CN107244762B - Bridge deck runoff pollution treatment integrated device and treatment method - Google Patents
Bridge deck runoff pollution treatment integrated device and treatment method Download PDFInfo
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- CN107244762B CN107244762B CN201710291368.1A CN201710291368A CN107244762B CN 107244762 B CN107244762 B CN 107244762B CN 201710291368 A CN201710291368 A CN 201710291368A CN 107244762 B CN107244762 B CN 107244762B
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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
- C02F9/00—Multistage treatment of water, waste water or sewage
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D36/00—Filter circuits or combinations of filters with other separating devices
- B01D36/04—Combinations of filters with settling tanks
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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
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/001—Processes for the treatment of water whereby the filtration technique is of importance
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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
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
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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
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/001—Runoff or storm water
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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
- C02F2301/00—General aspects of water treatment
- C02F2301/08—Multistage treatments, e.g. repetition of the same process step under different conditions
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- 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
- Y02W10/30—Wastewater or sewage treatment systems using renewable energies
- Y02W10/37—Wastewater or sewage treatment systems using renewable energies using solar energy
Abstract
A bridge deck runoff pollution treatment integrated device and a treatment method belong to the technical field of sewage treatment. The runoff treatment device integrates a primary sedimentation tank, a flocculation tank and a secondary sedimentation tank, wherein the primary sedimentation tank is positioned at the outermost side of the device, a cylindrical space in the center of the primary sedimentation tank is the flocculation tank and the secondary sedimentation tank, and the flocculation tank is positioned above the secondary sedimentation tank; an overflow groove is arranged between the primary sedimentation tank and the secondary sedimentation tank, and a water outlet which is communicated with the flocculation tank and the secondary sedimentation tank is arranged at the bottom of the flocculation tank. The filter is located at the bottom of the device. The bottom of the device is a waste liquid tank and a sludge temporary storage area. After reforming transform the emergent safe handling pond, the device can dock with it, reform transform the mode and divide into two ponds of size with emergent safe handling pond promptly with a baffle, little pond is used for collecting 30 min's initial runoff before the bridge face, handles by runoff processing apparatus after collecting. The big pond only has the emergent storage function of collecting danger article and reveal. The top of the partition board is provided with an overflow groove, and after the small pool is fully collected, the runoff which continuously flows in overflows into the large pool and is discharged.
Description
Technical Field
The invention relates to an integrated device and a method for treating runoff pollution of a bridge deck, and belongs to the technical field of sewage treatment.
Background
The bridge spans important water body river basin, is an important junction of road traffic. As a carrier for transportation, the bridge deck retains a large amount of pollutants generated by vehicles. These pollutants can pass through the rain and snow runoff and directly enter the water body spanned by the bridge, and even accumulate in farmland near the bridge. The accumulated pollutants on the bridge deck can form pollution risks for the cross-bridge water body, especially the drinking water source protection water body; but also contaminates nearby farmlands, resulting in the accumulation of contaminants on the food chain, creating a risk to human safety. The pollution of bridge deck runoff is more serious in ecologically sensitive areas, and is gradually paid attention in recent years. The research on the pollutant composition in the bridge deck runoff proves that the rainwater at the initial stage of the bridge deck runoff contains more solid suspended matters, COD, ammonia nitrogen, even pollutants such as heavy metals and the like. The pollutants are directly discharged into the receiving water body through precipitation runoff flushing. According to the national standard, bridges crossing over more than three levels of water bodies must be built with emergency safety disposal pools. The function of the system is to collect and store dangerous chemicals after the accident of vehicles for transporting dangerous goods, and prevent the risk of environmental pollution to sensitive water. However, since the emergency disposal pond is only used for emergency collection of dangerous articles of road accidents, the emergency disposal pond has no purification function on the rainwater runoff. According to dangerous goods accident statistics, the emergency disposal pool is low in use frequency, so that resources are wasted and left unused. Therefore, an effective rainwater runoff water treatment device is established on the basis of the emergency safety pool at the bridge section crossing the ecological sensitive area, and the safety pool is added to the rainwater runoff treatment function.
Earlier studies have shown that deck runoff is a source of intermittent emissions that are significantly affected by the region and climate. Runoff rainwater discharge has intermittence, and runoff water yield is influenced by rainfall intensity and rainfall duration. The radial flow rate per formation is also not constant. Heavy storms in summer form a large amount of runoff in a short time, while small storms in spring and autumn generate little runoff, and may not even form runoff. According to the research, the concentration of the deck runoff pollutants has obvious change rules. The runoff pollutant concentration discharged after 30 minutes of rainfall is high. After 30 minutes the contaminant concentration has been substantially below the secondary water standard specified in the surface water environment quality standard (GB 3838-2002). And the initial runoff has a high contribution rate to pollutants, so the initial runoff of the first 30 minutes becomes a key point of treatment. After water quality detection, the bridge deck runoff mainly contains pollutants such as COD, SS, ammonia nitrogen, pb and the like. These water quality and water production characteristics are quite different from municipal and industrial wastewater, and have distinct characteristics. At present, no technology and no method for treating the bridge deck rainwater runoff exist.
