CN220174200U - Sewage draining device and system for dredging and bottom-cleaning of fishpond - Google Patents

Abstract

The utility model discloses a sewage disposal device and a system for dredging and bottom-changing purification of a fish pond, and relates to the technical field of sewage treatment of the fish pond. When the sedimentation pollutant is discharged, the pollutant filtering piece on the sewage pipeline filters the pollutant at first, so that the subsequent treatment time and the subsequent treatment workload of the pollutant are reduced. The pollutant filtering piece can be arranged in a detachable way, and when the pollution discharge is influenced by the blockage of the pollutant filtering piece, the pollutant filtering piece can be detached and replaced by a new pollutant filtering piece; the pollutant filter is provided with the filter screen of different filtration pore diameters in order to filter the pollutant of different pore diameters, and when the filtration pore of aperture is blockked up, the pollutant still can pass through in the filtration pore of macropore, makes it not influence blowdown work.

Description

Sewage draining device and system for dredging and bottom-cleaning of fishpond

Technical Field

The utility model relates to the technical field of fish pond sewage treatment, in particular to a sewage discharge device and a system for dredging and bottom-improving purification of a fish pond.

Background

With the rapid development of the aquaculture industry in China, the environment condition of carrier-water resources on which aquaculture depends has become a highly concerned problem in China and industry.

The fish in the fishpond is a specific form of the aquaculture, after the fish is cultured in the fishpond, the quality of water in the fishpond (such as permanganate index, ammonia nitrogen, total phosphorus and the like) is concerned, when water pollution damages the growth of the fish, sewage treatment is needed to be carried out on the water in the fishpond in time, otherwise, the water is polluted for a long time to damage the health of the fish, and meanwhile, pollutants in the fishpond enter a downstream river along with rainfall in a rainfall period, and water pollution is also caused to the downstream river. Therefore, in the fish pond culture technology in China, the standardization of water quality is very important, and a special sewage treatment device is needed to treat the fish pond sewage, so that on one hand, the growth of fish shoals is facilitated, and on the other hand, the pollution to downstream river channels is avoided.

Among the prior art, application number is 2022223693029, discloses a pond desilting changes end clarification plant, includes: the aeration device is used for introducing gas to the bottom of the fishpond to stir the sludge and water at the bottom of the fishpond, and the aeration output end of the aeration device is positioned in the fishpond; a sewage extraction device for extracting sewage which is stirred and contains silt, wherein the water inlet end of the sewage extraction device is arranged in the fishpond and is positioned beside the aeration output end of the aeration device; and a purifying device for purifying the sewage extracted by the sewage extracting device. According to the utility model, 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, the sewage extraction device is used for extracting the sewage which is stirred and contains the sludge, and the purification device is used for purifying the sewage extracted by the sewage extraction device, so that the sludge at the bottom of the fish pond is extracted and cleaned, the bottom of the fish pond is purified, the bottom environment of the fish pond is improved, the water quality of the fish pond is further improved, and the fish culturing effect of the fish pond is improved.

The fish pond dredging and bottom-changing purifying equipment disclosed in the patent above is characterized in that settled pollutants in a settling tank and a tail tank are discharged into a pollutant collecting tank through a sewage discharge pipe to be collected, the settled pollutants are treated by the pollutant collecting tank, and the treated clean water is discharged into the fish pond to be reused. The settled pollutants are directly discharged into the pollutant collecting tank through the blow-down pipe, the blow-down pipe does not treat the settled pollutants, and the time and the workload for treating the settled pollutants in the follow-up process are increased.

Disclosure of Invention

In order to overcome the defects in the prior art, the utility model aims to provide a dredging bottom-to-purifying sewage disposal device and system for a fish pond, so as to solve the problems that the settled pollutants are directly discharged into a pollutant collecting tank through a sewage disposal pipe, the sewage disposal pipe does not treat the settled pollutants, and the time and the workload for treating the settled pollutants are increased. According to the utility model, the pollutant filtering pieces are arranged on the sewage pipeline along the pollutant flowing direction, so that when pollutant is discharged, the pollutant filtering pieces on the sewage pipeline firstly filter the pollutant, and the subsequent treatment time and treatment workload of the pollutant are reduced.

