CN111848113A - Method and device for realizing efficient reduction and recycling of dewatered sludge by hydrothermal system - Google Patents
Method and device for realizing efficient reduction and recycling of dewatered sludge by hydrothermal system Download PDFInfo
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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
- C04B30/00—Compositions for artificial stone, not containing binders
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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
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/00017—Aspects relating to the protection of the environment
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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
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/50—Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength
Abstract
The invention discloses a method for realizing efficient reduction and resource treatment of dewatered sludge by a hydrothermal system, wherein dewatered sludge generated after a mechanical dewatering process of a sewage treatment plant is preheated by a preheating system and then enters a hydrothermal reactor, the reactor is provided with an additive quantitative supply system and an auxiliary heating system, after the reaction is finished and cooling and heat exchange are carried out, the dewatered sludge is separated by a gas-liquid-solid three-phase separator, a main product of a gas-phase product is hydrogen-rich gas, and the gas-phase product can be used as an auxiliary heat source of the hydrothermal reactor after purification; and (3) performing liquid-solid cyclone separation and then compressing, returning a liquid-phase product to a front-stage regulating reservoir of a sewage treatment plant, purifying by a sewage treatment process, collecting a solid-phase product, mixing and stirring the solid-phase product with an ecological block curing agent, and forming a baking-free ecological block product by a compression molding process. The method of the invention realizes the high-efficiency reduction and the final resource treatment of the dewatered sludge and other similar wet organic solid wastes to a great extent, and fundamentally solves the final outlet problem of the municipal sludge.
Description
Technical Field
The invention belongs to the field of resource environment, and particularly relates to a method and a device for realizing efficient reduction and resource treatment of dewatered sludge by a hydrothermal system.
Background
The dewatered sludge is used as a terminal product of sewage treatment, has complex and various components, contains rich organic matters, nitrogen, phosphorus and other nutrient substances, simultaneously carries a large number of pathogens, pathogenic bacteria and other microorganisms, and potentially contains heavy metals, persistent organic pollutants and other toxic and harmful substances. With the increasing of the investment of the sewage treatment industry in recent years, the annual output of sludge is increased greatly due to the increase of urban sewage output, treatment capacity and treatment rate year by year, so that the problem of treatment and disposal of dewatered sludge is more and more prominent, and how to safely and effectively solve the problem of treatment and resource utilization of sludge becomes one of the major environmental problems faced by China and even countries all over the world.
The application effect of the currently common sludge treatment and disposal technology is limited by the high content of water which is not easy to remove in the sludge and the pollutants such as heavy metals and polycyclic aromatic hydrocarbons with risks, and the complex pretreatment and the potential risk of secondary pollution compel the current urgent need to find a safe treatment and disposal technology which is not limited by the water content and can realize efficient decrement and stable or resource utilization of the pollutants. Based on the unique physicochemical property of the hydrothermal treatment technology, the water can be just used as a reaction medium, so that the dehydration link with high energy consumption is crossed. Therefore, the hydrothermal technology has feasibility of solving the efficient reduction and resource treatment of the dewatered sludge.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a method for realizing efficient reduction and resource treatment of dewatered sludge by a hydrothermal system.
The above purpose of the invention is realized by the following technical scheme:
a method for realizing efficient reduction and resource treatment of dewatered sludge by a hydrothermal system comprises the following steps:
s1: the dewatered sludge enters a hydrothermal reaction system after being preheated by a preheating system; the hydrothermal reaction system is connected with an additive quantitative estimation system and an auxiliary heating system;
s2: after the reaction is finished, cooling and heat exchange are carried out, and the reaction product enters a gas-liquid-solid separation system; after being separated by a gas-liquid-solid separation system, a gas-phase product enters a gas-phase purification device, and enters an auxiliary heat system after being purified to serve as an auxiliary heat source; the liquid and solid phases enter a liquid and solid cyclone separation system; meanwhile, the gas-liquid-solid separation system is connected with a heat exchange system, and the heat exchange system is connected with a waste heat system;
s3: after passing through a liquid-solid cyclone separation system, a liquid product enters an adjusting tank; and (4) the solid phase residue enters a compression molding device, and the ecological building block is obtained after compression molding.
Preferably, in S1, the dewatered sludge is dewatered sludge generated after a mechanical dewatering process, and the water content of the dewatered sludge raw material is 60-90%.
Preferably, in S1, the hydrothermal reaction system is a hydrothermal reactor.
Preferably, in S1, in the additive quantitative supply system, NaOH and hydrogen peroxide are used as reaction additives, the equivalent ratio of the oxidant is 0-3, the catalyst is 0-5 wt.%, and the reaction conditions are 376-500 ℃, 22-25 MPa and 0.5-15 min.
Preferably, in the step S3, in the compression molding process, the solid phase residue is mixed with the ecological block curing agent and stirred, and the baking-free ecological block is formed through the compression molding process.
