CN116272645A - Sewage denitrification carrier preparation system and preparation method - Google Patents
Sewage denitrification carrier preparation system and preparation method Download PDFInfo
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- CN116272645A CN116272645A CN202310524752.7A CN202310524752A CN116272645A CN 116272645 A CN116272645 A CN 116272645A CN 202310524752 A CN202310524752 A CN 202310524752A CN 116272645 A CN116272645 A CN 116272645A
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- 238000002360 preparation method Methods 0.000 title claims abstract description 138
- 239000010865 sewage Substances 0.000 title claims abstract description 45
- 239000000463 material Substances 0.000 claims abstract description 206
- 239000007788 liquid Substances 0.000 claims abstract description 88
- 238000010438 heat treatment Methods 0.000 claims abstract description 68
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 claims abstract description 32
- 238000003756 stirring Methods 0.000 claims abstract description 21
- 238000000034 method Methods 0.000 claims abstract description 17
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- 238000002844 melting Methods 0.000 claims abstract description 5
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 63
- 238000004062 sedimentation Methods 0.000 claims description 26
- 239000000110 cooling liquid Substances 0.000 claims description 22
- 238000001035 drying Methods 0.000 claims description 22
- 238000005345 coagulation Methods 0.000 claims description 12
- 230000015271 coagulation Effects 0.000 claims description 12
- 238000011084 recovery Methods 0.000 claims description 12
- 239000000654 additive Substances 0.000 claims description 11
- 239000002245 particle Substances 0.000 claims description 11
- 230000000996 additive effect Effects 0.000 claims description 9
- 238000000227 grinding Methods 0.000 claims description 9
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- WCUXLLCKKVVCTQ-UHFFFAOYSA-M Potassium chloride Chemical compound [Cl-].[K+] WCUXLLCKKVVCTQ-UHFFFAOYSA-M 0.000 claims description 6
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 claims description 6
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 4
- 238000000465 moulding Methods 0.000 claims description 4
- IXPNQXFRVYWDDI-UHFFFAOYSA-N 1-methyl-2,4-dioxo-1,3-diazinane-5-carboximidamide Chemical compound CN1CC(C(N)=N)C(=O)NC1=O IXPNQXFRVYWDDI-UHFFFAOYSA-N 0.000 claims description 3
- 239000001103 potassium chloride Substances 0.000 claims description 3
- 239000011734 sodium Substances 0.000 claims description 3
- 235000010413 sodium alginate Nutrition 0.000 claims description 3
- 239000000661 sodium alginate Substances 0.000 claims description 3
- 229940005550 sodium alginate Drugs 0.000 claims description 3
- 239000011780 sodium chloride Substances 0.000 claims description 3
- 239000003795 chemical substances by application Substances 0.000 claims 1
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- 239000000969 carrier Substances 0.000 abstract description 6
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- 239000011593 sulfur Substances 0.000 description 21
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- 238000005054 agglomeration Methods 0.000 description 2
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- UXVMQQNJUSDDNG-UHFFFAOYSA-L Calcium chloride Chemical compound [Cl-].[Cl-].[Ca+2] UXVMQQNJUSDDNG-UHFFFAOYSA-L 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 229910000019 calcium carbonate Inorganic materials 0.000 description 1
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- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
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- 239000001095 magnesium carbonate Substances 0.000 description 1
- ZLNQQNXFFQJAID-UHFFFAOYSA-L magnesium carbonate Chemical compound [Mg+2].[O-]C([O-])=O ZLNQQNXFFQJAID-UHFFFAOYSA-L 0.000 description 1
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Images
Classifications
-
- 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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F27/00—Mixers with rotary stirring devices in fixed receptacles; Kneaders
- B01F27/80—Mixers with rotary stirring devices in fixed receptacles; Kneaders with stirrers rotating about a substantially vertical axis
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F33/00—Other mixers; Mixing plants; Combinations of mixers
- B01F33/80—Mixing plants; Combinations of mixers
- B01F33/836—Mixing plants; Combinations of mixers combining mixing with other treatments
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F33/00—Other mixers; Mixing plants; Combinations of mixers
- B01F33/80—Mixing plants; Combinations of mixers
- B01F33/836—Mixing plants; Combinations of mixers combining mixing with other treatments
- B01F33/8361—Mixing plants; Combinations of mixers combining mixing with other treatments with disintegrating
- B01F33/83613—Mixing plants; Combinations of mixers combining mixing with other treatments with disintegrating by grinding or milling
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F33/00—Other mixers; Mixing plants; Combinations of mixers
- B01F33/80—Mixing plants; Combinations of mixers
- B01F33/836—Mixing plants; Combinations of mixers combining mixing with other treatments
- B01F33/8364—Mixing plants; Combinations of mixers combining mixing with other treatments with drying
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F35/00—Accessories for mixers; Auxiliary operations or auxiliary devices; Parts or details of general application
- B01F35/90—Heating or cooling systems
- B01F35/92—Heating or cooling systems for heating the outside of the receptacle, e.g. heated jackets or burners
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F35/00—Accessories for mixers; Auxiliary operations or auxiliary devices; Parts or details of general application
- B01F35/90—Heating or cooling systems
- B01F35/93—Heating or cooling systems arranged inside the receptacle
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J2/00—Processes or devices for granulating materials, e.g. fertilisers in general; Rendering particulate materials free flowing in general, e.g. making them hydrophobic
- B01J2/02—Processes or devices for granulating materials, e.g. fertilisers in general; Rendering particulate materials free flowing in general, e.g. making them hydrophobic by dividing the liquid material into drops, e.g. by spraying, and solidifying the drops
- B01J2/06—Processes or devices for granulating materials, e.g. fertilisers in general; Rendering particulate materials free flowing in general, e.g. making them hydrophobic by dividing the liquid material into drops, e.g. by spraying, and solidifying the drops in a liquid medium
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F35/00—Accessories for mixers; Auxiliary operations or auxiliary devices; Parts or details of general application
- B01F35/90—Heating or cooling systems
- B01F2035/99—Heating
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W10/00—Technologies for wastewater treatment
- Y02W10/10—Biological treatment of water, waste water, or sewage
