CN111573860A - Method for treating raw water by utilizing multistage drop aeration device in small-sized water plant - Google Patents
Method for treating raw water by utilizing multistage drop aeration device in small-sized water plant Download PDFInfo
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- CN111573860A CN111573860A CN202010329461.9A CN202010329461A CN111573860A CN 111573860 A CN111573860 A CN 111573860A CN 202010329461 A CN202010329461 A CN 202010329461A CN 111573860 A CN111573860 A CN 111573860A
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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
- C02F7/00—Aeration of stretches of 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
- Y02W10/10—Biological treatment of water, waste water, or sewage
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Abstract
The invention discloses a method for treating raw water by utilizing a multistage drop aeration device in a small-sized waterworks, which comprises a water inlet pipe and two or more drop plates, wherein the drop plates are stacked in parallel from top to bottom at the first stage; the water inlet pipe penetrates through the center of the water dropping plate and is fixedly connected with the water dropping plate, and the top of the water inlet pipe protrudes out of the first-stage water dropping plate; a plurality of through holes are uniformly distributed on the water dropping plate; raw water flows through the water inlet pipe and then overflows from the top opening of the water inlet pipe to the multistage water dropping plate and flows into the water tank through the through hole. According to the method, the raw water passes through each layer of water dropping plate step by step in a sprinkling manner by densely opening holes on the water dropping plates which are stacked in multiple stages and adding the water baffle plates on the periphery of the water dropping plates, so that the contact time with air is greatly prolonged. Because the trompil is intensive, the bore diameter is less, and rivers are through when the cavity, because rivers self viscous force can produce certain detention nature, further increase the idle time, make redox reaction more abundant.
Description
Technical Field
The invention relates to the technical field of hydroelectric engineering construction, in particular to a multistage drop aeration device for treating raw water of a small-sized waterworks and a method for treating the raw water by utilizing the multistage drop aeration device in the small-sized waterworks.
Background
The underground water containing iron and manganese is widely distributed, and a large amount of iron and manganese elements are dissolved in the underground water with insufficient dissolved oxygen. Particularly, when the iron content is high, the iron has large fishy smell, so that iron bacteria are easy to breed, objects are corroded, pipelines are blocked, and production and domestic water are affected. The water treatment is to remove or reduce the iron, manganese and other substances in the raw water to normal level (Fe is less than or equal to 0.3mg/L, Mn is less than or equal to 0.1mg/L) through physical and chemical modes. The treatment of raw groundwater mainly aims at removing iron, and the oxidation method is generally most convenient and economical. In order to ensure the oxygen dissolving effect and improve the iron removal efficiency, raw water needs to be aerated.
The existing aeration method comprises the following steps: blast aeration, mechanical aeration, jet aeration and drop aeration.
The drop aeration is that the water body falls from a high place to stir the water surface to generate hydraulic jump, so that the surface of the raw water liquid level contacted with the air is continuously updated, oxygen in the air is transferred into the water body, the water body is oxygenated, the PH value of the raw water is improved, and simultaneously, ferrous ions and oxygen are subjected to redox reaction to form iron ion precipitation, thereby achieving the purpose of primarily removing iron. Compared with other three aeration modes, the drop aeration mode has the advantages of higher efficiency, convenient management, energy conservation and the like. Further, the longer the contact time between the raw water and the air, the wider the contact area, the more sufficient the reaction, and the better the iron removal effect.
Present drop aeration equipment, like chinese patent, application number is 201520419234. X's utility model patent, specifically disclose a water purification plant water treatment drop aerator, including an aeration tank, aeration tank's bottom is equipped with a former water input tube, former water input tube links to each other with the water inlet of locating the eminence, aeration tank's bottom opposite side is equipped with the delivery port, after extending to in the aeration tank, former water input tube links to each other with the interior water pipe of aeration that extends to upper portion in the aeration tank perpendicularly again, the drop aeration pipe is established to the outside of water pipe again cover in the aeration, the upper portion of drop aeration pipe is equipped with the inlet port, the highly being greater than former water input tube water inlet height of inlet port, the lower part of drop aeration pipe is equipped with the aeration outlet port. In the drop aeration apparatus mentioned in the above patent, the contact time of water and air is short, so that the dissolved oxygen in water is low, and the aeration effect is poor.
