CN109865348B - Multistage sedimentation wastewater circulation car washing system and car washing wastewater treatment method - Google Patents
Multistage sedimentation wastewater circulation car washing system and car washing wastewater treatment method Download PDFInfo
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- 238000004062 sedimentation Methods 0.000 title claims abstract description 253
- 239000002351 wastewater Substances 0.000 title claims abstract description 111
- 238000005406 washing Methods 0.000 title claims abstract description 78
- 238000004065 wastewater treatment Methods 0.000 title claims abstract description 11
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 355
- 238000000034 method Methods 0.000 claims abstract description 24
- 238000004064 recycling Methods 0.000 claims abstract description 15
- 239000007788 liquid Substances 0.000 claims description 26
- 238000001914 filtration Methods 0.000 claims description 19
- 238000003860 storage Methods 0.000 claims description 17
- 239000012535 impurity Substances 0.000 abstract description 56
- 230000008569 process Effects 0.000 abstract description 12
- 239000010419 fine particle Substances 0.000 abstract description 3
- 239000002245 particle Substances 0.000 description 26
- 239000013049 sediment Substances 0.000 description 23
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- 230000004048 modification Effects 0.000 description 5
- 238000012986 modification Methods 0.000 description 5
- 238000011084 recovery Methods 0.000 description 5
- 238000004140 cleaning Methods 0.000 description 4
- 230000005484 gravity Effects 0.000 description 4
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- 238000011161 development Methods 0.000 description 3
- 230000002349 favourable effect Effects 0.000 description 3
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- 238000010586 diagram Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 239000003973 paint Substances 0.000 description 2
- 238000000746 purification Methods 0.000 description 2
- 239000008213 purified water Substances 0.000 description 2
- 230000002776 aggregation Effects 0.000 description 1
- 238000004220 aggregation Methods 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
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- 238000002474 experimental method Methods 0.000 description 1
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- 239000006260 foam Substances 0.000 description 1
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- 238000004519 manufacturing process Methods 0.000 description 1
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Abstract
The invention discloses a multistage sedimentation wastewater circulation car washing system and a car washing wastewater treatment method, and belongs to the field of car washing wastewater recycling. The sedimentation unit in the multistage sedimentation wastewater circulation car washing system comprises a first-stage sedimentation water tank and a second-stage sedimentation water tank, wherein vortex blades and water intakes eccentrically and liftably arranged in the sedimentation water tanks, and the targeted removal of impurities, especially fine particle impurities, can be realized through the differential arrangement of the sizes of the first-stage sedimentation water tank and the second-stage sedimentation water tank and the differential arrangement of water intaking positions; in addition, the car washing wastewater treatment method realizes the advanced treatment of wastewater through the differential arrangement of the vortex rotation speeds in the primary sedimentation process and the secondary sedimentation process.
Description
Technical Field
The invention relates to the technical field of car washing wastewater recycling, in particular to a multistage sedimentation wastewater recycling car washing system and a car washing wastewater treatment method.
Background
With the continuous development of social economy, automobiles become vehicles for people to go out, the quantity of the vehicles kept by Chinese citizens is rapidly increased, and carwash becomes a necessary thing for a family of cars, and a part of car users select to wash the cars by themselves, but the car wash mode is time-consuming and laborious; in addition, many automobile users choose to put the automobile into a car washing shop for washing; with the continuous development and perfection of intelligent automation technology in recent years, self-service car washing equipment like an automatic car washer appears in many cities, and the car washing mode is convenient to wash, high in efficiency and low in cost and is favored by wide automobile users.
Whether the vehicle is cleaned in a carwash shop or an automatic car washer, a large amount of water resources are consumed in the car washing process, and particularly when the automatic car washer is used for cleaning, the mechanical cleaning is adopted, so that the car is cleaned more cleanly, and enough water quantity is required to be ensured for cleaning the car; in addition, the automatic car washer is arranged outdoors, and water source is precious, so that how to save water is a problem to be considered in the car washing process. At present, waste water recovery systems are arranged in a plurality of carwashes and automatic car washes, and waste water after the car washing is finished can be treated and reused through the waste water recovery systems. Although the current wastewater recovery system can primarily purify wastewater through traditional gravity sedimentation, filtration and other modes, the wastewater recovery system also has more problems, on one hand, the traditional treatment mode needs to consume longer time, and every time the car washing is in a peak period, the car washing shop or the automatic car washing machine works fast, the wastewater recovery system cannot timely and effectively treat the wastewater, and a large amount of supplementing water is needed to be additionally added at the moment, so that the water saving effect is very limited.
