CN218869127U - Pond desilting changes end clarification plant - Google Patents

Abstract

The utility model discloses a pond desilting changes end clarification plant relates to sewage treatment technical field, include: the aeration device is used for introducing gas to the bottom of the fish pond to stir the sludge and water at the bottom of the fish pond, and the aeration output end of the aeration device is positioned in the fish pond; the sewage pumping device is used for pumping muddy sewage containing sludge, and the water inlet end of the sewage pumping device is placed in the fishpond and is positioned beside the aeration output end of the aeration device; and the purification device is used for purifying the sewage extracted by the sewage extraction device. The utility model discloses in, aeration equipment lets in gaseous silt and the water that stirs the pond bottom to the pond bottom, and sewage extraction device will stir the sewage that contains silt again and extract, and purifier carries out purification treatment to the sewage that sewage extraction device extracted again, and it extracts the clearance to the silt of pond bottom, purifies the bottom of pond, has improved the bottom environment of pond, and then has improved the quality of water of pond, has improved the effect of breeding fish of pond.

Description

Purification equipment for dredging and bottom-changing of fishpond

Technical Field

The utility model relates to a sewage treatment technical field, more specifically say and relate to a pond desilting changes end clarification plant.

Background

The fishpond refers to a place for catching or culturing fish, in particular to an internal compartment of the fishpond or a purse net for enclosing the fish. The general ideal fishpond has the advantages of large required area, deep pond water, full illumination, smooth water source, fertile water quality and convenient traffic, is favorable for the growth of fishes and the improvement of yield, and is favorable for production management.

After the fish shoals are cultured in the fishpond, the quality of water in the fishpond needs to be concerned, when the growth of the fish shoals is damaged by water pollution, people need to timely perform sewage treatment on the water in the fishpond, otherwise, the health of the fish shoals can be damaged by long-time pollution of the water. Therefore, in the fishpond culture technology in China, the standardization of water quality is very important, and a special sewage treatment device is required to be adopted to treat sewage.

In the prior art, a patent with publication number CN216191677U discloses a fishpond culture sewage recycling treatment system, which relates to the technical field of culture sewage treatment and comprises a sewage pump, a flocculant metering pump, an ozone generator, a flocculant tank, a settling tank and a tail tank; a water inlet of the sewage pump is connected with a first pipeline, the first pipeline is connected to the breeding sewage, and a water outlet of the sewage pump is connected with a second pipeline; the inlet end of the flocculating agent metering pump is connected with a third pipeline, the third pipeline is connected into a flocculating agent tank, the outlet end of the flocculating agent metering pump is connected with a fourth pipeline, and the fourth pipeline is communicated with the second pipeline; the ozone generator is connected with a fifth pipeline, and the fifth pipeline is connected to the tail tank; the settling cask is provided with a plurality ofly, and loops through the sixth pipeline and establish ties, and the settling cask end of intaking of head end is connected with the second pipeline, and terminal settling cask goes out the water end and is connected with the seventh pipeline, and in the seventh tube coupling to the tailtank, placed the titanium dioxide solid in the tailtank, the tailtank is connected with the eighth pipeline, and the eighth tube coupling is to aquaculture water department.

The sewage recycling treatment system for fish pond culture disclosed by the patent utilizes a sewage pump to pump sewage in a fish pond, can only pump clear water in the fish pond, and cannot pump sludge at the bottom of the fish pond.

In the actual culture of the fishpond, the bottom of the fishpond gradually settles and accumulates silt. After sludge at the bottom of the fishpond is accumulated, bait and fish feces are fermented on the sludge to form a pollution source. At present, a bottom changing method is often adopted to treat a pollution source, specifically, a fish pond culture owner utilizes a medicament to change the bottom for disinfection, the cost of bottom changing disinfection is high, meanwhile, a sludge source at the bottom of the fish pond is not pumped away, bottom changing disinfection is carried out on the same day, subsequent pollutants can continuously emerge to pollute the water quality of the fish pond, and further, the fish pond culture is adversely affected.

