CN111980138A - Sponge city initial rainwater collection system and collection method - Google Patents
Sponge city initial rainwater collection system and collection method Download PDFInfo
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- CN111980138A CN111980138A CN202010890947.XA CN202010890947A CN111980138A CN 111980138 A CN111980138 A CN 111980138A CN 202010890947 A CN202010890947 A CN 202010890947A CN 111980138 A CN111980138 A CN 111980138A
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- rainwater
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- E—FIXED CONSTRUCTIONS
- E03—WATER SUPPLY; SEWERAGE
- E03F—SEWERS; CESSPOOLS
- E03F5/00—Sewerage structures
- E03F5/10—Collecting-tanks; Equalising-tanks for regulating the run-off; Laying-up basins
- E03F5/101—Dedicated additional structures, interposed or parallel to the sewer system
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- E—FIXED CONSTRUCTIONS
- E03—WATER SUPPLY; SEWERAGE
- E03F—SEWERS; CESSPOOLS
- E03F3/00—Sewer pipe-line systems
- E03F3/02—Arrangement of sewer pipe-lines or pipe-line systems
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
- G01D21/00—Measuring or testing not otherwise provided for
- G01D21/02—Measuring two or more variables by means not covered by a single other subclass
-
- E—FIXED CONSTRUCTIONS
- E03—WATER SUPPLY; SEWERAGE
- E03F—SEWERS; CESSPOOLS
- E03F2201/00—Details, devices or methods not otherwise provided for
- E03F2201/10—Dividing the first rain flush out of the stormwater flow
-
- E—FIXED CONSTRUCTIONS
- E03—WATER SUPPLY; SEWERAGE
- E03F—SEWERS; CESSPOOLS
- E03F2201/00—Details, devices or methods not otherwise provided for
- E03F2201/20—Measuring flow in sewer systems
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- Engineering & Computer Science (AREA)
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Abstract
A sponge city initial stage rainwater collection system includes: the system comprises an initial rainwater collecting tank, a water collecting pipe, a municipal drainage pipeline and a sewage treatment pipeline; the water collecting pipe is communicated with the initial rainwater collecting tank and the municipal drainage pipeline through a first control valve and a second control valve respectively; a water quality detection device is arranged in the initial rainwater collecting tank and is used for detecting the concentration of pollutants; the flow sensor and the flow velocity sensor are used for detecting the rainwater runoff and the rainwater flow velocity; a controller for controlling the opening and closing of the first control valve and the second control valve according to the detection results of the water quality detection device, the flow sensor and the flow velocity sensor; therefore, the condition that the concentration difference of pollutants in the collecting area is large can be met, later-stage high-pollution rainwater can be collected, and the pollution of initial rainwater to the environment is reduced.
Description
Technical Field
The invention relates to the technical field of water supply and drainage, in particular to a sponge city initial rainwater collection system.
Background
The sponge city is a brand new mode, the ecological city and the low-carbon city are the foundation of the sponge city, and the sponge city is an image metaphor, which means that the city is rich in elasticity like a sponge and faces the change of the external environment, gradually adapts to the change of the external environment, can effectively deal with natural disasters such as rainstorm, drought and the like, repairs the water ecology of the city, and realizes multiple targets of water safety, water environment protection and the like. The main purpose of sponge city construction is to maintain harmony and unity of city development and natural environment. The sponge city realizes that the development of the city is unified with the protection of the natural ecological environment, and the effects of no water accumulation in light rain, no waterlogging in heavy rain, alleviation of heat island effect and no black and odorous water body are achieved by adopting a low-influence development means and comprehensively adopting measures of seepage, stagnation, storage, purification, use and discharge.
The initial rainwater is a certain part of rainwater at the initial stage of runoff formed in different catchment surfaces and pipe channels. The method is characterized in that the concentration of pollutants in initial rainwater is far higher than that of later runoff rainwater. At present, the construction of sponge cities in various cities is gradually promoted, and the treatment measures of initial rainwater play an important role in the construction of the sponge cities, and contribute to water quality and hydrology.
