CN111453852A - Intelligent regulation and control system and method for urban runoff rainwater wetland - Google Patents
Intelligent regulation and control system and method for urban runoff rainwater wetland Download PDFInfo
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- CN111453852A CN111453852A CN202010284714.5A CN202010284714A CN111453852A CN 111453852 A CN111453852 A CN 111453852A CN 202010284714 A CN202010284714 A CN 202010284714A CN 111453852 A CN111453852 A CN 111453852A
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/32—Biological treatment of water, waste water, or sewage characterised by the animals or plants used, e.g. algae
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/08—Chemical Oxygen Demand [COD]; Biological Oxygen Demand [BOD]
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2209/00—Controlling or monitoring parameters in water treatment
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Abstract
The invention relates to an urban runoff rainwater wetland intelligent regulation and control system and a method, wherein the intake water is mixed flow sewage possibly occurring in surface runoff and non-rainfall weather in catchment areas around a river channel; the intelligent regulation and control system comprises a closure unit, a wetland unit, a water inlet judgment unit, a water outlet judgment unit and an adjustment unit. The intercepting unit is used for intercepting the water inlet; the wetland unit carries out advanced treatment on the inlet water; the water inlet judging unit and the water outlet judging unit are used for providing a judging basis for the inlet and outlet water of the wetland unit; the adjusting unit is used for adjusting and matching the wetland unit under the conditions of different incoming water quality and quantity, and different outlet water quality and quantity; the invention provides a rainwater wetland intelligent regulation and control system for treating surface runoff and mixed flow sewage possibly appearing in non-rainfall weather, which can intelligently allocate the quality and quantity of water of different inlet and outlet water, and the formed method ensures that the system has higher use efficiency and is suitable for the periphery of river channels at junctions of cities, rural areas and cities.
Description
Technical Field
The invention relates to the technical field of artificial wetlands, in particular to an intelligent regulation and control system and method for urban runoff rainwater wetlands.
Background
The rapid development of urbanization makes the shared proportion of the impervious regional area in city more and more heavy, leads to the heavy rainfall weather condition of rainy day especially torrential rain, and a large amount of runoff passes through pipeline entering municipal sewage plant and city river course, and it is big to cause rainwater to accomodate pressure, if can not in time handle, arouses waterlogging easily.
In the rainfall process, rainwater also carries a large amount of pollutants, such as a large amount of acid gases in dissolved air, automobile exhaust, factory waste gas and other polluting gases, and pollutants brought by scouring of roofs, asphalt concrete roads and the like; the pollutants of the sewage are even beyond the pollution degree of common urban sewage. If the surface runoff is not treated and directly enters the urban river channel, the water supply environment is polluted to a certain degree. Especially, surface runoff formed in the early stage of rainfall (within 15 minutes) contains most pollutants of the rainfall, and if the surface runoff can be separated out, the important treatment can reduce the treatment burden of later-stage rainfall water bodies and can effectively protect the storage water bodies.
In the aspect of urban rainfall runoff treatment, the existing patent technology aims at improving the water quality of polluted water bodies more and takes removal of pollutants in the water bodies as a main research object; in the aspect of treating urban rainfall runoff by using the wetland, different wetland facilities are mainly researched, such as upgrading and reconstruction of a surface flow wetland and a vertical subsurface flow wetland; in the aspect of water path control of the wetland, the wetland drainage system is mainly optimized. Compared with the prior art, the urban runoff rainwater wetland intelligent regulation and control system and method provided by the invention are different in that the system and method are used for intelligently regulating and controlling urban runoff rainwater wetlands under different rainfall conditions, particularly under heavy rainfall weather. The patent adopts scientific management measures to effectively manage the runoff pollution.
Disclosure of Invention
The invention aims to provide an urban runoff rainwater wetland intelligent regulation and control system and method, which are used for realizing detection and judgment of water inlet and water outlet and carrying out intelligent allocation through the system.
