CN210117328U - Electroosmosis high-dry dehydration and aerobic fermentation combined sludge treatment system - Google Patents
Electroosmosis high-dry dehydration and aerobic fermentation combined sludge treatment system Download PDFInfo
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- CN210117328U CN210117328U CN201822258954.9U CN201822258954U CN210117328U CN 210117328 U CN210117328 U CN 210117328U CN 201822258954 U CN201822258954 U CN 201822258954U CN 210117328 U CN210117328 U CN 210117328U
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Abstract
The utility model discloses a sludge treatment system that electroosmosis high-dry dehydration and aerobic fermentation unite, include: the electroosmosis sludge high-dry dehydration unit is provided with a sludge inlet, a sewage outlet and a dried sludge outlet; the conveying and metering unit is connected with a sludge inlet arranged on the electroosmosis sludge high-dry dehydration unit; a sewage discharge port of the electroosmosis sludge high-dry dehydration unit is connected with a wastewater backflow unit; a dried sludge outlet of the electroosmosis sludge high-dry dehydration unit is sequentially connected with the fermented material pretreatment unit and the sludge aerobic fermentation unit; the ventilation and deodorization unit is respectively connected with the odor air exhaust space at the arrangement positions of the electroosmosis sludge high-dry dehydration unit and the sludge aerobic fermentation unit. The system can jointly treat the sludge by an electroosmosis sludge high-dry dehydration process and a sludge aerobic fermentation process, and has the advantages of simple technical route operation, maturity, stability, reliability, short construction period, low treatment and operation cost and good treatment effect.
Description
Technical Field
The utility model relates to a sludge treatment field especially relates to a sludge treatment system that electroosmosis high dry dehydration and good oxygen fermentation unite.
Background
At present, the domestic sludge treatment and disposal process comprises aerobic fermentation, land utilization, sanitary landfill, drying incineration, pyrolysis gasification and the like. The aerobic fermentation and land utilization process has the advantages of less investment, low energy consumption and low operating cost, and the organic part can be converted into the components of the soil conditioner. The defects are that the occupied area is large, the treatment period is long, and the treatment period is usually 15-20 days.
SUMMERY OF THE UTILITY MODEL
Based on the problems existing in the prior art, the utility model aims at providing a sludge treatment system that electroosmosis high dry dehydration and aerobic fermentation unite, it does not have the medicament to add, and aerobic fermentation cycle is short, handles the working costs low.
The utility model aims at realizing through the following technical scheme:
the utility model discloses embodiment provides a sludge treatment system that electroosmosis high dry dehydration and good oxygen fermentation unite, include:
the device comprises a conveying and metering unit, an electroosmosis sludge high-dry dehydration unit, a wastewater backflow unit, a fermented material pretreatment unit, a sludge aerobic fermentation unit and a ventilation and deodorization unit; wherein,
the electroosmosis sludge high-dry dehydration unit is provided with a sludge inlet, a sewage outlet and a dried sludge outlet;
the conveying metering unit is connected with a sludge inlet arranged on the electroosmosis sludge high-dry dehydration unit;
the sewage outlet of the electroosmosis sludge high-dry dehydration unit is connected with the wastewater backflow unit;
a dried sludge outlet of the electroosmosis sludge high-dry dehydration unit is sequentially connected with the fermented material pretreatment unit and the sludge aerobic fermentation unit;
the ventilation and deodorization unit is respectively connected with the odor air exhaust space at the arrangement positions of the electroosmosis sludge high-dry dehydration unit and the sludge aerobic fermentation unit.
The embodiment of the utility model provides a sludge treatment method that electroosmosis high dry dehydration and aerobic fermentation unite is still provided, adopt the utility model discloses a sludge treatment system that electroosmosis high dry dehydration and aerobic fermentation unite, including following step:
step 1, metering the treated sludge by a metering unit of the system and then sending the sludge to an electroosmosis sludge high-dry dehydration unit of the system;
step 2, after the sludge enters the electroosmosis sludge high-dry dehydration unit, sequentially performing pumping pressure first coupling electroosmosis dehydration treatment and filter chamber gradient pressing second coupling dehydration treatment to prepare a dehydrated mud cake with the thickness of 15-20 mm, and conveying the dehydrated mud cake to a fermented material pretreatment unit of the system;
step 3, after the dewatered mud cake enters the fermented material pretreatment unit, mixing and stirring the materials to prepare an aerobic fermented mixed material, and conveying the aerobic fermented mixed material to a sludge aerobic fermentation unit of the system;
and 4, performing aerobic fermentation treatment on the aerobic fermentation mixed material in the sludge aerobic fermentation unit, turning the pile in the aerobic fermentation process to perform material oxygen supply, stirring, temperature control and dehumidification, and discharging generated odor after the odor is treated by the ventilation and deodorization unit of the system.
