CN215250294U - Urban overflow sewage treatment system - Google Patents
Urban overflow sewage treatment system Download PDFInfo
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- CN215250294U CN215250294U CN202121709771.XU CN202121709771U CN215250294U CN 215250294 U CN215250294 U CN 215250294U CN 202121709771 U CN202121709771 U CN 202121709771U CN 215250294 U CN215250294 U CN 215250294U
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Abstract
The utility model provides an urban overflow sewage treatment system, is including the distribution well, whirl sedimentation tank, distribution canal, wetland treatment tank and the ditch of going out that set gradually, and the distribution well passes through the inlet tube and connects two whirl sedimentation tanks respectively, and whirl sedimentation tank upper portion delivery port is connected with wetland treatment tank, and whirl sedimentation tank bottom sets up the mud pipe, and wetland treatment tank is including the plant planting soil layer, packing layer and the barrier layer that from top to bottom sets gradually. The water distribution well is arranged at the initial end of the treatment system, so that the inflowing urban overflow sewage is uniformly distributed to the two rotational flow sedimentation tanks, the water flow in the water inlet pipe enters along the tangential direction of the circular sedimentation area, and is collected by the water outlet channel at the tail end of the wetland system after being treated by the plant planting soil layer, the packing layer and the impermeable layer in the wetland treatment tank and discharged after reaching the standard. The system couples constructed wetland treatment and cyclone precipitation, ensures that the concentration of suspended matters in water can be reduced before sewage enters the wetland treatment unit, effectively avoids wetland blockage, and improves the treatment effect.
Description
Technical Field
The utility model relates to a processing system suitable for handle urban overflow sewage belongs to urban water environment and administers technical field.
Background
Due to the problem of urban water environmental pollution, combined-flow drainage systems have been modified into intercepting-type combined-flow systems or complete-flow-dividing systems. For some old cities, the realization of complete shunt system transformation is difficult due to limited urban space. Therefore, a considerable portion of the municipal drainage systems remain drainage systems that are shut-off combined flow systems.
The urban overflow sewage generally refers to urban domestic sewage and rainwater beyond the interception multiple in an interception type drainage system, and is mainly characterized by large and concentrated water volume and high concentration of suspended matters and organic matters in water. After the part of overflow sewage is directly discharged into a river channel, the river channel pollution is very easy to cause, and the part of overflow sewage is difficult to recover in a short time, so that the part of overflow sewage is a main reason for causing black and stink urban water bodies. Introducing overflow sewage into a separate treatment system for treatment has become one of the common approaches to solve the problem of urban overflow sewage pollution in the rainy period.
The method for separately treating the overflow sewage in the rainy period is more, mainly aims at removing suspended matters and organic matters in the sewage, and common treatment methods comprise precipitation, filtration, artificial wetland treatment and the like. The treatment methods such as precipitation, filtration and the like generally occupy small area and have good treatment effect, but the management and the operation are complex. The wetland treatment is adopted to treat the overflow sewage, the operation and management are simpler, the removal effect is good, the wetland treatment can be combined with urban landscape, and the urban landscape effect can be improved while the water quality is purified. However, the wetland blockage is easily caused by the excessively high concentration of suspended matters in the raw water, and the problem is the main problem of the artificial wetland treatment system in the operation process.
At present, when the artificial wetland treatment tank is designed, the concentration of suspended matters in inlet water is generally required to be not more than 80mg/l, and when the artificial wetland is adopted for treating urban overflow sewage, the existing structure is difficult to achieve the effect of water quality purification requirement.
Disclosure of Invention
To city overflow sewage suspended solid concentration height, easily cause the problem of constructed wetland jam, the utility model provides a simple structure, operation are stable, the convenient city overflow sewage treatment system of management.
The utility model discloses an urban overflow sewage treatment system adopts following technical scheme.