In order to achieve the above purpose, the present utility model adopts the technical scheme that:

the utility model provides a drain of dredging of pond changes end purification, includes the drain pipe who is used for discharging the subsided pollutant after the pond sewage purification, install a plurality of detachable pollutant filter pieces along pollutant flow direction on the drain pipe, be provided with the filter screen of different filtration apertures in the pollutant filter piece.

Preferably, the pollutant filter element comprises a filter screen mounting pipeline and a filter screen plate, wherein the filter screen mounting pipeline penetrates through the filter screen mounting pipeline front and back, and the filter screen plate is positioned in the filter screen mounting pipeline and provided with a plurality of filter holes with different apertures.

Preferably, the filter screen plate comprises an inner filter screen on the inner side and an outer filter screen on the outer side, wherein the inner filter screen is positioned in the outer filter screen, and the pore diameters of the inner filter screen and the outer filter screen are different.

Preferably, the aperture of the filter hole of the inner filter screen is smaller than that of the filter hole of the outer filter screen.

Preferably, the port inner side wall of the filter screen mounting pipeline is sleeved on the port outer side wall of the sewage pipeline, and the filter screen mounting pipeline is detachably and hermetically connected by using a hoop.

Preferably, the inlet end of the sewage drain pipe is provided with a sewage drain inlet pipe network, a plurality of downward sewage drain channels are arranged on the sewage drain inlet pipe network, the downward sewage drain channels are converged to a sewage drain outlet, and the sewage drain outlet is connected with the inlet end of the sewage drain pipe.

Preferably, the sewage inlet pipe network is arranged at the bottom end of the interior of the settling tank of the pond dredging bottom-changing purifying device.

Based on the sewage discharging device, the utility model also provides a dredging and bottom-changing purifying system for a fish pond, which comprises the following components:

the pretreatment device is arranged in the fish pond and is used for pretreating sewage in the fish pond;

the sewage extraction device is used for extracting sewage pretreated by the pretreatment device, and the water inlet end of the sewage extraction device is placed in the fishpond and is positioned in or beside the pretreatment device;

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

and the inlet end of the sewage discharging device is connected with the sewage discharging end of the purifying device.

The utility model has the beneficial effects that:

1. according to the sewage disposal device provided by the utility model, the plurality of pollutant filtering pieces are arranged on the sewage disposal pipeline along the pollutant flowing direction, and when the sedimentary pollutants are discharged, the pollutant filtering pieces on the sewage disposal pipeline firstly filter the pollutants, so that the subsequent treatment time and the subsequent treatment workload of the pollutants are reduced.

2. According to the sewage disposal device provided by the utility model, the pollutant filtering piece is detachably arranged, and when the pollution is caused by blockage of the pollutant filtering piece, the pollutant filtering piece can be detached and replaced by a new pollutant filtering piece; the pollutant filter is provided with the filter screen of different filtration pore diameters in order to filter the pollutant of different pore diameters, when the filtration pore of aperture is blockked up, the pollutant still can pass through in the filtration pore of aperture greatly, makes it not influence blowdown work, has reduced the change frequency of pollutant filter.

3. According to the dredging and bottom-changing purification system for the fish pond, dredging and bottom-changing are carried out on the fish pond, so that the cultivation density of the fish pond is increased, and income is increased for farmers; meanwhile, the device is arranged on the bank side of the fish pond, the installation conditions are not limited, and the cost of dredging and bottom changing of the fish pond is reduced.

