Eel breeding tail water treatment system

Abstract

The utility model relates to an eel breeding tail water treatment system which comprises a breeding pond, a tail water outlet of the breeding pond is connected with a water inlet of a rotational flow sedimentation pond, a water outlet of the rotational flow sedimentation pond is connected with a water inlet of a fiber filter, and a sewage draining exit of the rotational flow sedimentation pond is connected with a sludge inlet of a sewage treatment subsystem. Lower-layer sludge in the rotational flow sedimentation tank enters the sewage treatment subsystem for secondary solid-liquid separation, a water outlet of the fiber filter is connected with a water inlet of the clean water tank, and a water outlet of the clean water tank is connected with a water inlet of the culture tank. By arranging the rotational flow sedimentation tank and the fiber filter and based on a water circulation mode, the eel breeding tail water can be treated to obtain clear water meeting the eel breeding requirement, the clear water flows back to the breeding pond to be supplemented with breeding water, and therefore cyclic utilization of the breeding water is achieved, growth of eels is facilitated, and water resources are effectively saved.

Description

TECHNICAL FIELD

[0001] The utility model relates to wastewater treatment technical field especially a kind of eel tail water treatment system. BACKGROUND

[0002] With the rapid development of aquaculture, efficient eel culture technology appears, which can significantly improve the breeding efficiency.

[0003] In prior art, eel farm usually uses closed breeding pond to breed eel, and regularly replaces pond water to maintain water quality, the water in breeding pond cannot be effectively circulated, and a large amount of new water is often needed to supplement to maintain good breeding environment and ensure the normal growth of eel and other cultured organisms; this method has the following problems:

[0004] (1) The eel tail water contains a large amount of particulate pollutants, if discharged directly without collection and treatment, it will aggravate the degree of water eutrophication and water pollution, and cause damage to the surrounding ecological environment;

[0005] (2) Due to the high viscosity of the breeding water, the capacity of the tail water treatment equipment is required to be very high;

[0006] (3) Centralized water replacement results in large single drainage volume and short time, according to ten thousand cubic breeding water, the single drainage volume is 2000m³, and the hourly drainage volume is about 1000m³, which not only wastes valuable water resources, but also may cause stress to eel due to improper operation during water replacement, which is not conducive to the growth of eel. INVENTION CONTENTS

[0007] Therefore, it is necessary to provide an eel tail water treatment system to solve the problems of difficult follow-up treatment of eel tail water, high performance requirement of treatment equipment, waste of water resources and not conducive to the growth of eel caused by the need for regular centralized replacement of pond water to maintain the water quality in eel breeding pond in prior art.

[0008] The technical solution adopted by the utility model is as follows:

[0009] An eel tail water treatment system, comprising a breeding pond, a tail water outlet of the breeding pond is connected with a water inlet of a cyclone sedimentation tank, a water outlet of the cyclone sedimentation tank is connected with a water inlet of a fiber filter, a sewage outlet of the cyclone sedimentation tank is connected with a sludge inlet of a sewage treatment subsystem, the lower sludge in the cyclone sedimentation tank is subjected to secondary solid-liquid separation in the sewage treatment subsystem, a water outlet of the fiber filter is connected with a water inlet of a clean water tank, and a water outlet of the clean water tank is connected with a water inlet of the breeding pond.

[0010] The tail water in the culture pond enters a cyclone sedimentation tank for solid-liquid separation, and the upper clear liquid in the cyclone sedimentation tank flows into a clear water pond through a fiber filter, thereby supplementing the culture water in the culture pond.

[0011] As a further improvement of the above technical solution:

[0012] The sewage treatment subsystem comprises a sewage collecting tank connected with the sewage outlet of the cyclone sedimentation tank, a sewage outlet of the sewage collecting tank is connected with a sewage inlet of an air flotation machine, a clear water outlet of the air flotation machine is connected with a water inlet of a biological digestion tank, a scum outlet of the air flotation machine is connected with a sludge inlet of a sludge tank, a sludge outlet of the sludge tank is connected with a sludge inlet of a plate-and-frame filter press, and a sewage outlet of the plate-and-frame filter press is connected with a sewage inlet of the sewage collecting tank.

