CN110467330B - Circulating water fish manure sewage concentration device and circulating water fish manure sewage concentration recycling system - Google Patents

Abstract

The invention discloses a circulating water fish-farming manure sewage concentration device and a circulating water fish-farming manure sewage concentration recycling system, wherein a rotary drum is rotatably connected to a frame, water filtering holes are distributed on the rotary drum, the rotary drum is driven by a motor to rotate around the central shaft, one end of the rotary drum is closed, the other end of the rotary drum is open, the open end is a water inlet end, a blowing device and a spray pipe are arranged above the rotary drum, the blowing device is connected with an air compressor or a high-pressure air tank and blows air into the rotary drum, the lower side of the spray pipe is provided with a plurality of water spraying ports or water spraying heads which spray water towards the rotary drum, the central shaft of the rotary drum is a hollow shaft, a manure receiving hopper is arranged on the central shaft, the bottom end of the manure receiving hopper is communicated with the central shaft, and the top end opening of the manure receiving hopper is right below the blowing device and the spray pipe; the excrement in the excrement receiving hopper is discharged from one end of the central shaft far away from the water inlet end. The concentration of the fish manure sewage can be further improved and can reach more than 5%, the water consumption is low, and the energy consumption and the cost of the subsequent biochemical treatment are low.

Description

A circulating water fish farming and fish excrement sewage concentration device and circulating water fish excrement sewage concentration reuse system

Technical field

The invention relates to a circulating water fish culture and fish excrement sewage concentration device and a circulating water fish culture sewage sewage concentration and reuse system, and belongs to the field of water treatment.

Background technique

The density of fish farming in circulating water is high, and the average feeding amount is between 1% and 1.2%. A large amount of feces and residual bait will be produced every day. At present, the methods of increasing the amount of circulating water and increasing the amount of water exchange are commonly used in China to remove feces from fish ponds. and residual bait. A large amount of sewage is filtered by a microfilter and then treated aerobically. The treated tail water is used for vegetable planting or artificial wetland purification, and is finally discharged to meet standards.

Due to the large amount of sewage, high energy consumption in the treatment process, large facility capacity, high construction investment, and large waste of water resources, these problems comprehensively affect the healthy development of circulating water fish farming. Therefore, how to better reduce aerobic treatment energy consumption and reduce treatment costs has become a problem we need to solve.

At present, fish manure and residual bait in circulating water culture are generally filtered by microfilters. The average concentration of backwash sewage is between TS0.1% and 0.2%. The concentration is low, the amount of sewage is large, the post-processing pressure is high, and the cost is high.

Contents of the invention

In view of the above technical problems, the first object of the present invention is to provide a fish excrement and sewage concentration device for circulating water fish farming, which can further increase the concentration of fish excrement and sewage to >5%. The second purpose is to provide a circulating water fish manure sewage concentration and reuse system.

In order to achieve the above-mentioned first purpose, the technical solution of the present invention is: a circulating water fish farming fish excrement sewage concentration device, including a frame, a central shaft of a rotating drum is connected to the frame, and the rotating drum passes through the axes at both ends of it. The sleeve is placed on the central axis. There are a number of water filter holes distributed on the drum. The drum is driven by a reduction motor to rotate around its central axis. One end of the drum is closed and the other end is open. The open end is for the inlet. At the water end, an air blowing device and a spray pipe are provided above the outside of the drum along the extending direction of the central axis of the drum. The air blowing device is connected to an air compressor or a high-pressure gas tank. The air blowing device can Blow air into the rotating drum. The lower side of the spray pipe is provided with a number of water spray nozzles or water spray heads that spray water into the rotating drum. The central axis of the rotating drum is a hollow shaft. On the central axis There is a excrement receiving bucket. The bottom end of the dung receiving bucket is connected with the central axis. The top opening of the dung receiving bucket is just below the air blowing device and the spray pipe. The top end of the dung receiving bucket extends along the length direction of the air blowing device. The feces water in the feces receiving bucket is discharged from the end of the central axis away from the water inlet end.