In addition, the more common multistage drop aeration device adopts a stepped structure, so that water flows downwards along steps in a first step and a second step, and the contact area of the water flow and air is increased to realize the aeration function. However, in practical application, the aeration effect of the drop aeration device with the structure is not ideal, and the problem that the floor area of the whole device is too large due to the stepped structure also exists.
Disclosure of Invention
The invention designs a novel multistage drop aeration device for treating raw water, wherein a plurality of drop plates which are arranged in parallel up and down are arranged in a stacked manner to reduce the floor area, and a plurality of through holes are arranged on the drop plates to realize water circulation of the drop plates on the upper and lower stages and increase the area and the exposure time of water flow exposed in the air, so that iron ions contained in the raw water are fully contacted with oxygen in the air in a multistage drop and small hole sprinkling manner to carry out full chemical reaction, thereby effectively removing metal substances such as iron ions and the like.
The multistage drop aeration device comprises a water inlet pipe and two or more drop plates, wherein the drop plates are stacked in parallel from top to bottom in a first stage; the water inlet pipe penetrates through the center of the water dropping plate and is fixedly connected with the water dropping plate, and the top of the water inlet pipe protrudes out of the first-stage water dropping plate; a plurality of through holes are uniformly distributed on the water dropping plate.
According to the invention, the plurality of through holes are formed in the drop plate, so that the water flow is ensured to flow out of the drop plate through the through holes and reach the next drop plate, and the stroke of the water flow in the flowing process is increased, so that the water flow can be more fully exposed in the air, the oxygen content in the water flow is further increased, and the sufficient oxygen and metal ions in the raw water are ensured to carry out chemical reaction so as to fully remove the metal ions in the raw water.
Furthermore, the size of the through holes on the water dropping plate is 6-10mm, and the distance between the through holes is 20-30 mm. . The through holes are 6-10mm in diameter, the distance between the through holes is 20-30mm, the through holes are densely formed in the water falling plate, the aperture of each through hole is small, and when water flows through the through holes, certain detention can be generated due to the viscosity of the water flow, so that the idle time is further increased, and the oxidation-reduction reaction is more sufficient.
Further, the distance between the water dropping plates is 300-600 mm. The distance between the water dropping plates ensures that the water flow has certain impact force, so that the water flow is convenient to diffuse; meanwhile, the minimum amount of water flow is guaranteed to be splashed out of the water drop plate, and water resource waste is avoided.
Furthermore, a baffle plate is arranged at the edge of the water dropping plate. In some preferred embodiments, the baffle height is between 100 and 200 mm. Furthermore, the included angle formed between the baffle and the water dropping plate is 90-120 degrees.
Furthermore, the number of the water dropping plates is 5-10. In a preferred embodiment, the number of drop plates is 7.
Further, a water retaining cap is arranged at the top of the water inlet pipe; the water retaining cap is connected to the side wall of the top of the water inlet pipe through a flow-deflecting energy-dissipating baffle; the size of the water retaining cap is larger than the size of the opening of the water inlet pipe. Furthermore, the separation blade that sets up the bias flow energy dissipation between manger plate cap and inlet tube is except supporting the manger plate cap, still has the effect of bias flow energy dissipation, and water when the inlet tube spills over the inlet tube open-top under pressure, is blockked and shunted by the separation blade, and convenient more even distribution is to the drop board of first order. Furthermore, the number of the baffle plates is 4, and the baffle plates are uniformly distributed on the inner top of the water retaining cap and the side wall of the water inlet pipe.
Furthermore, the retaining piece that the manger plate cap was dissipated energy through the bias flow is connected at inlet tube top lateral wall.
The setting of manger plate cap had both guaranteed that the inlet tube top flows the raw water and had gone out to first order drop board because of too big and too long distance outflow of splash department, still made the raw water impact carry out diffusion formula bounce-back reposition of redundant personnel behind the manger plate cap when flowing from the inlet tube top, guaranteed that the raw water that the inlet tube came out can more even diffusion to whole first order breakwater, increased the area of contact of raw water and air.
In some preferred embodiments, the water retaining cap is circular and has a diameter 2-3 times the diameter of the water inlet pipe.
