CN116573769B - Dual-mode biological retention system and processing method - Google Patents
Dual-mode biological retention system and processing method Download PDFInfo
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- CN116573769B CN116573769B CN202310543521.0A CN202310543521A CN116573769B CN 116573769 B CN116573769 B CN 116573769B CN 202310543521 A CN202310543521 A CN 202310543521A CN 116573769 B CN116573769 B CN 116573769B
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- 230000014759 maintenance of location Effects 0.000 title abstract description 11
- 238000003672 processing method Methods 0.000 title description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 53
- 238000011282 treatment Methods 0.000 claims abstract description 50
- 238000011866 long-term treatment Methods 0.000 claims abstract description 37
- 238000000034 method Methods 0.000 claims abstract description 13
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 36
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 20
- 229910052799 carbon Inorganic materials 0.000 claims description 20
- 238000009301 bioretention Methods 0.000 claims description 18
- 229910052757 nitrogen Inorganic materials 0.000 claims description 18
- 241000196324 Embryophyta Species 0.000 claims description 16
- 238000012545 processing Methods 0.000 claims description 13
- 230000009977 dual effect Effects 0.000 claims description 10
- 239000010865 sewage Substances 0.000 claims description 10
- NIFIFKQPDTWWGU-UHFFFAOYSA-N pyrite Chemical group [Fe+2].[S-][S-] NIFIFKQPDTWWGU-UHFFFAOYSA-N 0.000 claims description 8
- 229910052683 pyrite Inorganic materials 0.000 claims description 8
- 239000011028 pyrite Substances 0.000 claims description 8
- 238000005192 partition Methods 0.000 claims description 7
- 235000014676 Phragmites communis Nutrition 0.000 claims description 6
- 239000011159 matrix material Substances 0.000 claims description 6
- 230000007774 longterm Effects 0.000 claims description 5
- 239000012528 membrane Substances 0.000 claims description 5
- 239000002245 particle Substances 0.000 claims description 5
- 239000004576 sand Substances 0.000 claims description 5
- 239000002689 soil Substances 0.000 claims description 5
- 239000004746 geotextile Substances 0.000 claims description 4
- 241000209046 Pennisetum Species 0.000 claims description 3
- 229910021536 Zeolite Inorganic materials 0.000 claims description 3
- GJEAMHAFPYZYDE-UHFFFAOYSA-N [C].[S] Chemical compound [C].[S] GJEAMHAFPYZYDE-UHFFFAOYSA-N 0.000 claims description 3
- HNPSIPDUKPIQMN-UHFFFAOYSA-N dioxosilane;oxo(oxoalumanyloxy)alumane Chemical compound O=[Si]=O.O=[Al]O[Al]=O HNPSIPDUKPIQMN-UHFFFAOYSA-N 0.000 claims description 3
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- XKMRRTOUMJRJIA-UHFFFAOYSA-N ammonia nh3 Chemical compound N.N XKMRRTOUMJRJIA-UHFFFAOYSA-N 0.000 description 2
- 230000001651 autotrophic effect Effects 0.000 description 2
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- 238000012851 eutrophication Methods 0.000 description 2
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Classifications
-
- 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
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01W—METEOROLOGY
- G01W1/00—Meteorology
- G01W1/14—Rainfall or precipitation gauges
-
- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B19/00—Programme-control systems
- G05B19/02—Programme-control systems electric
- G05B19/04—Programme control other than numerical control, i.e. in sequence controllers or logic controllers
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/16—Nitrogen compounds, e.g. ammonia
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/001—Runoff or storm water
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2203/00—Apparatus and plants for the biological treatment of water, waste water or sewage
- C02F2203/006—Apparatus and plants for the biological treatment of water, waste water or sewage details of construction, e.g. specially adapted seals, modules, connections
-
- 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
- C02F2209/42—Liquid level
-
- Y—GENERAL 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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W10/00—Technologies for wastewater treatment
- Y02W10/10—Biological treatment of water, waste water, or sewage
Abstract
The invention discloses a dual-mode biological retention system and a treatment method, comprising the following steps: the planting layer, the medium layer, the submerged layer and the drainage layer are arranged from top to bottom; the submerged layer and the drainage layer are both provided with a long-term treatment area and a real-time treatment area; further comprises: the device comprises a transverse electric door, a longitudinal electric door, a water level monitor, an inductor and a signal controller; the transverse electric door and the longitudinal electric door are respectively used for switching the working modes of the long-term treatment area and the real-time treatment area of the submerged layer and the drainage layer; the signal controller respectively acquires and identifies the data of the sensor and the water level monitor and controls the opening and closing of the transverse electric door and the longitudinal electric door. According to the invention, by arranging the long-term treatment area and the real-time treatment area and regulating and controlling the addition of the treatment area and the electron donor, stable denitrification is realized when only runoff rainwater enters, and high-efficiency denitrification can be realized through the combined action of the long-term treatment area and the real-time treatment area when CSO flows in; meanwhile, the depth of the submerged layer can be adjusted according to different rainfall grades, so that the denitrification effect is enhanced.
