Biochemical sludge recycling treatment device and use method thereof

Abstract

The invention provides a biochemical sludge recycling treatment device and a use method thereof, and relates to sludge treatment. The biochemical sludge recycling treatment device comprises a fermentation tank, a cover body is arranged at the top end of the fermentation tank, a power source is arranged at the top end of the cover body, a center shaft is fixedly installed at the output end of the power source and extends into the fermentation tank, and stirring blades are rotationally connected into the fermentation tank. The stirring blades are fixedly connected with the central shaft, the stirring blades are hollow, and seepage holes penetrating through the stirring blades are formed in the outer sides of the stirring blades. According to the device, the fermentation tank is arranged, fermentation materials can be stirred through the stirring blades, oxygen is supplemented through the seepage holes of the stirring blades, aerobic fermentation is facilitated, meanwhile, fermentation liquid can be collected through the seepage holes, and therefore the water content of the fermentation materials can be reduced, and the whole process of biochemical sludge resourceful treatment can be achieved in one device; the transfer time is shortened; and the production cost is reduced.

Description

Technical Field

[0001] The invention relates to sludge treatment, in particular to a biochemical sludge resource treatment device and a use method thereof. Background Art

[0002] Biochemical sludge is the precipitated material produced during the biological treatment of sewage. When sewage passes through biological treatment units, such as aeration tanks in the activated sludge method or biofilters in the biofilm method, microorganisms will decompose organic pollutants in the sewage. In this process, microorganisms continue to proliferate and combine with suspended matter, colloids and other substances in the sewage to form floccules that settle down. This is biochemical sludge. Biochemical sludge contains a large amount of organic matter, including the cell components of the microorganisms themselves, such as proteins, polysaccharides, nucleic acids, etc., as well as organic matter in sewage that is adsorbed and not completely decomposed. However, the content of heavy metals in biochemical sludge is also relatively high.

[0003] The existing patent (CN111285574B) is a preparation method of a sediment heavy metal pollution repair agent, which mainly includes the following steps: using quinoa as raw material, hydrothermally activating carbonized biomass; preparing biochar by low-temperature pyrolysis and carbonization under anaerobic conditions; mixing biochar with clay, bentonite, and kaolin; adding sodium dodecyl sulfate and stirring at high speed; adding NaHCO3, KHCO3, Ca(HCO3)2, and Mg(HCO3)2 and stirring evenly; heat treatment for 1h-2h under vacuum conditions; and preparing sediment heavy metal pollution repair agent by high-temperature pyrolysis and carbonization under anaerobic conditions. The prepared biochar repair agent overcomes the shortcomings of biochar's large buoyancy and difficulty in sedimentation, and achieves efficient adsorption of Cd2+, Pb2+, Cu2+, and Hg2+ in water and fixed sediment.

[0004] The sediment heavy metal pollution remediation agent provided by the invention has a certain ability to adsorb heavy metal pollutants in water and fix sediment, and provides an idea for treating sludge using the heavy metal pollution remediation agent.

[0005] The existing patent (CN101962302B) discloses a method for preparing organic fertilizer using residual sludge from sewage treatment, comprising: (1) acidification and pulping of sludge; (2) heating treatment; (3) filtration and washing; (4) neutralization treatment of mud cake; (5) preparing organic fertilizer from mud cake: granulating, drying and packaging the mud cake to make organic fertilizer.

[0006] This technical solution removes heavy metals from sludge, ensures the safety of organic fertilizers prepared from sludge in agricultural production, eliminates the environmental risks of sludge resource utilization, and creates the prerequisite for large-scale agricultural use of sludge. However, this technical solution requires the sludge to be transferred multiple times in different devices, which increases the cost of transportation. Summary of the invention

[0007] In view of the deficiencies in the prior art, the present invention provides a biochemical sludge resource disposal device and a method of using the same, which solves the problems raised in the above background technology.