At present, the comparatively effectual initial stage rainwater collection mode is the collecting pit collection mode, the rationale of collecting pit: after the rainwater falls to the road surface, when ground produced the runoff, initial stage road rainwater runoff can get into the pipeline of connecting the collecting pit in, automatic switching over device valve can automatic switch to municipal rainwater pipeline behind the initial stage rainwater entering collecting pit of road, in later stage rainwater gets into the municipal pipeline. The initial rainwater of the road flowing into the collecting tank is treated by the sewage treatment system, and all indexes can be discharged after reaching the standard. Through the regulation effect of collecting pit, can collect the more serious rainwater of pollution of rainfall at the initial stage of road, adjust quality of water and water yield, can alleviate sewage treatment plant's pressure and load, simultaneously, the ecological purification effect of full play purifies the water.
When the rainwater discarding value of the initial rainwater collecting device is designed, the initial rainwater collecting amount of different areas of different cities is different, so that the rainwater collecting value of the initial rainwater collecting device is required to be adjustable. In the prior art, CN108487369A discloses an initial rainwater collection system, which generates a rainwater pollution degree curve according to rainwater runoff and rainwater pollutant concentration, and when the efficiency of the rainwater pollution degree curve is smaller than zero and the absolute value of the slope is greater than a threshold, it indicates that the pollutant concentration starts to decrease, and ends the initial rainwater collection, so as to adopt different initial rainwater collection amounts for different areas. However, the distribution of pollutants in the collection area of the initial rainwater collection pool is not uniform, if the near part of the collection area is an area with low pollutant concentration and the far part of the collection area is an area with high pollutant concentration, and a certain time is required for rainwater to flow into the collection pool, the situation that the pollutant concentration curve is increased again due to the arrival of far rainwater after the pollutant concentration curve of the near rainwater is detected to be reduced occurs; the high-pollution early rain at the later stage is not collected in the collecting tank, and the environment is polluted.
Disclosure of Invention
The invention provides a sponge city initial rainwater collecting system and a collecting method, which can be used for collecting high-pollution rainwater in the later period aiming at the condition that the concentration difference of pollutants in a collecting region is large.
As one aspect of the present invention, a sponge city initial rainwater collection system includes: the system comprises an initial rainwater collecting tank, a water collecting pipe, a municipal drainage pipeline and a sewage treatment pipeline; the water collecting pipe is communicated with the initial rainwater collecting tank and the municipal drainage pipeline through a first control valve and a second control valve respectively; the initial rainwater collecting tank is communicated with the sewage treatment pipeline through a third control valve; a water quality detection device is arranged in the initial rainwater collecting tank and is used for detecting the concentration of pollutants; the flow sensor is arranged on the water collecting pipe and used for detecting the runoff of the rainwater; a controller for controlling opening and closing of the first control valve and the second control valve based on detection results of the water quality detection device and the flow sensor; the water collecting pipe is also provided with a flow velocity sensor for detecting the flow velocity of the rainwater in the water collecting pipe; a storage unit for storing the farthest distance from the farthest end of the water collecting pipe to the initial rainwater collecting tank; a timer that starts timing when the flow sensor detects a rainwater runoff amount; the control part determines a first threshold time according to the maximum distance and the rainwater flow rate; the control part generates a runoff-pollutant curve according to detection results of the water quality detection device and the flow sensor, judges whether the timing time of the timer is greater than a first threshold time when the slope of the curve is negative and the absolute value is greater than a preset threshold, and closes the first control valve and opens the second control valve if the timing time is greater than the first threshold time; otherwise, after the timing time is greater than a second threshold time, closing the first control valve and opening the second control valve.
Preferably, the water quality detection device is a turbidity and/or conductivity sensor.
Preferably, the sponge city initial rainwater collection system is used for collecting initial rainwater in areas with large difference of pollutant concentration distribution areas.
