CN114890639A - Device and process for deeply reducing sludge in sewage plant - Google Patents

Device and process for deeply reducing sludge in sewage plant Download PDF

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Publication number
CN114890639A
CN114890639A CN202210296446.8A CN202210296446A CN114890639A CN 114890639 A CN114890639 A CN 114890639A CN 202210296446 A CN202210296446 A CN 202210296446A CN 114890639 A CN114890639 A CN 114890639A
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sludge
water
tank body
tank
sewage plant
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王磊
王婷
宋帅楠
焦文海
卢立泉
李晓斌
任斌
程仁振
程拓
曹伟奎
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Jinan Municipal Engineering Design and Research Institute Group Co Ltd
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Jinan Municipal Engineering Design and Research Institute Group Co Ltd
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    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F11/00—Treatment of sludge; Devices therefor
    • C02F11/02—Biological treatment
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    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
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    • B01D53/34—Chemical or biological purification of waste gases
    • B01D53/38—Removing components of undefined structure
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/34—Chemical or biological purification of waste gases
    • B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
    • B01D53/84—Biological processes
    • 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
    • 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
    • C02F11/121—Treatment of sludge; Devices therefor by de-watering, drying or thickening by mechanical de-watering
    • C02F11/123—Treatment of sludge; Devices therefor by de-watering, drying or thickening by mechanical de-watering using belt or band filters
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F11/00—Treatment of sludge; Devices therefor
    • C02F11/12—Treatment of sludge; Devices therefor by de-watering, drying or thickening
    • C02F11/13—Treatment of sludge; Devices therefor by de-watering, drying or thickening by heating
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F11/00—Treatment of sludge; Devices therefor
    • C02F11/12—Treatment of sludge; Devices therefor by de-watering, drying or thickening
    • C02F11/14—Treatment of sludge; Devices therefor by de-watering, drying or thickening with addition of chemical agents
    • C02F11/147—Treatment of sludge; Devices therefor by de-watering, drying or thickening with addition of chemical agents using organic substances
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F11/00—Treatment of sludge; Devices therefor
    • C02F11/12—Treatment of sludge; Devices therefor by de-watering, drying or thickening
    • C02F11/14—Treatment of sludge; Devices therefor by de-watering, drying or thickening with addition of chemical agents
    • C02F11/148—Combined use of inorganic and organic substances, being added in the same treatment step
    • C—CHEMISTRY; METALLURGY
    • C05—FERTILISERS; MANUFACTURE THEREOF
    • C05F—ORGANIC FERTILISERS NOT COVERED BY SUBCLASSES C05B, C05C, e.g. FERTILISERS FROM WASTE OR REFUSE
    • C05F17/00—Preparation of fertilisers characterised by biological or biochemical treatment steps, e.g. composting or fermentation
    • C05F17/60—Heating or cooling during the treatment
    • C—CHEMISTRY; METALLURGY
    • C05—FERTILISERS; MANUFACTURE THEREOF
    • C05F—ORGANIC FERTILISERS NOT COVERED BY SUBCLASSES C05B, C05C, e.g. FERTILISERS FROM WASTE OR REFUSE
    • C05F17/00—Preparation of fertilisers characterised by biological or biochemical treatment steps, e.g. composting or fermentation
    • C05F17/80—Separation, elimination or disposal of harmful substances during the treatment
    • C—CHEMISTRY; METALLURGY
    • C05—FERTILISERS; MANUFACTURE THEREOF
    • C05F—ORGANIC FERTILISERS NOT COVERED BY SUBCLASSES C05B, C05C, e.g. FERTILISERS FROM WASTE OR REFUSE
    • C05F17/00—Preparation of fertilisers characterised by biological or biochemical treatment steps, e.g. composting or fermentation
    • C05F17/90—Apparatus therefor
    • C05F17/964—Constructional parts, e.g. floors, covers or doors
    • C05F17/971—Constructional parts, e.g. floors, covers or doors for feeding or discharging materials to be treated; for feeding or discharging other material
    • C05F17/986—Constructional parts, e.g. floors, covers or doors for feeding or discharging materials to be treated; for feeding or discharging other material the other material being liquid
    • C—CHEMISTRY; METALLURGY
    • C05—FERTILISERS; MANUFACTURE THEREOF
    • C05F—ORGANIC FERTILISERS NOT COVERED BY SUBCLASSES C05B, C05C, e.g. FERTILISERS FROM WASTE OR REFUSE
    • C05F7/00—Fertilisers from waste water, sewage sludge, sea slime, ooze or similar masses
    • 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
    • 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
    • Y02W10/20—Sludge processing

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  • Treatment Of Sludge (AREA)

Abstract

The invention discloses a device and a process for deeply reducing sludge in a sewage plant, which are characterized in that sludge with high water content, biomass auxiliary materials and sludge back-mixed materials are mixed and then are added into a tank body, and a biological agent is added into the tank body; heating oil is introduced into the heating coil on the side wall of the tank body to heat the sludge and stir the sludge at the same time; introducing air into the sludge through an air blower to provide oxygen; water vapor generated in the sludge fermentation process is condensed at the arc-shaped top cover and is collected at the two sides of the arc-shaped top cover, and the water vapor drips and is collected in the water collecting tank and is discharged outside through the water discharging pipe.

