WO2022007873A1 - Assembled in situ ecological treatment system for overflow rain sewage - Google Patents

Abstract

The present invention relates to an assembled in situ ecological treatment system for overflow rain sewage. The structure of the system is characterized in that a concrete box-type folded plate foundation is arranged at the bottom of a treated lake or riverway, an HDPE impermeable membrane, a water distribution pipeline, a graded broken stone layer, a gabion cage biological filler layer and artificial waterweeds are successively and fully laid on the concrete box-type folded plate foundation, and the depth of the concrete box-type folded plate foundation is equal to the thickness of the graded broken stone layer; an ecological filter dam maintenance structure is hoisted around the upper portion of the concrete box-type folded plate foundation; and a water intake pipe, a water output pipe and an overflow pipe are arranged in a catch basin, horizontal grids are arranged in the catch basin at equal heights, and the overflow pipe is connected to the water distribution pipeline in the concrete box-type folded plate foundation by means of a flow guide channel. In the present invention, sewage is guided to the lowest point of an ecological treatment system and is connected to same so as to flow upwards, no obvious odor or black water flow phenomenon exists, and the landscape effect is good; and a biological filter and an underwater forest treatment system are constructed, the impact load resistance is high, the treatment effect is good, assembly construction can be carried out, and a good popularization effect for overflow mixed rain and sewage treatments is achieved.

Description

A prefabricated in-situ ecological treatment system for overflow rainwater and sewage technical field

The invention is designed in the field of sewage treatment, especially the treatment of overflow rainwater and point-source black and odorous water bodies, etc., in particular, an assembled in-situ ecological treatment system for overflow rainwater and sewage.

Background technique

At present, most cities in my country still adopt the closed-flow combined drainage system. During heavy rains, the overflow rainwater contains sewage pollutants in the dry season, surface runoff scouring particles and rotten sediment from pipes, and the water quality is very poor. It causes serious harm to the environment, aquatic organisms and human health and threatens human health. Therefore, the effective control of overflow rainwater and sewage pollution has very important practical significance for reducing the multiple functions of water bodies.

However, there is no mature technology and equipment for the treatment of overflow rainwater and sewage. The Chinese patent (201711445564.6) provides a river overflow pretreatment system, but there are still some problems, such as the maintenance structure is a temporary structure with poor stability; the water flow is surface flow, and the filtration effect of the gravel filter layer is limited.

SUMMARY OF THE INVENTION

The purpose of the present invention is to solve the problem of water pollution caused by mixed flow of rain and sewage and point source black and odorous water bodies in the prior art, and to provide an in-situ ecological treatment system of overflow rain and sewage assembly, which adopts the overflow rain and sewage assembly original The ecological treatment system can basically be prefabricated in advance, assembled in construction, and the sewage outlet can be hidden, no obvious odor, and a small footprint. It can be set in a certain shape according to the local landscape requirements.

The present invention adopts the following technical solutions:

A prefabricated in-situ ecological treatment system for overflow rainwater and sewage, including interception wells, horizontal grilles, diversion channels, concrete box-type folded plate foundations, HDPE anti-seepage membranes, water distribution pipes, graded gravel layers, and binge cages External maintenance structure of biological filler layer, artificial aquatic plants and ecological filter dam; it is characterized in that: the concrete box-type folded plate foundation is set at the bottom of the treated lake or river, and the concrete box-type folded plate foundation is fully covered with HDPE anti-seepage membrane, HDPE anti-seepage film A water distribution pipeline is set on the permeable membrane, a graded gravel layer is installed on the water distribution pipeline, and a Binger cage biological filler layer is hoisted on the graded gravel layer. The artificial aquatic plants are evenly arranged and fixed on the mesh of the Binger cage biological filler layer, and the concrete box The depth of the folded plate foundation is equal to the thickness of the graded gravel layer; the maintenance structure of the ecological filter dam is hoisted around the upper part of the concrete box folded plate foundation; the interception well is provided with a water inlet pipe, a water outlet pipe and an overflow pipe, and the height in the interception well is equal A horizontal grid is set up, and the overflow pipe is connected to the water distribution pipe in the concrete box-type folded plate foundation through the diversion channel.

The interception well is provided with a filter screen.

The top of the diversion channel is provided with an overflow port.

The concrete box-type folded plate foundation is made of reinforced concrete, which is fixed with the bottom of the lake or river.

