CN111287296A - Method and device for intelligent operation of rainwater storage tank - Google Patents

Method and device for intelligent operation of rainwater storage tank Download PDF

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Publication number
CN111287296A
CN111287296A CN202010154384.8A CN202010154384A CN111287296A CN 111287296 A CN111287296 A CN 111287296A CN 202010154384 A CN202010154384 A CN 202010154384A CN 111287296 A CN111287296 A CN 111287296A
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water
storage tank
tss
water inlet
rainwater
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叶建锋
陈浩
丁国平
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叶建锋
陈浩
丁国平
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    • EFIXED CONSTRUCTIONS
    • E03WATER SUPPLY; SEWERAGE
    • E03FSEWERS; CESSPOOLS
    • E03F1/00Methods, systems, or installations for draining-off sewage or storm water
    • EFIXED CONSTRUCTIONS
    • E03WATER SUPPLY; SEWERAGE
    • E03FSEWERS; CESSPOOLS
    • E03F5/00Sewerage structures
    • E03F5/10Collecting-tanks; Equalising-tanks for regulating the run-off; Laying-up basins
    • EFIXED CONSTRUCTIONS
    • E03WATER SUPPLY; SEWERAGE
    • E03FSEWERS; CESSPOOLS
    • E03F5/00Sewerage structures
    • E03F5/10Collecting-tanks; Equalising-tanks for regulating the run-off; Laying-up basins
    • E03F5/105Accessories, e.g. flow regulators or cleaning devices
    • E03F5/107Active flow control devices, i.e. moving during flow regulation
    • EFIXED CONSTRUCTIONS
    • E03WATER SUPPLY; SEWERAGE
    • E03FSEWERS; CESSPOOLS
    • E03F5/00Sewerage structures
    • E03F5/22Adaptations of pumping plants for lifting sewage
    • EFIXED CONSTRUCTIONS
    • E03WATER SUPPLY; SEWERAGE
    • E03FSEWERS; CESSPOOLS
    • E03F2201/00Details, devices or methods not otherwise provided for
    • E03F2201/10Dividing the first rain flush out of the stormwater flow
    • EFIXED CONSTRUCTIONS
    • E03WATER SUPPLY; SEWERAGE
    • E03FSEWERS; CESSPOOLS
    • E03F2201/00Details, devices or methods not otherwise provided for
    • E03F2201/20Measuring flow in sewer systems
    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02ATECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
    • Y02A10/00TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE at coastal zones; at river basins
    • Y02A10/30Flood prevention; Flood or storm water management, e.g. using flood barriers

Abstract

The invention belongs to the municipal field, and particularly relates to a method and a device for intelligent operation of a rainwater storage tank. The intellectualization of the regulation and storage pool provided by the invention is realized by monitoring a certain index of the initial rainwater of a pipe network on line, and the TSS (total suspended solids) water quality index can be screened out to represent the initial rainwater mainly through the correlation coefficient of the concentration of each pollutant in the initial rainwater. The system and device of the invention comprises: TSS on-line detector, electric valve, Doppler flow acoustic flowmeter. After the TSS on-line detector monitors the change trend of the TSS concentration peak in the initial rainwater, the electric gate is automatically opened, and the real-time dynamic balance of the inflow water and the water volume of the tank body is maintained. This system and device can directly discern the initial stage rainwater that has the scouring effect to automatically, bring the initial stage rainwater into and avoided the lower later stage rainwater of pollution load to get into the regulation pond, very big reduction take place overflow pollution's possibility, realized the intellectuality of regulation pond.

Description

Method and device for intelligent operation of rainwater storage tank
Technical Field
The invention belongs to the municipal field, and particularly relates to a method and a device for intelligent operation of a rainwater storage tank.
Background
Research proves that the initial rainwater has higher pollutant load and is a main source of non-point source pollution. The initial rain itself flushes the ground, entrapping a number of residual organic contaminants, and also disturbing the black mud deposited in the pipes. If the river course is not managed and directly discharged into the river course, the river course can cause blackness, give off stink and damage the sensory effect of the river course, and pollutants of the river course can damage the growth of animals and plants in the river course, so that the water environment of the river course is seriously damaged. Therefore, the initial rainwater must be managed and controlled to avoid the damage to the ecological environment such as the river channel.
Although the existing part of urban rainwater pipe network system is also considered to be provided with a sewage interception function during construction, the interception multiple is increased so as to intercept the initial rainwater of the front part, but the initial rainwater has the characteristics of short duration and large instantaneous flow and can not be intercepted by a sewage interception facility base in a drought period basically, so that a large amount of overflow pollution can be still caused.
The rainwater storage tank is an effective means for controlling pollution and regulating water quantity in a drainage system. The rainwater storage tank is originally used for storing excess rainwater. In actual engineering now, rainwater regulation pond can play the effect of holding back the sediment. The initial rainwater is intercepted, self-purified within a certain time or conveyed to a town sewage treatment plant for centralized treatment, and the discharge of pollutants is controlled, so that the pollution is reduced. However, currently, the operation of most rainwater regulation and storage tanks in China is only controlled by workers coarsely, so that initial rainwater cannot be recognized accurately, and the scale of inflow and outflow water cannot be adjusted effectively, so that the regulation and storage tanks are difficult to exert application effect on overflow pollution control.