By the above technical scheme the utility model provides a can see out, the embodiment of the utility model provides a sludge treatment system that electroosmosis high dry dehydration and aerobic fermentation unite, its beneficial effect is:
the system for treating sludge by combining the electroosmosis sludge high-dry dehydration process and the sludge aerobic fermentation process is formed by a conveying metering unit, an electroosmosis sludge high-dry dehydration unit, a wastewater backflow unit, a fermentation material pretreatment unit, a sludge aerobic fermentation unit and a ventilation deodorization unit which are organically connected. Because the sludge is electrochemically conditioned, the moisture content of the sludge is reduced to about 60 percent, and then aerobic fermentation is carried out. The technical route has the advantages of simple operation, maturity, stability, reliability, no medicament addition, short aerobic fermentation period and low treatment and operation cost. And electroosmosis sludge drying has a removing effect on ascarid eggs, faecal coliform and heavy metals in sludge, the removal rate of pathogens such as the ascarid eggs, the faecal coliform and the like is more than 99%, and the removal rate of the heavy metals is up to 30%. Can ensure that no secondary pollution is caused to the environment.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly described below, and it is obvious that the drawings in the description below are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to these drawings without creative efforts.
FIG. 1 is a schematic view of a sludge treatment system combining electroosmosis high-dry dewatering and aerobic fermentation provided by an embodiment of the present invention;
FIG. 2 is a diagram illustrating the balance of aerobic fermentation of sludge in the combined sludge treatment process according to an embodiment of the present invention;
FIG. 3 is a schematic diagram illustrating the construction of an electroosmosis high-dry dehydrator according to an embodiment of the present invention;
FIG. 4 is a schematic diagram of a sludge aerobic fermentation unit provided by an embodiment of the present invention;
FIG. 5 is a flow chart of a fixed point deodorization method in a combined sludge treatment method according to an embodiment of the present invention;
in the figure: 100-a metering unit; 200-electroosmosis sludge high-dry dehydration unit; 300-a sludge aerobic fermentation unit; 400-a ventilation deodorizing unit; 1-a sludge bin; 2-shaftless screw conveyor; 3-electroosmosis high-dry dehydrator; 4-mud cake conveying equipment; 5-a mixing system; 6-a belt conveyor; 7-automatic material distribution system; 8-a pile turning system; 10-a central control system; 11-an online real-time detection system; 12-fermentation aeration system; 13-a discharge belt conveyor; 14-a fermentation tank; 15-an aging workshop; 16-processing a belt conveyor; 17-a mesh cage screen; 18-a metering device;
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the specific contents of the present invention, and it should be understood that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiment of the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention. Details not described in the embodiments of the present invention belong to the prior art known to those skilled in the art.
As shown in fig. 1, an embodiment of the present invention provides a sludge treatment system combining electroosmosis high-dry dewatering and aerobic fermentation, including:
the device comprises a conveying and metering unit, an electroosmosis sludge high-dry dehydration unit, a wastewater backflow unit, a fermented material pretreatment unit, a sludge aerobic fermentation unit and a ventilation and deodorization unit; wherein,
the electroosmosis sludge high-dry dehydration unit is provided with a sludge inlet, a sewage outlet and a dried sludge outlet;
the conveying metering unit is connected with a sludge inlet arranged on the electroosmosis sludge high-dry dehydration unit;
the sewage outlet of the electroosmosis sludge high-dry dehydration unit is connected with the wastewater backflow unit;
a dried sludge outlet of the electroosmosis sludge high-dry dehydration unit is sequentially connected with the fermented material pretreatment unit and the sludge aerobic fermentation unit;
the ventilation and deodorization unit is respectively connected with the odor air exhaust space at the arrangement positions of the electroosmosis sludge high-dry dehydration unit and the sludge aerobic fermentation unit.