[0013] The water inlet of the biological digestion tank is also connected with a water outlet of a buffer tank.

[0014] The water inlet of the buffer tank is connected with a water outlet of the clear water pond, and another water outlet of the buffer tank is connected with a water inlet of the culture pond.

[0015] A dosing device is installed on the air flotation machine in cooperation, and the dosing device punches biological flocculants into the air flotation machine.

[0016] A filtering assembly for filtering is installed in the fiber filter in cooperation.

[0017] The filtering assembly comprises at least one filtering disc, and the outer surface of each filtering disc is wrapped with fiber filter cloth.

[0018] At least one connecting rod is further included, one end of each connecting rod is hingedly connected with the fixed cantilever, and the other end of each connecting rod is hingedly connected with a sludge suction box, the sludge suction boxes are arranged in one-to-one correspondence with the filtering discs, two adjacent sludge suction boxes are connected through springs, and under the action of the springs, the suction nozzle of each sludge suction box is pressed against the fiber filter cloth on the corresponding filtering disc.

[0019] The water outlet pipe and the water inlet pipe are installed on the side wall surface of the cyclone sedimentation tank in a spaced manner from top to bottom, and the water inlet pipe enters the inside of the cyclone sedimentation tank along the tangent line of the side wall surface of the cyclone sedimentation tank.

[0020] A conical slope is arranged on the inside of the side wall surface of the cyclone sedimentation tank below the water inlet pipe.

[0021] A water turning weir is installed on the inside of the side wall surface of the cyclone sedimentation tank in a circumferential direction, and the water turning weir is arranged in an inclined manner, so that a water collecting groove with a width decreasing from top to bottom is formed between the water turning weir and the inside of the side wall surface of the cyclone sedimentation tank, and the water collecting groove is in communication with the water outlet pipe.

[0022] The cyclone sedimentation tank has the following beneficial effects:

[0023] The utility model discloses compact, reasonable, convenient operation, through setting up cyclone sedimentation tank, fibre filter, based on water circulation mode, can satisfy the clear water of eel tail water treatment to the requirement of eel, clear water flow back to the breeding pond and breed water supplement, thereby realizing the recycling of breeding water, is favorable for eel growth, effectively saves water resource.

[0024] The utility model also has the following advantages:

[0025] (1) the utility model discloses whole process only once water, and the tail water that is lifted from the breeding pond is completely completed subsequent process through the self-flow mode, effectively saves secondary water lifting cost, and can minimize the disturbance to the particulate in the water body in the cyclone sedimentation tank, effectively reduces the subsequent processing difficulty and processing cost.

[0026] (2) the utility model discloses through setting up the tangent of along cyclone sedimentation tank lateral surface and entering its inside water inlet pipe and conical slope, can make the tail water of entering cyclone sedimentation tank push the water body in the inside cyclone sedimentation tank and rotate and rise along certain rotation direction.

[0027] (3) the utility model discloses through setting up the water weir, can block the particulate in the inside cyclone sedimentation tank and rise, and the blocked particulate will sink to the bottom from the blow-off pipe under the action of the cyclone of the water body in the pool.

[0028] (4) the utility model discloses through setting up the air flotation sedimentation tank in the air flotation machine, and integration in its front end, can make the sewage enter the air flotation machine, first carries out solid-liquid separation through the air flotation sedimentation tank, thereby can deposit the relatively heavy particulate in the sewage, avoids this kind of relatively heavy particulate to enter the air flotation machine rear section and increases its bottom blow-off workload, effectively improves the operation effect and work efficiency of the air flotation machine.

[0029] (5) the utility model discloses through setting up spring, connecting rod, fixed cantilever, makes the suction mud box and filter disc follow, guarantees the pressure of suction mud box suction nozzle and fibre filter cloth and always balanced, guarantees the backwash effect consistency of filter disc, and can avoid unilateral stress too big and cause fibre filter cloth wear and tear, improves the service life of fibre filter cloth.

