CN112681489A - Sewage pipe network overflow processing system and method - Google Patents
Sewage pipe network overflow processing system and method Download PDFInfo
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- CN112681489A CN112681489A CN202011608936.4A CN202011608936A CN112681489A CN 112681489 A CN112681489 A CN 112681489A CN 202011608936 A CN202011608936 A CN 202011608936A CN 112681489 A CN112681489 A CN 112681489A
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
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- Y02W10/10—Biological treatment of water, waste water, or sewage
Abstract
The invention relates to a sewage pipe network overflow processing system and a method, wherein the system comprises a plurality of flow guide pipes, the inlets of the plurality of flow guide pipes are connected with the outlets of sewage inspection wells which frequently generate overflow phenomena, and the flow guide pipes are used for guiding out sewage overflowing from the sewage inspection wells which frequently generate overflow phenomena; the inlets of the ecological purification ponds are connected with the outlets of the flow guide pipes and are used for primarily purifying the sewage led in by the flow guide pipes; and the inlets of the ecological diversion channels are connected with the outlets of the ecological purification ponds and are used for purifying the sewage primarily purified by the ecological purification ponds again and discharging the sewage into river channels and/or lake water bodies. The system can effectively guide the rainwater and sewage mixed water retained in the original sewage pipe network system to the ecological treatment system nearby under the conditions of medium and heavy rainfall, and greatly avoids adverse effects on the surrounding water environment caused by overflow of the inspection well.
Description
Technical Field
The invention relates to a sewage pipe network overflow processing system and method, and belongs to the technical field of environmental engineering and landscape ecology.
Background
Due to the reasons of complex terrain, scattered villagers, relatively backward economic conditions and the like, drainage pipe networks in most rural areas in China have the phenomenon of incomplete or even no distribution of rain and sewage. Under non-rainfall weather conditions, the pipe network system can generally convey the collected domestic sewage to a sewage plant for treatment and discharge; however, in plum rain seasons, especially in heavy rain periods, surface runoff formed by a large amount of rainfall flows into a sewage pipe network system along mountain ditches, roadside ditches or rainwater and sewage pipelines with incomplete distribution, so that the water quantity of a sewage main pipe is increased rapidly, and the phenomenon of sewage overflow often occurs at inspection wells with low terrain or unsmooth drainage of downpipes. The overflowed sewage contains nutrient elements such as nitrogen, phosphorus and the like and other toxic and harmful substances which are input into water resource protection areas such as riverways, lakes and even drinking water source areas along with surface runoff, so that the eutrophication phenomenon of the water body in the drainage basin is caused, and the water quality health and the life guarantee of drinking water in the area and the downstream villages (residents) are seriously influenced.
The problems of non-standard design and non-in-place maintenance are the common problems of rural sewage pipe network systems in China, and even in coastal economically developed provinces such as Guangdong and Zhejiang, the rural pipe network problems are far less emphasized than those in cities and towns. Related decision-making departments generally take continuous water intake or add water treatment terminals as measures for solving the overflow phenomenon of a pipe network in rainy season, the solving idea not only neglects the actual situations of population distribution, land utilization and the like in vast rural areas, but also increases the cost of pipeline excavation, construction and later maintenance, and meanwhile, newly taken pipelines or terminals often form new point sources or invisible pollution sources because of inadequate design and maintenance. Therefore, the characteristics of water quality and water quantity overflowing from the pipe network in rainy days are accurately known, the special topography and landform and ecological environment capacity conditions of rural areas are fully utilized, and the method is the basis for solving the problem of overflowing of the sewage pipe network in rainy seasons in rural areas.
Disclosure of Invention
Aiming at the outstanding problems, the invention provides a sewage pipe network overflow treatment system and a method, the system can effectively guide the rainwater and sewage mixed water retained in the original sewage pipe network system to an ecological treatment system nearby under the conditions of medium and strong rainfall, and the adverse effect on the surrounding water environment caused by overflow of an inspection well is greatly avoided.