Drawings

FIG. 1 is a schematic illustration of the location of a drain and a contaminant filter of the present utility model;

FIG. 2 is a schematic view of a contaminant filter of the present utility model;

FIG. 3 is a schematic illustration of the location of the drain, contaminant filter and drain inlet piping network of the present utility model;

FIG. 4 is a schematic diagram of a bottom-to-bottom cleaning system for a fish pond according to the present utility model;

FIG. 5 is a schematic diagram of the utility model at a first stage settling tank;

reference numerals:

1. a pretreatment device; 11. an aerator; 12. an aeration connecting pipe; 13. an aeration disc; 2. a sewage extraction device; 21. a sewage pump; 22. a sewage pump inlet pipe; 23. a sewage pump drain pipe; 231. a liquid medicine mixing cavity; 3. a purifying device; 31. a settling tank; 311. a first water blocking cylinder; 312. a second water blocking 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 sewage disposal device; 41. a sewage drain pipe; 42. a contaminant filter; 421. the filter screen is provided with a pipeline; 422. a filter screen plate; 423. an inner filter screen; 424. an outer layer filter screen; 43. a sewage inlet pipe network; 431. a trapway; 432. and a sewage outlet.

Detailed Description

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

Example 1

A sewage disposal device for dredging and bottom-cleaning of a fish pond is shown in fig. 1, and comprises a sewage disposal pipeline 41 for discharging settled pollutants after the sewage of the fish pond is purified, wherein a plurality of detachable pollutant filtering pieces 42 are arranged on the sewage disposal pipeline 41 along the flowing direction of the pollutants, and filter screens with different filtering apertures are arranged in the pollutant filtering pieces 42.

In this embodiment, the sewage drain 41 is used for discharging the settled pollutants purified by the bottom-to-pond dredging and purifying device, and the pollutant filter 42 is used for filtering the settled pollutants in the sewage drain 41. When discharging the pollutant, the pollutant filter element 41 on the sewage drain 41 filters the pollutant first, so that the subsequent treatment time and treatment workload of the pollutant are reduced. The pollutant filter 42 can be detachably arranged, and when the pollutant filter 42 is blocked to influence pollution discharge, the pollutant filter 42 can be detached and replaced by a new pollutant filter 42. The pollutant filter 42 is internally provided with filter screens with different filter apertures to filter pollutants with different apertures, and when the filter holes with small apertures are blocked, the pollutants can pass through the filter holes with large apertures, so that the pollutant filter does not influence the pollution discharge work.

In this embodiment, the contaminant filter 42 is provided with a plurality of filter screens of the contaminant filter 42, and the filter apertures of the filter screens of the plurality of contaminant filters 42 may be set to be the same or different. When the same, the contaminant filter 42 at the rear again filters contaminants of the same pore size. When different, the pore diameters of the filtering pores of the pollutant filtering parts 42 at the rear are sequentially reduced to perform classified filtering on pollutants, and pollutants with larger pore diameters are filtered out first and then pollutants with smaller pore diameters are filtered out.

Example 2

This embodiment is further described on the basis of embodiment 1, as shown in fig. 1 and 2, the pollutant filtering member 42 includes a filter screen mounting pipe 421 and a filter screen plate 422, the filter screen mounting pipe 421 penetrates back and forth, the filter screen plate 422 is located in the filter screen mounting pipe 421 and is provided with a plurality of filtering holes with different diameters, and the filter screen plate 422 is mounted through the filter screen mounting pipe 421 to filter the pollutant.

As shown in fig. 1 and 2, the filter screen plate 422 includes an inner filter screen 423 on the inner side and an outer filter screen 424 on the outer side, and the inner filter screen 423 is located inside the outer filter screen 424 and has different filter pore diameters. Specifically, the pore diameter of the filter pores of the inner filter 423 is smaller than that of the filter pores of the outer filter 424.

