Urechis unicinctus sand filter

Abstract

The utility model discloses a urechis unicinctus sand filter, and belongs to the technical field of aquaculture tail water treatment. The sand filter comprises a sand filter body, a hollow overflow layer and an outer protective layer, the sand filter body is divided into three layers, namely a fine sand layer, a coarse sand layer and a cobblestone layer, through a urechis unicinctus culture box supporting sieve plate, a coarse sand screen and a cobblestone screen. And the fine sand layer is divided into four fan-shaped sea worm breeding boxes, the side surfaces and the bottoms of the box bodies are permeable screen-shaped, and arc-shaped protective plates are arranged on top plates of the box bodies, are folded at the upper edge of the sand filter body and are used for overflow drainage. And the sand filter is used for filtering large particles in the aquaculture tail water by absorbing residual bait and excrement in the aquaculture tail water by using the sea intestines and filtering the large particles in the aquaculture tail water by using fine sand. The device organically integrates machinery, microorganisms and organisms to purify the culture tail water, is time-saving and labor-saving, is suitable for filtering natural seawater or factory-like and pond seedling culture and culture tail water, and is wide in application range; the utilization rate and the output rate of unit seawater resources are improved, and waste of water resources is avoided.

Description

Technical Field

[0001] The utility model relates to a single-ringed sea cucumber (sea intestine) sand filter, which belongs to the technical field of aquaculture tail water treatment. It is mainly aimed at the primary treatment of the tail water of industrialized seawater aquaculture and the reuse of residual bait and feces in the aquaculture tail water, and is applied to the industrialized and pond seedling raising and aquaculture industries of seawater economic organisms, and can also be applied to the seawater desalination industry or large-scale seawater aquarium industry. Background Art

[0002] The industrialized and large-scale aquaculture production mode is one of the major development directions at present. The large amount of seawater used in land-based industrialized aquaculture has caused problems such as water eutrophication that need to be solved urgently. Under the production mode of industrialized and intensive aquaculture, the feed residues in high-density seawater aquaculture will cause the content of nutrients such as organic matter, N, and P in the water body to be too high. Moreover, the industrialization degree of domestic aquaculture technology is not high. If the aquaculture tail water is discharged wantonly, it will exacerbate the water eutrophication in the coastal waters and is extremely likely to cause seawater environmental pollution.

[0003] At present, China's water purification technology mainly relies on physical (sedimentation, filtration, foam separation), chemical (oxidation-reduction, flocculation), and biological (biotransformation, biodegradation) methods to purify aquaculture water bodies to meet the requirements of industrialized aquaculture water bodies. However, in land-based industrialized aquaculture workshops, the current water treatment technologies still have various problems. For example, the use of chemical agents is likely to cause secondary pollution to aquaculture water bodies; physical filtration has an unsatisfactory removal effect on soluble organic matter, inorganic matter, total nitrogen, and total phosphorus; although biological treatment has the characteristics of ecology and safety, the treatment cycle is long and the effect is slow. For new water treatment technologies, such as membrane technology, ozone oxidation, and improvement of biological filter media, the economic cost is often high and the water filtration effect is also biased. Membrane technology has a high cost, a short service life, is easily contaminated and fouled and blocked; ozone oxidation method has a high cost, an expensive treatment cost, and has selectivity, and has a poor oxidation effect on certain halogenated hydrocarbons and pesticides, etc.; in the improvement of biological filter media, the cost is high and the utilization rate is low.

[0004] That is, in industrialized seawater aquaculture, seawater aquaculture will produce bait residues and feces, which will pollute the water body. At present, the related technologies use mechanical, physical, biological, chemical and other means to treat aquaculture tail water, and it is difficult to achieve the required effect or the cost of achieving the corresponding result is too high. Therefore, how to treat the seawater aquaculture tail water rich in nutrients such as organic matter, N, and P in the water body at low cost and high return, or how to utilize it during the treatment process is the technical problem to be solved in this application. Summary of the Invention

[0005] To solve the problems existing in the prior art, the present utility model provides a Urechis unicinctus (sea intestine) sand filter, which raises Urechis unicinctus in the sand filter for pre-treating the aquaculture tail water. By virtue of the strong adaptability of Urechis unicinctus to the marine environment and its property of improving water quality, the situation that Urechis unicinctus gets ill during the breeding process is not likely to occur; meanwhile, the breeding of Urechis unicinctus also has a certain water-permeable effect, increasing the water permeability of the sand filter and avoiding the problem that the existing sand filter needs to be hermetically pressurized due to poor water permeability; finally, raising Urechis unicinctus in the sand filter can well absorb and utilize the organic substances, nutrients such as N and P in the aquaculture tail water of seawater, avoiding the problem of water eutrophication caused by the direct discharge of the tail water; and realizing the treatment of the aquaculture tail water with low cost and high return.