Preferably, the far distance of the rainwater collection range of the initial rainwater collecting tank is closer to the pollution source.
Preferably, the near part in the rainwater collection range of the initial rainwater collecting pool is a green land, and the far part is a road.
Preferably, the first time threshold t1= S/v1, where S is a maximum distance from the farthest end of the water collecting pipe to the initial rainwater collecting pool, and v1 is an average value of the flow rate of rainwater at a period after the flow sensor of the water collecting pipe detects the runoff of rainwater.
Preferably, the period of time is 1 to 3 minutes.
Preferably, the second threshold time t2= t1+ t, where t1 is the first threshold time, t is a timing time when the slope of the runoff volume-pollutant curve is negative and the absolute value is greater than a preset threshold value.
Preferably, the controller opens the third control valve after the rainfall is finished to convey the initial rainwater of the initial rainwater collecting tank to the sewage treatment plant through the sewage treatment pipeline.
As another aspect of the present invention, there is provided a sponge city initial rainwater collection method of the sponge city initial rainwater collection system, including: (1) the farthest end of the water collecting pipe is the farthest distance from the initial rainwater collecting pool; (2) starting timing when the flow sensor detects the rainwater runoff; (3) detecting the rainwater flow rate of a water collecting pipe through a flow rate sensor, and determining first threshold time according to the maximum distance and the rainwater flow rate; (4) the detection results of the water quality detection device and the flow sensor generate a runoff-pollutant curve; (5) when the slope of the curve is negative and the absolute value is greater than a preset threshold, judging whether the timing time of the timer is greater than a first threshold time, if so, entering the step (6), otherwise, entering the step (7); (6) closing the first control valve and opening the second control valve; (7) and after the timing time is longer than a second threshold time, closing the first control valve and opening the second control valve.
Preferably, after the rainfall in the step (8) is finished, opening a third control valve to convey the initial rainwater in the initial rainwater collecting tank to a sewage treatment plant through a sewage treatment pipeline.
Preferably, in the step (3), the first time threshold t1= S/v1, where S is a farthest distance from the farthest end of the water collecting pipe to the initial rainwater collecting tank, and v1 is an average value of the flow rate of rainwater at a period after the flow sensor of the water collecting pipe detects the runoff of rainwater.
Preferably, in the step (5), if the counted time of the timer is not greater than the first threshold time, the counted time t of the time is recorded.
Preferably, in the step (7), the second threshold time t2= t1+ t.
Drawings
Fig. 1 is a schematic view of a sponge city initial rainwater collection system according to an embodiment of the invention.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are illustrative only for the purpose of explaining the present invention, and are not to be construed as limiting the present invention. Moreover, it is to be understood that the features of the various embodiments described herein are not mutually exclusive and can exist in a wide variety of combinations and permutations.
In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on those shown in the drawings, and are used only for convenience in describing the present invention and for simplicity in description, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
The sponge city initial rainwater collecting system provided by the embodiment of the invention is used for collecting initial rainwater with non-uniform pollutant distribution in the collecting area of the initial rainwater collecting pool, particularly an area with low pollutant concentration is close to the collecting area, an area with high pollutant concentration is far from the collecting area, for example, a green land is close to the collecting area, and a road is far away, or a pollution source such as an industrial chimney is far away.
Referring to fig. 1, the sponge city initial rainwater collection system includes: an initial rainwater collecting tank 10, a collecting pipe 20, a municipal drainage pipe 30, a sewage treatment pipe 40 and a controller. The initial rainwater collecting tank 10 is used for collecting initial rainwater, and is input to a sewage treatment plant through a sewage treatment pipeline 40 for purification treatment. The collecting pipe 20 is communicated with the initial rainwater collecting tank 10 and the municipal drainage pipe 30 through first and second control valves 21 and 22, respectively. The initial rainwater collecting tank 10 is communicated with the sewage treatment pipeline 40 through a third control valve 11.