In order to achieve one of the above purposes, the invention provides an intelligent regulation and control system for urban runoff rainwater wetlands, which comprises a closure unit, a wetland unit, a water inlet judgment unit, a water outlet judgment unit and a regulation unit;
the intercepting unit is arranged at the foremost end of the system and is used for collecting surface runoff and mixed flow sewage possibly appearing in non-rainfall weather in a catchment area around the river channel as inflow water and conveying the inflow water into the wetland unit;
the wetland unit comprises a vertical flow wetland, an aeration vertical flow wetland and an ecological pond, wherein the vertical flow wetland and the aeration vertical flow wetland are connected in parallel and then connected in series with the ecological pond to treat inlet water;
the adjusting unit comprises an effluent backflow component and an overrunning component, and ensures the effluent, backflow and overrunning water flow routes of the wetland unit; the water inlet judging unit determines to convey one or two of the vertical flow wetland and the aeration vertical flow wetland according to the water quality and the water quantity of the interception unit; the effluent judgment unit determines according to the effluent quality of the ecological pond, and realizes drainage or backflow to the water inlet judgment unit for judgment again through the effluent backflow component.
Furthermore, the intercepting unit is formed by connecting a plurality of intercepting wells in parallel, and a first water pump is arranged in each intercepting well.
Furthermore, a first electric valve is arranged at the water inlet end of the vertical flow wetland, and a second electric valve is arranged at the water inlet end of the aeration vertical flow wetland.
Furthermore, the water inlet judging unit and the water outlet judging unit are structurally consistent and respectively comprise flow detection equipment and water quality detection equipment, the flow detection equipment and the water quality detection equipment are of a series structure, the flow detection equipment is an electromagnetic flowmeter, and the water quality detection equipment is a spectrum probe.
Furthermore, the effluent backflow component comprises a second water pump, a third electric valve, a backflow pipe and a fourth electric valve which are arranged at the outlet of the ecological pond, the starting point of the backflow pipe is located between the second water pump and the third electric valve, and the terminal point of the backflow pipe is located between the interception unit and the water inlet judgment unit and is used for backflow of the effluent of the ecological pond which does not reach the standard.
Furthermore, the overrunning component comprises a overrunning pipe and a fifth electric valve, wherein the starting point of the overrunning pipe is positioned between the water inlet judging unit and the wetland unit, and the terminal point is positioned at the rear ends of the vertical flow wetland and the aeration vertical flow wetland which are connected in parallel and at the front end of the ecological pond and is used for shunting the inlet water exceeding the design load.
The invention also provides a regulation and control method of the urban runoff rainwater wetland intelligent regulation and control system, which comprises the steps of,
s1, collecting surface runoff and mixed flow sewage possibly occurring in non-rainfall weather in a catchment area around the river channel by the intercepting unit, and sending the mixed flow sewage to the water inlet judging unit through the intercepting unit;
s2, judging the water inlet quantity by the water inlet judging unit, judging the mode as a small water quantity mode when the accumulated water inlet quantity is less than a first water quantity set threshold value, and entering the step S3; when the accumulated amount of the incoming water is greater than or equal to the first water amount setting threshold and less than the second water amount setting threshold, the mode is determined as the large water amount mode, and the process proceeds to step S4; when the accumulated amount of the incoming water is larger than or equal to the second water amount setting threshold, the mode is judged to be the ultra-large water amount mode, and the step S6 is executed;
s3, COD and NH of inflow water by the inflow water judgment unit4N, judging when COD is less than the inlet water COD set threshold value and NH4N < NH admission4When the threshold value is set by N, the incoming water enters the ecological pond after being treated by the vertical flow wetland; when COD is more than or equal to the COD set threshold value of the inlet water or NH4-N.gtoreq.water NH4When the threshold value is set by N, the incoming water enters the ecological pond after being treated by the aeration vertical flow wetland, and the step S5 is carried out;
s4, directly feeding water into the aerated vertical flow wetland for treatment, stopping feeding water into the aerated vertical flow wetland when the aerated vertical flow wetland reaches the maximum treatment water amount, feeding subsequent incoming water into the vertical flow wetland for treatment, stopping feeding water into the vertical flow wetland when the vertical flow wetland reaches the maximum treatment water amount, and feeding the effluent of the ecological pond into the step S5;
s5, enabling the effluent of the ecological pond to enter an effluent judgment unit, and enabling the effluent judgment unit to judge COD and NH of the effluent of the ecological pond4N, judging when COD is less than the set threshold value of the COD of the discharged water and NH4-N < Drain NH4When N is set as a threshold value, the liquid is directly discharged by gravity; when COD is more than or equal to the set threshold value of the COD of the discharged water or NH4-N.gtoreq.water discharge NH4When the N is set as a threshold value, the water flows back to the front end of the water inlet judging unit through the water outlet backflow assembly and water is fed again;
s6, after the inflow water passes through the inflow water judgment unit, the inflow water directly enters the ecological pond through the overrunning assembly, and the outflow water of the ecological pond is directly drained quickly without judgment when passing through the outflow water judgment unit.