[0006] To solve the above technical problems, the technical solution provided by the present utility model is as follows:

[0007] A Urechis unicinctus sand filter, the bottom of the sand filter is supported by legs, a water inlet pipe is arranged at the top, and a sand filter body is arranged inside. A hollow overflow layer and an outer protective layer are successively arranged on the outer side of the sand filter body, and a tank body protective cover is arranged above the outer protective layer; an overflow siphon is arranged at the bottom of the hollow overflow layer, and the highest point of the overflow siphon is lower than the upper edge of the sand filter body; load-bearing columns are arranged between adjacent two layers of the sand filter body, the hollow overflow layer and the outer protective layer.

[0008] The inside of the sand filter body is divided into three layers by a sea intestine breeding box support screen plate, a coarse sand screen and a cobblestone screen, which are a fine sand layer, a coarse sand layer and a cobblestone layer respectively; a water collection cavity is formed between the lower side of the cobblestone screen and the bottom of the sand filter body, load-bearing columns are arranged in the water collection cavity, and the two ends of the load-bearing columns are respectively connected to the cobblestone screen and the sand filter body; a rhombic fixing column is arranged at the center above the cobblestone screen, and the rhombic fixing column successively passes through the coarse sand screen, the coarse sand layer and the sea intestine breeding box support screen plate and extends to the fine sand layer; one end of a hole-shaped drain pipe is connected to the center below the cobblestone screen, and the other end of the drain pipe successively passes through the sand filter body, the hollow overflow layer and the outer protective layer to be provided with a water outlet, and drain holes are arranged on the part of the hole-shaped drain pipe placed in the water collection cavity.

[0009] The fine sand layer is provided with a plurality of sector-shaped sea intestine breeding boxes centered on the rhombic fixing column, the sector-shaped sea intestine breeding boxes are of a sector structure composed of arc-shaped plates, prism flat plates and screen partitions, and the bottom of the sector-shaped sea intestine breeding boxes is provided with a bottom screen plate; arc-shaped protection plates are arranged on the arc-shaped plates and are folded to the upper edge of the sand filter body.

[0010] The tank body protective cover is provided with a protective cover ventilation opening.

[0011] A water distributor is arranged at the bottom of the water inlet pipe, and the water distributor is suspended above the fine sand layer.

[0012] The outlet of the overflow siphon is connected to the sewage collection tank, and the outlet position of the overflow siphon is set at the 2 / 3 height position of the pool wall.

[0013] The outlet of the overflow siphon is connected to the water inlet pipe of the next sand filter tank for series connection of multiple sand filter tanks; the outlet of the overflow siphon of the last-stage sand filter tank is connected to the sewage collection tank, and the outlet position of the overflow siphon is set at the 2 / 3 height position of the pool wall.

[0014] A sewage collection tank partition is arranged in the sewage collection tank. The distance from the sewage collection tank partition to the pool wall connecting the outlet of the overflow siphon is 2 / 3 of the bottom length of the tank; the height of the sewage collection tank partition is 2 / 3 of the pool wall height.

[0015] An alarm controller for monitoring the water level and giving an alarm is arranged on the overflow siphon.

[0016] Lifting lugs for hoisting are arranged on the arc-shaped guard plate.

[0017] The sand filter tank consists of a water inlet and a water distribution device; the upper layer sea intestine culture box is configured with a fine sand layer suitable for the survival of Urechis unicinctus and a bottom screen, the middle layer partition is configured with a coarse sand layer and a bottom screen, and the lower layer partition is configured with a cobblestone layer and a bottom screen. In view of the bearing problem of the inner sea intestine culture box, 6-8 support columns are designed at the bottom to fix and support the inner sea intestine culture box. A solid bottom structure is adopted at the bottom and a water outlet pipe is reserved. After the hydraulic load of the inner sea intestine culture box is overloaded, it overflows to the middle layer overflow space from the upper layer space. 6-8 support columns are also installed at the bottom of the middle layer overflow space to fix and support the inner sea intestine culture box. A drainage pipe and an overflow siphon are arranged at the bottom of the middle layer overflow space, and a small sensor is designed on the overflow siphon to sense the sewage discharge situation in the overflow space. The outer layer space is a protective layer designed to protect the inner sea intestine culture box from external natural factors. The present invention can be connected in parallel or in series to form a biological treatment project for treating seawater aquaculture tail water.