Based on the above problems, the applicant improves the existing car washing wastewater circulating device and applies for related patents (patent name: a car washing system for circulating water, application number: 201920361696.9, application date: 2019-03-20), the application uses vortex to promote rapid sedimentation of impurities in the center of a water body, so as to improve the sedimentation rate of impurities in wastewater, thereby improving the treatment rate of the wastewater treatment device, further improving the recycling rate of wastewater, realizing real water saving, and greatly improving the impurity removal effect compared with the traditional gravity sedimentation. However, the applicant has found that small particle impurities in water treated in this way are still not removed well.
In the sedimentation process of the car washing wastewater, because some impurities with smaller density and volume are less in stress and are not easy to deposit at the bottom, a large amount of fine impurity particles still remain in the sedimentated water, and the water containing the fine impurity particles can cause the blockage of the filter device after passing through the filter device for a long time, so that the filtration efficiency of the filter device in unit time can be influenced, and the filtration effect of the filter device can be influenced; part of fine particle impurities still remain in the treated water, and the water is returned for use, so that devices such as a car washing pipeline, a spray head and the like are damaged; and the paint surface of the vehicle is easy to be damaged in the cleaning process.
The patent name is searched: the car washing wastewater circulation system (application number: 201510905890.5, application date: 2015-12-07) sequentially comprises a lane diversion device, a collecting and standing system, a primary water purification and filtration system, a medium-grade water purification and filtration system, a final purified water production system and a backwater circulation system; the wastewater is purified and reused through sedimentation and three-stage filtration treatment; the application can improve the treatment effect of wastewater to a certain extent, but the technical scheme of the application has more links to the wastewater treatment process, and the treatment efficiency of wastewater is limited to a certain extent.
Disclosure of Invention
1. Technical problem to be solved by the invention
The invention aims at solving the problem that the impurity removal effect, especially the small particle impurity removal effect, is poor in the existing carwash wastewater circulation treatment process, and provides a multistage sedimentation wastewater circulation car washing system and a car washing wastewater treatment method, wherein the multistage sedimentation wastewater circulation car washing system can deeply sediment wastewater by arranging two sedimentation water tanks capable of generating vortexes, and the wastewater treated by the circulation car washing system has less impurity content; according to the car washing wastewater treatment method, the wastewater is subjected to sedimentation treatment in two stages of different eddies, so that impurities in the treated water are greatly reduced.
2. Technical proposal
In order to achieve the above purpose, the technical scheme provided by the invention is as follows:
the invention relates to a multistage sedimentation wastewater circulation car washing system which comprises a car washing table, a water collecting tank, a sedimentation unit, a water storage tank and a nozzle, wherein the water collecting tank is arranged below the car washing table and is communicated to the sedimentation unit through a pipeline; the sedimentation unit comprises a first-stage sedimentation water tank and a second-stage sedimentation water tank; the center of the bottom of the primary sedimentation water tank is provided with a first vortex blade, and a first water taking device is eccentrically arranged in the primary sedimentation water tank in a liftable manner; the center of the bottom of the secondary sedimentation water tank is provided with a second vortex blade, a second water taking device is eccentrically arranged in the secondary sedimentation water tank in a lifting manner, a water inlet of the primary sedimentation water tank is connected with a water collecting tank, and a water inlet of the secondary sedimentation water tank is connected with the first water taking device through a pipeline; the inner diameter of the first-stage sedimentation water tank is larger than that of the second-stage sedimentation water tank; the second water intake device is connected with the water inlet of the water storage tank through a filter, and the water outlet of the water storage tank is connected with the nozzle through a pipeline.
Preferably, the primary sedimentation water tank and the secondary sedimentation water tank are round barrels, the inner radius of the barrel of the primary sedimentation water tank is R1, the inner radius of the barrel of the secondary sedimentation water tank is R2, and R1=k 1 R2, wherein 1.5.ltoreq.k 1 ≤3。
Preferably, the primary sedimentation water tank is a round barrel, the inner radius of the barrel of the primary sedimentation water tank is R1, the distance from the first water collector to the central axis of the primary sedimentation water tank is D1, and D1=k 2 R1, wherein 0.50.ltoreq.k 2 ≤0.70。
Preferably, the secondary sedimentation water tank is a round barrel, the inner radius of the barrel of the secondary sedimentation water tank is R2, the distance from the second water collector to the central axis of the secondary sedimentation water tank is D2, and D2=k 3 R2, wherein 0.65.ltoreq.k 3 ≤0.90。
Preferably, the first water collector and the second water collector are provided with water collecting lifting rods, and the water collecting lifting rods are used for adjusting the heights of the first water collector and the second water collector.
Preferably, the primary sedimentation water tank and the secondary sedimentation water tank are provided with liquid level meters, and the liquid level meters are used for detecting the water level heights in the primary sedimentation water tank and the secondary sedimentation water tank; the liquid level meter is electrically connected with the water taking lifting rod through the controller.