[0008] To achieve the above objectives, the present invention is implemented through the following technical solutions: a biochemical sludge resource disposal device and a method of using the same include a fermentation tank, a cover body is provided at the top of the fermentation tank, a power source is provided at the top of the cover body, a central axis is fixedly installed at the output end of the power source, the central axis extends to the interior of the fermentation tank, a stirring blade is rotatably connected to the interior of the fermentation tank, the stirring blade is fixedly connected to the central axis, the stirring blade is hollow, and a seepage hole penetrating the stirring blade is provided on the outer side of the stirring blade, a supply cavity is provided inside the fermentation tank, the supply cavity is fixedly connected to the cover body, and the inner bottom wall of the supply cavity is rotatably connected to the cover body. A rotating ring is connected, and a connecting pipe connected to the supply cavity is fixedly installed in the middle of the rotating ring. The connecting pipe is sleeved inside the stirring blade. The outer surface of the supply cavity is connected to and penetrated by a supply pipe. The supply pipe extends to the outside of the fermentation tank. A three-position reversing valve including a closing position is arranged at one end of the supply pipe away from the supply cavity. Two of the connecting ports of the three-position reversing valve are respectively connected to a liquid suction pipe connected to an existing liquid suction device, and an air supply pipe connected to an existing air supply device. An exhaust hole is opened above the cover body. The exhaust hole is located above the cover body and is connected to and penetrated by a pressure relief valve. A control valve is arranged at the exhaust end of the pressure relief valve.

[0009] Preferably, the stirring blades are divided into two groups, an inner ring and an outer ring. The stirring blades of the inner ring are fixedly connected to the central shaft through an inner fixed ring. An outer fixed ring is fixedly installed above the outer surface of the stirring blades of the outer ring. The inner ring of the inner fixed ring is provided with a friction ring. An extension rod is fixedly installed on the outer ring of the inner fixed ring. The extension rod extends to the interior of the friction ring. Telescopic friction blocks in contact with the inner wall of the friction ring are fixedly installed on the upper and lower sides of one end of the extension rod located inside the friction ring.

[0010] Preferably, the rotating ring is divided into an inner rotating ring and an outer rotating ring, the outer rotating ring is sleeved on the outer ring of the inner rotating ring, the supply cavity is located between the inner rotating ring and the outer rotating ring, a partition is fixedly installed, there are two supply pipes, one is connected to and penetrates the inner ring of the partition. The outer ring of one partition is connected and penetrated, the two air supply pipes are connected through a converging three-way valve, and the two liquid suction pipes are connected through a diverting three-way valve.

[0011] Preferably, a pressure plate is slidably connected to the inside of the fermentation tank, and the pressure plate is located below the inner fixed ring. The pressure plate is sleeved on the outer surface of the central axis and the stirring blade, and a telescopic sleeve is fixedly installed on the top edge of the pressure plate. The telescopic sleeve is fixedly connected to the cover body. The pressure plate includes four layers of ring plates that are sleeved with each other and clamped by limit grooves and limit rings. The two middle groups of ring plates are provided with notches with the same cross-sectional shape as the stirring blade.

[0012] Preferably, there are multiple exhaust holes, which are distributed in a ring array, and the cover body is located above the exhaust holes and is fixedly connected with a connecting ring, and the pressure relief valve is connected to and communicates with the connecting ring.

[0013] Preferably, a feeding unit is arranged above the side wall of the fermentation tank, and a discharging unit is arranged below the side wall of the fermentation tank.

[0014] Preferably, the stirring blade includes a vertical semi-circular cavity, with a sleeve connected to and passing through the top of the cavity, the inner diameter of the sleeve is larger than the outer diameter of the connecting tube, the top of the sleeve is located below the rotating ring, and the inner fixed ring and the outer fixed ring are both fixedly mounted on the outer surface of the sleeve.

[0015] Preferably, a clamping block is fixedly installed at the bottom end of the stirring blade, the inner bottom wall of the fermenter is provided with a clamping groove rotatably connected to the clamping block, and the inner bottom wall of the fermenter is provided with a mounting groove rotatably connected to the central axis.

[0016] Preferably, a lower connecting plate is provided on the upper surface of the supply cavity, a connecting column is fixedly installed on the upper surface of the lower connecting plate, an upper connecting plate is fixedly installed on the top of the connecting column, the upper connecting plate is fixedly connected to the cover body by bolts, and the bolts connect the lower connecting plate and the supply cavity.

[0017] A method for recycling and utilizing biochemical sludge comprises the following steps:

[0018] Step 1, the biochemical sludge is subjected to aerobic fermentation and anaerobic fermentation in a fermentation tank and the fermented biochemical sludge is made acidic;

[0019] Step 2: The pressing plate is lowered and the precipitate is discharged through the suction pipe to reduce the water content of the biochemical sludge;

[0020] Step 3, adding soil heavy metal remediation agent and stirring with stirring blades to make the biochemical sludge neutral;

[0021] Step 4, the biochemical sludge is aerobically fermented in a fermentation tank;

[0022] Step 5, add inorganic fertilizer, stir with stirring blades, and adjust pH value;

[0023] Step six: Arrange materials and package.