Description
Technical Field
The invention relates to the technical field of water treatment, in particular to a dual-mode biological retention system and a treatment method.
Background
With the acceleration of the urban process, the urban rainwater problem is increasingly prominent, and the rainwater runoff pollution problem is also increasingly serious. At present, a diversion drainage system is commonly adopted in a newly built area and an old city reconstruction area of a city, although the running load of a sewage treatment plant can be reduced, runoff rainwater, particularly initial rainwater, directly enters into urban water bodies without any treatment, serious harm is caused to urban water environment, and a confluence drainage system is still commonly adopted in an old city region which is not reconstructed in the city, but confluence overflow pollution is generated when the rainfall is large, and impact is caused to the urban water bodies.
The runoff rainwater has various pollutants, and nitrogen is one of main nutrient elements for eutrophication of water body, and is a pollutant which is of great concern in the runoff rainwater. Ammonia nitrogen (NH 4) in runoff rainwater + -N) concentration in the range of 0.069-58.83mg/L, nitrate nitrogen (NO 3) - Up to 32.63mg/L, high concentrations of nitrogen entering the surface water system can cause eutrophication of the water body, which poses a threat to the quality of the water environment. According to statistics, more than half of nitrogen pollution in urban water bodies in many countries and regions comes from runoff rainwater input, the occurrence forms of nitrogen are more, the pollution characteristics of nitrogen in different forms are different, and the mobility of more dissolved nitrogen in runoff rainwater is stronger, so that the realization of high-efficiency control of nitrogen pollution of rainwater runoff is of great importance.
A bioretention system, which is one of typical rainwater facilities in a Low Impact Development (LID) system, has a relatively good effect on removal of pollutants such as ammonia nitrogen, but it also has many disadvantages such as unsatisfactory removal of nitrate nitrogen due to lack of sufficient electron donor and denitrification environment. In order to improve the denitrification efficiency of the biological detention pond, two measures of raising the water outlet pipe to establish a submerged area and adding an electron donor are widely adopted, the electron donor (carbon source or sulfur source) provides sufficient electron donor for heterotrophic denitrification or autotrophic denitrification, and raising the water outlet pipe (establishing the submerged area) creates an anoxic environment suitable for the growth of denitrifying bacteria at the bottom of the biological detention pond, so that the hydraulic retention time is prolonged, and the denitrification is facilitated. However, after the two measures are adopted, the biological detention system still cannot realize real-time high-efficiency denitrification, and two reasons exist for the two reasons, namely, the initial stage rainwater nitrogen concentration is highest after rainfall, but the initial stage rainwater nitrogen concentration can be directly discharged from the biological detention system, the submerged area cannot be utilized for denitrification, and the rainwater with lower nitrogen concentration in the later stage of rainfall is finally stored in the submerged area for treatment. Secondly, the biological detention system is a non-continuous flow operation mode, the operation mode needs to rely on a submerged layer for a long time to carry out denitrification treatment on water stored in an area, but the depth of a submerged area of the traditional biological detention system is limited and fixed, the volume of an anaerobic area cannot be increased when the rainfall capacity is large or the concentration of pollutants is high, the denitrification capacity of the system is improved, rainwater can be continuously detained in the submerged area and cannot be discharged in time after rainfall, other pollutants in the system are accumulated along with the increase of the detention time, and a plurality of bacteria and other pathogens are bred, so that secondary pollution of a water body is caused.