The characteristics of bridge floor rainfall runoff put forward stricter requirements for bridge floor runoff treatment. First, the ecologically sensitive area is generally located in the field far from the city, and the manual maintenance is very inconvenient. Thus, the automation of process technology and facilities, as well as the ability to remotely monitor, are critical to solving this problem. Second, bridges in ecologically sensitive areas generally have no available power supply. Thus, the power consumption requirements for the device and the power supply for the device are also a prominent requirement. In addition, there are large areas of rivers and beaches under the bridge, and there is generally no much open space for the construction of the device. Therefore, the treatment equipment constructed by utilizing the accident safety pool is required to be compact in design and easy to install and debug.
In summary, the existing water treatment technical scheme cannot be directly used for treating bridge deck runoff. Technology and integrated equipment for integrally solving runoff pollution based on sensitive water bodies of expressway spans become urgent requirements for current highway environment protection.
Disclosure of Invention
Aiming at the characteristics of the water quality pollutants of the bridge deck runoff and the initial discharge rule, and considering the characteristics of a bridge area, the invention provides an integrated bridge deck runoff treatment technology and device. The treatment technology adopts precipitation, coagulation, precipitation and ion exchange processes, and can realize that the treatment of the runoff of the bridge floor rainwater requires mirror purification. Based on the technology, an accident safety pool arranged on the bridge deck is utilized, and a set of bridge deck runoff collecting and treating integrated device utilizing the safety pool is invented. The technology and the integrated equipment device have compact structure and small occupied area. And an intelligent control and monitoring system is adopted, and solar batteries are used for supplying power, so that collection and treatment of runoff rainwater in the bridge area are realized.
The invention relates to a bridge deck runoff pollution treatment integrated device, which comprises a pollution treatment integrated device as shown in figure 1, wherein the pollution treatment integrated device mainly comprises a water distributor (1), a primary sedimentation tank (2), a flocculation tank (4), a secondary sedimentation tank (8), a filtering device (9) and a solar device (15);
the integral outer layer of the pollution treatment integrated device is an outer cylinder (42), a primary sedimentation tank (2) is arranged at the part, close to the inner side surface, of the inner upper part of the outer cylinder (42), the primary sedimentation tank (2) is of a barrel structure, the primary sedimentation tank (2) comprises a central barrel (18) and a spiral inclined plate (17) arranged on the outer side surface of the central barrel (18), the central barrel (18) is coaxial with the outer cylinder (42), a gap is reserved between the central barrel (18) and the outer cylinder (42), and a plurality of spiral inclined plates (17) are fixed between the central barrel (18) and the gap of the outer cylinder (42) in a layering manner; a gap is arranged between the spiral inclined plates (17); a primary sedimentation tank sludge hopper (11) is arranged below the inner central barrel (18) of the outer cylinder (42), and the large-mouth outer side surface of the primary sedimentation tank sludge hopper (11) is fixed with the inner surface of the outer cylinder (42) in a sealing way; the bottom end of the central barrel (18) is provided with a secondary sedimentation tank sludge funnel (11 '), and the outer side surface of a large mouth of the secondary sedimentation tank sludge funnel (11') is fixed with the inner surface of the central barrel (18) in a sealing way; the secondary sedimentation tank sludge hopper (11') is arranged above the primary sedimentation tank sludge hopper (11); a gap is axially formed between the secondary sedimentation tank sludge hopper (11 ') and the primary sedimentation tank sludge hopper (11), and an annular water distributor (1) is arranged between the gap of the secondary sedimentation tank sludge hopper (11') and the gap of the primary sedimentation tank sludge hopper (11); the centers of the secondary sedimentation tank sludge hopper (11') and the primary sedimentation tank sludge hopper (11) are respectively provided with a sewage outlet which is respectively connected with a sludge temporary storage area (14) through a sludge discharge pipe (12); the upper port barrel wall of the central barrel (18) is provided with a V-shaped overflow groove (3); the upper part of the inner part of the central barrel (18) is provided with a flocculation tank (4); the flocculation tank (4) comprises a barrel partition plate (44), wherein the barrel partition plate (44) is coaxial with the central barrel (18), a gap is formed between the barrel partition plate (44) and the central barrel (18), the lower end of the barrel partition plate (44) is a conical tank bottom (40), the tank bottom (40) is fixed with the inner surface of the central barrel (18) in a sealing way, the lower end surface of the barrel partition plate (44) is fixed with the tank bottom (40) in a sealing way, the lower end of the barrel partition plate (44) is provided with water inlets (25), preferably the water inlets (25) are arched, and a plurality of water inlets (25) are formed, for example, 4 water inlets are formed;
