CN110698014A - Harmless treatment process for domestic sludge - Google Patents
Harmless treatment process for domestic sludge Download PDFInfo
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- CN110698014A CN110698014A CN201911076381.0A CN201911076381A CN110698014A CN 110698014 A CN110698014 A CN 110698014A CN 201911076381 A CN201911076381 A CN 201911076381A CN 110698014 A CN110698014 A CN 110698014A
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- sludge
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F11/00—Treatment of sludge; Devices therefor
- C02F11/02—Biological treatment
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F11/00—Treatment of sludge; Devices therefor
- C02F11/004—Sludge detoxification
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F11/00—Treatment of sludge; Devices therefor
- C02F11/02—Biological treatment
- C02F11/04—Anaerobic treatment; Production of methane by such processes
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F11/00—Treatment of sludge; Devices therefor
- C02F11/10—Treatment of sludge; Devices therefor by pyrolysis
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F11/00—Treatment of sludge; Devices therefor
- C02F11/12—Treatment of sludge; Devices therefor by de-watering, drying or thickening
- C02F11/13—Treatment of sludge; Devices therefor by de-watering, drying or thickening by heating
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10B—DESTRUCTIVE DISTILLATION OF CARBONACEOUS MATERIALS FOR PRODUCTION OF GAS, COKE, TAR, OR SIMILAR MATERIALS
- C10B53/00—Destructive distillation, specially adapted for particular solid raw materials or solid raw materials in special form
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10B—DESTRUCTIVE DISTILLATION OF CARBONACEOUS MATERIALS FOR PRODUCTION OF GAS, COKE, TAR, OR SIMILAR MATERIALS
- C10B57/00—Other carbonising or coking processes; Features of destructive distillation processes in general
- C10B57/08—Non-mechanical pretreatment of the charge, e.g. desulfurization
- C10B57/10—Drying
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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
- C02F2303/00—Specific treatment goals
- C02F2303/06—Sludge reduction, e.g. by lysis
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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
- Y02W10/40—Valorisation of by-products of wastewater, sewage or sludge processing
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Organic Chemistry (AREA)
- Hydrology & Water Resources (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Materials Engineering (AREA)
- Health & Medical Sciences (AREA)
- Molecular Biology (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Mechanical Engineering (AREA)
- Treatment Of Sludge (AREA)
- Processing Of Solid Wastes (AREA)
Abstract
The invention discloses a domestic sludge harmless treatment process which comprises six parts of material pretreatment, constant-temperature closed fermentation, heat energy drying, molding, pyrolysis gasification and heat energy utilization. In the application process, organic matters in the sludge are all pyrolyzed and gasified into combustible gas, inorganic matters are discharged in the form of ash slag and can be used as building raw materials or soil conditioners, the heat contained in tail gas and the heat contained in the generated combustible gas can be used in a heat energy drying process and a constant-temperature closed fermentation process, and the combustible gas can be used as clean energy for clean energy equipment, so that the sludge can be harmlessly treated in the whole process, the reasonable application of substances contained in the sludge is realized, the harmlessness, reduction and recycling treatment of the municipal sludge are further realized, and the popularization and the application are facilitated.
Description
Technical Field
The invention relates to the technical field of sludge treatment, in particular to a domestic sludge harmless treatment process.
Background
The current municipal sewage treatment project develops rapidly. Sludge is a product of sewage treatment plants, contains various pathogens and heavy metal elements, and causes secondary pollution to the environment due to improper disposal. With the construction and development of sewage treatment projects, the treatment and utilization of sludge become more and more serious problems to be solved urgently. Therefore, a domestic sludge harmless treatment process is provided.
Disclosure of Invention
The invention aims to solve the defects in the prior art and provides a domestic sludge harmless treatment process.
In order to achieve the purpose, the invention adopts the following technical scheme:
a domestic sludge harmless treatment process comprises six parts of material pretreatment, constant-temperature closed fermentation, heat energy drying, molding, pyrolysis gasification and heat energy utilization, and the process steps among the parts are as follows:
s1: pre-material disposal
The method comprises the steps of obtaining sludge of an urban sewage treatment plant, adding a conditioner and sludge fermentation strains into the sludge, and mixing the sludge, the conditioner and the sludge fermentation strains by using mixing and stirring equipment to obtain a mixed sludge material;
s2: constant temperature closed fermentation
Fermenting the mixed sludge material obtained in the step S1 in a constant-temperature closed environment, performing harmless treatment on waste gas generated in the fermentation process, and obtaining fermented sludge after the fermentation is finished, wherein the water content of the fermented sludge is 45%;
s3: thermal energy drying
Heating and dehydrating the fermented sludge obtained in the step S2 by using heat energy, namely performing heat drying and dehydration, and obtaining dried sludge when the water content of the fermented sludge is lower than 25%;
s4: shaping of
Putting the dried sludge obtained in the step S3 into a material molding machine for molding processing, and obtaining a molded sludge material;
s5: pyrolysis gasification
And (4) putting the formed sludge material obtained in the step (S4) into a pyrolysis gasification type gasification furnace for pyrolysis gasification, and along with the pyrolysis gasification, generating combustible gas, tail gas and ash slag in the pyrolysis gasification process, wherein the ash slag can be used as a soil conditioner or a road building material raw material.