In this embodiment, through setting up inlayer filter screen 423 and outer filter screen 424, the aperture of the filtration pore of inlayer filter screen 423 is less, and when the filtration pore of inlayer filter screen 423 was blockked up to the pollutant of macroparticle, other pollutants still can filter through outer filter screen 424, also can also filter the work through outer filter screen 424, thereby avoided single inlayer filter screen 423 to block up and lead to the filter screen 422 to block up and influence blowdown work, reduced the change frequency of pollutant filter.

In this embodiment, the inner side wall of the port of the filter screen mounting pipe 421 is sleeved on the outer side wall of the port of the sewage drain pipe 41, and is detachably and hermetically connected by using a hoop. Through big and small mouthful hitches to utilize staple bolt fixed hitching interface, with realizing dismantling the connection to pollutant filter 42, when its use is blockked up for a period of time, dismantle the staple bolt earlier, dismantle pollutant filter 42 again and renew can.

Example 3

The embodiment is further described based on embodiment 1 or 2, as shown in fig. 3, the inlet end of the sewage drain pipe 41 is provided with a sewage drain inlet pipe network 43, the sewage drain inlet pipe network 43 is provided with a plurality of downward sewage drain channels 431, the downward sewage drain channels 431 are converged to a sewage drain outlet 432, and the sewage drain outlet 432 is connected with the inlet end of the sewage drain pipe 41. The sewage inlet pipe network 43 is arranged at the bottom end of the interior of the sedimentation tank of the pond dredging bottom-changing purifying device. In this embodiment, by arranging the above-mentioned downward blow-down passages 431, so that the settled pollutants in the settling tank can be smoothly discharged, meanwhile, the blow-down passages 431 are arranged at the bottom end of the settling tank, and the pollutant discharge is more thorough in a manner of arranging the discharge ports relative to the side walls.

Example 4

A pond dredging bottom-modifying purification system, as shown in figures 4 and 5, comprising:

a pretreatment device 1 which is arranged in the fish pond and is used for pretreating the sewage in the fish pond;

a sewage extraction device 2 for extracting the sewage pretreated by the pretreatment device 1, wherein the water inlet end of the sewage extraction device 2 is arranged in the fishpond and is positioned in or beside the pretreatment 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;

and the sewage disposal device 4 is used for discharging the settled pollutants purified by the purifying device 3, and the inlet end of the sewage disposal device 4 is connected with the sewage disposal end of the purifying device 3.

In the embodiment, the pretreatment device 1 is an aeration device and is used for introducing gas into the bottom of the fishpond to stir the sludge and water at the bottom of the fishpond; the sewage extraction device 2 is used for extracting sewage which is stirred and contains silt; 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 sewage discharging device 4 is used for discharging the settled pollutants purified by the purifying device 3. The dredging and bottom-improving purifying system for the fishpond of the embodiment extracts and cleans sludge at the bottom of the fishpond, purifies the bottom of the fishpond, improves the bottom environment of the fishpond, improves the water quality of the fishpond, and improves the fish culturing effect of the fishpond.

As shown in fig. 4, the pretreatment 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 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 fish pond, and the embodiment is 20-cm.

In the embodiment, gas is generated through the aerator 11, is conveyed to the aeration disc 13 through the aeration connecting pipe 12 and is discharged from the aeration disc 13, so that the sludge at the bottom of the fishpond is stirred with water for the sewage extraction device 2 to extract, and the sludge at the bottom of the fishpond is extracted, so that the effect of dredging and bottom cleaning is achieved. Meanwhile, oxygen in the air is introduced into the fishpond through the aeration device 1, so that the oxidative decomposition of organic matters in the sewage is ensured under the condition that the microorganisms have sufficient dissolved oxygen.

As shown in fig. 4, the sewage pumping device 2 includes a sewage pump 21, a sewage pump water inlet pipe 22, and a sewage pump water outlet pipe 23; the sewage pump 21 is installed on the bank of the fishpond, the water suction port of the sewage pump 21 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 fishpond and is positioned above the aeration disc 13, and the water discharge port of the sewage pump 21 is connected into the purifying device 3 through the sewage pump water discharge pipe 23.

