CN115504628B - Filter material for sewage treatment and preparation method thereof - Google Patents
Filter material for sewage treatment and preparation method thereof Download PDFInfo
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- CN115504628B CN115504628B CN202211142013.3A CN202211142013A CN115504628B CN 115504628 B CN115504628 B CN 115504628B CN 202211142013 A CN202211142013 A CN 202211142013A CN 115504628 B CN115504628 B CN 115504628B
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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
- C02F9/00—Multistage treatment of water, waste water or sewage
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D39/00—Filtering material for liquid or gaseous fluids
- B01D39/14—Other self-supporting filtering material ; Other filtering material
- B01D39/20—Other self-supporting filtering material ; Other filtering material of inorganic material, e.g. asbestos paper, metallic filtering material of non-woven wires
- B01D39/2068—Other inorganic materials, e.g. ceramics
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D39/00—Filtering material for liquid or gaseous fluids
- B01D39/14—Other self-supporting filtering material ; Other filtering material
- B01D39/20—Other self-supporting filtering material ; Other filtering material of inorganic material, e.g. asbestos paper, metallic filtering material of non-woven wires
- B01D39/2068—Other inorganic materials, e.g. ceramics
- B01D39/2072—Other inorganic materials, e.g. ceramics the material being particulate or granular
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
- B01D53/84—Biological processes
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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
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/28—Anaerobic digestion processes
- C02F3/2806—Anaerobic processes using solid supports for microorganisms
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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
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/28—Anaerobic digestion processes
- C02F3/2846—Anaerobic digestion processes using upflow anaerobic sludge blanket [UASB] reactors
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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
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/32—Biological treatment of water, waste water, or sewage characterised by the animals or plants used, e.g. algae
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- 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
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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
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F2003/001—Biological treatment of water, waste water, or sewage using granular carriers or supports for the microorganisms
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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
- C02F2203/00—Apparatus and plants for the biological treatment of water, waste water or sewage
- C02F2203/006—Apparatus and plants for the biological treatment of water, waste water or sewage details of construction, e.g. specially adapted seals, modules, connections
Abstract
The application relates to the technical field of sewage treatment, in particular to a filter material for sewage treatment and a preparation method thereof. The filter material raw material is air-entrained building block waste crushed aggregates; the filter material has six grades of products, and can be used for sewage treatment Biological Aerated Filter (BAF), upflow anaerobic sludge reactor (UBF), denitrification filter, constructed wetland, biological deodorization and roof heat preservation. The waste crushed aggregates of the aerated building blocks comprise 40-60% of silicon dioxide, 20-30% of aluminum dioxide, 10-16% of ferric oxide, 5-20% of calcium oxide and 1-6% of magnesium oxide. The waste crushed aggregates of the aerated building blocks are crushed and graded, and the surface hardened product can be used as a filter material for water treatment, so that the aerated building blocks not only have the functions of adsorption and biological carriers of common filter materials, but also have the function of removing phosphate radical precipitation, thereby achieving the purposes of treating waste with waste, changing waste into valuable, and benefiting the national world and the people, and having great social and economic benefits.
Description
Technical Field
The application relates to the technical field of sewage treatment, in particular to a filter material for sewage treatment and a preparation method thereof.
Background
At present, common inorganic water treatment filter materials comprise quartz sand, ceramsite, zeolite and active carbon. The volcanic sand has better removal rate on SS, but has the characteristics of large density, small specific surface area, low porosity, faster head loss increase, large consumption of flushing water, general use in water production processes of drinking water works, spherical appearance of the ceramsite, rough surface, moderate density, high strength, abrasion resistance, large fixed biomass, quick film formation and the like, is widely used in sewage treatment, but needs high-temperature sintering in the production process, so that the energy consumption is high, zeolite has ion exchange performance, acid resistance and catalytic performance, but has relatively small pore diameter, easy blockage and large back flushing resistance, is generally used in nitrogen-containing sewage treatment, the activated carbon has adsorption effect on various pollutants, has good adsorption effect, has high cost, is generally used in the processes of drinking water treatment or sewage emergency treatment and the like, and the volcanic sand, the filter material, the activated carbon and the like can replace quartz sand, the filter medium, are natural minerals formed after volcanic explosion, are produced by mining price, but the state has been clearly prohibited from mining, and resource environment is protected.
The aerated building block is a lightweight porous fly ash building block produced by foaming, steaming and cutting fly ash of a power plant, and in the production process, cut leftover materials are often abandoned, so that not only is space occupied, but also resource waste is caused.