In order to achieve the purpose, the invention adopts the following technical scheme:
the utility model provides a sewage pipe network overflows processing system for the sewage inspection shaft that often takes place to overflow the phenomenon, still includes:
the inlets of the plurality of flow guide pipes are connected with the outlets of the sewage inspection well, and the plurality of flow guide pipes are configured to guide the sewage overflowing from the sewage inspection well out;
a plurality of ecological purification ponds, wherein inlets of the ecological purification ponds are connected with outlets of the diversion pipes, and the ecological purification ponds are configured to primarily purify sewage introduced by the diversion pipes;
and the inlets of the ecological diversion channels are connected with the outlets of the ecological purification ponds, and the ecological diversion channels are configured to purify the sewage primarily purified by the ecological purification ponds again and discharge the sewage into river channels and/or lake water bodies.
In the overflow treatment system for the sewage pipe network, preferably, the slope of the flow guide pipe in the elevation direction is not less than 0.003.
The sewage pipe network overflow processing system preferably has the inlet end pipe orifice of the draft tube being flush with the wall of the sewage inspection well in the vertical direction, and the height between the inlet end pipe bottom elevation of the draft tube and the ground elevation is not less than 0.5 m.
In the sewage pipe network overflow processing system, preferably, the pipe orifice at the outlet end of the flow guide pipe exceeds the slope protection slope wall of the ecological purification pond by 10-20 cm in the vertical direction, and the height between the bottom elevation of the outlet end of the flow guide pipe and the ground elevation is not less than 0.5 m.
The sewage pipe network overflow treatment system preferably comprises a biological membrane system constructed below the water surface.
The sewer network overflow treatment system preferably comprises:
the biological membrane filler comprises a biological membrane basic skeleton and a biological membrane filler hung on the biological membrane basic skeleton;
the biomembrane foundation framework comprises a plurality of support columns built at the bottom of the ecological purification pond, a plurality of support rods embedded at the upper end and the lower end of the plurality of support columns and a plurality of support wires fixed on the plurality of support rods.
In the sewage pipe network overflow treatment system, preferably, the support columns are vertically built at the bottom of the ecological purification pond, the support rods are embedded at the upper and lower ends of the support columns in parallel with the ground, and the support wires are fixed on the support rods in parallel with the ground to form two mesh structures which are parallel up and down.
In the overflow treatment system for the sewage pipe network, preferably, the biofilm filler comprises a PE central rope and a hydroformylation vinylon filament, and is vertically suspended at the intersection of the upper supporting filament and the lower supporting filament.
In the sewage pipe network overflow processing system, preferably, the surfaces of the support rods and the support wires are coated with an anticorrosive coating, and the thickness of the coating is 120-150 μm.
In the sewage pipe network overflow treatment system, preferably, the distance between the top of each support column and the low water level of the ecological purification pond is not less than 30cm, and the distance between every two adjacent support columns is not more than 2 m.
The sewage pipe network overflow treatment system preferably further comprises submerged plants planted above the water surface for purifying the water body, and the culture density of the submerged plants is 20-40 plants per square meter.
The sewage pipe network overflow processing system preferably comprises a graded packing layer and a soil layer which are sequentially laid from bottom to top.
In the sewage pipe network overflow treatment system, preferably, the laying thickness of the graded packing layer accounts for 25-40% of the whole depth of the ecological diversion canal, and the porosity of the graded packing layer is 0.3-0.5.
In the sewage pipe network overflow processing system, preferably, the permeability coefficient of the soil layer is 0.25-0.35 cm/h, and the laying thickness of the soil layer accounts for 15-30% of the overall depth of the ecological diversion trench.
The sewage pipe network overflow processing system preferably further comprises a planting and breeding herbaceous plants on the upper portion of the soil layer, and the planting density of the herbaceous plants is 15-20 plants per square meter.