The initial rainwater collecting tank 10 is provided with a water quality detection device 12 for detecting the concentration of pollutants. The water quality detection device 12 may be a turbidity and/or conductivity sensor. The water collecting pipe 20 is provided with a flow sensor 23 and a flow velocity sensor 24, wherein the flow sensor 23 is used for detecting the rainwater runoff of the water collecting pipe 20, and the flow velocity sensor 24 is used for detecting the rainwater flow velocity of the water collecting pipe 20.
And a storage part storing the farthest distance of the farthest end of the water collecting pipe 20 from the initial rainwater collecting tank 10. And a timer that starts counting when the flow sensor 23 detects the rainwater runoff amount. After the beginning of rainfall, the control part 50 determines the first time threshold t1= S/v1 according to the maximum distance S stored in the storage part and the average value v1 of the rainwater flow rate at a time after the flow sensor of the water collecting pipe detects the rainwater runoff, wherein the time period corresponding to the average value v1 of the rainwater flow rate may be 1-3 minutes. The control part 50 also generates a runoff volume-pollutant curve according to the detection results of the water quality detection device 12 and the flow sensor 23, judges whether the timing time of the timer is greater than a first threshold time when the slope of the runoff volume-pollutant curve is negative and the absolute value of the slope is greater than a preset threshold, and closes the first control valve 21 and opens the second control valve 22 when the timing time is greater than the first threshold time; otherwise, if the timing time is not greater than the first threshold time t1, it indicates that the most remote initial rainwater has not reached the water collecting tank, and there may be high-pollution initial rainwater, and after the timing time is greater than the second threshold time, the first control valve 21 is closed, and the second control valve 22 is opened; wherein the second threshold time t2= t1+ t, where t1 is the first threshold time, t is the timing time when the slope of the runoff volume-contamination curve is negative and the absolute value is greater than a preset threshold value.
After the rainfall is finished, the controller opens the third control valve 11 to convey the initial rainwater in the initial rainwater collecting tank 10 to a sewage treatment plant through the sewage treatment pipeline 40 for purification treatment.
The sponge city initial rainwater collection method of the sponge city initial rainwater collection system provided by the embodiment of the invention comprises the following steps: (1) the farthest distance from the farthest end of the storage water collecting pipe 20 to the initial rainwater collecting tank 10; (2) starting timing when the flow sensor 23 detects the rainwater runoff; (3) detecting the rainwater flow rate of the water collecting pipe 10 through a flow rate sensor 24, and determining a first threshold time according to the maximum distance and the rainwater flow rate; (4) generating a runoff-pollutant curve according to the detection results of the water quality detection device 12 and the flow sensor 23; (5) when the slope of the runoff-pollutant curve is negative and the absolute value is greater than a preset threshold, judging whether the timing time of the timer is greater than a first threshold time, if so, entering a step (6), otherwise, entering a step (7); (6) the first control valve 21 is closed and the second control valve 22 is opened; (7) after the timing time is longer than the second threshold time, closing the first control valve 21 and opening the second control valve 22; (8) after the rainfall is finished, the third control valve 11 is opened to deliver the initial rainwater of the initial rainwater collecting tank 10 to the sewage treatment plant through the sewage treatment pipeline 40.
The above embodiments are only for illustrating the technical solutions of the present invention and not for limiting the same, and although the present invention is described in detail with reference to the above embodiments, those of ordinary skill in the art should understand that: modifications and equivalents may be made to the embodiments of the invention without departing from the spirit and scope of the invention, which is to be covered by the claims.
