Breeding manure anaerobic treatment device and treatment method

Abstract

The invention relates to an anaerobic treatment device and method for breeding manure, and belongs to the technical field of anaerobic digestion processes, the anaerobic treatment device comprises a separation tower, the separation tower comprises a water outlet chamber, the water outlet chamber is arranged in the separation tower, and clear water after sludge separation flows into the water outlet chamber; the water outlet pipe and the water return pipe are connected with the water outlet chamber; water flow power mechanisms are arranged on the water outlet pipe and the water return pipe; an electromagnet is arranged in the single-pole double-throw switch, and on-off of the water flow power mechanisms of the water outlet pipe and the water return pipe is switched after on-off of the electromagnet; the sliding block and the compression spring are arranged on the inner wall of the water outlet chamber; the compression spring is fixedly connected with the sliding block; the end of the sliding block moves under the action of water pressure. No less than two sliding blocks and no less than two compression springs are arranged; the rheostat is connected with the electromagnet and controls on-off of the electromagnet; the slider is slidably connected with the rheostat for adjusting resistance of the rheostat. The device has the effect of detecting the sludge content in the discharged clear water flow.

Description

Technical Field

[0001] This application relates to the technical field of anaerobic digestion processes, and in particular to an anaerobic treatment device and method for breeding manure sewage. Background Art

[0002] Breeding manure sewage is usually treated by anaerobic treatment technology. The basic process includes two stages: pretreatment and anaerobic digestion. In the pretreatment stage, large particulate suspensions are removed by solid-liquid separation. The separated liquid part enters the anaerobic reactor, and organic matter is gradually degraded by anaerobic microbial communities in a closed environment to generate methane and carbon dioxide.

[0003] The mixed liquid after anaerobic treatment needs to be separated into sludge, clear water and biogas through a gas-liquid-solid three-phase separator. During the upward movement of the mixed liquid in the reactor, biogas escapes in the form of tiny bubbles, enters the gas chamber after being deflected by the baffle plate, and is discharged. The sludge slides back to the bottom of the reactor due to gravity sedimentation, and the separated clear water is discharged from the overflow weir.

[0004] To improve the treatment efficiency, it is usually necessary to adjust the upflow velocity in the reactor. If the upflow velocity in the reactor is too high, some flocculent sludge that has not completely settled will be carried by the water flow to the clear water area, resulting in excessive turbidity of the effluent. In the prior art, a turbidimeter can be used to monitor the concentration of flocs, but bubbles and high-concentration suspended solids in the water body easily interfere with the ultrasonic signal of the turbidimeter, resulting in measurement errors; at the same time, the probe is extremely vulnerable to fouling accumulation, affecting the accuracy; in addition, when the turbidity changes suddenly, the turbidimeter monitoring lags behind, and the water flow velocity cannot be adjusted in time, and the clear water containing flocs is also discharged into the clear water chamber without timely reaction. Summary of the Invention

[0005] In order to improve the problem that pollutants in the clear water flow cannot be detected in time in the prior art, this application provides an anaerobic treatment device and method for breeding manure sewage.

[0006] An anaerobic treatment device and method for breeding manure sewage provided by this application adopt the following technical solutions:

[0007] An anaerobic treatment device for breeding manure sewage, including a separation tower, the separation tower includes:

[0008] An effluent chamber, arranged inside the separation tower, and the clear water after separating sludge flows into the effluent chamber;

[0009] An outlet pipe and a return pipe, both connected to the effluent chamber; a water flow power mechanism is arranged on both the outlet pipe and the return pipe;

[0010] A single-pole double-throw switch, an electromagnet is arranged inside the single-pole double-throw switch, and after the electromagnet is turned on and off, the on and off of the water flow power mechanisms of the outlet pipe and the return pipe are switched;

[0011] A slider and a compression spring are both arranged on the inner wall of the water outlet chamber; the compression spring is fixedly connected to the slider; the end of the slider moves under the action of water pressure; there are no less than two sliders and the compression springs;

[0012] A rheostat is connected to the electromagnet and controls the on-off of the electromagnet; the slider is slidably connected to the rheostat for adjusting the resistance value of the rheostat.

[0013] Optionally, the water flow power mechanism includes a water pump and a solenoid valve arranged on the water outlet pipe and the water return pipe.

