TOWER-SHAPE INTEGRATED ECOLOGICAL PURIFICATION DEVICE FOR DOMESTIC SEWAGE IN SMALL TOWN

Abstract

The present invention discloses a tower-shape integrated ecological purification device for domestic sewage in a small town. The device includes a water storage and filter pond, a medium reverse osmosis pond, an amphibious biological reaction system, and an aquatic biological reaction system. The amphibious biological reaction system and the aquatic biological reaction system are alternately connected from the top down. The amphibious biological reaction system and the aquatic biological reaction system form an alternating dry and wet, oxidation-reduction compound environment. Plant absorption, biological substrate transformation, aeration, and strengthening medium adsorption are combined to form a multi-stage plant-microbe-animal integrated ecological purification treatment process/device. The present invention achieves the efficient purification and acceptable discharge of domestic sewage in small towns.

Claims

1. A tower-shape integrated ecological purification device for domestic sewage in a small town, comprising a water storage and filter pond, an amphibious biological reaction system and an aquatic biological reaction system, wherein the amphibious biological reaction system and the aquatic biological reaction system are alternately connected from the top down; the amphibious biological reaction system comprises a reverse osmosis-amphibious plant reaction pond, an amphibious plant reaction pond, and an amphibious organism reaction pond in sequence from the top down; the aquatic biological reaction system comprises a reverse osmosis-aquatic plant reaction pond, an aquatic plant reaction pond, and an aquatic organism reaction pond in sequence from the top down.

2. The tower-shape integrated ecological purification device for domestic sewage in a small town according to claim 1, wherein the water storage and filter pond comprises a first water inlet and a first water outlet; the first water inlet and the first water outlet are respectively provided on two opposite sides of the water storage and filter pond; the first water inlet is 60 cm from the bottom of the pond, and the first water outlet is 50 cm from the bottom of the pond; the first water inlet is provided with a bamboo grill with a diameter of 3 cm, and the first water outlet is provided with a bamboo grill with a diameter of 0.5 cm.

3. The tower-shape integrated ecological purification device for domestic sewage in a small town according to claim 1, wherein the reverse osmosis-amphibious plant reaction pond comprises a first water outlet, a medium reverse osmosis pond, a filling layer, and a second water outlet; the first water outlet is 90 cm from the bottom of the pond; the medium reverse osmosis pond is provided at a water outlet end of the first water outlet; the filling layer comprises a sediment medium layer, amphibious plants and microorganisms; the second water outlet is 35 cm from the bottom of the reverse osmosis-amphibious plant reaction pond, and is slightly higher than the sediment medium layer.

4. The tower-shape integrated ecological purification device for domestic sewage in a small town according to claim 1, wherein the reverse osmosis-aquatic plant reaction pond comprises a second water outlet, a medium reverse osmosis pond, a filling layer, and a third water outlet; the second water outlet is 90 cm from the bottom of the reverse osmosis-aquatic plant reaction pond; the filling layer comprises a sediment medium layer, aquatic plants and microorganisms; the aquatic plants have high pollutant removal efficiency; the third water outlet is 75 cm from the bottom of the reverse osmosis-aquatic plant reaction pond.

5. The tower-shape integrated ecological purification device for domestic sewage in a small town according to claim 3, wherein a reverse osmosis port is provided at the bottom of a partition of the medium reverse osmosis pond; the medium reverse osmosis pond is sequentially provided with a medium layer, a filter layer, and a reverse filter layer from the top down; the medium layer is composed of montmorillonite (MTM-1) with a particle size of 0.01 mm to 0.03 mm and red purple weathered shale soil (HWR-1) with a particle size of 0.5 mm to 2.0 mm in sequence along a direction of a water flow; the filter layer is formed by laying pebbles with a particle size of 10 mm to 50 mm from small to large along the direction of the water flow, with a thickness of 10 cm to 20 cm; the reverse filter layer is formed by laying gravel and pebbles with a particle size of 10 mm to 50 mm from small to large along the direction of the water flow, with a thickness of 10 cm to 20 cm.

