CN117088517B

CN117088517B - Biological purification device

Info

Publication number: CN117088517B
Application number: CN202311134412.XA
Authority: CN
Inventors: 许桥清; 许宿县; 许辉
Original assignee: Guangzhou Haohan Biotechnology Co ltd
Current assignee: Guangzhou Haohan Biotechnology Co ltd
Priority date: 2023-09-04
Filing date: 2023-09-04
Publication date: 2024-01-26
Anticipated expiration: 2043-09-04
Also published as: CN117088517A

Abstract

The invention provides a biological purification device which comprises a first anoxic tank, a second anoxic tank and an aeration tank which are sequentially arranged and communicated from outside to inside, wherein activated sludge is arranged in the first anoxic tank, an inflator pump which extends vertically is arranged in the aeration tank, a filler is arranged between the outer side wall of the inflator pump and the inner side wall of the aeration tank, the bottom end of the inflator pump is communicated with an aeration head, a first piston head is connected in a sliding manner in the inflator pump, a first non-return ring is sleeved on the first piston head, the first non-return ring can limit fluid to flow from bottom to top, the first piston head is connected with a lifting power mechanism, and the lifting power mechanism can drive the first piston head to reciprocate up and down in the inflator pump. The invention can effectively purify the sewage generated by the modulated water pond.

Description

Biological purification device

Technical Field

The invention relates to the technical field of sewage treatment, in particular to a biological purification device.

Background

In the field of aquatic product management technology, "water regulation", also known as "hanging" refers to the movement of certain aquatic products, such as fish, after they grow to a certain extent, to a water regulating tank where they swim. During the period, no food such as feed, grass, bait and the like is provided, and no medicament is added, so that the weight of the aquatic product is reduced, the fat content of the aquatic product is reduced, the meat quality of the aquatic product is firmer, and the fishy smell is reduced.

However, after a long period of use, the water in the tempering tank can be contaminated with metabolites of the aquatic products. In order to ensure healthy growth of aquatic products in the water mixing tank, sewage generated by the water mixing tank needs to be replaced regularly. However, since sewage produced in the water regulating tank contains a large amount of organic matters, if the sewage is directly discharged into natural water such as river, lake, sea, etc. without any treatment, eutrophication of the natural water area is caused, so that ecological unbalance of the natural water area is destroyed. In view of this, it is necessary to take appropriate measures to purify the sewage generated in the water conditioning tank to prevent its adverse effect on the ecological environment.

Disclosure of Invention

In order to overcome the defects in the prior art, the invention provides a biological purification device which can effectively purify sewage generated by a sewage pool.

The invention adopts the following technical scheme.

The utility model provides a biological purification device, includes from outside to interior first anoxic tank, second anoxic tank and the aeration tank that set gradually and communicate, be equipped with activated sludge in the first anoxic tank, be equipped with along the inflator of vertical to extension in the aeration tank, be equipped with the filler between the lateral wall of inflator and the inside wall of aeration tank, the bottom intercommunication of inflator has the aeration head, the interior sliding connection of inflator has first piston head, first piston has cup jointed first non-return ring on the head, first non-return ring can restrict fluid from flowing upwards from down, first piston head is connected with lifting power mechanism, lifting power mechanism can drive first piston head in the inflator and reciprocate from top to bottom.

Further, the lifting power mechanism comprises an electric push rod, and a transmission shaft of the electric push rod is integrally connected with the first piston head.

Further, the outside cover of inflator pump is equipped with the support barrel, run through on the support barrel and have a plurality of holes that permeate water, the lateral wall of support barrel is covered with reverse osmosis membrane, form the water purification chamber between the lateral wall of the inside wall of support barrel and inflator pump.

Further, the filler is porous polyurethane sponge filler, the filler is abutted against the reverse osmosis membrane, and the lifting power mechanism can compress the filler.

Further, the top of supporting cylinder is integrally connected with the water pumping cylinder, form the water pumping chamber between the inside wall of water pumping cylinder and the lateral wall of inflator pump, sliding connection has the second piston head in the water pumping chamber, second piston head and first piston head integral connection, second piston overhead has cup jointed the second and has stopped contrary ring, the second is stopped contrary ring and can be restricted fluid from the top down flow, the lateral wall of water pumping cylinder runs through there is the wash port.

Further, the second piston head is also sleeved with a blocking ring, the blocking ring is positioned above the second non-return ring, and the drain hole is positioned in the stroke of the blocking ring.