The sewage pipe network overflow processing system preferably further comprises gramineae plants for fixing soil on the slope protection at two sides of the ecological diversion trench, and the planting density of the gramineae plants is 40-60 plants per square meter.
In the sewage pipe network overflow treatment system, preferably, a plurality of the ecological purification ponds are connected in series or in parallel through the ecological diversion channel, and the linear distance between two adjacent ecological purification ponds is not less than 500 m.
Based on the sewage pipe network overflow processing system, the invention also provides a processing method of the system, which comprises the following steps:
rainwater and sewage which are retained in a sewage inspection well which often generates an overflow phenomenon are guided to the ecological purification pond through the guide pipe along the elevation direction, the ecological purification pond primarily treats the rainwater and sewage through plant absorption and microbial degradation, the ecological guide channel guides the primarily treated rainwater and sewage to the next ecological purification pond, pollutants are retained and removed again through the filtering action of the grading packing layer and the soil layer arranged in the ecological guide channel and the absorption action of plants planted on the revetments at two sides of the ecological guide channel, and the purified rainwater and sewage are finally discharged into river channels and/or lake water bodies.
Due to the adoption of the technical scheme, the invention has the following advantages:
1. the sewage pipe network overflow processing system firstly guides the rain sewage which is overflowed originally to the ecological purification pond system from the source, and prevents nutrient substances such as nitrogen, phosphorus and other risk substances carried in the rain sewage from flowing into a natural water body through surface runoff; secondly, the ecological purification pond temporarily stores and dilutes the collected rain sewage, and fully plays the degradation function of underwater microorganisms and the absorption function of aquatic plant roots on the basis; and thirdly, the ecological diversion canal intercepts and removes pollutants such as suspended particles, nitrogen, phosphorus and the like contained in the water body, thereby reducing the pollution load input into the water environment.
2. The plants adopted by the sewage pipe network overflow treatment system have strong pollutant digestion capacity and regeneration capacity, are suitable for the ecological restoration process of the water body, and can solve the problems of watershed water environment pollution, water body eutrophication and the like caused by overflow of the sewage inspection well in rainy days.
3. The sewage pipe network overflow processing system can effectively guide the rainwater and sewage mixed water retained in the original sewage pipe network system to the ecological processing system nearby under the conditions of medium and strong rainfall, and greatly avoids the adverse effect on the surrounding water environment caused by overflow of an inspection well. The ecological treatment system integrates the rainwater dilution effect, the plant absorption effect, the microbial degradation effect and the interception and filtration effect of the graded filler, greatly intercepts and removes particle suspended matters, nitrogen, phosphorus and other nutrient substances and other risk substances contained in the water body, and provides a solid guarantee for the ecological safety of downstream water. In addition, the system guides a part of 'sewage' with lower concentration to the ecological treatment system, and can also effectively help a downstream sewage treatment plant to relieve the treatment pressure caused by sudden change of water quality and water quantity.
4. The sewage pipe network overflow treatment system can guide rain sewage in the pipe network to the ecological system for treatment under the rainfall weather condition, and can also slowly guide farmland return water containing high nitrogen and high phosphorus to the ecological purification pond for water purification and nutrient element removal through the ecological guide channel under the rainfall-free weather condition. Therefore, the overflow treatment system for the sewage pipe network can play an active role in the aspect of prevention and control of agricultural non-point source pollution.
