CN215559973U - Ventilation system for film-covered compost - Google Patents

Abstract

The application provides a ventilation system is used to tectorial membrane compost, includes: the fermentation device comprises a fermentation unit, a plurality of ventilation pipes, a fan and a controller, wherein the fermentation unit comprises a fermentation tank and a nano film, and the nano film covers the fermentation tank to form a fermentation space; a plurality of ventilation pipes are arranged in the fermentation space; the fan is connected with the ventilation pipe; the controller is connected with the fan and used for controlling the air quantity of the fan. The application provides a ventilation system is used to tectorial membrane compost, because fermentation unit adopts fermentation tank and nanometer membrane to combine to form the fermentation space, carry out the good oxygen compost fermentation of material, set up the ventilation pipe in the fermentation space, it fills oxygen for the fermentation space to control the fan through the controller, the problem that current good oxygen compost adopted natural draft to cause the stink to leak has been overcome, the amount of wind of the steerable fan of controller, the operating time period etc., need not manual operation, degree of automation is high, avoid the stink to leak, the environmental protection, the quality of compost fermentation fertilizer has been improved.

Description

Ventilation system for film-covered compost

Technical Field

The application belongs to the technical field of fermentation processes, and particularly relates to a ventilation system for film-covered compost.

Background

Aerobic composting fermentation is one of important ways to solve the problem of pollution of livestock and poultry manure and realize resource utilization of the livestock and poultry manure. At present, aerobic composting fermentation adopts slot type composting fermentation or tank type, box type and tower type fermentation, and oxygen is supplemented for the fermentation process by adopting a mode of natural ventilation of a ventilation opening, but odor generated in the fermentation process leaks out through the ventilation opening, a large amount of odor is discharged, so that the environment is polluted, and the nitrogen content of organic fertilizers can be reduced.

SUMMERY OF THE UTILITY MODEL

The embodiment of the application provides ventilation system for tectorial membrane compost to solve current aerobic composting fermentation and adopt natural draft to cause the problem that stink leaks.

In a first aspect, an embodiment of the present application provides a ventilation system for tectorial membrane composting, including:

the fermentation unit comprises a fermentation tank and a nano film, and the nano film covers the fermentation tank to form a fermentation space;

a plurality of ventilation pipes arranged in the fermentation space;

the fan is connected with the ventilation pipe;

and the controller is connected with the fan and used for controlling the air quantity of the fan.

Optionally, the ventilation pipe set up in the bottom of fermentation vat, the one end of ventilation pipe is the air intake, and the other end is the drain, be provided with a plurality of air outlets on the pipe shaft of ventilation pipe, air intake connection the fan, the drain is used for discharging the sewage that produces in the fermentation process.

Optionally, the air outlets are distributed in at least two rows along the pipe body of the ventilation pipe, and the air outlets in two adjacent rows are arranged in a staggered manner.

Optionally, a first switch piece is arranged between the air inlet of the ventilation pipe and the fan, a second switch piece is arranged at a sewage discharge port of the ventilation pipe, and the first switch piece and the second switch piece are respectively connected with the controller.

Optionally, a plurality of pipe grooves are formed in the bottom of the fermentation tank, the ventilation pipe is installed in the pipe grooves, and the air outlet is located at the notch of the pipe grooves.

Optionally, a padding layer is arranged at the bottom of the fermentation tank, and the upper surface of the padding layer is higher than the air outlet.

Optionally, the fermentation tank further comprises a first collecting pipe, the first collecting pipe is arranged outside the fermentation tank, and the first collecting pipe is connected with the ventilation pipes and the fan.

Optionally, a first switch is arranged between the first collecting pipe and the fan;

or a first switch piece is arranged between each ventilation pipe and the first collecting pipe.

Optionally, the fermentation tank further comprises a second collecting pipe, wherein the drain outlets of the plurality of ventilation pipes are connected with the second collecting pipe, the second collecting pipe is provided with a second switch, and the second collecting pipe is used for discharging sewage generated in the fermentation process.

Optionally, the bottom of fermentation vat is provided with the slope of predetermineeing the angle, the drain set up in the position department that the bottom slope is the lowest.