Using the above solution, the air blowing device is connected to the air compressor or high-pressure gas tank, and the spray pipe is connected to the backwash pump. The fish excrement sewage discharged from the bottom and middle and upper layers of the fish pond enters the fish excrement collection tank, and is pumped from the water inlet end into the drum through a lifting pump. The drum rotates around the central axis. As the drum rotates, fish excrement and residual bait are attached to the drum. On the inner surface of the drum, clean water is discharged through the drum. Fish feces and residual bait attached to the inner surface of the drum will block the water filter hole, resulting in a reduction in the filter hole's passing capacity and a gradual increase in the water level in the drum. Install the air compressor or high-pressure gas tank on the pipe connecting the air blowing device. Compressed air solenoid valve. When the water surface reaches a certain height, the compressed air solenoid valve installed on the pipe connected to the air blowing device opens. The compressed air flow is blown from the outer surface of the drum to the inner surface through the air blowing device and adheres to the inner surface of the drum. The fish manure and residual bait are blown off, fall into the manure receiving bucket, and are discharged through the outlet end of the central shaft into the anaerobic fermentation tank. The function of the water spray pipe is to adjust the TS concentration of the concentrate, and adjust the water output of the spray pipe to reduce or increase the TS concentration of the concentrate.

In the above solution: the frame is a water receiving box with an upper end, and central axis mounting seats are symmetrically arranged on opposite sides of the top of the water receiving box, and the two ends of the central axis are respectively fixed on the central axis mounting seats on both sides. , the water receiving tank is provided with a clean water outlet. The clean water enters the water receiving tank through the drum water filter hole, and then is discharged from the water receiving tank to the return pool.

The frame is a cube or rectangular frame surrounded by transverse beams and vertical beams. The transverse beams on opposite sides of the top end are symmetrically provided with central axis mounting seats, and the two ends of the central axis are respectively fixed on both sides. on the central axis mounting base. The rack is installed directly above the return pool, and the clean water leaked from the drum directly enters the return pool.

In the above solution: the rotating drum includes a cylindrical shell surrounded by filter sheets. One end of the cylindrical shell is closed, and the inner wall of the other end is connected to the shaft sleeve through a supporting frame. At the closed end of the cylindrical shell A shaft sleeve is also provided at the center of the end face.

In the above solution, a driven gear is mounted on the sleeve of one end of the rotating drum, and the driven gear meshes with the driving gear on the output shaft of the reduction motor. The motor drives the gear to rotate, thereby driving the drum to rotate around its central axis.

In the above solution, an arc-shaped water inlet with high ends and a low middle is provided inside the frame. The water inlet is provided with a water inlet pipe on one side of the frame. The water inlet pipe extends outside the frame. The lower end of the open end of the drum overlaps the notch on the side of the water inlet trough away from the water inlet pipe, and a seal is provided between the water inlet trough and the drum. The seal is close to the drum, thereby strictly separating the inside and outside of the drum, ensuring that the water entering the water inlet enters the drum from the water inlet end of the drum.

In the above solution: the air blowing device is an air knife. Its function is to blow off the fish feces and residual bait adsorbed on the inner wall of the drum mesh to clean the drum mesh.

In the above solution: the other two opposite sides of the top of the frame are provided with cover support frames, the cover is supported above the drum through the cover support frame, and the air blowing device and the spray pipe are located in the cover. . Reduce water splash during drum operation.

In the above solution, a liquid level sensor is provided in the rotating drum or/and the inlet water tank. When the water surface touches the liquid level sensor, the compressed air solenoid valve installed on the pipe connected to the air blowing device opens.

The second object of the present invention is achieved as follows: a circulating water fish farming sewage concentration and reuse system, including a fish pond, bottom sewage and pool surface sewage of the fish pond are discharged into the fish dung collection tank, and is characterized in that: The wastewater in the fish excrement collection tank is pumped to the circulating fish fish excrement sewage concentration device through a lifting pump for concentration, and the clean water from the drum filter hole is discharged into the return pool, and the water in the return pool passes through the backflow Pump to the filter, the water outlet of the filter is connected to the ultraviolet sterilizer, the water outlet of the ultraviolet sterilizer is connected to the biological filter bed, and the water from the biological filter bed flows back into the fish pond; the connection The sewage in the excrement bucket enters the subsequent biochemical reaction system.