[0030] (6) the utility model discloses through setting up the fibre filter cloth of three layers structure, its inside is provided with three-dimensional space, and fibre filter cloth surface can form the filter cloth medium with 3mm-5mm effective filtration depth, makes fibre filter cloth can directly intercept adsorption small particle, and filtration efficiency is high, and the manufacturing cost is low, and the pollution capacity is big, is applicable to high viscosity liquid or small diameter particle high efficiency interception, can effectively be applicable to filter eel culture. BRIEF DESCRIPTION OF DRAWINGS

[0031] Figure 1 It is the structure schematic drawing of the utility model.

[0032] Figure 2 It is a structure schematic view of the cyclone sedimentation tank in the utility model.

[0033] Figure 3 It is a structure schematic view of the filtering assembly in the utility model.

[0034] Figure 4 It is Figure 3 It is a local enlarged view of A in the utility model.

[0035] Wherein: 1, breeding pond; 2, cyclone sedimentation tank; 3, fiber filter; 4, clean water pool; 5, buffer tank; 6, sewage collection tank; 7, air flotation machine; 8, sludge tank; 9, plate and frame filter press; 10, biological digestion tank; 11, conical slope; 12, water turning weir; 13, water collecting ditch; 14, sewage pipe; 15, water inlet pipe; 16, water outlet pipe; 17, dosing device; 18, ozone generator;

[0036] 301, filter disc; 302, fixed cantilever; 303, suction box; 304, spring; 305, connecting rod. DETAILED DESCRIPTION

[0037] The specific implementation of the utility model will be described below in combination with the drawings.

[0038] The structure and function of the utility model are as follows:

[0039] As Figures 1-4 shown, a eel tail water treatment system, including breeding pond 1, the tail water outlet of breeding pond 1 is connected with the water inlet of cyclone sedimentation tank 2, the water outlet of cyclone sedimentation tank 2 is connected with the water inlet of fiber filter 3, the sewage outlet of cyclone sedimentation tank 2 is connected with the sludge inlet of sewage treatment subsystem, the lower sludge in cyclone sedimentation tank 2 enters sewage treatment subsystem to carry out secondary solid-liquid separation, the water outlet of fiber filter 3 is connected with the water inlet of clean water pool 4, the water outlet of clean water pool 4 is connected with the water inlet of breeding pond 1; the tail water in breeding pond 1 enters cyclone sedimentation tank 2 to carry out solid-liquid separation, the upper clear liquid in cyclone sedimentation tank 2 flows into clean water pool 4 after filtering by fiber filter 3, to replenish the breeding water of breeding pond 1. By setting cyclone sedimentation tank 2 and fiber filter 3, based on water circulation mode, the eel tail water can be treated by solid-liquid separation, to obtain clean water meeting the requirements of eel breeding, the clean water flows back to breeding pond 1 to replenish the breeding water, to realize the recycling of breeding water, which is beneficial to the growth of eel and effectively saves water resources. In addition, the whole process of the tail water treatment system of the utility model only lifts water once, the tail water lifted from breeding pond 1 is completely completed by subsequent processes in the way of gravity flow, effectively saving the cost of secondary water lifting, and the disturbance to the particulate matter in the water body in cyclone sedimentation tank 2 can be minimized, to effectively reduce the difficulty and cost of subsequent treatment.

[0040] The sewage treatment subsystem comprises a sewage collecting tank 6 connected with the sewage outlet of the cyclone sedimentation tank 2, a sewage outlet of the sewage collecting tank 6 is connected with a sewage inlet of the air flotation machine 7, a clean water outlet of the air flotation machine 7 is connected with a water inlet of the biological digestion tank 10, a scum outlet of the air flotation machine 7 is connected with a sludge inlet of the sludge tank 8, a sludge outlet of the sludge tank 8 is connected with a sludge inlet of the plate-and-frame filter press 9, and a sewage outlet of the plate-and-frame filter press 9 is connected with a sewage inlet of the sewage collecting tank 6. The sewage outlet of the cyclone sedimentation tank 2 is connected with the sludge inlet of the sewage collecting tank 6 through a sewage pipe 14, the sewage pipe 14 is a pre-embedded pipeline made of UPVC hard polyvinyl chloride, and the sludge in the cyclone sedimentation tank 2 flows into the sewage collecting tank 6 through the sewage pipe 14 for secondary solid-liquid separation treatment.