The ventilation system is used to tectorial membrane compost that this application embodiment provided, because fermentation unit adopts fermentation tank and nanometer membrane to combine to form the fermentation space, carry out the good oxygen compost fermentation of material, set up the ventilation pipe in the fermentation space, it fills oxygen for the fermentation space to control the fan through the controller, the problem that current good oxygen compost adopted natural draft to cause the stink to leak has been overcome, the amount of wind of the steerable fan of controller, the operating time period etc., need not manual operation, degree of automation is high, avoid the stink to leak, the environmental protection, the quality of compost fermentation fertilizer has been improved.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings used in the description of the embodiments will be briefly described below. It is obvious that the drawings in the following description are only some embodiments of the application, and that other drawings can be derived from these drawings by a person skilled in the art without inventive effort.

For a more complete understanding of the present application and its advantages, reference is now made to the following descriptions taken in conjunction with the accompanying drawings. Wherein like reference numerals refer to like parts in the following description.

Fig. 1 is a schematic structural view of a ventilation system for composting a mulching film according to an embodiment of the present application.

FIG. 2 is a structural schematic diagram of a fermentation tank in the form one in the ventilation system for composting with mulching film provided in the embodiment of the present application.

FIG. 3 is a schematic structural diagram of a fermentation tank in the first form according to the embodiment of the present invention.

FIG. 4 is a structural schematic diagram of a fermentation tank in the ventilation system for composting with mulching film according to the embodiment of the present application.

FIG. 5 is a structural schematic diagram of a fermentation tank in the form two provided in the embodiment of the present application.

Fig. 6 is a partially enlarged view of a portion a in fig. 2.

Fig. 7 is a schematic view of a sealing structure provided in an embodiment of the present application.

Fig. 8 is a partial enlarged view of fig. 5 at B.

Fig. 9 is a partially enlarged view at C in fig. 2.

FIG. 10 is a schematic structural diagram of a fermentation tank provided in the embodiments of the present application.

Fig. 11 is a schematic structural diagram of a vent pipe provided in an embodiment of the present application.

FIG. 12 is a schematic view of the arrangement of ventilation pipes in the form of a fermentation tank according to the embodiment of the present invention.

FIG. 13 is a schematic view of the arrangement of ventilation pipes in the fermentation tank of the second embodiment of the present invention.

Detailed Description

The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. It is to be understood that the embodiments described are only a few embodiments of the present application and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

The embodiment of the application provides ventilation system for tectorial membrane compost to solve current aerobic composting fermentation and adopt natural draft to cause the problem that stink leaks. The following description will be made with reference to the accompanying drawings.

The ventilation system for the film-covered compost provided by the embodiment of the application can be applied to a compost fermentation system, exemplarily, the compost fermentation system comprises a control system and the ventilation system for the film-covered compost, and the compost fermentation system can be used for treating various livestock and poultry excrement, crop straws, kitchen garbage, sludge waste, cake dregs, agricultural and forestry waste, agricultural product processing waste and other organic raw materials.

In order to more clearly explain the structure of the ventilation system for compost covered with film, the ventilation system for compost covered with film will be described below with reference to the accompanying drawings.

Referring to fig. 1, fig. 1 is a schematic structural diagram of a fermentation tank provided in an embodiment of the present application.

A ventilation system for film-covered compost comprises a fermentation unit, a fan 20 and a controller, wherein the fermentation unit comprises a fermentation tank 1 and a nano film 31, the nano film 31 covers the fermentation tank 1 to form a fermentation space, a plurality of ventilation pipes 2 are arranged in the fermentation space, the ventilation pipes 2 are connected with the fan 20, the controller is connected with the fan 20, and the controller is used for controlling the air volume of the fan 20.

In some embodiments, referring to fig. 11, fig. 12 and fig. 13, the ventilation pipe 2 is disposed at the bottom of the fermentation tank 1, one end of the ventilation pipe 2 is an air inlet, another is a sewage outlet, a plurality of air outlets 21 are disposed on a pipe body of the ventilation pipe 2, the air inlet is connected with the fan 20, the sewage outlet is used for being connected with the sewage collecting tank 5, sewage generated by fermentation in the fermentation tank 1 flows into the sewage collecting tank 5 through the ventilation pipe 2, the sewage is collected and treated uniformly, the fan 20 and the sewage collecting tank 5 are respectively disposed at two ends of the ventilation pipe 2, when the fan 20 discharges oxygen, a certain pressure is applied to the ventilation pipe 2, so that the sewage is discharged, and the ventilation pipe 2 has functions of ventilation and sewage discharge.