Drawings
FIG. 1 is a side view of a system for solving the problem of overflow of a sewer network in rainy season in rural areas according to an embodiment of the present invention;
FIG. 2 is a plan view of the system for solving the overflow problem of the sewage pipe network in the rainy season in the rural areas according to the embodiment of the present invention;
FIG. 3 is a side view of the draft tube provided in accordance with this embodiment of the present invention;
FIG. 4 is a schematic view of a biofilm system provided in this embodiment of the present invention;
FIG. 5 is a cross-sectional view of the ecological diversion trench provided in the embodiment of the present invention;
the reference numerals in the figures are as follows:
1-a flow guide pipe and 11-a screen; 2-ecological purification pond, 21-support column, 22-support rod, 23-support wire and 24-biomembrane filler; 3-ecological diversion canal, 31-grading filler layer, 32-soil layer, 33-herbaceous plant and 34-gramineous plant.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention are described clearly and completely below, and it is obvious that the described embodiments are some, not all embodiments of the present invention. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention.
Unless defined otherwise, technical or scientific terms used herein shall have the ordinary meaning as understood by one of ordinary skill in the art to which this invention belongs. The use of "first," "second," and similar terms in the present application do not denote any order, quantity, or importance, but rather the terms are used to distinguish one element from another. The word "comprising" or "comprises", and the like, means that the element or item listed before the word covers the element or item listed after the word and its equivalents, but does not exclude other elements or items. The terms "connected" or "coupled" and the like are not restricted to physical or mechanical connections, but may include electrical connections, whether direct or indirect.
In view of the above, the coping strategy for the overflow phenomenon of the rural rainy season sewage inspection well is changed from the traditional method of rehandling, adding a processing terminal and the like into an ecological processing strategy based on the principle of 'guide-clean-filter', and the strategy fully utilizes the ecological environment capacity advantage and the topographic features of vast rural areas to realize the ultra-clean discharge of the rain sewage.
In the invention, "guide" means that in the rainfall weather of medium intensity or above, when the water level of the sewage inspection well rises to the pipe orifice of the guide pipe 1, the guide pipe 1 guides the overflowing rainwater and sewage into the ecological purification pond 2 in a gravity flow mode; "clean" means that the ecological purification pond 2 absorbs and degrades nutritive salt and other pollutants in water by utilizing a biological membrane system and submerged plants; the filtration means that the rain sewage primarily purified by the ecological purification pond 2 is filtered and removed by the granular suspended matters and pollutants in the water by using the fillers and the herbaceous plants in the ecological diversion canal 3. The ecological treatment strategy of 'guide-cleaning-filtration' intercepts and removes suspended substances, nutrient substances and risk substances in the rain and sewage mixed water through the biological, physical and chemical actions of plants, microbial communities and paved fillers, thereby achieving the purpose of improving the water quality of the drainage basin.
As shown in fig. 1, the system for solving the overflow problem of the sewage pipe network in the rainy season in the rural area provided by the embodiment comprises a flow guide pipe 1, ecological purification ponds 2 connected with the outlet ends of the flow guide pipe 1, and ecological flow guide channels 3 connected with the outlets of the ecological purification ponds 2. The honeycomb duct 1 adopts HDPE double-walled bellows, and the pipe diameter is DN300, and the slope of the honeycomb duct 1 in the elevation direction should be not less than 0.003. The ecological purification pond 2 constructs a biological membrane system below the water surface, and plants submerged plants with a water body restoration function above the water surface; optionally, the submerged plant is selected from at least one of Focus urocarpus, Goldfish algae, curly pondweed, Black algae and Caziye, and the culture density of the submerged plant is 20-40 plants/square meter. The depth of the ecological diversion trench 3 is 0.8-1.2 m, the width is 0.4-0.6 m, and the slope drop in elevation is less than 0.002.