In the above system, the transportation metering unit includes: a sludge transport vehicle and an all-electronic truck scale (i.e., the metering device 18). Preferably, the metering unit adopts a vehicle weighing system, an SCS series full electronic automobile scale is adopted, the maximum weighing weight is 50 tons, the size of a table top is 3.4m multiplied by 14m, and the division value is 10 Kg. The SCS series electronic truck scale mainly comprises a loader, a weighing display instrument, a weighing sensor, a connecting piece, a limiting device, a junction box and other parts, and is configured with a printer, a large-screen display, a computer, a stabilized voltage power supply and other external equipment.
In the above-mentioned system, the electroosmosis sludge high-dry dehydration unit includes:
the device comprises a sludge bin, a shaftless screw conveyor, a sludge conveying pipeline, a control valve (an electric gate valve), an electro-osmosis sludge high-dry dehydrator, sludge cake conveying equipment and a control device; wherein,
the sludge bin is provided with the sludge inlet;
the outlet of the sludge bin is sequentially connected with the shaftless screw conveyor, the sludge conveying pipeline and the electroosmosis sludge high-dry dehydrator, and the sludge conveying pipeline is provided with the control valve;
the electroosmosis sludge high-dry dehydrator is provided with the sewage discharge port and a mud cake outlet, the mud cake outlet is connected with the mud cake conveying equipment, and the mud cake conveying equipment is provided with the dried sludge outlet;
the control device is respectively electrically connected with the shaftless screw conveyor, the electroosmosis sludge high-dry dehydrator and the mud cake conveying equipment, and can control the shaftless screw conveyor, the electroosmosis sludge high-dry dehydrator and the mud cake conveying equipment to carry out sludge drying dehydration.
As shown in fig. 3, in the above system, the electro-osmotic sludge high-dry dewatering machine includes: the filter chamber cleaning device comprises a frame 210, wherein a filter chamber 220 and a cleaning device are respectively arranged on the frame 210, the cleaning device is arranged on the frame and positioned at the rear end of the filter chamber 220, and the filter chamber can be cleaned;
the drainage device 260 is arranged on the frame and is positioned at the water outlet of the filter chamber 220, so that drainage is facilitated;
the mud cake conveying equipment 4 is arranged below the filter chamber 220 and corresponds to an output mud cake outlet of the filter chamber, so that mud cakes can be conveniently output;
the switching power supply 240 is electrically connected to the electrodes of the filter chamber 220;
the hydraulic device 250 is connected to a hydraulic drive that drives the filter chamber 220.
The electroosmosis sludge high-dry dewatering machine can reduce the water content of sludge from 80% to 60%, and the electroosmosis sludge high-dry dewatering process specifically comprises the following steps: the sludge conveying pipeline is provided with a pneumatic two-way ball valve and a pneumatic T-shaped three-way ball valve. When feeding, the pneumatic two-way ball valve is closed, and the pneumatic T-shaped three-way ball valve is positioned at a mud inlet position; when the device works, the hydraulic system compresses the filter chamber firstly, and then the shaftless screw conveyor 2 conveys the sludge to the filter chamber of the electroosmosis sludge high-dry dewatering machine 3 through a pipeline. Under the pressure of the screw pump 2, the sludge begins to dewater. Continuously feeding the sludge, pumping the sludge into the electroosmosis sludge high-dry dehydrator 3 along with the sludge after the filter chamber is filled with the sludge, continuously increasing the pressure of the electroosmosis sludge high-dry dehydrator, starting a rectification power supply to pump the pressure to couple electroosmosis for the first time when the set pressure is 0.8Mpa, moving sludge particles with negative charges to an anode, moving water carried by positive ions to a cathode, and continuously draining for 2 hours, wherein the sludge feeding amount and the water drainage amount are basically in dynamic balance; when the set time reaches 2 hours, the pneumatic T-shaped three-way ball valve automatically turns to change the sludge inlet position into the sludge return position, the sludge conveyed by the screw rod returns to the sludge storage tank again through the pipeline, and the electroosmosis sludge high-speed dryer 3 does not feed the sludge any more. The hydraulic system continuously extrudes the filter chamber according to the set pressure, sludge particles with negative charges move to the anode and ions with positive charges move to the cathode under the action of an evenly distributed electric field between the anode plate and the cathode plate of the filter chamber and the second coupling action of plate frame gradient squeezing; meanwhile, the negative plate moves towards the anode under the action of plate-and-frame hydraulic power, so that the volume of the sludge chamber is reduced, moisture moving to the negative plate is discharged through the filter cloth and the filter screen, sludge particles are left in the chamber, and finally a dewatered mud cake with the thickness of 15-20 mm is formed; after dehydration, the hydraulic system releases the pressure, the filter chamber is loosened, the filter chambers are pulled open one by one through the pulling plate device, and the dewatered mud cake falls off from the filter chamber and is conveyed away to the belt conveyor (screw conveyor) 4 to complete a working process, and then the next working cycle can be entered. The mud cake is conveyed by a belt conveyor or a U-shaped shaftless screw conveyor 4 arranged at the lower part of the electroosmosis sludge high-dry dehydrator, and the mud cake is conveyed out after the sludge high-dry dehydrator dehydrates. The belt conveyor or the shaftless screw conveyor is connected with 1 main belt conveyor or main shaftless screw conveyor and is sent into the sludge double-shaft paddle mixer 5 together for subsequent aerobic fermentation raw materials.