Description

Device and process for deeply reducing sludge in sewage plant
Technical Field
The invention belongs to the technical field of sludge treatment, and particularly relates to a process and a device for deeply reducing sludge in a sewage plant.
Background
The statements herein merely provide background information related to the present disclosure and may not necessarily constitute prior art.
At present, the water content of factory sludge of most sewage treatment plants is 80%, and the problems of large sludge amount, difficult transportation, serious odor and the like exist. The traditional sludge fermentation process is natural ventilation, the sludge inside the strip pile is usually in an anaerobic environment, and the water content of the sludge is reduced to 40 percent, and usually 20 to 40 days are needed; the novel aerobic fermentation technology of adding turning and oxygenating equipment is also required to be 7-10 days for reducing the water content of the sludge to 40%. In addition, the traditional sludge fermentation process has the defects that the internal temperature of the sludge is not uniformly distributed, the external temperature of the sludge is 20-30 ℃, the internal temperature can reach 65-75 ℃, the sludge fermentation is not uniform, and the water content of the treated sludge is not uniform.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide a process and a device for deeply reducing sludge in a sewage plant.
In order to realize the purpose, the invention is realized by the following technical scheme:
in a first aspect, the present invention provides an apparatus for deeply reducing sludge in a sewage plant, comprising: the stirring device is arranged in the tank body, the bottom of the tank body is connected with the air blower, and the outer wall of the tank body is provided with a heating coil;
the top cap is used for the lid to fit on jar body, and the inboard of top cap is the arc structure, and the both sides at jar internal wall top all are provided with the water catch bowl, and the bottom slope of water catch bowl sets up, and the lowest of water catch bowl bottom is connected with one side of drain pipe, and the opposite side of drain pipe runs through jar body, lies in outside the jar body to set up down.
In a second aspect, the invention provides a process for deeply reducing a sewage plant, which comprises the following steps: mixing the sludge with high water content, the biomass auxiliary material and the sludge back-mixed material, adding the mixture into a tank body, and adding a biological agent into the tank body;
heating oil is introduced into the heating coil on the side wall of the tank body to heat the sludge and stir the sludge at the same time;
Introducing air into the sludge through an air blower to provide oxygen;
water vapor generated in the sludge fermentation process is condensed at the arc-shaped top cover and is collected at the two sides of the arc-shaped top cover, and the water vapor drips and is collected in the water collecting tank and is discharged outside through the water discharging pipe.
The beneficial effects achieved by one or more of the above-mentioned embodiments of the invention are as follows:
the addition of the sludge reverse-mixing material and the biomass auxiliary material can reduce the water content of the sludge and enhance the air permeability of the sludge on the one hand, and can inoculate fermentation microorganisms for the new sludge on the other hand, so that the fermentation efficiency is improved.
The fermentation tank outer wall sets up heating coil, and heating boiler passes through the conduction oil and to jar body heating, sets up agitating unit in the fermentation cylinder, stirs mud at the fermentation in-process, guarantees that mud is heated evenly to stir the material. Meanwhile, the biological agent is added, and the biological agent mainly comprises various probiotics such as saccharomycetes, filamentous fungi, bacillus thermophilus, actinomyces thermophilus and the like, so that the biological dosage of the fermentation microorganisms is improved.