[0041] The cyclone sedimentation tank 2 is used for preliminarily separating solid and liquid in the eel tail water, as shown in Figure 2 The cyclone sedimentation tank 2 is integrally poured or built by using a glass steel assembled structure, the water inlet pipe 15 and the water outlet pipe 16 are made of UPVC hard polyvinyl chloride and are light and durable.

[0042] A conical slope 11 is arranged on the inner side wall of the cyclone sedimentation tank 2 below the water inlet pipe 15. The cyclone sedimentation tank 2 adopts a tangential feeding mode, the tail water enters the inside of the cyclone sedimentation tank 2 along the tangent of the side wall of the cyclone sedimentation tank 2, and the water body in the cyclone sedimentation tank 2 rotates and rises along a certain rotation direction (counterclockwise in the northern hemisphere and clockwise in the southern hemisphere) by relying on the flow rate and the action of the conical slope 11.

[0043] A water turning weir 12 is circumferentially arranged on the inner side wall of the cyclone sedimentation tank 2, and the water turning weir 12 is arranged obliquely to form a water collecting groove 13 with a width decreasing from top to bottom between the water turning weir 12 and the inner side wall of the cyclone sedimentation tank 2, and the water collecting groove 13 is correspondingly connected with the water outlet pipe 16. By arranging the water turning weir 12, the particles in the cyclone sedimentation tank 2 can be blocked from rising, and the blocked particles sink to the bottom of the tank and are discharged through the sewage pipe 14 under the action of the rotating flow of the water body in the tank, the water turning weir 12 is made of a 1.0 mm thick 304 stainless steel plate, and the connection between the water turning weir 12 and the side wall of the cyclone sedimentation tank 2 is sealed by using cement.

[0044] The tail water in the breeding tank 1 flows into the inside of the cyclone sedimentation tank 2 through the water inlet pipe 15, the tail water in the inside of the cyclone sedimentation tank 2 collides with the conical slope 11 under the action of the flow rate, so that a rotating and rising water flow is formed in the inside of the cyclone sedimentation tank 2, and then the upper water body in the inside of the cyclone sedimentation tank 2 overflows the water turning weir 12 into the water collecting groove 13, and the water body in the water collecting groove 13 flows into the fiber filter 3 through the water outlet pipe 16.

[0045] The water inlet pipe 15 enters the inside of the cyclone sedimentation tank 2 along a tangent of the side wall surface of the cyclone sedimentation tank 2.

[0046] Since the water inlet pipe 15 enters along a tangent of the side wall surface of the cyclone sedimentation tank 2, a part of the lighter particles will rise along the wall with the water flow,

[0047] The water inlet of the biological degradation tank 10 is also connected with a water outlet of the buffer tank 5; the water inlet of the buffer tank 5 is connected with a water outlet of the clean water tank 4, and the other water outlet of the buffer tank 5 is connected with the water inlet of the breeding tank 1. By arranging the biological degradation tank 10, the clean water output by the air flotation machine 7 and / or the excess part of the clean water in the buffer tank 5 can be biologically degraded, further harmful substances in the water body are removed, and the clean water can be discharged after reaching the discharge standard.

[0048] The air flotation machine 7 is cooperatively installed with a dosing device 17, the dosing device 17 punches biological flocculants into the inside of the air flotation machine 7, the biological flocculants can effectively generate hydrogen bonds and van der Waals forces on the surface of colloidal particles in sewage, and have strong adsorption, bridging and net trapping capacity.

[0049] The air flotation machine 7 of the utility model is internally provided with an air flotation sedimentation tank and is integrated at the front end, so that after the sewage enters the air flotation machine 7, the sewage is firstly subjected to solid-liquid separation by the air flotation sedimentation tank, thereby the heavier particles in the sewage can be deposited, and the heavier particles are prevented from entering the rear section of the air flotation machine 7 to increase the work load of the bottom sewage discharge, and the operation effect and working efficiency of the air flotation machine 7 are effectively improved.