S6: thermal energy utilization
The tail gas obtained in the step S5 is transmitted to the step S3 for heat drying, and then is purified and then is treated and discharged; the combustible gas obtained in the step S5 can transfer the contained heat to the step S2 through a heat exchange system, and the heat is used for the constant-temperature closed fermentation in the step S2; the combustible gas obtained in step S5 can be used as clean energy for clean energy equipment.
Preferably, in the step S1, the separated and crushed organic waste may be fed into the mixer during the mixing step, and the water content of the sludge of the municipal sewage treatment plant obtained in the step S1 may be 80%.
Preferably, the other organic waste comprises kitchen waste and plant straws.
Preferably, the constant-temperature closed environment is a constant-temperature closed type silo or a constant-temperature closed type silo pool.
Preferably, in step S2, the fermented sludge obtained after the fermentation may be used as soil for gardens.
Preferably, in step S4, the obtained shaped sludge material can be directly used as an alternative fuel for energy consuming enterprises.
The harmless treatment process of the domestic sludge, provided by the invention, has the beneficial effects that: after the sludge is subjected to material pretreatment, high-temperature closed fermentation is adopted to perform high-temperature fermentation type harmless treatment on the sludge, then the sludge is subjected to heat energy drying and forming treatment, organic matters in the sludge are pyrolyzed and gasified into combustible gas, inorganic matters are discharged in the form of ash and slag and are used as building raw materials or soil conditioners, the heat contained in tail gas and the heat contained in the generated combustible gas can be used in a heat energy drying process and a constant-temperature closed fermentation process, and the combustible gas can be used as clean energy to be applied to clean energy equipment, so that the harmless treatment on the sludge can be realized in the whole process, the reasonable application of substances contained in the sludge is realized, the harmless, reduction and recycling treatment of the municipal sludge is realized, and the popularization and application are facilitated.
Drawings
FIG. 1 is a process flow diagram of a harmless treatment process of domestic sludge according to the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments.
In the description of the present invention, it is to be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention.
Referring to fig. 1, the harmless treatment process of the domestic sludge comprises six parts of material pretreatment, constant-temperature closed fermentation, heat energy drying, molding, pyrolysis gasification and heat energy utilization, and the process steps among the parts are as follows:
s1: pre-material disposal
The method comprises the steps of obtaining sludge of an urban sewage treatment plant, adding a conditioner and sludge fermentation strains into the sludge, and mixing the sludge, the conditioner and the sludge fermentation strains by using mixing and stirring equipment to obtain a mixed sludge material;
s2: constant temperature closed fermentation
Fermenting the mixed sludge material obtained in the step S1 in a constant-temperature closed environment, performing harmless treatment on waste gas generated in the fermentation process, and obtaining fermented sludge after the fermentation is finished, wherein the water content of the fermented sludge is 45%;
s3: thermal energy drying
Heating and dehydrating the fermented sludge obtained in the step S2 by using heat energy, namely performing heat drying and dehydration, and obtaining dried sludge when the water content of the fermented sludge is lower than 25%;
s4: shaping of
Putting the dried sludge obtained in the step S3 into a material molding machine for molding processing, and obtaining a molded sludge material;
s5: pyrolysis gasification
And (4) putting the formed sludge material obtained in the step (S4) into a pyrolysis gasification type gasification furnace for pyrolysis gasification, and along with the pyrolysis gasification, generating combustible gas, tail gas and ash slag in the pyrolysis gasification process, wherein the ash slag can be used as a soil conditioner or a road building material raw material.
S6: thermal energy utilization
The tail gas obtained in the step S5 is transmitted to the step S3 for heat drying, and then is purified and then is treated and discharged; the combustible gas obtained in the step S5 can transfer the contained heat to the step S2 through a heat exchange system, and the heat is used for the constant-temperature closed fermentation in the step S2; the combustible gas obtained in step S5 can be used as clean energy for clean energy equipment.
In the step S1, other organic waste after separation and crushing may be put into the mixing apparatus in the process of the mixing step, and the water content of the sludge of the municipal sewage treatment plant obtained in the step S1 may be 80%.
The other organic wastes comprise kitchen garbage and plant straws.