Further, the top of the aeration tank is slidably connected with an extrusion plate, an exhaust hole penetrates through the extrusion plate, the first piston head is integrally connected with a transmission plate, the transmission plate can seal the exhaust hole and drive the extrusion plate to move downwards, the extrusion plate is connected with an elastic piece, and the elastic piece enables the extrusion plate to keep a trend of moving upwards;

the top of first oxygen-deficient pond is through first inlet channel and second oxygen-deficient pond intercommunication, the bottom of second oxygen-deficient pond is through second inlet channel and aeration tank intercommunication, the one end that the second inlet channel is close to the aeration tank is equipped with the filter, the intercommunication has first runner that returns between second inlet channel and the first oxygen-deficient pond, first runner that returns is tangent with first oxygen-deficient pond, the one end that the first runner that returns is close to first oxygen-deficient pond is equipped with first check, the one end that the second inlet channel is close to the second oxygen-deficient pond is equipped with the second check, first check can restrict fluid from first oxygen-deficient pond inflow first runner that returns, the second check can restrict fluid from second inlet channel inflow second oxygen-deficient pond.

Further, the outside of stripper plate is connected with along the pressurized-water section of thick bamboo of vertical extension, form the pressurized-water chamber between the lateral wall of pressurized-water section of thick bamboo and the inside wall of aeration tank, the lateral wall of aeration tank runs through the second runner that returns that has intercommunication pressurized-water chamber and second oxygen deficiency pond, be equipped with annular baffle in the second oxygen deficiency pond, the bottom of baffle is equipped with the runner.

Further, the elastic piece is an air bag penetrating through the filler, the bottom end of the elastic piece abuts against the aeration tank, and the top end of the elastic piece abuts against the extrusion plate.

The beneficial effects of the invention are as follows:

when the sewage treatment device is operated, sewage generated by the water regulating tank sequentially flows through the first anoxic tank, the second anoxic tank and the aeration tank.

In the first anoxic tank, microorganisms on the activated sludge are responsible for decomposing organic matters in the sewage and converting the organic matters into simple organic acids, methane and the like, thereby reducing the load of the organic matters in the sewage.

In the second anoxic tank, the microorganisms in the sewage are subjected to denitrification reaction to reduce nitrate nitrogen into nitrogen gas, so that nitrogen removal is realized, and the nitrogen compound content in the sewage is reduced.

In the aeration tank, the lifting power mechanism drives the first piston head to reciprocate up and down in the inflator pump, and the external air is pressed into the aeration head through the action of the first non-return ring, so that the external air is mixed into sewage through the aeration head, the oxygen content of the sewage is improved, the residual organic matters and nitrogen compounds in the sewage are favorably oxidized by microorganisms in the sewage, and the organic matters and nitrogen compounds are decomposed into relatively stable products such as water, nitrogen, carbon dioxide and the like.

In addition, the aeration tank is also provided with a filler, and the filler not only can break up bubbles generated by the aeration head, so that air and sewage are fully mixed, but also can provide attachment and growth positions for microorganisms in the aeration tank, and is beneficial to complete decomposition of residual organic matters and nitrogen compounds in the sewage.

In summary, the invention can effectively purify sewage generated by the sewage pool.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described, and it will be obvious to those skilled in the art that other drawings can be obtained according to these drawings without inventive effort.

FIG. 1 is a schematic view of the whole structure of the present embodiment (the extrusion plate is at the highest point of its own stroke);

fig. 2 is an enlarged view of a portion a of fig. 1;

FIG. 3 is a B-B cross-sectional view of FIG. 1;

fig. 4 is a second schematic diagram of the overall structure of the present embodiment (where the extrusion plate is at the lowest point of its own stroke).

Reference numerals illustrate:

a first anoxic tank 11, a second anoxic tank 12, an aeration tank 13, a filter 14, a first check member 15, a second check member 16, a partition 17,

a first water inlet channel 1a, a second water inlet channel 1b, a first return channel 1c, a second return channel 1d, a through channel 1e,

the amount of activated sludge 111, filler 131,

inflator 21, aerator 22, first piston head 23, first check ring 24,

the lifting power mechanism 3 is arranged on the upper part of the lifting power mechanism,

the support cylinder 41, the water permeable hole 41a, the reverse osmosis membrane 42,

the water pumping tube 51, the water discharging hole 51a, the second piston head 52, the second non-return ring 53, the blocking ring 54,

the pressing plate 61, the exhaust hole 61a, the driving plate 62, the elastic member 63, the pressurized water cylinder 64,

a water purifying cavity 4a, a water pumping cavity 5a and a water pressing cavity 6a.

