal device; 22-a batching and stirring section; 221-stirring device; 222-a third dust removal device; 223-first-stage crushing equipment; 224-digestion unit; 225-a secondary crushing device; 226-an intermediate bin; 23-forming equipment; 24-a hydrothermal curing device; 3-an exhaust gas treatment unit; 31-a spraying device; 32-a centrifugal fan; 33-exhaust pipe.
Detailed Description
The present invention will now be described in further detail. The embodiments described below are exemplary and intended to illustrate the invention and should not be construed as limiting the invention, as all other embodiments, based on which a person of ordinary skill in the art would obtain without inventive faculty, are within the scope of the invention.
In order to solve the problem of lower sludge building material treatment efficiency in the prior art, the invention provides a sludge building material treatment system, which is shown in fig. 1 and comprises a sludge drying unit 1 and a sludge building material treatment unit 2; the sludge drying unit 1 takes sludge and a curing agent as raw materials, so that the sludge is cured to prepare dried sludge; the sludge building material unit 2 takes dried sludge, aggregate and additives as raw materials to prepare a building material product; the concrete shape of the building material product can be customized into pavement bricks, wall bricks, revetment retaining walls and the like according to the use requirement of the building material product.
In order to promote solidification of the sludge, the curing agent preferably comprises the following components in parts by weight:
The invention preferably uses the sludge with the water content of about 60% in the raw material of the sludge drying unit 1, and preferably uses the self-made curing agent as the curing agent; the self-made curing agent adopts polyacrylamide, bentonite, modified zeolite and quicklime as curing raw materials, and adopts a polyacrylamide high molecular structure as a large framework, so that the self-made curing agent has a good reinforcing effect and an excellent flocculation effect; the bentonite and the modified zeolite are porous structures, have excellent water absorption performance, can be adsorbed on a polyacrylamide framework, and further improve the curing strength; the quicklime has a pore structure, and has excellent binding property and impermeability when being used together with cement.
According to the sludge building material treatment system, the sludge drying unit, the sludge building material unit and the self-made curing agent are organically combined, so that the treatment time of sludge building material is effectively shortened, the sludge curing efficiency is improved, the sludge building material treatment efficiency is further improved, and meanwhile, the structural stability and strength of a prepared sludge building material product are improved.
At present, the commonly used sludge curing agent, such as cement-based curing agent, can lead to the dry shrinkage and cracking of the cured sludge after the silicate cement is hydrated, and can lead to the expansion and cracking after the aluminate cement is hydrated, so that the curing agent has no practical application value. In addition, at present, the sludge is difficult to completely solidify due to the problems of overhigh water content of waste sludge and uneven stirring caused by sludge agglomeration, and the strength after solidification is not high and has no use value; meanwhile, a large amount of heavy metals such as lead, chromium and the like exist in the sludge. Based on the problems, after the formula design of the curing agent is optimized, the curing agent provided by the invention can quickly react with moisture in sludge, shortens the curing period, has high strength after curing and forming, has excellent stability to heavy metals, can effectively solve the problems of low strength, easiness in shrinkage cracking and high content of heavy metals of the sludge after curing in the prior art, and has the advantage of high curing speed; the curing agent provided by the invention is convenient to use, low in cost and suitable for large-scale use.
In the self-made curing agent, the modified zeolite adopts disodium ethylenediamine tetraacetate to modify the natural zeolite. The disodium edetate has excellent complexing effect on heavy metals, and the zeolite has a porous structure and a larger specific surface area, thereby being beneficial to further enhancing the complexing effect on the heavy metals.
Specifically, the disodium ethylenediamine tetraacetate modified zeolite is prepared according to the following method:
S01: washing natural zeolite with deionized water, oven drying at 105deg.C, preferably for 6 hr, grinding, sieving with 30 mesh sieve, and retaining undersize to obtain zeolite material;
s02: preparing disodium ethylenediamine tetraacetate solution, adding zeolite material, and stirring at 75-85deg.C for reacting for 3 hr; filtering, washing zeolite with deionized water for 6 times, and drying at 105 ℃ in a drying oven to obtain disodium ethylenediamine tetraacetate modified zeolite.
The concentration of the disodium ethylenediamine tetraacetate solution is preferably 0.2-0.4mol/L.
Preferably, the dosage ratio of the disodium ethylenediamine tetraacetate solution to the zeolite material in the step S02 is 10-20mL:1g.