[0024] Compared with the prior art, the present invention has the following beneficial effects:

[0025] 1. The invention provides a fermentation tank and hollow stirring blades in the fermentation tank. The stirring blades can be used to stir the fermented product. The seepage holes of the stirring blades can be used to supplement oxygen to facilitate aerobic fermentation. The seepage holes can be used to collect the fermented liquid, thereby reducing the water content of the fermented product. The entire process of biochemical sludge resource treatment can be realized in one device, which reduces the transportation time and reduces the production cost.

[0026] 2. The invention, by setting an air supply pipe connected to the air supply device, has an exhaust hole on the top of the cover body, through which the gas generated in the fermentation process can be discharged. The exhaust hole is located above the cover body and is connected to and penetrated by a pressure relief valve. When the internal gas accumulation is greater than the opening value of the pressure relief valve, the pressure relief valve opens for exhaust. A control valve is provided at the exhaust end of the pressure relief valve. The air outlet end of the control valve is connected to the exhaust gas treatment device, which can remove odor and harmful gases generated in the fermentation process and avoid polluting the environment.

[0027] 3. The invention is divided into an inner rotating ring and an outer rotating ring by setting a rotating ring, the outer rotating ring is sleeved on the outer ring of the inner rotating ring, the supply cavity is located between the inner rotating ring and the outer rotating ring, and a partition is fixedly installed. There are two supply pipes, one of which is connected to and penetrates the inner ring of the partition. The outer ring of a partition is connected and penetrated, the two air supply pipes are connected through a converging three-way valve, and the two liquid suction pipes are connected through a diverting three-way valve. Through such a setting, the fermentation liquid can be sucked out and oxygen can be supplied at the same time, and the positions can be exchanged.

[0028] 4. The invention divides the stirring blades into two groups, an inner ring and an outer ring, wherein the stirring blades of the inner ring are fixedly connected to the central axis through an inner fixed ring, an outer fixed ring is fixedly installed above the outer surface of the stirring blades of the outer ring, a friction ring is provided on the inner ring of the inner fixed ring, an extension rod is fixedly installed on the outer ring of the inner fixed ring, the extension rod extends to the inside of the friction ring, and telescopic friction blocks in contact with the inner wall of the friction ring are fixedly installed on the upper and lower sides of one end of the extension rod located inside the friction ring. With such an arrangement, the outer fixed ring can rotate with the inner fixed ring only when the telescopic friction block is in contact with the friction ring, and only the inner fixed ring rotates when separated. Such an arrangement can realize zoned staggered stirring. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a schematic diagram of the structure of the present invention;

[0030] Figure 2 This is a schematic diagram of the cover connection of the present invention;

[0031] Figure 3 This is a schematic diagram of the connection of the supply chamber of the present invention;

[0032] Figure 4 This is a schematic diagram of the central axis connection of the present invention;

[0033] Figure 5 This is a schematic diagram of the connection of the pressing plate of the present invention;

[0034] Figure 6 It is a half-section schematic diagram of the fermentation tank of the present invention;

[0035] Figure 7 This is a schematic diagram of the connection of the pressure relief valve of the present invention;

[0036] Figure 8 This is a schematic diagram of the connection column of the present invention.

[0037] In the figure: 1, fermentation tank; 2, cover; 3, power source; 4, central axis; 5, stirring blade; 6, seepage hole; 7, supply cavity; 8, rotating ring; 9, connecting pipe; 10, supply pipe; 11, suction pipe; 12, air supply pipe; 13, exhaust hole; 14, pressure relief valve; 15, control valve; 32, inner fixed ring; 16, outer fixed ring; 17, friction ring; 18, extension rod; 19, telescopic friction block; 81, inner rotating ring; 82, outer rotating ring ; 83. partition; 84. converging three-way valve; 85. diverting three-way valve; 20. pressure plate; 21. telescopic sleeve; 22. limiting groove; 23. limiting ring; 24. ring plate; 25. notch; 26. connecting ring; 27. feeding unit; 28. sleeve; 29. ​​clamping block; 30. clamping groove; 31. mounting groove; 33. discharging unit; 34. three-position reversing valve; 35. lower connecting plate; 36. connecting column; 37. upper connecting plate; 38. bolt. DETAILED DESCRIPTION

[0038] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0039] It should be noted that all directional indications in the embodiments of the present application are only used to explain the relative position relationship, movement status, etc. between the components in a certain specific posture. If the specific posture changes, the directional indication will also change accordingly.