In some embodiments, referring to fig. 11, the ventilation pipe 2 is a PE pipe, two rows of air outlets 21 are formed on the ventilation pipe 2, the air outlets 21 that are not discharged are arranged at equal intervals, and the air outlets 21 of two connected rows are arranged in a staggered manner. Guarantee the homogeneity of air-out, when partial air outlet 21 is blockked up, still can guarantee the air-out effect.

In some embodiments, referring to fig. 8, 12 and 13, a first switch 22 is arranged between the air inlet of the ventilation pipe 2 and the fan 20, a second switch 23 is arranged at the sewage outlet of the ventilation pipe 2, the first switch 22 and the second switch 23 are respectively connected with the controller, the controller controls the second switch 23 to be closed in the early stage of fermentation, and the controller controls the second switch 23 to be opened in the late stage of fermentation every day to prevent sewage from blocking the ventilation pipe 2 and affecting the ventilation effect.

In some embodiments, referring to fig. 10, a pipe groove 101 is formed in the bottom of the tank body 10, the ventilation pipe 2 is laid in the corresponding pipe groove 101, the air outlet 21 is located at the groove opening of the pipe groove 101, the pipe groove 101 is formed, and the ventilation pipe 2 is arranged in the pipe groove, so that the flatness of the bottom of the tank body 10 is guaranteed, feeding and discharging in the composting process are facilitated, and the ventilation pipe 2 is protected. It will be appreciated that the ventilation tube 2 may also be suspended if only the problem of ventilation is addressed.

In some embodiments, the bottom of the fermentation tank 1 is provided with a padding layer, the upper surface of the padding layer is higher than the air outlet 21, the padding layer is formed by laying fermented rotten clinker or other fluffy materials, the padding layer can be laid on the whole bottom or only laid above the ventilation pipe 2, and the air outlet 21 is effectively prevented from being blocked.

In some embodiments, referring to fig. 12 and 13, the ventilation system for film-covered composting further comprises a first collecting pipe 24, the first collecting pipe 24 is connected with a plurality of ventilation pipes 2 and the fan 20, the first collecting pipe 24 is arranged outside the fermentation tank 1, and the air inlets of the ventilation pipes 2 extend out of the fermentation tank 1 and are connected with the first collecting pipe 24. Draw the air intake from fermentation tank 1 through first header 24, set up fan 20 outside fermentation tank 1, avoid the space waste in fermentation tank 1, keep away from the moist heat environment of fermentation with fan 20 simultaneously, be favorable to prolonging fan 20's life.

In some embodiments, referring to fig. 12 and 13, a first switching element 22 is disposed between the first collecting pipe 24 and the fan 20, and the first switching element 22 controls the conduction and the cut-off of the first collecting pipe 24, so as to control the conduction and the cut-off of all the ventilation pipes 2 at the same time, thereby facilitating the control and providing sufficient oxygen for the fermentation of the material.

In some embodiments, referring to fig. 12 and 13, a first switch 22 is disposed between the ventilation pipe 2 and the first collecting pipe 24, an air inlet of the ventilation pipe 2 is located outside the fermentation tank 1, the first switch 22 is disposed outside the fermentation tank 1, and the controller controls certain first switches 22 to operate, so as to achieve the on and off of the corresponding ventilation pipe 2, and the fermentation tank is suitable for places with large fermentation space, and is used for batch material stacking and batch fermentation, so that the space in the fermentation tank 1 is fully utilized, and the fermentation efficiency is improved.

It can be understood that the first switch member 22 is a check valve to prevent the odor generated by the fermentation of the stack in the fermentation space from leaking.

As can be understood, the fan 20 adopts a hot air blower to increase the oxygen supply temperature and accelerate the fermentation.

In some embodiments, the ventilation system for film-covered composting further comprises a second collecting pipe 25, the second collecting pipe 25 is communicated with the sewage discharge port of the ventilation pipe 2 and the sewage collecting tank 5, a second switch 23 is arranged on the second collecting pipe 25, the controller controls the second switch 23 to act, the ventilation pipe 2 is switched on or off, and the second collecting pipe 25 collects sewage generated by the ventilation pipes 2 and conveys the sewage to the sewage collecting tank 5 in a unified mode.