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- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Life Sciences & Earth Sciences (AREA)
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- Environmental & Geological Engineering (AREA)
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Abstract
The invention belongs to the technical field of sewage denitrification carriers, and discloses a sewage denitrification carrier preparation system and a sewage denitrification carrier preparation method, wherein the sewage denitrification carrier preparation system comprises the following steps: the material preparation reactor is provided with a feed inlet and a discharge outlet and is used for heating and melting and mixing materials; the distributor is connected with the discharge port to enable the mixed liquid to form liquid drops; a former for cooling the droplets into a shaped carrier; a controller; wherein, the material preparation reactor is also provided with a first heating sleeve, a built-in heater and a first stirrer; the first heating sleeve is positioned at the periphery of the cavity of the material preparation reactor; the built-in heater is positioned in the cavity; the first stirrer is inserted into the cavity of the material preparation reactor; the controller is in telecommunication connection with the first heating jacket, the built-in heater and the first stirrer. The system and the method heat the inside and the outside simultaneously and stir the materials, so that the problems of uneven heating, easy caking, uneven mixing and the like of the materials during melting can be solved; the method can adopt solid sulfur powder as raw material, has simple and convenient operation and flexible output regulation and control, and is suitable for the preparation requirement of medium and small scale carriers.
Description
Technical Field
The invention belongs to the technical field of sewage denitrification carriers, and particularly relates to a sewage denitrification carrier preparation system and a sewage denitrification carrier preparation method.
Background
The sulfur autotrophic denitrification generally adopts a solid material mainly comprising sulfur as a microbial carrier, and the carrier is used as an electron donor to participate in the autotrophic denitrification process, and the denitrification efficiency of the denitrification system is directly determined by the performance of the denitrification carrier.
The existing preparation method of the sulfur autotrophic denitrification carrier mainly comprises a wet underwater preparation method and a dry bonding preparation method. The carrier prepared by the wet underwater granulation method has the advantages of high uniformity of material components, high strength, uniform structure, less dust pollution in the preparation process and the like; the wet underwater granulation preparation process mainly adopts a sulfur underwater granulation system, and the working process comprises the following steps: firstly, introducing molten sulfur into a forming distributor, enabling the sulfur to flow out of the distributor in a state of a sulfur liquid bundle through small holes on the distributor, then entering a forming device filled with cooling water, forming spherical particles under the action of gravity and surface tension after the sulfur liquid bundle is cooled by water, settling and cooling the sulfur particles in forming equipment, depositing a certain amount at the bottom, discharging the sulfur particles, and removing water from the discharged particles through a dewatering screen to obtain a sulfur particle carrier.
The existing sewage denitrification carrier preparation device and system are mostly formed by improving and innovating the traditional sulfur production granulation system and device, and cannot well meet the preparation requirements of the existing sewage denitrification carrier. In order to better realize the sewage denitrification effect, other auxiliary materials such as inert powder mineral substances, magnesite, calcium carbonate, calcium chloride, diatomite, magnetic particles and the like are often added in the preparation of the sewage denitrification carrier besides the main sulfur material. The addition of various auxiliary materials can improve the performance of the denitrification carrier, but also brings new requirements to the preparation system and the preparation process of the denitrification carrier, for example, the auxiliary materials are easy to form caking when being mixed with liquid sulfur, are difficult to disperse, have the problem of uneven mixing and the like, and the small and medium sewage treatment plants have the problems of low demand on the denitrification carrier, high construction, transportation and storage costs and the like when adopting the existing production mode. Therefore, improvement and innovation of the existing sewage denitrification carrier preparation device and the existing sewage denitrification carrier preparation system are needed.
Disclosure of Invention
Aiming at the defects of the prior art, the invention aims to provide a sewage denitrification carrier preparation system and a preparation method, wherein the preparation system and the preparation method heat materials from the inside and the outside in a material preparation reactor simultaneously and stir the materials, so that the problems that the materials are heated unevenly, auxiliary materials are easy to agglomerate, mix unevenly and the like in the melting process can be solved; the method can directly adopt solid sulfur powder as a production raw material, is simple and convenient to operate, has flexible yield regulation and control, and is suitable for the preparation requirements of medium-small scale carriers.
In order to achieve the above purpose, the invention adopts the following technical scheme:
a sewage denitrification carrier preparation system, comprising:
the material preparation reactor is provided with a feed inlet and a discharge outlet and is used for heating and melting and mixing materials to form mixed liquid;
the distributor is connected with a discharge port of the material preparation reactor and is used for enabling the mixed liquid to form liquid drops;
the former is positioned below the distributor, is internally provided with cooling liquid and is used for cooling the liquid drops into a forming carrier; and
A controller;
wherein, the material preparation reactor is also provided with a first heating sleeve, a built-in heater and a first stirrer;
the first heating sleeve is positioned at the periphery of the cavity of the material preparation reactor and is used for heating materials in the cavity from outside to inside;
the built-in heater is positioned in the cavity and used for heating materials from the inside of the cavity;
the stirring paddles of the first stirrer are inserted into the cavity of the material preparation reactor from top to bottom and are used for stirring materials;
the controller is in telecommunication connection with the first heating jacket, the built-in heater and the first stirrer.