Detailed Description

The drawings are for illustrative purposes only and are not to be construed as limiting the present patent; for the purpose of better illustrating the present embodiment, certain elements of the drawings may be omitted, enlarged or reduced and do not represent the actual product dimensions.

It will be appreciated by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted. The technical scheme of the invention is further described below with reference to the accompanying drawings and examples.

The biological purification device comprises a first anoxic tank 11, a second anoxic tank 12 and an aeration tank 13 which are sequentially arranged and communicated from outside to inside, wherein activated sludge 111 is arranged in the first anoxic tank 11, an inflator pump 21 which extends vertically is arranged in the aeration tank 13, a filler 131 is arranged between the outer side wall of the inflator pump 21 and the inner side wall of the aeration tank 13, the bottom end of the inflator pump 21 is communicated with an aerator 22, a first piston head 23 is connected in the inflator pump 21 in a sliding manner, a first check ring 24 is sleeved on the first piston head 23, the first check ring 24 can limit fluid to flow from bottom to top, the first piston head 23 is connected with a lifting power mechanism 3, and the lifting power mechanism 3 can drive the first piston head 23 to reciprocate up and down in the inflator pump 21.

In operation, sewage generated by the water regulating tank flows through the first anoxic tank 11, the second anoxic tank 12 and the aeration tank 13 in sequence.

In the first anoxic tank 11, microorganisms on the activated sludge are responsible for decomposing organic matters in the sewage, converting them into simple organic acids, methane, etc., thereby reducing the load of organic matters in the sewage.

In the second anoxic tank 12, the microorganisms in the sewage undergo denitrification reaction to reduce nitrate nitrogen into nitrogen gas, thereby realizing nitrogen removal and reducing the nitrogen compound content in the sewage.

In the aeration tank 13, the lifting power mechanism 3 drives the first piston head 23 to reciprocate up and down in the inflator pump 21, and through the first non-return effect, external air is pressed into the aeration head 22, so that the external air is mixed into sewage through the aeration head 22, the oxygen content of the sewage is improved, and the sewage is beneficial to the microorganism in the sewage to oxidize organic matters and nitrogen compounds remained in the sewage, and the organic matters and nitrogen compounds are decomposed into water, nitrogen, carbon dioxide and other relatively stable products. Specifically, in the process that the lifting power mechanism 3 drives the first piston head 23 to move upwards, external air enters the lower part of the first piston head 23 through the first non-return ring 24. In the process of driving the first piston head 23 to move downwards by the lifting power mechanism 3, the air below the first piston head 23 cannot flow to the outside of the inflator 21 through the first check ring 24 because the first check ring 24 restricts the air from flowing upwards from below, so that the first piston head 23 presses the air below the first piston head into the aerator 22.

In addition, the filler 131 is arranged between the outer side wall of the inflator pump 21 and the inner side wall of the aeration tank 13, so that bubbles generated by the aeration head 22 can be scattered, air and sewage can be fully mixed, adhesion and growth positions can be provided for microorganisms in the aeration tank 13, and complete decomposition of residual organic matters and nitrogen compounds in the sewage can be facilitated.

Preferably, the lifting power mechanism 3 comprises an electric push rod, and a transmission shaft of the electric push rod is integrally connected with the first piston head 23.

As another example, the lifting power mechanism 3 includes a motor, a crankshaft is connected to the motor in a driving manner, a piston rod is integrally connected to the top end of the first piston head 23, and a transmission rod is hinged to the piston rod and is hinged to an eccentric portion of the crankshaft.

When the inflator pump is in operation, the motor drives the crankshaft to rotate, and the first piston head 23 reciprocates up and down in the inflator pump 21 under the coordination of the transmission rod and the piston rod.

It will be appreciated that subsequent treatment of the wastewater is not appropriate until the microorganisms have completed chemical conversion. However, the microorganism takes a certain time to complete the chemical conversion. Before the microorganisms in the sewage finish chemical conversion, the subsequent sewage treatment equipment needs to be stopped for waiting, which makes the continuity of the whole sewage treatment flow worse, thereby affecting the sewage treatment efficiency.