Further, the first water quantity set threshold value is 10% of the rainwater intercepting quantity of the system catchment area, the second water quantity set threshold value is the sum of the maximum design water quantity of the aeration vertical flow wetland in 3 days and the maximum design water quantity of the vertical flow wetland in 3 days, the water inlet COD set threshold value is 50 mg/L, the water discharge COD set threshold value is 30 mg/L, and the water inlet NH is4-N setting a threshold of 5 mg/L, said water discharge NH4N sets the threshold to 1.5 mg/L.
Furthermore, the system is matched with a small-sized rain gauge for monitoring a rainfall event, when the rainfall event is monitored, a rainfall cycle period is set from the occurrence of one rainfall event to the end of one rainfall event, and when one rainfall event is ended, the accumulated water volume value of the flow detection equipment returns to zero; when the rainfall event is not monitored, taking the day as a cycle unit as a cycle period of a sunny day, and when the cycle period of the sunny day is finished, the accumulated water inflow amount value of the flow detection equipment returns to zero.
Furthermore, a protective low liquid level and a starting liquid level are arranged in the intercepting unit, when the water level in the intercepting unit exceeds the starting liquid level, the intercepting unit feeds water into the system, and when the water level in the intercepting unit is reduced to the protective low liquid level, the intercepting unit stops feeding water.
The invention has the beneficial effects that: the problem of waterlogging caused by large rainwater storage pressure due to the fact that a large amount of runoff enters a municipal sewage plant and a city river channel through a pipeline in the rainfall period is solved; performing centralized treatment on mixed flow sewage which possibly appears in the early stage of rainfall and in the non-rainfall weather, and performing dispersed treatment on the mixed flow sewage in the middle and later stages of rainfall; can detect and judge into water and go out water to carry out intelligent allotment through the system, system availability factor is higher, it is more convenient to maintain, the cost is reduced moreover.
Drawings
FIG. 1 is a schematic structural diagram of an urban runoff rainwater wetland intelligent regulation and control system of the invention;
in the figure: 1. a shut-off unit; 11. a catch basin; 12. a first water pump; 2. a water inlet judging unit; 21. flow detection equipment, 22 and water quality detection equipment; 3. a wetland unit; 31. a first electrically operated valve; 32. a second electrically operated valve; 33. vertical flow wetland 34, aeration vertical flow wetland 35 and ecological pond; (ii) a 4. A water outlet judging unit; 5. a second water pump; 6. a third electrically operated valve; 7. a return pipe; 71. a fourth electrically operated valve; 8. a overrunning tube; 81. a fifth electrically operated valve.
Detailed Description
The present invention will be described in detail below with reference to embodiments shown in the drawings.
As shown in fig. 1, the urban runoff rainwater wetland intelligent regulation and control system comprises a closure unit 1, a wetland unit 3, a water inlet judgment unit 2, a water outlet judgment unit 4 and an adjustment unit.