[0014] Optionally, the single-pole double-throw switch further includes: a sliding piece, and the electromagnet magnetically adsorbs to move the sliding piece;

[0015] A switch moving piece and a switch fixed piece, two of the switch moving pieces are fixedly arranged on the sliding piece; the two switch fixed pieces are respectively arranged on both sides of the sliding piece; after the sliding piece moves, the switch moving piece on one side is in electrical contact with the switch fixed piece; the switch moving piece is connected to the power supply, and the switch fixed piece is connected to the water flow power mechanism electrically.

[0016] A tension spring is fixedly connected to the sliding piece.

[0017] Optionally, the rheostat includes: an insulating cylinder, and a resistance wire is wound around the circumference of the insulating cylinder;

[0018] A sleeve plate is fixedly connected to one end of the slider and is slidably connected to the insulating cylinder at the other end;

[0019] A metal rod, the sleeve plate is slidably connected to the metal rod; the sleeve plate is electrically connected to the resistance wire and the metal rod respectively.

[0020] Optionally, a water inlet pipe is fixedly connected to the separation tower; the water return pipe is connected to the water inlet pipe.

[0021] Optionally, the electromagnet is connected to the rheostat through a comparator and a relay.

[0022] Optionally, a mud hopper is arranged at the bottom of the separation tower; the mud hopper includes a hopper groove; the vertical side wall of the hopper groove is inclined.

[0023] Optionally, a three-phase separator is arranged in the separation tower; a collection chamber is fixedly arranged at the top of the separation tower.

[0024] Optionally, the three-phase separator includes a plurality of gas collecting rings arranged in an alternating manner; the gas collecting ring includes two annular plates fixedly connected to each other and arranged obliquely.

[0025] A method for anaerobic treatment of aquaculture manure sewage uses the separation tower to treat the mixed liquid containing sludge and then discharges clear water and biogas.

[0026] In summary, the present application includes at least one of the following beneficial technical effects:

[0027] 1. The annular coaxial water outlet chamber structure provided in the separation tower can reduce the flow rate and expand the cross-sectional area of the flow channel, reduce the turbulence of the mixed liquid, and promote the natural sedimentation of sludge; the multi-layer staggered gas collection rings in the separation tower separate biogas and sludge through collision, improve the sludge sedimentation efficiency, and reduce the residue of flocs in the clear water area.

[0028] 2. The pressure sensor reflects the change in the density of the mixed liquid through the displacement of the slider, converts the physical signal into an electrical signal in combination with the sliding rheostat, and uses a comparator and a relay circuit to judge the sludge concentration threshold in real time, trigger the electromagnet to switch the flow direction, avoid the bubble interference problem of the traditional turbidimeter, and reduce manual intervention.

[0029] 3. The parallel circuit of multiple sliding rheostats increases logical judgment, and only triggers the reflux when multiple sensors all detect that the sludge exceeds the standard, avoiding single-point misjudgment. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 is a cross-sectional view of the separation tower in the embodiment of the present application.

[0031] Figure 2 is a schematic structural diagram of the rheostat in the embodiment of the present application.

[0032] Reference numerals: 1, separation tower; 2, sludge hopper; 3, three-phase separator; 4, water outlet chamber; 5, collection chamber; 6, hopper groove; 7, gas collection ring; 8, water outlet pipe; 9, return pipe; 10, water inlet pipe; 11, slider; 12, compression spring; 13, dispersion leaf; 14, insulating cylinder; 15, resistance wire; 16, sleeve plate; 17, metal rod; 18, support shaft; 19, water pump. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0033] The following further describes the present application in detail Figure 1-2 in conjunction with the accompanying drawings.

[0034] The embodiment of the present application discloses an anaerobic treatment device and method for breeding manure. The anaerobic treatment device for breeding manure includes a separation tower 1. A sludge hopper 2, a three-phase separator 3 and a water outlet chamber 4 are arranged in the inner cavity of the separation tower 1; a collection chamber 5 is arranged at the top of the separation tower 1. Preferably, the cross-sections of the inner cavity of the separation tower 1 and the water outlet chamber 4 are both circular. The water outlet chamber 4 is vertically fixed in the separation tower 1 and is coaxially arranged with the separation tower 1. The bottom end of the water outlet chamber 4 is connected to the bottom of the inner cavity, so that the cross-section of the inner cavity is annular.