Furthermore, a plurality of supporting columns which are uniformly arranged are arranged at the edges of the two or more water dropping plates.
Further, the water dropping plate is of a rectangular or square structure; the number of the supporting columns is eight, and the supporting columns are respectively arranged at four corners and the centers of four edges of the water drop plate.
Further, the water drop device further comprises a blower which is located on one side of the water drop plate. The blower is arranged to increase the flow of air and to bring more air into contact with the water flow.
Furthermore, the device also comprises a booster pump which is connected at the joint of the bottom of the water inlet pipe and the raw water inlet.
Furthermore, the device also comprises a water pool, and the bottom of the support column is fixed on the edge of the water pool.
On the other hand, the method for treating raw water by using the multistage drop aeration device in the small-scale water plant comprises the multistage drop aeration device, a water inlet and a water tank, wherein the multistage drop aeration device comprises a water inlet pipe and one or more drop plates, and the drop plates are stacked in parallel from top to bottom in a first stage; the water inlet pipe penetrates through the center of the water dropping plate and is fixedly connected with the water dropping plate, and the top of the water inlet pipe protrudes out of the first-stage water dropping plate; a plurality of through holes are uniformly distributed on the water dropping plate; the bottom of the water inlet pipe is connected with a raw water inlet; the multi-stage drop aeration device is positioned right above the water tank; the specific operation steps are as follows:
a. opening a water inlet to enable raw water to be treated to enter the bottom of the water inlet pipe;
b. raw water flows through the water inlet pipe and then overflows from the top opening of the water inlet pipe;
c. the overflowing raw water falls onto the first-stage water falling plate at the top, water flows dispersedly flow along the first-stage water falling plate, and meanwhile, the water flows into the through holes of the water falling plate;
d. entering the next-stage water dropping plate through the first-stage water dropping plate through hole;
e. the water flow dispersedly flows on the drop plate of the next stage, and simultaneously enters the drop plate through hole of the next stage;
f. if more than two water drop plates are arranged, the water flow flows into the water drop plate of the next stage through the through hole on the water drop plate of the previous stage and circulates in sequence;
g. the water flow on the water dropping plate of the last stage is diffused and flows into the water tank through the through holes of the water dropping plate, and the raw water treatment is completed.
In the raw water treatment method, the newly provided multistage drop aeration device is adopted, and the plurality of through holes are formed in the drop plate, so that the water flow is ensured to flow out of the drop plate through the through holes to reach the next drop plate, and the stroke of the water flow in the flowing process is prolonged, so that the water flow can be more fully exposed in the air, the oxygen content in the water flow is further increased, and the sufficient oxygen and metal ions in the raw water are ensured to carry out chemical reaction to fully remove the metal ions in the raw water.
Further, still include the booster pump, the booster pump is connected in inlet tube and water inlet junction, in step a, open the booster pump when opening the water inlet.
And furthermore, the device also comprises an air blower, and in the step a, after the water inlet is opened, the air blower is started. The blower is arranged to increase the flow of air and to bring more air into contact with the water flow.
Furthermore, a baffle is arranged at the edge of the water drop plate; in the steps a, d and f, the falling water flow is blocked on the water dropping plate by the baffle plate. Furthermore, the baffle plate and the water dropping plate form an included angle of 90-120 degrees.
Furthermore, the size of the through holes on the water dropping plate is 6-10mm, and the distance between the through holes is 20-30 mm. The through holes are 6-10mm in diameter, and the distance between the through holes is 20-30mm, so that the water drop plate is densely provided with the through holes, the aperture of the through holes is small, and when water flows pass through the through holes, certain detention can be generated due to the self viscosity of the water flow, the air retention time is further increased, and the oxidation-reduction reaction is more sufficient.
Further, the distance between the water dropping plates is 300-600 mm.
Further, a water retaining cap is arranged at the top of the water inlet pipe; the water retaining cap is connected to the side wall of the top of the water inlet pipe through a flow-deflecting energy-dissipating baffle; in the step b, the raw water flows through the water inlet pipe and then overflows from the top of the water inlet pipe, then impacts the water retaining cap and the drift energy dissipation baffle plate, and is blocked by the water retaining cap and the drift energy dissipation baffle plate to be shunted to the first-stage water dropping plate.