In this embodiment, the sewage pump 21 is operated, sewage containing sludge is pumped by stirring the sewage below the sewage pump through the aeration disc 13, and the sewage containing sludge is sent to the purification device 3 for purification treatment through the sewage pump water inlet pipe 22, the sewage pump 21 and the sewage pump water outlet pipe 23 in sequence.

As shown in fig. 4, the purification apparatus 3 includes a settling tank 31 and a tail tank 32. The settling tank 31 is provided with a plurality of stages and is connected in sequence through a pipeline, 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 draining ends of the settling tank 31 and the tail tank 32 are connected with the sewage draining device 4 through pipelines.

In this embodiment, the settling tank 31 is provided with three stages, each for settling out sludge and suspended matter 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 into the tail tank 32 through a pipeline. Ozone is added into the tail tank 32, so that various organic matters and inorganic matters in the sewage are oxidized by using the ozone as an oxidant, and nano titanium dioxide solids are simultaneously added into the tail tank 32, so that the sewage is purified, sterilized and disinfected by photocatalysis of the nano titanium dioxide solids.

As shown in fig. 4 and 5, a first water blocking cylinder 311 is suspended in the first-stage settling tank 31, the height of the first water blocking cylinder 311 is higher than the height of a water outlet at the top end of the settling tank, and the bottom of the first water blocking cylinder 311 penetrates through the settling tank; the first water blocking cylinder 311 is internally provided with a suspended second water blocking cylinder 312, the bottom of the second water blocking cylinder 312 is closed, and the top of the second water blocking cylinder is open; the water outlet end of the sewage pump drain pipe 23 is positioned in the second water blocking cylinder 312, and the sewage pump drain pipe 23 is connected with a medicine feeding mechanism.

In this embodiment, the height of the first water blocking cylinder 311 is higher than the height of the water outlet at the top end of the settling tank, and the bottom of the first water blocking cylinder 311 penetrates through, so that sewage fed by the sewage pump drain pipe 23 can only impact on flocculates inside the first water blocking cylinder 311 and cannot impact on flocculates outside the first water blocking cylinder 311, so that compared with the prior art, the flocculates of the whole settling tank can be impacted, in this embodiment, only impact is performed inside the first water blocking cylinder 311, 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, flocculates in the first water blocking cylinder 311 cannot flow to the water outlet.

The first water blocking cylinder 311 is higher than the water outlet and penetrates through the bottom, when sewage flows, the sewage can flow downwards in the first water blocking cylinder 311, passes through the first water blocking cylinder 311 from the bottom of the first water blocking cylinder 311 and then flows upwards, is discharged from the water outlet, and the flowing distance of the sewage in the settling tank 31 is increased, so that the flowing time of the sewage in the settling tank 31 is increased, and the sewage and the medicament are fully reacted and flocculated to remove sewage pollutants.

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

In this embodiment, only the first water blocking cylinder 311 and the second water blocking cylinder 312 are provided in the first-stage settling tank 31, and a medicine feeding mechanism is connected thereto. As one embodiment, the first water blocking cylinder 311 and the second water blocking cylinder 312 may be provided in the second-stage and third-stage settling tanks 31, and a medicine feeding mechanism may be connected thereto to enhance the settling effect.

As shown in fig. 4 and 5, the sewage pump drain pipe 23 is provided with a chemical mixing chamber 231 for mixing the chemical carried by the chemical feeding mechanism with the sewage carried by the sewage pumping device 2, and the inside diameter of the chemical mixing chamber 231 is larger than the inside diameter of the sewage pump drain pipe 23.

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

As shown in fig. 4 and 5, the feeding mechanism includes a first feeding assembly for adding PAC medicament to the liquid medicine mixing chamber 231 for mixing, and a second feeding assembly for adding PAM medicament to the second water blocking cylinder 312 for mixing.