The cement is preferably a mixture of silicate cement and high alumina cement, and further preferably the mixture of silicate cement and high alumina cement in the cement has the weight ratio of (6-8): 1.
The self-made curing agent adopts the cement compound as a main curing material, is easy to popularize, bonds clay particles in the sludge by C-S-H gel generated by silicate cement hydration, and has a bracket effect by matching with the needle-shaped ettringite expansion effect generated by high-alumina cement hydration reaction. Firstly, the C-S-H gel network structure and the needle-shaped ettringite support structure can improve the sludge strength; secondly, the C-S-H gel network structure is easy to shrink and crack, while ettringite has an expansion effect, which is beneficial to maintaining the structural stability of the sludge; thirdly, water in the sludge is consumed in the hydration process of the high alumina cement, and the crystallization water is solidified, so that the strength is improved.
Furthermore, in order to achieve both the curing period and the curing strength of the dried sludge, the usage amount of the curing agent in the sludge drying unit 1 is preferably 10% -20% of the total weight of the sludge.
The particle size of polyacrylamide in the curing agent is preferably 200 mu m; the fineness of the zeolite is 400 meshes; the fineness of the bentonite is 400 meshes; the silicate cement is ordinary silicate cement.
In order to ensure that the performance of a building material product meets the use requirement of a building material, the invention preferably selects a sludge building material unit 2, which comprises 20-80 parts of dried sludge, 20-60 parts of aggregate and 1-20 parts of additive in parts by weight; and the concrete preference aggregate is selected from one or more of river sand, melon seed slices, broken stone, shale, slag and construction waste mixed according to any proportion; preferably, the additive is one or more selected from slaked lime, limestone, quicklime, dolomite and carbide slag.
Specifically, referring to fig. 1 and 2, a sludge drying unit 1 in the present invention includes a heat exchanger 11, a mixing device 12, a spreading device 13, and an excavating device 14; wherein the paving equipment 13 and the excavating equipment 14 are arranged in a storage yard workshop, and the outlet of the mixing equipment 12 is connected with the paving equipment 13; the excavating equipment 14 is used for turning over the spread sludge; the heat exchanger 11 is used for delivering hot dry air to the paving sludge.
Wherein the stirring device 12 can be any commercially available fixed or mobile drum mixer, double-shaft mixer, planetary mixer, etc. suitable for stirring slurry and dry powder; the paving apparatus 13 may be a conventional paving machine or the like having functions of paving, compacting, and leveling.
In the working process, after the sludge and the curing agent are uniformly mixed by the mixing equipment 12, the mixture is conveyed into the paving equipment 13 connected with the outlet of the mixing equipment, the paving equipment 13 uniformly paves the sludge discharged by the mixing equipment 12 on the ground of a storage yard workshop, and the excavating equipment 14 is used for periodically turning the sludge of the storage yard, so that the water in the sludge is fully contacted with hot dry air generated by the heat exchanger 11, the drying efficiency is improved, and the dried sludge is obtained.
The sludge building material unit 2 comprises a raw material treatment working section 21, a batching and stirring working section 22, a forming device 23 and a hydrothermal curing device 24 which are connected in sequence; in order to reduce the cost, the hydrothermal curing device 24 is further preferably connected with the heat exchanger 11 through a pipeline, so that waste heat steam generated by the hydrothermal curing device 24 is compressed and then is conveyed to the heat exchanger 11 in the sludge drying unit 1 through the pipeline, and heat energy in the waste heat steam can be recycled, so that sludge drying can be accelerated.
The raw material treatment section 21, the batching and stirring section 22, the forming equipment 23 and the hydrothermal curing device 24 in the invention can be selected according to the prior art; specifically, the preferred raw material treatment section 21 of the present invention comprises a mud bin 211, a bone bin 212, an additive bin 213, a batching machine 214, a crushing device 215, a first dust removal device 216 and a second dust removal device 217; wherein the outlets of the mud bin 211 and the aggregate bin 212 are connected with the inlet of the batching machine 214, the batching machine 214 is connected with the first dust removing device 216, and the outlet of the batching machine 214 is connected with the batching and stirring section 22; the outlet of the crushing device 215 is connected to the inlet of the additive bin 213 and the crushing device 215 is connected to the second dust removal device 217.
Wherein the batching machine 214 can select the existing 2-5-bucket commercial batching equipment according to different working conditions; the crushing device 215 may employ a jaw crusher in combination with a fine powder mill to achieve multi-stage crushing of the bulk additive.