The system comprises a water distribution well, a rotational flow sedimentation tank, a water distribution channel, a wetland treatment tank and a water outlet channel which are sequentially arranged, wherein the water distribution well is respectively connected with two rotational flow sedimentation tanks through water inlet pipes, the water outlet at the upper part of each rotational flow sedimentation tank is connected with the wetland treatment tank, a sludge discharge pipe is arranged at the bottom of each rotational flow sedimentation tank, and the wetland treatment tank comprises a plant planting soil layer, a packing layer and an impermeable layer which are sequentially arranged from top to bottom.
The effective water depth of the water distribution well is 60-100cm, and sewage can be uniformly distributed into the two groups of cyclone sedimentation tanks through the water inlet pipe.
The upper part of the cyclone sedimentation tank is cylindrical, and the bottom of the cyclone sedimentation tank is conical. The diameter of the cylinder is 3-6 m. The water outlet at the upper part of the cyclone sedimentation tank is 10cm multiplied by 10 cm.
The water inlet pipe is tangentially connected with the rotational flow sedimentation tank, the pipe diameter of the water inlet pipe is about 50-100mm, and the water inflow speed ensures that the water flow in the sedimentation zone is in a rotational flow state.
The water distribution channel is a rectangular water tank, the width of the water distribution channel is 30cm, the effective water depth is 40cm, and an overflow water outlet weir is arranged on the outer side of the water distribution channel and used for uniformly distributing water for the plant planting area.
The height of the plant planting soil layer is 30cm, and the height of the filler layer is 20-30 cm.
The water outlet channel is connected with the water outlet end of the wetland treatment tank and used for collecting treated water, the effective water depth is 50-100cm, and the gradient of the bottom surface is 2 per mill. And one end of the water outlet channel is provided with a clean water pump.
The water distribution well is arranged at the initial end of the treatment system, so that the inflowing urban overflow sewage is uniformly distributed to the two rotational flow sedimentation tanks, the water flow in the water inlet pipe enters along the tangential direction of the circular sedimentation area, and is collected by the water outlet channel at the tail end of the wetland system after being treated by the plant planting soil layer, the packing layer and the impermeable layer in the wetland treatment tank and discharged after reaching the standard.
Above-mentioned processing system, to the characteristics that city overflow sewage suspended solid and organic matter concentration are high, strengthens the front end preliminary treatment, avoids follow-up processing unit to block up, and the back end wetland is handled and is strengthened the degree of depth of organic matter and nitrogen phosphorus and get rid of, simple structure, and the operation is stable, and purifying effect is good, and the management is convenient, and the investment is economized, is applicable to the processing of city overflow sewage, also can be used to other sewage purification of similar quality of water. The system changes the water flow state at the water inlet, forms a high-speed rotating flow line, enables suspended particles to be separated from a water body under the action of centrifugal force, and finally removes the suspended particles from the bottom of the cyclone sedimentation tank, so that the blockage of a wetland system can be effectively avoided, the pressure of a wetland treatment tank is reduced, the overflow sewage treatment effect can be improved, and the operation management and the maintenance of a wetland treatment unit are facilitated.
The utility model discloses carry out the coupling with wetland treatment and whirl sediment and be used for city overflow sewage treatment, ensure that sewage can reduce the suspended solid concentration of aquatic before getting into the wetland treatment unit, effectively avoid the wetland to block up, promote treatment.
Drawings
FIG. 1 is a schematic structural view of the overflow sewage treatment system of the present invention.
Fig. 2 is a top view of fig. 1.
Wherein: 1. the system comprises a distribution well, 2 parts of a water inlet pipe, 3 parts of a rotational flow sedimentation tank, 4 parts of a distribution canal, 5 parts of a wetland treatment tank, 6 parts of a water outlet canal, 7 parts of a plant planting soil layer, 8 parts of a packing layer, 9 parts of an impermeable layer, 10 parts of a mud discharge pipe, 11 parts of a baffle plate and 12 parts of an overflow weir.