the upper end of the outer cylinder (42) is provided with a bracket (43), the bracket (43) is provided with a motor and a speed reducer (24), the motor and the speed reducer (24) are connected with a stirring shaft (19), the stirring shaft (19) downwards stretches into a barrel partition plate (44), the upper part of the stirring shaft (19) is provided with a frame type stirring paddle (21), and the frame type stirring paddle (21) stretches into a gap between the barrel partition plate (44) and the central barrel (18); the middle and lower parts of the stirring shaft (19) are provided with an intermediate stirring paddle (20), the intermediate stirring paddle (20) is arranged in a barrel partition plate (44), and the lowest end of the stirring shaft (19) is fixed on a pool bottom (40) through a tripod bearing seat (23); a water outlet (26) is arranged in the center of the pool bottom (40); a secondary sedimentation tank (8) is arranged in the tank bottom (40) below the tank bottom (40); the secondary sedimentation tank (8) comprises a spiral inclined plate, a central water pipe and a water distributor (7), wherein the water distributor is arranged at the lower end of the central water pipe, the central water pipe is connected with a water outlet (26), a plurality of spiral inclined plates are spirally distributed and fixed around the central water pipe in a laminated manner, and gaps are formed among the spiral inclined plates; the water distributor is arranged above a secondary sedimentation tank sludge hopper (11'); a filter device (9) is arranged below the primary sedimentation tank sludge hopper (11); the barrel wall of the upper central barrel (18) of the secondary sedimentation tank (8) is provided with a hole which is connected with the filtering device (9) through a pipeline (41); the filtering device (9) is provided with a drain pipe (10) for draining water; the top end of the outer cylinder (42) is provided with a solar device (15), and the solar device (15) is used for providing electric driving force required by operation; a dosing device (6) is also fixed on the bracket for dosing the flocculation tank.
A waste liquid cylinder (13) is arranged below the filtering device (9) and is used for containing waste liquid of back flushing of the filtering device (9); a sludge holding area (14) is also located below the filter device (9).
The bridge deck runoff pollution treatment integrated device also comprises a rain collecting port (28), a transverse water pipe (29), a water main (30) and a collecting and treating system; every other distance sets up one and gathers rain mouth (28) on the bridge floor, every collects rain mouth and is connected with a horizontal water pipe (29), every horizontal water pipe (29) are connected with main (30), main (30) are connected with collection processing system, this collection processing system includes safe pond, safe pond includes little pond (32), big pond (34), adopt the baffle to separate between little pond (32), big pond (34), main (30) are connected with three-way valve (31), other two mouthfuls of three-way valve (31) are connected with little pond (32), big pond (34) respectively, little pond (32) are connected with pollution treatment integrated device (36), the water after the processing is discharged into the river through outlet pipe (10) nearby. The integrated pollution treatment device is also provided with an automatic control device (16), and the automatic control device (16) is used for controlling the operation of the valve, the dosing device (6), the motor and the speed reducer (24).
Because the concentration of the runoff pollutants in the first 30min is higher, and the concentration after 30min is basically lower than the national secondary water standard, the collection and treatment system only collects and treats the initial runoff in the first 30min, and the runoff after 30min can be directly discharged without treatment. The collection and treatment system relies on controlling a three-way valve (31) to intercept deck runoff for the first 30 minutes.
An overflow groove (33) is arranged at the upper part of a partition plate between the small pool (32) and the large pool (34), and an overflow hole (38) is arranged at the upper part of the pool wall of the large pool; the installation plane of the pollution treatment integrated device (36) is 1-2 m lower than the pool of the small pool (32) and is used for generating a certain water head to drive the water flow in the pollution treatment integrated device (36).
The small Chi Famen (35) connects the small tank 32 with the pollution treatment integrated device (36), and the large tank valve (37) is used for draining water in the large tank (34).
The runoff treatment device integrates a primary sedimentation tank, a flocculation tank and a secondary sedimentation tank, wherein the primary sedimentation tank is positioned at the outermost side of the device, a cylindrical space in the center of the primary sedimentation tank is the flocculation tank and the secondary sedimentation tank, and the flocculation tank is positioned above the secondary sedimentation tank; an overflow groove is arranged between the primary sedimentation tank and the secondary sedimentation tank, and a water outlet which is communicated with the flocculation tank and the secondary sedimentation tank is arranged at the bottom of the flocculation tank. The filter is located at the bottom of the device. The bottom of the device is a waste liquid tank and a sludge temporary storage area. After reforming transform the emergent safe handling pond, the device can dock with it, reform transform the mode and divide into two ponds of size with emergent safe handling pond promptly with a baffle, little pond is used for collecting 30 min's initial runoff before the bridge face, handles by runoff processing apparatus after collecting. The big pond only has the emergent storage function of collecting danger article and reveal. The top of the partition board is provided with an overflow groove, and after the small pool is fully collected, the runoff which continuously flows in overflows into the large pool and is discharged.