Preferably, the batching and stirring section 22 comprises a stirring device 221, a third dust removing device 222, a first-stage crushing device 223, a digestion device 224, a second-stage crushing device 225 and an intermediate bin 226 which are connected with the stirring device 221, wherein the inlet of the stirring device 221 is respectively connected with the inlets of the batching machine 214 and the additive bin 213, the outlet of the stirring device 221 is connected with the inlet of the first-stage crushing device 223, the outlet of the first-stage crushing device 223 is connected with the inlet of the digestion device 224, the outlet of the digestion device 224 is connected with the inlet of the second-stage crushing device 225, and the outlet of the second-stage crushing device 225 is connected with the inlet of the intermediate bin 226.
The present invention preferably uses a bag type dust collector or an electric dust collector as the first dust collector 216, the second dust collector 217 and the third dust collector 222.
Based on the characteristic of high plasticity of the sludge, the primary crushing device 223 and the secondary crushing device 225 are preferably special crushing devices and have the same preferable structure; the primary and secondary pulverizing devices 223, 225 are shown in FIG. 4 of the patent application 201910857069.9.
Preferably, the inlet of the forming device 23 is connected with the outlet of the intermediate bin 226, the outlet of the forming device 23 is connected with the hydrothermal curing device 24, and waste heat steam discharged by the hydrothermal curing device 24 is compressed and then connected with the heat exchanger 11 in the sludge drying unit 1 through a pipeline.
According to the invention, the air inlets are preferably arranged on the hydrothermal curing device 24 at intervals of 20-50 cm, so that the excessive deviation of the product quality at different positions in the hydrothermal curing device 24 is prevented, the uniformity of air inlet and temperature in the hydrothermal curing device 24 is ensured, and the quality of building materials is ensured; meanwhile, a steam compression device is arranged at the air outlet of the hydrothermal curing device 24 so as to improve the pressure of waste heat steam, thereby improving the steam temperature, realizing the recovery of low-temperature steam latent heat and reducing the energy consumption of the whole production.
In order to reduce pollution, the sludge building material treatment system preferably further comprises a tail gas treatment unit 3 connected with the sludge drying unit 1, so that the tail gas generated by the sludge drying unit 1 is treated by the tail gas treatment unit 3 and then discharged.
Specifically, the preferred tail gas treatment unit 3 of the present invention comprises a spray device 31, a centrifugal fan 32 and an exhaust funnel 33 which are sequentially connected; the tail gas treatment unit 3 is connected with a storage yard of the sludge drying unit 1, waste gas which is generated by the sludge drying unit 1 and mainly contains VOC and ammonia which are easily soluble in water directly enters the spraying device 31 through a pipeline, the pressure is increased through the centrifugal fan 32, purified gas is conveyed, and then the treated qualified gas meeting the emission standard is discharged through the exhaust funnel 33.
According to the sludge building material treatment system provided by the invention, the water content of sludge is reduced by the sludge drying unit 1 through the dual actions of medicament consolidation and heat drying, the sludge building material unit 2 mixes the dried sludge with aggregate and additives, and the sludge building material is formed after digestion, aging and crushing, and then is subjected to hydrothermal maintenance to prepare a building material finished product; the waste heat steam generated by the hydrothermal curing device 24 is converted into hot dry air through the heat exchanger 11 and enters the sludge drying unit 1 to promote sludge drying; the waste gas generated by the sludge drying unit 1 is treated by the tail gas treatment unit 3 and is discharged after reaching the standard. The sludge building material treatment system provided by the invention is beneficial to realizing large-scale high-efficiency building material utilization of sludge, has the advantages of low energy consumption and no pollution, and can truly realize organic unification of social benefit, environmental benefit and economic benefit.