Aiming at avoiding overflow pollution caused by initial rainwater and improving the operation benefit of the rainwater storage tank, at present, some patents also exist for the management of the initial rainwater of the storage tank, such as methods for collecting, shunting, peak clipping and ecologically purifying the initial rainwater (application number: CN 201010277742.0), and the shunting of the initial rainwater is carried out according to the water level of the initial rainwater in the storage tank; in addition, as the initial rainwater separation method (application No. CN 201410059679.1), the time is counted until the ground runoff reaches X mm after the rainfall runoff is formed, the time duration of the initial rainwater is judged, and the rainwater in the pipe flow within the time duration is separated as the initial rainwater. The existing methods for managing and controlling initial rainwater are all general and belong to empirical methods. In the case of a rainwater pipe network system with complicated transverse and longitudinal directions in each region, different factors such as pipe length and pipe network dredging conditions in each region need to be considered, and the capacity of the storage pond is adjusted, so that the system is not suitable for comprehensive popularization.
Importantly, the current construction of storage tanks is not linked to the pollution load in the sewer. The construction volume of the rainwater storage tank is the maximum volume quantity established according to a series of factors such as the annual precipitation quantity, surface runoff, the capacity of a rainwater pump station and the like in the area. This accommodates not only initial rainwater but also most of late stage rainwater. However, later stage rainwater is often polluted at a lower concentration and can be directly discharged into a river channel. During the rainy season, the regulation and storage tank can close the water inlet of the regulation and storage tank due to the lack of time for emptying, so that pollutants in the rainwater in the initial stage later overflow from the intercepting well and are discharged into the river channel to form overflow pollution. The regulation and storage tank valve is controlled manually and roughly, and the initial rainwater can be judged only by the time after the switch is opened, even the judgment standard is not always available.
The key of the problem is that the early-stage rainwater pollution amount and the change trend are monitored in real time and automatically identified, namely the early-stage rainwater critical point and the later-stage rainwater critical point are established, and real-time dynamic balance of inflow water and the volume water of the pool body is established, so that the intelligent operation of the rainwater storage pool is realized. Therefore, the invention realizes the technical breakthrough development on the basis of the operation and maintenance of the existing regulation pool, so that the purposes of intelligently identifying the initial rainwater and automatically opening and closing the gate of the regulation pool can be achieved, and the overflow pollution is effectively reduced.
Disclosure of Invention
The invention aims to provide a method and a device for intelligent operation of a rainwater storage tank.
The invention judges the water quality condition of initial rainwater by monitoring a certain pollution index on line, automatically switches on and off a gate to enable the initial rainwater to enter a regulation and storage tank, and monitors and maintains the real-time dynamic balance of water inflow and the volume of the tank body in real time so as to avoid the overflow condition.
The sewage discharged into the system in fine days is less (mainly road surface washing water, car washing water and the like), the inlet gate of the rainwater pump room is closed at the moment, and the water quantity is less, so that pollutants such as pipeline bottom mud and the like cannot be disturbed and washed, so that the initial washing effect does not exist, the TSS online detector does not have large fluctuation, so that the inlet gate of the regulation and storage tank is closed, the intercepting sewage pump is opened, and the inlet water is lifted by the intercepting sewage pump in the pump chamber and then discharged into the corresponding sewage pipeline system.
The invention provides a method for intelligent operation of a rainwater storage tank, which comprises the following specific steps:
(1) according to water level control, a rainwater pump of a pump station is started, so that initial rainwater is converged into a combined pipeline, and pollutants such as bottom mud in the pipeline are disturbed;
(2) the TSS online detector positioned in the water inlet pipe of the storage tank judges whether the TSS concentration in the water quality meets the requirement of set peak value change, namely whether the initial rainwater with the initial scouring effect exists or not;
(3) if the TSS on-line monitor judges that the water quality index meets the set peak value change requirement in the step (2), the water inlet valve of the regulating reservoir is automatically opened, and the water outlet gate of the regulating reservoir is automatically closed; if the TSS online detector detects and judges that the requirements are not met, rainwater of the TSS online detector is intercepted through the intercepting well and waits to flow into the river channel;
(4) when the TSS online detector in the step (3) judges that the regulation pool meets the switching-off requirement, the water inlet flow meter at the water inlet of the regulation pool can monitor the water inlet flow online and enable the water inlet flow meter to monitor the water inlet flow onlineThe data is input into the controller, and the maximum value of the regulating storage pool which can be input into t can be judged in real timeλmin, and Vλm3
(5) On the basis of the step (4), opening the inlet valve of the storage tank to collect water at the t th timeτmin(tτ<tλ) When the water level in the storage tank does not reach the set water level, the TSS online detector positioned in the water inlet pipe of the storage tank judges that the TSS concentration is reduced to the set gradual change trend requirement, the water inlet gate of the storage tank is automatically closed, and the water outlet gate of the storage tank is automatically opened;
(6) on the basis of the step (4), opening a water inlet valve to collect water at the t th timeτmin(tτ=tλ) At this time, no matter how the TSS concentration in the inlet water is, the inlet valve of the regulating reservoir is immediately closed, and simultaneously, the outlet gate of the regulating reservoir is opened and is lowered to the set water level VIs effective90% (i.e. V)Is effective') can be repeated starting from step (2);
(7) on the basis of the step (4), opening a water inlet valve to collect water at the t th timeτmin(tτ>tλ) In the process, if the sewage pipeline system is maintained or fails, the water inlet valve of the storage tank can be manually closed, the water outlet gate of the storage tank is opened, and the safety overflow hole of the storage tank is opened.