Therefore, how to provide a biological retention system which can realize high-efficiency denitrification and continuous operation and avoid secondary pollution of water body is a technical problem which needs to be solved by the people in the field.
Disclosure of Invention
In view of the above, the invention provides a dual-mode biological retention system and a treatment method, which are characterized in that a long-term treatment area and a real-time treatment area are arranged, and the regulation and control of the two treatment areas are the same as the addition of an electron donor, so that stable denitrification can be ensured through the real-time rainwater treatment area when only runoff rainwater enters, and high-efficiency denitrification can be realized through the combined action of the long-term treatment area and the real-time treatment area when CSO flows in, and the treatment modes can be switched under different water quality conditions; in addition, the invention can adjust the depth of the submerged layer according to different rainfall grades, thereby further enhancing the denitrification effect. Meanwhile, the processing method of the invention realizes intelligent control, is convenient to use and is suitable for wide popularization.
One of the objects of the present invention is to provide a dual mode bio-retention system, comprising in particular:
a dual mode bio-retention system, comprising: the planting layer, the medium layer, the submerged layer and the drainage layer are arranged from top to bottom;
the submerged layer and the drainage layer are both provided with a long-term treatment area and a real-time treatment area;
further comprises: the device comprises a transverse electric door, a longitudinal electric door, a water level monitor, an inductor and a signal controller;
the transverse electric door is positioned between the medium layer and the submerged layer and is used for switching working modes of a long-term processing area and a real-time processing area of the submerged layer;
the longitudinal electric door is positioned between the long-term treatment area and the real-time treatment area of the drainage layer and is used for switching working modes of the long-term treatment area and the real-time treatment area of the drainage layer;
the water level monitor is positioned at the inner side of the transverse electric door;
the sensor is positioned in the medium layer and is used for sensing whether sewage flowing into the medium layer is overflow sewage in a combined system or not;
the signal controller respectively acquires and identifies the data of the sensor and the water level monitor, and controls the opening and closing of the transverse electric door and the longitudinal electric door.
The beneficial effects of adopting above-mentioned technical scheme include at least: the invention divides the inundation layer and the drainage layer, thereby effectively switching the modes of a long-term treatment area and a real-time treatment area according to different water quality conditions and different rainfall intensities, strengthening the denitrification efficiency of runoff rainwater and combined overflow sewage, namely CSO, and simultaneously reducing the problems of pollutant accumulation and germ breeding caused by rainwater retention.
In addition, the water level monitor can accurately monitor the water level condition of the submerged layer, the sensor senses whether sewage flowing into the medium layer is overflow sewage in a combined system or not, and then the signal controller controls the opening and closing of the transverse electric door and the longitudinal electric door, so that intelligent automatic control of working modes of a long-term treatment area and a real-time treatment area is realized.
Preferably, a space is formed between the dielectric layer and the submerged layer, and the transverse electric door is installed in the space, so that the transverse electric door is prevented from being blocked by the filler.
Preferably, the transverse electric door comprises a first transverse electric door and a second transverse electric door;
the first transverse electric door is fixedly connected with the second transverse electric door through a partition plate;
the transverse electric door controls the opening and closing of the working mode of the submerged layer long-term treatment area;
and the second transverse electric door controls the opening and closing of the working mode of the submerged layer real-time treatment area.
The beneficial effects of adopting above-mentioned technical scheme include at least: the transverse electric door is provided with two, can handle according to actual rainwater condition, not only can improve processing speed and effect, all control through signal controller moreover, realizes accurate control.
Preferably, the planting layer, the medium layer, the bottom end of the medium layer, the top end of the submerged layer, the submerged layer and the drainage layer are all provided with diaphragms;
the diaphragm is geotextile;
the beneficial effects of adopting above-mentioned technical scheme include at least: on one hand, the penetration and crossing of materials of each treatment layer can be prevented; on the other hand, the material of the diaphragm is geotextile, the strength is high, and the diaphragm can keep sufficient strength and elongation in a dry and wet state; corrosion resistance, good water permeability and good water permeability; the microbial resistance is good, and the microbial resistance and the worm-eaten performance are not damaged; the use is convenient, and the material is soft, so the transportation, the laying and the use are convenient.