Disclosure of Invention
The application aims at solving at least one of the technical problems in the prior art, and therefore, one aspect of the application aims at providing a filter material for sewage treatment, wherein the raw material of the filter material is waste crushed aggregates of aerated building blocks; the filter material has six grades of products, and can be used for sewage treatment Biological Aerated Filter (BAF), upflow anaerobic sludge reactor (UBF), denitrification filter, constructed wetland, biological deodorization and roof heat preservation.
Preferably, the waste crushed aggregates of the aerated building blocks comprise 40-60% of silicon dioxide, 20-30% of aluminum dioxide, 10-16% of ferric oxide, 5-20% of calcium oxide and 1-6% of magnesium oxide. The waste aerated block crushed aggregates are formed by foaming and steaming fly ash, cement, lime and aluminum powder, have the advantages of rough surface, large specific surface area and high porosity, can be used as a biological carrier for water treatment, have the functions of filtering, adsorbing and the like, remove impurities in water, have higher strength after processed filter material particles are subjected to surface hardening, do not need the processes of steaming and pressing again and the like, are not easy to corrode, and can chemically react dissolved calcium, magnesium and iron ions with phosphate in water to generate phosphate precipitation, so that phosphorus in water is removed.
Another aspect of the present application is to provide a method for preparing a filter material for sewage treatment, which specifically includes the following steps:
s1, conveying raw materials into a primary jaw crusher through a belt conveyor to perform primary crushing to obtain crushed aggregates;
s2, screening the crushed materials which are primarily crushed in the S1 by using a round vibrating screen to obtain a first-grade material;
s3, feeding the primary material obtained in the step S2 into a double-roller crusher for crushing to obtain powder;
s4, screening the powder prepared in the step S3 by using a circular vibrating screen to obtain a secondary material;
s5, uniformly distributing the secondary material obtained in the step S4 through a wide belt feeder, and uniformly spraying the surface of the secondary material with a permeable liquid hardener to wet the surface of the secondary material;
s6, piling the secondary material wetted in the S5 into a material field for standing and curing reaction;
s7, conveying the secondary material subjected to the curing reaction in the S6 into a circular vibrating screen through a movable belt conveyor to obtain a tertiary material and primary, secondary and tertiary products, and packaging the primary, secondary and tertiary products respectively;
s8, feeding the third-level material in the S7 into a circular vibrating screen again to obtain fourth-level, fifth-level and sixth-level products, and packaging the fourth-level, fifth-level and sixth-level products respectively.
Preferably, the raw materials in the step S1 are air-entrained building block waste crushed aggregates, and the air-entrained building block waste crushed aggregates comprise 40-60% of silicon dioxide, 20-30% of aluminum dioxide, 10-16% of ferric oxide, 5-20% of calcium oxide and 1-6% of magnesium oxide.
Preferably, the primary material in the step S2 has a particle size smaller than millimeter and a particle size larger than 50 millimeter and returns to the primary jaw crusher of the step S1 to be primarily broken again.
Preferably, in the step S4, the mesh diameter of the circular vibrating screen is 1 mm, the particle size of the secondary material is 1-50 mm, and the powder with the particle size of 0-1 mm is too small to be used as a filter material, so that the powder can be sent back to an aerated block production factory for recycling raw materials or used as building light sand.
Preferably, the hardening agent in S5 includes 68% of sodium silicate, 1% of lithium silicate, 1% of glycerol and 30% of ionized water, and the hardening agent is diluted with water and sprayed, and the mass ratio of the hardening agent to the water is 1:4, a step of; the mass of the spraying dilution hardener for each ton of the secondary material is 0.3-0.5 kg.
Preferably, the curing reaction time in S6 is 4-12 hours.
Preferably, the circular vibrating screen in S7 has three layers, and the apertures are 30 mm, 20 mm and 10 mm respectively; the particle size of the third-level material is 1-10 mm, the particle size of the first-level product is 30-50 mm, the particle size of the second-level product is 20-30 mm, and the particle size of the third-level product is 10-20 mm.
Preferably, the circular vibrating screen in the step S8 is provided with two layers, and the apertures are 5 mm and 3 mm respectively; the grain size of the four-grade product is 5-10 mm, the grain size of the five-grade product is 3-5 mm, and the grain size of the six-grade product is 1-3 mm.