In some embodiments, the bottom of the fermentation tank 1 is provided with a slope with a preset angle, the sewage draining outlet is arranged at the position with the lowest slope of the bottom, and the ventilation pipe 2 arranged at the bottom of the fermentation tank 1 is also obliquely arranged and inclines from the air inlet side to the sewage draining outlet side, so that the sewage in the ventilation pipe 2 can be drained conveniently.

In some embodiments, as described with reference to fig. 2, 3 and 12, the fermentation tank 1 is in the form of a first tank body 10, which is enclosed by a bottom 100 and three side walls 102, and an opening 12 is formed at one side of the tank body 10, and the opening 12 is a feeding hole and a discharging hole. Under this kind of structure, ventilation pipe 2 is arranged along the plane interval that perpendicular to opening 12 belonged to, and the air intake of vent 2 is located discharge gate one side, and the air outlet 21 of ventilation pipe 2 is located feed inlet one side, and the cell body 10 bottom has certain slope from discharge gate side direction feed inlet side, generally sets up 5 per mill's slope, is favorable to the evacuation of sewage in the ventilation pipe 2, and the height of second collection pipe 25 is also less than the height of cell body 10 feed inlet one side moreover, guarantees that sewage drainage is smooth and easy.

In some embodiments, referring to fig. 4 and 5, the fermentation tank 1 is in the form of a second tank body 10, the tank body 10 is enclosed by a bottom 100 and two side walls 102, the two side walls 102 are arranged in parallel, two ends of the tank body 10 form openings 12, and the frame body 30 is spanned on the two side walls 102, wherein one opening 12 is a feeding hole, and the other opening 12 is a discharging hole. Under this kind of structure, ventilation pipe 2 is along the plane interval arrangement that is on a parallel with lateral wall 102 place, and the cell body 10 outside sets up first collection pipe 24, and the air intake of ventilation pipe 2 extends lateral wall 102 and links to each other with first collection pipe 24, and sets up a switch spare on each ventilation pipe 2, when carrying out batch fermentation operation, builds up the heap in proper order to the feed inlet from discharge gate one side, and the first switch spare 22 of ventilation pipe 2 of same batch windrow below moves simultaneously, and the rational utilization fermentation space improves composting efficiency.

It is understood that the fermentation tank 1 is in the first form or the second form, and can be determined according to the actual site size.

It is understood that the tank 10 may be constructed of concrete or may be constructed of other sealing materials. When the trough body 10 is constructed by concrete, the foundation site is hardened first, the side walls are piled up, and the frame body 30 is fixed by embedding or fixing by anchor bolts.

It will be appreciated that the tank 10 may be of an underground tank, a ground tank or a semi-ground tank construction.

In some embodiments, referring to fig. 1 and 2, the fermentation tank 1 of the fermentation unit comprises a tank body 10, the tank body 10 is provided with an inner cavity 11 for containing materials and an opening 12 for the materials to enter and exit, and the opening 12 is communicated with the inner cavity 11.

In some embodiments, referring to fig. 1 and 2, the fermentation unit further includes a frame 30, the frame 30 straddles the tank 10, the nanomembrane 31 covers the frame 30, the nanomembrane 31 and the frame 30 form the shed roof structure 3, and the nanomembrane 31 and the tank 10 form a fermentation space in which the material is fermented. The nanometer film 31 is arranged on the frame body 30, the nanometer film 31 is in a suspended state, the workload of manually entering and exiting the material to lift and cover the nanometer film 31 is reduced, the nanometer film 31 is prevented from being damaged due to frequent lifting and covering of the nanometer film 31, the space between the groove body 10 and the nanometer film 31 is large enough, the nanometer film 31 does not need to be lifted integrally, machine operation can be adopted, the material is fed from the side of the opening 12 and discharged, the operation of the nanometer film 31 on the opening side is convenient, and the labor and the time are saved.