SUMMERY OF THE UTILITY MODEL

In order to overcome the defect that exists among the above-mentioned prior art, the utility model aims at providing a pond desilting changes end clarification plant, the utility model aims at solving among the prior art and can't carry out the problem of clearing up to the silt at the bottom of the pond of pond. The utility model discloses a be provided with to the pond bottom let in gas with the silt and the water of pond bottom stir the aeration equipment muddy, sewage extraction device will stir the sewage that contains silt again and extract, and purifier carries out purification treatment to the sewage that sewage extraction device extracted again to carry out the desilting to the silt of pond bottom and change the end and purify, improved the quality of water of pond, and then improved the effect of breeding fish of pond.

In order to realize the above purpose, the utility model discloses a technical scheme:

a fishpond dredging and bottom-changing purifying device comprises:

the aeration device is used for introducing gas to the bottom of the fish pond to stir the sludge and water at the bottom of the fish pond, and the aeration output end of the aeration device is positioned in the fish pond;

the sewage pumping device is used for pumping muddy sewage, and the water inlet end of the sewage pumping device is placed in the fishpond and positioned beside the aeration output end of the aeration device;

the purification device is used for purifying the sewage extracted by the sewage extraction device, the sewage inlet end of the purification device is connected with the output end of the sewage extraction device, and the purified water outlet end of the purification device is connected into the fishpond;

the pollutant collecting device is used for collecting the settled pollutants purified by the purifying device, and the inlet end of the pollutant collecting device is connected with the sewage discharge end of the purifying device.

Further, the aeration device comprises an aerator, an aeration connecting pipe and an aeration disc; the aerator is arranged on the bank of the fishpond and is connected with the aeration disc through an aeration connecting pipe, and the aeration disc is positioned in the fishpond.

Further, the distance between the aeration disc and the bottom of the fishpond is 10-30cm.

Further, the sewage pumping device comprises a sewage pump, a sewage pump water inlet pipe and a sewage pump water outlet pipe; the sewage pump is arranged on the bank of the fish pond, the water pumping port of the sewage pump is connected with the water inlet pipe of the sewage pump, the water inlet end of the water inlet pipe of the sewage pump is arranged in the fish pond and is positioned above the aeration disc, and the water outlet of the sewage pump is connected into the purifying device through the water outlet pipe of the sewage pump.

Further, the purification device comprises a settling tank and a tail tank;

the settling tanks are arranged in multiple stages and are sequentially connected through pipelines, and the water inlet end of the first-stage settling tank is connected with the drain pipe of the sewage pump; the water inlet end of the tail tank is connected with the water outlet end of the tail-stage settling tank through a pipeline, and the water outlet end of the tail tank is connected into the fishpond through a pipeline; and the sewage discharge ends of the settling tank and the tail tank are connected with the pollutant collecting device through pipelines.

Further, a first water retaining cylinder is arranged in the primary sedimentation tank in a hanging mode, the height of the first water retaining cylinder is higher than that of a water outlet at the top end of the sedimentation tank, and the bottom of the first water retaining cylinder penetrates through the water outlet; a suspended second water retaining cylinder is arranged in the first water retaining cylinder, the bottom of the second water retaining cylinder is closed, and the top of the second water retaining cylinder is open; the water outlet end of the sewage pump water outlet pipe is positioned in the second water retaining cylinder, and the sewage pump water outlet pipe is connected with a medicine feeding mechanism.

Further, a liquid medicine mixing cavity for mixing liquid medicine conveyed by the medicine feeding mechanism and sewage conveyed by the sewage pumping device is arranged on the sewage pump drain pipe, and the inner diameter of the liquid medicine mixing cavity is larger than that of the sewage pump drain pipe.

Further, the medicine feeding mechanism comprises a first medicine feeding assembly for adding a PAC (polyaluminium chloride) medicament into the liquid medicine mixing cavity for mixing and a second medicine feeding assembly for adding a PAM (polyacrylamide) medicament into the second water retaining cylinder for mixing;

the first medicine feeding assembly comprises a first medicine tank, a first metering pump and a first medicine feeding pipe; an inlet pipe of the first metering pump is inserted into the first medicine tank, an outlet of the first metering pump is connected with the first medicine adding pipe, and the first medicine adding pipe is connected to a sewage pump drain pipe in front of the medicine liquid mixing cavity;

the second medicine feeding assembly comprises a second medicine tank, a second metering pump and a second medicine feeding pipe, an inlet pipe of the second metering pump is inserted into the second medicine tank, an outlet of the second metering pump is connected with the second medicine feeding pipe, and the second medicine feeding pipe is connected to a sewage pump drain pipe in front of the second water retaining cylinder and located behind the liquid medicine mixing cavity.