The intercepting unit 1 can be formed by combining a plurality of intercepting wells 11 in parallel and is used for collecting surface runoff and mixed flow sewage possibly appearing in non-rainfall weather in a catchment area around a river channel as inflow water; a first water pump 12 is arranged in each intercepting well 11, and water flow conveying is realized by controlling the opening or closing of the first water pump 12; if the area with a larger water range is considered, a plurality of intercepting wells 11 can also adopt the combination of series connection and series-parallel connection; in the scheme, the intercepting unit 1 is formed by connecting a plurality of intercepting wells 11 in parallel.
The wetland unit 3 comprises a vertical flow wetland 33, an aeration vertical flow wetland 34 and an ecological pond 35, wherein the vertical flow wetland 33 and the aeration vertical flow wetland 34 are connected in parallel and then connected in series with the ecological pond 35, and the inflow water collected by the interception unit 1 is treated.
The inflow judgment unit 2 is arranged between the interception unit 1 and the wetland unit 3 and used for judging and controlling the amount and the quality of inflow water, and comprises a flow detection device 21 and a water quality detection device 22, wherein the flow detection device 21 and the water quality detection device 22 are of a serial structure, the flow detection device 21 usually adopts an electromagnetic flowmeter to detect the amount of inflow water, the water quality detection device 22 usually adopts a spectrum probe to detect the water quality state of inflow water, and the flow detection device 21 and the water quality detection device22, judging and controlling the detected water quantity signal and the detected water quality signal; flow detection equipment 21 and water quality testing equipment 22 can select different monitoring facilities according to the demand of different projects, and in this scheme, flow detection equipment 21 mainly records the accumulated water volume, and water quality testing equipment 22 mainly detects the index and is COD and NH4-N。
The effluent judgment unit 4 is arranged between the wetland unit 3 and the effluent backflow component and is used for judging the quality of the effluent treated by the ecological pond 35 and performing judgment control on effluent or backflow; the effluent judging unit 4 has the same structure as the influent judging unit 2. The adjusting unit comprises an effluent backflow component and an overrunning component, and ensures the water flow routes of effluent, backflow and overrunning of the wetland unit 3; the water inlet judging unit 2 determines to convey one or two of the vertical flow wetland 33 and the aeration vertical flow wetland 34 according to the water quality and the water quantity of the interception unit 1; the effluent judgment unit 4 determines the effluent quality according to the ecological pond 35, and realizes drainage or backflow to the influent judgment unit 2 for judgment again through the effluent backflow component.
The water outlet backflow component is positioned at the rear end of the ecological pond 35 and consists of a second water pump 5, a third electric valve 6, a backflow pipe 7 and a fourth electric valve 71, the starting point of the backflow pipe 7 is positioned between the second water pump 5 and the third electric valve 6, and the terminal point is positioned between the interception unit 1 and the water inlet judgment unit 2 and is used for returning the effluent of the ecological pond 35 which does not reach the standard. The transcendent assembly is arranged between the water inlet judging unit 2 and the wetland unit 3 at the starting point, is arranged at the rear ends of the vertical flow wetland 33 and the aeration vertical flow wetland 34 which are connected in parallel at the front end of the ecological pond 35 at the terminal point, consists of a transcendent pipe 8 and a fifth electric valve 81 and is used for shunting the water inlet exceeding the designed load. More specifically, when the amount of the incoming water is too large and exceeds the sum of the maximum treatment water amounts of the vertical flow wetland 33 and the aerated vertical flow wetland 34, the incoming water directly enters the ecological pond 35 through the overrun pipe 8, and the loads of the vertical flow wetland 34 and the aerated vertical flow wetland 34 are reduced; based on the structure, in order to facilitate control, the first electric valve 31 is arranged at the water inlet end of the vertical flow wetland 33, the second electric valve 32 is arranged at the water inlet end of the aerated vertical flow wetland 34, and the fifth electric valve 81 is arranged on the overrunning pipe 8.