In the invention, the TSS on-line monitor selects the water quality index of the water inlet pipe of the storage tank and judges whether the water quality index can represent initial rainwater according to pollutants: COD, BOD, SS, TN, TP, NH4 +The concentration dependence between N, and determined by current monitoring techniques, is selected as follows:
(1) in the water quality index, TN-TP and TN-NH with better linear correlation generally exist4 +-N, their Pearson correlation coefficient is between 0.751 and 0.805;
(2) the Pearson correlation coefficient between COD-SS and COD-BOD is above 0.800, which shows that the correlation between the COD-SS and the COD-BOD is better, and the correlation degree belongs to high correlation;
(3)SS-BOD、 SS-TP、 SS-TN、 COD-TP、 COD-TN、 COD-NH4 +and the correlation between-N is also better, and the Pearson correlation coefficients are all between 0.550 and 0.805.
The invention screens out the detection index which takes TSS as the main detection index by detecting the initial rainwater quality causing the initial scouring effect in rainy days, and judges the pipe flow condition with the initial scouring effect through the concentration change of TSS. Considerable pollutants are attached to the initial rainwater particles, and other pollutants are removed by removing the particulate pollutants, so that the pollution caused by overflowing in rainy days is reduced.
In the invention, the water inlet and the water volume of the tank body of the regulation and storage tank need to be maintained in real time and dynamic balance, and the water volume is regulated according to the safe water level volume V of the regulation and storage tankIs effectiveWater inflow qIntoWater flow qGo outAnd the volume V of the original water before the switch-off of the storage tank0The calculation formula is as follows:
Figure 287167DEST_PATH_IMAGE001
wherein, VτAfter the regulation pool is openedτmin, the volume of instantaneous water entering the storage tank;
β -safety value, since closing the gate is a process in which the amount of entering water is not negligible.
When V isAir conditionerWhen =0, τ = λ is t after the regulation and storage tank is openedλWithin min, no residual effective capacity exists in the regulating and storing tank.
In the invention, whether the TSS concentration meets the requirement of set peak value change and whether the TSS concentration is reduced to the requirement of set gentle change trend is judged according to the trend chart drawn by the concentration which is monitored and fed back by the TSS on-line monitor in real time in the water inlet pipe of the storage tank, so that the error of misjudgment of the system caused by water flow fluctuation in a pipe network system can be effectively avoided. The judgment process is as follows (see fig. 3):
(1) when a certain event occurs, the TSS on-line monitor starts to monitor the large-amplitude change of the TSS concentration, and the time is t0
(2) On the basis of the process (1), when the change trend d η/dt is continuously monitored to be more than or equal to 1 and more than 3 times, the TSS online monitor discrimination system judges that the TSS online monitor discrimination system has an initial scouring effect, the regulating reservoir water inlet gate is automatically opened at the moment, and the regulating reservoir water outlet gate is automatically closed;
(3) if the system judges that the regulation and storage tank is fed with the current water inlet flow rate for tau min and cannot reach the set water level (namely t)τ<tλIn the meantime), on the basis of the step (2), the TSS on-line monitor detects that the TSS concentration is η before the inlet gate of the storage tank is opened0±10%η0mg/L, and the continuous change trend d η/dt is more than or equal to-0.4 and more than 5 times, at the t thτClosing the water inlet gate of the storage tank and opening the water outlet gate of the storage tank;
(4) if the TSS online monitor discrimination system judges that the regulating storage tank enters water for tau min at the current water inlet flow, the water level can reach or exceed the set water level (namely t)τ≥ tλIn the meantime), the TSS online monitor discrimination system ignores the TSS concentration change, closes the inlet gate of the storage tank at the Tth min, opens the outlet gate of the storage tank, and drops to the set water level VIs effective90% (i.e. V)Is effective') a second event may be performed.
