Discharge opening biological filter system

Abstract

The invention relates to a discharge port biological filter system which comprises an inner ring gabion, the area of the inner ring gabion is determined according to the average daily displacement of a discharge port and the hydraulic retention time of 4 hours; the outer ring overflow weir adopts a triangular overflow weir, graded broken stones are filled in the outer ring overflow weir, and sandy soil is selected for 30cm of the surface layer; the biological matrix is located in the inner ring gabion, the biological matrix comprises volcanic rock, paddy basketry rock and biological ceramsite, and the porosity of the biological matrix is larger than or equal to 40%; the hygrophytes are emergent aquatic plants, and varieties with stain resistance and developed root systems are selected. According to the discharge port biological filter system provided by the invention, through the inner ring gabion and the outer ring overflow weir, the tail end treatment of the rain and sewage mixed discharge port is realized, and the quality of water entering a lake is greatly improved.

Description

Technical Field

[0001] The present invention relates to the technical field of ecological water treatment, and particularly to an outfall biological filter system. Background Art

[0002] With the development of cities, the water pollution of lakes has intensified, hindering the progress of human society.

[0003] The utility model patent with the publication number CN206655187U and the name of "Vegetation-type gabion for ecological restoration" discloses a vegetation-type gabion for ecological restoration, including a gabion (1). In the gabion (1), a crushed stone filling layer (2) is arranged from the outer layer to the inner layer in sequence. A plant growth matrix layer (3) is arranged inside the crushed stone filling layer (2), and the plant growth matrix layer (3) is wrapped by an erosion-proof geotextile (4). However, this vegetation-type gabion is too simple to effectively filter sewage.

[0004] Therefore, it is necessary to provide an outfall biological filter system to solve the above problems. Summary of the Invention

[0005] The purpose of the present invention is to provide an outfall biological filter system, which realizes the terminal treatment of the rain and sewage mixed outfall through the inner ring gabion and the outer ring overflow weir, and greatly improves the water quality entering the lake.

[0006] In order to achieve the above invention purpose, the present invention provides the following technical solutions:

[0007] The present invention provides an outfall biological filter system, including:

[0008] An inner ring gabion, the area of the inner ring gabion is determined according to the average daily drainage volume of the outfall according to a hydraulic retention time of 4 h;

[0009] An outer ring overflow weir, the outer ring overflow weir adopts a triangular overflow weir, and graded crushed stones are filled inside the outer ring overflow weir, and sandy soil is selected for the surface layer of 30 cm;

[0010] A biological matrix, the biological matrix is located inside the inner ring gabion, the biological matrix includes volcanic rock, longba rock, and biological ceramsite, and the porosity of the biological matrix is greater than or equal to 40%;

[0011] A hygrophytic plant, the hygrophytic plant is an emergent plant, and a variety with strong pollution tolerance and well-developed roots is selected.

[0012] Preferably, the top height of the inner ring gabion is controlled according to the normal water level.

[0013] Preferably, graded materials are laid on the lake bottom within the range of the inner ring gabion, and the graded materials include 500 - 800 mm stones, 30 - 50 mm crushed stones, and 10 - 20 mm gravels to achieve sufficient oxygen enrichment in the inner ring.

[0014] Preferably, the water depth of the inner gabion is 120 - 150 cm.

[0015] Preferably, the width between the inner gabion and the outer overflow weir is 2 m.

[0016] Preferably, the water depth of the outer overflow weir is less than or equal to 50 cm.

[0017] Preferably, the top of the outer overflow weir is 5 - 10 cm higher than the normal water level to achieve the effects of energy efficiency, uniform water distribution, and micro-aeration.

[0018] Preferably, the emergent plants include reed, giant reed, umbrella plant, pickerelweed, and softstem bulrush.

[0019] Compared with the prior art, the technical solutions of the embodiments of the present invention have the following beneficial effects:

[0020] A sewage outlet biological filter system provided by an embodiment of the present invention includes: an inner gabion, the area of the inner gabion is determined according to the average daily drainage volume of the sewage outlet according to a hydraulic retention time of 4 h; an outer overflow weir, the outer overflow weir adopts a triangular overflow weir, and the inner part of the outer overflow weir is filled with graded crushed stones, and sandy soil is selected for the surface layer of 30 cm; a biological matrix, the biological matrix is located inside the inner gabion, the biological matrix includes volcanic rock, bagasse rock, and biological ceramsite, and the porosity of the biological matrix is greater than or equal to 40%; wetland plants, the wetland plants are emergent plants, and varieties with pollution tolerance and well-developed root systems are selected. Through the inner gabion and the outer overflow weir, the terminal treatment of the rain and sewage mixed discharge outlet is realized, and the water quality entering the lake is greatly improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic structural diagram of a sewage outlet biological filter system provided by an embodiment of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0022] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Apparently, the described embodiments are some, but not all, of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0023] The technical solutions of the present invention will be described in detail below with specific embodiments. The following specific embodiments can be combined with each other, and the same or similar concepts or processes may not be repeated in some embodiments.