To solve this problem, a support tube 41 is sleeved on the outer side of the inflator 21, a plurality of water permeable holes 41a are perforated on the support tube 41, a reverse osmosis membrane 42 is covered on the outer side wall of the support tube 41, and a water purifying cavity 4a is formed between the inner side wall of the support tube 41 and the outer side wall of the inflator 21. Specifically, the reverse osmosis membrane 42 is capable of intercepting dissolved substances in the sewage and allowing water molecules to pass therethrough, thereby trapping organic matters in the sewage outside the reverse osmosis membrane 42. The organic matter trapped outside the reverse osmosis membrane 42 can be continuously converted by microorganisms, and the purified water flowing into the purified water chamber 4a can be subjected to subsequent treatment. Thus, the subsequent sewage treatment equipment does not need to stop for waiting for microorganisms in the sewage to finish chemical conversion, and the continuity and efficiency of the whole sewage treatment flow are improved.

It can be understood that, during the process of filtering sewage by the reverse osmosis membrane 42, impurities adhere to the outer surface of the reverse osmosis membrane 42, the filtering effect of the reverse osmosis membrane 42 is affected by light weight, and the reverse osmosis membrane 42 is blocked by heavy weight. To solve this problem, the packing 131 is a porous polyurethane sponge packing, the packing 131 is abutted against the reverse osmosis membrane 42, and the lifting power mechanism 3 can compress the packing 131. In the process of driving the first piston head 23 to reciprocate up and down in the inflator 21, the lifting power mechanism 3 compresses the packing 131, so that the packing 131 deforms, friction is generated between the packing 131 and the reverse osmosis membrane 42, and impurities attached to the reverse osmosis membrane 42 are scraped off. In addition, the lifting power mechanism 3 deforms the packing 131 under pressure, which is also advantageous in preventing the packing 131 from hardening.

Preferably, the top end of the supporting cylinder 41 is integrally connected with a water pumping cylinder 51, a water pumping cavity 5a is formed between the inner side wall of the water pumping cylinder 51 and the outer side wall of the inflator 21, a second piston head 52 is slidably connected in the water pumping cavity 5a, the second piston head 52 is integrally connected with the first piston head 23, a second non-return ring 53 is sleeved on the second piston head 52, the second non-return ring 53 can limit fluid to flow from top to bottom, and a drain hole 51a penetrates through the side wall of the water pumping cylinder 51. Specifically, the lifting power mechanism 3 drives the second piston head 52 to reciprocate up and down along the water pumping cavity 5a in the process of driving the first piston head 23 to reciprocate up and down in the inflator 21. During the process that the lifting power mechanism 3 drives the second piston head 52 to move downwards, purified water below the second piston head 52 enters the upper part of the second piston head 52 through the second non-return ring 53. In the process of driving the second piston head 52 to move upwards by the lifting power mechanism 3, the second non-return ring 53 limits the flow of the purified water from top to bottom, so that the purified water above the second piston head 52 is lifted by the second piston head 52 and finally flows away through the drain hole 51a.

It should be noted that, the first check ring 24 and the second check ring 53 are elastic rings with V-shaped cross-cut profile, and this type of elastic ring is not further described in this specification, but does not affect the understanding and implementation of the technical solutions of this specification by those skilled in the art, since it is well known to those skilled in the art.

Preferably, the second piston head 52 is further sleeved with a blocking ring 54, the blocking ring 54 is located above the second non-return ring 53, and the drain hole 51a is located in the stroke of the blocking ring 54. It can be appreciated that, in the process of the lifting power mechanism 3 driving the second piston head 52 to move downwards, after the plugging ring 54 passes over the drain hole 51a, the plugging ring 54 and the second piston head 52 will apply pressure to the purified water in the purified water cavity 4a, so that the purified water in the purified water cavity 4a flows from the inner side of the reverse osmosis membrane 42 to the outer side of the reverse osmosis membrane 42, so as to implement back flushing of the reverse osmosis membrane 42.