Detailed Description
As shown in figures 1 and 2, the urban overflow sewage treatment system of the utility model mainly comprises a distribution well 1, a water inlet pipe 2, a rotational flow sedimentation tank 3, a distribution canal 4, a wetland treatment tank 5, a water outlet canal 6 and a mud pipe 10,
the foremost end of the whole treatment system is a water distribution well 1, the effective water depth in the water distribution well is 60-100cm, and sewage can be uniformly distributed into the two groups of rotational flow sedimentation tanks 3 through water inlet pipes. The water inlet pipe 2 is a pre-buried plastic pipe and is tangentially connected with the rotational flow sedimentation tank 3, the pipe diameter is 50-100mm, and the proper flow velocity is achieved in the pipe, so that the water flow in the sedimentation area is ensured to be in a rotational flow state.
The upper part of the cyclone sedimentation tank 3 is a cylinder with the diameter of 3-6m, and the bottom of the cyclone sedimentation tank is of a conical structure and is used for storing sludge. The bottom of the rotational flow sedimentation tank 3 is provided with a sludge discharge pipe 10 which discharges sludge regularly by means of static pressure. The upper part of the rotational flow sedimentation tank 3 is reserved with a water outlet connected with the water distribution channel 4, and the size of the water outlet is about 10cm multiplied by 10 cm.
The water distribution channel 4 is used for uniformly distributing water in a plant growing area, is a rectangular water tank, has the width of 30cm, and has the effective water depth of about 40 cm. The distribution channel 4 comprises a baffle plate 11 and an overflow weir 12, and the overflow weir 12 is arranged on one side corresponding to the liquid inlet of the distribution channel 4.
The wetland treatment tank 5 is provided with a plant planting soil layer 7, a packing layer 8 and an impermeable layer 9 from top to bottom in sequence. The main component of the plant planting layer 7 is planting nutrient soil with the height of about 30 cm. The height of the packing layer 8 is about 20-30cm, and the packing layer is made of gravel, zeolite, biomass charcoal and other materials, and has a particle size of about 3-5 mm. The barrier layer 9 may be cast of concrete, or clay compacted, or two HDPE films.
The water outlet channel 6 is connected with the water outlet end of the wetland treatment tank 5 and is used for collecting the treated water, the effective water depth is 50-100cm, and the gradient of the channel bottom is about 2 per mill. One end of the water outlet channel can be provided with a clean water pump.
Urban overflow sewage is firstly introduced into a distribution well 1, and the outlet water of the distribution well 1 flows into a vortex sedimentation tank 3 through a water inlet pipe 2. The water inlet pipe 2 is a connecting pipe between the water distribution well 1 and the rotational flow sedimentation tank 3, overflow sewage enters along the tangential direction of the rotational flow sedimentation tank 3 at a certain flow velocity through the water inlet pipe 2, and centrifugal force is generated under the action of a water inlet head, so that water flow is kept in a rotational flow state, and solid-liquid separation is completed under the action of the centrifugal force. The conical lower part of the cyclone sedimentation tank 3 is used for storing the sedimented sludge. The effluent after precipitation separation flows into the water distribution channel 4 through the water outlet at the upper part of the rotational flow sedimentation tank 3, the generated sludge is discharged through the sludge discharge pipe 10, most suspended solid particles in the overflow sewage are removed after precipitation separation, and the short flow and blockage of a subsequent wetland treatment tank can be effectively avoided.
The overflow sewage after the precipitation treatment enters a water distribution channel 4, a baffle plate 11 and an overflow weir 12 are arranged in the water distribution channel 4, and the baffle plate 11 is used for intercepting large floating particles in the water; the overflow weir 12 is shaped as a saw-toothed triangular weir, and is mainly used for uniformly distributing water to the wetland treatment unit in the width direction.