The carwash system used in the treatment method is the multistage sedimentation wastewater circulation carwash system; firstly, carrying out primary sedimentation on the collected car washing wastewater in a low-speed vortex; secondly, carrying out secondary sedimentation on the car washing wastewater subjected to primary sedimentation in a high-speed vortex; and filtering and recycling the wastewater after the secondary sedimentation.
Preferably, the specific steps are as follows:
step one, first-stage sedimentation
Placing the collected car washing wastewater into a first-stage sedimentation water tank, and carrying out first-stage sedimentation by generating vortex through rotation of a first vortex blade; after primary sedimentation, water is taken from the eccentric position of the primary sedimentation water tank through a first water taking device;
step two, secondary sedimentation
Placing the wastewater subjected to primary sedimentation in a secondary sedimentation water tank with the inner diameter smaller than that of the primary sedimentation water tank, generating vortex through rotation of a second vortex blade to carry out secondary sedimentation, wherein the rotation speed of the second vortex blade is larger than that of the first vortex blade; taking water at the eccentric position of the secondary sedimentation water tank through a second water taking device after secondary sedimentation;
step three, filtering and recycling
And (3) introducing the wastewater subjected to secondary sedimentation into a filter for filtering, and recycling after filtering.
Preferably, the liquid level of the wastewater in the primary sedimentation water tank is H1, and the liquid level of the wastewater from the water taking position of the first water taking device to the primary sedimentation water tank is H1, wherein h1=k 4 H1, k is controlled to be more than or equal to 0.2 during primary sedimentation 4 Less than or equal to 0.4; the liquid level of the wastewater in the secondary sedimentation water tank is H2, the liquid level of the wastewater from the water taking position of the second water taking device to the secondary sedimentation water tank is H2, and h2=k 5 H2, k is controlled to be more than or equal to 0.3 during secondary sedimentation 5 ≤0.6。
Preferably, the first swirl vane rotates at a speed of n1 and the second swirl vane rotates at a speed of n2, n2=k 6 n1, controlling k to be more than or equal to 2 during secondary sedimentation 6 ＜3.5。
3. Advantageous effects
Compared with the prior art, the technical scheme provided by the invention has the following remarkable effects:
(1) The invention relates to a multistage sedimentation wastewater circulation car washing system which comprises a car washing table, a water collecting tank, a sedimentation unit, a water storage tank and a nozzle, wherein the water collecting tank is arranged below the car washing table and is communicated to the sedimentation unit through a pipeline; the sedimentation unit comprises a first-stage sedimentation water tank and a second-stage sedimentation water tank, vortex blades and vortex blades are arranged in the two sedimentation water tanks, and water intakes are eccentrically and liftably arranged in the two sedimentation water tanks; the water inlet of the first-stage sedimentation water tank is connected with the water collecting tank, and the water inlet of the second-stage sedimentation water tank is connected with the water taking device of the first-stage sedimentation water tank through a pipeline; the inner diameter of the first-stage sedimentation water tank is larger than that of the second-stage sedimentation water tank; the second water taking device is connected with a water inlet of the water storage tank through a filter, and a water outlet of the water storage tank is connected with the nozzle through a pipeline; the primary sedimentation water tank removes large-particle impurities in the wastewater, the secondary sedimentation water tank removes fine-particle impurities in the wastewater in a targeted manner, and the removal effect of carwash wastewater impurities is improved.
(2) The carwash system used in the treatment method is the multistage sedimentation wastewater circulation carwash system; firstly, carrying out primary sedimentation on the collected car washing wastewater in a low-speed vortex; secondly, carrying out secondary sedimentation on the car washing wastewater subjected to primary sedimentation in a high-speed vortex; filtering and recycling the wastewater after the secondary sedimentation; the large-particle impurities in the car washing wastewater are removed through the low-speed vortex of the primary sedimentation, and the small-particle impurities in the car washing wastewater are removed in a targeted mode through the high-speed vortex of the secondary sedimentation, so that the removal effect of the car washing wastewater impurities is improved.
Drawings
FIG. 1 is a schematic diagram of a multistage sedimentation wastewater circulation car washing system of the present invention;
FIG. 2 is a schematic diagram of a sedimentation unit in a multistage sedimentation wastewater circulation car washing system.
Reference numerals in the schematic drawings illustrate:
100. a car washing table; 200. a water collection tank;
300. a sedimentation unit; 331. a water intake lifting rod; 340. a liquid level gauge; 350. a sediment extractor; 351. pumping out sediment to remove the lifting rod; 352. a pumping tube; 353. sediment pumping pumps;
311. a first-stage sedimentation water tank; 312. a secondary sedimentation tank; 321. a first swirl vane; 322. a second swirl vane; 332. a first water intake; 333. a second water intake device;
400. a filter; 500. a water storage tank; 510. a heater; 600. a nozzle; 700. an automobile.
Detailed Description
For a further understanding of the present invention, the present invention will be described in detail with reference to the drawings and examples.