The fermentation tank is matched with the air blower, partial water vapor can be taken out along with tail gas in the process of oxygenating the fermentation tank, on the other hand, the top of the fermentation tank adopts an arc-shaped top cover, the periphery of the top of the fermentation tank is provided with a water collecting tank, and condensed water drops on the top of the fermentation tank flow out of the fermentation tank along the water collecting tank. Finally, the water content of the sludge is reduced to 30-40 percent, and the effect of deep decrement is achieved.
The sludge rapid high-temperature aerobic fermentation technology carries out high-temperature aerobic rapid fermentation and decomposition of sludge by means of the characteristics of direct metabolites or secondary metabolites of microorganisms under aerobic and high-temperature conditions, realizes deep sludge reduction, stabilizes the sludge and further achieves the purpose of resource utilization.
The sludge rapid high-temperature aerobic fermentation technology has the following characteristics:
the fermentation time is short. The fermentation time of the rapid high-temperature aerobic fermentation technology for the sludge is 1-2 days, so that the fermentation time of the sludge is greatly shortened, and the uniformity of sludge dewatering reduction can be effectively improved;
the fermentation temperature is uniform, and the sludge rapid high-temperature aerobic fermentation technology ensures that the temperature of the fermented sludge is kept at 70-90 ℃ under the combined action of boiler heating, mechanical stirring and a biomass microbial inoculum;
the sludge fermentation process is tasteless and small in occupied area, and the traditional sludge fermentation process is large in occupied area, large in odor and serious in dust emission in a fermentation workshop. The rapid high-temperature aerobic fermentation technology for the sludge adopts a fermentation tank as fermentation equipment, the fermentation is sealed, tail gas in the fermentation process is discharged after passing through a deodorization filter tank, and the fermentation process is high-temperature, rapid and odorless.
The rapid high-temperature aerobic fermentation technology of the sludge can effectively reduce the volume of the sludge and reduce the transportation cost; the sludge is decomposed into carbon and nitrogen low-molecular organic matters which are easy to absorb by plants through microorganisms, so that the quality of the organic sludge is improved, the organic matters and nutrient elements in the sludge can be efficiently utilized, the water content of the sludge is reduced to be below 40 percent, and the sludge is a very high-quality fertilizer supplemented with organic matters by soil; the sludge after deep decrement can be used for agriculture and forestry, and the fruits and vegetables have large yield increase range, are green and harmless, are the best choice of organic agriculture, and have wide application prospect.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate exemplary embodiments of the invention and together with the description serve to explain the invention and not to limit the invention.
FIG. 1 is a process flow diagram of the present invention for sludge depth reduction according to one or more embodiments;
FIG. 2 is a schematic diagram of an arc-shaped roof of a thermophilic aerobic fermentation tank according to one or more embodiments of the present invention;
FIG. 3 is an enlarged view of a water collection sump according to one or more embodiments of the present invention.
In the figure: the mutual spacing or size is exaggerated to show the position of each part, and the schematic diagram is only used for illustration;
wherein, 1-outer wall; 2-a first water collection tank; 3-arc structure; 4-a second water collection tank; 5-a drain pipe.
Detailed Description
It is to be understood that the following detailed description is exemplary and is intended to provide further explanation of the invention as claimed. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs.
In a first aspect, the present invention provides an apparatus for deeply reducing sludge in a sewage plant, comprising: the stirring device is arranged in the tank body, the bottom of the tank body is connected with the air blower, and the outer wall of the tank body is provided with a heating coil;
The top cap is used for the lid to fit on jar body, and the inboard of top cap is the arc structure, and the both sides at jar internal wall top all are provided with the water catch bowl, and the bottom slope of water catch bowl sets up, and the lowest of water catch bowl bottom is connected with one side of drain pipe, and the opposite side of drain pipe runs through jar body, lies in outside the jar body to set up down.
In some embodiments, the stirring device comprises a stirring shaft and a stirring paddle, the stirring paddle is mounted at the end of the stirring shaft, the stirring shaft and the stirring paddle are both hollow, a plurality of through holes are formed in the stirring paddle, and the stirring shaft is connected with the air blower through a pipeline.