[0035] The sludge hopper 2 is arranged at the bottom of the inner chamber of the separation tower 1. The sludge hopper 2 includes an annular hopper groove 6 opened at the bottom of the inner chamber. The two vertical inner walls of the hopper groove 6 are inclined inward in the vertical direction, so that the longitudinal section of the hopper groove 6 is conical. The bottom end of the separation tower 1 is connected to a water inlet pipe 10, and the water inlet pipe 10 is higher than the hopper groove 6 in the vertical direction. The mixed liquid containing sludge flows into the inner chamber through the water inlet pipe 10; after the sludge in the mixed liquid discharges biogas, it falls under its own gravity and finally falls into the hopper groove 6.

[0036] The three-phase separator 3 is arranged around the water outlet chamber 4. The three-phase separator 3 includes a plurality of gas collecting rings 7. Preferably, there are two layers of the plurality of gas collecting rings 7 arranged in the vertical direction; the gas collecting ring 7 located above and the gas collecting ring 7 located below are arranged in a staggered manner to increase the coverage area of the three-phase separator 3. Two adjacent gas collecting rings 7 are fixedly connected to provide a supporting function.

[0037] In one embodiment, the gas collecting ring 7 includes two annular plates fixedly connected to each other. The two annular plates are inclined in the vertical direction, so that the gas collecting ring 7 forms a hopper-shaped structure with a triangular longitudinal section. During the upward movement of the mixed liquid in the inner chamber, it collides with the gas collecting ring 7, and the sludge in the mixed liquid separates from the biogas during the collision; the separated biogas continues to rise with the mixed liquid and finally enters the collection chamber 5 and is discharged; the sludge begins to fall due to the increase in density and falls into the sludge hopper 2 at the bottom.

[0038] A water outlet pipe 8 and a water return pipe 9 are fixedly arranged on the periphery of the water outlet chamber 4. The water outlet end of the water return pipe 9 is connected to the water inlet pipe 10. The horizontal height of the top end of the water outlet chamber 4 is lower than the height of the collection chamber 5. The mixed liquid after separating biogas rises to the top end of the water outlet chamber 4 and then flows into the water outlet chamber 4 and finally flows out through the water outlet pipe 8; when it is detected that there is a certain concentration of sludge remaining in the mixed liquid in the water outlet chamber 4, the mixed liquid flows back to the water inlet pipe 10 through the water return pipe 9 for secondary treatment. Water pumps 19 and electromagnetic valves are arranged on both the water outlet pipe 8 and the water return pipe 9, and the flow direction of the mixed liquid is controlled by switching the on-off of the water pumps 19 and the electromagnetic valves on the water outlet pipe 8 and the water return pipe 9.

[0039] A detection mechanism for detecting the sludge concentration in the mixed liquid is provided in the water outlet chamber 4. The detection mechanism includes two pressure sensors disposed on the inner wall of the water outlet chamber 4. The two pressure sensors are vertically distributed on the inner wall of the water outlet chamber 4. In one embodiment, the height of the first pressure sensor is higher than that of the second pressure sensor. The pressure sensor includes a slider 11 slidably connected to the inner wall of the water outlet chamber 4 in the radial direction of the water outlet chamber 4 and a compression spring 12 connected to the slider 11. Specifically, a chute for accommodating the slider 11 is formed on the inner wall of the water outlet chamber 4. The compression spring 12 is fixedly disposed in the chute, and the compression spring 12 is fixedly connected to the end of the slider 11 for pushing the slider 11 to reset towards the outside of the chute. The end of the slider 11 extending into the water outlet chamber 4 contacts the mixed liquid and moves towards the inside of the chute under the water pressure. A sleeve plate 16 vertically disposed is fixedly provided at the end of the slider 11 located in the chute; in one embodiment, the sleeve plate one of the first pressure sensor extends downward, and the sleeve plate one of the second pressure sensor extends upward.

[0040] A core and a chamber for accommodating the core are also fixedly provided on the inner wall of the water outlet chamber 4. The core includes an insulating cylinder 14 fixed in the chamber and a resistance wire 15 wound around the circumferential side of the insulating cylinder 14. The end portions of the sleeve plate one and the sleeve plate two are respectively sleeved on the insulating cylinder 14. Two metal rods 17 are also fixedly provided in the chamber. The sleeve plate one and the sleeve plate two are respectively connected to the two metal rods 17; the sleeve plate one and the sleeve plate two are both made of metal materials and are respectively electrically connected to the resistance wire 15 and the metal rods 17. Terminal posts are respectively provided at the ends of the first metal rod connected to the sleeve plate one and the second metal rod connected to the sleeve plate two; terminal posts are respectively provided at both ends of the resistance wire 15. The sleeve plate one, the sleeve plate two and the resistance wire 15 form a variable resistor.