The structures, proportions, sizes, etc. shown in the drawings are shown only in connection with the present disclosure, and are not intended to limit the scope of the invention, since any modification, variation in proportions, or adjustment of the size, etc. of the structures, proportions, etc. should be considered as falling within the spirit and scope of the invention, without affecting the effect or achievement of the objective. Meanwhile, the terms such as "upper", "lower", "left", "right", "middle" and the like are also used in the present specification for convenience of description, and are not intended to limit the scope of the present invention, but the changes or modifications of the relative relationship thereof are also regarded as the scope of the present invention which can be implemented without substantial modification to the technical content; in addition, the embodiments of the present invention are not independent of each other, but may be combined.
Example 1
As shown in fig. 1 to 2, a multistage sedimentation wastewater circulation car washing system of the present embodiment includes a car washing table 100, a water collection tank 200, a sedimentation unit 300, a water storage tank 500, and a nozzle 600; the car 700 is placed above the car washing stand 100 for washing, and a large amount of waste water is generated during the washing process. A water collection tank 200 is provided below the car washing table 100, and wastewater generated during car washing falls into the water collection tank 200 to be collected. The water collection tank 200 is communicated to the sedimentation unit 300 through a pipe, and the waste water collected in the water collection tank 200 flows into the sedimentation unit 300 through the pipe under the action of gravity, or a water suction pump is arranged on the pipe between the water collection tank 200 and the sedimentation unit 300, so that the waste water collected in the water collection tank 200 is directly sucked into the sedimentation unit 300.
The sedimentation unit 300 comprises a primary sedimentation water tank 311 and a secondary sedimentation water tank 312, wherein a water inlet of the primary sedimentation water tank 311 is connected with the water collection tank 200; in the embodiment, the water inlet of the first-stage sedimentation water tank 311 is arranged at the bottom of the first-stage sedimentation water tank 311, and the water collecting tank 200 is connected with the water inlet at the bottom of the first-stage sedimentation water tank 311 through a pipeline, so that the wastewater in the water collecting tank 200 can be introduced into the first-stage sedimentation water tank 311 from the bottom of the first-stage sedimentation water tank 311; if wastewater is introduced into the settling tank 310 from the upper or middle portion of the primary settling tank 311, the wastewater may have a lengthy settling process in the water, which is disadvantageous for the subsequent extraction of purified water.
The centers of the bottoms of the first-stage sedimentation water tank 311 and the second-stage sedimentation water tank 312 are respectively provided with a first vortex blade 321 and a second vortex blade 322, the first vortex blade 321 and the second vortex blade 322 are respectively driven by different motors, and after the motors drive the vortex blades to rotate, wastewater in the sedimentation water tank is driven to rotate, so that a vortex is rapidly generated in the sedimentation water tank, impurities in the wastewater can be gathered towards the center of the vortex due to smaller pressure in the center of the vortex, and at the moment, the water in the sedimentation water tank far away from the center area of the vortex can be cleaner; in addition, foam on the water surface can be concentrated in a central area, so that subsequent water taking is facilitated. The vortex blades generate vortex in the sedimentation water tank, so that local aggregation of impurities in the wastewater can be realized rapidly, the sedimentation treatment rate of the wastewater is improved, and delay of car washing time caused by slow sedimentation of the wastewater is avoided, thereby further promoting recycling of the wastewater.
The inner diameter of the further primary settling water tank 311 is larger than the inner diameter of the secondary settling water tank 312; the primary sedimentation water tank 311 and the secondary sedimentation water tank 312 are both round barrels, the barrel inner radius of the primary sedimentation water tank 311 is R1, the barrel inner radius of the secondary sedimentation water tank 312 is R2, and r1=k 1 R2, where k 1 The value range of (2) is 1.5-k 1 Not more than 3, in this example k 1 =2. The applicant has previously applied the swirl sedimentation method to the treatment cycle of car wash wastewater, and although the treatment efficiency is high and the impurity content of the treated wastewater is greatly reduced compared with the conventional gravity sedimentation method, the applicant has found that some impurities, especially small particle impurities, still exist in the treated water, and the small particle impurities have great harm both during the wastewater treatment cycle and during the car wash process. The applicant has made further improvements to the sedimentation unit 300 by adding an identical sedimentation tank to the original sedimentation tank, and experiments have found that the impurity content in the wastewater treated in this way is further reduced to a certain extent, but the reduction is very small, and basically the further removal of large particle impurities in the wastewater, some small particle impurities remain in the treated wastewater, which leads toThe applicant feels very confused. Later, during a test, the applicant did not want to add a settling tank with a smaller internal diameter to the settling tank, and then the applicant did not find that the impurities in the water obtained by the treatment with the device described above were significantly reduced, in particular the amount of small-particle impurities was significantly reduced.