It can be understood that the nano-film 31 is a selective gas-permeable film, micro-filtration pores with the pore diameter of 0.2-0.3 μm are uniformly distributed on the film, the filtration pores do not allow macromolecules to pass through, such as odorous gas molecules, bioaerosol and dust, water vapor and carbon dioxide gas molecules can pass through the nano-film 31, part of water vapor generated by high-temperature fermentation in the film forms a water film on the inner surface of the nano-film 31, the odorous gas molecules such as ammonia gas and hydrogen sulfide gas are easily dissolved in water, are absorbed and intercepted by the water film on the inner surface of the nano-film 31, and are decomposed by organic matters after falling down into compost along with the water film, thereby being beneficial to reducing odor emission and ammonia loss, improving the nitrogen content of organic fertilizers formed by compost fermentation. The nano-film 31 has the functions of water resistance, moisture permeability, bacteria isolation, deodorization and the like, the ventilation system conveys oxygen for the material fermentation in the tank body 10, the fermentation tank 1 and the nano-film 31 form a closed fermentation plant, oxygen supply is exchanged by the ventilation system by relying on a high-temperature fermentation linkage technology, the activity of microorganisms is controlled by multi-factor intelligent linkage, the simplicity and flexibility of open composting and the rapidness and environmental protection of closed composting are combined, the problem of diffusion of odor of livestock and poultry feces is solved, the volatilization of ammonia in the compost can be effectively controlled, the moisture content of the material can be rapidly reduced, and the composting period can be shortened. Can realize the high-efficiency, environment-friendly, safe, low-cost and harmless treatment and fertilizer utilization of the livestock and poultry manure and the organic waste.

It is understood that the nanomembrane 31 and the tank body 10 form a fermentation space, which means that there is no gap or structure to communicate with the outside except for communicating with the outside through the nanomembrane 31 itself due to the material property.

It can be understood that the nanomembrane 31 only needs to cover the exposed space and the opening 12 of the tank body 10, so as to save materials and reduce cost. Of course, the nanomembrane 31 may cover other portions of the tank 10.

In some embodiments, referring to fig. 2 and 4, the rack 30 includes an arched steel frame 300, the steel frame 300 straddles the top of the tank 10, and the steel frame 300 is disposed along the length of the tank 10. It can be understood that the steel frame 300 can be designed into other structures such as a flat top or a triangular top, the arched steel frame 300 is covered by the nano-film 31, the arched steel frame 300 has high structural strength and strong bearing capacity, and the arched nano-film 31 is wind-resistant and uniform in rainstorm resistance.

In some embodiments, the steel frame 300 includes a plurality of arch bars 3000, the plurality of arch bars 3000 are arranged along the length direction interval of the tank 10, the top of the tank 10 is an open structure, the arch bar 3000 includes two vertical sections and an arc section, the arc section connects one end of the two vertical sections, the other end of the vertical sections is respectively disposed on the side wall of the tank 10, the steel frame 300 has an arch top, the two sides are disposed in a vertical shape, the space between the tank 10 and the nanomembrane 31 is increased, and the field utilization rate is improved.

Wherein, the steel frame 300 is made of hot galvanizing plastic-coated pipe, and has the anti-corrosion effect.

In some embodiments, the frame 30 further includes a connecting rod 302, the connecting rod 302 is mounted on the arch bar 3000, the connecting rod 302 extends along the length direction of the trough 10, and the connecting rod 302 connects all the arch bars 3000 in series, so as to increase the structural strength of the steel frame 300.

In some embodiments, referring to fig. 9, a connection fixture 304 is disposed on a side of the steel frame 300 facing the tank, and the connection rods 302 are mounted on the connection fixture 304, wherein the connection fixture 304 is a mounting ring, the mounting ring fixes one side of the arch rods 3000 facing the tank 10, the mounting rings on all the arch rods 3000 are located on the same straight line, the connection rods 302 are inserted into the mounting rings, so as to facilitate mounting and dismounting of the connection rods 302, the mounting rings are located on a side of the arch rods 3000 facing the tank 10, and the outer sides of the arch rods 3000 are smooth, so as to ensure that the surface of the nanomembrane 31 is smooth, and avoid local stress damage of the nanomembrane 31.

In some embodiments, a sealing structure 4 is arranged at the joint of the tank body 10 and the nano film 31, the tank body 10 and the nano film 31 are in sealing connection through the sealing structure 4, and the sealing structure 4 ensures that the tank body 10 and the nano film 31 are in sealing connection, so that the phenomenon of leakage at the joint of the tank body 10 and the nano film 31 is avoided, and the phenomenon of leakage of odor generated in the fermentation process and environmental pollution are avoided.