[0018] The water inlet is connected to the water distribution device, which adopts a porous water distribution method so that the hydraulic flow rate will not cause the loss of fine sand; the aquaculture tail water flows into the upper sea intestine culture box from the water distribution device, and the monocyclic spiny worms absorb the bait residues and feces in the aquaculture tail water, and the fine sand physically filters the harmful factors in the aquaculture tail water; a screen device is set at the bottom, and the screen mesh is smaller than the size of the fine sand particles to prevent the loss of fine sand and filter the aquaculture tail water; the aquaculture tail water flows into the coarse sand layer after being filtered and absorbed by the sea intestine in the upper sea intestine culture box, and a screen device is set at the bottom. Screen; the aquaculture tail water flows into the pebble layer after being filtered through the coarse sand layer, and a screen is set at the bottom of the pebble layer; 6-8 support columns are set at the bottom of the screen of the pebble layer to fix and support the inner layer of sea intestine aquaculture box; the aquaculture tail water flows into the water outlet at the bottom of the sea intestine aquaculture box through the pebble layer, and the water outlet is connected to the middle overflow space to the bottom of the outer protective layer; when the hydraulic load of the inner sea intestine aquaculture box space is overloaded, the aquaculture tail water overflows from the upper layer to the middle overflow space; 6-8 support columns are set at the bottom of the overflow space to fix and support the inner layer of sea intestine aquaculture box;

[0019] An overflow siphon is arranged at the bottom of the overflow space, and a small sensor switch is installed on the overflow siphon; 6-8 support columns are arranged at the bottom of the outer space to fix and support the inner sea intestine culture box; a water outlet is designed at the bottom of the outer space to discharge the aquaculture tail water from the water outlet.

[0020] The materials used for this device include but are not limited to PVC, concrete, fiberglass, titanium alloy, and reinforced concrete.

[0021] The advantages of the utility model compared with the prior art are:

[0022] The beneficial effects of the utility model are as follows: the sand filter tank includes a sand filter tank body, a hollow overflow layer and an outer protective layer. The sand filter tank body is divided into three layers through the sea intestine breeding box support screen plate, the coarse sand screen and the pebble screen, which are respectively a fine sand layer, a coarse sand layer and a pebble layer. The fine sand layer is divided into 4 fan-shaped sea intestine breeding boxes, and the sides and bottom of the fan-shaped sea intestine breeding boxes are all permeable screens; the top plate of the fan-shaped sea intestine breeding box is provided with an arc-shaped guard plate, which is folded at the upper edge of the sand filter tank body for overflow drainage. The aquaculture tail water is subjected to primary treatment through the sand filter tank, and the bait residue in the aquaculture tail water is absorbed by the sea intestine itself, and the large particles in the aquaculture tail water are filtered by fine sand; it is intended to realize the purification of water bodies by utilizing biological absorption, physical filtration, microbial biochemical reactions and other aspects, and enable it to effectively use water resources multiple times to avoid waste of water resources.

[0023] It has a certain effect on removing bait residues and harmful factors in the tail water of marine aquaculture. In addition, it increases the output of aquaculture species in the process of marine aquaculture, aiming to provide a more environmentally friendly, effective and ecologically friendly technical link for the marine aquaculture industry.

[0024] In view of the current technical means adopted in water treatment technology and the ecological habits of Urechis unicinctus, the utility model combines the reasonable matching of technologies in aspects such as aquatic organisms, physics, and machinery. On the basis of the water quality treatment mechanism, it utilizes the role of Urechis unicinctus itself in improving water quality to treat the aquaculture tail water.

[0025] The sand filter tank aims to filter natural seawater or the tail water of industrialized and pond seedling rearing and aquaculture, improve the utilization rate and output rate of unit seawater resources, achieve the efficient, energy-saving, environmental protection, and ecological utilization of seawater resources, and make corresponding contributions to the aquaculture profession.