The invention provides a device for an intelligent operation method of a rainwater storage tank, which comprises a catch basin water inlet pipe, a catch basin, a storage tank water inlet pipe, a TSS online detector, a storage tank, a water inlet flowmeter and a water outlet flowmeter, wherein: one side of the intercepting well is connected with one end of a water inlet pipe of the intercepting well, the other side of the intercepting well is connected with one end of a water inlet pipe of the regulating and storing pool, the effluent on the intercepting well flows to a sewage plant and overflows to a river channel, the other end of the water inlet pipe of the regulating and storing pool is connected with a water inlet gate of the regulating and storing pool, a TSS (time shift system) online detector is arranged on the water inlet pipe of the regulating and storing pool, an acoustic flowmeter is arranged at the upper part of the regulating and storing pool to monitor the water level of the regulating and storing pool, a water inlet flowmeter is arranged at the water inlet gate of the regulating and storing; the other end of the intercepting well water inlet pipe is connected with a rainwater pump, and the TSS online detector is connected with a TSS online monitor discrimination system.
In the invention, the TSS online detector distinguishing system is composed of a TSS online monitor sensor, a timer, a water inlet acoustic flowmeter counter, a water outlet acoustic flowmeter counter, a storage outlet acoustic flow counter and a processor, wherein: the TSS on-line monitor sensor is positioned on the TSS on-line detector, the output end of the TSS on-line monitor sensor is connected with the input end of a timer, the timer is divided into a water inlet acoustic flow counter and a water outlet acoustic flow meter counter, the output ends of the water inlet acoustic flow counter and the water outlet acoustic flow meter counter are connected with a storage tank acoustic flow meter counter, and the output end of the storage tank acoustic flow meter counter is connected with a processor; the water inlet acoustic flow counter is connected with the water inlet flow meter, and the water outlet acoustic flow counter is connected with the water outlet flow meter.
In the invention, the water inlet flowmeter and the water outlet flowmeter both adopt Doppler acoustic flowmeters, and at least 3 flow meters are required to be installed; the flow velocity measurement adopts the ultrasonic Doppler principle. The Doppler acoustic flowmeter transmits two ultrasonic waves in the horizontal direction, the ultrasonic waves are reflected when encountering particles in water, and a certain offset exists between the frequency F2 of the reflected waves and the frequency F1 of original sound waves, and the offset is related to the relative speed between a sound source and the particles. The movement velocity of the reflecting particles can be obtained by utilizing the measured reflected wave frequency and the measured emitted wave frequency, and then the movement velocities of a large number of particles are combined to calculate the flow velocity of the water flow. The measurement range was. + -. 10 m/s. The water level measurement depends on a built-in ultrasonic sensor, an instrument is provided with a vertical upward ultrasonic probe to transmit ultrasonic waves to the water surface, and the height of the water surface is calculated by utilizing the time difference between the transmission and the reception of the ultrasonic waves. In order to avoid the influence of water surface fluctuation, water surface floaters and the like, the pressure sensor is arranged in the instrument and used for depth checking. The water level measurement is only effective when the difference between the water level measured by the ultrasonic probe and the water level measured by the pressure probe is within a certain range. Therefore, the accurate position of the actual water surface is determined as the basis for flow calculation. The water level range of the ultrasonic wave is 0.15-10 m.
According to the invention, the TSS online detector adopts a sewage treatment plant suspended matter (SS) online monitor sensor based on a combined infrared absorption scattered light method, infrared light emitted by a light source is scattered by suspended particles in a sample, and is finally converted into an electric signal by a photoelectric detector, and the suspended matter concentration of the sample is obtained after analog and digital signal processing. Which uses a cable and is equipped with a battery compartment in order to be able to work independently in special situations. In addition, an automatic flushing cleaning mode is also provided, and the SS concentration under non-initial rain flushing is automatically flushed and corrected during drought flow.
When the flow velocity of the water inlet pipe of the storage tank is less than 3m/s, the water inlet pipe of the storage tank can be directly and fixedly installed in the water inlet pipe of the storage tank; when the flow velocity of the water inlet pipe of the storage tank is more than 3m/s, a drainage pipe can be arranged in the water inlet pipe of the storage tank to slow down the flow velocity of the water inlet pipe of the storage tank, so that the measurement is convenient. The measuring range is 0.01-45000 mg/L.
The invention has the beneficial effects that: this TSS on-line monitoring appearance discrimination system and device can directly discern the initial stage rainwater that has the scouring effect to automatically bring the initial stage rainwater into and avoided the lower later stage rainwater of pollution load to get into the regulation pond and avoided discerning the initial stage rainwater through the empirical method, very big reduction take place overflow pollution's possibility, realized the intellectuality in regulation pond.
Drawings
Fig. 1 is a simple construction diagram of an initial rainwater storage tank.
FIG. 2 is a structural diagram of a TSS on-line monitor discrimination system.
FIG. 3 is a flow chart of the operation of the TSS on-line monitor discrimination system.
Reference numbers in the figures: 1 vatch basin inlet tube, 2 vatch basins, 3 play water to the sewage plant, 4 overflows to the river course, 5 regulation pond inlet tubes, 6 TSS on-line detector, 7 regulation pond, 8 regulation pond inlet sluices, 9 inlet flowmeters, 10 regulation pond water level acoustic flowmeters, 11 outlet flowmeters, 12 regulation pond outlet sluices, 13 outlet water to the sewage plant, 14TSS on-line monitor sensor, 15 timers, 16 inlet acoustic flowmeter counters, 17 outlet acoustic flowmeter counters, 18 regulation outlet acoustic flow counters, 19 processors.