[0050] The backwashing sewage discharge port of the fiber filter 3 is connected with the sludge inlet of the sludge collecting tank 6, the fiber filter 3 has a backwashing function and can perform filter cloth self-cleaning, thereby effectively prolonging the service life of the filter cloth.

[0051] The inside of the fiber filter 3 is cooperatively installed with a filtering assembly for filtering, such as Figures 3-4As shown, the structure of the filter assembly is: comprising at least one filter disc 301, the outer surface of the single filter disc 301 is wrapped with fiber filter cloth, further comprising at least one connecting rod 305, one end of the single connecting rod 305 is hinged with the fixed cantilever 302, and the other end of the single connecting rod 305 is hinged with the suction box 303, the suction box 303 is arranged in one-to-one correspondence with the filter disc 301, and the adjacent two suction boxes 303 are connected through the spring 304, under the action of the spring 304, the suction nozzle of the single suction box 303 is pressed against the fiber filter cloth on the corresponding filter disc 301. By arranging the spring 304, the connecting rod 305 and the fixed cantilever 302, the suction box 303 can follow the filter disc 301, and the suction box 303 can always press the corresponding filter disc 301 tightly during the left and right swinging of the filter disc 301, so that the suction nozzle of the suction box 303 is always close to the fiber filter cloth on the corresponding filter disc 301, thereby ensuring that the pressing force between the suction nozzle of the suction box 303 and the fiber filter cloth is always balanced, the reverse washing effect consistency of the filter disc 301 is ensured, and the fiber filter cloth can be prevented from being worn due to excessive unilateral stress, and the service life of the fiber filter cloth is improved.

[0052] In the utility model, the color of the fiber filter cloth is white, and the fiber filter cloth is not subjected to any special bleaching and dyeing treatment, the fiber filter cloth adopts a three-layer structure, a three-dimensional space is arranged between the adjacent two layers, the surface of the fiber filter cloth is densely covered with organic fiber stacks, the organic fiber stacks comprise 50% superfine polyester fibers and 50% modified acrylic fibers, and the polyester fibers are used as supporting bodies; in a dry state, the fiber hairs are in an upright state; in a wet state, the fiber hairs droop, forming a filter cloth medium with an effective filtering depth of 3mm-5mm and an equivalent pore size of 10μm; so that the fiber filter cloth can directly trap and adsorb fine particles, has high filtering efficiency, low manufacturing cost, large dirt capacity, is suitable for high-efficiency trapping of high-viscosity liquid or small-diameter particles, and can be effectively applied to filtering eel culture.

[0053] The ozone generator 18 is arranged in the clean water tank 4, and the ozone generator 18 can disinfect the clean water in the clean water tank 4 by introducing ozone into the clean water, so that the water quality of the clean water in the clean water tank 4 is further improved.

[0054] The working process of the utility model is as follows:

[0055] The tail water in the culture pond 1 enters the cyclone sedimentation tank 2 through the water inlet pipe 15, and under the action of its own flow rate and the conical slope 11, the water body in the cyclone sedimentation tank 2 spirally rises, so that the upper water body in the cyclone sedimentation tank 2 overflows the water overflow weir 12 into the water collecting ditch 13, the water body in the water collecting ditch 13 flows into the fiber filter 3 through the water outlet pipe 16, and after layer-by-layer filtration by the fiber filter cloth on the filter disc 301, becomes clear water, the clear water flows into the clear water pond 4, is disinfected by the ozone generator 18, and then flows into the buffer tank 5, the clear water in the buffer tank 5 flows back to the culture pond 1 to continue to be used as culture water, if the clear water to be used back in the buffer tank 5 is relatively large, the excess part of the clear water can be introduced into the biological digestion tank 10 for further sterilization and disinfection, and after reaching the discharge standard, is discharged;

[0056] The sludge in the cyclone sedimentation tank 2 enters the sludge collecting tank 6 through the sludge discharge pipe 14, under the action of the sludge pump, the sludge in the sludge collecting tank 6 is lifted into the air flotation machine 7, under the action of the biological flocculant added in the air flotation machine 7 by the dosing device 17, the sludge in the air flotation machine 7 is subjected to solid-liquid separation, the upper clear liquid is introduced into the biological digestion tank 10, and after sterilization and disinfection, is discharged; the lower turbid liquid is lifted into the plate-and-frame filter press 12 under the action of the diaphragm pump, is filtered by the plate-and-frame filter press 12, the obtained filtrate is introduced back into the sludge collecting tank 6, and the obtained sludge filter cake is concentrated and transported or composted.