In conclusion, the sludge is similar to soil in nature and composition, mainly inorganic minerals, and has high utilization value. However, the sludge has complex components, high water content, high plasticity and poor engineering characteristics, and if the sludge is directly used as a building material product without pretreatment, the excessive sludge addition can seriously influence the quality of the building material, so that the sludge drying unit 1 reduces the water content of the sludge with higher efficiency and lower cost through the dual functions of medicament consolidation and heat drying; aiming at the problem of high plasticity of sludge, the invention improves the crushing equipment, designs a plurality of layers of crushing blades with different inclination angles, and the crushing blades with different inclination angles are staggered and rotated at high speed in all directions without dead angles when in use, thereby taking account of crushing and mixing of materials, ensuring full crushing of the materials, and simultaneously, the cavity bottom is not provided with a grate bottom, so that blocking is not easy to cause. In addition, the invention also designs a multistage crushing and stirring process, thereby further ensuring the full crushing of the sludge and the uniformity of the mixture. In order to improve the performance of the building material products, the invention optimizes the quantity and the positions of the hot steam inlets of the hydrothermal curing device 24, so that the products are heated more uniformly and react more fully. The invention also designs the waste heat recovery of the waste heat steam so as to fully utilize energy sources and reduce the energy consumption of the whole production. Waste heat steam from the hydrothermal curing device 24 is compressed, heated and subjected to heat exchange, then converted into dry hot air, and is introduced into a yard workshop of the sludge drying unit 1 to assist in improving drying efficiency, and waste gas uniformly enters the tail gas treatment unit 3 and is discharged after being qualified through spray washing treatment.
Another object of the present invention is to provide a sludge building material treatment method for treating a sludge by the sludge building material treatment system, comprising the steps of:
s1: adding sludge and a curing agent into the sludge drying unit 1, mixing, and promoting the solidification of the sludge to obtain dried sludge;
The method specifically comprises the steps that in a sludge drying unit 1, sludge with the water content of about 60% -90% is conveyed into a mixing device 12 through a metering pump, and a curing agent developed and designed in the invention is added according to the total amount of the sludge, wherein the adding amount of the curing agent is 10% -20% of the total weight of the sludge; after being uniformly stirred by the stirring equipment 12, the curing agent reacts with the moisture in the sludge; in a yard workshop, uniformly stirred sludge is paved on a yard site through paving equipment 13 connected with an outlet of mixing equipment 12, preferably, the thickness of the paved sludge is 20-30 cm, and then the paved sludge is circularly turned by adopting excavating equipment 14 according to the preset frequency of 5-6 hours; meanwhile, the heat exchanger 11 recovers the heat of waste heat steam generated by the sludge building material unit 2, converts the heat into hot dry air, and conveys the hot dry air to a storage yard so that the hot dry air contacts with the paved sludge, and the drying efficiency is improved; the hot dry air fully contacts with the spread sludge to become waste gas mainly comprising VOC and ammonia which are easy to dissolve in water, and the waste gas with sludge pollutants discharged from the storage yard space are conveyed to the tail gas treatment unit 3 together and are discharged after being treated; after 1-3 days, the sludge in the storage yard site can be reduced to 10-20% of water content, and the blocky dried bottom sludge with the particle size smaller than 50mm is collected by the excavating equipment 14 and then is uniformly conveyed into the sludge bin 211 of the sludge building material unit 2.
S2: respectively adding the dried sludge, the aggregate and the additive into a sludge building material unit 2, and preparing, stirring, digesting, crushing and forming to obtain a green body; the green body is directly or after stacking is conveyed to a hydrothermal curing device 24 for reaction, and a building material product is obtained; preferably, the curing temperature is 120-220 ℃ and the curing time is 3-24 hours.
The method specifically comprises the steps of starting a batching machine 214 connected with a mud bin 211 and an aggregate bin 212 to batching, wherein dried mud is stored in the mud bin 211, aggregate is stored in the aggregate bin 212, simultaneously starting a first dust removing device 216 connected with the batching machine 214, completing batching of the dried mud and the aggregate according to the formula amount, and simultaneously removing dust; in addition, the additive is added into the crushing device 215 according to the formula amount, and the second dust removing device 217 is started, the additive is crushed to the particle size of not more than 0.8mm by the crushing device 215 and then stored in the additive bin 213 for standby, wherein the second dust removing device 217 is used for removing dust generated when the additive is crushed.
Then, the dried sludge and aggregate in the batching machine 214 and the crushed additive from the additive bin 213 enter the stirring equipment 221 for stirring, and dust generated in the stirring process is removed by the third dust removing device 222; the mixture obtained after primary stirring and mixing by the stirring equipment 221 is sequentially conveyed to the primary crushing equipment 223, the digestion equipment 224 and the secondary crushing equipment 225, so that the particle size of the dried sludge, the particle size of the aggregate and the particle size of the additive are not more than 1mm after the dried sludge, the particle size of the aggregate and the particle size of the additive are crushed by the primary crushing equipment 223, the mixture is uniformly mixed, then digestion aging and secondary crushing are carried out, the materials are further cured, crushed and mixed, a building material mixture with the water content of 10-12% is obtained, and the building material mixture is conveyed and stored in the middle bin 226; the building material mixture stored in the intermediate bin 226 is further conveyed to the forming equipment 23, pressed into green bodies meeting the requirements of building material products under the static pressure of 5-40 MPa, and the green bodies are conveyed to the hydrothermal curing device 24 for reaction directly or after being piled, wherein the curing temperature is 120-220 ℃ and the curing time is 3-24 hours; and meanwhile, after the waste heat steam from the hydrothermal curing device 24 is compressed and heated, the waste heat steam enters the heat exchanger 11 in the sludge drying unit 1 for heat recovery, is converted into hot dry air, and is then conveyed to a storage yard workshop of the sludge drying unit 1.