[0026] Organically combine the technologies in three different fields of machinery, microorganisms, and biology to achieve the purification treatment of aquaculture tail water. It is relatively time-saving and labor-saving, applicable to filtering natural seawater or the tail water of industrialized and pond seedling rearing and aquaculture, with a wide range of applications; it improves the utilization rate and output rate of unit seawater resources, achieves the efficient, energy-saving, environmental protection, and ecological utilization of seawater resources, and avoids the waste of water resources. Brief Description of the Drawings

[0027] Figure 1 It is a structural diagram of a Urechis unicinctus sand filter tank.

[0028] Figure 2 It is a cross-sectional view of a Urechis unicinctus sand filter tank.

[0029] Figure 3 It is Figure 2 The cross-sectional view of A - A in

[0030] Figure 4 It is a working schematic diagram of a Urechis unicinctus sand filter tank.

[0031] In the figure: 1, water inlet pipe, 1a, water distributor, 2, tank body protective cover, 2a, protective cover ventilation opening, 3, fine sand layer, 3a, fan-shaped sea intestine breeding box, 3b, arc plate, 3c, screen partition board, 3d, prism flat plate, 3e, arc protection plate, 3f, bottom screen, 3g, lifting lug, 4, breeding box support screen plate, 5, coarse sand layer, 6, coarse sand screen, 7, cobblestone layer, 8, cobblestone screen, 9, water collection cavity, 10, perforated drain pipe, 10a, drain hole, 11, hollow overflow layer, 12, overflow siphon, 13, outer protective layer, 14, load-bearing support, 15, water outlet, 16, alarm controller, 17, support leg, 18, sand filter tank body, 19, sewage collection tank, 19a, sewage collection tank partition board, 19b, pool wall, 19c, pool bottom, 20, rhombus fixing column. Detailed Embodiment

[0032] Embodiments of the present utility model will be described in detail below. Examples of the embodiments are shown in the accompanying drawings, where the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the accompanying drawings are exemplary and are only used to explain the present utility model and should not be construed as a limitation to the present utility model.

[0033] Figures 1 to 3 A single-ringed Urechis unicinctus sand filter is shown. The bottom of the sand filter is supported by legs 17, the top is provided with a water inlet pipe 1, and a sand filter body 18 is arranged inside. It is characterized in that: a hollow overflow layer 11 and an outer protective layer 13 are successively arranged on the outer side of the sand filter body 18, and a tank body protective cover 2 is arranged above the outer protective layer 13; an overflow siphon 12 is arranged at the bottom of the hollow overflow layer 11, and the highest point of the overflow siphon 12 is lower than the top of the sand filter body 18; load-bearing pillars 14 are arranged between adjacent two layers of the sand filter body 18, the hollow overflow layer 11 and the outer protective layer 13.

[0034] Inside the sand filter body 18, it is divided into three layers by a sea intestine breeding box support sieve plate 4, a coarse sand sieve mesh 6 and a cobblestone sieve mesh 8, which are a fine sand layer 3, a coarse sand layer 5 and a cobblestone layer 7 respectively; a water collection cavity 9 is formed between the lower side of the cobblestone sieve mesh 8 and the bottom of the sand filter body 18, and a load-bearing pillar 14 is arranged in the water collection cavity 9, and its two ends are respectively connected to the cobblestone sieve mesh 8 and the sand filter body 18; a rhombic fixing column 20 is arranged at the center above the cobblestone sieve mesh 8, and the rhombic fixing column 20 successively passes through the coarse sand sieve mesh 6, the coarse sand layer 5 and the sea intestine breeding box support sieve plate 4 and extends to the fine sand layer 3; one end of a hole-shaped drain pipe 10 is connected to the center below the cobblestone sieve mesh 8, and the other end of the drain pipe 10 successively passes through the sand filter body 18, the hollow overflow layer 11 and the outer protective layer 13 to set an outlet 15, and a drain hole 10a is arranged at the part of the hole-shaped drain pipe 10 placed in the water collection cavity 9.

[0035] Four fan-shaped sea intestine breeding boxes 3a are arranged in the fine sand layer 3 with the rhombic fixing column 20 as the center. The fan-shaped sea intestine breeding boxes 3a are composed of an arc-shaped plate 3b, a prism flat plate 3d and a sieve mesh partition 3c to form a fan-shaped structure. The bottom of the fan-shaped sea intestine breeding boxes 3a is provided with a bottom sieve plate 3f; an arc-shaped protection plate 3e that is folded onto the sand filter body 18 is arranged on the arc-shaped plate 3b.