Preferably, in S3, the used ecological block curing agent comprises, in mass percent, Al2O3：15～30，SiO2：2～5，CaO：28～40，Fe2O3：2～5，SO3：10～20。
Preferably, in S3, the solid phase residue and 2-25 wt.% of ecological block curing agent are uniformly stirred and then enter a compression molding machine, and the mixture is molded and maintained for 3-10 d to obtain an ecological block product.
The method comprises the following steps that dewatered sludge generated after a mechanical dewatering process enters a hydrothermal reaction system after being preheated by a preheating system, the reaction system is provided with an additive quantitative supply system and an auxiliary heating system, after cooling and heat exchange are completed in the reaction, the mixture is separated by a gas-liquid-solid three-phase separator, a main product of a gas-phase product is a hydrogen-rich gas, and the hydrogen-rich gas can be used as an auxiliary heat source of a hydrothermal reactor after being purified; and the liquid-solid cyclone separation and compression are carried out, the liquid-phase product returns to a front-section regulating reservoir of a sewage treatment plant, the liquid-phase product is purified by a sewage treatment process, the solid-phase product is collected and then mixed and stirred with an ecological block curing agent, and a burning-free ecological block product is formed by a compression molding process, so that the high-efficiency reduction and resource treatment of the dewatered sludge of a hydrothermal system are realized, and the final outlet problem of the municipal sludge is solved.
The invention also discloses a device for realizing the efficient reduction and resource treatment of the dewatered sludge by the hydrothermal system, which comprises a hydrothermal reaction system, an additive quantitative supply system, an auxiliary heating system, a gas-liquid-solid three-phase separation system, a liquid-solid cyclone separation system, a compression molding device, an adjusting tank and a heat exchange system; the preheating system is connected with a hydrothermal reaction system, the hydrothermal reaction system is connected with a gas-liquid-solid separation system, and the hydrothermal reaction system is connected with an additive quantitative supply system and an auxiliary heating system; a gas phase outlet of the gas-liquid-solid separation system is connected with a gas phase purification device, and the gas phase purification device is connected with an auxiliary heating system; the gas-liquid-solid separation system is also connected with a heat exchange system, and the heat exchange system is connected with a preheating system; a liquid-solid phase outlet of the gas-liquid-solid separation system is connected with a liquid-solid cyclone separation system, and a liquid phase outlet of the liquid-solid cyclone separation system is connected with a regulating tank; and a solid phase outlet of the liquid-solid cyclone separation system is connected with a compression molding device.
Further, the hydrothermal reaction system is a hydrothermal reactor.
Further, the compression device is connected with a solidified material supply device.
Further, the mechanical dehydration system is connected with a preheating system, and the preheating system is connected with the hydrothermal reaction system.
Has the advantages that:
1. the ecological building block prepared by the invention has the advantages that the indexes such as quality, strength and the like meet the performance of the ecological building block products on the market, the ecological building block has good adsorption performance, the ecological building block has good biological loading performance on a surface layer porous structure, the attachment of microorganisms in the using process is convenient, the purifying capacity is improved, the preparation method is simple, and the cost is low;
2. the technical scheme provided by the invention can obtain the energy-utilized high-quality hydrogen-rich gas which can be used as an auxiliary heat source to offset the heat loss of the system and realize the self-sustaining balance of the process energy as a whole;
3. the technical scheme provided by the invention takes the dewatered sludge as a treatment object, forms a hydrothermal medium by using water which is not easy to remove from the dewatered sludge, goes through a conventional dewatering and drying link which consumes more energy, mainly comprises main micromolecule organic matters, ammonia nitrogen and the like in a liquid-phase product, can return to the front section of a sewage treatment process to realize subsequent treatment, and realizes zero emission of the dewatered sludge by using a residual solid-phase product in the form of an ecological building block product. Finally, the efficient reduction, harmless treatment and resource utilization of the dewatered sludge are synchronously realized in an economic and effective mode, and the method has good application prospect.
Drawings
FIG. 1 is a process flow diagram for realizing efficient reduction and recycling of dewatered sludge in a hydrothermal system.
Detailed Description
The following detailed description of the present invention is provided in connection with the accompanying drawings and examples, but not intended to limit the scope of the invention.
Example 1: hydrothermal treatment of dewatered sludge
As shown in fig. 1, a method for realizing efficient reduction and resource treatment of dewatered sludge by a hydrothermal system comprises the following steps:
s1: preheating dewatered sludge (the water content of the dewatered sludge raw material is 60-90%) generated after the mechanical dewatering process by a preheating system, and then feeding the preheated sludge into a hydrothermal reactor; the hydrothermal reactor is connected with an additive quantitative estimation system and an auxiliary heating system; the additive quantitative supply system takes NaOH and hydrogen peroxide as reaction additives, the equivalent ratio of oxidant is 0-3, the catalyst is 0-5 wt.%, and the reaction conditions are 376-500 ℃ of temperature, 22-25 Mpa of pressure and 0.5-15 min of time.