Drawings
FIG. 1 is a schematic view of a pollution treatment integrated device;
FIG. 2 shows the internal structure of the primary sedimentation tank;
FIG. 3 flocculation basin;
FIG. 4 is a cross-sectional view of a flocculation basin;
FIG. 5 illustrates a flow process of a radial flow treatment device;
FIG. 6 is a device installation diagram;
1 water distributor, 2 primary sedimentation tank, 3V overflow trough, 4 flocculation tank, 5 stirring device, 6 dosing device, 7 central water pipe and water distributor, 8 secondary sedimentation tank, 9 filtering device, 10 drain pipe, 11 primary sedimentation tank sludge hopper, 11' secondary sedimentation tank sludge hopper, 12 sludge discharge pipe, 13 waste liquid cylinder, 14 sludge temporary storage area, 15 solar device, 16 automatic control device, 17 spiral inclined plate, 18 central barrel, 19 stirring shaft, 20 intermediate stirring paddle, 21 frame stirring paddle, 22 coupling, 23 tripod bearing seat, 24 motor and decelerator, 25 water inlet, 26 water outlet, 27 bridge body, 28 rain collecting port, 29 transverse water pipe, 30 total water pipe, 31 three-way valve, 32 small tank, 33 overflow tank, 34 big tank, 35 small tank valve, 36 pollution treatment integrated device, 37 big tank valve, 38 overflow hole, 39 sludge discharge valve, 40 tank bottom, 41 pipeline, 42 outer cylinder, 43 bracket, 44 barrel partition plate.
Detailed Description
The present invention will be further illustrated with reference to the following examples, but the present invention is not limited to the following examples.
Example 1
The device needs to be in butt joint with the safety pool and needs to be improved, and the device and the safety pool form a whole collection and treatment system.
As shown in fig. 1, water enters a primary sedimentation tank 2 from a water inlet pipe and a water distributor 1 for preliminary sedimentation, and the sedimented particles fall into a sludge hopper. Wherein the primary sedimentation tank 2 is cylindrical and is positioned at the outer side of the whole device, and a cylindrical space is reserved in the center of the primary sedimentation tank 2 for the flocculation tank 4 and the secondary sedimentation tank 8; the structure of the primary sedimentation tank 2 is shown in fig. 2, a spiral inclined plate 17 is arranged on a central barrel 18, the area of the sedimentation tank is enlarged by the spiral inclined plate 17, water flow can slowly rise along the spiral inclined plate 17, particles are gradually precipitated on the spiral inclined plate 17, and the spiral slides downwards, so that the space utilization rate of the designed sedimentation tank can reach 100%, the operation is stable, turbulence is rarely generated, and no dead angle of water flow exists;
as shown in figure 1, a V-shaped overflow groove 3 is arranged at the top of the primary sedimentation tank 2, and water overflows into a flocculation tank 4 through the V-shaped overflow groove 3 when reaching the top of the primary sedimentation tank 2. The stirring device 5 and the dosing pump 6 at the top end of the device can continuously work to add the flocculating agent into the water at the outer layer of the flocculation tank 4, so as to realize flocculation stirring. The structure of the flocculation tank 4 is shown in figure 3, the flocculation tank is divided into an inner layer and an outer layer by a cylindrical partition plate, the volume ratio of the inner layer to the outer layer is 2:1, 4 arched water inlets 25 are arranged at the bottom of the partition plate, and water and floccules of the outer layer enter the inner layer through the 4 water inlets 25; the stirring device of the flocculation tank comprises a stirring shaft 19, two inter-type stirring paddles 20, a frame-type stirring paddle 21, a coupler 22, a tripod bearing seat 23, a motor and a speed reducer 24, wherein the frame-type stirring paddles 21 are used for stirring water at the outer layer of the flocculation tank, the two inter-type stirring paddles 20 are used for stirring water at the inner layer of the flocculation tank, and as the inter-type stirring paddles 20 can enable water flow to form axial circulation, floccules can be fully contacted with each other, and the growth of the floccules is promoted; the inner stirring paddles and the outer stirring paddles are coaxial to form a linear speed difference, so that the effects of high stirring intensity of the outer layer and low stirring intensity of the inner layer are achieved, and the flocculation effect is good; the stirring device is driven by only one motor, and a gear train is not needed, so that the stirring device is convenient to control and maintain; the cross section of the flocculation tank body is shown in fig. 5, the bottom of the flocculation tank is conical, the cross section forms a gradient of 10-15 degrees with the horizontal plane, so that the water and the floccule on the outer layer flow into the inner layer, the water outlet 26 is arranged on the cone roof, and the flocculated water and floccule flow out from the water outlet 26.