Further, the tail tank is connected with an ozone generator, and the output end of the ozone generator is connected into the tail tank through a pipeline.

Further, the pollutant collecting device comprises a pollutant collecting pool and a sewage discharge pipe, one end of the sewage discharge pipe is connected with the sewage discharge end of the purifying device, and the other end of the sewage discharge pipe is connected to the inside of the pollutant collecting pool.

The utility model has the advantages that:

the utility model provides a pond desilting changes end clarification plant, aeration equipment lets in gas and stirs muddy with the silt and the water of pond bottom to the pond bottom, and sewage extraction device will stir the sewage that contains silt again and extract, and purifier carries out purification treatment to the sewage that sewage extraction device extracted again, and it has extracted the clearance to the silt of pond bottom, has purified the bottom of pond, has improved the bottom environment of pond, and then has improved the quality of water of pond, has improved the effect of breeding fish of pond.

Drawings

FIG. 1 is a schematic view of the present invention;

FIG. 2 is a schematic view of the first-stage settling tank of the present invention;

reference numerals are as follows:

1. an aeration device; 11. an aerator; 12. an aeration connecting pipe; 13. an aeration disc; 2. a drawing mechanism; 21. a sewage pump; 22. a sewage pump water inlet pipe; 23. a sewage pump drain pipe; 231. a liquid medicine mixing cavity; 3. a purification device; 31. a settling tank; 311. a first water retaining cylinder; 312. a second water retaining cylinder; 313. a first canister; 314. a first metering pump; 315. a first dosing tube; 316. a second canister; 317. a second metering pump; 318. a second dosing tube; 32. a tail tank; 321. an ozone generator; 4. a contaminant collection device; 41. a pollutant collecting tank; 42. a sewage discharge pipe.

Detailed Description

The conception, the specific structure, and the technical effects produced by the present invention will be clearly and completely described below with reference to the embodiments and the accompanying drawings, so as to fully understand the objects, the features, and the effects of the present invention.

Example 1

A fish pond dredging and bottom-changing purifying device, as shown in figure 1, comprising:

the aeration device 1 is used for introducing gas to the bottom of the fishpond to stir silt and water at the bottom of the fishpond, and the aeration output end of the aeration device 1 is positioned in the fishpond;

a sewage extraction device 2 for extracting muddy sewage, wherein the water inlet end of the sewage extraction device 2 is arranged in the fishpond and is positioned beside the aeration output end of the aeration device 1;

the purification device 3 is used for purifying the sewage extracted by the sewage extraction device 2, the sewage inlet end of the purification device 3 is connected with the output end of the sewage extraction device 2, and the purified water outlet end of the purification device is connected into the fishpond;

the pollutant collecting device 4 that subsides the pollutant and collect to purifier 3 after purifying, the entrance point and the blowdown end of purifier 3 of pollutant collecting device 4 are connected.

In the embodiment, the aeration device 1 is used for introducing gas to the bottom of the fish pond to stir silt and water at the bottom of the fish pond; the sewage extraction device 2 is used for extracting muddy sewage containing sludge; the purification device 3 is used for purifying the sewage extracted by the sewage extraction device 2 and discharging the purified water into the fishpond so as to recycle the water in the fishpond; the pollutant collecting device 4 is used for collecting the settled pollutants purified by the purifying device 3. The bottom clarification plant is changed in pond desilting of this embodiment, has carried out the extraction clearance to the silt of pond bottom, has purified the bottom of pond, has improved the bottom environment of pond, and then has improved the quality of water of pond, has improved the fish culture effect of pond.

Example 2

The present embodiment is further improved on the basis of embodiment 1, and as shown in fig. 1, the aeration apparatus 1 includes an aerator 11, an aeration connecting pipe 12 and an aeration disc 13; the aerator 11 is arranged on the bank of the fish pond and is connected with the aeration disc 13 through the aeration connecting pipe 12, and the aeration disc 13 is positioned in the fish pond. The aeration disc 13 is 10-30cm away from the bottom of the fishpond, and the distance is 20 cm in the embodiment.