Further, the arrangement of the system for solving the overflow problem of the sewage pipe network in the rainy season in the rural area in the plane direction is shown in fig. 2. In order to avoid the occurrence of blockage, unsmooth drainage and the like, the length of the draft tube 1 is less than 100m, and the turning times of the draft tube 1 in the horizontal direction are reduced as much as possible. In order to save cost and reduce land occupation rate, the ecological purification pond 2 can be excavated according to new topographic design, and can also be transformed by fully utilizing the original natural pond or waste pond. Wherein, the ecological purification ponds 2 connected with the draft tube 1 should be as close to the sewage inspection well as possible, and the linear distance between two adjacent ecological purification ponds 2 should be not less than 500 m. In order to ensure that water flow can slowly and stably flow, the ecological diversion canal 3 is arranged along a farmland drainage ditch and a forest and grass land side canal in a winding manner as far as possible. Similarly, for saving cost and reducing land occupation, the ecological diversion canal 3 should be transformed on the basis of the original farmland drainage ditch and the forest lawn side canal as much as possible. In addition, according to the characteristics of the quality of the rainwater and sewage, the plurality of ecological purification ponds 2 can be connected in series through the ecological diversion channel 3, and a plurality of systems consisting of the diversion pipe 1, the ecological purification ponds 2 and the ecological diversion channel 3 can be connected in parallel to form a multi-stage rainwater and sewage quality ecological purification system, so that ultra-clean discharge is realized.
As a preferred embodiment of the invention, the pipe orifice at the inlet end of the draft tube 1 is flush with the wall of a sewage inspection well which is frequently overflowed in the vertical direction, and the height from the bottom of the inlet end of the draft tube 1 to the ground is not less than 0.5 m.
As a preferred embodiment of the present invention, as shown in fig. 3, the draft tube 1 is preferably buried under a non-motor vehicle running road surface and a non-load-bearing ground surface to a depth of not less than 0.5 m. If the honeycomb duct 1 needs to bear ground load to a certain degree, the embedding depth needs to be correspondingly increased, and pressure-resistant measures need to be taken in the embedding process; further, the pipe orifice at the inlet end of the draft tube 1 is flush with the wall of the inspection well in the vertical direction, and the joint of the draft tube 1 and the wall of the inspection well is subjected to anti-seepage treatment by adopting 32# waterproof cement mortar; and the pipe orifice at the outlet end of the guide pipe 1 should exceed the slope protection slope wall of the ecological purification pond 2 by 10-20 cm in the vertical direction, and the distance between the elevation of the pipe bottom at the outlet end of the guide pipe 1 and the elevation of the ground is not less than 0.5 m.
Furthermore, in order to prevent branches, garbage and other impurities mixed in the original rain sewage from blocking the flow guide pipe 1 or flowing into the ecological purification system, a stainless steel screen mesh 11 is installed at a pipe orifice at the inlet end of the flow guide pipe 1, and the size of the screen mesh is 4-10 mm; the stainless steel screen mesh 11 is preferably made of 304 stainless steel with corrosion resistance and strong oxidation resistance, and is fixed on the wall of the inspection well in front of the nozzle of the draft tube 1 in a riveting mode.
In another preferred embodiment of the present invention, as shown in fig. 4, the biofilm foundation framework of the ecological purification pond 2 is composed of support columns 21 built on the bottom of the ecological purification pond 2, support rods 22 embedded at the upper and lower ends of the support columns 21, and stainless steel support wires 23 fixed to the support rods 22. The supporting column 21 is formed by brick laying or reinforced concrete pouring, and the bottom of the supporting column 21 needs to be provided with a foundation to ensure the stability of the column body; further, the distance between the tops of the support columns 21 and the low water level of the ecological purification pond 2 is not less than 30cm, and the distance between every two adjacent support columns 21 is not more than 2 m. The support rods 22 are embedded in the building or pouring process of the support columns 21, the support rods 22 are seamless steel tubes made of Q235-A, and the outer diameters of the steel tubes can be 30-50 mm. After the supporting rod 22 is embedded, anticorrosive epoxy resin and epoxy asphalt materials are coated on the surface of the supporting rod 22 and the embedded joint, and the coating thickness of a paint film is 120-150 micrometers. The stainless steel supporting wires 23 are fixed on the two parallel supporting rods 22 through steel wire buckles, the distance between every two adjacent stainless steel supporting wires 23 is 20cm, and the joint of the steel wire buckles and the stainless steel supporting wires 23 needs to be subjected to anticorrosion treatment; the stainless steel support wires 23 fixed on the support rod 22 are crossed in a longitudinal and transverse direction of 90 degrees to form two mesh structures which are parallel up and down. Preferably, the support rod 22 embedded in the upper end of the support column 21 is 10cm away from the top of the support column 21, and the support rod 22 embedded in the lower end of the support column 21 is 20cm away from the bottom of the ecological purification pond 2.