In order to reduce pollution, the sludge building material treatment method provided by the invention further comprises the following step S3: tail gas treatment; specifically, the tail gas treatment step includes: the waste gas generated in a storage yard workshop of the sludge drying unit 1 is collected uniformly and is conveyed to a spraying device 31, after the temperature of the spraying device 31 is reduced, the odor is removed and the waste gas is adsorbed, the gas meeting the emission requirement is obtained, and the gas meeting the emission requirement is conveyed to an exhaust funnel 33 under the action of a centrifugal fan 32 and is discharged; meanwhile, the washing water is discharged after being qualified in treatment.
According to the invention, sludge from dredging is subjected to a series of procedures such as drying, building material treatment, tail gas treatment, waste heat utilization and the like, so that the sludge with high water content, complex components and poor engineering characteristics is subjected to reduction, harmless and resource utilization, waste is changed into valuable, and the organic unification of environmental benefit, economic benefit and social benefit is truly realized;
Compared with a sludge brickmaking process adopting a firing process, the sludge building material processing system fully utilizes the waste heat of steam, has the characteristics of low energy consumption, no pollution and high efficiency, can ensure that the building material processing process has higher cost performance even though the sludge content is high, and can prepare the sludge with high water content into a building material finished product only by 4 days.
According to the sludge building material treatment method, the sludge drying unit, the sludge building material unit and the self-made curing agent are organically combined, so that the treatment time of sludge building material is effectively shortened, the sludge curing efficiency is improved, the sludge building material treatment efficiency is further improved, and meanwhile, the structural stability and strength of a prepared sludge building material product are improved.
The sludge building material treatment method provided by the invention can produce high-quality pavement bricks, wall bricks, slope protection retaining walls and other products (the product performance accords with corresponding national standards or industry standards), further widens the rear end utilization of sludge products, provides a set of high-efficiency and low-energy treatment system for sludge treatment, and is beneficial to promoting sludge treatment.
In order that the above objects, features and advantages of the invention will be readily understood, a more particular description of the invention will be rendered by reference to specific embodiments thereof which are illustrated in the appended drawings.
Example 1
The embodiment provides a sludge building material treatment system, the structure of which is shown in fig. 1-2, and the specific treatment method is detailed above, and will not be described here again.
The curing agent in the step S1 comprises the following components in parts by weight:
the preparation method of the disodium ethylenediamine tetraacetate modified zeolite comprises the following steps:
S01: washing natural zeolite with deionized water, oven drying at 105deg.C for 6 hr, grinding, sieving with 30 mesh sieve, and retaining undersize to obtain zeolite material;
s02: preparing disodium ethylenediamine tetraacetate solution, adding zeolite material, and stirring on a magnetic stirrer at constant temperature of 80 ℃ for reaction for 3 hours; filtering, washing zeolite with deionized water for 6 times, and drying at 105 ℃ in a drying oven to obtain disodium ethylenediamine tetraacetate modified zeolite.
Wherein the concentration of the disodium ethylenediamine tetraacetate solution is 0.3mol/L;
The dosage ratio of the disodium ethylenediamine tetraacetate solution to the zeolite material was 15mL:1g;
The infrared data of the curing agent are as follows: 1048cm -1: -Si-O-Si-presence; 794cm -1: -Si-O-Si- (silicon oxygen tetrahedra); 724cm -1: -Al-O-Si- (aluminoxane octahedra) present; 1676cm -1: -c=o present; 3447cm -1: -OH is present; 909cm -1: carboxyl groups are present.