The HDPE impermeable membrane is fully laid with a single layer, and a pressure top is set.

The water distribution pipeline is composed of a water distribution main pipe and several water distribution branch pipes, each water distribution branch pipe is provided with several water distribution holes, and several water distribution branch pipes are respectively connected with the water distribution main pipe. outlet pipe.

The thickness of the graded crushed stone layer is 0.5-3.0m, which is laid in layers, and the particle size of the filter material of the lowermost layer is 70-100mm.

The biological filler of the Binger cage biological filler layer is selected from zeolite or ceramsite, and the particle size is preferably 2-3mm.

The artificial aquatic grass adopts carbon fiber grass and is arranged in groups.

The water distribution branches of the water distribution pipeline are evenly arranged, and the opening rate of the water distribution holes is 1% to 1.5%.

The principle of the invention is as follows: a horizontal grid and a filter screen are arranged in the existing interception well, which can preliminarily remove the floating objects, larger particles of impurities and sludge deposited in the pipeline of the overflowing rainwater and sewage; Introduce into the concrete box-type folded plate foundation, which can eliminate the obvious black water and odor; after the water is evenly distributed, it flows upward, and passes through the graded gravel layer and the Binger cage biological filler layer in turn to form a biological filter to remove the water in the water. It contains carbon pollutants, some nitrogen and phosphorus pollutants, and can partially absorb impurities in water; through artificial aquatic plants, the upper, middle and lower three-dimensional structural layers are formed, with porous structure and high specific surface area, which can enrich microorganisms and form "aerobic- The microenvironment of the facultative oxygen-anaerobic" composite structure realizes nitrification and denitrification; through the external maintenance of the ecological filter dam, the built-in ecological filter material can absorb and remove part of the remaining pollutants, and ensure the integration of internal and external water.

During the rainstorm, the overflowing rainwater has a large amount of sewage and a fast flow rate. In the present invention, the water flow forms an upward flow, and passes through the graded gravel layer and the Binger cage biological packing layer in turn, and can absorb a large amount of pollutants through contact, and the porosity is reduced, which is beneficial to Microbial adhesion and degradation; when the water is dry, the external clean water enters the treatment area through the external maintenance structure of the ecological filter dam, and flows downward through the Binger cage biological filler layer and the graded gravel layer in turn, which can be washed with water to restore the adsorption function.

The invention can filter and biodegrade the overflow rainwater entering the water body, and effectively remove SS and turbidity, carbon-containing pollutants, a certain amount of nitrogen, phosphorus pollutants and the like in the overflow rainwater.

Compared with the prior art, the present invention has more stable enclosure structure, better filtering and purifying effects, and can better solve the problem of overflow pollution from the interception well of the combined drainage system; the invention covers a small area, has a long service life, and has low treatment costs. , It has strong anti-volume impact load capacity and can be assembled and constructed. It is an in-situ ecological treatment system for overflow rainwater and sewage with good treatment effect, which is worthy of popularization and application.

Description of drawings

FIG. 1 is a schematic sectional view of the present invention.

Figure 2 is a schematic front view of the present invention.

FIG. 3 is a schematic diagram of the water distribution pipeline system of the present invention.

Figures: 1- interception well, 2- water inlet pipe, 3- water outlet pipe, 4- overflow pipe, 5- interception well horizontal grille, 6- filter screen, 7- diversion channel, 8- ecological filter dam maintenance structure , 9-Artificial aquatic plants, 10-Water distribution main pipe, 11-Concrete box-type folded plate foundation, 12-HDPE impermeable membrane, 13-Graded gravel layer, 14-Binger cage biological filler layer, 15-Water distribution branch pipe, 16- water distribution hole, 17- field.

detailed description

The present invention will be further described with reference to the accompanying drawings.