6. The tower-shape integrated ecological purification device for domestic sewage in a small town according to claim 4, wherein a reverse osmosis port is provided at the bottom of a partition of the medium reverse osmosis pond; the medium reverse osmosis pond is sequentially provided with a medium layer, a filter layer, and a reverse filter layer from the top down; the medium layer is composed of montmorillonite (MTM-1) with a particle size of 0.01 mm to 0.03 mm and red purple weathered shale soil (HWR-1) with a particle size of 0.5 mm to 2.0 mm in sequence along a direction of a water flow; the filter layer is formed by laying pebbles with a particle size of 10 mm to 50 mm from small to large along the direction of the water flow, with a thickness of 10 cm to 20 cm; the reverse filter layer is formed by laying gravel and pebbles with a particle size of 10 mm to 50 mm from small to large along the direction of the water flow, with a thickness of 10 cm to 20 cm.

7. The tower-shape integrated ecological purification device for domestic sewage in a small town according to claim 1, wherein the amphibious plant reaction pond comprises a third water outlet, a filling layer, and a fourth water outlet; the filling layer comprises a sediment medium layer, amphibious plants, microorganisms, and plankton; the amphibious plants are composed of tall and dwarf amphibious plants; the plankton comprises protozoa, algae and some crustaceans and mollusks.

8. The tower-shape integrated ecological purification device for domestic sewage in a small town according to claim 1, wherein the aquatic plant reaction pond comprises a fourth water outlet, a filling layer, and a fifth water outlet; the filling layer comprises a sediment medium layer, aquatic plants, microorganisms, and plankton.

9. The tower-shape integrated ecological purification device for domestic sewage in a small town according to claim 1, wherein the amphibious organism reaction pond comprises a fifth water outlet, a filling layer, and a sixth water outlet; the filling layer comprises a sediment medium layer, amphibious plants, microorganisms, plankton, and amphibious animals.

10. The tower-shape integrated ecological purification device for domestic sewage in a small town according to claim 1, wherein the aquatic organism reaction pond comprises a sixth water outlet, a filling layer, and a seventh water outlet; the filling layer comprises a sediment medium layer, aquatic plants, microorganisms, plankton, and aquatic animals.

11. The tower-shape integrated ecological purification device for domestic sewage in a small town according to claim 3, wherein the sediment medium layer is composed of coarse pebbles, fine pebbles, and fine sand with a gradually decreasing particle size from top to bottom; the coarse pebbles are 10 cm in thickness, the fine pebbles are 10 cm in thickness, and the fine sand is 5 cm in thickness.

12. The tower-shape integrated ecological purification device for domestic sewage in a small town according to claim 4, wherein the sediment medium layer is composed of coarse pebbles, fine pebbles, and fine sand with a gradually decreasing particle size from top to bottom; the coarse pebbles are 10 cm in thickness, the fine pebbles are 10 cm in thickness, and the fine sand is 5 cm in thickness.

13. The tower-shape integrated ecological purification device for domestic sewage in a small town according to claim 5, wherein the sediment medium layer is composed of coarse pebbles, fine pebbles, and fine sand with a gradually decreasing particle size from top to bottom; the coarse pebbles are 10 cm in thickness, the fine pebbles are 10 cm in thickness, and the fine sand is 5 cm in thickness.

14. The tower-shape integrated ecological purification device for domestic sewage in a small town according to claim 6, wherein the sediment medium layer is composed of coarse pebbles, fine pebbles, and fine sand with a gradually decreasing particle size from top to bottom; the coarse pebbles are 10 cm in thickness, the fine pebbles are 10 cm in thickness, and the fine sand is 5 cm in thickness.

15. The tower-shape integrated ecological purification device for domestic sewage in a small town according to claim 7, wherein the sediment medium layer is composed of coarse pebbles, fine pebbles, and fine sand with a gradually decreasing particle size from top to bottom; the coarse pebbles are 10 cm in thickness, the fine pebbles are 10 cm in thickness, and the fine sand is 5 cm in thickness.

16. The tower-shape integrated ecological purification device for domestic sewage in a small town according to claim 8, wherein the sediment medium layer is composed of coarse pebbles, fine pebbles, and fine sand with a gradually decreasing particle size from top to bottom; the coarse pebbles are 10 cm in thickness, the fine pebbles are 10 cm in thickness, and the fine sand is 5 cm in thickness.