Detailed Description
The invention is further described below by way of examples. It should be understood that these examples are for illustrative purposes only and are not intended to limit the scope of the present invention. Further, it should be understood that various changes or modifications of the present invention may be made by those skilled in the art after reading the teaching of the present invention, and such equivalents may fall within the scope of the present invention as defined in the appended claims.
Example 1: central urban area regulation pool A
Based on the existing construction of the central urban regulation pool A, the central urban regulation pool A is reconstructed according to the diagram 1. One side 2 of the intercepting well is connected with one end of an intercepting well water inlet pipe 1, the other side of the intercepting well is connected with one end of a regulating reservoir water inlet pipe 5, water discharged from the intercepting well 2 flows to a sewage plant 3 and overflows to a river channel 4, the other end of the regulating reservoir water inlet pipe 5 is connected with a regulating reservoir water inlet gate 8 on one side of a regulating reservoir 7, a TSS online detector 6 is arranged on a pipeline connecting the regulating reservoir water inlet pipe 5 and the regulating reservoir, a regulating reservoir acoustic flowmeter 10 is arranged at the upper part of the regulating reservoir 7 to monitor the water level, a water inlet flowmeter 9 is arranged at the regulating reservoir water inlet gate 8 of the regulating reservoir 7, a regulating reservoir water outlet gate 12 is arranged at the other side of the regulating reservoir 7, and a water outlet flowmeter 11 is arranged at the regulating reservoir water outlet gate 12 of the regulating reservoir; the other end of the intercepting well water inlet pipe 1 is connected with a rainwater pump, and the TSS online detector is connected with a TSS online monitor discrimination system. The TSS online detector distinguishing system is composed of a TSS online monitor sensor, a timer, an inlet water acoustic flow meter counter, an outlet water acoustic flow meter counter, an adjusting outlet acoustic flow counter and a processor, and is shown in figure 2.
The area of the drainage system is 306ha, and the runoff coefficient is 0.8. The storage tank volume is calculated according to the german ATV a 128 standard:
Figure 328941DEST_PATH_IMAGE002
wherein, V-the volume m of the storage tank3
VSR-the area per hectare needs to regulate and store small amount of rainwater, is related to the pipeline fashion time, and can generally take 20
A- -non-permeable area
AU-drainage system service area runoff coefficient
Therefore, the effective volume of the central urban regulation pool 1 is: vIs effective=1.5*306*0.8*20=7344≈7400 m3
VIs effective’=7400*90%=6600 m3,VPractice of=8300 m3
The central urban area storage pond A is a circular reinforced concrete underground structure with an inner diameter of 40 m and a total pond volume of 8300 m3Effective storage volume 7400 m3The water depth of the side of the pool is 5.0 m, the water depth in the pool is 7.50 m, a pump pit with the diameter of phi 4 m is arranged in the pool, the pump pit depth is 2m, the elevation of the bottom plate of the storage pool is minus 4.40 to minus 6.90 m, and the pump pit is pumped in a slope of 1: 7.2. The safe water level is set to be 0.6m in the storage tank.
Two rainwater pumps are arranged for water inlet of the storage tank, and the flow rate is 4.1 m3Flow rate of 2.4 m/s3And/s, the diameter of the water inlet pipe is DN1600, the length of the water inlet pipe is 100 m, and the elevation of the bottom of the water inlet pipe is minus 2.00 m. The TSS online detector is arranged at a position 50m away from the water inlet pipe orifice, and the inflow velocity is less than 3m3And/s, so the TSS online detector does not need to be provided with a drainage tube. The water outlet pipe is a DN1000 steel pipe with the length of 65.1 m, the pipe bottom elevation is minus 4.40 to minus 4.55 m, and the maximum flow is 4.75 m3/s 。
Because of the central urban area regulation pond A utilizes the mode that gravity unloading and emptying pump combine to empty the regulation and storage sewage, so need install 4 Doppler acoustic flowmeters, be located regulation pond inlet pipe mouth, regulation pond top, gravity unloading outlet pipe mouth and emptying pump outlet pipe mouth respectively to this comes available residual capacity in real-time monitoring and prejudges feedback regulation and storage pond.