In the above-mentioned system, fermentation material pretreatment unit includes: at least one production line; preferably, a plurality of production lines can be arranged, and a single work system is adopted. Each production line all includes: a feeding shaftless screw conveyor, a belt conveyor, a double-shaft horizontal paddle type stirrer, a discharging belt conveyor and a loader which are connected in sequence; the device also comprises a dumper arranged corresponding to the loader and connected with the sludge aerobic fermentation unit through the dumper. The total area of the pretreatment workshop provided with the fermentation material pretreatment unit can comprise the occupied area of the electroosmosis sludge high-dry dehydration unit, the occupied area of a temporary storage area of dehydrated sludge and the occupied area of an arrangement area of fermentation material mixing equipment.
In the system, the sludge aerobic fermentation unit adopts a groove type batch processing aeration-free aerobic fermentation system provided with a chain plate type pile turning machine. Specifically, the sludge aerobic fermentation unit is arranged in a fermentation workshop, and the stack body is turned through the arranged high-efficiency chain plate type stack turning machine 8 so as to supply oxygen, control temperature and dehumidify. Feeding and discharging materials in batches, feeding materials at one end of the fermentation tank 14 each time, and moving the materials to the other end of the fermentation tank 14 through turning operation of the high-efficiency chain plate type turning and throwing machine 8 on the materials; feeding a batch of materials at the beginning for the second time, repeating the process until the fermentation period is finished, and discharging the finished product materials from the other end of the fermentation tank; the turner also performs the operations of oxygenation, crushing and stirring on the materials while carrying the materials.
Preferably, the sludge aerobic fermentation unit adopts a high-temperature aerobic rapid fermentation technology, and can adopt high-temperature aerobic rapid fermentation comprising the following subsystems: the system comprises: the system comprises a material mixing system 5, an automatic material distribution system 7, a fermentation tank 14, a pile turning system 8, a fermentation aeration system 12, a central control system 10, an online real-time detection system 11, a resource reprocessing system, a processing belt conveyor 16, a mesh cage screen 17 and the like; the municipal domestic sludge, the special decomposed microbial inoculum and the backfill auxiliary material are conveyed to a mixing system by using the belt conveyor 7 and the metering device, and the materials conveyed to the mixing system are fully mixed and then conveyed to the high-temperature aerobic fermentation tank 14 through the conveying system to be subjected to high-temperature aerobic fermentation, thorough decomposition and curing and harmless treatment. Based on a real-time online monitoring system, fermentation parameters such as temperature, suitable humidity, dissolved oxygen and the like are monitored, and the automatic aeration device and the wireless control pile turning system are regulated and controlled in real time through the central control system 10 to perform process control on the fermented sludge. After 15 days of high-temperature aerobic fermentation, the materials are sent to an aging workshop 15 to be subjected to secondary 15-20 days of after-decomposition, so that the harmless treatment of the municipal sludge is thoroughly realized. The primary nutrient soil generated by the harmless treatment of the municipal domestic sludge is subjected to secondary processing by a resource reprocessing system to produce organic fertilizers for gardens and forests and fruits. And the harmlessness, reduction treatment and resource utilization of the municipal domestic sludge are completed.