The arrangement of the water retaining cap ensures that the splashing position of raw water flowing out of the top of the water inlet pipe due to overlarge pressure flows out of the first-stage water dropping plate in a too long distance, and also ensures that the raw water impacts the water retaining cap and then is subjected to diffusion type rebound flow splitting when flowing out of the top of the water inlet pipe, so that the raw water flowing out of the water inlet pipe can be more uniformly diffused on the whole first-stage water retaining plate, and the contact area between the raw water and air is increased; and when water in the water inlet pipe overflows the top opening of the water inlet pipe under pressure, the separation blade with bias flow energy dissipation blocks and divides the water, so that the water is conveniently and uniformly distributed on the first-stage water dropping plate. Furthermore, the number of the baffle plates for dissipating bias flow is 4, and the baffle plates are uniformly distributed on the inner top of the water retaining cap and the side wall of the water inlet pipe.
In some preferred embodiments, the water retaining cap is circular and has a diameter 2-3 times the diameter of the water inlet pipe.
Furthermore, a plurality of supporting columns which are uniformly arranged are arranged at the edges of two or more water dropping plates; the bottom of the supporting column is fixed at the edge of the pool.
Further, the water dropping plate is of a rectangular or square structure; the number of the supporting columns is eight, and the supporting columns are respectively arranged at four corners and the centers of four edges of the water drop plate.
Advantageous effects
The device and the method of the invention make the raw water pass through each layer of water dropping plate step by step in a sprinkling way by densely perforating the water dropping plates which are stacked in multiple stages and adding the water baffle plates at the periphery of the water dropping plates, thereby greatly prolonging the contact time with the air. In addition, because the open pores are dense, the pore diameter is small, and when water flows through the cavity, certain detention can be generated due to the self viscosity of the water flow, so that the air retention time is further increased, and the oxidation-reduction reaction is more sufficient. Compared with other water drop aeration devices, the multi-stage perforated aeration device has the advantages that raw water has more empty time and larger contact area, the pH value of underground water can be increased, and ferrous iron is oxidized into ferric iron and then is precipitated in a subsequent sedimentation tank. Compared with other free-fall type aeration devices, the design of multi-stage falling and small-hole sprinkling has the advantages of longer air-leaving time and larger specific surface area, thereby having better aeration effect.
In addition, the device adopts integrated welding, so that the device has good integrity and is very convenient to hoist and mount; meanwhile, the shape, the size and the number of layers can be changed according to design requirements and actual requirements, and the applicability is strong. The excellent weldability and corrosion resistance of the stainless steel material almost do not exist in later maintenance, maintenance and the like, and the appearance is attractive and practical.
Drawings
Fig. 1 is a schematic elevation view of the multistage drop aeration apparatus of the present invention.
Fig. 2 is a schematic plan view of the drop plate.
Fig. 3 is a schematic sectional view of the multistage drop aeration apparatus of the present invention.
Fig. 4 is a schematic elevation view of another multi-stage drop aeration apparatus of the present invention.
Description of reference numerals:
the multi-stage water drop aeration device comprises a multi-stage water drop aeration device 100, a water inlet 1, a water pool 20, a water inlet pipe 7, an opening 71 at the top of the water inlet pipe, a water drop plate 10, a water drop plate 2 at the last stage, a water drop plate 5 at the first stage, a through hole 11, a baffle 6, a support column 3, a water retaining cap 4, a baffle 8 and an air blower 30.
Detailed Description
The mechanisms involved in the present invention or these terms of art used are further described below. In the following detailed description, reference is made to the accompanying drawings that form a part hereof, and in which is shown by way of illustration specific embodiments in which the invention may be practiced. It is not excluded that the invention can also be implemented in other embodiments and that the structure of the invention can be varied without departing from the scope of use of the invention.