The operation mode is as follows:
(1) a sunny mode: the rainwater pumping station closes the floodgate, and the sewage water speed in the confluence control pipe network is mild, can not arouse initial scouring effect, and the online detector of TSS judges for non-initial stage rainwater, consequently does not use the regulation pond, closes the butterfly valve that intakes, opens out the butterfly valve of water. Sewage in the pipe network enters a catch basin and is then conveyed to a sewage treatment plant;
(2) and (3) a rainy day water inlet mode: after a pump station is switched on, when the TSS online detector judges that the water quality index meets the set peak value change requirement, an inlet valve of a regulating storage tank is automatically opened, an outlet valve is automatically closed, and 1 rainwater pump is started; and when the water collecting well reaches-5.00 m and the TSS concentration still meets the requirement of set peak value change, starting the 2 nd rainwater pump and conveying the initial rainwater to the regulation and storage tank. In regulating storage pool prejudgementOn the premise that the residual capacity is still available, until the TSS on-line monitor detects that the TSS concentration is η before opening the brake0±10%η0mg/L, and when the continuous change trend d η/dt is more than or equal to-0.4 and more than 5 times, the water inlet valve of the regulating reservoir is automatically closed;
(3) the full pool mode: when the liquid level in the regulating storage tank reaches the designed highest liquid level, namely 0.6m (designed highest liquid level), no matter how the TSS concentration changes, the water inlet valve of the regulating storage tank is immediately closed, the water outlet butterfly valve is opened, and meanwhile, the pump station is informed to open the rainwater outlet gate and discharge the river channel. When the water level in the regulating storage tank is reduced to VIs effective' i.e. 6600 m3Then a second event may be performed;
(4) emptying mode: emptying by gravity, opening a water outlet butterfly valve, emptying until the liquid level of the storage tank reaches-3.90 m, and closing the water outlet butterfly valve; and (3) emptying the pump, when the liquid level of the storage tank reaches-3.90 m, starting 2 emptying water pumps until the liquid level of the storage tank is reduced to-7.90 m, closing the emptying pumps, completing emptying, and emptying for about 2.3 h when the tank is full.
Before the regulation and storage tank is not modified, the water inlet SS of the regulation and storage tank is 263-270 mg/L, the river drainage SS is 64.7-158 mg/L, and the TSS removal rate is about 40-70%, but after the regulation and storage tank is intelligentized by using the method, the TSS removal rate is about 60-85%.
Example 2: central urban regulation pool B
And (3) reconstructing the urban area according to the figure 1 on the basis of the existing construction of the central urban area regulation pool B.
Central urban area regulation pool B total volume VPractice of=18000 m3Effective regulation of volume VIs effective=15000 m3, VIs effective’=13500 m3The water level was set to-3 m.
The pipe diameter of the water inlet main pipe of the pump station is 3500mm, and the elevation of the inner bottom of the pipe is-5.60 m. The rainwater pump adopts 6 submersible mixed flow pumps, and the single pump Q =3.33m3And s. 2 submersible sewage pumps for emptying are arranged, a variable frequency pump is adopted, and the flow of a single pump is 0.35-1.01 m3/s。
The TSS online detector is arranged at a position 50m away from the water inlet pipe orifice, and the flow velocity is certain to be larger than 3m because the water storage amount is large and at least 3 rainwater pumps work simultaneously3S, so TSS is atThe line detector needs to be provided with a drainage tube.
Because of central city district regulation pond B utilizes the pump blowdown of emptying institute to regulate and store sewage, so need install 3 Doppler acoustic flowmeters, be located regulation pond inlet opening, regulation pond top and the pump blowdown outlet pipe mouth respectively to this comes real-time supervision to maintain the real-time dynamic balance of intaking and cell body volume water volume.
The operation mode is as follows:
(1) a sunny mode: the rainwater pumping station closes the floodgate, and the sewage water speed in the confluence control pipe network is mild, can not arouse initial scouring effect, and the online detector of TSS judges for non-initial stage rainwater, consequently does not use the regulation pond, closes the butterfly valve that intakes, opens out the butterfly valve of water. And the sewage in the pipe network enters the intercepting well and is then conveyed to a sewage treatment plant.
(2) And (3) a water inlet mode in rainy days, namely after a pump station is switched off, when the TSS online detector judges that the water quality index meets the requirement of set peak value change, a water inlet valve of the storage tank is automatically opened, a water outlet valve of the storage tank is automatically closed, 3 rainwater pumps are opened, when a water collecting well reaches-3.00 m and the TSS concentration still meets the requirement of set peak value change, 6 rainwater pumps are opened, initial rainwater is conveyed to the storage tank, and on the premise that the storage tank still has residual capacity, the TSS online monitor detects that the TSS concentration is η before switching off0±10%η0mg/L, and the continuous change trend d η/dt is more than or equal to-0.4 and more than 5 times, the water inlet valve of the regulating reservoir is automatically closed.
(3) The full pool mode: when the liquid level in the regulating storage tank reaches the designed highest liquid level, namely-3 m (the designed highest liquid level), no matter how the TSS concentration changes, the water inlet valve of the regulating storage tank is immediately closed, the water outlet butterfly valve is opened, and meanwhile, the pump station is informed to open the rainwater outlet gate to discharge the river channel. When the water level in the regulating storage tank is reduced to VIs effectiveI.e., 17100 m3, a second event may be performed.
After the intelligent regulation and storage pool B in the central urban area is realized by using the method, the TSS removal rate is about 60-85%.