The wetland treatment tank 5 is a key link, plants planted in the plant planting soil layer 7 can be selected from reed, calamus, loosestrife, canna and other plant types with good water purification effect, and the packing layer 8 has strong adsorption performance and interception and filtration capacity. After the sewage enters the wetland treatment tank 5, under the action of plant roots in a plant planting soil layer 7, part of nitrogen, phosphorus, metal ions and the like in the sewage are absorbed and utilized; under the action of soil microorganisms, organic matters, ammonia nitrogen and the like are decomposed and converted; under the action of the filler medium, suspended particles in water are effectively trapped. In a word, after passing through the wetland treatment tank, indexes such as organic matters, nitrogen, phosphorus, suspended matters, metal ions and the like in water are effectively removed, and the water quality is further purified. Meanwhile, in order to avoid groundwater pollution caused by sewage infiltration, the system is provided with an impermeable layer 9.
After being treated by the wetland treatment tank 5, the treated water is collected by the water outlet channel 8, and the treated water can be returned to the river channel again and can be reasonably reused according to the water quality condition and the water demand.
Claims (10)
1. The utility model provides an urban overflow sewage treatment system, characterized by, including the distribution well, whirl sedimentation tank, distribution canal, wetland treatment tank and the ditch of going out that set gradually, the distribution well passes through the inlet tube and connects two whirl sedimentation tanks respectively, and whirl sedimentation tank upper portion delivery port is connected with the wetland treatment tank, and whirl sedimentation tank bottom sets up the mud pipe, and the wetland treatment tank is including the plant planting soil layer, packing layer and the barrier that from top to bottom sets gradually.
2. The municipal overflow sewage treatment system of claim 1, wherein the effective water depth of the distribution well is 60-100 cm.
3. The municipal overflow sewage treatment system of claim 1, wherein the cyclone sedimentation tank is cylindrical in upper section and tapered in bottom section.
4. The municipal overflow sewage treatment system of claim 3, wherein said cylindrical shape has a diameter of 3-6 m.
5. The municipal overflow sewage treatment system of claim 1, wherein the outlet at the upper part of the cyclone sedimentation tank is 10cm x 10 cm.
6. The municipal overflow sewage treatment system of claim 1, wherein the water inlet pipe is tangentially connected to the cyclone sedimentation tank.
7. The municipal overflow sewage treatment system of claim 1, wherein the diameter of the inlet pipe is 50-100 mm.
8. The municipal overflow sewage treatment system according to claim 1, wherein said distribution channel is a rectangular tank having a width of 30cm and an effective water depth of 40cm, and an overflow weir is provided on the outside.
9. The municipal overflow sewage treatment system of claim 1, wherein said plant cultivation soil layer is 30cm high and said filler layer is 20-30cm high.
10. The urban overflow sewage treatment system according to claim 1, wherein the water outlet channel is connected with the water outlet end of the wetland treatment tank, the effective water depth is 50-100cm, and the bottom gradient is 2 per mill.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121709771.XU CN215250294U (en) | 2021-07-26 | 2021-07-26 | Urban overflow sewage treatment system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121709771.XU CN215250294U (en) | 2021-07-26 | 2021-07-26 | Urban overflow sewage treatment system |
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| CN215250294U true CN215250294U (en) | 2021-12-21 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114873844A (en) * | 2022-04-20 | 2022-08-09 | 中国建筑第八工程局有限公司 | Initial rain filtering device for direct drainage river gushing gully |
| CN116425315A (en) * | 2023-05-25 | 2023-07-14 | 中交第三公路工程局有限公司 | Constructed wetland system based on electrodynamic strengthening denitrification |
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2021
- 2021-07-26 CN CN202121709771.XU patent/CN215250294U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114873844A (en) * | 2022-04-20 | 2022-08-09 | 中国建筑第八工程局有限公司 | Initial rain filtering device for direct drainage river gushing gully |
| CN114873844B (en) * | 2022-04-20 | 2023-09-01 | 中国建筑第八工程局有限公司 | Primary rain filtering device for water inlet of direct drainage river |
| CN116425315A (en) * | 2023-05-25 | 2023-07-14 | 中交第三公路工程局有限公司 | Constructed wetland system based on electrodynamic strengthening denitrification |
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