In the above solution: the water in the return pool is also pumped to the spray pipe through the backwash pump.

Beneficial effects: The circulating water fish excrement sewage concentration device of the present invention adopts pressure air backwashing, and the amount of sewage is 96%-98% less than the general microfiltration machine water backwashing, thus greatly saving the water consumption of circulating water fish farming. It also reduces the pressure of biochemical treatment of circulating water and increases the concentration of sewage from the fish excrement concentrator. The TS concentration of fish excrement sewage can reach an average of more than 5%. And this device can adjust the concentration of backwash dirt TS at will by adjusting the water volume of the water spray pipe. Anaerobic biochemical treatment of sewage with higher TS concentration consumes less energy than general aerobic treatment, has smaller facility capacity and requires less investment.

Description of the drawings

Figure 1 is a schematic structural diagram of the present invention.

Figure 2 is a right side view of Figure 1.

Figure 3 is a left side view of Figure 1 with the reduction motor removed.

Figure 4 is a top view of Figure 1.

Figure 5 is a schematic structural diagram of Embodiment 2.

Figure 6 is a flow chart of the circulating water fish manure sewage concentration and reuse system.

Detailed ways

The present invention will be further described below through examples and in conjunction with the accompanying drawings:

The position words such as front, back, left, right, top, and bottom in the present invention only represent the relative position in the figure and do not represent the absolute position of the product.

Embodiment 1, as shown in Figures 1-4, the circulating water fish excrement sewage concentration device consists of a frame 1, a rotating drum 2, a reduction motor 3, a central shaft 4, an air blowing device 5, a spray pipe 6, a central shaft It consists of a mounting base 7, a driven gear 8, a driving gear 9, an inlet tank 10, a seal 11, a support frame 12, a cover 13, a cover support frame 14, a liquid level sensor 15, a water inlet pipe 16, and a manure receiving bucket 17.

Frame 1 is a water receiving tank with an open upper end, which facilitates the collection of clean water. Central axis mounting seats 7 are symmetrically provided on opposite sides of the top of the water receiving tank, and a clean water outlet (not shown in the figure) is provided on the water receiving tank.

A rotating drum 2 is rotatably connected to the frame 1. One end of the rotating drum 2 is closed and the other end is open. The open end is the water inlet end. There are a number of tiny water filter holes distributed on the drum 2. Preferably, the drum 2 includes a cylindrical shell surrounded by filter sheets. One end of the cylindrical shell is closed by an end plate, and the inner wall of the other end is passed by a supporting frame 12. Connected to the central shaft sleeve 201, a shaft sleeve 201 is also provided at the center of the end face of the closed end of the cylindrical housing. The central shaft 4 is a hollow shaft. Both ends of the central shaft 4 are respectively fixed on the central shaft mounting seats 7 on both sides. The other two opposite sides of the water receiving box are provided with cover support frames 14, and the cover shell 13 is supported above the rotating drum 2 through the cover support frames 14.

The drum 2 is driven by the reduction motor 3 to rotate around its central axis 4. Specifically, the sleeve 201 at one end of the drum 2 is covered with a driven gear 8. It is preferred that the driven gear 8 is located at one end away from the water inlet of the drum. The driven gear 8 meshes with the driving gear 9 on the output shaft of the reduction motor 3 .

The side wall of the water receiving tank is provided with a drum water inlet, and the inner wall of the water receiving tank is provided with an arc-shaped inlet trough 10 with high ends and a low middle. That is, the middle of the inlet trough 10 is deep and both ends are upward. The notch of 10 is an arc shape that matches the cylindrical mouth of the lower part of the drum 2. One side of the inlet trough 10 is close to the inner wall of the water tank. The side of the inlet trough 10 that is close to the inner wall of the water tank is provided with a water inlet pipe 16. The water pipe 16 extends through the drum water inlet to the outside of the water receiving tank. The lower end of the open end of the drum 2 overlaps the notch on the side of the water inlet trough 10 away from the water inlet pipe 16. A seal 11 is provided between the water inlet trough 10 and the drum 2.