The application has the following beneficial effects:
the aerated block waste crushed aggregates used by the raw materials of the application have large specific surface area and rough surface. The porous rate is high, the adsorption performance is high, calcium ions, magnesium ions and iron ions which can be slowly released in water react with phosphate radical in water to generate precipitate, so that the waste crushed aggregates of the aerated building blocks are crushed and graded, and the surface hardening processing can be used as a filter material for water treatment, so that the porous ceramic filter material has the functions of adsorption and biological carrier of common filter materials and the function of removing phosphate radical precipitate, achieves the purposes of treating waste by waste, changing waste into valuable, and benefiting the nation and the people, and has great social and economic benefits.
The filter material prepared by the application has the advantages of rough surface, high porosity and adsorption function, and can adsorb pollutants such as COD, NH3-N, TP, SS and the like in water; the filter material has large specific surface area and high porosity, provides an attachment inhabitation place for microorganism attachment in water, is beneficial to the formation of microorganism floccules, is beneficial to the growth of biological films, has good retentivity for nutrients required by microorganisms, and is convenient for microorganism propagation and slow release; in terms of space volume and morphology, the surface area provided by the filter material is as large as possible, the corrosion of organisms to the filter material can be resisted, and the filter material does not participate in biochemical reaction in biological treatment.
The filter material is prepared by uniformly spraying the crushed material on the surface of the material by the permeable liquid hardener to moisten the surface of the material, and reacting with substances such as calcium, magnesium and the like in the material to form hard insoluble hydrated calcium silicate, so that the surface of the material is dust-free, each component is solidified into a solid, the strength of the material is improved by 40-50% after surface hardening treatment, and the wear resistance and the compression resistance of the material are improved, the material is not decolored after being immersed, has certain mechanical strength, chemical corrosion resistance and good thermodynamic stability.
The water treatment filter material prepared by the application has six grades of products, the particle size and the particle size range are adjustable and controllable, the adjustment of different gradations is carried out according to the requirements of different filter materials, and the operation is convenient and flexible.
The water treatment filter material prepared by the method is different from the existing preparation method of the water treatment filter material, does not need high-temperature sintering or steam steaming, and can be prepared into the water treatment filter material after crushing, screening, surface curing and grading treatment. The process is simple, the cost is low, the production process is pollution-free, dust-free, waste gas-free and waste water-free, and the secondary pollution to the environment is avoided.
Additional aspects and advantages of the application will become apparent in the following description or may be learned by practice of the application.
Detailed Description
In order that the above-recited objects, features and advantages of the application will be more clearly understood, a more particular description of the application will be rendered by reference to specific embodiments thereof. It should be noted that, without conflict, the embodiments of the present application and features in the embodiments may be combined with each other.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application, however, the present application may be practiced otherwise than as described, and therefore the scope of the present application is not limited to the specific embodiments disclosed below.
The device used in the application
Belt conveyor: the width of the belt is 600 mm, the conveying length is 10-20 m, the power is 2.2-4 kilowatts, the conveying speed is 1.25-2.0 m/s, and the conveying amount is 10-20 tons/hour.
Jaw crusher: PE250X450 type, the maximum grain size of the feed is 210 mm, the adjusting range of a discharge hole is 20-60 mm, the power is 15 kilowatts, and the treatment capacity is 5-20 tons per hour.
Roller crusher: 2PG-610X400 type, the maximum feeding grain diameter is less than 55 mm, the discharging grain diameter is 1-50 mm, the power is 30 kilowatts, and the treatment capacity is 13-50 tons per hour.
Hardening agent spray set: PE liquid storage tank takes agitating unit, and the reserve is 5 tons, and the shower nozzle is the PPR material, and 3 atomizer are connected.
Moving belt conveyor: the belt width is 600 mm, the length is 20 m, the power is 4 kw, the conveying speed is 1.25-2.0 m/s, and the conveying amount is 10-20 tons/h.
Round vibrating screen: 2YA1236 type, 3YA1536 type, one layer, two layers and three layers of sieve layers, wherein the sieve pore sizes are 1, 3, 5, 10, 20 and 30 mm respectively, the feeding particle size is less than 300 mm, the vibration times are 845 per second, the double amplitude is 8-11 mm, the power is 11-15 kilowatts, and the treatment capacity is 10-50 tons per hour.