As shown in fig. 1 to 4, the multistage drop aeration apparatus 100 for raw water treatment of a small-sized water plant of the present invention comprises a water inlet pipe 7 and two or more drop plates 10, wherein the two or more drop plates 10 are stacked up and down, and the drop plates 10 are parallel to each other; the water inlet pipe 7 penetrates through the center of the water dropping plate 10 and is fixedly connected with the water dropping plate 10, and an opening 71 at the top of the water inlet pipe 7 protrudes out of the water dropping plate 5 at the first stage. The multistage drop aeration device 100 is connected with a raw water inlet, and raw water enters a water inlet pipe through the water inlet and then enters a drop plate for drop aeration treatment. In one embodiment, the bottom of the water inlet pipe is connected with the raw water inlet through a flange, and water enters the device from the lower part. In some specific embodiments, the drop plate 10 and the water inlet pipe 7 are both made of metal, and are welded and fixed therebetween, and the multi-stage drop plate 10 is welded layer by layer around the water inlet pipe 7 in a parallel manner. A plurality of through holes 11 are uniformly distributed on all the drop plates 10, as shown in fig. 2. The water inlet 1 connected with raw water through the water inlet pipe 7 transports the raw water to the position of the top opening 71 of the water inlet pipe to overflow to the water dropping plate, and the raw water flows into the water dropping plate 10 on the lower layer through the through hole 11 on the water dropping plate, so that the water dropping aeration is realized. As shown in fig. 2, in some embodiments, the size of the through hole 11 on the drop plate 10 is 6-10mm, and in particular embodiments, the size of the through hole is 8mm, 9mm, or 10 mm. In other embodiments, the spacing between the through holes 11 is 20-30 mm. Specifically, the through hole pitch is 20mm or 25mm or 30 mm. The through holes 11 are densely formed in the water falling plate, the aperture of each through hole is small, the aperture size of each through hole 11 can enable raw water to generate surface tension when flowing through the through hole, and therefore water flow has viscosity and can generate certain detention when flowing through the through holes 11, the emptying time is further prolonged, and the oxidation-reduction reaction is more sufficient.
In the invention, 5-10 water dropping plates 10 are arranged, and the distance between the water dropping plates 10 is 300-600 mm. This interval of drop board 10 guarantees that rivers can have certain impact force, the diffusion of being convenient for, has simultaneously not the rivers spill outside drop board 10, wastes water resource. In a specific embodiment, the distance between the water dropping plates is 400 mm.
In some embodiments, the edge of the drop plate 10 is provided with a baffle 6. In some preferred embodiments, the baffle 6 is between 100 and 200mm high. In a specific embodiment, the height of the baffle is 200 mm. The baffle 6 is distributed around each layer of the drop plate 10 in a welding mode. The included angle formed between the baffle 6 and the water dropping plate 10 is 90-120 degrees, such as: 100 degrees, 110 degrees and 120 degrees.
In some embodiments, the top of the water inlet pipe 7 is provided with a water retaining cap 4; the water retaining cap 4 is welded at the position of the top opening 71 of the water inlet pipe and the side wall of the top of the water inlet pipe 7 through a baffle 8. Specifically, as shown in fig. 3, one end of the baffle 8 is welded and fixed on the side wall of the top of the water inlet pipe and is higher than the opening 71 of the top of the water inlet pipe, and the top of the baffle 8 is connected to the inner top of the water retaining cap 4; the baffle plates 8 are a plurality of and are uniformly distributed on the side wall of the water inlet pipe 7 and the inner top of the water retaining cap 4. In one embodiment, there are 4 baffles 8. In one embodiment, the baffle plate 8 is made of stainless steel and has a thickness of 4 mm. The water retaining cap 4 is fixed above the water inlet pipe 7 through a baffle 8. In some embodiments, the water deflector cap 4 has a size larger than the inlet pipe opening 71. More specifically, the water retaining cap 4 is circular, and the diameter of the water retaining cap is 2-4 times that of the water inlet pipe 7. The water retaining and guiding effects of the water retaining cap 4 disperse raw water uniformly onto the first-stage water falling plate 5, then sequentially flow through the lower-layer multistage water falling plate, and meanwhile, the separation blade 8 connected with the water retaining cap 4 also has a bias energy dissipation function, so that the flow direction of the raw water coming out from the water inlet pipe opening 71 can be guided, the flow speed of the raw water can be reduced, and the raw water can be more uniformly distributed on the first-stage water falling plate 5.