Preferably, the top of the aeration tank 13 is slidably connected with an extrusion plate 61, the extrusion plate 61 is penetrated with an exhaust hole 61a, the first piston head 23 is integrally connected with a transmission plate 62, the transmission plate 62 can seal the exhaust hole 61a and drive the extrusion plate 61 to move downwards, the extrusion plate 61 is connected with an elastic piece 63, and the elastic piece 63 keeps the extrusion plate 61 in an upward movement trend;

the top of the first anoxic tank 11 is communicated with the second anoxic tank 12 through a first water inlet channel 1a, the bottom of the second anoxic tank 12 is communicated with the aeration tank 13 through a second water inlet channel 1b, a filter element 14 is arranged at one end, close to the aeration tank 13, of the second water inlet channel 1b, a first return channel 1c is communicated between the second water inlet channel 1b and the first anoxic tank 11, the first return channel 1c is tangential to the first anoxic tank 11, a first check element 15 is arranged at one end, close to the first anoxic tank 11, of the first return channel 1c, a second check element 16 is arranged at one end, close to the second anoxic tank 12, of the second water inlet channel 1b, the first check element 15 can limit fluid from flowing into the first return channel 1c from the first anoxic tank 11, and the second check element 16 can limit fluid from flowing into the second anoxic tank 12 from the second water inlet channel 1 b.

It should be noted that, the first check member 15 and the second check member 16 are tapered valves, and since this type of valve is well known to those skilled in the art, the present disclosure does not further describe the valve, but does not affect the understanding and implementation of the technical solution of the present disclosure.

Specifically, the lifting power mechanism 3 drives the driving plate 62 to reciprocate up and down in the process of driving the first piston head 23 to reciprocate up and down in the inflator 21. In the first half path of the downward movement of the first piston head 23, the first piston head 23 presses air into the aeration head 22 so that the air is mixed into the sewage through the aeration head 22, and the driving plate 62 is not in contact with the pressing plate 61, and the air not dissolved into the sewage is discharged through the exhaust hole 61 a. In the latter half path of the downward movement of the first piston head 23, the driving plate 62 abuts against the pressing plate 61 and drives the pressing plate 61 to move downward, pressure is applied to the sewage in the aeration tank, and the sewage flowing from the second water inlet channel 1b into the second anoxic tank 12 is restricted by the second check member 16 because the exhaust hole 61a at this time is blocked by the driving plate 62, so that the sewage at the bottom of the aeration tank enters the first anoxic tank 11 through the first return channel 1 c.

It can be understood that although the top end of the first anoxic tank 11 is communicated with the second anoxic tank 12 through the first water inlet channel 1a, the activated sludge in the first anoxic tank 11 can be prevented from entering the second anoxic tank 12 to a certain extent, and part of the activated sludge in the first anoxic tank 11 still enters the second anoxic tank 12 through the first water inlet channel 1a under the driving of water flow and finally adheres to the filter element 14 in the second water inlet channel 1 b. In the process that sewage in the aeration tank enters the first anoxic tank 11 through the first return flow channel 1c, the sewage flowing through the first return flow channel 1c can bring the activated sludge attached to the filter element 14 into the first anoxic tank 11 again, so that the recirculation of the activated sludge in the aeration tank 13 is realized, the back flushing of the filter element 14 can be carried out, and the filter element 14 is prevented from being blocked.

The first return flow channel 1c is tangential to the first anoxic tank 11, and the water flow flowing back through the first return flow channel 1c drives the sewage in the first anoxic tank 11 to flow, so that the activated sludge at the bottom of the first anoxic tank 11 is rolled up, and the activated sludge can be fully contacted with the sewage in the first anoxic tank 11.

In addition, the sewage at the top of the aeration tank 13 flows from top to bottom under the drive of the extrusion plate 61, and the filler 131 can be backwashed, so that the filler 131 is prevented from being blocked. When the pressing plate 61 is at the lowest point of its own stroke, the packing 131 is compressed by the pressing plate 61.

When the first piston head 23 moves upward, the elastic member 63 pushes the pressing plate 61 upward, and the pressing plate 61 returns to the initial position.

Preferably, the outside of the extrusion plate 61 is connected with a water pressing cylinder 64 extending vertically, a water pressing cavity 6a is formed between the outer side wall of the water pressing cylinder 64 and the inner side wall of the aeration tank 13, the side wall of the aeration tank 13 is penetrated with a second flow returning channel 1d which is communicated with the water pressing cavity 6a and the second anoxic tank 12, an annular partition plate 17 is arranged in the second anoxic tank 12, and the bottom end of the partition plate 17 is provided with a flow passing channel 1e. It will be appreciated that in the latter half of the path of the downward movement of the first piston head 23, the drive plate 62 abuts against the compression plate 61 and drives the compression plate 61 downward, exerting pressure on the sewage in the aeration tank. Because the exhaust hole 61a is blocked by the transmission plate 62 at this time, the sewage at the bottom of the aeration tank 13 is caused to reflow to the first anoxic tank 11 through the first return flow passage 1c, thereby realizing reflow of the activated sludge in the aeration tank 13; and, the sewage at the top of the aeration tank 13 is caused to enter the pressurized water chamber 6a and finally re-flows to the second anoxic tank 12 through the second return flow passage 1d, thereby realizing the re-flow of the nitrified liquid in the aeration tank 13.