Example 1
S1, conveying waste crushed aggregates of aerated building blocks into a primary jaw crusher through a belt conveyor for primary crushing to obtain crushed aggregates;
s2, screening the crushed aggregates which are primarily crushed in the S1 by using a round vibrating screen to obtain primary materials, wherein the primary materials have the particle size smaller than 50 mm and the crushed aggregates larger than 50 mm are returned to the primary jaw crusher of the S1 for primary crushing again;
s3, feeding the primary material obtained in the step S2 into a double-roller crusher for crushing to obtain powder;
s4, screening the powder prepared in the step S3 by using a circular vibrating screen to obtain a secondary material, wherein the aperture of the screen of the circular vibrating screen is 1 mm, the particle size of the secondary material is 1-50 mm, and the secondary material with the particle size of 0-1 mm is too small to be used as a filter material, so that the secondary material can be sent back to an aerated block production factory for recycling raw materials or used as building light sand;
s5, uniformly distributing the secondary material obtained in the S4 through a wide belt feeder, diluting a permeable liquid hardener (sodium silicate 68%, lithium silicate 1%, glycerol 1% and ionized water 30%) with water, and uniformly spraying the surface of the secondary material to wet the surface of the secondary material; the mass ratio of the hardener to the water is 1:4, a step of; the mass of the spraying dilution hardener for each ton of the secondary materials is 0.3-0.5 kg;
s6, piling the secondary material wetted in the S5 into a material field for standing and curing reaction for 4 hours;
s7, conveying the secondary material subjected to the curing reaction in the S6 into a circular vibrating screen through a movable belt conveyor, wherein the mesh of the circular vibrating screen is three layers, the aperture of the mesh of the circular vibrating screen is 30 mm, 20 mm and 10 mm respectively, so as to obtain a tertiary material, primary products, secondary products and tertiary products, wherein the particle size of the tertiary material is 1-10 mm, the particle size of the primary products is 30-50 mm, the particle size of the secondary products is 20-30 mm, the particle size of the tertiary products is 10-20 mm, and the primary products, the secondary products and the tertiary products are packaged respectively;
s8, the third-level materials in the S7 are sent into a circular vibrating screen again for screening, the number of the circular vibrating screen is two, the aperture of the circular vibrating screen is 5 mm and 3 mm respectively, four-level, five-level and six-level products are obtained, the particle size of the four-level products is 5-10 mm, the particle size of the five-level products is 3-5 mm, the particle size of the six-level products is 1-3 mm, and the four-level, five-level and six-level products are packaged respectively.
The six grades of products prepared in this example were used in a Biological Aerated Filter (BAF), an upflow anaerobic sludge reactor (UBF), a denitrification filter, an artificial wetland, a biological deodorization and roof insulation layer, and the bulk density was 640kg/m 3 The specific surface area is 15.5-27.5m 2 The compression strength per gram is 6.38Mpa, the porosity is 89 percent, the content of removed organic matters is 81 percent, the COD removal rate is 86 percent, the BOD removal rate is 87 percent, the dephosphorization rate is 85 percent, and the ammonia nitrogen removal rate is 85 percent.
Example two
S1, conveying waste crushed aggregates of aerated building blocks into a primary jaw crusher through a belt conveyor for primary crushing to obtain crushed aggregates;
s2, screening the crushed aggregates which are primarily crushed in the S1 by using a round vibrating screen to obtain primary materials, wherein the primary materials have the particle size smaller than 50 mm and the crushed aggregates larger than 50 mm are returned to the primary jaw crusher of the S1 for primary crushing again;
s3, feeding the primary material obtained in the step S2 into a double-roller crusher for crushing to obtain powder;
s4, screening the powder prepared in the step S3 by using a circular vibrating screen to obtain a secondary material, wherein the aperture of the screen of the circular vibrating screen is 1 mm, the particle size of the secondary material is 1-50 mm, and the secondary material with the particle size of 0-1 mm is too small to be used as a filter material, so that the secondary material can be sent back to an aerated block production factory for recycling raw materials or used as building light sand;
s5, uniformly distributing the secondary material obtained in the S4 through a wide belt feeder, diluting a permeable liquid hardener (sodium silicate 68%, lithium silicate 1%, glycerol 1% and ionized water 30%) with water, and uniformly spraying the surface of the secondary material to wet the surface of the secondary material; the mass ratio of the hardener to the water is 1:4, a step of; the mass of the spraying dilution hardener for each ton of the secondary materials is 0.3-0.5 kg;
s6, piling the secondary material wetted in the S5 into a material field for standing and curing reaction for 8 hours;
s7, conveying the secondary material subjected to the curing reaction in the S6 into a circular vibrating screen through a movable belt conveyor, wherein the mesh of the circular vibrating screen is three layers, the aperture of the mesh of the circular vibrating screen is 30 mm, 20 mm and 10 mm respectively, so as to obtain a tertiary material, primary products, secondary products and tertiary products, wherein the particle size of the tertiary material is 1-10 mm, the particle size of the primary products is 30-50 mm, the particle size of the secondary products is 20-30 mm, the particle size of the tertiary products is 10-20 mm, and the primary products, the secondary products and the tertiary products are packaged respectively;
s8, the third-level materials in the S7 are sent into a circular vibrating screen again for screening, the number of the circular vibrating screen is two, the aperture of the circular vibrating screen is 5 mm and 3 mm respectively, four-level, five-level and six-level products are obtained, the particle size of the four-level products is 5-10 mm, the particle size of the five-level products is 3-5 mm, the particle size of the six-level products is 1-3 mm, and the four-level, five-level and six-level products are packaged respectively.