Claims (10)

1. A method for intelligent operation of a rainwater storage tank is characterized by comprising the following specific steps:
(1) according to water level control, a rainwater pump of a pump station is started, so that initial rainwater is converged into a combined pipeline, and pollutants in the pipeline are disturbed;
(2) the TSS online detector positioned in the water inlet pipe of the storage tank judges whether the TSS concentration in the water quality meets the requirement of set peak value change, namely whether the initial rainwater with the initial scouring effect exists or not;
(3) if the TSS on-line monitor judges that the water quality index meets the set peak value change requirement in the step (2), the water inlet valve of the regulating reservoir is automatically opened, and the water outlet gate of the regulating reservoir is automatically closed; if the TSS online detector detects and judges that the requirements are not met, rainwater of the TSS online detector is intercepted through the intercepting well and waits to flow into the river channel;
(4) when the TSS online detector in the step (3) judges that the regulation pool meets the switching-off requirement, the water inlet flow meter at the water inlet of the regulation pool can monitor the water inlet flow online, and the data is converged into the controller to judge that the regulation pool can be converged into t at most in real timeλmin, and Vλm3
(5) On the basis of the step (4), opening the inlet valve of the storage tank to collect water at the t th timeτmin(tτ<tλ) When the water level in the storage tank does not reach the set water level, the TSS online detector positioned in the water inlet pipe of the storage tank judges that the TSS concentration is reduced to the set gradual change trend requirement, the water inlet gate of the storage tank is automatically closed, and the water outlet gate of the storage tank is automatically opened;
(6) on the basis of the step (4), opening a water inlet valve to collect water at the t th timeτmin(tτ=tλ) At this time, no matter how the TSS concentration in the inlet water is, the inlet valve of the regulating reservoir is immediately closed, and simultaneously, the outlet gate of the regulating reservoir is opened and is lowered to the set water level VIs effective90% (i.e. V)Is effective') can be repeated starting from step (2);
(7) on the basis of the step (4), opening a water inlet valve to collect water at the t th timeτmin(tτ>tλ) In time, if the sewage pipeline system is maintained or fails, the manual operation can be performedAnd (4) dynamically closing a water inlet valve of the storage tank, opening a water outlet gate of the storage tank, and opening a safety overflow hole of the storage tank.
2. The method of claim 1, wherein the TSS on-line monitor selects the water quality index of the inlet pipe of the storage tank and determines whether the index can represent the initial rainwater according to the following pollutants: COD, BOD, SS, TN, TP, NH4 +The concentration dependence between N, and determined by current monitoring techniques, is selected as follows:
(1) in the water quality index, TN-TP and TN-NH with better linear correlation generally exist4 +-N, their Pearson correlation coefficient is between 0.751 and 0.805;
(2) the Pearson correlation coefficient between COD-SS and COD-BOD is above 0.800, which shows that the correlation between the COD-SS and the COD-BOD is better, and the correlation degree belongs to high correlation;
(3)SS-BOD、 SS-TP、 SS-TN、 COD-TP、 COD-TN、 COD-NH4 +and the correlation between-N is also better, and the Pearson correlation coefficients are all between 0.550 and 0.805.
3. The method as claimed in claim 1, wherein the TSS is selected as a main detection index by detecting the initial rainwater quality causing the initial scouring effect in rainy days, and the pipe flow condition having the initial scouring effect is determined by the concentration change of the TSS.
4. Considerable pollutants are attached to the initial rainwater particles, and other pollutants are removed by removing the particulate pollutants, so that the pollution caused by overflowing in rainy days is reduced.
5. The method as claimed in claim 1, wherein the volume of the inlet water and the volume of the storage tank are dynamically balanced in real time according to the safety of the storage tankFull water level capacity VIs effectiveWater inflow qIntoWater flow qGo outAnd the volume V of the original water before the switch-off of the storage tank0The calculation formula is as follows:
Figure DEST_PATH_IMAGE002
wherein, VτAfter the regulation pool is openedτmin, the volume of instantaneous water entering the storage tank;
β -safety value, since closing the gate is a process in which the amount of entering water is not negligible;
when V isAir conditionerWhen =0, τ = λ is t after the regulation and storage tank is openedλWithin min, no residual effective capacity exists in the regulating and storing tank.
6. The method of claim 1, wherein the TSS concentration is judged to meet the requirement of peak value change and the TSS concentration is judged to be reduced to the requirement of gentle change according to a trend chart drawn by the concentration fed back by the TSS on-line monitor in the inlet pipe of the storage tank, so as to effectively avoid the error of water flow fluctuation in the pipe network system and cause the system to misjudge, and the judgment process is as follows:
(1) when a certain event occurs, the TSS on-line monitor starts to monitor the large-amplitude change of the TSS concentration, and the time is t0
(2) On the basis of the process (1), when the change trend d η/dt is continuously monitored to be more than or equal to 1 and more than 3 times, the TSS online monitor judging system judges that the TSS online monitor has an initial flushing effect, at the moment, the water inlet valve of the storage tank is automatically opened, and the water outlet valve of the storage tank is automatically closed;
(3) if the system judges that the regulation and storage tank is fed with the current water inlet flow rate for tau min and cannot reach the set water level (namely t)τ<tλIn the meantime), on the basis of the step (2), the TSS on-line monitor detects that the TSS concentration is η before the inlet gate of the storage tank is opened0±10%η0mg/L and its continuous variation trend d η/dt ≧0.4 over 5 times, at tτClosing the water inlet gate of the storage tank and opening the water outlet gate of the storage tank;
(4) if the TSS online monitor discrimination system judges that the regulating storage tank enters water for tau min at the current water inlet flow, the water level can reach or exceed the set water level (namely t)τ≥ tλIn the meantime), the TSS online monitor discrimination system ignores the TSS concentration change, closes the inlet gate of the storage tank at the Tth min, opens the outlet gate of the storage tank, and drops to the set water level VIs effective90% (i.e. V)Is effective') a second event may be performed.