The other end of the stirring shaft is connected with a motor, and the motor provides the rotating power of the stirring shaft.
Preferably, the stirring shaft at the position connected with the pipeline is divided into two layers, wherein the outer layer is an annular pipe body which is sleeved on the inner layer, the annular pipe body can rotate relative to the inner layer, and the annular pipe body is communicated with the pipeline;
an annular through groove is formed in the inner layer; the pipeline is communicated with the inside of the stirring shaft through the annular through groove.
Further preferably, the annular tube body and the stirring shaft are arranged in a sealing mode. To prevent the air blown into the rotating shaft from escaping.
In some embodiments, the arcuate structures correspond to a central angle of 30-100 °, preferably 60-90 °.
When the central angle is too big, the dribble that steam condenses into flows to the in-process at arc structure both sides, falls back in advance in mud easily under the effect of gravity, and does not have enough long time to flow to the both sides of arc structure, and then leads to the recovery effect to the evaporation water relatively poor, and is lower to the dewatering efficiency of mud.
When the central angle is too small, the diameter of the corresponding tank body is smaller, and the sludge treatment capacity is lower.
In some embodiments the inclination angle of the bottom of the catchment tank is 5-30 °, preferably 10-20 °.
The bottom slope of water catch bowl sets up, can in time derive the water of collecting to the drain pipe.
In some embodiments, the top cover is connected to the deodorizing filter. And tail gas generated in the fermentation process is treated by the deodorization filter and then discharged.
The deodorization filter tank adopts biological deodorization filter tank integrated equipment, the treatment process is mature and reliable, and the treated tail gas is discharged from the air pipe at high altitude.
In a second aspect, the invention provides a high-temperature aerobic fermentation process for sludge, which comprises the following steps: mixing the sludge with high water content, the biomass auxiliary material and the sludge back-mixed material, adding the mixture into a tank body, and adding a biological agent into the tank body;
heating oil is introduced into the heating coil on the side wall of the tank body to heat the sludge and stir the sludge at the same time;
Introducing air into the sludge through an air blower to provide oxygen;
water vapor generated in the sludge fermentation process is condensed at the arc-shaped top cover and is collected at the two sides of the arc-shaped top cover, and the water vapor drips and is collected in the water collecting tank and is discharged outside through the water discharging pipe.
In some embodiments, the mass ratio of the sludge, the biomass adjuvant and the sludge return material is 4-8:1:1, preferably 6:1: 1.
Preferably, the biomass auxiliary material is crushed crop straws or peanut shells.
Preferably, the sludge return mixture is large-particle sludge with the water content of 30-40%.
Further preferably, the particle size of the sludge return material is 5-20 cm.
The adoption of the large-particle sludge return mixing material is beneficial to improving the air permeability of the sludge, and is beneficial to improving the sufficient contact of the sludge, microorganisms and oxygen when air is blown into the sludge return mixing material.
In some embodiments, the biological agent is a yeast, filamentous fungus, bacillus thermophilus, or actinomyces thermophilus.
The air introduced into the sludge can also bring out the moisture in the sludge.
In some embodiments, the temperature of the sludge fermentation is 70-90 ℃, and the fermentation time is 1-2 days.
In some embodiments, the method further comprises the step of conditioning the sludge by using ferric trichloride and cationic polyacrylamide.
Preferably, the adding amount of the ferric trichloride is 1% -3% of the sludge; the dosage of the cationic polyacrylamide is 0.1 to 0.3 percent of the sludge.
The method has the advantages that the ferric trichloride and the cationic polyacrylamide are utilized to temper the sludge, the physical and chemical properties of the sludge are improved by overcoming the electric repulsion action and the hydration action, the affinity with water is reduced, the cohesion is enhanced, the particle size is increased, the dehydration performance of the sludge is improved, the dehydration effect is improved, the volume of the sludge is reduced, and the transportation cost and the subsequent disposal cost are reduced.
Preferably, after conditioning the sludge, the sludge is dewatered by pressing with a high-pressure belt dewaterer. The water content of the sludge is reduced to 60-65%, and the formed solid sludge cake is conveyed to the subsequent stage for high-temperature fermentation and dehydration.