Specifically, the main process parameters of the sludge aerobic fermentation unit in the fermentation workshop are as follows:
a. the main process is related:
and (3) fermentation period: 21 days
Dewatering sludge: 300t/d, water content 80%
Returning a mixed material: 11t/d, water content 40%
Straw materials: 1.7t/d, water content 15%
Mixing materials: 162.7t/d, water content of 62 percent and C/N of 20
Finished product clinker aggregate: 99.7t/d, water content 40%
Fermentation product: 88.7t/d, 40 percent of water content
Effective fermentation temperature control range: 55-65 DEG C
Pile turning control: the early stage of fermentation is mainly controlled by temperature and oxygen supply, and the later stage is mainly controlled by oxygen supply and dehumidification
Pile turning frequency: 1-2 d/time in the early fermentation period and 2-3 d/time in the later fermentation period
b. The equipment is related:
the number of the chain plate type turning machines 8 is as follows: 2 pieces (one stage to one piece)
Single chain plate type turning machine 8 capacity: 350m3/h
8 power of single chain plate type turning machine: 30kw
The number of matched transitional machines 11: 2 (one stage for one).
The wastewater backflow unit can uniformly collect and treat the desorption water in the sludge, collect the desorption water into a newly-built wastewater treatment tank in a plant area, discharge the wastewater after biochemical standard-reaching treatment, and avoid causing new pollution.
Further, the above system further comprises: and the post-treatment unit is connected with the output end of the sludge aerobic fermentation unit and consists of a processing belt conveyor 16, a mesh cage sieve 17, a quantitative packaging machine, a loader and a dumper which are connected in sequence. The fermented clinker can be subjected to screening, back mixing, crushing, bagging and other treatment. Further, the post-processing unit may be located in a post-processing plant.
In the above system, the ventilation deodorization unit 400 can be set at a fixed point, and can deodorize the part of the sludge dewatering process where the odor source is concentrated at a fixed point (see fig. 5 in the flow), so as to reduce the influence of the odor on the environment to the maximum extent. Specifically, the method has the characteristics of generating the sludge electroosmosis high-pressure dehydration odor, and the deodorization process is a treatment technology of 'water film dehydrator + low-temperature plasma cracking oxidation'.
The ventilation deodorization unit 400 can also deodorize the aerobic fermentation of the sludge, and the deodorization process flow (see fig. 5) is as follows: collecting a large amount of steam odor generated in the aerobic fermentation process of sludge in a fixed area, then feeding the collected steam odor into a biological filter, and degrading pollutants by a microbial bed to generate CO2、H2O、N2And a small amount of other small molecular substances, so that the odor degree of the waste gas is obviously reduced. The treated gas reaching the standard is discharged from a chimney with the length of 15 m.
The embodiment of the utility model provides a still provide a sludge treatment method that electroosmosis high dry dehydration and aerobic fermentation unite, adopt foretell sludge treatment system that electroosmosis high dry dehydration and aerobic fermentation unite, include the following step (refer to fig. 2):
step 1, metering the treated sludge by a metering unit of the system and then sending the sludge to an electroosmosis sludge high-dry dehydration unit of the system;
step 2, after the sludge enters the electroosmosis sludge high-dry dehydration unit, sequentially performing pumping pressure first coupling electroosmosis dehydration treatment and filter chamber gradient pressing second coupling dehydration treatment to prepare a dehydrated mud cake with the thickness of 15-20 mm, and conveying the dehydrated mud cake to a fermented material pretreatment unit of the system;
step 3, after the dewatered mud cake enters the fermented material pretreatment unit, mixing and stirring the materials to prepare an aerobic fermented mixed material, and conveying the aerobic fermented mixed material to a sludge aerobic fermentation unit of the system;
step 4, performing aerobic fermentation treatment on the aerobic fermentation mixed material in the sludge aerobic fermentation unit, and turning over the material to supply oxygen, stir, control the temperature and remove the moisture in the aerobic fermentation process;
and odor generated by the electroosmosis sludge high-dry dehydration unit and the sludge aerobic fermentation unit is deodorized and discharged through a ventilation deodorization unit of the system.
The treatment method of the utility model carries out electrochemical conditioning on the sludge, reduces the moisture content of the sludge to about 60 percent by adopting high-pressure plate frame pressing, and then carries out aerobic fermentation. The technical route has the advantages of simple operation, maturity, stability, reliability, short construction period and low treatment and operation cost. And electroosmosis sludge drying has a removing effect on ascarid eggs, faecal coliform and heavy metals in sludge, the removal rate of pathogens such as the ascarid eggs, the faecal coliform and the like is more than 99%, and the removal rate of the heavy metals is up to 30%. Can ensure that no secondary pollution is caused to the environment.