The sensor is a confluence overflow sensor;
preferably, the length ratio of the long-term treatment zone to the real-time treatment zone is 1:3;
the long-term treatment area and the real-time treatment area of the submerged area are separated by a partition board;
the long-term treatment area and the real-time treatment area of the drainage layer are longitudinally separated by two layers of diaphragms, and the longitudinal electric door is arranged in a gap between the two layers of diaphragms.
The beneficial effects of adopting above-mentioned technical scheme include at least: in the actual application process, most of the rainwater is not initial rainwater, so that the proportion of the initial rainwater is relatively small, and most of the rainwater is treated in real time; therefore, the length ratio of 1:3 is the best through test.
Preferably, the method further comprises: a drainage layer depth adjusting end;
the drainage layer depth adjusting end is positioned at the drainage layer water outlet end;
the drainage layer depth adjusting end is at least provided with a light rain drainage end, a medium rain drainage end and a heavy rain drainage end;
the corresponding heights of the small rain water draining end, the medium rain water draining end and the big rain water draining end are different and gradually increased;
and the drainage end is provided with an electromagnetic valve switch.
Preferably, the method further comprises: a solar power supply device and a rain amount monitor;
the solar power supply device provides electric energy for the dual-mode biological retention system;
the rainfall monitor is used for monitoring ground rainfall grade data and transmitting the data to the signal controller, and the signal controller acquires and identifies data information and controls the opening and closing of the small rain drainage end, the medium rain drainage end and the big rain drainage end.
The beneficial effects of adopting above-mentioned technical scheme include at least: the solar power supply equipment is adopted, so that the design concept of low carbon, energy conservation and environmental protection is reflected.
Preferably, the planting layer is filled with brown soil and sand, and the volume ratio is 2:8;
the plants on the planting layer are one or a combination of more than one of Iris, iris, reed and pennisetum;
the medium layer is filled with zeolite, and the grain diameter is 2-4mm; the proportion of the particle size can be adjusted again according to practical application, so that the detersive power is maximized.
The beneficial effects of adopting above-mentioned technical scheme include at least: the brown soil has proper organic matter content and high trace element content, and can meet the plant growth requirement; the arrangement of the sand enables the rainwater to quickly permeate after rainfall, so that the optimal permeation effect is realized.
The long-term treatment zone and the real-time treatment zone are filled with gravel and matrix, and the volume ratio is 7:3, a step of; wherein the matrix is pyrite and plant carbon source, and the sulfur-carbon ratio is 0.6.
The particle size of the gravel is 8-20mm, and the plant carbon source is mainly reed scraps.
The beneficial effects of adopting above-mentioned technical scheme include at least: when no CSO flows in, the concentration of pollutants such as nitrogen is low, and the carbon source in the runoff rainwater is insufficient at the moment, so that the denitrification effect is poor. After pyrite and plant carbon source are added, the pyrite can provide electrons for autotrophic denitrification, the plant carbon source can provide carbon source for heterotrophic denitrification, namely, high-efficiency denitrification can be realized by using a small amount of added plant carbon source and pyrite.
The plant carbon source is the resource utilization of plant wastes, and accords with the concept of low carbon and environmental protection.
When CSO flows in, the concentration of pollutants such as nitrogen is high, and the carbon source requirement for denitrification can not be met by adding a small amount of pyrite and plant carbon source, but the CSO carries part of the carbon source, so that sufficient carbon source can be ensured, and high-efficiency denitrification is realized.