[0057] The above description is an explanation of the utility model, not a limitation of the utility model, the scope defined by the utility model is referred to the claims, and any form of modification can be made within the protection scope of the utility model.

Claims

1. A system for treating eel tail water, characterized by: The application relates to an aquaculture system, which comprises a culture pond (1), a cyclone sedimentation tank (2), a fiber filter (3), a clean water pond (4) and a sewage treatment subsystem. The tail water in the culture pond (1) is separated from the cyclone sedimentation tank (2), the upper clear liquid in the cyclone sedimentation tank (2) is filtered through the fiber filter (3) and then flows into the clean water pond (4), so as to supplement the culture water in the culture pond (1).

2. The water treatment system for eel farming according to claim 1, wherein: The sewage treatment subsystem comprises a sewage collecting tank (6) connected with the sewage outlet of the cyclone sedimentation tank (2), a sewage outlet of the sewage collecting tank (6) is connected with a sewage inlet of an air flotation machine (7), a clean water outlet of the air flotation machine (7) is connected with a water inlet of a biological digestion tank (10), a scum outlet of the air flotation machine (7) is connected with a sludge inlet of a sludge tank (8), a sludge outlet of the sludge tank (8) is connected with a sludge inlet of a plate-and-frame filter press (9), and a sewage outlet of the plate-and-frame filter press (9) is connected with a sewage inlet of the sewage collecting tank (6).

3. The water treatment system for eel farming according to claim 2, wherein: The water inlet of the biological digestion tank (10) is also connected with one water outlet of a buffer tank (5).

4. The water treatment system for eel farming according to claim 3, wherein: The water inlet of the buffer tank (5) is connected with the water outlet of the clean water pond (4), and the other water outlet of the buffer tank (5) is connected with the water inlet of the culture pond (1).

5. The water treatment system for eel farming according to claim 2, wherein: A dosing device (17) is mounted on the air flotation machine (7) and injects biological flocculants into the air flotation machine (7).

6. The water treatment system for eel farming according to claim 1, wherein: A filtering assembly is mounted in the fiber filter (3) for filtering.

7. The water treatment system for eel farming according to claim 6, wherein: The filtering assembly comprises at least one filtering disc (301), and the outer surface of each filtering disc (301) is wrapped with fiber filter cloth. At least one connecting rod (305) is arranged, one end of each connecting rod (305) is hinged with a fixed cantilever (302), and the other end of each connecting rod (305) is hinged with a suction box (303), the suction box (303) is arranged in one-to-one correspondence with the filtering disc (301), two adjacent suction boxes (303) are connected through springs (304), and the suction nozzle of each suction box (303) is pressed against the fiber filter cloth on the corresponding filtering disc (301) under the action of the spring (304).

8. The water treatment system for eel farming according to claim 1, wherein: Water outlets (16) and water inlets (15) are arranged on the side wall of the cyclone sedimentation tank (2) in a spaced manner from top to bottom, and the water inlet (15) enters the inside of the cyclone sedimentation tank (2) along the tangent of the side wall of the cyclone sedimentation tank (2).

9. The water treatment system for eel farming according to claim 8, wherein: A conical slope (11) is arranged on the inner side wall of the cyclone sedimentation tank (2) below the water inlet (15).

10. The water treatment system for eel farming according to claim 1, wherein: The water turning weir (12) is arranged obliquely, so that a water collecting groove (13) with decreasing width from top to bottom is formed between the water turning weir (12) and the inner side wall of the cyclone sedimentation tank (2), and the water collecting groove (13) is in communication with the water outlet pipe (16) correspondingly.

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