[0041] The solenoid valve one on the water outlet pipe 8, the water pump one and the solenoid valve two on the water return pipe 9, and the water pump two are connected to the power supply through a single-pole double-throw switch. Specifically, the single-pole double-throw switch includes an electromagnet and a sliding piece; the electromagnet adsorbs the sliding piece through magnetic force to make it move. A tension spring is fixedly provided on the sliding piece, and the tension spring is used to drive the sliding piece to move away from the electromagnet. Switch fixed pieces are respectively provided on both sides of the sliding piece, and the two switch fixed pieces are arranged in a staggered manner; switch moving pieces are respectively fixedly provided on the two side walls adjacent to the sliding piece towards the electromagnet. When the electromagnet is energized and de-energized, the sliding piece respectively contacts one of the switch fixed pieces. One of the switch fixed pieces is connected in series with the solenoid valve one and the water pump one, and the other switch fixed piece is connected in series with the solenoid valve two and the water pump two; the switch moving piece is connected to the power supply.

[0042] In one embodiment, after the electromagnet is energized, it adsorbs the sliding piece to move towards the electromagnet; after the sliding piece moves, the solenoid valve two and the water pump two are energized, and the solenoid valve one and the water pump one are de-energized; the mixed liquid flows back into the water inlet pipe 10 through the water return pipe 9. After the electromagnet is de-energized, the tension spring drives the sliding piece to reset; after the sliding piece moves, the solenoid valve two and the water pump two are de-energized, and the solenoid valve one and the water pump one are energized, and the mixed liquid flows out through the water outlet pipe 8.

[0043] The electromagnet is connected to the rheostat through a comparator and a relay. Specifically, one terminal of the resistance wire 15 is connected to the positive pole of the power supply, and the other terminal is grounded. The terminal of the first metal rod is connected to a fixed resistor, and the other end of the fixed resistor is connected to the power supply; the terminal of the second metal rod is connected to the non-inverting input terminal of the comparator; the inverting input terminal of the comparator is connected to a reference voltage, and the output terminal is connected to the relay coil. The electromagnet is connected to the normally open contact of the relay. In the above circuit, when the resistance value of the rheostat increases, the voltage division increases; when the voltage division exceeds the reference voltage of the comparator, the comparator outputs a high level to the relay, and the relay controls the electromagnet to be energized.

[0044] Specifically, the slider 11 contracts towards the inside of the chute under the action of water pressure. Since the height difference between the two sliders 11 is fixed, when the liquid level height in the water outlet chamber 4 changes, the contraction distances of the sliders 11 towards the inside of the chute are equal; that is, when the density change in the water outlet chamber 4 is small, the distance change between the two sliding plates is within a very small range difference, and the resistance value change of the rheostat is small. When the sludge content in the mixed liquid in the water outlet chamber 4 increases, the density of the mixed liquid increases, resulting in an increase in the distance between the two sliding plates and an increase in the resistance value of the rheostat. When the resistance value of the rheostat increases to the voltage division exceeding the reference voltage, the electromagnet is energized; the mixed liquid stops flowing towards the water outlet pipe 8 and instead flows into the water inlet pipe 10 through the return pipe 9 for secondary treatment. Preferably, the elastic coefficients of the compression springs 12 connecting the two sliders 11 are equal, so that when the sliders 11 are under the action of the same water pressure, the displacement distances towards the inside of the chute are equal.

[0045] To reduce the interference of uneven sludge distribution in the water flow, a stirring structure is provided at the top of the water outlet chamber 4. The stirring structure includes a support shaft 18 at the axis of the water outlet chamber 4 and a plurality of dispersion blades 13 evenly distributed along the circumferential direction of the support shaft 18; the other ends of the dispersion blades 13 are fixedly connected to the inner circumferential surface of the water outlet chamber 4. The dispersion blades 13 form an angle greater than 0° and less than 180° with the horizontal direction, so as to form a liquid flow channel between the two dispersion blades 13. The mixed liquid forms a vortex after flowing into the water outlet chamber 4 through the liquid flow channel. Preferably, the rheostat is arranged in the middle of the water outlet chamber 4 to reduce the influence of the vortex shear force on the slider 11.