In one embodiment of the present application, the distributor is provided with a second heating jacket;
and/or a flow regulating valve is arranged between the distributor and the discharge port;
the second heating jacket and the flow regulating valve are in telecommunication connection with the controller.
In one embodiment of the present application, the cavity of the material preparation reactor comprises a first zone located at the upper part, and a second zone, a third zone and a fourth zone located at the lower part;
the third area and the fourth area are positioned at two sides of the second area and are respectively separated from the second area and the first area through baffles;
the upper side of the third zone is provided with a first inlet communicated with the first zone, and the discharge port is arranged in the third zone;
the lower part of the side surface of the fourth zone is provided with a second inlet communicated with the second zone, and the fourth zone is also provided with a first outlet connected to the outside of the cavity of the material preparation reactor;
and/or a liquid level monitor is arranged in the cavity of the material preparation reactor, and the liquid level monitor is in telecommunication connection with the controller.
In one embodiment of the present application, the preparation system further comprises a bed charge collector, a drying device, a grinding device and a batching box, which are sequentially arranged;
the bottom material collector is connected with the first outlet through a first pipeline, a bottom material draining valve is arranged on the first pipeline, and the bottom material draining valve is in telecommunication connection with the controller;
the batching box is connected with the feed inlet and is used for providing configured materials for the material preparation reactor.
In one embodiment of the present application, the preparation system further includes a constant temperature water tank, a water inlet of the constant temperature water tank is connected with a water outlet of the former through a second pipeline, and a water outlet of the constant temperature water tank is connected with a water inlet of the former through a third pipeline;
and the second pipeline is provided with a circulating water pump, and the circulating water pump and the constant-temperature water tank are in telecommunication connection with the controller.
In one embodiment of the present application, further comprising a screen and a water recovery device;
the screening device is connected with the second outlet of the former and is used for separating the forming carrier and the cooling liquid discharged by the former;
the water recovery device comprises a pre-sedimentation tank, a coagulation tank and a post-sedimentation tank which are sequentially arranged;
the pre-sedimentation tank is connected with the screening device and the drying device;
the coagulation tank is provided with a second stirrer and a medicament adding device, and the second stirrer and the medicament adding device are in telecommunication connection with the controller;
and a clear water outlet of the rear sedimentation tank is connected to the constant temperature water tank.
A method for preparing a sewage denitrification carrier, which comprises the following steps:
s1, preparing materials, and adding the materials into a material preparation reactor;
s2, heating materials from the periphery and the inside of the material preparation reactor simultaneously;
step S3, after the materials are heated to a first preset temperature and/or a first preset time period, stirring the materials to enable the materials to be melted and mixed into mixed liquid;
s4, preheating a distributor, introducing the mixed liquid after the distributor is preheated to a second preset temperature and/or a second preset time period, and continuously heating the distributor at a controlled temperature to enable the mixed liquid to be distributed into liquid drops through the distributor;
and S5, dripping the liquid drops into cooling liquid to be cooled into a molding carrier.
In one embodiment of the present application, further comprising:
s6, stopping introducing the mixed liquid into the distributor when the residual amount of the mixed liquid in the material preparation reactor is less than 5% -25% of the initial amount, and collecting, drying and grinding the residual mixed liquid to obtain a recovered bottom material;
and S7, using the recovered primer in the preparation material in the step S1.
In one embodiment of the present application, the materials include sulfur powder, alkalinity donor material and additives:
the alkalinity donor material comprises CaCO 3 、MgCO 3 、Na 2 CO 3 、FeCO 3 The particle size of the alkalinity donor is 2-500 mu m;
and/or the additive comprises Fe 3 O 4 、Fe 2 O 3 、FeS 2 、CaCl 2 One or more of NaCl, KCl, sodium alginate and diatomite, wherein the particle size of the additive is 0.1-500 mu m;
and/or the mass ratio of the alkalinity donor material and the additive is not more than 35% of the total mass of the material.
In one embodiment of the present application, the first preset temperature is 115-185 ℃, and the first preset time period is 10-200 min;
and/or the second preset temperature is 110-180 ℃, the second preset time is 10-60 min, and the temperature of the distributor for continuous temperature control and heating is 105-160 ℃;
and/or the temperature of the cooling liquid is 15-65 ℃.