Based on the system, a regulation method is designed for the urban runoff rainwater wetland intelligent regulation system, and before entering the regulation method, the rainwater interception quantity Q of a catchment area (namely, the area of the catchment area is the rainfall capacity is the runoff coefficient) is calculated according to the conditions of the area, the rainfall capacity and the runoff coefficient of the catchment area around each urban river channel; the precipitation value is suggested to be 20mm, but the precipitation value is not limited to 20mm according to the rainfall condition of different areas. The unit of the throughput Q referred to in this patent is m3. The patent relates to the term of '3-day maximum design water volume', in particular to a wetland unit 3 which is used for mixed flow sewage possibly appearing in surface runoff and non-rainfall weather in a catchment area around a river channel, wherein the instantaneous water volume of rainwater is large during rainfall, and the wetland unit is designed according to the maximum water volume of multiple days and the maximum water volume of a year.
Examples
In this embodiment, Q may also be a fixed value obtained by other calculation methods such as a local rainstorm intensity calculation formula for a specific implementation item.
The first water quantity setting threshold value is 10 percent of the rainwater interception quantity Q of the catchment area, namely 10 percent Q, the second water quantity setting threshold value is 130 percent Q of the sum of the maximum design water quantity in 3 days of the vertical flow wetland 33 and the maximum design water quantity in 3 days of the aeration vertical flow wetland 34, the maximum design water quantity in 3 days of the vertical flow wetland 33 is 130 percent of the average design water quantity in 3 days of the vertical flow wetland 33, the maximum design water quantity in 3 days of the aeration vertical flow wetland 34 is 130 percent of the average design water quantity in 3 days of the aeration vertical flow wetland 34, the water inlet COD setting threshold value is 50 mg/L, the water discharge COD setting threshold value is 30 mg/L, water inlet NH (ammonia) is fed4N setting threshold of 5 mg/L, water discharge NH4N sets the threshold to 1.5 mg/L.
S1, collecting surface runoff and mixed flow sewage possibly occurring in non-rainfall weather in a catchment area around the river channel by the catch basin 11 of the catch basin unit 1, and sending the incoming water to the water inlet judging unit 2 by the first water pump 12 after receiving the processing signal. The first water pump 12 is normally open and automatically starts when a start level is reached and stops when a protection low level is reached. When the vertical flow wetland 33 and the aerated vertical flow wetland 34 need to be in bed rest, the first electric valve 31 and the second electric valve 32 can be respectively closed.
S2, the electromagnetic flowmeter 21 in the water inlet judging unit 2 judges the accumulated water volume, at this time, the accumulated water volume Q1 is calculated, when Q1 is less than 10% Q, the mode is judged to be a small water volume mode, and the step S3 is entered for judging the water quality; when the Q is more than or equal to 10% and less than or equal to Q1 and less than 130% Q, the mode is judged to be the large water volume mode, and the step S4 is carried out to carry out corresponding treatment; and when the Q1 is more than or equal to 130% Q, judging the mode to be the ultra-large water volume mode, and entering the step S6 to carry out corresponding processing.
S3, when the water volume mode is small, it shows that the surface runoff in the early stage of rainfall or mixed flow sewage possibly appearing in the non-rainfall weather are treated, the spectrum probe 22 in the inflow water judging unit 2 judges COD and NH of the inflow water4Judgment is made when COD is < 50 mg/L and NH is4When N is less than 5 mg/L, the first electric valve 31 in the wetland unit 3 is opened and the second electric valve 32 is kept closed, then the incoming water enters the vertical flow wetland 33 for treatment and enters the ecological pond 35 after treatment, and when COD is more than or equal to 50 mg/L or NH4When the N is more than or equal to 5 mg/L, the second electric valve 32 in the wetland unit 3 is opened and the first electric valve 31 is kept closed, then the inlet water enters the aeration vertical flow wetland 34 for treatment, enters the ecological pond 35 after treatment, continues to treat the inlet water in the ecological pond 35, and then enters the step S5.