In this embodiment, the aerator 11 generates gas, and the gas is conveyed to the aeration disc 13 through the aeration connecting pipe 12 and then discharged from the aeration disc 13, so that the sludge and water at the bottom of the fish pond are stirred and pumped by the sewage pumping device 2, and the sludge at the bottom of the fish pond is pumped out, thereby achieving the effects of dredging, changing bottom and purifying. Meanwhile, oxygen in the air is introduced into the fishpond through the aeration device 1, so that the oxidative decomposition of the microorganisms on organic matters in the sewage is ensured under the condition that sufficient dissolved oxygen exists.

Example 3

This embodiment is further improved on the basis of embodiment 2, as shown in fig. 1, the sewage pumping device 2 includes a sewage pump 21, a sewage pump inlet pipe 22 and a sewage pump outlet pipe 23; the sewage pump 21 is installed on the bank of the fishpond, the water pumping port of the sewage pump is connected with the sewage pump inlet pipe 22, the water inlet end of the sewage pump inlet pipe 22 is placed in the fishpond and is positioned above the aeration disc 13, and the water outlet of the sewage pump 21 is connected into the purification device 3 through the sewage pump drain pipe 23.

In this embodiment, the sewage pump 21 operates to pump the sewage containing sludge, which is stirred by the aeration disk 13 thereunder, and the sewage containing sludge is sent to the purification apparatus 3 through the sewage pump inlet pipe 22, the sewage pump 21 and the sewage pump drain pipe 23 in sequence to be purified.

Example 4

This example is a further improvement over example 3, in which the purification apparatus 3 comprises a settling tank 31 and a tail tank 32, as shown in fig. 1.

The settling tank 31 is provided with multiple stages and is connected sequentially through pipelines, and the water inlet end of the first-stage settling tank 31 is connected with the sewage pump drain pipe 23; the water inlet end of the tail tank 32 is connected with the water outlet end of the tail stage settling tank 31 through a pipeline, and the water outlet end of the tail tank 32 is connected into the fishpond through a pipeline; the sewage discharge ends of the settling tank 31 and the tail tank 32 are connected with the pollutant collecting device 4 through pipelines.

In this embodiment, the settling tank 31 is provided with three stages, which are all used for settling and removing sludge and suspended matters in the sewage. The tail tank 32 is connected with an ozone generator 321, and the output end of the ozone generator 321 is connected to the inside of the tail tank 32 through a pipeline. Ozone is added into the tail tank 32, the ozone is used as an oxidant to oxidize various organic matters and inorganic matters in the sewage, and nano titanium dioxide solid is simultaneously added into the tail tank 32 and used for purifying, disinfecting and sterilizing the sewage through photocatalysis.

Example 5

In this embodiment, a further improvement is made on the basis of embodiment 4, as shown in fig. 1 and 2, a first water retaining cylinder 311 is suspended inside the primary settling tank 31, and the height of the first water retaining cylinder 311 is higher than that of the water outlet at the top end of the settling tank and the bottom of the first water retaining cylinder runs through; a suspended second water retaining cylinder 312 is arranged in the first water retaining cylinder 311, the bottom of the second water retaining cylinder 312 is closed, and the top of the second water retaining cylinder is open; the water outlet end of the sewage pump water outlet pipe 23 is positioned in the second water retaining cylinder 312, and the sewage pump water outlet pipe 23 is connected with a medicine feeding mechanism.

In this embodiment, the height of the first water-retaining cylinder 311 is higher than the height of the top water outlet of the settling tank, and the bottom of the first water-retaining cylinder penetrates through the bottom of the settling tank, so that the sewage from the sewage pump drain pipe 23 can only impact on flocs inside the first water-retaining cylinder 311, and cannot impact on flocs outside the first water-retaining cylinder 311, so compared with the prior art, the flocs in the entire settling tank can be impacted, and in this embodiment, only the inside of the first water-retaining cylinder 311 is impacted, and the settling effect is better; meanwhile, since the height of the first water blocking cylinder 311 is higher than that of the water outlet, flocs in the first water blocking cylinder 311 do not flow toward the water outlet.