As shown in fig. 1, after flocculation, water and floccules flow out from a water outlet at the bottom of a flocculation tank together, enter the bottom of a secondary sedimentation tank 8 through a central water pipe and a water distributor 7, slowly rise along an inclined plate in the secondary sedimentation tank 8, gradually precipitate on the inclined plate, and finally slide into a sludge hopper; wherein, the upper end of the central water pipe is connected with the water outlet of the flocculation tank, and the lower end is provided with a water distributor; the upper end of the secondary sedimentation tank 8 is provided with a water outlet which is connected with an external water pipe.
The water precipitated by the secondary sedimentation tank 8 enters the filtering device 9 through an external water pipe, the filtering device 9 is provided with two filtering columns, quartz sand filtering materials are filled in the filtering device 9, one filtering column is commonly used for standby, the filtering device 9 is ensured not to be interrupted to work due to the blocking of the filtering materials, and the water is discharged from the water discharge pipe 10 after being treated by the filtering device 9; the filtering device 9 is provided with matched back flushing equipment, when one filtering column is fully loaded, back flushing is needed, a back flushing pump is started, clear water is used for back flushing, waste water produced by back flushing is discharged to the waste liquid tank 13, and the filtering column can be used continuously after back flushing is completed.
The bottom of primary sedimentation tank and secondary sedimentation tank is equipped with the sludge bucket, and two conical sludge buckets are placed with one heart, but have sufficient interval from top to bottom, and upper portion little sludge bucket is used for collecting the flocculating constituent that secondary sedimentation tank 8 subsided, and lower part big sludge bucket is used for collecting the big granule mud that can subside by oneself of primary sedimentation tank 2, and the mud pipe 12 has two, and the mud of two sludge buckets is discharged respectively, and through the periodic mud discharge of mud valve, the mud of discharge goes out to have the mud temporary storage 14 of device bottom.
The energy source of the device is provided by solar cells 15 mounted on top of the device, and the control of the device is accomplished by autonomous means 16.
After the whole treatment process, the water quality of the effluent of the device can reach the national second-level water standard.
The water flow process of the device is shown by the arrows in fig. 5.
As shown in fig. 1, an annular bracket is arranged at the top of the device, and a dosing device 6 comprising a liquid medicine tank and a dosing pump is arranged on the bracket; the dosing device 6 is positioned above the flocculation tank 4, a turbidity meter is arranged on the horizontal plane at the top end of the primary sedimentation tank 2, the turbidity of the primary sedimentation water, namely the turbidity of the water entering the flocculation tank is measured, a flowmeter is arranged at the water inlet pipe 1, and the water inlet flow of the device is monitored. The dosing mode adopts a wet dosing method, 15% PAC solution and 2% PAM solution are prepared in advance and are placed in a medicine storage tank. The control of the dosing device is also completed by the automatic control device, the flow rate of the dosing pump is related to the turbidity, after experimental optimization, the relation between the turbidity of the inlet water of the flocculation tank and the dosage of the flocculant is obtained after fitting and calculation, the relation between the flow rate of the dosing pump and the turbidity and the inlet water flow rate is that
Q PAC ＝Q·(273.89T+3.23)×10 -4 [mL/min]
Q PAM ＝Q·(2.42T+192.08)×10 -6 [mL/min]
Wherein Q is PAC Flow rate of PAC solution, Q PAM The flow rate of PAM solution is unit mL/min; q is the water inflow rate of the device, and the unit is L/h; t is the turbidity of the inlet water of the flocculation tank and is the unit NTU.
As shown in FIG. 6, the installation diagram of the device is shown as a bridge body 27, a rain collecting opening 28 is arranged on the bridge deck at intervals, water flowing into the rain collecting opening enters a transverse water pipe 29 and then enters a collecting and treating system through a water main pipe 30, the collecting and treating system mainly comprises a small pool 32, a large pool 34 and a bridge deck runoff treating device 36, and the treated water is nearly discharged into a river through a water outlet pipe 10;
because the concentration of the runoff pollutants in the first 30min is higher, and the concentration after 30min is basically lower than the national secondary water standard, the collection and treatment system only collects and treats the initial runoff in the first 30min, and the runoff after 30min can be directly discharged without treatment. The collection and treatment system is used for intercepting bridge deck runoff of the front 30min by controlling the three-way valve 31, and consists of a safety pool and a runoff treatment device 36, wherein a partition plate is arranged in the safety pool, the safety pool is divided into a small pool 32 and a large pool 34, the small pool 32 is used for collecting initial runoffs of the front 30min of the bridge deck, the large pool 34 is the part of the safety pool left after a part of space is divided by the small pool 32, the safety pool does not have the function of collecting runoffs at ordinary times, and the safety pool is only used as an emergency safety disposal pool when dangerous chemical transport vehicle accidents occur.