Another object of the present invention is to provide a method for treating a dual-mode bio-retention system, which comprises:
1) When CSO does not flow in, the transverse electric door and the longitudinal electric door are both opened;
2) When CSO flows in, the first transverse electric door is opened, the second transverse electric door and the longitudinal electric door are closed, and the long-term treatment area is used for treating initial rainwater;
when the water level rises to the height of the water level monitor, a signal is sent, the first transverse electric door is closed, the second transverse electric door is opened, the longitudinal electric door is closed, and the real-time treatment area is used for treating rainwater;
when rainfall stops for 3 days or more, the rainfall monitor sends out a signal and transmits the signal to the signal controller, and the signal controller controls the transverse electric door and the longitudinal electric door to be opened;
3) The rainfall monitor recognizes the rainfall level and sends out corresponding signals to the signal controller, and the signal controller controls the opening and closing of the small rain drainage end, the medium rain drainage end and the big rain drainage end;
if the rainfall grade is light rain, the electromagnetic valve at the drainage end of the light rain is opened, and the other drainage ends are closed;
if the rainfall grade is medium rain, the electromagnetic valve at the drainage end of the medium rain is opened, and the other drainage ends are closed;
if the rainfall grade is heavy rain or heavy rain, the electromagnetic valve at the drainage end of the heavy rain is opened, and the other drainage ends are closed;
4) After the rainfall stops for at least three days, the rainfall monitor sends out signals again, the transverse electric door and the longitudinal electric door are opened, the electromagnetic valve at the drainage end of the small rain is opened, and other drainage ends are closed.
Preferably, step 1) when CSO is not flowing in, mainly treating runoff rainwater, the nitrogen concentration is 5.6-22.4mg/L,
step 2) while CSO is being fed, CSO is being treated with a nitrogen concentration of 19.6-41.5mg/L.
Preferably, the setting criteria of the rainfall level in step 3) are:
drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are required to be used in the embodiments or the description of the prior art will be briefly described below, and it is obvious that the drawings in the following description are only embodiments of the present invention, and that other drawings can be obtained according to the provided drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of a dual mode bio-retention system according to an embodiment of the present invention;
FIG. 2 is a schematic view of the submerged layer and drainage layer structure according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of the long-term processing area and the real-time processing area according to an embodiment of the present invention;
FIG. 4 is a block diagram of a conventional bio-retention system.
In the drawings:
1 is an overflow well, 2 is a plant, 3 is a planting layer, 4 is a medium layer, 5 is a submerged layer, 6 is a drainage layer, 7 is an overflow pipe, 8 is an inductor, 9 is a rainfall monitor, 10 is a signal controller, 11 is a power supply device, 12 is a lead, 13 is a solenoid valve switch, 14 is a drainage layer depth adjusting end, 15 is a diaphragm, 16 is a transverse electric door, 16-1 is a transverse electric door I, 16-2 is a transverse electric door II, 17 is a water level monitor, 18 is pyrite, 19 is a plant carbon source, 20 is gravel, 21 is a long-term treatment area, 22 is a real-time treatment area, 23 is a partition board, and 24 is a longitudinal electric door.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely, and it is apparent that the described embodiments are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Example 1
The present embodiment provides a dual-mode bio-retention system, specifically comprising:
a planting layer 3, a medium layer 4, a submerged layer 5 and a drainage layer 6 which are arranged from top to bottom,
the submerged layer 5 and the drainage layer 6 are provided with a long-term treatment area 21 and a real-time treatment area 22;
further comprises: a transverse electric door 16, a longitudinal electric door 24, a water level monitor 17, an inductor 8 and a signal controller 10;
the transverse electric door 16 is positioned between the dielectric layer 4 and the submerged layer 5 and is used for switching the working modes of the long-term processing area 21 and the real-time processing area 22 of the submerged layer 5;
the longitudinal electric door 24 is positioned between the long-term treatment area 21 and the real-time treatment area 22 of the drainage layer 6 and is used for switching the working modes of the long-term treatment area 21 and the real-time treatment area 22 of the drainage layer 6;
the water level monitor 17 is positioned inside the transverse electric door 16;
the sensor 8 is positioned in the medium layer 4 and is used for sensing whether sewage flowing into the medium layer 4 is overflow sewage in a combined system or not;
the signal controller 10 acquires and recognizes data of the sensor 8 and the water level monitor 17, respectively, and controls opening and closing of the lateral power door 16 and the longitudinal power door 24.
Further, a space is provided between the dielectric layer 4 and the submerged layer 5, and a lateral power door 16 is installed in the space.