[0036] The tank body protective cover 2 is provided with a protective cover ventilation opening 2a for sea intestine breeding ventilation. A water distributor 1a is arranged at the bottom of the water inlet pipe 1, and the water distributor 1a is suspended above the fine sand layer 3. The outlet of the overflow siphon 12 is connected to a sewage collection tank 19, and the outlet position of the overflow siphon 12 is set at the 2 / 3 height position of the pool wall 19b. Or the outlet of the overflow siphon 12 is connected to the water inlet pipe of the next sand filter for series connection of multiple sand filters; the outlet of the overflow siphon 12 of the last-stage sand filter is connected to the sewage collection tank 19, and the outlet position of the overflow siphon 12 is set at the 2 / 3 height position of the pool wall 19b.

[0037] A sewage collection tank partition 19a is arranged in the sewage collection tank 19. The distance from the sewage collection tank partition 19a to the pool wall 19b connecting the outlet of the overflow siphon 12 is 2 / 3 of the length of the pool bottom 19c; the height of the sewage collection tank partition 19a is 2 / 3 of the height of the pool wall 19b. An alarm controller 16 for monitoring the water level and giving an alarm is arranged on the overflow siphon 12. A lifting lug 3g for hoisting is arranged on the arc-shaped guard plate 3e.

[0038] When working with the above technical solution, first, the aquaculture wastewater flows into the sand filtration tank body 18 through the water inlet 1. To ensure the light intensity required for the survival of Urechis unicinctus in the internal sea cucumber aquaculture tank of the tank body, and for the biochemical reaction of the aquaculture tail water through air contact, a ventilation device for the tank body protective cover 2 is designed; the sand filtration tank body 18 is divided into upper, middle and lower layers. The fine sand layer 3 is the sandy mud bottom for culturing Urechis unicinctus. A rhombic fixing column 20 is arranged in the center of the pool, and with the column as the center, the fine sand layer 3 is divided into four equal-sector fan-shaped Urechis unicinctus aquaculture tanks 3a. Each arc-shaped plate 3b of the fan-shaped structure is solid, the cross-section sieve plate partition 3c and the bottom sieve plate 3f at the bottom are of mesh structure, and the prism plane 3d acts with the rhombic fixing column 20. The main purpose of the bottom sieve plate 3f is to ensure that the fine sand does not flow away with the water flow; a Urechis unicinctus aquaculture tank support sieve plate 4 is arranged at the bottom of the bottom sieve plate 3f for supporting the fan-shaped Urechis unicinctus aquaculture tank 3a. The aquaculture tail water penetrates into the coarse sand layer 5 through the bottom sieve plate 3f and the Urechis unicinctus aquaculture tank support sieve plate 4. To ensure the prevention of the loss of coarse sand under the action of gravity, a coarse sand sieve mesh 6 is arranged at the bottom layer of the coarse sand layer 5. The aquaculture tail water continues to flow down into the cobblestone layer 7, and a cobblestone sieve mesh 8 is also arranged at the bottom to prevent the cobblestones from falling. Finally, the aquaculture tail water enters the water collection cavity 9. By providing a contact air buffer space for the aquaculture tail water in the water collection cavity 9, the water collection cavity 9 is connected to the porous drain pipe 10, facilitating the discharge of the aquaculture tail water after being filtered layer by layer. Prevent the loss of fine sand.

[0039] When the hydraulic load of the sand filtration tank body 18 is overloaded, the aquaculture tail water will overflow to the middle layer overflow space. An overflow siphon 12 is arranged on the right side of the drainage pipe at the bottom of the middle layer overflow space. The overflow aquaculture tail water is drained by the overflow siphon 12 to the next sand filtration tank or the sewage collection tank 19.

[0040] The outside of the sand filtration tank is an outer protective layer 13, which plays a protective role for the internal hollow overflow layer 11 and the structure of the sand filtration tank body 18. Load-bearing support columns 14 are arranged at the bottoms of the cobblestone sieve mesh 9, the sand filtration tank body 18, and the hollow overflow layer 11 to ensure that during the entire process of purifying water quality, the weight of the sand and stone structure and the aquaculture tail water can be supported.

[0041] An outlet 15 is arranged at the bottom of the sand filtration tank. The length of the outlet pipe penetrates through the hollow overflow layer 11 and the outer protective layer 13 and is connected to the porous drain pipe.