The upper part of the partition plate is provided with an overflow groove 33, and the upper part of the pool wall of the large pool is provided with an overflow hole 38; the installation plane of the pollution treatment integrated device 36 is 1-2 m lower than the bottom of the safety small pool 32, and is used for generating a certain water head to drive water flow in the pollution treatment integrated device 36;
the working process of the system is as follows: when rainfall occurs, the runoff flows into the rain collecting port 28 and then enters the collecting and treating system through the transverse water pipe 29 and the water main 30; the three-way valve 31 is used for completely connecting the water in the water main 30 into the small pool 32 for the first 30 min; after 30min, the three-way valve 31 connects all the water in the water main 30 into the big pool 34, and then the water is discharged from the big pool valve 37 and is discharged into the river nearby; if the water volume is too large to drain, excess water flows out of the overflow holes 38, preventing the water level from becoming too high. After the rainfall is finished, the small pool valve 35 is opened, water waiting to be treated in the small pool 32 enters the pollution treatment integrated device 36, and the treated water is discharged from the water outlet pipe 10 of the pollution treatment integrated device 36 and is discharged into a river nearby. The bottoms of the small tank 32 and the large tank 34 may have sludge, so that it is necessary to provide a sludge tank, and to periodically discharge the sludge, the sludge discharge valve 39 is opened to discharge the sludge into the sludge tank.
The system is based on a secure pool design, and still retains the functionality of the secure pool. The system needs to design a remote alarm system, and once dangerous chemicals leak due to traffic accidents, an alarm is triggered, all valves including a small pool valve 35, a large pool valve 37 and a mud valve 39 are automatically closed, and the valves can not be opened until the danger is eliminated.
Taking bridge deck sediment of a certain bridge to distribute water, and building a set of small test device to simulate the technological process of an actual runoff treatment device; experiments show that 66% of COD can be removed by primary sedimentation, but a part of COD is still attached to the colloid and cannot be removed by primary sedimentation; flocculation is carried out after primary sedimentation, and the removal rate of COD reaches 89%; finally, after filtration, the COD concentration of the effluent is lower than the first-level discharge standard of the urban secondary sewage treatment plant specified in the comprehensive sewage discharge standard (GB 8978-1996), and the removal rate of COD is 92%.
Claims (5)
1. The method for treating by adopting the bridge deck runoff pollution treatment integrated device is characterized in that the pollution treatment integrated device mainly comprises a water distributor (1), a primary sedimentation tank (2), a flocculation tank (4), a secondary sedimentation tank (8), a filtering device (9) and a solar device (15);
the integral outer layer of the pollution treatment integrated device is an outer cylinder (42), a primary sedimentation tank (2) is arranged at the part, close to the inner side surface, of the inner upper part of the outer cylinder (42), the primary sedimentation tank (2) is of a barrel-shaped structure, the primary sedimentation tank (2) comprises a central barrel (18) and a spiral inclined plate (17) arranged on the outer side surface of the central barrel (18), the central barrel (18) is coaxial with the outer cylinder (42), a gap is reserved between the central barrel (18) and the outer cylinder (42), and a plurality of spiral inclined plates (17) are fixed between the central barrel (18) and the gap of the outer cylinder (42) in a layering mode; a gap is arranged between the spiral inclined plates (17); a primary sedimentation tank sludge hopper (11) is arranged below the inner central barrel (18) of the outer cylinder (42), and the large-mouth outer side surface of the primary sedimentation tank sludge hopper (11) is fixed with the inner surface of the outer cylinder (42) in a sealing way; the bottom end of the central barrel (18) is provided with a secondary sedimentation tank sludge funnel (11 '), and the outer side surface of a large mouth of the secondary sedimentation tank sludge funnel (11') is fixed with the inner surface of the central barrel (18) in a sealing way; the secondary sedimentation tank sludge hopper (11') is arranged above the primary sedimentation tank sludge hopper (11); a gap is axially formed between the secondary sedimentation tank sludge hopper (11 ') and the primary sedimentation tank sludge hopper (11), and an annular water distributor (1) is arranged between the gap of the secondary sedimentation tank sludge hopper (11') and the gap of the primary sedimentation tank sludge hopper (11); the centers of the secondary sedimentation tank sludge hopper (11') and the primary sedimentation tank sludge hopper (11) are respectively provided with a sewage outlet which is respectively connected with a sludge temporary storage area (14) through a sludge discharge pipe (12); the upper port barrel wall of the central barrel (18) is provided with a V-shaped overflow groove (3); the upper part of the inner part of the central barrel (18) is provided with a flocculation tank (4); the flocculation tank (4) comprises a barrel partition plate (44), wherein the barrel partition plate (44) is coaxial with the central barrel (18), a gap is formed between the barrel partition plate (44) and the central barrel (18), the lower end of the barrel partition plate (44) is a conical tank bottom (40), the tank bottom (40) is fixed with the inner surface of the central barrel (18) in a sealing way, the lower end surface of the barrel partition plate (44) is fixed with the tank bottom (40) in a sealing way, and the lower end of the barrel partition plate (44) is provided with a water inlet (25);