Compared with the prior art, the invention has the beneficial effects that:
1. compared with a large-scale preparation system which adopts liquid sulfur as a main raw material, the preparation system and the preparation method have lower cost in equipment investment, raw material transportation and storage, simple and convenient preparation process operation and flexible yield regulation and control, and can better meet the carrier preparation requirements of medium and small scale; simultaneously, the materials are heated simultaneously in the preparation reactor and the outside, and the first stirrer is arranged, so that the problems of uneven heating, easy agglomeration, uneven material mixing and the like in the melting process which are easy to occur when sulfur powder is taken as a main raw material and a large amount of auxiliary materials are added to produce a denitrification carrier can be effectively solved;
2. in the preparation process of the sewage denitrification carrier, after the sulfur powder and the auxiliary materials are mixed and melted in a preparation reactor to form a liquid mixture, layering is easily formed in the vertical direction of the sulfur liquid due to the specific gravity difference and the surface tension influence of various materials, namely, the added materials with higher specific gravity have higher bottom content and the added materials with lower specific gravity have higher upper layer content, so that when liquid sulfur with different depths enters a distributor, components are different, the stability of the forming process and the product quality can be influenced, the adding amount of the auxiliary materials is limited in the existing preparation process, and the adding amount of the auxiliary materials is relatively smaller; the first zone (mixing zone), the second zone (bottom material zone), the third zone (discharging zone) and the fourth zone (bottom material discharging zone) and the liquid level monitor and the like are arranged in the material preparation reactor, so that materials used for finally preparing the carrier come from the first zone (mixing zone) which is more uniformly mixed in the material preparation reactor; therefore, the system and the method can better ensure the stability of the product quality, realize the addition of auxiliary materials with higher proportion and are beneficial to improving the denitrification performance of the prepared carrier;
3. the temperature is a main influencing factor in the forming process of the denitrification carrier taking sulfur as a main raw material, the fluidization of mixed liquid in a material preparation reactor and the fluidization of liquid drops in forming distribution are influenced by the too low or the too high temperature, and meanwhile, the temperature of cooling water in a former has an important influence on the carrier forming structure and strength; according to the method, the first heating sleeve, the built-in heater, the second heating sleeve, the constant-temperature water tank and the like are arranged to be connected with the controller, so that the temperature of each link can be independently and accurately controlled, the fluidization of the drop of the distributor and the forming size and strength of the carrier in the former can be better adjusted, and the carrier forming effect and yield can be effectively improved;
4. the utility model provides a setting up bed charge collector, drying device, grinder and water recovery unit etc. can handle and cyclic utilization to bed charge, waste material, the waste water that produces in the preparation process, can effectively improve the utilization efficiency of raw and other materials and water, reduces the cost of preparation of carrier.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present application, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of a sewage denitrification carrier preparation system in the present application.
FIG. 2 is a schematic diagram of the structure of the material making reactor and distributor in the present application.
Fig. 3 is a schematic view of the structure of the built-in heater in the present application.
Fig. 4 is a schematic plan view of the built-in heater in the present application.
Reference numerals:
1. a material preparation reactor; 101. a first zone; 102. a second zone; 103. a third zone; 1031. a first inlet; 104. a fourth zone; 1041. a second inlet; 1042. a first outlet; 11. a feed inlet; 12. a discharge port; 13. a first heating jacket; 14. a built-in heater; 15. a first agitator; 16. a liquid level monitor;
2. a distributor; 21. a second heating jacket; 22. a flow regulating valve;
3. a former; 31. a second outlet;
4. a controller;
5. a bed charge collector; 50. a first pipeline; 501. a bottom material emptying valve; 51. a drying device; 52. a grinding device;
6. a batching box;
7. a constant temperature water tank; 71. a second pipeline; 711. a circulating water pump; 72. a third pipeline;
8. a sifter;
9. a water recovery device; 91. a pre-sedimentation tank; 92. a coagulation pool; 921. a second stirrer; 922. a medicament adding device; 93. and (5) a rear sedimentation tank.
Detailed Description
Hereinafter, only certain exemplary embodiments are briefly described. As will be recognized by those of skill in the pertinent art, the described embodiments may be modified in various different ways without departing from the spirit or scope of the present invention. Accordingly, the drawings and description are to be regarded as illustrative in nature and not as restrictive.
In the description of the present invention, it should be understood that the terms "upper", "lower", "front", "rear", "vertical", "bottom", "inner", "outer", "peripheral", etc. indicate orientations or positional relationships based on those shown in the drawings, or orientations or positional relationships conventionally put in use of the product of the present invention, or orientations or positional relationships conventionally understood by those skilled in the art, are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present invention.
The terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present invention, the meaning of "a plurality" is two or more, unless explicitly defined otherwise.
In the present invention, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and the like are to be construed broadly and include, for example, either fixedly attached, detachably attached, or integrally formed; the device can be mechanically connected, electrically connected and communicated; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.
In the present invention, unless expressly stated or limited otherwise, a first feature "above" or "below" a second feature may include both the first and second features being in direct contact, as well as the first and second features not being in direct contact but being in contact with each other through additional features therebetween. Moreover, a first feature being "above," "over" and "on" a second feature includes the first feature being directly above and obliquely above the second feature, or simply indicating that the first feature is higher in level than the second feature. The first feature being "under", "below" and "beneath" the second feature includes the first feature being directly under and obliquely below the second feature, or simply means that the first feature is less level than the second feature.
The following disclosure provides many different embodiments, or examples, for implementing different features of the invention. In order to simplify the present disclosure, components and arrangements of specific examples are described below. They are, of course, merely examples and are not intended to limit the invention.
Embodiments of the present invention will be described in detail below with reference to the accompanying drawings.
Example 1
As shown in fig. 1 to 4, an embodiment of the present invention provides a sewage denitrification carrier preparation system suitable for preparing a sulfur autotrophic denitrification carrier. The sewage denitrification carrier preparation system comprises a material preparation reactor 1, a distributor 2, a shaper 3 and a controller 4 for regulation and control which are sequentially arranged.
The upper part of the material preparation reactor 1 is provided with a feed inlet 11, the lower part is provided with a discharge outlet 12, and the material preparation reactor 1 is used for heating and melting materials and fully mixing the materials to finally form mixed liquid.
The distributor 2 can be arranged below the material preparation reactor 1 and connected with a discharge hole 12 of the material preparation reactor 1, and is used for enabling the mixed liquid prepared in the material preparation reactor 1 to drop to form dispersed liquid drops.
And the forming device 3 is arranged below the distributor 2, cooling liquid is filled in the forming device 3, and liquid drops dropped by the distributor 2 enter the forming device 3 and are cooled into a forming carrier in the forming device 3 through the cooling liquid.