[0040] In this application, unless otherwise clearly specified and limited, the terms "connection", "fixation", etc. should be understood in a broad sense. For example, "fixation" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0041] In addition, in this application, descriptions such as "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in this field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by this application.

[0042] like Figure 1-8As shown, a biochemical sludge resource disposal device and a method of using the same include a fermentation tank 1, a cover body 2 is provided at the top of the fermentation tank 1, a power source 3 is provided at the top of the cover body 2, the power source 3 is composed of a motor and a gearbox, a central axis 4 is fixedly installed at the output end of the power source 3, the central axis 4 extends to the inside of the fermentation tank 1, a stirring blade 5 is rotatably connected to the inside of the fermentation tank 1, the stirring blade 5 is fixedly connected to the central axis 4, the stirring blade 5 is hollow, and a seepage hole 6 penetrating the stirring blade 5 is provided on the outside of the stirring blade 5, the cross-sectional shape of the seepage hole 6 is a boss shape, and the outer diameter is larger than the inner diameter, a supply cavity 7 is provided inside the fermentation tank 1, the supply cavity 7 is fixedly connected to the cover body 2, a rotating ring 8 is rotatably connected to the inner bottom wall of the supply cavity 7, a connecting pipe 9 connected to the supply cavity 7 is fixedly installed in the middle of the rotating ring 8, and the connecting pipe 9 is sleeved inside the stirring blade 5. Through such an arrangement, the connecting pipe 9 can rotate with the stirring blade 5, and the outer surface of the supply cavity 7 is connected and penetrated by a supply pipe 10. The supply pipe 10 extends to the outside of the fermentation tank 1. A three-position reversing valve 34 including a closing position is provided at one end of the supply pipe 10 away from the supply cavity 7. Two of the connection ports of the three-position reversing valve 34 are respectively connected to a liquid suction pipe 11 connected to an existing liquid suction device, and an air supply pipe 12 connected to an existing air supply device. By switching the positions, the supply pipe 10 can be used to suck out liquid or supply oxygen and be in a closed state. An exhaust hole 13 is provided above the cover body 2, and the gas generated during the fermentation process can be discharged through the exhaust hole 13. The exhaust hole 13 is located above the cover body 2 and is connected and penetrated by a pressure relief valve 14. When the internal gas accumulation is greater than the opening value of the pressure relief valve 14, the pressure relief valve 14 is opened for exhaust. A control valve 15 is provided at the exhaust end of the pressure relief valve 14. The control valve 15 can be in an open state or a closed state, so as to determine whether gas exchange with the outside world is performed. The air outlet end of the control valve 15 is connected to an exhaust gas treatment device, which can remove odor and harmful gases generated during the fermentation process to avoid polluting the environment.

[0043] The stirring blades 5 are divided into two groups, an inner ring and an outer ring. The stirring blades 5 of the inner ring are fixedly connected to the central shaft 4 through an inner fixed ring 32. An outer fixed ring 16 is fixedly installed above the outer surface of the stirring blades 5 of the outer ring. A friction ring 17 is provided on the inner ring of the inner fixed ring 32. An extension rod 18 is fixedly installed on the outer ring of the inner fixed ring 32. The extension rod 18 extends to the inside of the friction ring 17. The extension rod 18 is located at one end of the friction ring 17, and telescopic friction blocks 19 in contact with the inner wall of the friction ring 17 are fixedly installed on the upper and lower sides. With such an arrangement, only when the telescopic friction block 19 is in contact with the friction ring 17, the outer fixed ring 16 can rotate with the inner fixed ring 32. When separated, only the inner fixed ring 32 rotates. With such an arrangement, zoned staggered stirring can be achieved.