In still another preferred embodiment of the present invention, as shown in fig. 5, the ecological diversion trench 3 is provided with a graded packing layer 31 and a soil layer 32 from bottom to top. Wherein, the paving thickness of the graded packing layer 31 accounts for 25-40% of the depth of the ecological diversion trench 3, and the paving thickness of the soil layer 32 accounts for 15-30% of the depth of the ecological diversion trench. Optionally, the graded packing layer 31 is laid according to a ratio of at least two of limestone, zeolite, vermiculite, blast furnace slag, shale, volcanic rock and ceramsite according to particle size. Also optionally, soil layer 32 is a soft textured clay or loam. The paved graded packing layer 31 and the soil layer 32 do not need to be tamped, so that the porosity of the graded packing layer 31 is ensured to be 0.3-0.5, and the permeability coefficient of the soil layer 32 is 0.25-0.35 cm/h.
Planting herbaceous plants 33 on the soil layer 32, wherein optionally, the herbaceous plants 33 are at least one of iris, calamus, reed or vetiver grass, and the planting density is 15-20 plants per square meter. In order to stabilize the side slope and strengthen the filtering capacity of the ecological diversion trench 3, the embodiment further comprises planting gramineae 34 capable of fixing soil on the slope protection at two sides of the ecological diversion trench 3, wherein the gramineae 34 is selected from at least one of paspalum distichum, ryegrass, green holly and zoysia japonica, and the planting density is 40-60 plants per square meter.
To sum up, the system for solving the problem of overflowing of the sewage pipe network in the rainy season in the rural areas provided by the invention has the following rainwater and sewage diversion and ecological restoration processes (an optimal restoration process):
the inspection well which is easy to overflow → the diversion pipe 1 → the ecological purification pond 2 → the ecological diversion canal 3 → the river and/or lake water body. Namely, rainwater and sewage retained in the inspection well is guided to the ecological purification pond 2 through the guide pipe 1 in the elevation direction in the drawing 1, the ecological purification pond 2 conducts primary treatment on the rainwater and sewage through plant absorption and microbial degradation, and the ecological guide channel 3 slowly guides the primarily treated rainwater and sewage to the next ecological purification pond 2 and simultaneously intercepts and removes pollutants again through the filtering action of filler and soil and the absorption action of plants. The ecological purification ponds 2 and the ecological diversion channels 3 are alternately connected to form a multi-stage ecological treatment system, and the treated rain sewage is finally discharged into nearby river channels and/or lake water bodies.
Therefore, the system for solving the problem of overflowing of the sewage pipe network in the rainy season in the rural area can effectively guide the rainwater and sewage mixed water retained in the original sewage pipe network system to the ecological treatment system nearby under the conditions of medium and strong rainfall, and greatly avoids the adverse effect on the surrounding water environment caused by overflowing of the inspection well. The ecological treatment system integrates the rainwater dilution effect, the plant absorption effect, the microbial degradation effect and the interception and filtration effect of the graded filler, greatly intercepts and removes particle suspended matters, nitrogen, phosphorus and other nutrient substances and other risk substances contained in the water body, and provides a solid guarantee for the ecological safety of downstream water. In addition, the system for solving the problem of overflowing of the sewage pipe network in rainy season in the rural area guides a part of sewage with lower concentration to the ecological treatment system, and can also effectively help a downstream sewage treatment plant to relieve the treatment pressure caused by sudden change of water quality and water quantity.