[0042] The above description is made on the present utility model and its implementation manners. Such description is not restrictive. What is shown in the drawings is only one of the implementation manners of the present utility model, and the actual structure is not limited thereto. Generally speaking, if those of ordinary skill in the art are inspired by it and design, without creative efforts, structural modes and embodiments similar to the technical solution without departing from the purpose of the creation of the present utility model, they shall fall within the protection scope of the present utility model.

Claims

1. A single-ring spiny worm sand filter, the bottom of the sand filter is supported by legs (17), a water inlet pipe (1) is arranged on the top, and a sand filter body (18) is arranged inside, characterized in that: The outer side of the sand filter body (18) is provided with a hollow overflow layer (11) and an outer protective layer (13) in sequence, and a tank protection cover (2) is provided above the outer protective layer (13); an overflow siphon (12) is provided at the bottom of the hollow overflow layer (11), and the highest point of the overflow siphon (12) is lower than the upper edge of the sand filter body (18); and load-bearing pillars (14) are provided between two adjacent layers of the sand filter body (18), the hollow overflow layer (11) and the outer protective layer (13); The sand filter tank body (18) is divided into three layers by the sea intestine culture box support screen plate (4), the coarse sand screen (6) and the pebble screen (8), namely the fine sand layer (3), the coarse sand layer (5) and the pebble layer (7); The lower side of the pebble screen (8) and the bottom of the sand filter tank body (18) form a water collecting chamber (9), and a load-bearing support (14) is arranged in the water collecting chamber (9), and the two ends of the support are respectively connected to the pebble screen (8) and the sand filter tank body (18); A prismatic fixing column (20) is arranged at the center of the upper part of the pebble screen (8), and the prismatic fixing column (20) sequentially passes through the coarse sand screen (6), the coarse sand layer (5) and the sea cucumber culture box support screen plate (4) to extend to the fine sand layer (3); one end of a porous drainage pipe (10) is connected to the center of the lower part of the pebble screen (8), and the other end of the drainage pipe (10) sequentially passes through the sand filter tank body (18), the hollow overflow layer (11) and the outer protective layer (13) to be provided with a water outlet (15), and a drainage hole (10a) is arranged at the part of the porous drainage pipe (10) placed in the water collecting chamber (9); The fine sand layer (3) adopts a plurality of fan-shaped sea intestine culture boxes (3a) arranged with a prismatic fixed column (20) as the center. The fan-shaped sea intestine culture box (3a) adopts an arc plate (3b), a prismatic flat plate (3d) and a screen partition (3c) to form a fan-shaped structure. A bottom screen plate (3f) is arranged at the bottom of the fan-shaped sea intestine culture box (3a); and an arc-shaped protective plate (3e) folded to the upper edge of the sand filter tank body (18) is arranged on the arc plate (3b).

2. A single-ring spiny worm sand filter according to claim 1, characterized in that: The tank body protective cover (2) is provided with a protective cover vent (2a).

3. The single-ring sphagnum sand filter according to claim 1, characterized in that: A water distributor (1a) is provided at the bottom of the water inlet pipe (1), and the water distributor (1a) is suspended above the fine sand layer (3).

4. The single-ring spiny worm sand filter according to claim 1, characterized in that: The outlet of the overflow siphon pipe (12) is connected to the sewage collecting tank (19), and the outlet position of the overflow siphon pipe (12) is arranged at a height position of 2 / 3 of the tank wall (19b).

5. The single-ring spiny worm sand filter according to claim 1, characterized in that: The outlet of the overflow siphon pipe (12) is connected to the water inlet pipe of the next sand filter tank, so that multiple sand filters are connected in series; the outlet of the overflow siphon pipe (12) of the last sand filter tank is connected to the sewage collection tank (19), and the outlet position of the overflow siphon pipe (12) is set at a height of 2 / 3 of the tank wall (19b).

6. A single-ring spiny worm sand filter according to claim 4 or 5, characterized in that: A sewage collecting pool partition (19a) is provided in the sewage collecting pool (19); the distance between the sewage collecting pool partition (19a) and the pool wall (19b) connected to the outlet of the overflow siphon pipe (12) is 2 / 3 of the length of the pool bottom (19c); and the height of the sewage collecting pool partition (19a) is 2 / 3 of the height of the pool wall (19b).

7. The single-ring spiny worm sand filter according to claim 1, characterized in that: The overflow siphon (12) is provided with an alarm controller (16) for monitoring the water level and issuing an alarm.

8. The single-ring spiny worm sand filter according to claim 1, characterized in that: The arc-shaped guard plate (3e) is provided with a lifting lug (3g) for lifting.

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