17. The tower-shape integrated ecological purification device for domestic sewage in a small town according to claim 9, wherein the sediment medium layer is composed of coarse pebbles, fine pebbles, and fine sand with a gradually decreasing particle size from top to bottom; the coarse pebbles are 10 cm in thickness, the fine pebbles are 10 cm in thickness, and the fine sand is 5 cm in thickness.

18. The tower-shape integrated ecological purification device for domestic sewage in a small town according to claim 10, wherein the sediment medium layer is composed of coarse pebbles, fine pebbles, and fine sand with a gradually decreasing particle size from top to bottom; the coarse pebbles are 10 cm in thickness, the fine pebbles are 10 cm in thickness, and the fine sand is 5 cm in thickness.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Various embodiments are disclosed, by way of example only, with reference to the accompanying schematic drawings in which corresponding reference symbols indicate corresponding parts, in which:

[0025] FIG. 1 is a structural diagram of the present invention;

[0026] FIG. 2 is a structural diagram of an amphibious biological reaction system and an aquatic biological reaction system;

[0027] FIG. 3 is a structural diagram of a medium reverse osmosis pond according to the present invention; and,

[0028] FIG. 4 is a structural diagram of a water storage and filter pond according to the present invention.

DETAILED DESCRIPTION

[0029] The technical solutions in the examples of the present invention are clearly and completely described below with reference to the accompanying drawings in the examples of the present invention. Apparently, the described examples are merely a part rather than all of the examples of the present invention. All other examples obtained by a person of ordinary skill in the art based on the examples of the present invention without creative efforts should fall within the protection scope of the present invention.

Example

[0030] Referring to FIGS. 1-4, the present invention provides the following technical solution: a tower-shape integrated ecological purification device for domestic sewage in a small town. The device includes a water storage and filter pond 1, an amphibious biological reaction system and an aquatic biological reaction system. The amphibious biological reaction system and the aquatic biological reaction system are alternately connected from the top down. The amphibious biological reaction system includes a reverse osmosis-amphibious plant reaction pond 2, an amphibious plant reaction pond 4, and an amphibious organism reaction pond 6 in sequence from the top down. The aquatic biological reaction system includes a reverse osmosis-aquatic plant reaction pond 3, an aquatic plant reaction pond 5, and an aquatic organism reaction pond 7 in sequence from the top down.

[0031] The tower-shape integrated ecological purification device for domestic sewage in a small town uses an elevation difference to form an unpowered artesian channel. After domestic sewage is discharged and preliminarily filtered and precipitated, it flows in from a high place, and falls vertically into a medium reverse osmosis pond to form an aeration condition to oxidize and reduce pollutants, thus reducing biochemical oxygen demand (BOD) and chemical oxygen demand (COD). Then, the sewage infiltrates into the plant reaction pond through a reverse osmosis port at the bottom of the reverse osmosis pond by a pressure difference. The amphibious biological reaction system and the aquatic biological reaction system form an alternating dry and wet, oxidation-reduction compound environment. Under this environment, harmful and toxic substances in the domestic sewage are efficiently removed through a multi-stage ecological purification treatment process including plant absorption, microbial oxidation-reduction, and animal ingestion. The plants, animals, and microorganisms in the biological reaction system compose a self-purifying ecological system, which reduces the cost of maintaining sewage treatment.

[0032] In this example, specifically, the amphibious biological reaction system has a size of 60 cm deep×120 cm long×120 cm wide, and the aquatic biological reaction system has a size of 90 cm deep×120 cm long×120 cm wide. Medium reverse osmosis pond 8 is 30 cm away from a water inlet side, and a 5 cm high reverse osmosis port 81 is provided at the bottom of a partition. After the domestic sewage is discharged and preliminarily filtered and precipitated, it flows into the ecological purification system from a high place, and falls vertically into medium reverse osmosis pond 8 to form an aeration condition to oxidize and reduce pollutants, thus reducing BOD and COD. Then, the sewage infiltrates into the plant reaction pond through reverse osmosis port 81 at the bottom of the reverse osmosis pond by a pressure difference. Medium reverse osmosis pond 8 prolongs the residence time of the sewage and ensures that all sewage is treated by each reaction system.