The sludge building material treatment process comprises the following steps:
s1: adding sludge and a curing agent into the sludge drying unit 1, mixing, and promoting the solidification of the sludge to obtain dried sludge;
S2: respectively adding the dried sludge, the aggregate and the additive into a sludge building material unit 2, and preparing, stirring, digesting, crushing and forming to obtain a green body; the green body is directly or after stacking is conveyed to a hydrothermal curing device 24 for reaction, and a building material product is obtained; preferably, the curing temperature is 170 ℃ and the curing time is 14 hours.
The amount of curing agent used in this example was 15% of the total weight of the sludge.
The raw materials in the step S2 of the embodiment comprise 50 parts of dried sludge, 40 parts of aggregate and 10 parts of additive in parts by weight; wherein the aggregate is river sand, and the additive is carbide slag.
Example 2
The difference between this example and example 1 is that the curing agent in step S1 comprises the following components in parts by weight:
the preparation method of the disodium ethylenediamine tetraacetate modified zeolite comprises the following steps:
S01: washing natural zeolite with deionized water, oven drying at 105deg.C for 6 hr, grinding, sieving with 30 mesh sieve, and retaining undersize to obtain zeolite material;
S02: preparing disodium ethylenediamine tetraacetate solution, adding zeolite material, and stirring on a magnetic stirrer at constant temperature of 85 ℃ for reaction for 3 hours; filtering, washing zeolite with deionized water for 6 times, and drying at 105 ℃ in a drying oven to obtain disodium ethylenediamine tetraacetate modified zeolite.
Wherein the concentration of the disodium ethylenediamine tetraacetate solution is 0.2mol/L;
the dosage ratio of the disodium ethylenediamine tetraacetate solution to the zeolite material was 20mL:1g;
The infrared data of the curing agent are as follows: 1048cm -1: -Si-O-Si-presence; 794cm -1: -Si-O-Si- (silicon oxygen tetrahedra); 724cm -1: -Al-O-Si- (aluminoxane octahedra) present; 1676cm -1: -c=o present; 3447cm -1: -OH is present; 909cm -1: carboxyl groups are present.
Example 3
The difference between this example and example 1 is that the curing agent in step S1 comprises the following components in parts by weight:
the preparation method of the disodium ethylenediamine tetraacetate modified zeolite comprises the following steps:
S01: washing natural zeolite with deionized water, oven drying at 105deg.C for 6 hr, grinding, sieving with 30 mesh sieve, and retaining undersize to obtain zeolite material;
S02: preparing disodium ethylenediamine tetraacetate solution, adding zeolite material, and stirring on a 75 ℃ constant temperature magnetic stirrer for reaction for 3 hours; filtering, washing zeolite with deionized water for 6 times, and drying at 105 ℃ in a drying oven to obtain disodium ethylenediamine tetraacetate modified zeolite.
Wherein the concentration of the disodium ethylenediamine tetraacetate solution is 0.4mol/L;
The infrared data of the curing agent are as follows: 1048cm -1: -Si-O-Si-presence; 794cm -1: -Si-O-Si- (silicon oxygen tetrahedra); 724cm -1: -Al-O-Si- (aluminoxane octahedra) present; 1676cm -1: -c=o present; 3447cm -1: -OH is present; 909cm -1: carboxyl groups are present.
The amount of curing agent used in this example was 20% of the total weight of the sludge.
Example 4
The difference between this example and example 1 is that the curing agent in step S1 comprises the following components in parts by weight:
the preparation method of the disodium ethylenediamine tetraacetate modified zeolite comprises the following steps:
S01: washing natural zeolite with deionized water, oven drying at 105deg.C for 6 hr, grinding, sieving with 30 mesh sieve, and retaining undersize to obtain zeolite material;
s02: preparing disodium ethylenediamine tetraacetate solution, adding zeolite material, and stirring on a magnetic stirrer at constant temperature of 80 ℃ for reaction for 3 hours; filtering, washing zeolite with deionized water for 6 times, and drying at 105 ℃ in a drying oven to obtain disodium ethylenediamine tetraacetate modified zeolite.
Wherein the concentration of the disodium ethylenediamine tetraacetate solution is 0.4mol/L;
the dosage ratio of the disodium ethylenediamine tetraacetate solution to the zeolite material was 10mL:1g;
The infrared data of the curing agent are as follows: 1048cm -1: -Si-O-Si-presence; 794cm -1: -Si-O-Si- (silicon oxygen tetrahedra); 724cm -1: -Al-O-Si- (aluminoxane octahedra) present; 1676cm -1: -c=o present; 3447cm -1: -OH is present; 909cm -1: carboxyl groups are present.
The amount of curing agent used in this example was 10% of the total weight of the sludge.