The constant-temperature closed environment is a constant-temperature closed type bin tank or a constant-temperature closed type bin pool.
In step S2, the fermented sludge obtained after the fermentation may be used as soil for gardens.
In step S4, the obtained shaped sludge material can be directly used as an alternative fuel for energy consuming enterprises.
After the sludge is subjected to material pretreatment, high-temperature closed fermentation is adopted to perform high-temperature fermentation type harmless treatment on the sludge, then the sludge is subjected to heat energy drying and forming treatment, organic matters in the sludge are pyrolyzed and gasified into combustible gas, inorganic matters are discharged in the form of ash and slag and are used as building raw materials or soil conditioners, the heat contained in tail gas and the heat contained in the generated combustible gas can be used in a heat energy drying process and a constant-temperature closed fermentation process, and the combustible gas can be used as clean energy to be applied to clean energy equipment, so that the harmless treatment on the sludge can be realized in the whole process, the reasonable application of substances contained in the sludge is realized, the harmless, reduction and recycling treatment of the municipal sludge is realized, and the popularization and application are facilitated.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.
Claims (6)
1. The harmless treatment process of the domestic sludge is characterized by comprising six parts of material pretreatment, constant-temperature closed fermentation, heat energy drying, molding, pyrolysis gasification and heat energy utilization, and the process steps among the parts are as follows:
s1: pre-material disposal
The method comprises the steps of obtaining sludge of an urban sewage treatment plant, adding a conditioner and sludge fermentation strains into the sludge, and mixing the sludge, the conditioner and the sludge fermentation strains by using mixing and stirring equipment to obtain a mixed sludge material;
s2: constant temperature closed fermentation
Fermenting the mixed sludge material obtained in the step S1 in a constant-temperature closed environment, performing harmless treatment on waste gas generated in the fermentation process, and obtaining fermented sludge after the fermentation is finished, wherein the water content of the fermented sludge is 45%;
s3: thermal energy drying
Heating and dehydrating the fermented sludge obtained in the step S2 by using heat energy, namely performing heat drying and dehydration, and obtaining dried sludge when the water content of the fermented sludge is lower than 25%;
s4: shaping of
Putting the dried sludge obtained in the step S3 into a material molding machine for molding processing, and obtaining a molded sludge material;
s5: pyrolysis gasification
And (4) putting the formed sludge material obtained in the step (S4) into a pyrolysis gasification type gasification furnace for pyrolysis gasification, and along with the pyrolysis gasification, generating combustible gas, tail gas and ash slag in the pyrolysis gasification process, wherein the ash slag can be used as a soil conditioner or a road building material raw material.
S6: thermal energy utilization
The tail gas obtained in the step S5 is transmitted to the step S3 for heat drying, and then is purified and then is treated and discharged; the combustible gas obtained in the step S5 can transfer the contained heat to the step S2 through a heat exchange system, and the heat is used for the constant-temperature closed fermentation in the step S2; the combustible gas obtained in step S5 can be used as clean energy for clean energy equipment.
2. The process according to claim 1, wherein in the step S1, the separated and crushed organic waste is fed into the mixer during the mixing step, and the water content of the sludge from the municipal sewage treatment plant obtained in the step S1 is 80%.
3. The harmless treatment process of domestic sludge according to claim 2, wherein said other organic waste comprises kitchen waste, plant straw.
4. The harmless treatment process of domestic sludge according to claim 1, wherein the constant temperature closed environment is a constant temperature closed silo or a constant temperature closed silo.
5. The harmless treatment process of domestic sludge according to claim 1, wherein in step S2, the fermented sludge obtained after fermentation can be used as soil for gardens.
6. The harmless treatment process of domestic sludge according to claim 1, wherein in step S4, the obtained shaped sludge material can be directly used as energy-consuming enterprise alternative fuel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911076381.0A CN110698014A (en) | 2019-11-06 | 2019-11-06 | Harmless treatment process for domestic sludge |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911076381.0A CN110698014A (en) | 2019-11-06 | 2019-11-06 | Harmless treatment process for domestic sludge |
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| CN110698014A true CN110698014A (en) | 2020-01-17 |
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| CN201911076381.0A Pending CN110698014A (en) | 2019-11-06 | 2019-11-06 | Harmless treatment process for domestic sludge |
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Citations (11)
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|---|---|---|---|---|
| JPS58205593A (en) * | 1982-05-22 | 1983-11-30 | Nippon Kaihatsu Consultant:Kk | Treatment of leather sludge containing heavy metals consisting essentially of chromium |
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2019
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| CN106277667A (en) * | 2016-08-29 | 2017-01-04 | 西南化工研究设计院有限公司 | A kind of reclaiming city domestic sludge utilizes technique |
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