[0044] The rotating ring 8 is divided into an inner rotating ring 81 and an outer rotating ring 82. The outer rotating ring 82 is sleeved on the outer ring of the inner rotating ring 81. The supply chamber 7 is located between the inner rotating ring 81 and the outer rotating ring 82 and fixedly installed with a partition 83. There are two supply pipes 10, one of which is connected to and penetrates the inner ring of the partition 83. The outer ring of one partition 83 is connected and penetrated. The two air supply pipes 12 are connected through the converging three-way valve 84, and the two liquid suction pipes 11 are connected through the diverting three-way valve 85. Through such a setting, the fermentation liquid can be sucked out and the oxygen can be supplied at the same time, and the positions can be exchanged.

[0045] A pressing plate 20 is slidably connected to the inside of the fermentation tank 1. The pressing plate 20 is located below the inner fixed ring 32. The pressing plate 20 is sleeved on the outer surface of the central axis 4 and the stirring blade 5. A telescopic sleeve 21 is fixedly installed on the top edge of the pressing plate 20. The telescopic sleeve 21 is fixedly connected to the cover body 2. The pressing plate 20 includes four layers of ring sheets 24 that are sleeved with each other and clamped by limit grooves 22 and limit rings 23. The middle two groups of ring sheets 24 are provided with notches 25 with the same cross-sectional shape as the stirring blade 5. By setting the pressing plate 20, the telescopic sleeve 21 can be extended to drive the pressing plate 20 to move downward, so that the liquid in the fermentation product can be squeezed and flow into the inside of the stirring blade 5 through the seepage hole 6. Such a setting can reduce the moisture content in the fermentation product.

[0046] There are multiple exhaust holes 13 distributed in a circular array. The cover body 2 is fixedly connected with a connecting ring 26 above the exhaust holes 13. The pressure relief valve 14 is connected and connected to the connecting ring 26. Such an arrangement can make exhaust smoother.

[0047] A feeding unit 27 is arranged above the side wall of the fermentation tank 1 , and a discharging unit 33 is arranged below the side wall of the fermentation tank 1 . Such an arrangement can facilitate feeding and discharging, while limiting the feeding unit 27 to be located below the pressing plate 20 .

[0048] The stirring blade 5 includes a vertical semi-circular cavity. This arrangement ensures that the pressing plate 20 can slide downward smoothly. A sleeve 28 is connected to and penetrates the top of the cavity. The inner diameter of the sleeve 28 is larger than the outer diameter of the connecting tube 9. The top of the sleeve 28 is located below the rotating ring 8. Through this limitation, the gas generated by the fermentation can be discharged from the gap between the sleeve 28 and the connecting tube 9. The inner fixed ring 32 and the outer fixed ring 16 are both fixedly mounted on the outer surface of the sleeve 28, and the sleeve 28 serves as a connection there.

[0049] A clamping block 29 is fixedly installed at the bottom end of the stirring blade 5, and a clamping groove 30 rotatably connected to the clamping block 29 is provided on the inner bottom wall of the fermentation tank 1. A mounting groove 31 rotatably connected to the central axis 4 is provided on the inner bottom wall of the fermentation tank 1. Through such an arrangement, the stirring blade 5 and the central axis 4 can be limited.

[0050] A lower connecting piece 35 is provided on the upper surface of the supply cavity 7, a connecting column 36 is fixedly installed on the upper surface of the lower connecting piece 35, an upper connecting piece 37 is fixedly installed on the top of the connecting column 36, the upper connecting piece 37 is fixedly connected to the cover body 2 by bolts 38, the bolts 38 connect the lower connecting piece 35 and the supply cavity 7, the diameter of the lower connecting piece 35 is smaller than the diameter of the upper connecting piece 37, the lower connecting piece 35 is fixedly installed on the edge of the supply cavity 7, the upper connecting piece 37 can be partially located on the outside of the supply cavity 7, the bolts 38 are installed on the part outside the supply cavity 7, and through such an arrangement, the bolts 38 can be installed from the gap.

[0051] Step 1, the biochemical sludge is subjected to aerobic fermentation and anaerobic fermentation in a fermentation tank 1 and the fermented biochemical sludge is made acidic;

[0052] First, the biochemical sludge is fed from the feed unit 27 into the fermentation tank 1 for aerobic fermentation. The process of aerobic fermentation includes supplying oxygen to the supply pipe 10 through the air supply pipe 12 and opening the control valve 15. At this time, oxygen is introduced into the fermentation product for aerobic fermentation, and the generated waste gas is discharged from the pressure relief valve 14. The main function of aerobic fermentation is to decompose organic matter, so that the matter is more easily absorbed and utilized by plants, providing nutrients for plant growth.