Preferably, the elastic member 63 is an air bag penetrating through the packing 131, the bottom end of the elastic member 63 abuts against the aeration tank 13, and the top end of the elastic member 63 abuts against the pressing plate 61. It can be understood that when the pressing plate 61 is at the lowest point of its own stroke, the air bag is pressed by the pressing plate 61 in the vertical direction to expand in the horizontal direction, so that the packing 131 is deformed in the horizontal direction, which is more advantageous in preventing the packing 131 from hardening than the packing 131 from being deformed in the vertical direction only by the pressing plate 61.

The following is the operation mechanism of the present embodiment:

In the aeration tank 13, the lifting power mechanism 3 drives the first piston head 23 to reciprocate up and down in the inflator 21, wherein:

1) In the first half path of the downward movement of the first piston head 23, the first piston head 23 presses air into the aeration head 22, so that the air is mixed into sewage through the aeration head 22, the oxygen content of the sewage is increased, and the sewage is beneficial to the oxidation of residual organic matters and nitrogen compounds in the sewage by microorganisms and the decomposition of the organic matters and nitrogen compounds into water, nitrogen, carbon dioxide and other stable products. Also, in the first half path of the downward movement of the first piston head 23, the driving plate 62 is not in contact with the pressing plate 61, and air not dissolved in the sewage is discharged through the exhaust hole 61 a.

1) In the latter half of the path of the downward movement of the first piston head 23, the first piston head 23 then forces air into the aerator 22. In addition, the transmission plate 62 abuts against the extrusion plate 61 and drives the extrusion plate 61 to move downwards, so that pressure is applied to sewage in the aeration tank 13, and as the exhaust hole 61a is blocked by the transmission plate 62 and the second check piece 16 limits sewage from flowing into the second anoxic tank 12 from the second water inlet channel 1b, sewage at the bottom of the aeration tank enters the first anoxic tank 11 through the first return channel 1c, and the double flow of activated sludge in the aeration tank 13 is realized; and enabling the sewage at the top of the aeration tank 13 to enter the pressurized water cavity 6a and finally to reflow to the second anoxic tank 12 through the second return flow channel 1d, thereby realizing reflow of the nitrified liquid in the aeration tank 13. And, the pressing plate 61 compresses the packing 131 during the downward movement, causing the packing 131 to be deformed, thereby advantageously preventing the packing 131 from hardening. Also, when the packing 131 is deformed in the vertical direction, friction is generated with the reverse osmosis membrane 42, thereby scraping off impurities attached to the reverse osmosis membrane 42, which is advantageous in preventing the reverse osmosis membrane 42 from being blocked.

Further, since the second piston head 52 is integrally connected with the first piston head 23, the second piston head 52 moves downward following the first piston head 23. During the downward movement of the second piston head 52, when the drain hole 51a is located between the second non-return ring 53 and the blocking ring 54, the downward movement of the second piston head 52 will cause the clean water below the second piston head 52 to enter the upper side of the second piston head 52 through the second non-return ring 53; after the plugging ring 54 passes over the drain hole 51a, the plugging ring 54 and the second piston head 52 exert pressure on the purified water in the purified water cavity 4a, so that the purified water in the purified water cavity 4a flows from the inner side of the reverse osmosis membrane 42 to the outer side of the reverse osmosis membrane 42, and the reverse osmosis membrane 42 is backwashed.

3) During the upward movement of the first piston head 23, the outside air enters under the first piston head 23 through the first check ring 24; and, since the second non-return ring 53 restricts the flow of the purified water from the top down, the purified water above the second piston head 52 is lifted up by the second piston head 52 and finally flows away through the drain hole 51a, thereby realizing the discharge of the purified water.