Wherein, the material preparation reactor 1 is also provided with a first heating sleeve 13, a built-in heater 14 and a first stirrer 15. The first heating sleeve 13 is arranged on the shell of the material preparation reactor 1 and is positioned at the periphery of the cavity of the material preparation reactor 1 and used for heating materials in the cavity of the material preparation reactor 1 from outside to inside; the first heating jacket 13 may be heated by a heating medium (such as heating oil) or electrically heated. The built-in heater 14 is located inside the cavity of the material making reactor 1 for heating the material from inside the cavity. The motor of the first stirrer 15 is positioned above the material preparation reactor 1, and the stirring paddles of the first stirrer are inserted into the cavity of the material preparation reactor 1 from top to bottom and are used for stirring and mixing materials in the cavity.
The controller 4 is in telecommunication connection with the first heating jacket 13, the built-in heater 14 and the first stirrer 15 for controlling the heating temperature and heating time of the first heating jacket 13, the built-in heater 14, etc., and controlling the stirring speed and stirring time of the first stirrer 15, etc. The controller 4 may be one or more.
The material preparation reactor 1 is provided with the first heating sleeve 13 and the built-in heater 14, and the material is heated simultaneously inside and outside the material preparation reactor, and the first stirrer 15 is arranged, so that the problems that the melting process is heated unevenly, caking is easy, the material mixing is uneven and the like easily occur when sulfur powder is taken as a main raw material and a large amount of auxiliary materials are added to produce a denitrification carrier can be effectively solved; and the system can directly adopt solid sulfur powder as a main production raw material, and compared with a large-scale preparation system adopting liquid sulfur as the main raw material, the preparation system has lower cost in equipment investment, raw material transportation and storage, simple and convenient preparation process operation and flexible output regulation and control, and can be better suitable for the preparation requirements of medium and small-scale carriers.
As shown in fig. 2, in a further embodiment, a second heating jacket 21 is provided outside the distributor 2, and the second heating jacket 21 is in telecommunication connection with the controller 4, and may be in the form of heating medium (heating oil) heating or electric heating, and the heating temperature, heating time and the like of the second heating jacket are controlled by the controller 4. The inlet end of the distributor 2 is connected with the discharge port 12 of the material preparation reactor 1, a flow regulating valve 22 is arranged between the distributor 2 and the discharge port 12, the flow regulating valve 22 is in telecommunication connection with the controller 4, and the opening, closing and flow of the flow regulating valve 22 are controlled by the controller 4. The second heating jacket 21 and the flow regulating valve 22 are arranged, so that the temperature and the flow rate of the mixed liquid in preparing liquid drops can be better controlled, and the required carrier with stable quality can be obtained.
As shown in fig. 2, in one embodiment, the cavity of the batch reactor 1 is divided into a plurality of regions, including a first region 101 at the upper part and a second region 102, a third region 103 and a fourth region 104 at the lower part; wherein the first zone 101 and the second zone 102 are in up-down communication; the third zone 103 and the fourth zone 104 are located on both sides of the second zone 102, i.e. on both sides of the lower part of the production reactor 1, and are separated from the second zone 102 and the first zone 101 by baffles, respectively. The upper baffle of the third zone 103 is provided with a first inlet 1031 communicated with the first zone 101; the discharge opening 12 of the production reactor 1 is arranged at this third zone 103 for connection from the third zone 103 to the distributor 2. A second inlet 1041 is arranged at the lower part of the side baffle of the fourth zone 104 and is communicated with the second zone 102; and a first outlet 1042 connected to the outside of the cavity of the material making reactor 1 is provided at the fourth zone 104 for discharging the material outwards. I.e. the first zone 101 is the main mixing zone, the second zone 102 is the bed charge zone, the third zone 103 is the discharge zone, and the fourth zone 104 is the bed charge discharge zone.
As shown in fig. 2, 3 and 4, the built-in heater 14 may be a heating rod assembly comprising a plurality of vertically dispersed heating rods; when the internal heater 14 is used, it is preferably located in the first zone 101 of the material making reactor 1, and the material is heated in the first zone 101. Further, the built-in heater 14 may be provided in a movable structure, and may be taken out of or put into the cavity of the material making reactor 1 as needed. The paddles of the first agitator 15 are preferably located in the first and second sections 101, 102 and agitate the material in the first and second sections 101, 102 simultaneously. The stirring paddles of the first stirrer 15 are arranged to avoid the built-in heater 14, so that the built-in heater 14 is not damaged during stirring; alternatively, the first pulsator 15 is used separately from the built-in heater 14.
A liquid level monitor 16 is arranged in the cavity of the material preparation reactor 1, and the liquid level monitor 16 is in telecommunication connection with the controller 4 and is used for monitoring real-time liquid level information of mixed liquid in the material preparation reactor 1.
In a further embodiment, as shown in fig. 1, the sewage denitrification carrier preparation system further comprises a bottom material collector 5, a drying device 51, a grinding device 52, a batching box 6 and the like which are sequentially arranged. The bottom material collector 5 is connected with a first outlet 1042 arranged at the fourth zone 104 through a first pipeline 50 and is used for collecting the bottom materials remained after the material is prepared in the material preparation reactor 1; the first pipeline 50 is provided with a bottom material draining valve 501, and the bottom material draining valve 501 is in telecommunication connection with a controller and is used for controlling the opening or closing of the first pipeline 50; the bottom discharge valve 501 is associated with a level monitor 16, which normally controls the opening or closing of the bottom discharge valve 501 depending on the level change in the production reactor 1. The materials are collected in a bottom material collector 5, solidified, sent into a drying device 51 for drying, ground by a grinding device 52 after being dried, recycled after being ground, and sent into a batching box 6 to participate in the preparation of initial materials. The drying device 51 may adopt an air flow drying mode, an infrared drying mode, a microwave drying mode, a fluidized bed drying mode and the like. The batching box 6 is used for preparing and mixing initial materials, and is connected with a feed inlet 11 of the material preparing reactor 1 to provide prepared materials for the material preparing reactor 1.