[0053] The process of anaerobic fermentation includes switching the three-position reversing valve 34 to the closed position to isolate oxygen from entering, periodically opening the control valve 15, and using the pressure relief valve 14 to discharge the gas generated inside when in the open state. The role of anaerobic fermentation is that organic materials are decomposed in an anaerobic environment, and the nitrogen therein is mainly preserved in the form of ammonia nitrogen. This ammonium nitrogen is an effective nitrogen form that can be absorbed and utilized by plants, and can provide nitrogen for crops in the subsequent fertilization process. At the same time, anaerobic fermentation produces acidic substances that cause heavy metal ions in biochemical sludge to precipitate.

[0054] Step 2: The pressing plate 20 is lowered and the precipitate is discharged through the suction pipe 11 to reduce the water content of the biochemical sludge. The telescopic sleeve 21 can drive the pressing plate 20 to move downward, so that the liquid in the fermentation product can be squeezed and flow into the inside of the stirring blade 5 through the seepage hole 6. The three-position reversing valve 34 is switched to the discharge position, and the precipitate is discharged by using an external suction device;

[0055] Step 3, adding soil heavy metal repair agent. Before adding the soil heavy metal repair agent, sampling and testing are performed to determine the proportion of adding the soil heavy metal repair agent. There are many types of soil heavy metal repair agents, which are selected according to the type of heavy metals, and stirred by the stirring blade 5 to mix evenly. The soil heavy metal repair agent is neutralized by alkaline and acidic sludge to make the biochemical sludge neutral;

[0056] Step 4: The biochemical sludge is aerobically fermented in the fermentation tank 1. Aerobic fermentation can fully decompose the sludge. During the aerobic fermentation, the high temperature stage can generally reach 60-70°C, which can effectively kill pathogens.

[0057] Step 4: Add inorganic fertilizers, stir by the stirring blade 5, and add necessary inorganic fertilizers to improve fertility. Add reagents to adjust the pH value according to the pH value of different crops.

[0058] Step six: Arrange materials and package.

[0059] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification.

[0060] In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the fact that they can be implemented by ordinary technicians in this field. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by this application.

[0061] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A biochemical sludge resource disposal device, comprising a fermentation tank (1), characterized in that: The top of the fermentation tank (1) is provided with a cover body (2), the top of the cover body (2) is provided with a power source (3), the output end of the power source (3) is fixedly mounted with a central shaft (4), and the central shaft (4) extends into the interior of the fermentation tank (1); The fermentation tank (1) is rotatably connected to a stirring blade (5), the stirring blade (5) is fixedly connected to the central shaft (4), the stirring blade (5) is hollow, and a seepage hole (6) penetrating the stirring blade (5) is provided on the outer side of the stirring blade (5); The fermentation tank (1) is provided with a supply cavity (7) inside, the supply cavity (7) is fixedly connected to the cover body (2), the inner bottom wall of the supply cavity (7) is rotatably connected to a rotating ring (8), a connecting pipe (9) connected to the supply cavity (7) is fixedly installed in the middle of the rotating ring (8), and the connecting pipe (9) is sleeved inside the stirring blade (5); The outer surface of the supply cavity (7) is connected to and penetrated by a supply pipe (10), the supply pipe (10) extends to the outside of the fermentation tank (1), and one end of the supply pipe (10) away from the supply cavity (7) is provided with a three-position reversing valve (34) including a closing position, and two connecting ports of the three-position reversing valve (34) are respectively connected to a liquid suction pipe (11) connected to an existing liquid suction device, and an air supply pipe (12) connected to an existing air supply device; An exhaust hole (13) is provided above the cover body (2). The exhaust hole (13) is located above the cover body (2) and is connected to and penetrates a pressure relief valve (14). A control valve (15) is provided at the exhaust end of the pressure relief valve (14).

2. The biochemical sludge resource disposal device according to claim 1 is characterized in that: The stirring blades (5) are divided into two groups, an inner ring and an outer ring. The stirring blades (5) of the inner ring are fixedly connected to the central shaft (4) through an inner fixed ring (32). An outer fixed ring (16) is fixedly installed above the outer surface of the stirring blades (5) of the outer ring. A friction ring (17) is provided on the inner ring of the inner fixed ring (32). An extension rod (18) is fixedly installed on the outer ring of the inner fixed ring (32). The extension rod (18) extends to the inside of the friction ring (17). A telescopic friction block (19) in contact with the inner wall of the friction ring (17) is fixedly installed on the upper and lower sides of one end of the extension rod (18) located inside the friction ring (17).