[0033] In this example, specifically, water storage and filter pond 1 includes first water inlet 11 and first water outlet 12. First water inlet 11 and first water outlet 12 are respectively provided on two opposite sides of water storage and filter pond 1. First water inlet 11 is provided with a bamboo grill with a diameter of 3 cm, and first water outlet 12 is provided with a bamboo grill with a diameter of 0.5 cm. First water outlet 12 is slightly lower than first water inlet 11 to form a pressure difference.

[0034] In this example, specifically, reverse osmosis-amphibious plant reaction pond 2 includes first water outlet 12, medium reverse osmosis pond 8, filling layer 9, and second water outlet 21. First water outlet 12 is 90 cm from the bottom of the reverse osmosis-amphibious plant reaction pond. Medium reverse osmosis pond 8 is provided at a water outlet end of first water outlet 12. The medium reverse osmosis pond prolongs the residence time of the sewage and ensures that all sewage is treated by each reaction system. Filling layer 9 includes a sediment medium layer 91, amphibious plants, and microorganisms. Second water outlet 21 is 35 cm from the bottom of reverse osmosis-amphibious plant reaction pond 2, and is slightly higher than sediment medium layer 91. Sediment medium layer 91 includes coarse pebbles with a layer height of 10 cm and a particle size of about 10 cm, fine pebbles with a layer height of 10 cm and a particle size of about 5 cm, fine sand with a layer height of 5 cm and a particle size of about 1.5 cm, and gravel or tile/porcelain pieces in sequence along a direction of a water flow. The sediment medium layer further includes a gravel pile located in a center of the pond. The gravel pile forms an upper aerobic-lower anaerobic compound environment, and is provided with microbial strains for nitrogen (N) and phosphorus (P) removal. Reverse osmosis port 81 is provided at the bottom of the partition of medium reverse osmosis pond 8. The reverse osmosis pond is sequentially provided with medium layer 84, filter layer 83 and a reverse filter layer 82 from the top down. Medium layer 84 is composed of montmorillonite (MTM-1) with a particle size of 0.01 mm to 0.03 mm and red purple weathered shale soil (HWR-1) with a particle size of 0.5 mm to 2.0 mm in sequence along the direction of the water flow. Filter layer 83 is formed by laying pebbles with a particle size of 10 mm to 50 mm from small to large along the direction of the water flow, with a thickness of 10 cm to 20 cm. Reverse filter layer 82 is formed by laying gravel and pebbles with a particle size of 10 mm to 50 mm from small to large along the direction of the water flow, with a thickness of 10 cm to 20 cm. Tall plants (Ficus microphylla, Phyllostachys heteroclada) and dwarf plants (acorns calamus) are planted in the pond. The root systems of the Ficus microphylla and the acorns calamus are well-developed and resistant to erosion. The Phyllostachys heteroclada has high removal efficiency of carbon (C), N, and P pollutants in the sewage. The combination of tall and dwarf plants increases plant diversity and vegetation coverage, and increases pollutant absorption. The gravel, tile/ceramic pieces, and plant roots in the reaction pond attach microorganisms to form a biofilm, which improves the oxidation-reduction effect of microorganisms on pollutants. The plants have a well-developed root system with a strong ability to accumulate pollutants. The microorganisms are native strains for N and P removal. After the absorption by the amphibious plants and oxidation-reduction by the microorganisms in the reverse osmosis-amphibious plant reaction pond, the sewage falls into the reverse osmosis-aquatic plant reaction pond.