Particularly, the system for solving the problem of overflowing of the sewage pipe network in rainy seasons in rural areas provided by the invention can guide the rainwater and sewage in the pipe network to the ecological system for treatment under the rainfall weather condition, and can also slowly guide the returned high-nitrogen and high-phosphorus farmland water to the ecological purification pond 2 for water purification and nutrient element removal through the ecological guide channel 3 under the rainfall-free weather condition. Therefore, the system for solving the problem of overflow of the sewage pipe network in the rainy season in the rural areas can play an active role in the aspect of prevention and control of agricultural non-point source pollution.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (18)
1. The utility model provides a sewage pipe network overflows processing system for the sewage inspection shaft that the overflow phenomenon takes place for often, its characterized in that includes:
the inlet of each draft tube (1) is connected with the outlet of the sewage inspection well, and each draft tube (1) is configured to guide the sewage overflowing from the sewage inspection well out;
a plurality of ecological purification ponds (2), wherein the inlets of the ecological purification ponds (2) are connected with the outlets of the diversion pipes (1), and the ecological purification ponds (2) are configured to primarily purify the sewage introduced by the diversion pipes (1);
the ecological diversion channels (3), the inlets of the ecological diversion channels (3) are connected with the outlets of the ecological purification ponds (2), and the ecological diversion channels (3) are configured to purify the sewage primarily purified by the ecological purification ponds (2) and discharge the sewage into river channels and/or lake water bodies.
2. The sewer network overflow treatment system of claim 1, wherein the slope of the draft tube (1) in the elevation direction is not less than 0.003.
3. The sewer network overflow processing system of claim 1, wherein the inlet end orifice of the draft tube (1) is flush with the wall of the sewage inspection well in the vertical direction, and the bottom elevation of the inlet end orifice of the draft tube (1) is not less than 0.5m from the ground elevation.
4. The sewer network overflow processing system of claim 1, wherein the outlet end orifice of the draft tube (1) is vertically 10-20 cm higher than the slope protection slope wall of the ecological purification pond (2), and the height of the outlet end orifice of the draft tube (1) is not less than 0.5m from the ground elevation.
5. The sewer network overflow treatment system of claim 1, wherein the ecological purification pond (2) comprises a biofilm system constructed below the water surface.
6. The sewer network overflow treatment system of claim 5, wherein the biofilm system comprises:
a biofilm foundation framework and a biofilm filler (24) suspended on the biofilm foundation framework;
the biomembrane foundation framework comprises a plurality of support columns (21) built at the bottom of the ecological purification pond (2), a plurality of support rods (22) embedded at the upper end and the lower end of the plurality of support columns (21) and a plurality of support wires (23) fixed on the plurality of support rods (22).
7. The sewer network overflow treatment system of claim 6, wherein a plurality of support columns (21) are vertically built on the bottom of the ecological purification pond (2), a plurality of support rods (22) are embedded at the upper and lower ends of the plurality of support columns (21) in parallel with the ground, and a plurality of support wires (23) are fixed on the plurality of support rods (22) in parallel with the ground to form two mesh structures which are parallel up and down.
8. The sewer network overflow treatment system of claim 7, wherein the biofilm carrier (24) comprises PE central rope and hydroformylated vinylon filaments, and the biofilm carrier (24) is suspended vertically from the intersection of the upper end support filaments (23) and the intersection of the lower end support filaments (23).
9. The sewer network overflow processing system of claim 8, wherein the surfaces of the support rods (22) and the support wires (23) are coated with an anticorrosive coating, and the coating thickness is 120-150 μm.
10. The sewer network overflow treatment system of claim 9, wherein the distance from the top of the support columns (21) to the dry water level of the ecological purification pond (2) is not less than 30cm, and the distance between two adjacent support columns (21) is not more than 2 m.