For the above findings, the applicant has made further improvement design based on this, and through many studies, it is considered that the sedimentation behavior exhibited by impurities of different particle sizes in the vortex is also different, for example, in the primary sedimentation tank 311 with a larger inner diameter, the impurities of large particles are well sedimented in the central part of the vortex of the primary sedimentation tank 311, and the impurity content of large particles in the water body near the edge position of the primary sedimentation tank 311 is smaller; however, the distance from the small particle impurities in the water body at the edge position of the first-stage settling tank 311 to the center of the vortex is long, so that the small particle impurities in the water body at the edge position are not easily attracted to the center of the vortex, and the impurity content of the small particles in the water body at the edge position is high. After the wastewater treated by the first-stage sedimentation water tank 311 is placed into the second-stage sedimentation water tank 312 with smaller inner diameter, small particle impurities in the water body are more easily attracted to the center of the vortex for sedimentation due to the smaller inner diameter of the second-stage sedimentation water tank 312, so that the small particle impurities can be effectively removed in the second-stage sedimentation water tank 312.
In addition to the reasonable arrangement of the size relationship of the primary settling tank 311 and the secondary settling tank 312, the applicant has found that reasonable water intake positions in the primary settling tank 311 and the secondary settling tank 312 are also important. The first water taking device 332 and the second water taking device 333 are respectively arranged in the first-stage sedimentation water tank 311 and the second-stage sedimentation water tank 312 in an eccentric liftable manner, the water inlet of the second-stage sedimentation water tank 312 is connected with the first water taking device 332 through a pipeline, a water suction pump is arranged on the pipeline, the water inlet of the second-stage sedimentation water tank 312 is arranged at the bottom of the second-stage sedimentation water tank 312, and wastewater settled by the first-stage sedimentation water tank 311 is pumped into the second-stage sedimentation water tank 312 through the pipeline by the first water taking device 332 for secondary sedimentation.
The specific eccentric position of the first water collector 332 in the first-stage settling tank 311 is: a first partThe inner diameter of the barrel of the stage settling water tank 311 is R1, the distance from the first water collector 332 to the central axis of the stage settling water tank 311 is D1, and D1=k 2 R1, wherein 0.50.ltoreq.k 2 Less than or equal to 0.70; the first water collector 332 can collect water with the impurity content as low as possible in the range, and the water with the impurity content of small particles collected in the range can facilitate the subsequent sedimentation in the secondary sedimentation water tank 312.
The specific eccentric position of the second water collector 333 in the secondary sedimentation tank 312 is: the inner diameter of the barrel of the secondary sedimentation water tank 312 is R2, the distance from the second water taking device 333 to the central axis of the secondary sedimentation water tank 312 is D2, and D2=k 3 R2, wherein 0.65.ltoreq.k 3 Less than or equal to 0.90; the secondary settling tank 312 has a smaller number of small particle impurities in the location and a smaller amount of water impurities is taken.
In this embodiment, the first water collector 332 and the second water collector 333 are further provided with a water collecting lifting rod 331, and the water collecting lifting rod 331 is used for adjusting the heights of the first water collector 332 and the second water collector 333. The height adjusting mode of the water taking device is as follows: the water taking lifting rod 331 moves up and down along the vertical direction, a stepping motor is arranged on the water taking lifting rod 331, the stepping motor drives the water taking lifting rod 331 to lift, and meanwhile the water taking lifting rod 331 drives the water taking device 330 to move up and down; it should be noted that, the device for driving the water intake lifter 331 is not limited to one type of stepping motor, and may be any device that can basically realize the adjustable movement of the water intake lifter 331 in the up-down position, such as a driving cylinder.
In addition, a liquid level meter 340 is arranged on the primary sedimentation water tank 311 and the secondary sedimentation water tank 312, and the liquid level meter 340 is used for detecting the water level height in the primary sedimentation water tank 311 and the secondary sedimentation water tank 312; so that the water intake elevating rod 331 adjusts the height of the water intake device according to the water level height, so that the water intake device can maintain a set height in the settling tank. In addition, the liquid level meter 340 is electrically connected with the water taking lifting rod 331 through the controller, the liquid level meter 340 transmits measurement data to the controller, the controller controls the stepping motor to work, and finally the water taking device is kept at a set height, so that the water taking device can always extract water with a fixed depth for further treatment or use.