The utility model discloses a sludge treatment system that electroosmosis mud high-dry dehydration and good oxygen fermentation unite can realize the high-dry dehydration of electroosmosis mud + good oxygen fermentation and unite the processing mud, and this system can the high dry dehydration technological advantage of full play electroosmosis mud, at first with the high dry dehydration unit of electroosmosis mud to municipal sludge, carry out preliminary dehydration to moisture content 50% ~ 55%, need not add any chemical agent in addition, does not have any negative effects to follow-up sludge fermentation. The mud cake after the high-dry dehydration treatment of the sludge has the temperature of 60-70 ℃ and the water content meets the initial requirement of the temperature of a pile body of a subsequent aerobic fermentation treatment technology of the sludge. The electroosmosis process can effectively kill pathogenic microorganisms in the sludge, the killing rate is over 99 percent, and the electroosmosis process is obviously helpful for the sterilization process of subsequent fermentation. The temperature of the stack body is 70 ℃, and residual harmful bacteria and pathogens in the sludge can be continuously and rapidly killed at high temperature. As the porosity between the mud cake piles is high, the aeration is sufficient, and the mud cake can be quickly dewatered. The sludge fermentation process can cancel the sludge back-mixing process flow, and the operation cost of the whole sludge treatment is reduced. The dewatering time is reduced, the aerobic fermentation period is shortened, and the whole system occupies small area. The aims of reduction and harmlessness of sludge treatment are realized. The humus can be used as a landscaping substrate, so that the soil is improved, and the resource utilization of sludge is realized. The system basically achieves the aims of sludge reduction and resource utilization. The method has the advantages of adopting rapid aerobic fermentation: a. the fermentation time is short, and the fermentation period is 7-14 days. b. The floor area is only 1/5-1/2 of the same technology. c. The investment and operation cost is low: high automation and mechanization degree, and power and manpower saving. e. The operation is simple and convenient, and the computer control can be realized. f. The operation is stable: the fermentation process is not affected by the outside low temperature, and the production can be carried out annually. g. The technology is mature and stable. h. And (3) environmental safety: no secondary pollution such as odor, waste liquid and the like, and no environmental pollution caused by fertilizer application.
The embodiments of the present invention will be described in further detail below.
As shown in fig. 1 to 5, the embodiment of the present invention provides a sludge treatment system combining electroosmosis high-dry dewatering and aerobic fermentation, wherein fig. 1 is a sludge treatment system combining electroosmosis high-dry dewatering and aerobic fermentation, fig. 2 is a combined process flow diagram of electroosmosis aerobic fermentation, fig. 3 is a high-temperature aerobic fermentation system, fig. 4 is electroosmosis high-dry dewatering equipment, fig. 5 is a ventilation deodorization unit, and the combined treatment of sludge by electroosmosis high-dry dewatering and aerobic fermentation can be achieved. The specific processing flow of the system is as follows (see fig. 2);
sludge of a sewage treatment plant or external sludge is fed into a sludge bin 1, the sludge bin 1 is connected with a shaftless screw conveyor 2 (the shaftless screw conveyor can also be adopted), the shaftless screw conveyor 2 can pressurize the sludge to 1.2Mpa, the sludge is pressed into a filter chamber of an electroosmosis sludge high-dry dehydration unit 3 by a sludge conveying pipeline of the shaftless screw conveyor 2 through a control valve (comprising a pneumatic two-way ball valve and a pneumatic T-shaped three-way ball valve, the pneumatic two-way ball valve is closed during feeding, and the pneumatic T-shaped three-way ball valve is positioned at a sludge inlet position), pressure is provided by a high-pressure oil pump in the filter chamber, an oil cylinder is enabled to press a steel high-pressure elastic filter plate component of the filter chamber, and a plate electrode, a steel high-pressure elastic filter plate and filter cloth form a sludge;