On the basis of sludge wall breaking, the novel high-molecular filter cloth in the high-pressure belt type dehydrator is utilized to squeeze moisture in sludge, bound water in the sludge is converted into free water, the moisture in EPS (extracellular polymeric substance) is released, the cell body is subjected to wall breaking, intracellular moisture is released, sludge reduction is realized, and the moisture content can be further reduced to 60% -65%.
The process sludge is modified after being tempered, dehydration is facilitated, two sections of sludge treatment sections are adopted for reduction, the first section adopts a high-pressure belt type dehydrator, the water content of the sludge is reduced to 60% -65% by utilizing the high-pressure pressing capacity of the novel high-pressure belt type dehydrator, the second section of rapid high-temperature aerobic fermentation technology is adopted, the water content of the sludge can be reduced to 30-40% by only 24-30 h, the period is greatly shortened, and the cost is reduced.
Compared with the sludge with the water content of 80 percent of the factory leaving the conventional sewage plant, the sludge is reduced by 2/3, the reduction degree is obvious, the operation cost is greatly reduced, and the cost of sludge transportation and the risk in the transportation process are reduced.
The high-pressure belt type dehydrator is effectively connected and cooperated with the rapid high-temperature aerobic fermentation technology, so that the water content is reduced, the treatment process is simplified as much as possible, the overall treatment efficiency of the reduction process is improved, and the installation, maintenance and operation costs of equipment are reduced.
The invention is further illustrated by the following figures and examples.
Examples
As shown in fig. 2 and 3, the sludge high temperature aerobic fermentation tank comprises: the stirring device is arranged in the tank body, the bottom of the tank body is connected with the air blower, and the outer wall 1 of the tank body is provided with a heating coil;
the top cap is used for the lid to fit on jar body, and the inboard of top cap is arc structure 3, and the both sides at jar internal wall top all are provided with the water catch bowl, are first water catch bowl 2 and second water catch bowl 4 respectively, and the bottom slope of water catch bowl sets up, and the lowest of water catch bowl bottom is connected with one side of drain pipe 5, and the opposite side of drain pipe 5 runs through jar body, is located outside the jar body to set up down.
The stirring device comprises a stirring shaft and a stirring paddle, the stirring paddle is arranged at the end part of the stirring shaft, the stirring shaft and the stirring paddle are both hollow, a plurality of through holes are arranged on the stirring paddle, and the stirring shaft is connected with an air blower through a pipeline. The other end of the stirring shaft is connected with a motor, and the motor provides rotating power.
The stirring shaft at the position connected with the pipeline is divided into two layers, wherein the outer layer is an annular pipe body which is sleeved on the inner layer, the annular pipe body can rotate relative to the inner layer, and the annular pipe body is communicated with the pipeline; an annular through groove is formed in the inner layer; the pipeline is communicated with the inside of the stirring shaft through the annular through groove. The annular pipe body and the stirring shaft are arranged in a sealing way. To prevent the air blown into the rotating shaft from escaping. By adopting the special structure, the pipeline can be prevented from being wound on the rotating shaft in the rotating process.
The central angle corresponding to the arc-shaped structure is 60 degrees, the inclination angle of the bottom of the water collecting tank is 10 degrees, and the top cover is connected with the deodorization filter tank. And tail gas generated in the fermentation process is treated by the deodorization filter and then discharged. The deodorization filter tank adopts biological deodorization filter tank integrated equipment, the treatment process is mature and reliable, and the treated tail gas is discharged from the air pipe at high altitude. The sludge deep reduction process comprises the following three steps:
1. Quenching and tempering in a sludge conditioning tank;
2. mechanical dehydration is carried out by adopting a novel high-pressure belt type dehydrator;
3. fast high-temperature aerobic fermentation of sludge:
mixing the sludge with high water content, the biomass auxiliary material and the sludge back-mixed material, adding the mixture into a tank body, and adding a biological agent into the tank body; heating oil is introduced into the heating coil on the side wall of the tank body to heat the sludge and stir the sludge at the same time; introducing air into the sludge through an air blower to provide oxygen; water vapor generated in the sludge fermentation process is condensed at the arc-shaped top cover and is collected at the two sides of the arc-shaped top cover, and the water vapor drips and is collected in the water collecting tank and is discharged outside through the water discharging pipe. The fermentation temperature is 80 ℃, and the fermentation time is 48 h.