The first dosing assembly comprises a first canister 313, a first metering pump 314, and a first dosing tube 315; the inlet pipe of the first metering pump 314 is inserted into the first medicine tank 313, the outlet is connected with the first medicine feeding pipe 315, and the first medicine feeding pipe 315 is connected to the sewage pump drain pipe 23 in front of the medicine liquid 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, wherein an inlet pipe of the second metering pump 317 is inserted into the second medicine tank 316, an outlet is connected with the second medicine feeding pipe 318, and the second medicine feeding pipe 318 is connected to a sewage pump drain pipe 23 in front of the second water blocking cylinder 312 and is positioned behind the medicine liquid mixing cavity 231.

In this embodiment, by providing two medicaments (PAC medicament and PAM medicament), the two medicaments are fully mixed with the sewage in the liquid medicine mixing chamber 231 and the second water blocking cylinder 312, so that the pollutants in the sewage are settled and removed.

For a better understanding of the present utility model, the following is a complete description of the principles of the utility model:

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

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 the sludge at the bottom of the fishpond is stirred with water.

The sewage pump 21 works, sewage containing sludge is stirred and pumped below the sewage pump through the aeration disc 13, and the sewage containing sludge is sequentially sent into the first-stage settling tank 31 of the purifying device 3 for purification through the sewage pump water inlet pipe 22, the sewage pump 21 and the sewage pump water outlet pipe 23.

Specifically, while the sewage pump drain pipe 23 is delivering sewage, the first metering pump 314 and the second metering pump 317 are operated, the PAC reagent mixture in the first reagent tank 313 is delivered to the first reagent feeding pipe 315 by the first metering pump 314, and delivered to the sewage pump drain pipe 23 through the first reagent feeding pipe 315, and flows into the liquid medicine mixing cavity 231 along with sewage, and in the liquid medicine mixing cavity 231, the PAC reagent mixture is fully mixed with sewage, and delivered to the settling tank 31 through the sewage pump drain pipe 23 after being mixed.

The PAM agent mixture in the second drug tank 316 is fed into the second drug feeding pipe 318 by the second metering pump 317, fed into the sewage pump drain pipe 23 through the second drug feeding pipe 318, and flowed into the second water blocking cylinder 312 along with sewage, and the PAM agent mixture was sufficiently mixed with the sewage in the second water blocking cylinder 312.

As shown in fig. 5, PAC chemical, PAM chemical, sewage contaminants (including sludge) and the like are contained in the mixed liquid in the second water blocking cylinder 312, the mixed liquid flows upward in the second water blocking cylinder 312, turns over the second water blocking cylinder 312 and flows downward, passes through the first water blocking cylinder 311 from the bottom of the first water blocking cylinder 311 and flows upward, and is discharged from the water outlet into the next-stage settling tank 31 to be settled sequentially.

The sewage finally enters the tail tank 32, ozone is added into the tail tank 32, various organic matters and inorganic matters in the sewage are oxidized by using the ozone as an oxidant, and the sewage after being treated by the tail tank 3 is discharged into the fish pond.

As sewage flows in the settling tank 31 and the tail tank 32, sediment (including sludge) settles at the bottom thereof. When it is desired to discharge the sediment (including sludge) in the settling tank 31 and the tail tank 32, the sediment (including sludge) in the settling tank 31 and the tail tank 32 is discharged through the drain pipe 42.

During blowdown, contaminants at the bottoms of settling tank 31 and tailing tank 32 enter blowdown outlet 432 through a plurality of downward blowdown channels 431 and then enter blowdown pipe 42. In the drain pipe 42, the pollutant filter 41 filters pollutants, reducing the subsequent treatment time and treatment workload for pollutants.