The height that highly is higher than the delivery port of a first water retaining section of thick bamboo 311 and its bottom run through, and sewage can be in a first water retaining section of thick bamboo 311 downward flow when flowing, passes a first water retaining section of thick bamboo 311 from a first water retaining section of thick bamboo 311 bottom, and upward flow again is discharged from the delivery port, and the distance that sewage flowed in the settling cask 31 increases to increased the time that sewage flowed in the settling cask 31, made sewage and medicament fully react the flocculation, in order to get rid of the sewage pollutant deposit.

In this embodiment, since the second water retaining cylinder 312 is provided, the sewage firstly enters the second water retaining cylinder 312, flows upwards under the blocking of the bottom plate of the second water retaining cylinder 312, turns over the top of the second water retaining cylinder 312, and then enters the first water retaining cylinder 311, so that the sewage is prevented from directly impacting the first water retaining cylinder 311, flocculates in the first water retaining cylinder 311 are dispersed, and the area of the sewage impacting the flocculates is smaller.

In this embodiment, the first water retaining cylinder 311 and the second water retaining cylinder 312 are provided only in the first-stage settling tank 31, and are connected to a chemical feeding mechanism. In one embodiment, the first and second water-retaining cylinders 311 and 312 may be provided in the second and third settling tanks 31, and a chemical feed mechanism may be connected to the tanks to enhance the settling effect.

Example 6

In this embodiment, a further improvement is made on the basis of embodiment 5, as shown in fig. 1 and 2, the sewage pump discharge pipe 23 is provided with a chemical liquid mixing cavity 231 for mixing the chemical liquid delivered by the chemical liquid feeding mechanism with the sewage delivered by the sewage pumping device 2, and the inner diameter of the chemical liquid mixing cavity 231 is larger than the inner diameter of the sewage pump discharge pipe 23.

In this embodiment, the liquid medicine mixing chamber 231 is used for fully mixing the liquid medicine and the sewage. Specifically, the liquid medicine is fully mixed with the sewage in the liquid medicine mixing cavity 231, the fully mixed liquid medicine enters the settling tank 31, and pollutants in the sewage settle in the settling tank to fully remove the pollutants in the sewage. The inner diameter of the liquid medicine mixing chamber 231 is larger than the inner diameter of the drain pipe 23 of the sewage pump, so that the sewage and the liquid medicine are fully mixed.

Example 7

This embodiment is further improved on the basis of embodiment 6, and as shown in fig. 1 and 2, the medicine feeding mechanism includes a first medicine feeding assembly for feeding PAC medicine into the medicine liquid mixing chamber 231 for mixing, and a second medicine feeding assembly for feeding PAM medicine into the second water blocking cylinder 312 for mixing.

The first medicine feeding assembly comprises a first medicine tank 313, a first metering pump 314 and a first medicine feeding pipe 315; an inlet pipe of the first metering pump 314 is inserted into the first canister 313, an outlet thereof is connected to a first dosing pipe 315, and the first dosing pipe 315 is connected to the sewage pump discharge pipe 23 in front of the chemical mixing chamber 231.

The second medicine feeding assembly comprises a second medicine tank 316, a second metering pump 317 and a second medicine feeding pipe 318, an inlet pipe of the second metering pump 317 is inserted into the second medicine tank 316, an outlet of the second metering pump 317 is connected with the second medicine feeding pipe 318, and the second medicine feeding pipe 318 is connected to the sewage pump drainage pipe 23 in front of the second water retaining cylinder 312 and is located behind the liquid medicine mixing cavity 231.

In this embodiment, by providing two kinds of chemicals (PAC chemical and PAM chemical), the two kinds of chemicals are sufficiently mixed with the sewage in the chemical mixing chamber 231 and the second water blocking cylinder 312, so that the pollutants in the sewage are settled and removed.

Example 8

This embodiment is further improved on the basis of embodiment 7, and as shown in fig. 1, the pollutant collecting device 4 comprises a pollutant collecting tank 41 and a sewage discharge pipe 42, one end of the sewage discharge pipe 42 is connected with the sewage discharge end of the purifying device 3, and the other end is connected into the pollutant collecting tank 41. In this embodiment, the sediments in the settling tank 31 and the tail tank 32 are discharged to the pollutant collecting tank 41 through the sewage pipe 42 and collected.

For better understanding, the utility model discloses, following is to the theory of operation of the utility model make a complete description:

before use, PAC and PAM flocculants are added into the first tank 313 and the second tank 316 respectively and mixed with water to obtain a flocculant liquid medicament mixture.