The six grades of products prepared in this example were used in a Biological Aerated Filter (BAF), an upflow anaerobic sludge reactor (UBF), a denitrification filter, an artificial wetland, a biological deodorization and roof insulation layer, and the volume weight was 650kg/m 3 The specific surface area is 14.6-26.5m 2 /g, resistance toThe pressure strength is 6.18Mpa, the porosity is 78%, the content of removed organic matters is 83%, the COD removal rate is 85%, the BOD removal rate is 83%, the dephosphorization rate is 85%, and the ammonia nitrogen removal rate is 85%.
Example III
S1, conveying waste crushed aggregates of aerated building blocks into a primary jaw crusher through a belt conveyor for primary crushing to obtain crushed aggregates;
s2, screening the crushed aggregates which are primarily crushed in the S1 by using a round vibrating screen to obtain primary materials, wherein the primary materials have the particle size smaller than 50 mm and the crushed aggregates larger than 50 mm are returned to the primary jaw crusher of the S1 for primary crushing again;
s3, feeding the primary material obtained in the step S2 into a double-roller crusher for crushing to obtain powder;
s4, screening the powder prepared in the step S3 by using a circular vibrating screen to obtain a secondary material, wherein the aperture of the screen of the circular vibrating screen is 1 mm, the particle size of the secondary material is 1-50 mm, and the secondary material with the particle size of 0-1 mm is too small to be used as a filter material, so that the secondary material can be sent back to an aerated block production factory for recycling raw materials or used as building light sand;
s5, uniformly distributing the secondary material obtained in the S4 through a wide belt feeder, diluting a permeable liquid hardener (sodium silicate 68%, lithium silicate 1%, glycerol 1% and ionized water 30%) with water, and uniformly spraying the surface of the secondary material to wet the surface of the secondary material; the mass ratio of the hardener to the water is 1:4, a step of; the mass of the spraying dilution hardener for each ton of the secondary materials is 0.3-0.5 kg;
s6, piling the secondary material wetted in the S5 into a material field for standing and curing reaction for 12 hours;
s7, conveying the secondary material subjected to the curing reaction in the S6 into a circular vibrating screen through a movable belt conveyor, wherein the mesh of the circular vibrating screen is three layers, the aperture of the mesh of the circular vibrating screen is 30 mm, 20 mm and 10 mm respectively, so as to obtain a tertiary material, primary products, secondary products and tertiary products, wherein the particle size of the tertiary material is 1-10 mm, the particle size of the primary products is 30-50 mm, the particle size of the secondary products is 20-30 mm, the particle size of the tertiary products is 10-20 mm, and the primary products, the secondary products and the tertiary products are packaged respectively;
s8, the third-level materials in the S7 are sent into a circular vibrating screen again for screening, the number of the circular vibrating screen is two, the aperture of the circular vibrating screen is 5 mm and 3 mm respectively, four-level, five-level and six-level products are obtained, the particle size of the four-level products is 5-10 mm, the particle size of the five-level products is 3-5 mm, the particle size of the six-level products is 1-3 mm, and the four-level, five-level and six-level products are packaged respectively.
The six grades of products prepared in this example were used in a Biological Aerated Filter (BAF), an upflow anaerobic sludge reactor (UBF), a denitrification filter, an artificial wetland, a biological deodorization and roof insulation layer, and the volume weight was 650kg/m 3 The specific surface area is 15.5-27.5m 2 The compression strength per gram is 6.28Mpa, the porosity is 81 percent, the content of removed organic matters is 83 percent, the COD removal rate is 85 percent, the BOD removal rate is 85 percent, the dephosphorization rate is 85 percent, and the ammonia nitrogen removal rate is 85 percent.