When the contaminant filter 41 filters contaminants, the inner filter 423 filters small particle contaminants and the outer filter 424 filters large particle contaminants. The aperture of the filtering hole of the inner layer filtering net 423 is smaller, when the filtering hole of the inner layer filtering net 423 is blocked by the pollutant with large particles, the rest pollutant can be filtered by the outer layer filtering net 424, namely, the pollutant can be filtered by the outer layer filtering net 424.

During sewage disposal, when the outlet flow rate of the sewage pipe 41 is small, it indicates that both the inner filter 423 and the outer filter 424 of the pollutant filter 42 are blocked, and at this time, the pollutant filter 42 needs to be detached and replaced with a new pollutant filter 42.

The dredging and bottom-changing purification system for the fishpond provided by the utility model is not limited to dredging and bottom-changing purification for the fishpond, and can be applied to dredging and bottom-changing purification for other aquaculture ponds.

While the embodiments of the present utility model have been described in detail, the present utility model is not limited to the embodiments described above, and various equivalent modifications and substitutions can be made by those skilled in the art without departing from the spirit of the present utility model, and these are intended to be included in the scope of the present utility model as defined in the appended claims.

Claims (8)

1. The utility model provides a drain of dredging of pond changes end purification, its characterized in that, including being used for discharging sewage drain pipe (41) of sedimentation pollutant after the pond sewage purification, install a plurality of detachable pollutant filters (42) on sewage drain pipe (41) along pollutant flow direction, be provided with the filter screen of different filtration apertures in pollutant filters (42).

2. A sewage drain according to claim 1, wherein the pollutant filter element (42) comprises a filter screen mounting pipe (421) and a filter screen plate (422), the filter screen mounting pipe (421) extending back and forth, the filter screen plate (422) being located within the filter screen mounting pipe (421) and having a plurality of filter apertures of different apertures disposed therein.

3. The sewage draining device according to claim 2, wherein the filter screen plate (422) comprises an inner filter screen (423) on the inner side and an outer filter screen (424) on the outer side, the inner filter screen (423) is located inside the outer filter screen (424), and the filter pore diameters of the inner filter screen and the outer filter screen are different.

4. A sewage draining device according to claim 3, wherein the pore size of the filter pores of the inner filter screen (423) is smaller than the pore size of the filter pores of the outer filter screen (424).

5. A drain according to claim 2, wherein the port inner side wall of the filter screen mounting pipe (421) is sleeved on the port outer side wall of the drain pipe (41) and detachably and sealingly connected by a hoop.

6. A sewage drain according to claim 1, wherein the inlet end of the sewage drain pipe (41) is provided with a sewage drain inlet pipe network (43), a plurality of downward sewage drain channels (431) are arranged on the sewage drain inlet pipe network (43), the downward sewage drain channels (431) are converged to a sewage drain outlet (432), and the sewage drain outlet (432) is connected with the inlet end of the sewage drain pipe (41).

7. A sewage disposal device according to claim 6, wherein the sewage disposal inlet pipe network (43) is provided at the inner bottom end of the settling tank of the pond dredging bottom-modifying purification apparatus.

8. A pond dredging bottom-modifying purification system for a sewage disposal device according to any one of claims 1 to 7, comprising:

a pretreatment device (1) which is arranged in the fish pond and is used for pretreating the sewage in the fish pond;

a sewage extraction device (2) for extracting the sewage pretreated by the pretreatment device (1), wherein the water inlet end of the sewage extraction device (2) is arranged in the fishpond and is positioned in or beside the pretreatment device (1);

the sewage treatment device comprises a sewage extraction device (2) and a purification device (3) for purifying sewage extracted by the sewage extraction device (2), wherein a sewage inlet end of the purification device (3) is connected with an output end of the sewage extraction device (2), and a purified water outlet end of the purification device (3) is connected into a fish pond;

and the sewage discharging device (4) is used for discharging the settled pollutants purified by the purifying device (3), and the inlet end of the sewage discharging device (4) is connected with the sewage discharging end of the purifying device (3).