When in use, the aerator 11 generates gas, the gas is conveyed to the aeration disc 13 through the aeration connecting pipe 12 and then is discharged from the aeration disc 13, and sludge at the bottom of the fishpond is stirred with water.

The sewage pump 21 operates to pump the sewage containing the sludge, which is stirred by the aeration disc 13 below the sewage pump, and the sewage containing the sludge is sent into the primary sedimentation tank 31 of the purification device 3 to be purified through the sewage pump inlet pipe 22, the sewage pump 21 and the sewage pump drain pipe 23 in sequence.

Specifically, when the sewage pump drain pipe 23 conveys sewage, the first metering pump 314 and the second metering pump 317 operate, the first metering pump 314 sends the PAC reagent mixture in the first medicine tank 313 into the first medicine adding pipe 315, the PAC reagent mixture is sent into the sewage pump drain pipe 23 through the first medicine adding pipe 315, the PAC reagent mixture flows into the medicine liquid mixing cavity 231 along with the sewage, the PAC reagent mixture and the sewage are fully mixed in the medicine liquid mixing cavity 231, and the mixed PAC reagent mixture is sent into the settling tank 31 through the sewage pump drain pipe 23.

The second metering pump 317 feeds the PAM chemical mixture in the second chemical tank 316 into the second chemical feeding pipe 318, and feeds the PAM chemical mixture into the sewage pump drain pipe 23 through the second chemical feeding pipe 318, and flows into the second water retaining cylinder 312 along with the sewage, and the PAM chemical mixture is sufficiently mixed with the sewage in the second water retaining cylinder 312.

As shown in fig. 2, in the second water retaining cylinder 312, the mixed liquid contains PAC reagent, PAM reagent, sewage pollutants (containing sludge), etc., and the mixed liquid first flows upward in the second water retaining cylinder 312, then flows downward after turning over the second water retaining cylinder 312, passes through the first water retaining cylinder 311 from the bottom of the first water retaining cylinder 311, then flows upward, and is discharged from the water outlet to enter the next-stage settling tank 31 for settling in sequence.

The sewage finally enters a tail tank 32, ozone is added into the tail tank 32, the ozone is used as an oxidant to oxidize various organic matters and inorganic matters in the sewage, and the sewage after being treated by the tail tank 3 is discharged into a fishpond.

When sewage flows in the settling tank 31 and the tail tank 32, sediment (including sludge) settles at the bottom thereof. When the sediments (including the sludge) in the settling tank 31 and the tail tank 32 need to be discharged, the sediments (including the sludge) in the settling tank 31 and the tail tank 32 are discharged into the pollutant collecting tank 41 through the sewage discharge pipe 42 and collected.

The embodiments of the present invention have been described in detail, but the present invention is not limited to the embodiments, and those skilled in the art can make various equivalent modifications or substitutions without departing from the spirit of the present invention, and the equivalents or substitutions are included in the scope of the present invention defined by the claims.

Claims (10)

1. The utility model provides a pond desilting makes end clarification plant, its characterized in that includes:

the aeration device (1) is used for introducing gas to the bottom of the fish pond to stir sludge and water at the bottom of the fish pond, and the aeration output end of the aeration device (1) is positioned in the fish pond;

the sewage pumping device (2) is used for pumping muddy sewage, and the water inlet end of the sewage pumping device (2) is placed in the fishpond and is positioned beside the aeration output end of the aeration device (1);

the purification device (3) is used for purifying the sewage extracted by the sewage extraction device (2), the sewage inlet end of the purification device (3) is connected with the output end of the sewage extraction device (2), and the purified water outlet end of the purification device (3) is connected into the fishpond;

the pollutant collecting device (4) for collecting the settled pollutants purified by the purifying device (3), wherein the inlet end of the pollutant collecting device (4) is connected with the sewage discharge end of the purifying device (3).

2. The fish pond dredging, bottom-improving and purifying equipment according to claim 1, characterized in that the aeration device (1) comprises an aerator (11), an aeration connecting pipe (12) and an aeration disc (13); the aerator (11) is arranged on the bank of the fishpond and is connected with the aeration disc (13) through an aeration connecting pipe (12), and the aeration disc (13) is positioned in the fishpond.