S2: after the reaction is finished, cooling and heat exchange are carried out, and the reaction product enters a gas-liquid-solid separation system; after being separated by a gas-liquid-solid separation system, a gas-phase product enters a gas-phase purification device, and enters an auxiliary heat system after being purified to serve as an auxiliary heat source; the liquid and solid phases enter a liquid and solid cyclone separation system; meanwhile, the gas-liquid-solid separation system is connected with a heat exchange system, and the heat exchange system is connected with a waste heat system;
s3: after passing through a liquid-solid cyclone separation system, a liquid product enters an adjusting tank; and (4) the solid phase residue enters a compression molding device, and the ecological building block is obtained after compression molding. In the compression molding process, the solid phase residue is mixed and stirred with the ecological block curing agent, and the baking-free ecological block is formed through the compression molding process. The used curing agent for the ecological building block comprises the following chemical components in percentage by mass2O3：15～30，SiO2：2～5，CaO：28～40，Fe2O3：2～5，SO3: 10 to 20. And uniformly stirring the solid phase residue and 2-25 wt.% of ecological block curing agent by mass, then feeding the mixture into a compression molding machine, and curing for 3-10 days after molding to obtain an ecological block product.
Directly conveying dewatered sludge obtained after mechanical dewatering into a preheating system, controlling the water content of the dewatered sludge to be 80%, heating to 150 ℃ through the preheating system, pumping the dewatered sludge into a hydrothermal reactor by a plunger pump, continuously heating to 400 ℃ for hydrothermal reaction, and keeping the reaction residence time to be 5 min; and after the reaction gas-liquid-solid three-phase product is cooled and separated, collecting the gas-phase hydrogen-rich gas as an auxiliary heat source of the hydrothermal reactor, and returning the liquid-phase product to the front-stage sewage regulating tank to complete subsequent treatment to obtain the high-efficiency reduced solid-phase residue.
Example 2
As shown in figure 1, the invention also discloses a device for realizing the efficient reduction and recycling of dewatered sludge by the hydrothermal system, which comprises a hydrothermal reaction system, an additive quantitative supply system, an auxiliary heating system, a gas-liquid-solid three-phase separation system, a liquid-solid cyclone separation system, a compression molding device, a regulating tank and a heat exchange system; the preheating system is connected with the hydrothermal reaction system, the hydrothermal reaction system is connected with the gas-liquid-solid separation system, and the hydrothermal reaction system is connected with the additive quantitative supply system and the auxiliary heating system; a gas phase outlet of the gas-liquid-solid separation system is connected with a gas phase purification device, and the gas phase purification device is connected with an auxiliary heating system; the gas-liquid-solid separation system is also connected with a heat exchange system, and the heat exchange system is connected with a preheating system; a liquid-solid phase outlet of the gas-liquid-solid separation system is connected with the liquid-solid cyclone separation system, and a liquid phase outlet of the liquid-solid cyclone separation system is connected with the regulating tank; and a solid phase outlet of the liquid-solid cyclone separation system is connected with a compression molding device.
The hydrothermal reaction system is a hydrothermal reactor.
The compressing device is connected with the solidified material supply device.
The mechanical dehydration system is connected with the preheating system, and the preheating system is connected with the hydrothermal reaction system.
Example 3: preparation of ecological building block
And (3) uniformly stirring the solid-phase residue obtained in the example 1 and 10 wt.% of curing material, then feeding the mixture into a compression molding machine, and curing for 10 d after molding to obtain an ecological block product.
Example 4: ecological block index detection
The comparison results of the ecological block prepared in example 3 and the T/ZZB 0775-2018, a standard of Zhejiang manufacturing community, are shown in the following table:
the ecological block curing agent used in the invention is easy to prepare, simple in use method and low in cost.
The ecological building block prepared by the invention has the advantages of uniform specification, small density, high compressive strength and large specific surface area, not only the property index meets the existing ecological building block products and related standards in the market, but also the ecological building block shows a better biological carrier function, is convenient for attachment of a biological membrane and further exerts better purification capacity.
The technical scheme provided by the invention solves the problem of zero emission of the dewatered sludge generated in the water treatment industry by using a hydrothermal system for the first time, overcomes the conventional deep dewatering and drying link, realizes treatment and utilization of the dewatered sludge by using energy consumption far lower than that of the conventional incineration process, takes high-quality hydrogen-rich gas possibly recycled as a supplementary heat source, and finally realizes final elimination of the dewatered sludge waste by using solid-phase residues in the form of ecological building block products. The whole process realizes the new requirement of zero emission of pollutants and has good application prospect.
