CN105256875A - Levee-type initial stage rainwater interception-storage-processing combined system - Google Patents

Abstract

An embankment-type primary rainwater interception-storage-treatment combined system, including an interception well connected to a municipal rainwater pipe arranged on a river embankment, an interception weir is arranged in the interception well, and the interception well is connected with a storage/sedimentation pipe, and the storage/sedimentation pipe is in the The bottom of the embankment is arranged along the length of the embankment, and the storage/sedimentation pipe is connected with a grit well and an inspection well, wherein the grit well is located between the interception well and the inspection well, and the grit well is connected with a system outlet pipe. Construction does not need to occupy ground space; compared with existing technologies, it can quickly and effectively collect and retain rainwater, and treat non-point source pollutants discharged into the river through rainfall runoff to reduce its pollution to river water quality.

Description

A bank-type initial rainwater interception-storage-treatment combined system

technical field

The invention belongs to the technical field of rainwater treatment, and in particular relates to a bank type initial rainwater interception-storage-treatment combined system.

Background technique

In recent years, with the continuous acceleration of urbanization in China, the initial runoff formed by rainfall contains a large amount of pollutants. During the falling process of urban rainwater, a certain concentration of dissolved gases, suspended solids and dissolved solids, organic matter, nitrogen, Phosphorus, heavy metals, bacteria and some pathogenic bacteria, among which SS, COD and BOD ₅ are the main pollutants in urban road surface runoff, and their average concentration is significantly higher than that of surface water environmental quality class V. The quality of runoff rainwater varies greatly. The pollution of road surface runoff in the initial stage accounts for an absolute amount in the total pollution, and the concentration gradually decreases in the later stage. The aggravation of urban ground pollution has led to more serious pollution of rainwater runoff. A large number of non-point source pollutants have continuously entered the water body through rainfall runoff, and urban non-point source pollution has become an important or even primary pollution source of surface water and groundwater.

Contents of the invention

In order to overcome the above-mentioned shortcoming of the prior art, the object of the present invention is to provide a bank-type initial rainwater interception-storage-treatment combination system, which can treat the non-point source pollutants discharged into the river through rainfall runoff, and reduce its impact on the river water quality. pollution.

In order to achieve the above object, the technical scheme adopted in the present invention is:

An embankment-type initial rainwater interception-storage-treatment combined system, including an interception well 1 connected to a municipal rainwater pipe 7 arranged on a river embankment, an interception well 1 is provided with an interception weir 2, an interception well 1 and a storage/sedimentation pipe 3 connected, the storage/sedimentation pipe 3 is arranged under the embankment along the length of the river embankment, the storage/sedimentation pipe 3 is connected with the sand settling well 4 and the inspection well 5, wherein the sand settling well 4 is located between the interception well 1 and the inspection well 5, The grit chamber 4 is connected with a system outlet pipe 6 .

The municipal rainwater pipe 7 is connected to the middle and upper part of the interception well 1, and the bottom of the interception well 1 is connected to the river channel through the rainwater outlet pipe 8, and the storage/sedimentation pipe 3 is arranged in the middle of the interception well 1, and is connected with the municipal rainwater pipe 7 and the rainwater outlet pipe. 8 are vertical in space.

The intercepting weir 2 is a rectangular intercepting weir plate, which is arranged at the mouth of the rainwater outlet pipe 8 .

The top height of the weir 2 is between the top height and the bottom height of the storage/sedimentation pipe 3 .

The height of the storage/sedimentation pipe 3 is higher than the bottom of the grit well 4, and the rainwater passes through the grit well 4 to realize sand sedimentation, and the system outlet pipe 6 is connected to the middle and upper part of the grit well 4.

The storage/sedimentation pipe 3 is divided into two sections, the first section is between the interception well 1 and the sand settlement well 4, the second section is between the sand settlement well 4 and the inspection well 5, and in the first section, along the interception well 1 to the direction of the sand sink 4, with a downward slope of 0.1% to 0.5%, so that the sediment flows from the interception well 1 to the sand sink 4 by its own weight; in the second section, along the inspection well 5 to the sand sink The direction of the well 4 has a downward slope of 0.1% to 0.5%, so that the sediment flows from the inspection well 5 to the sand settling well 4 by its own weight.

Compared with the prior art, the present invention can quickly and effectively collect and retain rainwater, and at the same time play a better role in sedimentation of non-point source pollutants carried by rainwater, and the system effluent can be directly discharged into rivers or connected to other infiltration The treatment device can effectively control the pollution caused by surface rainwater runoff to the river.