In a further embodiment, the sewage denitrification carrier preparation system further comprises a constant temperature water tank 7, wherein a water inlet of the constant temperature water tank 7 is connected with a water outlet of the former 3 through a second pipeline 71, and a water outlet of the constant temperature water tank 7 is connected with a water inlet of the former 3 through a third pipeline 72; the second pipeline 71 is provided with a circulating water pump 711, and the circulating water pump 711 and the constant temperature water tank 7 are in telecommunication connection with the controller 4. The constant temperature water tank 7 is arranged for providing the cooling liquid with proper and stable temperature for the former 3, and further ensures the strength and the structural stability of carrier molding.
As shown in FIG. 1, the sewage denitrification carrier preparation system also comprises a screening device 8 and a water recovery device 9 which are connected. The sieving device 8 is connected with a second outlet 31 at the lower part of the shaper 3 and is used for separating the shaping carrier and the cooling liquid discharged by the shaper 3; the separated molding carrier enters a product collecting device, and the separated cooling liquid enters a water recycling device 9 for treatment and recycling. The water recovery device 9 comprises a pre-sedimentation tank 91, a coagulation tank 92 and a post-sedimentation tank 93 which are sequentially arranged; wherein, the water inlet of the pre-sedimentation tank 91 is connected with the water outlet of the sieving device 8, the slag discharging port at the bottom of the pre-sedimentation tank 91 is connected with the drying device 51, the undersize impurities and the cooling liquid separated by the sieving device 8 enter the pre-sedimentation tank 91 for sedimentation pretreatment, and the produced sediment materials are discharged to the drying device 51 for drying and recycling to participate in cyclic utilization; the coagulation tank 92 is provided with a second stirrer 921 and a medicament adding device 922, and the second stirrer 921 and the medicament adding device 922 are in telecommunication connection with the controller 4 and are used for adding the coagulation medicament into the coagulation tank 92 and uniformly stirring and mixing; the water body after coagulation treatment enters a rear sedimentation tank 93, sedimentation separation is carried out in the rear sedimentation tank 93, the separated clean water is connected to a constant temperature water tank 7 through a clean water outlet at the upper part of the rear sedimentation tank 93, and the clean water obtained after treatment is recycled to supplement cooling liquid.
Example 2
The embodiment of the invention provides a preparation method of a sewage denitrification carrier, which comprises the following steps:
step S1, preparing materials according to the formula of the sewage denitrification carrier, and adding the prepared materials into a cavity of a material preparation reactor 1;
step S2, heating the materials from the periphery and the inside of the material preparation reactor 1 simultaneously to melt the materials, wherein the materials are heated uniformly in the melting process and are not easy to agglomerate;
step S3, after the materials in the material preparation reactor 1 are heated to a first preset temperature and/or heated to a first preset time period, the materials are melted to a specific state, the melted materials are stirred, and the heating and temperature control are continuously carried out during stirring, so that the materials are completely melted and uniformly mixed to prepare the required mixed liquid;
step S4, preheating the distributor 2, controlling the distributor 2 to preheat to a second preset temperature and/or a second preset time period, introducing the mixed solution prepared in the step S3 into the distributor 2, and continuously heating the distributor 2 at a controlled temperature to enable the mixed solution to be distributed through the distributor 2 to form liquid drops;
and S5, dripping the liquid drops formed in the step S4 into the cooling liquid to cool, so as to form the molded carrier. And separating the cooled molded carrier from the cooling liquid to obtain the required denitrification carrier.
The method can directly adopt solid sulfur powder as a main production raw material, heat materials in and out of a preparation reactor at the same time, and stir the materials after the materials are melted to a certain state, so that the problems that the melting process is heated unevenly, agglomeration is easy, the materials are mixed unevenly and the like easily occur when the sulfur powder is taken as the main raw material and a large amount of auxiliary materials are added to produce a denitrification carrier can be effectively solved; and the preparation method has lower cost in equipment investment, raw material transportation and storage, simple and convenient preparation process operation and flexible output regulation and control, and can better meet the preparation requirements of medium and small-scale carriers compared with a process adopting liquid sulfur as a main raw material.
Example 3
The embodiment of the invention provides a preparation method of a sewage denitrification carrier, which further comprises a step S6 and a step S7 on the basis of the embodiment 2;
s6, when the mixed liquid in the material preparation reactor 1 is introduced into the distributor 2 to form liquid drops so as to prepare the denitrification carrier, stopping introducing the mixed liquid into the distributor 2 when the residual quantity of the mixed liquid in the material preparation reactor 1 is less than 5% -25% of the initial quantity, namely, the residual mixed liquid is no longer used for preparing the carrier; the remaining mixed liquid is discharged, collected, dried and ground to obtain the recovered base material.
The liquid level of the initial mixed liquid can be collected through the liquid level monitor 16, the real-time liquid level change in the material preparation reactor 1 is monitored through the liquid level monitor 16, and the mixed liquid is stopped from being fed into the distributor 2 when the residual quantity of the mixed liquid reaches a preset value.
And S7, using the recovery primer collected in the step S6 for preparing materials in the step S1. The recovery bottom material can be recovered and reused by 100 percent.
The mixed liquid of the bottom layer and the upper layer in the material preparation reactor 1 is often mixed unevenly due to the different specific gravities of auxiliary materials, and the steps S6 and S7 are arranged and can be used for recycling the liquid of the bottom layer and/or the upper layer in the material preparation reactor 1 so as to ensure that the quality of the prepared carrier is more stable and reduce the waste of materials.