An air blowing device 5 and a spray pipe 6 are arranged above the outside of the drum 2 along the extending direction of the central axis 4 of the drum 2. The air blowing device 5 and the spray pipe 6 are located in the cover 13. The air blowing device 5 is connected to an air compressor or a high-pressure air tank. The air blowing device 5 blows air into the rotating drum 2. Preferably, the air blowing device 5 is an air knife. The lower side of the spray pipe 6 is provided with a number of water spray nozzles or water spray heads for spraying water into the drum 2 .

A manure receiving bucket 17 is provided on the central axis 4. The bottom end of the manure receiving bucket 17 is connected with the central axis 4. When the top opening of the manure receiving bucket 17 is rotated to the top, it can be located just below the air blowing device 5 and the spray pipe 6. The manure receiving bucket 17 can receive manure. The top of the bucket 17 extends along the length direction of the air blowing device 5 . The sewage in the excrement receiving bucket 17 is discharged from the end of the central axis 4 away from the water inlet end. The reduction motor 3, the driving gear 9 and the driven gear 8 are located at the end of the central axis 4 away from the water inlet end. A liquid level sensor 15 is provided in the rotating drum 2 and/or the water inlet 10 .

Example 2

As shown in Figure 5, everything else is the same as in Embodiment 1. The difference is that the frame 1 is a cube or rectangular frame surrounded by transverse beams and vertical beams. The transverse beams on opposite sides of the top end are symmetrically provided with central axes. Mounting seats 7, the two ends of the central shaft 4 are respectively fixed on the central shaft mounting seats 7 on both sides. The other two transverse beams on opposite sides are provided with cover support frames 14, which support the cover shell 13 through the cover support frames 14. The inlet water tank 10 is directly located inside the transverse beams, and the water inlet pipe 16 is provided on one side of the water inlet channel 10 against the transverse beams. , the water inlet pipe 16 extends outside the frame. The rack 1 is installed directly above the return pool, and clean water is directly discharged into the return pool.

Example 3

As shown in Figure 6, the circulating water fish excrement sewage concentration and reuse system includes the fish pond 18. The bottom sewage and surface sewage of the fish pond 18 are discharged into the fish excrement collection tank 19. First, the excrement residue in the middle and upper part of the fish pond water level is The bait is discharged into the fish excrement collection tank through the surface discharge port; secondly, the excrement residual bait water at the bottom of the fish pond is collected by the excrement collector and then discharged to the fish excrement collection tank 19.

The wastewater in the fish excrement collection tank 19 is pumped to the circulating fish fish excrement sewage concentration device of Embodiment 1 or 2 through the lift pump 20 for concentration, and the clean water coming out of the filter hole of the drum 2 is discharged into the return pool 21, and the return pool The water in 21 is pumped to the filter 23 through the return pump 22. The water outlet of the filter 23 is connected to the ultraviolet sterilizer 24 to remove pathogenic microorganisms in the water, including bacteria, viruses, fungi and other microbial species that are sensitive to the destructive power of ultraviolet technology.

The water outlet of the ultraviolet sterilizer 24 is connected to the biological filter bed 25. The clean water is aerobically treated in the biological filter bed 25 to remove ammonia nitrogen, nitrite and other harmful substances. The water from the biological filter bed 25 flows back into the fish pond 18; the sewage in the excrement bucket 17 enters the subsequent biochemical reaction system. The biochemical treatment system uses anaerobic reaction first, then aerobic reaction, and then enters the sedimentation tank for sedimentation, biological filter filtration, and finally can be used for vegetable planting, etc. The water in the return pool 21 is also pumped to the spray pipe 6 through the backwash pump 26 .