[0024] The object of the present invention is to provide an outfall biological filter system, which realizes the terminal treatment of the rain and sewage mixed outfall through the inner ring gabion and the outer ring overflow weir, and greatly improves the water quality of the lake

[0025] In order to achieve the above object of the invention, the present invention provides the following technical solutions:

[0026] As Figure 1 shown, the present invention provides an outfall biological filter system, including:

[0027] Inner ring gabion, the area of the inner ring gabion is determined according to the daily average drainage volume of the outfall according to the hydraulic retention time of 4h;

[0028] Outer ring overflow weir, the outer ring overflow weir adopts a triangular overflow weir, the inner part of the outer ring overflow weir is filled with graded gravel, and the surface layer of 30cm is selected with sandy soil;

[0029] Biological matrix, the biological matrix is located inside the inner ring gabion, the biological matrix includes volcanic rock, longba rock, and biological ceramsite, and the porosity of the biological matrix is required to be greater than or equal to 40%;

[0030] Hydrophytes, the hydrophytes are emergent plants, and varieties with pollution tolerance and well-developed roots are selected.

[0031] Specifically, the matrix voids of the biological matrix have comprehensive functions such as filtration, adsorption, and biofilm purification.

[0032] In specific implementation, the top height of the inner ring gabion is controlled according to the normal water level.

[0033] In specific implementation, graded materials are laid on the lake bottom within the range of the inner ring gabion, and the graded materials include 500-800mm stones, 30-50mm gravels, and 10-20mm gravels to achieve sufficient oxygenation in the inner ring.

[0034] In specific implementation, the water depth of the inner ring gabion is 120-150cm.

[0035] In specific implementation, the width between the inner ring gabion and the outer ring overflow weir is 2m.

[0036] In specific implementation, the water depth of the outer ring overflow weir is less than or equal to 50cm.

[0037] In specific implementation, the top of the outer ring overflow weir is 5-10cm higher than the normal water level to achieve the effects of efficiency, uniform water distribution, and micro-aeration.

[0038] In specific implementation, the emergent plants include reed, giant reed, umbrella plant, pickerelweed, and softstem bulrush.

[0039] In summary, a drain outlet biological filter system provided by an embodiment of the present invention includes: an inner ring gabion, the area of the inner ring gabion being determined according to the average daily drainage volume of the drain outlet in accordance with a hydraulic retention time of 4 h; an outer ring overflow weir, the outer ring overflow weir being a triangular overflow weir, the inner part of the outer ring overflow weir being filled with graded broken stones, and sandy soil being selected for the surface layer of 30 cm; a biological matrix, the biological matrix being located inside the inner ring gabion, the biological matrix including volcanic rock, longba rock, and biological ceramsite, the porosity of the biological matrix being greater than or equal to 40%; and hygrophytic plants, the hygrophytic plants being emergent plants, and varieties with pollution tolerance and well-developed root systems being selected. Through the inner ring gabion and the outer ring overflow weir, the end treatment of the rain and sewage mixed drain outlet is realized, and the water quality entering the lake is greatly improved.

[0040] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit them. Although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some or all of the technical features. However, such modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A biological filter system for a drainage outlet, characterized in that, Including: Inner ring gabion, the area of the inner ring gabion is determined according to the average daily drainage volume of the drainage outlet according to a hydraulic retention time of 4 h; Outer ring overflow weir, the outer ring overflow weir adopts a triangular overflow weir, the outer ring overflow weir is filled with graded broken stones, and sandy soil is selected for the surface layer of 30 cm; Biological matrix, the biological matrix is located inside the inner ring gabion, the biological matrix includes volcanic rock, longba rock, and biological ceramsite, and the porosity of the biological matrix is greater than or equal to 40%; Hygrophytic plants, the hygrophytic plants are emergent plants, and varieties with pollution resistance and well-developed root systems are selected.

2. The outlet biological filter system according to claim 1, characterized in that, The top height of the inner ring gabion is controlled according to the normal water level.

3. The outlet biological filter system according to claim 1, characterized in that, Graded materials are laid on the lake bottom within the range of the inner ring gabion, and the graded materials include 500 - 800 mm stones, 30 - 50 mm crushed stones, and 10 - 20 mm gravels to achieve sufficient oxygen enrichment in the inner ring.

4. The outlet biological filter system according to claim 1, wherein The water depth of the inner ring gabion is 120 - 150 cm.

5. The effluent biofilter system according to claim 1, characterized in that, The width between the inner ring gabion and the outer ring overflow weir is 2 m.

6. The outlet biological filter system according to claim 1, characterized in that, The water depth of the outer ring overflow weir is less than or equal to 50 cm.

7. The outlet biological filter system according to claim 1, wherein The top of the outer ring overflow weir is 5 - 10 cm higher than the normal water level to achieve the effects of efficiency, uniform water distribution, and micro-aeration.

8. The outlet biological filter system according to claim 1, characterized in that, The emergent plants include reed, giant reed, umbrella plant, pickerelweed, and softstem bulrush.

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