Example 5
The difference between this example and example 1 is that the curing agent in step S1 comprises the following components in parts by weight:
the preparation method of the disodium ethylenediamine tetraacetate modified zeolite comprises the following steps:
S01: washing natural zeolite with deionized water, oven drying at 105deg.C for 6 hr, grinding, sieving with 30 mesh sieve, and retaining undersize to obtain zeolite material;
s02: preparing disodium ethylenediamine tetraacetate solution, adding zeolite material, and stirring on a magnetic stirrer at constant temperature of 80 ℃ for reaction for 3 hours; filtering, washing zeolite with deionized water for 6 times, and drying at 105 ℃ in a drying oven to obtain disodium ethylenediamine tetraacetate modified zeolite.
Wherein the concentration of the disodium ethylenediamine tetraacetate solution is 0.3mol/L;
The dosage ratio of the disodium ethylenediamine tetraacetate solution to the zeolite material was 15mL:1g;
The infrared data of the curing agent are as follows: 1048cm -1: -Si-O-Si-presence; 794cm -1: -Si-O-Si- (silicon oxygen tetrahedra); 724cm -1: -Al-O-Si- (aluminoxane octahedra) present; 1676cm -1: -c=o present; 3447cm -1: -OH is present; 909cm -1: carboxyl groups are present.
The amount of curing agent used in this example was 15% of the total weight of the sludge.
Example 6
The difference between this example and example 1 is that the curing agent in step S1 comprises the following components in parts by weight:
the preparation method of the disodium ethylenediamine tetraacetate modified zeolite comprises the following steps:
S01: washing natural zeolite with deionized water, oven drying at 105deg.C for 6 hr, grinding, sieving with 30 mesh sieve, and retaining undersize to obtain zeolite material;
s02: preparing disodium ethylenediamine tetraacetate solution, adding zeolite material, and stirring on a magnetic stirrer at constant temperature of 80 ℃ for reaction for 3 hours; filtering, washing zeolite with deionized water for 6 times, and drying at 105 ℃ in a drying oven to obtain disodium ethylenediamine tetraacetate modified zeolite.
Wherein the concentration of the disodium ethylenediamine tetraacetate solution is 0.3mol/L;
The dosage ratio of the disodium ethylenediamine tetraacetate solution to the zeolite material was 15mL:1g;
The infrared data of the curing agent are as follows: 1048cm -1: -Si-O-Si-presence; 794cm -1: -Si-O-Si- (silicon oxygen tetrahedra); 724cm -1: -Al-O-Si- (aluminoxane octahedra) present; 1676cm -1: -c=o present; 3447cm -1: -OH is present; 909cm -1: carboxyl groups are present.
The curing agents of comparative examples 1-6 are all compared to example 1.
Comparative example 1
The difference between this comparative example and example 1 is that the curing agent in step S1 comprises the following components in parts by weight:
Comparative example 2
The difference between this comparative example and example 1 is that the curing agent in step S1 comprises the following components in parts by weight:
Comparative example 3
The difference between this comparative example and example 1 is that the curing agent in step S1 comprises the following components in parts by weight:
Comparative example 4
The difference between this comparative example and example 1 is that the curing agent in step S1 comprises the following components in parts by weight:
Comparative example 5
The difference between this comparative example and example 1 is that the curing agent in step S1 comprises the following components in parts by weight:
Comparative example 6
The difference between this comparative example and example 1 is that the curing agent in step S1 comprises the following components in parts by weight:
the performance test is carried out on the dried sludge prepared in each example and comparative example, and the test method is as follows:
(1) Appearance: visually, whether there was shrinkage cracking or expansion cracking occurred. If no said phenomenon is marked as OK; if the above phenomenon exists, the phenomenon is marked as NG.
(2) The water content is tested according to the GB 50123-2019 geotechnical test method. Initial water content of sludge: 88%.
(3) Heavy metal leaching test: the sludge solidified material is dried for 8 hours at 105 ℃, the water content is calculated, a sample of 5g of dry sludge is measured, and the sample is added into a beaker according to the water-solid ratio of 10g/L for neutral dissolution test. The heavy metal content of the supernatant was measured by ICP. Initial heavy metal content of sludge: pb:110.01mg/kg; cr:136.38mg/kg.
(4) The compressive strength of the building materials prepared in each example and comparative example was tested according to the GBT 2542-2012 wall block test method.