Example 4
The embodiment of the invention provides a preparation method of a sewage denitrification carrier, and on the basis of the embodiment 2 or the embodiment 3, the formula of the denitrification carrier (namely the material prepared in the step S1) in the method comprises sulfur powder, an alkalinity donor material, an additive and the like.
Wherein the alkalinity donor material may be CaCO 3 、MgCO 3 、Na 2 CO 3 And FeCO 3 The particle size of the alkalinity donor material is controlled to be 2-500 mu m.
The additive may be Fe 3 O 4 、Fe 2 O 3 、FeS 2 、CaCl 2 And one or more of NaCl, KCl, sodium alginate and diatomite, wherein the particle size of the additive is controlled to be 0.1-500 mu m.
Preferably, the mass ratio of the alkalinity donor material to the additives should not exceed 35% of the total material mass, so as to ensure that a denitrification carrier with uniform mixing and stable quality and excellent denitrification effect is obtained.
When materials are prepared, the recovered base material can be used as a raw material for preparation, and the particle size of the recovered base material is controlled to be 2-500 mu m; when the recovered base material is used for preparing the initial materials, the addition amount of the recovered base material should be controlled to be not more than 90% of the total mass.
During preparation, in the step S3, when the materials in the material preparation reactor 1 are heated simultaneously, the first preset temperature is controlled within the range of 115-185 ℃, and the first preset time period is controlled within the range of 10-200 min.
In the step S4, when the distributor 2 is preheated, controlling the second preset temperature to be in the range of 110-180 ℃ and the second preset time length to be in the range of 10-60 min; and controlling the temperature of the distributor 2 to be 105-160 ℃ continuously in temperature control and heating when the distributor 2 distributes and forms liquid drops.
In step S5, the temperature of the cooling liquid is controlled within a range of 15-65 ℃, preferably 60-65 ℃.
Example 5
The embodiment of the invention provides a preparation method of a sewage denitrification carrier, which is suitable for the sewage denitrification carrier preparation system in the embodiment 1.
The preparation method of the sewage denitrification carrier comprises the following steps:
step S1, preparing uniformly mixed materials in a batching box 6 according to the formula of the sewage denitrification carrier, and then adding the prepared materials into a cavity of a material preparation reactor 1;
step S2, the controller 4 controls the first heating sleeve 13 and the built-in heater 14 to be started, and the periphery and the inside of the material preparation reactor 1 heat the materials simultaneously to melt the materials; preferably, the heating temperature of the first heating sleeve 13 is controlled to be 115-185 ℃, and the heating time is controlled to be 10-200 min; the heating temperature of the built-in heater 14 is controlled to be 115-185 ℃, and the heating time is controlled to be 10-200 min.
Step S3, after the materials in the material preparation reactor 1 are heated to a first preset temperature (115-185 ℃) and/or heated to a first preset time (10-200 min), the materials are melted to a specific state; starting the first stirrer 15 to stir the melted materials, and continuously heating and controlling the temperature during stirring to completely melt and uniformly mix the materials to prepare the required mixed liquid;
preferably, the stirring speed is controlled at 20-250 rpm, the stirring time is controlled at 15-60 min, and the uniformly mixed liquid can be obtained.
In step S4, during the step S3, the controller 4 controls the second heating jacket 21 to start, preheats the distributor 2, controls the distributor 2 to preheat to a second preset temperature (110-180 ℃) and/or a second preset time period (10-60 min), and then introduces the mixed solution prepared in the step S3 into the distributor 2, and continuously heats the distributor 2 at a controlled temperature, wherein the continuously controlled temperature is controlled to be 105-160 ℃, so that the mixed liquid is distributed through the distributor 2 to form liquid drops.
And step S5, dripping the liquid drops formed in the step S4 into the cooling liquid of the former 3 to cool, thereby forming the molded carrier.
Step S51, the controller 4 controls the circulating water pump 711 and the constant temperature water tank 7 to operate, so that the cooling liquid in the former 3 is maintained within the range of 15-65 ℃ and the cooling liquid in the former 3 is maintained at the set liquid level;
s52, after the formed carrier is cooled and formed, discharging from the bottom of the forming device 3 and screening by a screening device 8, wherein the formed carrier on the screen enters a product collecting device, and the required sewage denitrification carrier is obtained after drying treatment; impurities entering the screen below and cooling liquid enter a water recovery device 9;
step S53, the pre-sedimentation tank 91 of the water recovery device 9 performs gravity sedimentation on the recovered impurities and the water body, and the fine impurities are collected from the bottom of the pre-sedimentation tank 91 and conveyed to the drying device 51 for drying, grinding, recycling; supernatant from the pre-sedimentation tank 91 enters a coagulation tank 92 for chemical coagulation treatment, the treated supernatant enters a post-sedimentation tank 93 for sedimentation treatment, and the precipitated supernatant is replenished to the constant temperature water tank 7 for recycling.
Step S6, collecting the liquid level height of the initial mixed liquid in the material preparation reactor 1 through a liquid level monitor 16, monitoring the real-time liquid level change in the material preparation reactor 1 through the liquid level monitor 16, and stopping introducing the mixed liquid into the distributor 2 when the residual amount of the mixed liquid reaches a preset value (less than 5% -25% of the initial amount); at this time, the flow rate adjusting valve 22 is closed, the bed charge emptying valve 501 is opened, the remaining mixed liquid is discharged into the bed charge collector 5 to be collected, the mixed liquid in the bed charge collector 5 is solidified and then is sent to the drying device 51 to be dried, and the dried mixed liquid is ground by the grinding device 52 to obtain the recovered bed charge.