Claims (6)
1. A sponge city initial stage rainwater collection system includes: the system comprises an initial rainwater collecting tank, a water collecting pipe, a municipal drainage pipeline and a sewage treatment pipeline; the water collecting pipe is communicated with the initial rainwater collecting tank and the municipal drainage pipeline through a first control valve and a second control valve respectively; the initial rainwater collecting tank is communicated with the sewage treatment pipeline through a third control valve; a water quality detection device is arranged in the initial rainwater collecting tank and is used for detecting the concentration of pollutants; the flow sensor is arranged on the water collecting pipe and used for detecting the runoff of the rainwater; a controller for controlling opening and closing of the first control valve and the second control valve based on detection results of the water quality detection device and the flow sensor; the method is characterized in that: the water collecting pipe is also provided with a flow velocity sensor for detecting the flow velocity of the rainwater in the water collecting pipe; a storage unit for storing the farthest distance from the farthest end of the water collecting pipe to the initial rainwater collecting tank; a timer that starts timing when the flow sensor detects a rainwater runoff amount; the control part determines a first threshold time according to the maximum distance and the rainwater flow rate; the control part generates a runoff-pollutant curve according to detection results of the water quality detection device and the flow sensor, judges whether the timing time of the timer is greater than a first threshold time when the slope of the curve is negative and the absolute value is greater than a preset threshold, and closes the first control valve and opens the second control valve if the timing time is greater than the first threshold time; otherwise, after the timing time is greater than a second threshold time, closing the first control valve and opening the second control valve.
2. The sponge city initial rainwater collection system of claim 1, wherein: the water quality detection device is a turbidity and/or conductivity sensor.
3. The sponge city initial rainwater collection system of claim 1, wherein: the sponge city initial rainwater collection system is used for collecting initial rainwater in areas with large difference of pollutant concentration distribution areas.
4. The sponge city initial rainwater collection system of claim 1, wherein: and after the rainfall is finished, the controller opens the third control valve to convey the initial rainwater of the initial rainwater collecting tank to a sewage treatment plant through a sewage treatment pipeline.
5. The sponge city initial rainwater collection method of the sponge city initial rainwater collection system of claim 1, comprising: (1) storing the farthest distance between the farthest end of the water collecting pipe and the initial rainwater collecting pool; (2) starting timing when the flow sensor detects the rainwater runoff; (3) detecting the rainwater flow rate of a water collecting pipe through a flow rate sensor, and determining first threshold time according to the maximum distance and the rainwater flow rate; (4) the detection results of the water quality detection device and the flow sensor generate a runoff-pollutant curve; (5) when the slope of the curve is negative and the absolute value is greater than a preset threshold, judging whether the timing time of the timer is greater than a first threshold time, if so, entering the step (6), otherwise, entering the step (7); (6) closing the first control valve and opening the second control valve; (7) and after the timing time is longer than a second threshold time, closing the first control valve and opening the second control valve.
6. The sponge urban rainwater collection method according to claim 5, characterized in that: and (8) after the rainfall is finished, opening a third control valve to convey the initial rainwater of the initial rainwater collecting tank to a sewage treatment plant through a sewage treatment pipeline.
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| CN202010890947.XA CN111980138A (en) | 2020-08-29 | 2020-08-29 | Sponge city initial rainwater collection system and collection method |
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| CN202010890947.XA CN111980138A (en) | 2020-08-29 | 2020-08-29 | Sponge city initial rainwater collection system and collection method |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112360072A (en) * | 2020-12-04 | 2021-02-12 | 中国市政工程华北设计研究总院有限公司 | Sponge city green infrastructure soil and water salinity regulation and control system and regulation and control method |
| CN113615563A (en) * | 2021-08-19 | 2021-11-09 | 江苏浴普环境科技有限公司 | Urban rainwater collection, diversion and irrigation system |
| CN114263238A (en) * | 2021-11-17 | 2022-04-01 | 贵州公路集团第九工程有限公司 | Reservoir capable of being automatically opened and closed according to pollution degree |
| CN115057537A (en) * | 2022-05-23 | 2022-09-16 | 无锡市瑞景城市服务有限公司 | Water treatment method for municipal drainage pipe network |
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| CN115057537A (en) * | 2022-05-23 | 2022-09-16 | 无锡市瑞景城市服务有限公司 | Water treatment method for municipal drainage pipe network |
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