[0046] In one embodiment, multiple sets of rheostats are provided, and the multiple sets of rheostats are circumferentially distributed on the inner wall of the water outlet chamber 4 at the same horizontal height along the water outlet chamber 4. The output terminals of multiple comparators are respectively connected to diodes. The cathodes of the diodes are connected to the comparators, and the anodes of the multiple diodes are connected to a common node. A pull-up resistor is provided, with one end connected to the power supply and the other end connected to the common node. A single relay is provided, with one end of the relay coil connected to the common node and the other end grounded. The multiple comparators are connected to the same reference voltage. When the voltage divisions of the multiple rheostats are all greater than the reference voltage, the multiple comparators respectively output high levels to turn off the diodes; the common node is pulled to a high level by the pull-up resistor, and the main relay coil is energized, and the relay controls the electromagnet to be energized. When the voltage division of a single rheostat does not reach the reference voltage, a single comparator outputs a low level to turn on the diode, the common node is pulled to a low level, and the relay does not work. The above circuit can effectively prevent the influence of water flow shear force on the slider 11. When the resistance values of several rheostats all increase to the range values, the relay controls the electromagnet to be energized.

[0047] The above are all the preferred embodiments of the present application, and the protection scope of the present application is not limited thereby. Therefore, all equivalent changes made according to the structure, shape, and principle of the present application should be covered within the protection scope of the present application.

Claims

1. An anaerobic treatment device for breeding manure sewage, comprising a separation tower, characterized in that, The separation tower includes: An effluent chamber, which is arranged inside the separation tower, and the clear water after separating sludge flows into the effluent chamber; An outlet pipe and a return pipe, both of which are connected to the effluent chamber; a water flow power mechanism is arranged on both the outlet pipe and the return pipe; A single-pole double-throw switch, an electromagnet is arranged inside the single-pole double-throw switch, and after the electromagnet is turned on and off, the on and off of the water flow power mechanism of the outlet pipe and the return pipe are switched; A slider and a compression spring, both of which are arranged on the inner wall of the effluent chamber; the compression spring is fixedly connected to the slider; the end of the slider moves under the action of water pressure; there are no less than two sliders and compression springs; A rheostat, which is connected to the electromagnet and controls the on and off of the electromagnet; the slider is slidably connected to the rheostat for adjusting the resistance value of the rheostat.

2. The anaerobic treatment device for breeding manure according to claim 1, wherein: The water flow power mechanism includes a water pump and a solenoid valve arranged on the outlet pipe and the return pipe.

3. A device for anaerobic treatment of breeding manure sewage according to claim 1 or 2, characterized in that: The single-pole double-throw switch further includes: A sliding piece, the electromagnet magnetically adsorbs to move the sliding piece; A switch moving piece and a switch fixed piece, two switch moving pieces are fixedly arranged on the sliding piece; two switch fixed pieces are respectively arranged on both sides of the sliding piece; after the sliding piece moves, the switch moving piece on one side is in electrical contact with the switch fixed piece; the switch moving piece is connected to the power supply, and the switch fixed piece is electrically connected to the water flow power mechanism; A tension spring, which is fixedly connected to the sliding piece.

4. A device for anaerobic treatment of breeding manure sewage according to claim 1, characterized in that, The rheostat includes: An insulating cylinder, a resistance wire is wound around the circumference of the insulating cylinder; A sleeve plate, one end is fixedly connected to the slider, and the other end is slidably connected to the insulating cylinder; A metal rod, the sleeve plate is slidably connected to the metal rod; the sleeve plate is electrically connected to the resistance wire and the metal rod respectively.

5. A device for anaerobic treatment of breeding manure sewage according to claim 1, characterized in that: A water inlet pipe is fixedly connected to the separation tower; the return pipe is connected to the water inlet pipe.

6. The anaerobic treatment device for breeding manure according to claim 1, characterized in that: The electromagnet is connected to the rheostat through a comparator and a relay.

7. The anaerobic treatment device for breeding manure according to claim 1, characterized in that: A mud hopper is arranged at the bottom of the separation tower; the mud hopper includes a hopper groove; the vertical side wall of the hopper groove is inclined.

8. The anaerobic treatment device for breeding manure according to claim 1, characterized in that: A three-phase separator is arranged inside the separation tower; a collection chamber is fixedly arranged at the top of the separation tower.

9. The anaerobic treatment device for breeding manure according to claim 8, characterized in that: The three-phase separator includes a plurality of gas collecting rings arranged alternately; the gas collecting ring includes two annular plates fixedly connected to each other and inclined.

10. A method for anaerobic treatment of breeding manure sewage, characterized in that Using the separation tower described in claims 1-9 to treat the mixed liquid containing sludge and discharging clear water and biogas.

Images