[0035] In this example, specifically, reverse osmosis-aquatic plant reaction pond 3 includes second water outlet 21, medium reverse osmosis pond 8, filling layer 9, and third water outlet 31. Second water outlet 21 is 90 cm from the bottom of the reverse osmosis-aquatic plant reaction pond. Filling layer 9 includes sediment medium layer 91, aquatic plants (Dichondra micrantha) and microorganisms. The aquatic plants have high pollutant removal efficiency. Third water outlet 31 is 75 cm from the bottom of the reverse osmosis-aquatic plant reaction pond. In this way, a waterlogged anaerobic environment is formed for microbial anaerobic reaction. The C, N, and P pollutants are further reduced through medium adsorption, Dichondra micrantha absorption, and microbial anaerobic oxidation. After the adsorption by the medium at the bottom of the pond and absorption by the aquatic plants, the sewage falls into the amphibious plant reaction pond.

[0036] In this example, specifically, amphibious plant reaction pond 4 includes third water outlet 31, filling layer 9, and fourth water outlet 41. Filling layer 9 includes sediment medium layer 91, amphibious plants, microorganisms, and plankton. The amphibious plants are composed of tall and dwarf amphibious plants. The plankton includes protozoa, algae, and some crustaceans and mollusks. The amphibious plants include tall plants having a well-developed root system with a strong ability to accumulate pollutants and dwarf plants having a well-developed root system to resist erosion. The combination of tall and dwarf plants increases plant diversity and vegetation coverage, and increases pollutant absorption. The microorganisms form a biofilm by the well-developed root system of the plants. After the absorption by the amphibious plants, oxidation-reduction by the microorganisms and ingestion by the plankton in the pond, the sewage falls into the aquatic plant reaction pond.

[0037] In this example, specifically, aquatic plant reaction pond 5 includes fourth water outlet 41, filling layer 9, and fifth water outlet 51. Filling layer 9 includes sediment medium layer 91, aquatic plants, microorganisms, and plankton. Sediment medium layer 91 adsorbs some organic matter and suspended matter. The gravel and tile/ceramic pieces are scattered in the pond to attach microorganisms to form a biofilm. After the anaerobic oxidation-reduction by the microorganisms, absorption by the aquatic plants, plankton ingestion and adsorption by the medium, the sewage falls into the amphibious organism reaction pond.

[0038] In this example, specifically, amphibious organism reaction pond 6 includes fifth water outlet 51, filling layer 9, and sixth water outlet 61. Filling layer 9 includes sediment medium layer 91, amphibious plants, microorganisms, plankton, and amphibious animals. The plankton includes protozoa, algae and some crustaceans and mollusks. The plankton directly ingests pollutants, microorganisms and plant secretions, sloughs, etc., so as to clean the environment of the reaction pond. The amphibious animals can accumulate pollutants, so as to improve the permeability of sediment medium layer 91, promote the absorption of pollutants by plant roots, and prevent the water outlet from being blocked. In addition to the absorption plants, the oxidation-reduction microorganisms and the ingestion plankton, the amphibious animals further enrich the food chains, and improve sewage treatment efficiency and the self-purification function of the reaction pond.

[0039] In this example, specifically, aquatic organism reaction pond 7 includes sixth water outlet 61, filling layer 9, and seventh water outlet 71. Filling layer 9 includes sediment medium layer 91, aquatic plants, microorganisms, plankton, and aquatic animals. The aquatic animals are mollusks. Pollutants are further reduced through biological assimilation, microbial denitrification, and predation of aquatic animals.

[0040] In the above example, sediment medium layer 91 is composed of coarse pebbles, fine pebbles, and fine sand with a gradually decreasing particle size from top to bottom. The coarse pebbles are 10 cm in thickness, the fine pebbles are 10 cm in thickness, and the fine sand is 5 cm in thickness. Sediment medium layer 91 further includes a gravel pile located in a center of the pond. The gravel pile is composed of gravel or tile/ceramic pieces. The gravel pile attaches microorganisms, and grows plants on an upper part thereof.

[0041] Specifically, sediment medium layer 91 is sequentially composed of coarse pebbles with a height of 10 cm and a diameter of about 10 cm, fine pebbles with a height of 10 cm and a diameter of 5 cm, fine sand with a height of 3 cm and a diameter of 1.5 cm, fly ash with a height of 2 cm and a diameter of 1 cm, and gravel or tile/ceramic pieces with a diameter of 3 cm. The gravel pile is composed of gravel with a diameter of greater than 10 cm.