in the early stage, sludge with the water content of 80% is continuously fed by the pressure of the shaftless screw conveyor 2, and water is continuously discharged by filter pressing of the mud cakes under the feeding pressure of 0.8-1.2 MPa to obtain the mud cakes with the water content of about 70%; then close the 2 power supplies of shaftless screw conveyer of feeding, gas accuse feeding three-way valve self-closing carries out filter cake electroosmosis primary coupling pump sending and secondary electroosmosis coupling and squeezes the dehydration operation: starting the hydraulic device again, and enabling an oil cylinder piston rod of the hydraulic device to tightly push the pressing plate again to advance gradually; the pressure spring of each filtering unit contracts, and the water channel core plate of each filtering unit is pushed to the bottom surface of the steel high-pressure elastic filter plate along with the contraction of the pressure spring of each filtering unit; thereby changing the volume of the filter chamber, carrying out squeezing operation on the electro-osmosis filtered cake, and filtering out redundant water to obtain a mud cake with the water content of about 60%;
the high-temperature aerobic rapid fermentation technology figure 3 is mainly divided into eight subsystems: the automatic material distribution system 6, the belt conveyor 13, the material mixing system 5, the fermentation aeration system 12, the pile turning system 8, the central control system 10, the online real-time detection system 11, the deodorization system 9 and the resource reprocessing 17 system. The municipal domestic sludge, the special decomposed microbial inoculum and the backfill auxiliary materials are conveyed to a mixing system by utilizing a conveying system 13 and a metering device 18, and the materials conveyed to a mixer are fully mixed and then conveyed to a high-temperature aerobic fermentation tank 14 by a conveying system to be subjected to high-temperature aerobic fermentation, thorough decomposition and curing and harmless treatment. Based on a real-time online monitoring system, fermentation parameters such as temperature, suitable humidity, dissolved oxygen and the like are monitored, and the process control is carried out on the fermented sludge through a central control system 10, a real-time regulation and control automatic aeration device and a wireless control pile turning system. After 15 days of high-temperature aerobic fermentation, the materials are sent to an aging workshop 15 to be subjected to secondary 15-20 days of after-decomposition, so that the harmless treatment of the municipal sludge is thoroughly realized. The primary nutrient soil generated by the harmless treatment of the municipal domestic sludge is subjected to secondary processing by a resource reprocessing system to produce organic fertilizers for gardens and forests and fruits. And the harmless treatment reduction and resource utilization of the municipal domestic sludge are completed.
The utility model discloses a system has following advantage at least: the system highlights the aims of reduction, stabilization, harmlessness and recycling of sludge treatment, fully embodies the principle of recycling and meets the requirement of development cycle economy advocated by the state; the technical route may become the market mainstream for guiding the sludge treatment in China in the future. The technology has the following specific advantages:
and (3) reduction: the electro-osmosis technology can reduce the water content of the sludge to below 50 percent, has obvious reduction effect, and can reduce equipment investment and occupied area required by subsequent fermentation;
harmlessness: in the electroosmosis process, the method has very obvious killing effect on faecal coliform, parasitic ova and the like in the sludge, the killing rate is as high as 99.99 percent, and the harmless purpose of sludge treatment and subsequent fermentation is realized;
the addition amount of auxiliary materials is small: the sludge cake with the water content of 50 percent has a large amount of loose spaces on the surface and inside, the specific surface area is large, more oxygen is easy to reserve, the aeration quantity is reduced, the pile turning frequency is reduced, and the energy is saved and the consumption is reduced;
no chemical agent is needed: in the fermentation process, the optimal water content of the sludge is kept at 50-60%, the water content of the sludge is difficult to reduce to 60% by the traditional plate-and-frame dehydration technology, and agents which are not beneficial to subsequent fermentation treatment, such as PAC, ferric trichloride, quicklime and the like, need to be added; the electroosmosis dehydration technology has the advantages that the moisture content of wet sludge can be reduced to 50% -60% under the condition of not adding any chemical agent, the adverse effect of the chemical agent on fermentation microorganisms is avoided, meanwhile, the reduction of the moisture content can quickly raise the temperature in the sludge fermentation process, and the time for entering a high-temperature period is shortened;
the porosity is increased: the porosity of the sludge after electroosmosis treatment is greatly increased compared with that before dehydration, favorable conditions are created for the oxygenation process in the subsequent fermentation process, and the contact area of the fermentation microorganisms and oxygen is increased, so that the sludge is more easily decomposed.