Description of drawings

Fig. 1 is a structural schematic view (top view) of the present invention.

Fig. 2 is a schematic diagram of the structure of the present invention (side view along the direction perpendicular to the river).

Fig. 3 is a plan view of the interception well of the present invention.

Fig. 4 is a sectional view of AA in Fig. 3 .

Fig. 5 is a sectional view of BB in Fig. 3 .

Fig. 6 is a longitudinal sectional view of the grit chamber of the present invention.

detailed description

The implementation of the present invention will be described in detail below in conjunction with the drawings and examples.

As shown in Fig. 1 and Fig. 2, an embankment type primary rainwater interception-storage-treatment combination system of the present invention includes an interception well 1 arranged on the embankment and communicated with the municipal rainwater pipe 7, and an interception weir is arranged in the interception well 1 2. The interception well 1 is connected with the storage/sedimentation pipe 3, and the storage/sedimentation pipe 3 is arranged under the embankment along the length direction of the embankment. The storage/sedimentation pipe 3 is connected with the sand sink 4 and the inspection well 5, of which the sand sink 4 Located between the interception well 1 and the inspection well 5, the grit chamber 4 is connected with a system outlet pipe 6. The system outlet pipe 6 can be connected to the river course, and can also be connected to other advanced treatment devices. In the figure, A is the river channel, B is the embankment, and C is the road along the river.

As shown in Figure 3, Figure 4 and Figure 5, the municipal rainwater pipe 7 is connected to the middle and upper part of the interception well 1, the bottom of the interception well 1 is connected to the river channel through the rainwater outlet pipe 8, and the storage/sedimentation pipe 3 is arranged in the middle of the interception well 1 The position is vertical to the municipal rainwater pipe 7 and the rainwater outlet pipe 8 in space. The interception weir 2 is a rectangular interception weir plate with a grid 9, which is arranged at the nozzle position of the rainwater outlet pipe 8, and its top height is between the top height and the bottom height of the storage/sedimentation pipe 3, that is, its height needs to meet (1) When it rains, a certain amount of rainwater storage is guaranteed. When the water level in the rainwater well is lower than the weir 2, the initial rainwater carrying non-point source pollutants in the area can be intercepted in the storage/sedimentation pipe 3; (2) Ensure that the storage/sedimentation pipe 3 is not full-flow to store rainwater, and the height of the weir 2 is slightly lower than or equal to the design height of the storage/sedimentation pipe 3 .

The sedimentation/storage pipe 3 is used to temporarily store rainwater, and has a sedimentation effect on the non-point source pollutants carried by the rainwater. The design diameter of the pipe needs to meet: (1) The pipe is a non-full flow design, with a fullness of about 70% to 90% , the actual rainfall storage capacity should ensure that the calculated amount of initial rainwater in the area can be temporarily stored; (2) The diameter of the pipe should not be too large, and the elevation of the bottom of the pipe should be higher than the water surface of the river to prevent backflow of river water; (3) The slope of the pipe is 0.1% to 0.5%, of which The second half is the reverse slope of the first half. That is, it can be divided into two sections, the first section is between the interception well 1 and the sand sink 4, and the second section is between the sand sink 4 and the inspection well 5. In the first section, along the direction of the interception well 1 The direction of the sand settling well 4 has a downward slope of 0.1% to 0.5%, so that the sediment flows from the interception well 1 to the sand settling well 4 by its own weight; in the second section, along the inspection well 5 to the sand settling well 4 direction, with a downward slope of 0.1% to 0.5%, so that the sediment flows from the inspection well 5 to the sand settling well 4 by its own weight.

As shown in Figure 2 and Figure 6, the grit chamber 4 is located in the middle of the storage/sedimentation pipe 3, and the height of the storage/sedimentation pipe 3 is higher than the bottom of the grit chamber 4. For sedimentation, the system outlet pipe 6 is connected to the middle and upper part of the grit chamber 4. The bottom of the grit chamber 4 is 0.5-0.7m deeper than the interception well 1 and the inspection well 5, which is beneficial for the sediment in the storage/sedimentation pipe 3 on both sides to flow into the grit chamber 4 along the slope without power for storage.

The system outlet pipe 6 communicates with the grit chamber 4, and the storage/sedimentation pipe 3 has a water accumulation capacity of 10% to 20%. It is equal to 10%-20% of the storage/precipitation pipe 3. The water outlet of the system outlet pipe 6 can directly enter the river, or be connected to other infiltration devices to achieve better water quality and then be discharged into the river.