The test results are shown in Table 1:
TABLE 1
From the data in the table, the curing agent provided by each embodiment of the invention integrally uses polyacrylamide as a large framework, uses cement compound as a main filler, and is assisted by bentonite, modified zeolite and quicklime, so that the curing agent has excellent curing speed, curing strength and heavy metal stability. The cement compound is compounded by silicate cement and high alumina cement, the optimal ratio is 7/1, and the cement compound has important significance on the binding capacity, the curing speed and the curing strength of sludge particles after hydration reaction; bentonite and modified zeolite are porous structures, quicklime is porous structures, polyacrylamide is a hydrophilic polymer, and the bentonite, the modified zeolite and the quicklime adsorb the polyacrylamide, so that the bentonite and the modified zeolite have excellent water-fixing performance and certain heavy metal stability; after the zeolite is modified by disodium ethylenediamine tetraacetate, the zeolite has excellent metal complexing performance, the zeolite is attached to the porous structure, the performance is further improved, and the zeolite has excellent heavy metal stability.
In addition, as can be seen from the table, after the curing agent provided by the invention is used for curing the sludge, the leaching concentration values of the heavy metals of chromium and lead can meet the requirements of comprehensive wastewater discharge Standard (GB 8978-1996), and the fact that the heavy metal ions of chromium and lead in the sludge are basically stabilized after being cured is proved to be within an acceptable range for environmental risks.
With the above-described preferred embodiments according to the present invention as an illustration, the above-described descriptions can be used by persons skilled in the relevant art to make various changes and modifications without departing from the scope of the technical idea of the present invention. The technical scope of the present invention is not limited to the description, but must be determined according to the scope of claims.

Claims (8)

1. The sludge building material treatment system is characterized by comprising a sludge drying unit (1) and a sludge building material unit (2);
the sludge drying unit (1) takes sludge and curing agent as raw materials to prepare dried sludge;
The sludge building material unit (2) takes the dried sludge, aggregate and additives as raw materials to prepare a building material product;
the curing agent comprises the following components in parts by weight:
25-45 parts of polyacrylamide;
8-15 parts of bentonite;
9-15 parts of disodium ethylenediamine tetraacetate modified zeolite;
35-50 parts of cement;
3-5 parts of quicklime;
the disodium ethylenediamine tetraacetate modified zeolite is prepared according to the following method:
s01: washing natural zeolite with deionized water, oven drying at 105deg.C, grinding, and sieving to obtain zeolite material;
S02: preparing disodium ethylenediamine tetraacetate solution, adding the zeolite material, and stirring at 75-85 ℃ for reaction for 3h; filtering, flushing and drying at 105 ℃ to obtain disodium ethylenediamine tetraacetate modified zeolite;
the cement is a mixture of silicate cement and high-alumina cement.
2. The sludge treatment system of claim 1 wherein the disodium edetate solution has a concentration of 0.2 to 0.4 mol/L.
3. The sludge treatment system of claim 2 wherein the ratio of disodium edetate solution to zeolite material used in step S02 is 10-20mL:1g.
4. The sludge treatment system as claimed in claim 1, wherein the weight ratio of the mixture of the Portland cement and the high alumina cement in the cement is (6-8): 1.
5. The sludge building material treatment system as claimed in any one of claims 1 to 4, wherein the sludge drying unit (1) comprises a heat exchanger (11), a mixing device (12), a paving device (13) and an excavating device (14);
the outlet of the mixing equipment (12) is connected with the paving equipment (13);
the excavating equipment (14) is used for turning over the paved sludge;
The heat exchanger (11) is used for conveying hot dry air to the paved sludge.
6. The sludge building material treatment system as claimed in claim 5, wherein the sludge building material unit (2) comprises a raw material treatment section (21), a batching and stirring section (22), a forming device (23) and a hydrothermal curing device (24) which are connected in sequence; the hydrothermal maintenance device (24) is connected with the heat exchanger (11).
7. The sludge treatment system as claimed in any one of claims 1 to 4, further comprising a tail gas treatment unit (3) connected to the sludge drying unit (1).
8. A method for processing sludge into a building material, characterized by comprising the steps of:
s1: adding sludge and a curing agent into a sludge drying unit (1), mixing to promote solidification of the sludge and obtain dried sludge;
S2: and (3) respectively adding the dried sludge, the aggregate and the additive into a sludge building material unit (2), and carrying out material proportioning, stirring, digestion, crushing, forming and hydrothermal reaction to obtain a building material product.
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