S4, when the water volume mode is a large water volume mode, the middle and later periods of rainfall are shown, the second electric valve 32 in the wetland unit 3 is opened, the first electric valve 31 is kept closed, incoming water firstly enters the aeration vertical flow wetland 34 for treatment, the water inlet volume is recorded through the electromagnetic flow meter 21, when the aeration vertical flow wetland 34 reaches the maximum treatment water volume, the first electric valve 31 in the wetland unit 3 is opened, the second electric valve 32 is closed, the subsequent incoming water does not enter the aeration vertical flow wetland 34 any more, and directly enters the vertical flow ecological wetland 33, and when the vertical flow ecological wetland 33 reaches the maximum treatment water volume, the first electric valve 3 is also closed; the effluent of the aerated vertical-flow wetland 34 and the vertical-flow ecological wetland 33 enters the ecological pond 35, the ecological pond 35 continues to treat the incoming water, and then the step S5 is carried out.
S5, the effluent of the ecological pond 35 enters a drainage judgment unit 4, and the drainage judgment unit 4 judges COD and NH of the effluent of the ecological pond 354Judgment is made when COD is less than 30 mg/L and NH is4When N is less than 1.5 mg/L, the sewage is directly discharged by gravity flow through the second water pump 5 and the third electric valve 6 or is utilized in other aspects, and when COD is more than or equal to 30 mg/L or NH4When N is more than or equal to 1.5 mg/L, the water flows back to the front end of the water inlet judging unit 2 through the return pipe 7 of the water outlet return assembly and the fourth electric valve 71 to be refilled with water.
S6, when the ultra-large water quantity mode is adopted, the late stage of heavy rainfall is indicated, the quality of the incoming water is good, the vertical flow wetland 33, the aeration vertical flow wetland 34 and the ecological pond 35 are all in a high-load state, and in order to prevent waterlogging, the wetland unit 2 is required to quickly discharge the incoming water; therefore, when the inflow water passes through the inflow water judgment unit 2, the water amount is accumulated only through the electromagnetic flowmeter 21 of the inflow water judgment unit 2, the water quality judgment is not made, the water directly enters the ecological pond 35 through the overrunning pipe 8 and the fifth electric valve 81 of the overrunning assembly, the main function of the ecological pond 35 at the moment is the water storage amount regulation, the water quality is not detected when the water storage amount exceeding part passes through the outflow water judgment unit 4, the water amount is recorded only through the electromagnetic flowmeter 21 of the outflow water judgment unit 4, and the quick drainage is directly performed through the drainage assembly 5 and the third electric valve 6.
In the initial starting state of the whole system, the electromagnetic flow meter 21 and the spectrum probe 22 in the water inlet judging unit 2 need to give starting reaction time, so that the inlet water is defaulted to directly enter the aeration vertical flow wetland 34 for treatment at the beginning, and then enter a judging mode after the monitoring data of the electromagnetic flow meter 21 and the spectrum probe 22 are stable.
The system is provided with a small rain gauge to monitor whether a rainfall event occurs, and the judging mode in the step S2 is mainly divided into two modes, namely a rainy day mode and a sunny day mode.
In the first rain mode, when it is detected that a rainfall event occurs, a rainfall cycle period is defined as a period from occurrence to completion of one rainfall event, and when one rainfall event is completed, the accumulated amount of incoming water of the flow rate detection device 21 returns to zero.
The second is a clear day mode, in which a day is taken as a cycle unit as a cycle period of a clear day, when one cycle period of the clear day is finished, the accumulated water volume value of the flow rate detection device 21 returns to zero, and when the next cycle period of the clear day is started, the water volume is accumulated again; under the fine day mode, the condition that the water yield is very little appears, under this condition, set up protection low liquid level and start-up liquid level in vatch basin 11, the value of protection low liquid level is generally the same for the protection low liquid level value of first water pump 12, the surface runoff handling capacity that calculates according to catchment district sets up the start-up liquid level, when the water level surpassed the start-up liquid level in vatch basin 11, first water pump 12 opened and supplies sewage to the wetland, when the water level reduced to protection low liquid level in vatch basin 11, first water pump 12 stopped working.
And then, the mode is selected to enter a sunny mode or a rainy mode according to specific conditions.