the upper end of the outer cylinder (42) is provided with a bracket (43), the bracket (43) is provided with a motor and a speed reducer (24), the motor and the speed reducer (24) are connected with a stirring shaft (19), the stirring shaft (19) downwards stretches into a barrel partition plate (44), the upper part of the stirring shaft (19) is provided with a frame type stirring paddle (21), and the frame type stirring paddle (21) stretches into a gap between the barrel partition plate (44) and the central barrel (18); the middle and lower parts of the stirring shaft (19) are provided with an intermediate stirring paddle (20), the intermediate stirring paddle (20) is arranged in a barrel partition plate (44), and the lowest end of the stirring shaft (19) is fixed on a pool bottom (40) through a tripod bearing seat (23); a water outlet (26) is arranged in the center of the pool bottom (40); a secondary sedimentation tank (8) is arranged in the tank bottom (40) below the tank bottom (40); the secondary sedimentation tank (8) comprises a spiral inclined plate, a central water pipe and a water distributor, the lower end of the central water pipe is the water distributor, the central water pipe is connected with a water outlet (26), a plurality of spiral inclined plates are spirally laminated and fixed on the periphery of the central water pipe, and gaps are formed among the spiral inclined plates; the water distributor is arranged above a secondary sedimentation tank sludge hopper (11'); a filter device (9) is arranged below the primary sedimentation tank sludge hopper (11); the barrel wall of the upper central barrel (18) of the secondary sedimentation tank (8) is provided with a hole which is connected with the filtering device (9) through a pipeline (41); the filtering device (9) is provided with a drain pipe (10) for draining water; the top end of the outer cylinder (42) is provided with a solar device (15), and the solar device (15) is used for providing electric driving force required by operation; a dosing device (6) is also fixed on the bracket and used for dosing the flocculation tank;
the bridge deck runoff pollution treatment integrated device also comprises a rain collecting port (28), a transverse water pipe (29), a water main (30) and a collecting and treating system; a rain collecting opening (28) is arranged on the bridge deck at intervals, each rain collecting opening is connected with a transverse water pipe (29), each transverse water pipe (29) is connected with a water main (30), the water main (30) is connected with a collecting and treating system, the collecting and treating system comprises a safety pool, the safety pool comprises a small pool (32) and a large pool (34), the small pool (32) and the large pool (34) are separated by a partition plate, the water main (30) is connected with a three-way valve (31), the other two openings of the three-way valve (31) are respectively connected with the small pool (32) and the large pool (34), water in the large pool (34) is discharged into a river through a large pool valve (37), the small pool (32) is connected with a pollution treating integrated device (36) through a small Chi Famen (35), and the treated water is discharged into the river nearby through a drain pipe (10);
the water enters a primary sedimentation tank (2) from a water inlet pipe and a water distributor (1) for preliminary sedimentation, and the sedimented particles fall into a sludge hopper; wherein the primary sedimentation tank (2) is cylindrical and is positioned at the outer side of the whole device, and a cylindrical space is reserved in the center of the primary sedimentation tank for the flocculation tank (4) and the secondary sedimentation tank (8); structure of primary sedimentation tank (2): the spiral inclined plate (17) is arranged on the central barrel (18), the area of the sedimentation tank is enlarged by the spiral inclined plate (17), water flow can slowly rise along the spiral inclined plate (17), particles are gradually precipitated on the spiral inclined plate (17), and the spiral slides downwards, so that the space utilization rate of the designed sedimentation tank can reach 100%, the sedimentation tank runs stably, turbulence is rarely generated, and no dead angle of water flow exists;
