KR100310043B1 - Instantaneously mixing method of chemical by hydraulic turbulence - Google Patents

Abstract

PURPOSE: An instantaneously mixing method of chemical by hydraulic turbulence is provided, which can diffuse coagulants homogeneously in a few minutes complying with any change of water flow, by hydraulic energy only without any power consumption. CONSTITUTION: The method comprises the following steps: (i) over flow raw water coming from a gauging well through the top of vertical turbulence generating pipe(50) equipped with an open expanded weir(54), thus generating vertical turbulence by collective drop through the vertical turbulence generating pipe(50), this step being repeated twice at least; (ii) feed chemical to the spot where the turbulence is generated to diffuse chemical to water by hydraulic turbulence; and (iii) after the hydraulic turbulence, the effluent raw water is horizontally rotated to move horizontally.

Description

Instantaneous mixing method of chemicals by hydraulic vortex and its device

The present invention relates to an instantaneous mixing method and a device for chemically mixing chemicals into raw water as a pretreatment step for agglomeration of fine particles suspended in raw water in water purification treatment of tap water, and in particular, hydraulically vortex without using power. It relates to a method and apparatus for instantaneous mixing of the drug by the hydraulic vortex by allowing the drug to be mixed more quickly and uniformly.

Water treatment system uses simple treatment method to disinfect according to raw water quality, slow filtration method to slowly filter raw water through relatively thin sand layer, and suspend material contained in raw water layer by flocculation beforehand and settle it. There is a rapid filtration method. Particles with a particle diameter of 0.01 mm or more in the suspension suspended in raw water can be removed by ordinary precipitation. However, colloidal particles having a particle diameter of 1 μm or less hardly precipitate, and most of them pass through the four layers of filter paper as they are. Therefore, in the case of the rapid filtration method, the suspended colloidal particles in the raw water introduced must be aggregated in the form of flocs that can be precipitated and filtered. The pretreatment step of this aggregation involves mixing and mixing the flocculating chemicals. In addition, even in slow filtration, when turbidity of raw water is 30 degrees or more, turbidity after precipitation is still high and the occlusion period of the filtration layer is accelerated, and thus, a flocculation agent injection facility may be required to increase the filtration efficiency.

Agglomeration chemicals are classified into flocculants for floc formation, alkaline agents for pH adjustment, and flocculent aids. As the flocculant, aluminum salts such as aluminum sulfate and polyaluminum chloride are mainly used. As alkali agents, slaked lime, soda ash, or liquid calcined soda are used. As flocculating aids, active silicic acid and sodium alginate for tap water are used. In addition, various chemicals are used depending on the condition of the raw water such as powder activated carbon for odor removal.

Given that the main purpose of introducing computer control systems in water quality management is the automatic injection of water treatment chemicals, automatic injection of chemicals is possible only under the premise that uniform mixing occurs as soon as possible on the chemical mixing paper. . In other words, when raw water flows into the flocculation paper due to poor miscibility of the flocculant, the flocculation rate of floc is low and the precipitation efficiency decreases, so that the burden of the filter paper becomes very large and it is difficult to manage normal water quality. In addition, agglomeration sedimentation battery is usually installed in two or more (운영) in parallel operation, in this case, if the flocculation and sedimentation effect is different in each region, the burden of filter paper due to uneven sedimentation becomes greater. Therefore, water treatment chemicals should be mixed evenly in order to achieve uniform precipitation effect in each flocculation and sedimentation system by reacting with all suspended substances evenly in raw water.

The chemicals introduced into raw water can theoretically be mixed evenly if the mixing time is long after they are added. However, the flocculating chemicals are hydrolyzed in water and have a very fast characteristic of causing polymerization reaction with suspended colloid particles. It should be able to spread evenly and instantaneously in time. As described above, due to the characteristics in which the equal mixing condition of the flocculating drug and the rapid reaction condition are mutually opposite, the technical development of the drug mixing system capable of satisfying the two conditions is becoming a problem.