Aiming at the municipal domestic sludge, the municipal domestic sludge is comprehensively treated according to a mature sludge rapid high-temperature decomposition technology. The technology is based on a high-temperature aerobic fermentation principle, and by controlling proper external conditions, the beneficial flora is exerted to decompose organic matters in the sludge and release energy, so that the harmful bacteria and viruses are killed, the content of active ingredients and microbial indexes of final products meet the agricultural standard, and the sludge is finally recycled.
The above description is only for the preferred embodiment of the present invention, but the protection scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are all covered by the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (6)
1. An electroosmosis high-dry dehydration and aerobic fermentation combined sludge treatment system is characterized by comprising:
the device comprises a conveying and metering unit, an electroosmosis sludge high-dry dehydration unit, a wastewater backflow unit, a fermented material pretreatment unit, a sludge aerobic fermentation unit and a ventilation and deodorization unit; wherein,
the electroosmosis sludge high-dry dehydration unit is provided with a sludge inlet, a sewage outlet and a dried sludge outlet;
the conveying metering unit is connected with a sludge inlet arranged on the electroosmosis sludge high-dry dehydration unit;
the sewage outlet of the electroosmosis sludge high-dry dehydration unit is connected with the wastewater backflow unit;
a dried sludge outlet of the electroosmosis sludge high-dry dehydration unit is sequentially connected with the fermented material pretreatment unit and the sludge aerobic fermentation unit;
the ventilation and deodorization unit is respectively connected with the odor air exhaust space at the arrangement positions of the electroosmosis sludge high-dry dehydration unit and the sludge aerobic fermentation unit.
2. The electro-osmotic high-dry dewatering and aerobic fermentation combined sludge treatment system of claim 1 wherein the transport metering unit comprises: a sludge transfer cart and an all-electronic truck scale.
3. The sludge treatment system combining electro-osmotic high-dry dewatering and aerobic fermentation according to claim 1 or 2, wherein the electro-osmotic sludge high-dry dewatering unit comprises:
the device comprises a sludge bin, a shaftless screw conveyor, a sludge conveying pipeline, a control valve, an electroosmosis sludge high-dry dehydrator, sludge cake conveying equipment and a control device; wherein,
the sludge bin is provided with the sludge inlet;
the outlet of the sludge bin is sequentially connected with the shaftless screw conveyor, the sludge conveying pipeline and the electroosmosis sludge high-dry dehydrator, and the sludge conveying pipeline is provided with the control valve;
the electroosmosis sludge high-dry dehydrator is provided with the sewage discharge port and a mud cake outlet, the mud cake outlet is connected with the mud cake conveying equipment, and the mud cake conveying equipment is provided with the dried sludge outlet;
the control device is respectively electrically connected with the shaftless screw conveyor, the electroosmosis sludge high-dry dehydrator and the mud cake conveying equipment, and can control the shaftless screw conveyor, the electroosmosis sludge high-dry dehydrator and the mud cake conveying equipment to carry out sludge drying dehydration.
4. The sludge treatment system combining electro-osmotic high-dry dewatering and aerobic fermentation according to claim 3, wherein the electro-osmotic sludge high-dry dewatering machine comprises: the cleaning device is arranged on the frame and is positioned at the rear end of the filtering chamber;
the drainage device is arranged on the frame and is positioned at a water outlet of the filter chamber;
the mud cake conveying equipment is arranged below the filter chamber and corresponds to an output mud cake outlet of the filter chamber;
the switching power supply is electrically connected with the electrode of the filter chamber;
the hydraulic device is connected with a hydraulic driving end for driving the filter chamber.
5. The sludge treatment system combining electro-osmotic highly-dry dewatering and aerobic fermentation according to claim 1 or 2, wherein the fermented material pretreatment unit comprises: at least one production line;
each production line all includes: a feeding shaftless screw conveyor, a belt conveyor, a double-shaft horizontal paddle type stirrer, a discharging shaftless screw conveyor and a loader which are connected in sequence; the device also comprises a dumper arranged corresponding to the loader and connected with the sludge aerobic fermentation unit through the dumper.
6. The sludge treatment system combining electroosmosis high-dry dewatering and aerobic fermentation according to claim 1 or 2, wherein the sludge aerobic fermentation unit adopts a tank type batch non-ventilation aerobic fermentation system provided with a chain plate type pile turning machine.
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| CN114538744A (en) * | 2022-03-18 | 2022-05-27 | 苏州佳爱丽环保科技有限公司 | Integrated dehydration process based on ultrahigh-dryness sludge extrusion device |
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