The above description is only of the preferred embodiments of the present application and is not intended to limit the present application, but various modifications and variations will be apparent to those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the protection scope of the present application.
Claims (8)
1. A preparation method of a filter material for sewage treatment is characterized by comprising the following steps: the filter material raw material is air-entrained building block waste crushed aggregates; the filter material has six grades of products, and can be used for sewage treatment biological aerated filter, upflow anaerobic sludge reactor, denitrification filter, constructed wetland, biological deodorization and roof heat preservation;
the preparation method comprises the following specific steps:
s1, conveying raw materials into a primary jaw crusher through a belt conveyor to perform primary crushing to obtain crushed aggregates;
s2, screening the crushed materials which are primarily crushed in the S1 by using a round vibrating screen to obtain a first-grade material;
s3, feeding the primary material obtained in the step S2 into a double-roller crusher for crushing to obtain powder;
s4, screening the powder prepared in the step S3 by using a circular vibrating screen to obtain a secondary material;
s5, uniformly distributing the secondary material obtained in the step S4 through a wide belt feeder, and uniformly spraying the surface of the secondary material with a permeable liquid hardener to wet the surface of the secondary material;
s6, piling the secondary material wetted in the S5 into a material field for standing and curing reaction;
s7, conveying the secondary material subjected to the curing reaction in the S6 into a circular vibrating screen through a movable belt conveyor to obtain a tertiary material and primary, secondary and tertiary products, and packaging the primary, secondary and tertiary products respectively;
s8, feeding the third-level material in the S7 into a circular vibrating screen again to obtain fourth-level, fifth-level and sixth-level products, and packaging the fourth-level, fifth-level and sixth-level products respectively;
the hardening agent in S5 comprises 68% of sodium silicate, 1% of lithium silicate, 1% of glycerol and 30% of ionized water, the hardening agent is diluted by water and then sprayed, and the mass ratio of the hardening agent to the water is 1:4, a step of; the mass of the spraying dilution hardener for each ton of the secondary material is 0.3-0.5 kg.
2. The method for preparing the filter material for sewage treatment according to claim 1, wherein the method comprises the following steps: the waste crushed aggregates of the aerated building blocks comprise 40-60% of silicon dioxide, 20-30% of aluminum dioxide, 10-16% of ferric oxide, 5-20% of calcium oxide and 1-6% of magnesium oxide.
3. The method for preparing the filter material for sewage treatment according to claim 1, wherein the method comprises the following steps: the raw materials in S1 are waste air-entrained building blocks, and the waste air-entrained building blocks comprise 40-60% of silicon dioxide, 20-30% of aluminum dioxide, 10-16% of ferric oxide, 5-20% of calcium oxide and 1-6% of magnesium oxide.
4. The method for preparing the filter material for sewage treatment according to claim 1, wherein the method comprises the following steps: and in the step S2, the crushed aggregates with the particle size smaller than 50 mm and larger than 50 mm are returned to the primary jaw crusher of the step S1 for primary crushing again.
5. The method for preparing the filter material for sewage treatment according to claim 1, wherein the method comprises the following steps: and S4, the aperture of the screen mesh of the circular vibrating screen is 1 mm, and the particle size of the secondary material is 1-50 mm.
6. The method for preparing the filter material for sewage treatment according to claim 1, wherein the method comprises the following steps: and the curing reaction time in the step S6 is 4-12 hours.
7. The method for preparing the filter material for sewage treatment according to claim 1, wherein the method comprises the following steps: the screen mesh of the circular vibrating screen in the step S7 is three layers, and the apertures are 30 mm, 20 mm and 10 mm respectively; the particle size of the third-level material is 1-10 mm, the particle size of the first-level product is 30-50 mm, the particle size of the second-level product is 20-30 mm, and the particle size of the third-level product is 10-20 mm.
8. The method for preparing the filter material for sewage treatment according to claim 1, wherein the method comprises the following steps: the screen mesh of the circular vibrating screen in the step S8 is two layers, and the aperture is 5 mm and 3 mm respectively; the grain size of the four-grade product is 5-10 mm, the grain size of the five-grade product is 3-5 mm, and the grain size of the six-grade product is 1-3 mm.
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