To sum up, through above-mentioned system and control mode, can be applicable to the implementation project to different areas, carry out intelligent allotment through this system, the system availability factor is higher, it is more convenient to maintain, and use cost is lower, is applicable to city, rural, town and country juncture river course periphery.
It is to be emphasized that: the above embodiments are only preferred embodiments of the present invention, and are not intended to limit the present invention in any way, and all simple modifications, equivalent changes and modifications made to the above embodiments according to the technical spirit of the present invention are within the scope of the technical solution of the present invention.
Claims (10)
1. An urban runoff rainwater wetland intelligent regulation and control system comprises a closure unit (1), a wetland unit (3), a water inlet judgment unit (2), a water outlet judgment unit (4) and an adjusting unit;
the intercepting unit (1) is arranged at the foremost end of the system and is used for collecting surface runoff and mixed flow sewage possibly appearing in non-rainfall weather in a catchment area around the river channel as inflow water and conveying the inflow water into the wetland unit (3);
the wetland unit (3) comprises a vertical flow wetland (33), an aeration vertical flow wetland (34) and an ecological pond (35), wherein the vertical flow wetland (33) is connected with the aeration vertical flow wetland (34) in parallel and then connected with the ecological pond (35) in series to treat inlet water;
the water inlet judging unit (2) is arranged between the interception unit (1) and the wetland unit (3) and is used for judging the quality and quantity of inlet water; the effluent judgment unit (4) is arranged between the wetland unit (3) and the effluent backflow assembly and is used for judging the effluent quality of the ecological pond (35);
the method is characterized in that: the adjusting unit comprises a water outlet backflow component and an overrunning component, and ensures water outlet, backflow and overrunning water flow routes of the wetland unit (3); the water inlet judging unit (2) determines to convey one or two of the vertical flow wetland (33) and the aeration vertical flow wetland (34) according to the water quality and the water quantity of the interception unit (1); the effluent judgment unit (4) determines the effluent quality according to the ecological pond (35), and realizes drainage or backflow to the water inlet judgment unit (2) for re-judgment through the effluent backflow component.
2. The urban runoff rainwater wetland intelligent regulation and control system according to claim 1, characterized in that the intercepting unit (1) is formed by connecting a plurality of intercepting wells (11) in parallel, and a first water pump (12) is arranged in each intercepting well (11).
3. The urban runoff rainwater wetland intelligent control system according to claim 1, wherein a first electric valve (31) is arranged at the water inlet end of the vertical flow wetland (33), and a second electric valve (32) is arranged at the water inlet end of the aeration vertical flow wetland (34).
4. The urban runoff rainwater wetland intelligent regulation and control system according to claim 1, wherein the inflow judgment unit (2) and the outflow judgment unit (4) are structurally identical and respectively comprise a flow detection device (21) and a water quality detection device (22), the flow detection device (21) and the water quality detection device (22) are in a series structure, the flow detection device (21) is an electromagnetic flowmeter, and the water quality detection device (22) is a spectrum probe.
5. The urban runoff rainwater wetland intelligent regulation and control system according to claim 1, wherein the effluent backflow assembly comprises a second water pump (5), a third electric valve (6), a backflow pipe (7) and a fourth electric valve (71) which are arranged at the outlet of the ecological pond, the starting point of the backflow pipe (7) is located between the second water pump (5) and the third electric valve (6), and the terminal point is located between the interception unit (1) and the inflow judgment unit (2), and is used for backflow of effluent from the unqualified ecological pond (35).
6. The urban runoff rainwater wetland intelligent regulation and control system according to claim 1, wherein the overrunning component comprises an overrunning pipe (8) and a fifth electric valve (81), the starting point of the overrunning pipe (8) is located between the water inlet judging unit (2) and the wetland unit (3), and the terminal point is located at the rear ends of the vertical flow wetland (33) and the aeration vertical flow wetland (34) which are connected in parallel and at the front end of the ecological pond (35) and is used for shunting the inlet water exceeding the design load.