It is worth to be noted that, in the first-stage settling water tank 311 and/or the second-stage settling water tank 312, a sediment extractor 350 is vertically arranged along the central axis of the settling water tank, the sediment extractor 350 is tubular, the top end of the sediment extractor 350 is communicated with a suction pipe 352, and a sediment suction pump 353 is arranged on the suction pipe 352; the sediment pump 353 works to pump out impurities such as sediment accumulated in the center of the vortex in the sedimentation tank by the sediment pump 350, so that excessive impurities are prevented from being accumulated in the sedimentation tank; and sediment withdrawal lifting rod 351 is arranged above sediment withdrawal device 350, sediment withdrawal lifting rod 351 drives sediment withdrawal device 350 to move up and down, when wastewater in the sedimentation tank generates vortex and impurities such as sediment are gathered to the center, sediment withdrawal lifting rod 351 drives sediment withdrawal device 350 to move down, sediment withdrawal pump 353 withdraws sediment at the center, and sediment withdrawal lifting rod 351 drives sediment withdrawal device 350 to ascend away from the boiled water. The driving mode of the sediment pumping lifting rod 351 is similar to that of the water taking lifting rod 331 and can be correspondingly arranged with a stepping motor; however, it should be noted that the device for driving the silt removing lifting bar 351 is not only a stepping motor, but may be a device capable of moving up and down the position of the silt removing lifting bar 351, such as a cylinder driving device.
The second water intake 333 is connected with the filter 400 through a pipeline, and the filter 400 is connected with the water storage tank 500 through a pipeline; after the water taker 330 takes water, the water is pumped into the filter 400 by a water pump for further filtration; the filtered water is pumped into the water storage tank 500 by a water pump for storage; the water storage tank 500 is connected with the nozzle 600 through a pipeline, and the nozzle 600 can clean the automobile 700. In this embodiment, the water storage tank 500 is provided with the heater 510, and the heater 510 is used for heating water in the water storage tank 500, so that the heated water-washing vehicle is not only beneficial to removing stains on the surface of the vehicle, but also beneficial to protecting the paint surface of the vehicle.
Example 2
This embodiment is basically the same as embodiment 1, except that the primary settling tank 311 has a tank inner radius R1, and the secondary settling tank 312 has a tank inner radius R2, r1=k 1 R2, where k 1 The value range of (2) is 1.5-k 1 Not more than 3, in this example k 1 ＝2。
Example 3
This embodiment is basically the same as embodiment 1, except that the primary settling tank 311 has a tank inner radius R1, and the secondary settling tank 312 has a tank inner radius R2, r1=k 1 R2, where k 1 The value range of (2) is 1.5-k 1 Not more than 3, in this example k 1 ＝3。
Example 4
The present embodiment is basically the same as embodiment 1, except that the secondary sedimentation tank 312 has a barrel inner radius R2, and the distance from the second water intake 333 to the central axis of the secondary sedimentation tank 312 is D2, d2=k 3 R2, wherein 0.65.ltoreq.k 3 Not more than 0.90, in this example 0.80 < k 3 ≤0.90。
Example 5
The carwash system used in the treatment method is the multistage sedimentation wastewater circulation carwash system described in embodiments 1 to 5; the method comprises the following specific steps:
step one, first-stage sedimentation
The collected car washing wastewater is placed in the first-stage sedimentation water tank 311, low-speed vortex is generated through rotation of the first vortex blade 321 to carry out first-stage sedimentation, the rotating speed of the first vortex blade 321 is n1, most of the rotating speed of the first vortex blade 321 in the process of generating the vortex is in a peak rotating speed state, the influence of the rotating speed in other time periods on the vortex is small, so that the rotating speed n1 refers to the peak rotating speed, the value range of n1 is 100-160 r/min, and in the embodiment, n1=140r/min. By the low-speed rotation of the first vortex blade 321 in the first-stage settling tank 311, impurities in the car washing wastewater, particularly large-particle impurities, are effectively deposited at the center of the vortex in the first-stage settling tank 311.
After the primary sedimentation, water is taken from the eccentric position of the primary sedimentation water tank 311 by the first water taking device 332, and the specific eccentric position is set in the position of the first water taking device 332 in the multistage sedimentation wastewater circulation car washing system of embodiments 1 to 5.
Step two, secondary sedimentation
The wastewater after primary sedimentation is placed in a secondary sedimentation water tank 312 with the inner diameter smaller than that of the primary sedimentation water tank 311, and the specific relationship between the inner diameters of the primary sedimentation water tank 311 and the secondary sedimentation water tank 312 is shown in the relationship between the inner diameters of the primary sedimentation water tank 311 and the secondary sedimentation water tank 312 in the multi-stage sedimentation wastewater circulation car washing system in examples 1-5. The second vortex blade 322 rotates to generate high-speed vortex to perform secondary sedimentation, and the rotating speed of the second vortex blade 322 is higher than that of the first vortex blade 321; the rotational speed of the second vortex blade 322 is n2, and since most of the rotational speed of the second vortex blade 322 is in the peak rotational speed state during the generation of the vortex, the rotational speed in other periods has less influence on the generation of the vortex, the rotational speed n2 herein means the peak rotational speed, the value of n2 ranges from 200 to 560r/min, and in addition, n2=k 6 n1, controlling k to be more than or equal to 2 during secondary sedimentation 6 < 3.5, k in this example 6 =2.5, n1=350r/min. By setting the relation between the rotation speed of the second vortex blade 322 and the rotation speed of the first vortex blade 321, the vortex generated by the secondary sedimentation water tank 312 enables more small particle impurities to be deposited at the center of the secondary sedimentation water tank 312, so that the treatment effect of the secondary sedimentation water tank 312 is further improved.