Therefore, the sewage can be aerated only through the up-and-down reciprocating motion of the lifting power mechanism, the packing is prevented from hardening, impurities on the reverse osmosis membrane are scraped, the reverse osmosis membrane is backwashed, and purified water is discharged, so that the sewage treatment device has the advantages of being compact in structure and strong in functionality.

It is to be understood that the above examples of the present invention are provided by way of illustration only and not by way of limitation of the embodiments of the present invention. Other variations or modifications of the above teachings will be apparent to those of ordinary skill in the art. It is not necessary here nor is it exhaustive of all embodiments. Any modification, equivalent replacement, improvement, etc. which come within the spirit and principles of the invention are desired to be protected by the following claims.

Claims

1. The biological purification device is characterized by comprising a first anoxic tank, a second anoxic tank and an aeration tank which are sequentially arranged and communicated from outside to inside, wherein activated sludge is arranged in the first anoxic tank, an inflator pump which extends vertically is arranged in the aeration tank, a filler is arranged between the outer side wall of the inflator pump and the inner side wall of the aeration tank, the bottom end of the inflator pump is communicated with an aeration head, a first piston head is connected in the inflator pump in a sliding manner, a first non-return ring is sleeved on the first piston head, the first non-return ring can limit fluid to flow from bottom to top, and the first piston head is connected with a lifting power mechanism which can drive the first piston head to reciprocate up and down in the inflator pump;

the outer side of the inflator pump is sleeved with a supporting pump, a plurality of water permeable holes penetrate through the supporting pump, the outer side wall of the supporting pump is covered with a reverse osmosis membrane, and a water purifying cavity is formed between the inner side wall of the supporting pump and the outer side wall of the inflator pump;

the top end of the supporting cylinder is integrally connected with a water pumping cylinder, a water pumping cavity is formed between the inner side wall of the water pumping cylinder and the outer side wall of the inflator pump, a second piston head is connected in the water pumping cavity in a sliding manner, the second piston head is integrally connected with the first piston head, a second non-return ring is sleeved on the second piston head and can limit fluid to flow downwards from top to bottom, and a drain hole penetrates through the side wall of the water pumping cylinder;

the top of the aeration tank is connected with an extrusion plate in a sliding manner, an exhaust hole penetrates through the extrusion plate, the first piston head is integrally connected with a transmission plate, the transmission plate can seal the exhaust hole and drive the extrusion plate to move downwards, the extrusion plate is connected with an elastic piece, and the elastic piece enables the extrusion plate to keep a trend of moving upwards;

the top end of the first anoxic tank is communicated with the second anoxic tank through a first water inlet channel, the bottom end of the second anoxic tank is communicated with the aeration tank through a second water inlet channel, a filter element is arranged at one end of the second water inlet channel, which is close to the aeration tank, a first return flow channel is communicated between the second water inlet channel and the first anoxic tank, the first return flow channel is tangential to the first anoxic tank, a first check element is arranged at one end of the first return flow channel, which is close to the first anoxic tank, a second check element is arranged at one end of the second water inlet channel, which is close to the second anoxic tank, and the first check element can limit fluid from flowing into the first return flow channel from the first anoxic tank, and the second check element can limit fluid from flowing into the second anoxic tank from the second water inlet channel;

the outside of stripper plate is connected with along the pressurized-water section of thick bamboo of vertical extension, form the pressurized-water chamber between the lateral wall of pressurized-water section of thick bamboo and the inside wall of aeration tank, the lateral wall of aeration tank runs through the second runner that returns that has intercommunication pressurized-water chamber and second oxygen deficiency pond, be equipped with annular baffle in the second oxygen deficiency pond, the bottom of baffle is equipped with the runner.

2. The biological purification apparatus of claim 1, wherein the lifting power mechanism comprises an electric pushrod, and wherein a drive shaft of the electric pushrod is integrally connected to the first piston head.

3. The biological purification device of claim 1, wherein the packing is a porous polyurethane sponge packing, the packing is abutted against a reverse osmosis membrane, and the lifting power mechanism can compress the packing.

4. The biological purification device of claim 1, wherein the second piston head is further sleeved with a plugging ring, the plugging ring is located above the second non-return ring, and the drain hole is located in the stroke of the plugging ring.

5. The biological purification apparatus of claim 1, wherein the elastic member is an air bag passing through the packing, the bottom end of the elastic member abuts against the aeration tank, and the top end of the elastic member abuts against the extrusion plate.