The setting of manger plate cap 4 and separation blade 8 has both guaranteed that 7 tops of inlet tube flow the raw water and has gone out the first order fall board 5 because of too big and too far-distance outflow of splash department, still makes the raw water impact when flowing from 7 open-tops of inlet tube and carries out diffusion formula bounce-back reposition of redundant personnel on manger plate cap 4 and the separation blade 8, guarantees that the raw water that inlet tube 7 came out can be more even diffusion to whole first order breakwater 5 on, increases the area of contact of raw water and air. In some embodiments, the distance from the water retaining cap 4 to the top opening 71 of the water inlet pipe is 30-50 mm.
In the present invention, in order to further enhance the stability of the multiple stages of drop plates 10, a plurality of support columns 3 are uniformly arranged at the edges of two or more drop plates 10. The multi-stage drop aeration apparatus 100 is typically mounted on a basin 20, and the basin 20 is used to collect water treated by the multi-stage drop aeration apparatus 100. The support post 3 for connecting and fixing the drop plate is fixed at the edge of the water basin 20 through the bottom.
In some embodiments, the drop plate 10 has a rectangular or square structure; the number of the support columns 3 is eight, and the support columns are respectively arranged at four corners and the centers of four sides of the drop plate 10. In some embodiments, the support column 3 is welded to the drop plate 10.
The multistage drop aeration device 100 of the present invention may further include a blower 30, as shown in fig. 4, the blower 30 is located on one side of the drop plate 10. The flow of air is increased by blowing air through the blower 30, causing more air to contact the water flow. In some embodiments, it is sufficient to set which side of the drop plate the blower 30 is located on according to the wind direction, so that the airflow blown by the blower is the same as the wind direction.
Or, considering that the pressure of the underground raw water is not enough, the apparatus 100 further includes a booster pump, which is connected to the connection between the bottom of the water inlet pipe and the water inlet of the raw water.
In addition, when the raw water treatment is carried out by the multistage drop aeration device 100 of the invention, the specific operation steps are as follows:
a. opening a water inlet to enable raw water to be treated to enter the bottom of the water inlet pipe 7; when the apparatus 100 has a booster pump, the booster pump is turned on when the water pressure is insufficient; and, when the apparatus 100 has the blower 30, the blower 30 is turned on;
b. raw water flows through the water inlet pipe 7 and then overflows from the top opening 71 of the water inlet pipe, impacts into the water retaining cap 4, is shunted and blocked by the water retaining cap 4 and the blocking piece 8, and rebounds and shunts to the first-stage water dropping plate 5; the falling water flow is blocked on the drop plate 5 by the baffle 6;
c. the water flow dispersedly flows along the first-stage water drop plate 5, and simultaneously enters the water drop plate through holes 11;
d. the water enters the water dropping plate 10 of the next stage through the through hole of the first-stage water dropping plate 5; the falling water flow is blocked on the water falling plate by the baffle plate;
e. the water flow dispersedly flows on the drop plate of the next stage, and simultaneously enters the drop plate through hole of the next stage;
f. if more than two drop plates 10 exist, the water flow flows into the drop plate of the next stage through the through hole 11 on the drop plate of the previous stage, and the falling water flow is blocked on the drop plate by the baffle; circulating in sequence;
g. the water flow on the last stage of the drop plate 2 is diffused and flows into the water tank 20 through the through holes 11, and the raw water treatment is completed.
Example 1
Drop aeration equipment 100 material selects for use 304 stainless steel, welds as an organic whole, and the size: 2660 × 2660 × 3235mm (length × width × height), drop plate 10 thickness is 5mm, the through-hole diameter on the drop plate is 10mm, its interval is 20mm, totally 7 drop plates 10 are stacked in parallel, the interval between drop plates 10 is 400mm, the baffle is 110 degrees and fixes around the drop plate, the baffle height is 100mm, aeration equipment 100 whole body is about 3.5 tons, it is convenient to hoist, it is convenient to transport, the practicality is strong.
Example 2
Raw water treatment was performed using the drop aeration apparatus of example 1: the daily treatment capacity of the water plant was 12MLD, and the operation was carried out for 24 hours using 2 aeration apparatuses of example 1, and the water passing area of each stage of aeration disk was 2.5X 2.5-6.25 m2The processing capacity of each stage of aeration disk is
Example 3
Data measurement and statistics were performed on the raw water treatment process in example 2. The dissolved oxygen concentration of the groundwater is increased from 0 to 6.05mg/l by seven stages of aeration. The pH of the water after aeration through the seven stage drop can be increased from 6.0 to 6.6 with total oxidation of ferrous to ferric. Over seven levels of natural drop oxygenation and pH effects are not obvious. The specific measurement results are shown in the following table:
the first table shows the results of the dissolved oxygen concentration test, and the dissolved oxygen concentration gradually increases with the increase of the number of stages.