In order to further optimize the technical scheme: the transverse electric door 16 comprises a first transverse electric door 16-1 and a second transverse electric door 16-2;
the first transverse electric door 16-1 and the second transverse electric door 16-2 are fixedly connected through a partition plate 23;
the first transverse electric door 16-1 controls the opening and closing of the long-term treatment area 21 of the submerged layer 5;
the second transverse electric door 16-2 controls the opening and closing of the operation mode of the real-time treatment area 22 of the submerged layer 5.
To further optimize the above technical solution, the length ratio of the long-term processing zone 21 to the real-time processing zone 22 is 1:3;
the long-term treatment area 21 and the real-time treatment area 22 of the submerged area 5 are separated by a partition 23;
the long-term treatment area 21 and the real-time treatment area 22 of the drainage layer 6 are longitudinally separated by the two-layer membrane 15, and a longitudinal electrically operated gate 24 is installed in the gap between the two-layer membrane 15.
In order to further optimize the technical scheme, the method further comprises the following steps: a drainage layer depth adjustment end 14;
the drainage layer depth adjusting end 14 is positioned at the water outlet end of the drainage layer 6;
the drainage layer depth adjusting end 14 is provided with at least a light rain drainage end, a medium rain drainage end and a heavy rain drainage end;
the corresponding heights of the small rain water draining end, the medium rain water draining end and the big rain water draining end are gradually increased;
and the drainage end is provided with a solenoid valve switch 13.
In order to further optimize the technical scheme, the diaphragms 15 are arranged between the planting layer 3 and the medium layer 4, between the submerged layer 5 and the drainage layer 6, and at the bottom end of the medium layer 4 and at the top end of the submerged layer 5.
To further optimize the above technical solution, the membrane 15 is geotextile;
the inductor 8 is a confluence overflow inductor;
in order to further optimize the technical scheme, the sensor 8 is arranged outside the tail end of the overflow pipe 7 in the medium layer 4; the overflow pipe 7 protrudes from the overflow well 1 and extends to the medium layer 4.
In order to further optimize the technical scheme, the method further comprises the following steps: a solar power supply device 11 and a rain amount monitor 9;
the solar power supply device 11 provides electric energy for the dual-mode biological retention system;
the rainfall monitor 9 is used for monitoring ground rainfall grade data and transmitting the data to the signal controller 10, and the signal controller 10 acquires and identifies data information and controls the opening and closing of the small rain drainage end, the medium rain drainage end and the big rain drainage end.
In order to further optimize the technical scheme, the planting layer 3 is filled with brown soil and sand, and the volume ratio is 2:8;
the plant 2 on the planting layer 3 is one or a combination of a plurality of iris, reed and pennisetum;
the medium layer 4 is filled with zeolite, and the grain diameter is 2-4mm; the proportion of the particle size can be adjusted again according to practical application, so that the detersive power is maximized.
In order to further optimize the above technical solution, the long-term treatment zone 21 and the real-time treatment zone 22 are filled with gravel 20 and matrix, with a volume ratio of 7:3, a step of; wherein the matrix is pyrite 18 and plant carbon source 19, and the sulfur-carbon ratio is 0.6.
The particle size of the gravel 20 is 8-20mm, and the plant carbon source 19 is mainly reed scraps.
Example 2
This embodiment provides a method for processing a dual-mode bio-retention system based on embodiment 1, specifically including:
1) When CSO does not flow in, the transverse electric door and the longitudinal electric door are both opened;
2) When CSO flows in, the first transverse electric door is opened, the second transverse electric door and the longitudinal electric door are closed,
the long-term treatment area is used for treating the initial rainwater;
when the water level rises to the height of the water level monitor, a signal is sent, the first transverse electric door is closed, the second transverse electric door is opened, the longitudinal electric door is closed, and the real-time treatment area is used for treating rainwater;
when rainfall stops for 3 days or more, the rainfall monitor sends out a signal and transmits the signal to the signal controller, and the signal controller controls the transverse electric door and the longitudinal electric door to be opened;
3) The rainfall monitor recognizes the rainfall level and sends out corresponding signals to the signal controller, and the signal controller controls the opening and closing of the small rain drainage end, the medium rain drainage end and the big rain drainage end;
if the rainfall grade is light rain, the electromagnetic valve at the drainage end of the light rain is opened, and the other drainage ends are closed;
if the rainfall grade is medium rain, the electromagnetic valve at the drainage end of the medium rain is opened, and the other drainage ends are closed;
if the rainfall grade is heavy rain or heavy rain, the electromagnetic valve of the heavy rain drainage section is opened, and the other drainage ends are closed;
4) After the rainfall stops for at least three days, the rainfall monitor sends out signals again, the transverse step electric door and the longitudinal step electric door are both opened, the electromagnetic valve at the water draining end of the light rain is opened, and the other water draining ends are closed.