The present invention can arrange intercepting main pipes parallel to the water body along the embankment of the river, and install intercepting wells 1 at appropriate positions of the intercepting main pipes, so that the part of mixed sewage exceeding the designed water delivery capacity of the intercepting main pipes can pass through the intercepting wells 1 smoothly. Discharge into the nearest water body (ie river).

The rainwater interception and non-point source pollutant treatment process and working principle of the present invention are as follows:

1) Initial rain interception steps: During the scheduled initial rain period, the rainwater collected by the municipal rainwater pipe 7 enters the interception well 1, and the rainwater that does not exceed the height of the interception weir 2 is intercepted and enters the storage/sedimentation pipe 3, and the excess part directly passes through the rainwater outlet pipe 8 into the river to achieve selective interception and high efficiency;

2) Primary rain treatment and discharge steps: the non-point source pollutants carried by the rainfall runoff settle in the storage/sedimentation pipe 3, and the treated rainwater enters the river channel or other advanced treatment devices in the sand settling well 4 through the system outlet pipe 6.

3) Sediment disposal: after the initial rain infiltrates into the river, the sediment will be deposited at the bottom of the storage/sedimentation pipe 3, the bottom of the grit chamber 4 and the bottom of the inspection well 5. The perforated pipe flushing technology is used to flush the storage/sedimentation pipe 3 in sections, and the sediment is flushed to the downstream inspection well 5 of each section. Finally, it will be sucked up and disposed of by a suction dredger.

The above content is a further detailed description of the present invention in conjunction with specific preferred embodiments, and it cannot be assumed that the specific implementation of the present invention is limited to these descriptions. For those skilled in the art to which the present invention belongs, several equivalent substitutions or obvious modifications can be made without departing from the concept of the present invention, and those with the same performance or use should be deemed to belong to the protection scope of the present invention.

Claims (6)

1. A kind of embankment type initial stage rainwater interception-storage-handling combined system is characterized in that, comprises the interception well (1) that is arranged on the embankment and communicates with municipal rainwater pipe (7), is provided with interception well (1) The weir (2), interception well (1) is connected with the storage/sedimentation pipe (3), the storage/sedimentation pipe (3) is arranged under the embankment along the length of the embankment, and the storage/sedimentation pipe (3) is connected with a sand chamber (4) and an inspection well (5), wherein the grit chamber (4) is located between the interception well (1) and the inspection well (5), and the grit chamber (4) is connected with a system outlet pipe (6). 2. According to claim 1, the embankment type initial rainwater interception-storage-processing combination system is characterized in that, the municipal rainwater pipe (7) is connected to the middle and upper part of the interception well (1), and the bottom of the interception well (1) passes through The rainwater outlet pipe (8) is connected to the river channel, and the storage/sedimentation pipe (3) is arranged in the middle of the interception well (1), vertical to the municipal rainwater pipe (7) and the rainwater outlet pipe (8) in space. 3. The embankment type initial rainwater interception-storage-processing combined system according to claim 2, characterized in that, the interception weir (2) is a rectangular interception weir plate, which is arranged at the nozzle position of the rainwater outlet pipe (8). 4. The embankment type initial rainwater interception-storage-processing combined system according to claim 3, characterized in that, the top height of the interception weir (2) is between the top height and the bottom height of the storage/sedimentation pipe (3) . 5. according to the said embankment type primary rainwater interception-storage-processing combined system of claim 1, it is characterized in that, the height of described storage/sedimentation pipe (3) is higher than the height of the bottom of grit well (4), and rainwater passes through The sedimentation of sand and gravel is realized behind the grit well (4), and the system water outlet pipe (6) is connected to the middle and upper part of the grit well (4). 6. According to claim 1, the embankment type initial rainwater interception-storage-treatment combination system is characterized in that, the storage/sedimentation pipe (3) is divided into two sections, the interception well (1) and the grit well (4) The first section is between the settling well (4) and the inspection well (5) and is the second section. In the first section, along the direction from the interception well (1) to the settling well (4), there is a downward 0.1% to 0.5% of the slope, so that the sediment flows from the interception well (1) to the settling well (4) by its own weight; in the second section, along the direction of the inspection well (5) to the settling well (4) , with a downward slope of 0.1% to 0.5%, so that the sediment flows from the inspection well (5) to the sand settling well (4) by its own weight.