7. The device for the intelligent operation of the rainwater storage tank according to claim 1 is characterized by consisting of a catch basin water inlet pipe, a catch basin, a storage tank water inlet pipe, a TSS online detector, a storage tank, a water inlet flowmeter and a water outlet flowmeter, wherein: one side of the intercepting well is connected with one end of a water inlet pipe of the intercepting well, the other side of the intercepting well is connected with one end of a water inlet pipe of the regulating and storing pool, the effluent on the intercepting well flows to a sewage plant and overflows to a river channel, the other end of the water inlet pipe of the regulating and storing pool is connected with a water inlet gate of the regulating and storing pool, a TSS (time shift system) online detector is arranged on the water inlet pipe of the regulating and storing pool, an acoustic flowmeter is arranged at the upper part of the regulating and storing pool to monitor the water level of the regulating and storing pool, a water inlet flowmeter is arranged at the water inlet gate of the regulating and storing; the other end of the intercepting well water inlet pipe is connected with a rainwater pump, and the TSS online detector is connected with a TSS online monitor discrimination system.
8. The apparatus of claim 6, wherein the TSS on-line detector determination system comprises a TSS on-line monitor sensor, a timer, an inlet acoustic flow meter counter, an outlet acoustic flow meter counter, and a processor, wherein: the TSS on-line monitor sensor is positioned on the TSS on-line detector, the output end of the TSS on-line monitor sensor is connected with the input end of a timer, the timer is divided into a water inlet acoustic flow counter and a water outlet acoustic flow meter counter, the output ends of the water inlet acoustic flow counter and the water outlet acoustic flow meter counter are connected with a storage tank acoustic flow meter counter, and the output end of the storage tank acoustic flow meter counter is connected with a processor; the water inlet acoustic flow counter is connected with the water inlet flow meter, and the water outlet acoustic flow counter is connected with the water outlet flow meter.
9. The device for intelligently operating the rainwater storage tank according to the claim 6 is characterized in that the water inlet flowmeter and the water outlet flowmeter are both Doppler acoustic flowmeters, and at least 3 devices are required to be installed; the flow velocity measurement adopts the ultrasonic Doppler principle; ultrasonic sensors are arranged in the water inlet flow meter and the water outlet flow meter, an ultrasonic probe vertically upwards is arranged on the ultrasonic sensor to transmit ultrasonic waves to the water surface, and the height of the water surface is calculated by utilizing the time difference between the transmission and the reception of the ultrasonic waves; in order to avoid the influence of water surface fluctuation, water surface floaters and the like, a pressure sensor is arranged in the instrument and is used for depth check; the water level measurement is effective only when the difference between the water level measured by the ultrasonic probe and the water level measured by the pressure probe is within a certain range; determining the accurate position of the actual water surface as the basis of flow calculation; the water level range of the ultrasonic wave is 0.15-10 m.
10. The device for the intelligent operation of the rainwater storage tank according to claim 6 is characterized in that the TSS online detector is a sewage treatment plant suspended matter (SS) online monitor sensor based on a combined infrared absorption scattering light method, infrared light emitted by a light source is scattered by suspended particles in a sample, and is finally converted into an electric signal by a photoelectric detector, and the concentration of suspended matters in the sample is obtained after analog and digital signal processing; the system uses cables and is provided with a battery box simultaneously to prevent the system from still independently working under special conditions, and is also provided with an automatic flushing cleaning mode to automatically flush and correct SS concentration under non-initial rainwater flushing during drought periods;
when the flow velocity of the water inlet pipe of the storage tank is less than 3m/s, the water inlet pipe of the storage tank can be directly and fixedly installed in the water inlet pipe of the storage tank; when the flow rate of the water inlet pipe of the storage tank is more than 3m/s, a drainage pipe can be arranged in the water inlet pipe of the storage tank to slow down the flow rate of the water inlet pipe of the storage tank so as to facilitate measurement, and the measurement range is 0.01-45000 mg/L.
CN202010154384.8A 2020-03-07 2020-03-07 Method and device for intelligent operation of rainwater storage tank Pending CN111287296A (en)

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CN111980138A (en) * 2020-08-29 2020-11-24 北京逸智联科技有限公司 Sponge city initial rainwater collection system and collection method
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