Preferably, step 1) when CSO is not flowing in, mainly treating runoff rainwater, the nitrogen concentration is 5.6-22.4mg/L,
step 2) while CSO is being fed, CSO is being treated with a nitrogen concentration of 19.6-41.5mg/L.
In order to further optimize the above technical solution, the setting criteria of the rainfall level in step 3) are:
comparative example 1
This comparative example is a conventional bioretention system, structured as shown in fig. 4, comprising: planting layer and drainage layer, and the drain pipe is located the bottom of drainage layer.
The planting layer is Beijing brown soil and sand, and the volume ratio is 2:8;
the drainage layer is gravel.
Comparative example 2
The difference between this comparative example and example 1 is that: the submerged layer and the drainage layer are not provided with a long-term treatment area and a real-time treatment area, and are not provided with a diversion area I and a diversion area II.
Comparative example 3
The difference between this comparative example and example 1 is that: the drainage end is only provided with a rain drain end.
Comparative example 4
The difference between this comparative example and example 1 is that: both the long-term treatment zone 21 and the real-time treatment zone 22 are gravel packed.
And (3) performance detection:
the biological detention systems disclosed in the embodiment 1 and the comparative examples 1-4 are utilized to treat rainwater in the same batch, and the average temperature of the system operation is controlled above 15 ℃; comparison of denitrification capacities at the same throughput is shown in table 1:
TABLE 1
The detection method and the detection instrument for the data are shown in table 2:
TABLE 2
It should be noted that: after the dual-mode biological retention system is built, the microbial cultivation stage is carried out for 14-20 days, and during the microbial cultivation stage, the system is flushed for one week by tap water to flush out the original pollutants in the system; re-synthesizing high concentration NO 3 - -N rain water for one more week forPromoting the establishment of denitrification biological film. Finally, a 60 day pollutant removal efficacy study was performed with three NO levels, high, medium and low 3 - And (3) respectively carrying out 10 times of rainfall simulation events with the concentration of N, wherein the rainfall is carried out once every two days, the rainfall time is 4 hours, and determining the water inflow according to the design rainfall (33.6 mm) corresponding to the service area ratio of 10%, the rainfall runoff coefficient of 0.9 and the runoff total control rate of 85% in Beijing city according to the technical guidelines for sponge urban construction.
Parts of the embodiments of the present invention, which are not described in detail, may be implemented by using the prior art, and are not described herein.
In the present specification, each embodiment is described in a progressive manner, and each embodiment is mainly described in a different point from other embodiments, and identical and similar parts between the embodiments are all enough to refer to each other.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (8)
1. A dual mode bio-retention system, comprising: the planting layer, the medium layer, the submerged layer and the drainage layer are arranged from top to bottom;
the submerged layer and the drainage layer are both provided with a long-term treatment area and a real-time treatment area;
further comprises: the device comprises a transverse electric door, a longitudinal electric door, a water level monitor, an inductor and a signal controller;
the transverse electric door is positioned between the medium layer and the submerged layer and is used for switching working modes of a long-term processing area and a real-time processing area of the submerged layer;
the longitudinal electric door is positioned between the long-term treatment area and the real-time treatment area of the drainage layer and is used for switching working modes of the long-term treatment area and the real-time treatment area of the drainage layer;
the water level monitor is positioned at the inner side of the transverse electric door;
the sensor is positioned in the medium layer and is used for sensing whether sewage flowing into the medium layer is overflow sewage in a combined system or not;
the signal controller respectively acquires and identifies the data of the sensor and the water level monitor and controls the opening and closing of the transverse electric door and the longitudinal electric door;
the transverse electric door comprises a first transverse electric door and a second transverse electric door;
the first transverse electric door is fixedly connected with the second transverse electric door through a partition plate;
the transverse electric door controls the opening and closing of the working mode of the submerged layer long-term treatment area;
the second transverse electric door controls the opening and closing of the working mode of the submerged layer real-time treatment area;
further comprises: a drainage layer depth adjusting end;
the drainage layer depth adjusting end is positioned at the drainage layer water outlet end;
the drainage layer depth adjusting end is at least provided with a light rain drainage end, a medium rain drainage end and a heavy rain drainage end;
the corresponding heights of the small rain water draining end, the medium rain water draining end and the big rain water draining end are gradually increased;
the drainage end is provided with an electromagnetic valve switch;
further comprises: a rainfall monitor;
the rainfall monitor is used for monitoring ground rainfall grade data and transmitting the data to the signal controller, and the signal controller acquires and identifies data information and controls the opening and closing of the small rain drainage end, the medium rain drainage end and the big rain drainage end.