Table 2 shows the results of the pH test, in which the pH was gradually increased as the number of steps was increased.
| Degree of times/number of |
1 | 2 | 3 | 4 | 5 | 6 | 7 |
| 1 | 6.01 | 6.18 | 6.35 | 6.43 | 6.54 | 6.60 | 6.63 |
| 2 | 6.03 | 6.19 | 6.38 | 6.42 | 6.52 | 6.61 | 6.63 |
| 3 | 6.01 | 6.18 | 6.36 | 6.44 | 6.52 | 6.59 | 6.62 |
| 4 | 6.02 | 6.20 | 6.35 | 6.41 | 6.53 | 6.60 | 6.64 |
| 5 | 6.05 | 6.19 | 6.36 | 6.42 | 6.52 | 6.61 | 6.65 |
| 6 | 6.03 | 6.20 | 6.34 | 6.44 | 6.53 | 6.61 | 6.63 |
| 7 | 6.04 | 6.21 | 6.37 | 6.42 | 6.54 | 6.59 | 6.62 |
| 8 | 6.03 | 6.19 | 6.35 | 6.41 | 6.51 | 6.58 | 6.64 |
| 9 | 6.01 | 6.19 | 6.36 | 6.43 | 6.52 | 6.60 | 6.60 |
| 10 | 6.03 | 6.20 | 6.34 | 6.43 | 6.54 | 6.62 | 6.62 |
| Mean value of | 6.03 | 6.19 | 6.36 | 6.43 | 6.53 | 6.60 | 6.63 |
Table 3 shows the results of the oxidation test of ferrous iron, and as the number of stages increases, ferrous iron ions are gradually oxidized into ferric iron.
| Degree of times/number of |
1 | 2 | 3 | 4 | 5 | 6 | 7 |
| 1 | 4.01 | 3.68 | 3.02 | 2.13 | 1.01 | 0.08 | 0.01 |
| 2 | 4.02 | 3.70 | 3.05 | 2.11 | 0.95 | 0.12 | 0.00 |
| 3 | 4.01 | 3.72 | 3.01 | 2.08 | 0.96 | 0.10 | 0.02 |
| 4 | 4.02 | 3.66 | 3.02 | 2.06 | 0.92 | 0.09 | 0.01 |
| 5 | 4.02 | 3.68 | 2.98 | 2.04 | 0.94 | 0.08 | 0.00 |
| 6 | 4.03 | 3.69 | 3.04 | 2.10 | 0.98 | 0.12 | 0.01 |
| 7 | 4.02 | 3.71 | 3.02 | 2.08 | 0.96 | 0.11 | 0.00 |
| 8 | 4.01 | 3.67 | 3.01 | 2.09 | 0.93 | 0.13 | 0.01 |
| 9 | 4.01 | 3.68 | 2.96 | 2.07 | 0.92 | 0.09 | 0.01 |
| 10 | 4.03 | 3.72 | 3.06 | 6.43 | 0.94 | 0.12 | 0.00 |
| Mean value of | 4.02 | 3.69 | 3.02 | 2.52 | 0.95 | 0.10 | 0.01 |
Claims (9)
1. A method for treating raw water by utilizing a multi-stage drop aeration device in a small-sized water plant comprises the multi-stage drop aeration device, a water inlet and a water tank, wherein the multi-stage drop aeration device comprises a water inlet pipe and one or more drop plates, and the drop plates are stacked in parallel from top to bottom in a first stage; the water inlet pipe penetrates through the center of the water dropping plate and is fixedly connected with the water dropping plate, and the top of the water inlet pipe protrudes out of the first-stage water dropping plate; a plurality of through holes are uniformly distributed on the water dropping plate; the bottom of the water inlet pipe is connected with the water inlet; the multi-stage drop aeration device is positioned right above the water tank; the specific operation steps are as follows:
a. opening a water inlet to enable raw water to be treated to enter the bottom of the water inlet pipe;
b. raw water flows through the water inlet pipe and then overflows from the top opening of the water inlet pipe;
c. the overflowing raw water falls onto the first-stage water falling plate at the top, water flows dispersedly flow along the first-stage water falling plate, and meanwhile, the water flows into the through holes of the water falling plate;
d. entering the next-stage water dropping plate through the first-stage water dropping plate through hole;
e. the water flow dispersedly flows on the drop plate of the next stage, and simultaneously enters the drop plate through hole of the next stage;
f. if more than two water drop plates are arranged, the water flow flows into the water drop plate of the next stage through the through hole on the water drop plate of the previous stage and circulates in sequence;
g. the water flow on the water dropping plate of the last stage is diffused and flows into the water tank through the through holes of the water dropping plate, and the raw water treatment is completed.