The above-described embodiments are intended to be illustrative of the nature of the invention, but those skilled in the art will recognize that the scope of the invention is not limited to the specific embodiments.
Claims (8)
1. A method for realizing efficient reduction and resource treatment of dewatered sludge by a hydrothermal system is characterized by comprising the following steps:
the method comprises the following steps:
s1: the dewatered sludge enters a hydrothermal reaction system after being preheated by a preheating system; the hydrothermal reaction system is connected with an additive quantitative estimation system and an auxiliary heating system;
s2: after the reaction is finished, cooling and heat exchange are carried out, and the reaction product enters a gas-liquid-solid separation system; after being separated by a gas-liquid-solid separation system, a gas-phase product enters a gas-phase purification device, and enters an auxiliary heat system after being purified to serve as an auxiliary heat source; the liquid and solid phases enter a liquid and solid cyclone separation system; meanwhile, the gas-liquid-solid separation system is connected with a heat exchange system, and the heat exchange system is connected with a waste heat system;
s3: after passing through a liquid-solid cyclone separation system, a liquid product enters an adjusting tank; and (4) the solid phase residue enters a compression molding device, and the ecological building block is obtained after compression molding.
2. The method for realizing efficient reduction and resource treatment of dewatered sludge by the hydrothermal system according to claim 1, wherein the method comprises the following steps: in S1, the dewatered sludge is the dewatered sludge generated after a mechanical dewatering process, and the water content of the dewatered sludge raw material is 60-90%.
3. The method for realizing efficient reduction and resource treatment of dewatered sludge by the hydrothermal system according to claim 1, wherein the method comprises the following steps: in S1, the hydrothermal reaction system is a hydrothermal reactor.
4. The method for realizing efficient reduction and resource treatment of dewatered sludge by the hydrothermal system according to claim 1, wherein the method comprises the following steps: in S1, the additive quantitative supply system takes NaOH and hydrogen peroxide as reaction additives, the equivalent ratio of oxidant is 0-3, the catalyst is 0-5 wt.%, and the reaction conditions are 376-500 ℃, 22-25 Mpa and 0.5-15 min.
5. The method for realizing efficient reduction and resource treatment of dewatered sludge by the hydrothermal system according to claim 1, wherein the method comprises the following steps: and S3, mixing and stirring the solid-phase residue and the ecological block curing agent in the compression molding process, and forming the baking-free ecological block through the compression molding process.
6. The method for realizing efficient reduction and resource treatment of dewatered sludge by the hydrothermal system according to claim 5, wherein the method comprises the following steps: in S3, the used ecological block curing agent comprises Al according to the mass percentage of chemical components2O3：15～30，SiO2：2～5，CaO：28～40，Fe2O3：2～5，SO3：10～20。
7. The method for realizing efficient reduction and resource treatment of the dewatered sludge by the hydrothermal system according to claim 5 or 6, wherein the method comprises the following steps: and in S3, uniformly stirring the solid phase residue and 2-25 wt.% of ecological block curing agent by mass, feeding into a compression molding machine, and curing for 3-10 days after molding to obtain an ecological block product.
8. The utility model provides a hydrothermal system realizes high-efficient decrement of dehydration mud and resourceful processing apparatus which characterized in that: the system comprises a hydrothermal reaction system, an additive quantitative supply system, an auxiliary heating system, a gas-liquid-solid three-phase separation system, a liquid-solid cyclone separation system, a compression molding device, a regulating tank and a heat exchange system; the preheating system is connected with a hydrothermal reaction system, the hydrothermal reaction system is connected with a gas-liquid-solid separation system, and the hydrothermal reaction system is connected with an additive quantitative supply system and an auxiliary heating system; a gas phase outlet of the gas-liquid-solid separation system is connected with a gas phase purification device, and the gas phase purification device is connected with an auxiliary heating system; the gas-liquid-solid separation system is also connected with a heat exchange system, and the heat exchange system is connected with a preheating system; a liquid-solid phase outlet of the gas-liquid-solid separation system is connected with a liquid-solid cyclone separation system, and a liquid phase outlet of the liquid-solid cyclone separation system is connected with a regulating tank; and a solid phase outlet of the liquid-solid cyclone separation system is connected with a compression molding device.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113845280A (en) * | 2021-10-25 | 2021-12-28 | 同济大学 | Method for enhancing sludge hydrothermal harmlessness through surfactant |
| CN113896387A (en) * | 2021-11-03 | 2022-01-07 | 南京工业职业技术大学 | Sludge purification and dehydration structure based on combination of thermal desorption technology and vacuum preloading technology and construction method thereof |
| CN114835362A (en) * | 2022-05-24 | 2022-08-02 | 浙江工业大学 | Treatment system and method for curing heavy metal through hydrothermal oxidation coupling oxygen control calcination of electroplating sludge |
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