3. The biochemical sludge resource disposal device according to claim 2 is characterized in that: The rotating ring (8) is divided into an inner rotating ring (81) and an outer rotating ring (82), the outer rotating ring (82) is sleeved on the outer ring of the inner rotating ring (81), the supply cavity (7) is located between the inner rotating ring (81) and the outer rotating ring (82), and a partition (83) is fixedly installed, the number of supply pipes (10) is two, one is connected to and penetrates the inner ring of the partition (83), and the other is connected to and penetrates the outer ring of the partition (83), the two air supply pipes (12) are connected through a converging three-way valve (84), and the two liquid suction pipes (11) are connected through a diverting three-way valve (85).

4. The biochemical sludge resource disposal device according to claim 3 is characterized in that: The fermentation tank (1) is internally slidably connected with a pressing plate (20), the pressing plate (20) being located below the inner fixed ring (32), the pressing plate (20) being sleeved on the central shaft (4) and the outer surface of the stirring blade (5), the top edge of the pressing plate (20) being fixedly mounted with a telescopic sleeve (21), the telescopic sleeve (21) being fixedly connected to the cover body (2), the pressing plate (20) comprising four layers of ring sheets (24) which are sleeved with each other and clamped by limiting grooves (22) and limiting rings (23), and the middle two groups of ring sheets (24) are provided with notches (25) having the same cross-sectional shape as the stirring blade (5).

5. A biochemical sludge resource disposal device according to any one of claims 1 to 4, characterized in that: The exhaust holes (13) are multiple in number and are distributed in a ring array. The cover body (2) is located above the exhaust holes (13) and is fixedly connected to a connecting ring (26). The pressure relief valve (14) is connected to and communicates with the connecting ring (26).

6. The biochemical sludge resource disposal device according to claim 5 is characterized by: A feeding unit (27) is arranged above the side wall of the fermentation tank (1), and a discharging unit is arranged below the side wall of the fermentation tank (1).

7. The biochemical sludge resource disposal device according to claim 6 is characterized by: The stirring blade (5) comprises a vertical semi-circular cavity, the upper part of which is connected to and penetrated by a sleeve (28), the inner diameter of the sleeve (28) is larger than the outer diameter of the connecting pipe (9), the top of the sleeve (28) is located below the rotating ring (8), and the inner fixed ring (32) and the outer fixed ring (16) are both fixedly mounted on the outer surface of the sleeve (28).

8. A biochemical sludge resource disposal device according to claim 6 or 7, characterized in that: A clamping block (29) is fixedly mounted on the bottom end of the stirring blade (5); a clamping groove (30) rotatably connected to the clamping block (29) is provided on the inner bottom wall of the fermentation tank (1); and a mounting groove (31) rotatably connected to the central shaft (4) is provided on the inner bottom wall of the fermentation tank (1).

9. The biochemical sludge resource disposal device according to claim 8, characterized in that: The upper surface of the supply cavity (7) is provided with a lower connecting piece (35), a connecting column (36) is fixedly installed on the upper surface of the lower connecting piece (35), an upper connecting piece (37) is fixedly installed on the top of the connecting column (36), the upper connecting piece (37) is fixedly connected to the cover body (2) by bolts (38), and the bolts (38) connect the lower connecting piece (35) and the supply cavity (7).

10. A method for recycling and utilizing biochemical sludge, characterized in that: The biochemical sludge resource disposal device according to claim 9 comprises the following steps: Step 1: The biochemical sludge is subjected to aerobic fermentation and anaerobic fermentation in a fermentation tank (1) and the fermented biochemical sludge is made acidic; Step 2, the pressing plate (20) is lowered and the precipitate is discharged through the suction pipe (11) to reduce the water content of the biochemical sludge; Step 3, adding soil heavy metal remediation agent and stirring by stirring blades (5) to make the biochemical sludge neutral; Step 4, the biochemical sludge is aerobically fermented in the fermentation tank (1); Step 5, adding inorganic fertilizer, stirring with a stirring blade (5), and adjusting the pH value; Step six: Arrange materials and package.

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