As shown in Figure 1, Figure 2, Figure 3, the present invention includes interception well 1, horizontal grid 5, filter screen 6, diversion channel 7, concrete box-type folded plate foundation 11, HDPE anti-seepage membrane 12, water distribution piping system , graded gravel layer 13, Binger cage biological filler layer 14, artificial aquatic plants 9, ecological filter dam external maintenance structure 8; it is characterized in that: the concrete box-type folded plate foundation 11 is arranged at the bottom of the treated lake or river, and the concrete The box-type folded plate foundation 11 is covered with HDPE anti-seepage membrane 12, and a water distribution pipeline is arranged on the HDPE anti-seepage membrane 12. The water distribution pipeline consists of a water distribution main pipe 10 and several water distribution branch pipes 15, and each water distribution branch pipe 15 is provided with several water distribution holes 16 , a number of water distribution branch pipes 15 are respectively connected with the water distribution main pipe 10, the water distribution pipe is equipped with a graded gravel layer 13, and the graded gravel layer 13 is hoisted with a binge cage biological filler layer 14, and the artificial aquatic plants 9 are evenly arranged and fixed on the binge On the mesh wire of the cage biological filler layer 14, the depth of the concrete box-type folded plate foundation is equal to the thickness of the graded gravel layer 13, and the ecological filter dam maintenance structure 8 is hoisted around the upper part of the concrete box-type folded plate foundation; the interception well 1 is provided with The water inlet pipe 2, the water outlet pipe 3 and the overflow pipe 4, the horizontal grid 5 and the installation filter screen 6 are arranged at the same height in the interception well 1, and the overflow pipe 4 is connected to the water distribution pipe in the concrete box-type folded plate foundation through the diversion channel .

The horizontal grid 5 is 14-16 meshes.

The diversion channel collects the effluent water from the interception well, and an overflow port is set at the top.

The concrete box-type folded plate foundation 11 is made of reinforced concrete and fixed to the bottom of the lake or river. The height of the folded plate is 2.5m and is 1.5m lower than the normal water level.

The HDPE impermeable membrane 12 adopts a single layer, is fully paved, and is provided with a pressure top.

The water distribution pipeline is composed of a water distribution main pipe 10 and several water distribution branch pipes 15. The water distribution branch pipes 15 are evenly arranged, and the opening rate of the water distribution branch pipes is 1.5%. The water distribution main pipe 10 is the main pipe of the water distribution pipeline system.

The thickness of the graded crushed stone layer 13 is 2.5m, which is laid in layers, and the particle size of the lowermost layer of filter material is 70-100mm.

Zeolite is selected as the biological filler of the Binger cage biological filler layer 14, which is filled in the finished Binger cage with a thickness of 1 m to ensure that the filler in the cage does not leak.

The artificial aquatic grass 9 is made of carbon fiber grass and arranged in groups.

The external maintenance structure 8 of the ecological filter dam is arranged on the concrete box-type folded plate foundation 11, and adopts the shallow water area prefabricated hydrophilic ecological filter dam structure of 201910711860.9. The ecological filter dam external maintenance structure 8 is connected with the concrete box-type folded plate foundation 11 and lake or The river filter dams are fixed between each other, and the external maintenance structure 8 of the ecological filter dam can be set into a rectangle, a semicircle, an ellipse, etc. according to the needs of the site.

The overflowing rainwater enters the water inlet pipe 2 of the interception well 1, and is intercepted by the horizontal grille 5 in the dry season and collected by the water outlet pipe 3 into the sewage treatment plant for treatment; After being intercepted by the horizontal grille 5, the floating objects and large particles of impurities are removed by the filter screen 6 and discharged from the overflow pipe 4; The amount of overflow sewage is directly discharged through the upper overflow port of the diversion channel 7; the mixed sewage passes through the water distribution main pipe 10 through the water distribution holes 16 of each water distribution branch pipe 15 and is evenly distributed, and then enters the graded gravel layer 13 and the binge cage organisms in turn. The filler layer 14, after sufficient contact, the filter material can absorb some pollutants, and the surface of the filter material can form a biofilm, which can biodegrade and remove carbon-containing pollutants and some nitrogen and phosphorus pollutants; The underwater forest system is fully contacted to form a microenvironment of "aerobic-facultative-anaerobic" composite structure to achieve nitrification and denitrification; the final untreated remaining pollutants are filtered and adsorbed by the ecological filter dam enclosure 8 Spread to surrounding water bodies without causing pollution to surrounding water bodies.

During the rainstorm, the overflowing rainwater has a large amount of sewage and a fast flow rate. In the present invention, the water flow forms an upward flow, and passes through the graded gravel layer and the Binger cage biological packing layer in turn, and can absorb a large amount of pollutants through contact, and the porosity is reduced, which is beneficial to Microbial adhesion and degradation; when the water is dry, the external clean water enters the treatment area through the external maintenance structure of the ecological filter dam, and flows downward through the Binger cage biological filler layer and the graded gravel layer in turn, which can be washed with water to restore the adsorption function.