the top of the primary sedimentation tank (2) is provided with a V-shaped overflow groove (3), and water overflows into a flocculation tank (4) through the V-shaped overflow groove (3) when reaching the top of the primary sedimentation tank (2); the stirring device (5) and the dosing device (6) at the top end of the device can continuously work, and a flocculating agent is added into water at the outer layer of the flocculation tank (4) to realize flocculation stirring; wherein, flocculation tank (4): the inner layer and the outer layer are divided by a cylindrical partition board, the volume ratio of the inner layer to the outer layer is 2:1, 4 arched water inlets (25) are formed in the bottom of the partition board, and water and floccules of the outer layer enter the inner layer through the 4 water inlets (25); the stirring device of the flocculation tank comprises a stirring shaft (19), two inter-type stirring paddles (20), a frame-type stirring paddle (21), a coupler (22), a tripod bearing seat (23), a motor and a speed reducer (24), wherein the frame-type stirring paddles (21) are used for stirring water at the outer layer of the flocculation tank, the two inter-type stirring paddles are used for stirring water at the inner layer of the flocculation tank, and because the inter-type stirring paddles (20) can enable water flow to form axial circulation, flocculating bodies can be fully contacted with each other to promote the growth of the flocculating bodies; the inner stirring paddles and the outer stirring paddles are coaxial to form a linear speed difference, so that the effects of high stirring intensity of the outer layer and low stirring intensity of the inner layer are achieved, and the flocculation effect is good; the stirring device is driven by only one motor, and a gear train is not needed, so that the stirring device is convenient to control and maintain; section of flocculation tank body: the bottom of the pool is conical, the section of the pool forms a gradient of 10-15 degrees with the horizontal plane, so that water and floccules on the outer layer can flow into the inner layer conveniently, a water outlet (26) is formed in the top of the cone, and the flocculated water and floccules flow out from the water outlet (26);
after flocculation, water and floccules flow out from a water outlet at the bottom of the flocculation tank, enter the bottom of a secondary sedimentation tank (8) through a central water pipe and a water distributor, slowly rise along an inclined plate in the secondary sedimentation tank (8), gradually precipitate on the inclined plate, and finally slide into a sludge hopper; wherein, the upper end of the central water pipe is connected with the water outlet of the flocculation tank, and the lower end is provided with a water distributor; the upper end of the secondary sedimentation tank is provided with a water outlet which is connected with an external water pipe;
the specific method comprises the following steps: because the concentration of the runoff pollutants in the first 30 minutes is higher, and the concentration after 30 minutes is basically lower than the national secondary water standard, the collecting and treating system only collects and treats the initial runoff in the first 30 minutes, and the runoff after 30 minutes is directly discharged without treatment; the collection and treatment system relies on controlling a three-way valve (31) to intercept deck runoff for the first 30 minutes.
2. A method according to claim 1, characterized in that a waste liquid tank (13) is arranged below the filter device (9) for containing waste liquid from the back flushing of the filter device (9); a sludge holding area (14) is also located below the filter device (9).
3. A method according to claim 1, characterized in that the water inlet (25) is arched, having a plurality of water inlets (25).
4. A method according to claim 1, characterized in that the integrated pollution treatment device is further provided with an automatic control device (16), the automatic control device (16) being arranged to control the operation of the valve, the dosing device (6), the motor and the decelerator (24).
5. The method according to claim 1, characterized in that an overflow trough (33) is arranged at the upper part of the partition between the small pool (32) and the large pool (34), and an overflow hole (38) is arranged at the upper part of the pool wall of the large pool; the installation plane of the pollution treatment integrated device (36) is 1-2 m lower than the pool of the small pool (32) to generate a certain water head so as to drive the water flow in the pollution treatment integrated device (36).
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| CN201710291368.1A CN107244762B (en) | 2017-04-28 | 2017-04-28 | Bridge deck runoff pollution treatment integrated device and treatment method |
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| CN2404876Y (en) * | 1999-09-10 | 2000-11-08 | 舒城维尔舒环保设备有限公司 | Container type equipment for automatic and high efficiency wastewater treatment |
| CN102001769A (en) * | 2010-11-23 | 2011-04-06 | 西安建筑科技大学 | Integrated water purifying and processing equipment |
| CN103437281A (en) * | 2013-07-24 | 2013-12-11 | 湖南省交通科学研究院 | Bridge deck runoff collection treatment and emergency system |
| CN204939181U (en) * | 2015-05-20 | 2016-01-06 | 天紫环保投资控股有限公司 | A kind of comprehensive sewage treatment system |
| CN206985883U (en) * | 2017-04-28 | 2018-02-09 | 北京工业大学 | Deck runoff pollution processing integrated apparatus |
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Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2404876Y (en) * | 1999-09-10 | 2000-11-08 | 舒城维尔舒环保设备有限公司 | Container type equipment for automatic and high efficiency wastewater treatment |
| CN102001769A (en) * | 2010-11-23 | 2011-04-06 | 西安建筑科技大学 | Integrated water purifying and processing equipment |
| CN103437281A (en) * | 2013-07-24 | 2013-12-11 | 湖南省交通科学研究院 | Bridge deck runoff collection treatment and emergency system |
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