3. The fish pond dredging, bottom-improving and purifying apparatus as claimed in claim 2, characterized in that the aeration disc (13) is 10-30cm from the bottom of the fish pond.

4. A fish pond dredging, bottom-improving and purifying apparatus according to claim 2, characterized in that the sewage extraction device (2) comprises a sewage pump (21), a sewage pump inlet pipe (22) and a sewage pump outlet pipe (23); the sewage pump (21) is arranged on the bank of the fish pond, the water pumping port of the sewage pump is connected with the sewage pump water inlet pipe (22), the water inlet end of the sewage pump water inlet pipe (22) is placed in the fish pond and is positioned above the aeration disc (13), and the water outlet of the sewage pump (21) is connected into the purification device (3) through the sewage pump water outlet pipe (23).

5. A fishpond dredging and bottoming purification device according to claim 4, characterized in that the purification device (3) comprises a settling tank (31) and a tailing tank (32);

the settling tank (31) is provided with multiple stages and is sequentially connected through pipelines, and the water inlet end of the first-stage settling tank (31) is connected with the sewage pump drain pipe (23); the water inlet end of the tail tank (32) is connected with the water outlet end of the tail-stage settling tank (31) through a pipeline, and the water outlet end of the tail tank (32) is connected into the fishpond through a pipeline; and the sewage discharge ends of the settling tank (31) and the tail tank (32) are connected with the pollutant collecting device (4) through pipelines.

6. The fish pond dredging, bottom-improving and purifying equipment according to claim 5, characterized in that a first water retaining cylinder (311) is suspended in the primary settling tank (31), the height of the first water retaining cylinder (311) is higher than that of a water outlet at the top end of the settling tank, and the bottom of the first water retaining cylinder penetrates through the water outlet; a suspended second water retaining cylinder (312) is arranged in the first water retaining cylinder (311), the bottom of the second water retaining cylinder (312) is closed, and the top of the second water retaining cylinder is open; the water outlet end of the sewage pump water outlet pipe (23) is positioned in the second water retaining cylinder (312), and the sewage pump water outlet pipe (23) is connected with a medicine feeding mechanism.

7. The fish pond dredging, bottom-improving and purifying equipment according to claim 6, wherein the sewage pump drainage pipe (23) is provided with a liquid medicine mixing cavity (231) for mixing the liquid medicine delivered by the medicine feeding mechanism with the sewage delivered by the sewage pumping device (2), and the inner diameter of the liquid medicine mixing cavity (231) is larger than that of the sewage pump drainage pipe (23).

8. The fishpond dredging, bottom-improving and purifying device as claimed in claim 7, wherein the medicine feeding mechanism comprises a first medicine feeding assembly for adding PAC (polyaluminium chloride) medicines into the medicine liquid mixing cavity (231) for mixing and a second medicine feeding assembly for adding PAM (polyacrylamide) medicines into the second water baffle cylinder (312) for mixing;

the first medicine feeding assembly comprises a first medicine tank (313), a first metering pump (314) and a first medicine adding pipe (315); an inlet pipe of the first metering pump (314) is inserted into the first medicine tank (313), an outlet of the first metering pump is connected with the first medicine adding pipe (315), and the first medicine adding pipe (315) is connected to a sewage pump drainage pipe (23) in front of the medicine liquid mixing cavity (231);

the second medicine feeding assembly comprises a second medicine tank (316), a second metering pump (317) and a second medicine feeding pipe (318), an inlet pipe of the second metering pump (317) is inserted into the second medicine tank (316), an outlet of the second metering pump is connected with the second medicine feeding pipe (318), and the second medicine feeding pipe (318) is connected to a sewage pump drainage pipe (23) in front of a second water retaining cylinder (312) and located behind a liquid medicine mixing cavity (231).

9. The fish pond desilting bottom-improving purification equipment as recited in claim 5, characterized in that the tail tank (32) is connected with an ozone generator (321), and the output end of the ozone generator (321) is connected into the tail tank (32) through a pipeline.

10. A fish pond dredging, bottom-improving purification device according to claim 1, characterized in that the pollutant collecting means (4) comprises a pollutant collecting tank (41) and a sewage discharge pipe (42), one end of the sewage discharge pipe (42) is connected with the sewage discharge end of the purification device (3), and the other end is connected into the pollutant collecting tank (41).

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