In some embodiments, referring to fig. 6 and 7, the sealing structure 4 includes a sealing portion 40 and a sealing engagement portion 41, the sealing portion 40 is disposed at the top of the tank body and at the side of the opening, and the sealing engagement portion 41 fixes the nano-film 31 on the sealing portion 40, wherein the sealing portion 40 is a sealing strip, the sealing strip is a square groove with a square cross section and an opening at one side, the sealing engagement portion 41 is a steel wire, the nano-film 31 is fixed in the square groove through the steel wire, the steel wire contacts with the inner wall of the square groove, the steel wire is screwed, the nano-film 31 is fixed while the sealing contact between the nano-film 31 and the sealing portion 40 is ensured, the sealing structure is simple, the installation cost is low, and the disassembly of the nano-film 31 is facilitated. It is understood that the sealing part 40 and the sealing engagement part 41 may have a snap structure, and the nanomembrane 31 is snapped between the sealing part 40 and the sealing engagement part 41.

In some embodiments, as described with reference to fig. 2 and 4, sealing portions 40 are disposed on two sides of the steel frame 300, and sealing engagement portions 41 fix the nano-film 31 on the sealing portions 40 of the steel frame 300, where the sealing portions 40 are sealing strips extending along the length direction of the steel frame 300, the sealing strips are square grooves with a square cross section and an opening on one side, the sealing engagement portions 41 are steel wires, the nano-film 31 is fixed in the square grooves through the steel wires, the steel wires are in contact with the inner walls of the square grooves, and the steel wires are screwed tightly, so that the nano-film 31 is convenient to mount and dismount, and the sealing effect is good.

In the foregoing embodiments, the descriptions of the respective embodiments have respective emphasis, and for parts that are not described in detail in a certain embodiment, reference may be made to related descriptions of other embodiments.

In the description of the present application, the terms "first", "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implying any number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more features.

The ice making device provided by the embodiments of the present application is described in detail above, and the principles and embodiments of the present application are explained herein by applying specific examples, and the above description of the embodiments is only used to help understand the method and the core idea of the present application; meanwhile, for those skilled in the art, according to the idea of the present application, there may be variations in the specific embodiments and the application scope, and in summary, the content of the present specification should not be construed as a limitation to the present application.

Claims (10)

1. A ventilation system for tectorial membrane compost, characterized by comprising:

the fermentation unit comprises a fermentation tank and a nano film, and the nano film covers the fermentation tank to form a fermentation space;

a plurality of ventilation pipes arranged in the fermentation space;

the fan is connected with the ventilation pipe;

and the controller is connected with the fan and used for controlling the air quantity of the fan.

2. The ventilation system for coated compost as claimed in claim 1, wherein the ventilation pipe is arranged at the bottom of the fermentation tank, one end of the ventilation pipe is an air inlet, the other end of the ventilation pipe is a sewage outlet, a plurality of air outlets are arranged on a pipe body of the ventilation pipe, the air inlet is connected with the fan, and the sewage outlet is used for discharging sewage generated in the fermentation process.

3. The ventilation system for coated compost according to claim 2, wherein the air outlets are distributed in at least two rows along the tube body of the ventilation tube, and the air outlets in two adjacent rows are staggered.

4. The ventilation system for coated compost according to claim 2, wherein a first switch member is arranged between the air inlet of the ventilation pipe and the fan, a second switch member is arranged at the sewage outlet of the ventilation pipe, and the first switch member and the second switch member are respectively connected with the controller.

5. The ventilation system for coated compost according to claim 2, wherein a plurality of pipe grooves are formed in the bottom of the fermentation tank, the ventilation pipe is installed in the pipe grooves, and the air outlet is located at the notch of the pipe grooves.

6. The ventilation system for coated compost according to claim 5, wherein a padding layer is arranged at the bottom of the fermentation tank, and the upper surface of the padding layer is higher than the air outlet.

7. The ventilation system for film-covered composting as claimed in claim 2, further comprising a first header, said first header being disposed outside said fermentation tank, said first header connecting a plurality of said ventilation pipes to said fan.

8. The ventilation system for compost covered with a film according to claim 7, wherein a first switch member is provided between said first header and said fan;

or a first switch piece is arranged between each ventilation pipe and the first collecting pipe.

9. The ventilation system for film-covered composting as claimed in claim 2, further comprising a second header, wherein a plurality of blow-down ports of the ventilation pipes are connected with the second header, the second header is provided with a second switch, and the second header is used for discharging sewage generated in the fermentation process.

10. The ventilation system for coated compost according to claim 2, wherein the bottom of the fermentation tank is provided with a slope of a preset angle, and the drain outlet is provided at a position where the slope of the bottom is the lowest.

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