Water is taken from the eccentric position of the secondary sedimentation water tank 312 through the second water taking device 333 after secondary sedimentation; the specific eccentric position is shown in the position setting of the second water collector 333 in the multistage sedimentation wastewater circulation car washing system of examples 1 to 5.
Step three, filtering and recycling
And (5) introducing the wastewater subjected to secondary sedimentation into a filter 400 for filtering, and recycling after filtering.
Example 6
The embodiment is basically the same as embodiment 5, and is different in that the method for treating the car washing wastewater in the embodiment further reasonably sets a water taking position of a water taking device in a treatment process, and specifically sets:
the liquid level of the wastewater in the first-stage settling water tank 311 is H1, the water intake position of the first water intake device 332 to the liquid level of the wastewater in the first-stage settling water tank 311 is H1, h1=k 4 H1, first-stage sedimentation control0.2≤k 4 Less than or equal to 0.4; in the process of generating a vortex in the first-stage settling water tank 311 to perform first-stage settling, the rotation of the first vortex blade 321 may enable a part of impurities in the water body at the bottom of the first-stage settling water tank 311 to generate centrifugal force, so that the part of impurities move towards the edge of the first-stage settling water tank 311, move upwards after encountering the inner wall of the first-stage settling water tank 311, and then move towards the center of the vortex again under the action of the vortex. The phenomenon causes local change of impurity distribution in the water body, and water taking at the height position is favorable for taking water with fewer impurities and is favorable for carrying out subsequent secondary sedimentation.
The liquid level of the wastewater in the secondary sedimentation tank 312 is H2, the water intake position of the second water intake device 333 is H2 to the liquid level of the wastewater in the secondary sedimentation tank 312, and h2=k 5 H2, k is controlled to be more than or equal to 0.3 during secondary sedimentation 5 Less than or equal to 0.6; the phenomenon occurring in the secondary sedimentation tank 312 is similar to that of the primary sedimentation tank 311, and the second water collector 333 collects water at the height position described above, which is favorable for recycling water with less small particle impurities.
Example 7
This embodiment is basically the same as embodiment 6, except that the liquid level of the wastewater in the first-stage settling tank 311 is H1, and the water level of the wastewater from the water intake position of the first water intake 332 to the first-stage settling tank 311 is H1, h1=k 4 H1; the liquid level of the wastewater in the secondary sedimentation tank 312 is H2, the water intake position of the second water intake device 333 is H2 to the liquid level of the wastewater in the secondary sedimentation tank 312, and h2=k 5 H2. In this embodiment, k is 0.2.ltoreq.k 4 When the k is less than or equal to 0.3, the k is less than or equal to 0.5 5 Less than or equal to 0.6; when 0.3 < k 4 When the k is less than or equal to 0.4, the k is less than or equal to 0.3 5 < 0.5; the impurity content of the small particles in the water body can be changed at different water taking positions of the first water taking device 332, and the second water taking device 333 is specifically set according to the difference of the impurity content in the water taken by the first water taking device 332, so that the water treatment effect of the secondary sedimentation water tank 312 can be further improved.
The invention has been described in detail hereinabove with reference to specific exemplary embodiments thereof. It will be understood that various modifications and changes may be made without departing from the scope of the invention as defined by the appended claims. The detailed description and drawings are to be regarded in an illustrative rather than a restrictive sense, and if any such modifications and variations are desired to be included within the scope of the invention described herein. Furthermore, the background art is intended to illustrate the status and meaning of the development of the technology and is not intended to limit the invention or the application and field of application of the invention.
More specifically, although exemplary embodiments of the present invention have been described herein, the present invention is not limited to these embodiments, but includes any and all embodiments that have been modified, omitted, e.g., combined, adapted, and/or substituted between the various embodiments, as would be recognized by those skilled in the art in light of the foregoing detailed description. The limitations in the claims are to be interpreted broadly based on the language employed in the claims and not limited to examples described in the foregoing detailed description or during the prosecution of the application, which examples are to be construed as non-exclusive. Any steps recited in any method or process claims may be executed in any order and are not limited to the order presented in the claims. The scope of the invention should, therefore, be determined only by the appended claims and their legal equivalents, rather than by the descriptions and examples given above.