2. A dual mode bio-retention system according to claim 1 wherein the length ratio of the long term treatment zone and the real time treatment zone is 1:3;
the long-term treatment area and the real-time treatment area of the submerged layer are separated by a partition board;
the long-term treatment area and the real-time treatment area of the drainage layer are longitudinally separated by two layers of diaphragms, and the longitudinal electric door is arranged in a gap between the two layers of diaphragms.
3. A dual mode bio-retention system according to claim 2, wherein the membranes are arranged between the planting layer and the medium layer, the medium layer bottom end, the submerged layer top end, the submerged layer and the drainage layer.
4. A dual mode bio-retention system according to claim 3, wherein the membrane is geotextile; the inductor is a confluence overflow inductor.
5. A dual mode bio-retention system according to claim 3 wherein the planting layer is filled with brown soil and sand and has a volume ratio of 2:8;
the plants on the planting layer are one or a combination of more than one of Iris, iris, reed and pennisetum;
the medium layer is filled with zeolite, and the grain diameter is 2-4mm;
the long-term treatment zone and the real-time treatment zone are filled with gravel and matrix, and the volume ratio is 7:3, a step of; the matrix is pyrite and plant carbon source, and the sulfur-carbon ratio is 0.6;
the particle size of the gravel is 8-20mm, and the plant carbon source is mainly reed scraps.
6. A dual mode bio-retention system according to claim 4 or 5, further comprising: a solar power supply device;
the solar power supply device provides electric energy for the dual-mode bio-retention system.
7. The method for processing a dual-mode bio-retention system according to claim 6, comprising:
1) When CSO does not flow in, the transverse electric door and the longitudinal electric door are both opened; step 1) when CSO does not flow in, mainly treating runoff rainwater, wherein the nitrogen concentration is 5.6-22.4mg/L;
2) When CSO flows in, the first transverse electric door is opened, the second transverse electric door and the longitudinal electric door are closed, and the long-term treatment area is used for treating initial rainwater;
when the water level rises to the height of the water level monitor, a signal is sent, the first transverse electric door is closed, the second transverse electric door is opened, the longitudinal electric door is closed, and the real-time treatment area is used for treating rainwater;
3) The rainfall monitor recognizes the rainfall level and sends out corresponding signals to the signal controller, and the signal controller controls the opening and closing of the small rain drainage end, the medium rain drainage end and the big rain drainage end;
if the rainfall grade is light rain, the electromagnetic valve at the drainage end of the light rain is opened, and the other drainage ends are closed;
if the rainfall grade is medium rain, the electromagnetic valve at the drainage end of the medium rain is opened, and the other drainage ends are closed;
if the rainfall grade is heavy rain or heavy rain, the electromagnetic valve at the drainage end of the heavy rain is opened, and the other drainage ends are closed;
4) After the rainfall stops for at least three days, the rainfall monitor sends out signals again, the transverse electric door and the longitudinal electric door are opened, the electromagnetic valve at the drainage end of the small rain is opened, and other drainage ends are closed.
8. A method of treating a dual mode bio-retention system as claimed in claim 7, wherein,
step 2) when CSO flows in, CSO is treated simultaneously, and the nitrogen concentration is 19.6-41.5mg/L;
the setting standard of the rainfall grade in the step 3) is as follows:
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