The parameters and sludge treatment results of examples 1 to 4 are shown in Table 1.
TABLE 1
Figure BDA0003563527930000091
Figure BDA0003563527930000101
Therefore, in practical engineering application, the adding amount of the conditioning agent, the biomass auxiliary material, the back mixing material and the biological agent all affect the water content of the sludge after final fermentation.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (10)

1. The utility model provides a device that is used for sewage plant mud degree of depth decrement which characterized in that: the method comprises the following steps: the stirring device is arranged in the tank body, the bottom of the tank body is connected with the air blower, and the outer wall of the tank body is provided with a heating coil;
the top cap is used for the lid to fit on jar body, and the inboard of top cap is the arc structure, and the both sides at jar internal wall top all are provided with the water catch bowl, and the bottom slope of water catch bowl sets up, and the lowest of water catch bowl bottom is connected with one side of drain pipe, and the opposite side of drain pipe runs through jar body, lies in outside the jar body to set up down.
2. The apparatus for sewage plant sludge depreciation according to claim 1, wherein: the stirring device comprises a stirring shaft and a stirring paddle, the stirring paddle is arranged at the end part of the stirring shaft, the stirring shaft and the stirring paddle are both hollow, a plurality of through holes are formed in the stirring paddle, and the stirring shaft is connected with an air blower through a pipeline.
3. The apparatus for sewage plant sludge depreciation according to claim 1, wherein: the stirring shaft at the position connected with the pipeline is divided into two layers, wherein the outer layer is an annular pipe body which is sleeved on the inner layer, the annular pipe body can rotate relative to the inner layer, and the annular pipe body is communicated with the pipeline;
An annular through groove is formed in the inner layer; the pipeline is communicated with the inside of the stirring shaft through the annular through groove;
further preferably, the annular tube body and the stirring shaft are arranged in a sealing mode.
4. The apparatus for sewage plant sludge depreciation according to claim 1, wherein: the corresponding central angle of the arc-shaped structure is 30-100 degrees, and preferably 60-90 degrees.
5. The apparatus for sewage plant sludge depreciation according to claim 1, wherein: the inclination angle of the bottom of the water collecting tank is 5-30 degrees, and preferably 10-20 degrees.
6. The apparatus for sewage plant sludge depreciation according to claim 1, wherein: the top cover is connected with the deodorization filter tank.
7. A sludge deep reduction process is characterized in that: the method comprises the following steps: mixing the sludge with high water content, the biomass auxiliary material and the sludge back-mixed material, adding the mixture into a tank body, and adding a biological agent into the tank body;
heating oil is introduced into the heating coil on the side wall of the tank body to heat the sludge and stir the sludge at the same time; introducing air into the sludge through an air blower to provide oxygen;
water vapor generated in the sludge fermentation process is condensed at the arc-shaped top cover and is collected at the two sides of the arc-shaped top cover, and the water vapor drips and is collected in the water collecting tank and is discharged outside through the water discharging pipe.
8. The sludge depth-reduction process according to claim 7, wherein: the mass ratio of the sludge, the biomass auxiliary material and the sludge return material is 4-8:1:1, preferably 6:1: 1;
preferably, the biomass auxiliary material is crushed crop straws or peanut shells;
preferably, the sludge return mixture is large-particle sludge with the water content of 30-40%.
Further preferably, the particle size of the sludge return material is 5-20 cm.
9. The sludge depth-reduction process according to claim 8, wherein: the biological agent is saccharomycetes, filamentous fungi, thermophilic bacillus or thermophilic actinomycetes;
preferably, the sludge fermentation temperature is 70-90 ℃, and the fermentation time is 1-2 d.
10. The sludge depth-reduction process according to claim 8, wherein: the method also comprises the process of quenching and tempering the sludge by adopting ferric trichloride and cationic polyacrylamide;
preferably, the adding amount of the ferric trichloride is 1% -3% of the sludge; the dosage of the cationic polyacrylamide is 0.1 to 0.3 percent of the sludge;
preferably, after conditioning the sludge, the sludge is dewatered by pressing with a high-pressure belt dewaterer.
CN202210296446.8A 2022-03-24 2022-03-24 Device and process for deeply reducing sludge in sewage plant Pending CN114890639A (en)

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