Claims (7)
1. The multistage sedimentation wastewater circulation car washing system is characterized by comprising a car washing table (100), a water collecting tank (200), a sedimentation unit (300), a water storage tank (500) and a nozzle (600), wherein the water collecting tank (200) is arranged below the car washing table (100), and the water collecting tank (200) is communicated to the sedimentation unit (300) through a pipeline;
the sedimentation unit (300) comprises a primary sedimentation water tank (311) and a secondary sedimentation water tank (312); the center of the bottom of the primary sedimentation water tank (311) is provided with a first vortex blade (321), and a first water collector (332) is eccentrically arranged in the primary sedimentation water tank (311) in a lifting manner; the center of the bottom of the secondary sedimentation water tank (312) is provided with a second vortex blade (322), a second water taking device (333) is eccentrically and liftably arranged in the secondary sedimentation water tank (312), a water inlet of the primary sedimentation water tank (311) is connected with the water collecting tank (200), and a water inlet of the secondary sedimentation water tank (312) is connected with the first water taking device (332) through a pipeline; the inner diameter of the first-stage sedimentation water tank (311) is larger than that of the second-stage sedimentation water tank (312);
the second water taking device (333) is connected with the water inlet of the water storage tank (500) through the filter (400), and the water outlet of the water storage tank (500) is connected with the nozzle (600) through a pipeline;
the primary sedimentation water tank (311) and the secondary sedimentation water tank (312) are round barrels, the barrel inner radius of the primary sedimentation water tank (311) is R1, the barrel inner radius of the secondary sedimentation water tank (312) is R2, and R1=k 1 R2, wherein 1.5.ltoreq.k 1 ≤3；
The distance from the first water collector (332) to the central axis of the primary sedimentation water tank (311) is D1, and D1=k 2 R1, wherein 0.50.ltoreq.k 2 Less than or equal to 0.70; the distance from the second water taking device (333) to the central axis of the secondary sedimentation water tank (312) is D2, and D2=k 3 R2, wherein 0.65.ltoreq.k 3 ≤0.90。
2. The multistage sedimentation wastewater circulation car washing system according to claim 1, wherein the first water collector (332) and the second water collector (333) are provided with water collecting lifting rods (331), and the water collecting lifting rods (331) are used for adjusting the heights of the first water collector (332) and the second water collector (333).
3. The multi-stage sedimentation wastewater circulation car washing system according to claim 2, wherein a liquid level meter (340) is arranged on the primary sedimentation water tank (311) and the secondary sedimentation water tank (312), and the liquid level meter (340) is used for detecting the water level height in the primary sedimentation water tank (311) and the secondary sedimentation water tank (312); the liquid level meter (340) is electrically connected with the water taking lifting rod (331) through a controller.
4. A car washing wastewater treatment method, which is characterized in that a car washing system used in the treatment method is a multistage sedimentation wastewater circulation car washing system according to any one of claims 1 to 3; firstly, carrying out primary sedimentation on the collected car washing wastewater in a low-speed vortex; secondly, carrying out secondary sedimentation on the car washing wastewater subjected to primary sedimentation in a high-speed vortex; and filtering and recycling the wastewater after the secondary sedimentation.
5. The method for treating car washing wastewater according to claim 4, which comprises the following specific steps:
step one, first-stage sedimentation
Placing the collected car washing wastewater into a first-stage sedimentation water tank (311), and carrying out first-stage sedimentation by generating vortex through rotation of a first vortex blade (321); after primary sedimentation, water is taken from the eccentric position of the primary sedimentation water tank (311) through a first water taking device (332);
step two, secondary sedimentation
Placing the wastewater subjected to primary sedimentation into a secondary sedimentation water tank (312) with the inner diameter smaller than that of the primary sedimentation water tank (311), generating vortex through rotation of a second vortex blade (322) to carry out secondary sedimentation, wherein the rotating speed of the second vortex blade (322) is larger than that of the first vortex blade (321); water is taken from the eccentric position of the secondary sedimentation water tank (312) through a second water taking device (333) after secondary sedimentation;
step three, filtering and recycling
And (3) introducing the wastewater subjected to the secondary sedimentation into a filter (400) for filtering, and recycling after filtering.
6. The method for treating car washing wastewater according to claim 4, wherein the liquid level of the wastewater in the primary sedimentation tank (311) is H1, and the liquid level of the wastewater from the water intake position of the first water intake device (332) to the primary sedimentation tank (311) is H1, h1=k 4 H1, k is controlled to be more than or equal to 0.2 during primary sedimentation 4 Less than or equal to 0.4; the liquid level of the wastewater in the secondary sedimentation water tank (312) is H2, and the water taking position of the second water taking device (333) is H2, and the liquid level of the wastewater in the secondary sedimentation water tank (312) is H2=k 5 H2, k is controlled to be more than or equal to 0.3 during secondary sedimentation 5 ≤0.6。
7. The method for treating waste water from car washing according to any one of claims 4 to 6, wherein the rotational speed of the first swirl vane (321) is n1, the rotational speed of the second swirl vane (322) is n2, n2=k 6 n1, controlling k to be more than or equal to 2 during secondary sedimentation 6 ＜3.5。
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