2. The method for treating raw water by using the multi-stage drop aeration device according to claim 1, further comprising a booster pump connected to the joint of the water inlet pipe and the water inlet, wherein in the step a, the booster pump is started while the water inlet is opened.
3. The method for treating raw water by using a multi-stage drop aeration device according to claim 1, further comprising a blower, wherein in the step a, the blower is turned on after the water inlet is opened.
4. The method for treating raw water by using the multi-stage drop aeration device according to claim 1, wherein baffles are arranged at the edges of the drop plates, and the falling water flow in the steps a, d and f is blocked on the drop plates by the baffles.
5. The method for treating raw water by using a multistage drop aeration device according to claim 1, wherein the size of the through holes on the drop plate is 6-10mm, and the distance between the through holes is 20-30 mm.
6. The method for treating raw water by using a multi-stage drop aeration device according to claim 1, wherein the distance between the drop plates is 300-600 mm.
7. The method for treating raw water by using a multi-stage drop aeration device according to claim 1, wherein a water retaining cap is provided at the top of the water inlet pipe; the water retaining cap is connected to the side wall of the top of the water inlet pipe through a flow-deflecting energy-dissipating baffle; in the step b, the raw water flows through the water inlet pipe and then overflows from the top of the water inlet pipe, then impacts the water retaining cap and the drift energy dissipation baffle plate, and is blocked by the water retaining cap and the drift energy dissipation baffle plate to be shunted to the first-stage water dropping plate.
8. The method for treating raw water by using a multi-stage drop aeration device according to claim 1, wherein a plurality of support columns are uniformly arranged at the edges of two or more drop plates; the bottom of the supporting column is fixed at the edge of the pool.
9. The method for treating raw water by using a multistage drop aeration device according to claim 8, wherein the drop plate has a rectangular or square structure; the number of the supporting columns is eight, and the supporting columns are respectively arranged at four corners and the centers of four edges of the water drop plate.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010329461.9A CN111573860A (en) | 2020-04-23 | 2020-04-23 | Method for treating raw water by utilizing multistage drop aeration device in small-sized water plant |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010329461.9A CN111573860A (en) | 2020-04-23 | 2020-04-23 | Method for treating raw water by utilizing multistage drop aeration device in small-sized water plant |
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Citations (5)
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|---|---|---|---|---|
| CN102249431A (en) * | 2011-07-08 | 2011-11-23 | 北京市水利科学研究所 | Vertical current hydraulic-drop aerating device |
| KR101566641B1 (en) * | 2014-11-25 | 2015-11-09 | 허종형 | Waterfall type aeration stirring device |
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| CN208667224U (en) * | 2018-07-23 | 2019-03-29 | 四川理工学院 | Dropping, aeration and biological catalytic oxidation one processing equipment |
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2020
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|---|---|---|---|---|
| CN102249431A (en) * | 2011-07-08 | 2011-11-23 | 北京市水利科学研究所 | Vertical current hydraulic-drop aerating device |
| KR101566641B1 (en) * | 2014-11-25 | 2015-11-09 | 허종형 | Waterfall type aeration stirring device |
| WO2016166775A2 (en) * | 2015-04-16 | 2016-10-20 | Council Of Scientific & Industrial Research | A device for groundwater iron removal and the process thereof |
| CN204848417U (en) * | 2015-08-04 | 2015-12-09 | 四川建环科技有限公司 | Drop aeration reoxygenation device |
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