[0042] The microorganisms are native strains for N and P removal. The amphibious plants include tall plants having a well-developed root system with a strong ability to accumulate pollutants and dwarf plants having a well-developed root system to resist erosion. The aquatic plants have high pollutant removal efficiency. The plankton includes protozoa, algae, and some crustaceans and mollusks. The animals are small amphibious or aquatic animals that can accumulate pollutants. For example, earthworms can be raised in the pond to break and decompose coarse organic matter. They can improve the permeability of the sediment medium, promote the absorption of pollutants by plant roots, prevent blockage of the water outlet, enhance microbial oxidation (nitrification), and improve the removal rate of ammonia nitrogen. The aquatic animals can also be loaches. The C, N, and P pollutants are further reduced through the biological assimilation of Dichondra micrantha, microbial denitrification and predation of aquatic animals.

[0043] Working Principle: In operation, the domestic sewage is preliminarily filtered and precipitated by water storage and filter pond 1, and then first falls into reverse osmosis-amphibious plant reaction pond 2. A falling aeration condition is formed to oxidize and reduce pollutants, thus reducing BOD and COD. Then, the sewage infiltrates into amphibious plant reaction pond 4 through reverse osmosis port 81 at the bottom of medium reverse osmosis pond 8 by a pressure difference. In the amphibious plant reaction pond, an amphibious environment is formed with stones, and amphibious plants are planted. The sewage is absorbed by the amphibious plants and oxidized and reduced by the microorganisms in the pond, and then falls into reverse osmosis-aquatic plant reaction pond 3. After a short aeration in the reverse osmosis pond, the sewage enters aquatic plant reaction pond 5 through reverse osmosis port 81. After being absorbed by the medium at the bottom of the aquatic plant reaction pond and absorbed by the aquatic plants, the sewage falls into amphibious plant reaction pond 4. The microorganisms form a biofilm by the developed roots of plants. After the absorption by the amphibious plants, oxidation-reduction by the microorganisms and ingestion by the plankton in the pond, the sewage enters aquatic plant reaction pond 5. The sewage is subjected to microbial anaerobic oxidation-reduction, aquatic plant absorption, plankton ingestion, and medium adsorption in the pond, and then falls into amphibious organism reaction pond 6 and aquatic organism reaction pond 7. In amphibious organism reaction pond 6, in addition to the absorption plants, the oxidation-reduction microorganisms and ingestion plankton, amphibious and aquatic animals are added to enrich the food chains. In the alternating dry and wet, oxidation-reduction compound environment composed of the amphibious environment and aquatic environment, the gradually enhanced multi-stage ecological purification treatment process including plant absorption, microbial oxidation-reduction, and animal ingestion, the harmful and toxic substances in the domestic sewage are efficiently removed. The plants, aquatic animals, and microorganisms in the reaction ponds constitute a self-purifying ecological system, which reduces the cost of maintaining sewage treatment.

[0044] Although the examples of the present invention have been illustrated, it should be understood that those of ordinary skill in the art may make various changes, modifications, replacements, and transformations to the above examples without departing from the principle and spirit of the present invention, and the scope of the present invention is limited by the appended claims and their legal equivalents.

LIST OF REFERENCE NUMERALS

[0045] 1 Water storage and filter pond [0046] 2 Reverse osmosis-amphibious plant reaction pond [0047] 3 Reverse osmosis-aquatic plant reaction pond [0048] 4 Amphibious plant reaction pond [0049] 5 Aquatic plant reaction pond [0050] 6 Amphibious organism reaction pond [0051] 7 Aquatic organism reaction pond [0052] 8 Medium reverse osmosis pond [0053] 9 Filling layer [0054] 11 First water inlet [0055] 12 First water outlet [0056] 21 Second water outlet [0057] 31 Third water outlet [0058] 41 Fourth water outlet [0059] 51 Fifth water outlet [0060] 61 Sixth water outlet [0061] 71 Seventh outlet [0062] 81 Reverse osmosis port [0063] 82 Reverse filter layer [0064] 83 Filter layer [0065] 84 Medium layer [0066] 91 Sediment medium layer