The present invention is not limited to the above-described embodiments. Those of ordinary skill in the art can understand that various changes, modifications, substitutions and modifications can be made to these embodiments without departing from the principles and purposes of the present invention. The scope of the present invention Defined by the claims and their equivalents.

Claims (7)

1. A circulating water fish excrement and sewage concentration device, including a frame, characterized in that: a central shaft of a rotating drum is connected to the frame, and the rotating drum is sleeved on the central shaft through sleeves at both ends, so There are a number of water filter holes distributed on the drum. The drum is driven by a reduction motor to rotate around its central axis. One end of the drum is closed and the other end is open. The open end is the water inlet end. The outside of the drum An air blowing device and a spray pipe are arranged above the drum along the extending direction of the central axis of the drum. The air blowing device is connected to an air compressor or a high-pressure gas tank. The air blowing device can blow air into the drum, so The lower side of the spray pipe is provided with a number of water spray nozzles or water spray heads that spray water into the rotating drum. The central axis of the rotating drum is a hollow shaft, and a excrement bucket is provided on the central axis. The bottom end of the excrement receiving bucket is connected with the central axis, and its top opening is located just below the air blowing device and the spray pipe. The top end of the dung receiving bucket extends along the length of the air blowing device. Sewage is discharged from one end of the central axis away from the water inlet end; the rotating drum includes a cylindrical shell surrounded by filter sheets. One end of the cylindrical shell is closed, and the inner wall of the other end is connected to the shaft sleeve through a supporting frame. A shaft sleeve is also provided at the center of the closed end face of the cylindrical shell; an arc-shaped water inlet with high ends and a low center is provided on the inside of the frame, and a water inlet pipe is provided on one side of the water inlet near the frame. , the water inlet pipe extends outside the frame, the lower end of the open end of the drum overlaps the notch on the side of the water inlet trough away from the water inlet pipe, and a seal is provided between the water inlet trough and the drum; The frame is a water receiving box with an open upper end, and central axis mounting seats are symmetrically arranged on opposite sides of the top of the water receiving box. The two ends of the central axis are respectively fixed on the central axis mounting seats on both sides. The water tank is provided with a clean water outlet. 2. The circulating water fish excrement and sewage concentration device according to claim 1, characterized in that: the frame is a cube or rectangular frame surrounded by transverse beams and vertical beams, and the transverse sides of the opposite sides of the top are A central axis mounting seat is symmetrically arranged on the beam, and the two ends of the central axis are respectively fixed on the central axis mounting seats on both sides. 3. The circulating water fish farming and fish excrement sewage concentration device according to claim 2, characterized in that: the shaft sleeve at one end of the rotating drum is equipped with a driven gear, and the driven gear is connected to the driving gear on the output shaft of the reduction motor. Gear mesh. 4. The circulating water fish excrement and sewage concentration device for fish farming according to claim 3, characterized in that the air blowing device is an air knife. 5. The circulating water fish farming and fish excrement sewage concentration device according to claim 4, characterized in that: the other two opposite sides of the top of the frame are provided with cover support frames, and the cover is supported by the cover support frame. Above the rotating drum, the blowing device and spray pipe are located in the casing. 6. The circulating water fish excrement and sewage concentration device for fish farming according to claim 5, characterized in that: a liquid level sensor is provided in the drum or/and the inlet tank. 7. A circulating water fish excrement sewage concentration and reuse system, including a fish pond, bottom sewage and pool surface sewage discharged into a fish excrement collection tank, characterized in that: the wastewater in the fish excrement collection tank is lifted The pump is pumped to the circulating water fish farming fish excrement sewage concentration device described in any one of claims 1 to 5 for concentration, and the clean water coming out of the drum filter hole is discharged into the return pool, and the water in the return pool passes through the return pump. Pump to the filter, the water outlet of the filter is connected to the ultraviolet sterilizer, the water outlet of the ultraviolet sterilizer is connected to the biological filter bed, and the water from the biological filter bed flows back into the fish pond; the feces collector The fecal water in the bucket enters the subsequent biochemical reaction system.