Compared with the prior art, the present invention has more stable enclosure structure, better filtering and purifying effects, and can better solve the problem of overflow pollution from the interception well of the combined drainage system; the invention covers a small area, has a long service life, and has low treatment costs. , It has strong anti-volume impact load capacity and can be assembled and constructed. It is an in-situ ecological treatment system for overflow rainwater and sewage with good treatment effect, which is worthy of popularization and application.

The present invention has been demonstrated with preferred embodiments, and any person skilled in the art can make many possible changes and modifications to the technical solution of the present invention by using the technical content disclosed above without departing from the scope of the technical solution of the present invention , or modified into equivalent embodiments with equivalent variations. Therefore, any simple modifications, equivalent changes and modifications made to the above embodiments according to the technical essence of the present invention without departing from the content of the technical solutions of the present invention should fall within the protection scope of the technical solutions of the present invention.

Claims (10)

1. A prefabricated in-situ ecological treatment system for overflow rainwater and sewage, including interception wells, horizontal grilles, diversion channels, concrete box-type folded plate foundations, HDPE anti-seepage membranes, water distribution pipes, graded gravel layers, and binge cages External maintenance structure of biological filler layer, artificial aquatic plants and ecological filter dam; it is characterized in that: the concrete box-type folded plate foundation is set at the bottom of the treated lake or river, and the concrete box-type folded plate foundation is fully covered with HDPE anti-seepage membrane, HDPE anti-seepage film A water distribution pipeline is set on the permeable membrane, a graded gravel layer is installed on the water distribution pipeline, and a Binger cage biological filler layer is hoisted on the graded gravel layer. The artificial aquatic plants are evenly arranged and fixed on the mesh of the Binger cage biological filler layer, and the concrete box The depth of the folded plate foundation is equal to the thickness of the graded gravel layer; the maintenance structure of the ecological filter dam is hoisted around the upper part of the concrete box folded plate foundation; the interception well is provided with a water inlet pipe, a water outlet pipe and an overflow pipe, and the height in the interception well is equal A horizontal grid is set up, and the overflow pipe is connected to the water distribution pipe in the concrete box-type folded plate foundation through the diversion channel.
2. The prefabricated in-situ ecological treatment system for overflow rainwater and sewage according to claim 1, wherein a filter screen is arranged in the interception well.
3. The in-situ ecological treatment system of overflow rainwater and sewage as claimed in claim 1, wherein the top of the diversion channel is provided with an overflow port.
4. The prefabricated in-situ ecological treatment system for overflow rainwater and sewage according to claim 1, characterized in that: the concrete box-type folded plate foundation is made of reinforced concrete, fixed with the bottom of the lake or river, and the height of the folded plate is 0.5-3.0m , and is 1.0-2.0m lower than the normal water level.
5. The prefabricated in-situ ecological treatment system for overflow rainwater and sewage according to claim 1, characterized in that: the HDPE anti-seepage membrane is fully paved with a single layer, and a roof is provided.
6. The prefabricated in-situ ecological treatment system for overflow rainwater and sewage according to claim 1, wherein the water distribution pipe is composed of a water distribution main pipe and a plurality of water distribution branch pipes, and each water distribution branch pipe is provided with a number of water distribution holes, A plurality of water distribution branch pipes are respectively connected with the water distribution main pipe; the water-passing section of the water distribution main pipe is not smaller than the water outlet pipe of the interception well.
7. The prefabricated in-situ ecological treatment system for overflow rainwater and sewage according to claim 1, characterized in that: the thickness of the graded gravel layer is 0.5-3.0m, which is laid in layers, and the particle size of the lowermost layer of filter material is 0.5-3.0m. 70 to 100mm.
8. The prefabricated in-situ ecological treatment system for overflow rainwater and sewage according to claim 1, wherein the biological filler of the Binger cage biological filler layer is selected from zeolite or ceramsite, and the particle size is preferably 2 to 3 mm. , filled in the finished binge cage, the thickness is 1.0-2.0m.
9. The prefabricated in-situ ecological treatment system for overflow rainwater and sewage according to claim 1, wherein the artificial aquatic plants are made of carbon fiber grass and arranged in groups.
10. The prefabricated in-situ ecological treatment system for overflow rainwater and sewage according to claim 1, wherein the water distribution branch pipes of the water distribution pipeline are evenly arranged, and the water distribution hole opening rate is 1% to 1.5%.

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