7. A regulation and control method of the urban runoff rainwater wetland intelligent regulation and control system based on the claim 1 is characterized by comprising the following steps,
s1, collecting surface runoff and mixed flow sewage possibly occurring in non-rainfall weather in a catchment area around the river channel by the cut-off unit (1), and sending the mixed flow sewage to the water inlet judging unit (2) through the cut-off unit (1);
s2, judging the water inlet quantity by the water inlet judging unit (2), judging the mode as a small water quantity mode when the accumulated water inlet quantity is less than a first water quantity set threshold value, and entering step S3; when the accumulated amount of the incoming water is greater than or equal to the first water amount setting threshold and less than the second water amount setting threshold, the mode is determined as the large water amount mode, and the process proceeds to step S4; when the accumulated amount of the incoming water is larger than or equal to the second water amount setting threshold, the mode is judged to be the ultra-large water amount mode, and the step S6 is executed;
s3, COD and NH of inflow water by the inflow water judgment unit (2)4N, judging when COD is less than the inlet water COD set threshold value and NH4N < NH admission4When a threshold value is set by N, the incoming water enters an ecological pond (35) after being treated by the vertical flow wetland (33); when COD is not less than the inlet water COD settingThreshold value or NH4-N.gtoreq.water NH4When the threshold value is set by N, the incoming water enters the ecological pond (35) after being treated by the aerated vertical flow wetland (34), and the step S5 is carried out;
s4, directly feeding water into the aerated vertical flow wetland (34) for treatment, stopping feeding water into the aerated vertical flow wetland (34) when the aerated vertical flow wetland (34) reaches the maximum treatment water amount, feeding the subsequent incoming water into the vertical flow wetland (33) for treatment, stopping feeding water into the vertical flow wetland (33) when the vertical flow wetland (33) reaches the maximum treatment water amount, and feeding the effluent of the ecological pond (35) into the step S5;
s5, enabling the effluent of the ecological pond to enter an effluent judgment unit (4), and enabling the effluent judgment unit (4) to judge COD and NH of the effluent of the ecological pond (35)4N, judging when COD is less than the set threshold value of the COD of the discharged water and NH4-N < Drain NH4When N is set as a threshold value, the liquid is directly discharged by gravity; when COD is more than or equal to the set threshold value of the COD of the discharged water or NH4-N.gtoreq.water discharge NH4When the N is set as a threshold value, the water flows back to the front end of the water inlet judging unit (2) through the water outlet backflow component to re-feed water;
s6, after the inflow water passes through the inflow water judgment unit (2), the inflow water directly enters the ecological pond (35) through the overrunning assembly, and the outflow water of the ecological pond is directly drained quickly without judgment when passing through the outflow water judgment unit (4).
8. The regulation and control method according to claim 7, characterized in that the first water quantity setting threshold is 10% of the rainwater interception quantity of the system catchment area, the second water quantity setting threshold is the sum of the maximum design water quantity of the aeration vertical flow wetland (34) in 3 days and the maximum design water quantity of the vertical flow wetland (33) in 3 days, the inlet water COD setting threshold is 50 mg/L, the outlet water COD setting threshold is 30 mg/L, and the inlet water NH is4-N setting a threshold of 5 mg/L, said water discharge NH4N sets the threshold to 1.5 mg/L.
9. The regulation and control method according to claim 7, characterized in that the system is provided with a small rain gauge for monitoring a rainfall event, when the rainfall event is monitored, a rainfall cycle period is defined as a period from the occurrence of one rainfall event to the end of the rainfall event, and when the one rainfall event is ended, the accumulated water inflow value of the flow detection device (21) returns to zero; when the rainfall event is not monitored, taking the day as a cycle unit as a cycle period of a sunny day, and when the cycle period of the sunny day is finished, the accumulated water inflow value of the flow detection equipment (21) returns to zero.
10. The method for regulating and controlling according to claim 7, characterized in that a protective low level and a start level are provided in the interception unit (1), the interception unit (1) feeds water to the system when the water level in the interception unit (1) exceeds the start level, and the interception unit (1) stops feeding water when the water level in the interception unit (1) decreases to the protective low level.
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