11. The sewer network overflow treatment system of claim 5, wherein the ecological purification pond (2) further comprises submerged plants planted above the water surface for purifying the water body, and the culture density of the submerged plants is 20-40 plants per square meter.
12. The sewer network overflow treatment system of claim 1, wherein the ecological diversion canal (3) comprises a graded packing layer (31) and a soil layer (32) which are sequentially laid from bottom to top.
13. The sewer network overflow processing system of claim 12, wherein the laying thickness of the graded packing layer (31) accounts for 25-40% of the overall depth of the ecological diversion trench (3), and the porosity of the graded packing layer (31) is 0.3-0.5.
14. The sewer network overflow processing system of claim 12, wherein the permeability coefficient of the soil layer (32) is 0.25-0.35 cm/h, and the laying thickness of the soil layer (32) accounts for 15-30% of the whole depth of the ecological diversion trench (3).
15. The sewer network overflow treatment system of claim 12, wherein the ecological diversion trench (3) further comprises a herbaceous plant (33) planted on the upper portion of the soil layer (32), and the herbaceous plant (33) is planted at a density of 15-20 plants per square meter.
16. The sewer network overflow processing system of claim 12, wherein the ecological diversion trench (3) further comprises gramineae plants (34) for fixing soil on the revetment at two sides of the ecological diversion trench (3), and the planting density of the gramineae plants (34) is 40-60 plants/square meter.
17. The sewer network overflow treatment system of claim 1, wherein a plurality of ecological purification ponds (2) are connected in series or in parallel through the ecological diversion trench (3), and the linear distance between two adjacent ecological purification ponds (2) is not less than 500 m.
18. A method of treating a sewer overflow system of any of claims 1-17, comprising the steps of:
rainwater and sewage which are retained in a sewage inspection well which often generates an overflow phenomenon are guided to the ecological purification pond (2) through the guide pipe (1) along the elevation direction, the ecological purification pond (2) conducts primary treatment on the rainwater and sewage through plant absorption and microbial degradation, the ecological guide channel (3) guides the primarily treated rainwater and sewage to the next ecological purification pond (2), and meanwhile pollutants are retained and removed again through the filtering action of the grading packing layer (31) and the soil layer (32) in the ecological guide channel (3) and the absorption action of plants planted on the revetments at two sides of the ecological guide channel (3), and the purified rainwater and sewage are finally discharged into river channels and/or lake water bodies.
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| CN211057960U (en) * | 2019-03-27 | 2020-07-21 | 山东省环科院环境工程有限公司 | Stepped rainwater storage and purification ecological retention system |
| CN211896515U (en) * | 2019-12-05 | 2020-11-10 | 湖南中彩生态环境科技有限公司 | Artificial wetland system applied to super-limit purification treatment of low-concentration polluted water body |
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2020
- 2020-12-30 CN CN202011608936.4A patent/CN112681489A/en active Pending
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|---|---|---|---|---|
| CN101575146A (en) * | 2009-05-27 | 2009-11-11 | 华东师范大学 | Self-anchored immersed ecological filter bed and method thereof for purifying micro-polluted surface water in situ |
| CN103214148A (en) * | 2013-04-18 | 2013-07-24 | 山东省分析测试中心 | Multistage-series stepped natural-type artificial wetland and construction method |
| CN205275309U (en) * | 2015-12-25 | 2016-06-01 | 江苏和合水环境有限公司 | Sewage treatment plant tail water degree of depth processing system |
| CN211057960U (en) * | 2019-03-27 | 2020-07-21 | 山东省环科院环境工程有限公司 | Stepped rainwater storage and purification ecological retention system |
| CN109914363A (en) * | 2019-04-18 | 2019-06-21 | 上海夕露环境科技有限公司 | The ecology remodeling method of concrete open drain |
| CN211896515U (en) * | 2019-12-05 | 2020-11-10 | 湖南中彩生态环境科技有限公司 | Artificial wetland system applied to super-limit purification treatment of low-concentration polluted water body |
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