And S7, adding the recovered base material collected in the step S6 into a batching box 6 according to a proportion for preparing initial materials in the step S1.
Claims (10)
1. A sewage denitrification carrier preparation system, comprising:
the material preparation reactor is provided with a feed inlet and a discharge outlet and is used for heating and melting and mixing materials to form mixed liquid;
the distributor is connected with a discharge port of the material preparation reactor and is used for enabling the mixed liquid to form liquid drops;
the former is positioned below the distributor, is internally provided with cooling liquid and is used for cooling the liquid drops into a forming carrier; and
A controller;
wherein, the material preparation reactor is also provided with a first heating sleeve, a built-in heater and a first stirrer;
the first heating sleeve is positioned at the periphery of the cavity of the material preparation reactor and is used for heating materials in the cavity from outside to inside;
the built-in heater is positioned in the cavity and used for heating materials from the inside of the cavity;
the stirring paddles of the first stirrer are inserted into the cavity of the material preparation reactor from top to bottom and are used for stirring materials;
the controller is in telecommunication connection with the first heating jacket, the built-in heater and the first stirrer.
2. The sewage denitrification carrier preparation system according to claim 1, wherein the distributor is provided with a second heating jacket;
and/or a flow regulating valve is arranged between the distributor and the discharge port;
the second heating jacket and the flow regulating valve are in telecommunication connection with the controller.
3. The sewage denitrification carrier preparation system according to claim 1 or 2, wherein the cavity of the material preparation reactor comprises a first zone at an upper part and a second zone, a third zone and a fourth zone at a lower part;
the third area and the fourth area are positioned at two sides of the second area and are respectively separated from the second area and the first area through baffles;
the upper side of the third zone is provided with a first inlet communicated with the first zone, and the discharge port is arranged in the third zone;
the lower part of the side surface of the fourth zone is provided with a second inlet communicated with the second zone, and the fourth zone is also provided with a first outlet connected to the outside of the cavity of the material preparation reactor;
and/or a liquid level monitor is arranged in the cavity of the material preparation reactor, and the liquid level monitor is in telecommunication connection with the controller.
4. The sewage denitrification carrier preparation system according to claim 3, further comprising a bed charge collector, a drying device, a grinding device and a batching box which are sequentially arranged;
the bottom material collector is connected with the first outlet through a first pipeline, a bottom material draining valve is arranged on the first pipeline, and the bottom material draining valve is in telecommunication connection with the controller;
the batching box is connected with the feed inlet and is used for providing configured materials for the material preparation reactor.
5. The sewage denitrification carrier preparation system according to claim 4, further comprising a constant temperature water tank, wherein a water inlet of the constant temperature water tank is connected with a water outlet of the former through a second pipeline, and a water outlet of the constant temperature water tank is connected with a water inlet of the former through a third pipeline;
and the second pipeline is provided with a circulating water pump, and the circulating water pump and the constant-temperature water tank are in telecommunication connection with the controller.
6. The sewage denitrification carrier preparation system according to claim 5, further comprising a screen and a water recovery device;
the screening device is connected with the second outlet of the former and is used for separating the forming carrier and the cooling liquid discharged by the former;
the water recovery device comprises a pre-sedimentation tank, a coagulation tank and a post-sedimentation tank which are sequentially arranged;
the pre-sedimentation tank is connected with the screening device and the drying device;
the coagulation tank is provided with a second stirrer and a medicament adding device, and the second stirrer and the medicament adding device are in telecommunication connection with the controller;
and a clear water outlet of the rear sedimentation tank is connected to the constant temperature water tank.
7. The preparation method of the sewage denitrification carrier is characterized by comprising the following steps:
s1, preparing materials, and adding the materials into a material preparation reactor;
s2, heating materials from the periphery and the inside of the material preparation reactor simultaneously;
step S3, after the materials are heated to a first preset temperature and/or a first preset time period, stirring the materials to enable the materials to be melted and mixed into mixed liquid;
s4, preheating a distributor, introducing the mixed liquid after the distributor is preheated to a second preset temperature and/or a second preset time period, and continuously heating the distributor at a controlled temperature to enable the mixed liquid to be distributed into liquid drops through the distributor;
and S5, dripping the liquid drops into cooling liquid to be cooled into a molding carrier.
8. The method for preparing a sewage denitrification carrier according to claim 7, further comprising:
s6, stopping introducing the mixed liquid into the distributor when the residual amount of the mixed liquid in the material preparation reactor is less than 5% -25% of the initial amount, and collecting, drying and grinding the residual mixed liquid to obtain a recovered bottom material;
and S7, using the recovered primer in the preparation material in the step S1.
9. The method for preparing a sewage denitrification carrier according to claim 7 or 8, wherein the materials comprise sulfur powder, an alkalinity donor material and an additive:
the alkalinity donor material comprises CaCO 3 、MgCO 3 、Na 2 CO 3 、FeCO 3 The particle size of the alkalinity donor is 2-500 mu m;
and/or the additive comprises Fe 3 O 4 、Fe 2 O 3 、FeS 2 、CaCl 2 One or more of NaCl, KCl, sodium alginate and diatomite, wherein the additiveThe particle size of the agent is 0.1-500 mu m;
and/or the mass ratio of the alkalinity donor material and the additive is not more than 35% of the total mass of the material.
10. The method for preparing a sewage denitrification carrier according to claim 7, wherein:
the first preset temperature is 115-185 ℃, and the first preset time period is 10-200 min;
and/or the second preset temperature is 110-180 ℃, the second preset time is 10-60 min, and the temperature of the distributor for continuous temperature control and heating is 105-160 ℃;
and/or the temperature of the cooling liquid is 15-65 ℃.
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