Conventional techniques for mixing the injected chemicals are largely divided into a method of using the energy of the water flow itself and a method of operating the required mechanical energy from the outside.

In order to use the energy of the water flow itself, there is a method of spreading the injected chemicals by installing a vertical or horizontal flow type or a reservoir plate in the mixed paper to change the flow direction rapidly and causing turbulence, etc. (partial flume), turbulence in the pipeline and turbulent flow from the nozzle jet. In this way, there is no mechanical operating part, so there is no failure and easy maintenance, but the equipment is not elastic and it is applied only within a predetermined flow range.

On the other hand, the mixing method for operating the required mechanical energy from the outside includes a flash mixer method that is installed at the end of the vertical shaft and mixed by rotating the stirring blade located in the water stored in the mixing paper at a peripheral speed of 1.5m / s or more There is a pump diffusion method in which a part of raw water is pressurized by a pump to collide with the remaining raw water. Among them, in case of flash mixer type, the stirring intensity can be adjusted by changing the rotation speed of the stirring blade, so it is adaptable to the change of flow rate, but it is difficult to maintain due to many mechanical failures, and the pump diffusion method requires more power than the flash mixer. I have a problem.

1A and 1B of the accompanying drawings show a conventional chemical mixing paper employing a flash mixer, which is currently used a lot. In these drawings, the same reference numerals are assigned to corresponding parts. In the mixed mixer of the flash mixer method, the raw water flowing from the landing well (not shown) is filled up to the top height of the inlet ware 2 installed in the inlet 1 and then overflowed. The overflowed water flows into the bottom side of the mixed paper 4 along the channel 3 at the bottom thereof with the chemical introduced from the chemical injection point 7. In the mixed paper 4, the chemicals are diffused and mixed by the stirring blades 12 of the flash mixer 8 installed in the internal water of the mixed paper 4 while being raised to the upper height of the outlet weir 5. The outlet weir 5 will flow and flow to the outlet 6. In the outlet part 6, it flows to the aggregation paper which is not shown in figure. The flash mixer 8 installs a support 9 above the mixed paper 5, installs a motor and a reducer 10 thereon, and stirs the blade 12 at the end of the vertical shaft 11 extending into the water of the mixed paper 4. ) Is installed. In the conventional chemical mixing paper, since the motor and the reducer 10 must be operated for 24 hours, there is a problem in that it is difficult to maintain due to a lot of mechanical force and high power consumption.

It is an object of the present invention to provide a method for instantaneous mixing of chemicals for water treatment using hydraulic vortices to shorten the mixing time of the injected chemicals while retaining the advantages of the method of maximizing the energy of the water stream itself without using power. have.

Another object of the present invention is to implement the instantaneous mixing method of water treatment chemicals using hydraulic vortex to reduce the mixing time of the injected chemical while having the advantage of using the method to maximize the energy of the water flow itself without using power. To provide a device.

1A and 1B are longitudinal sectional views showing the structure of a chemical mixed paper using a mechanical stirrer in a conventional standard water treatment system.

2 is a plan view showing an embodiment in which the instantaneous admixture for chemicals due to hydraulic vortex is installed in the pipeline between the landing well and the flocculation basin according to the method of the present invention.

3 is a cross-sectional view taken along line III-III of FIG.

4 is a detailed cross-sectional view of the instantaneous admixture of medicine shown in FIG.

5 is a plan view of the expandable weir in the instantaneous admixture of medicine shown in FIG.

6a and 6b is a cross-sectional view showing an embodiment implemented by applying the instantaneous mixing method of the drug by the hydraulic vortex according to the present invention to the existing drug mixing paper.

<Description of the symbols for the main parts of the drawings>

20: initiation well 30: flocculation paper

40,40 ': Head tank 50,50': Vertical vortex forming tube

54: expansion type wear 55: raw water guide plate

56: Raw water classification round bar 60,60 ': Horizontal vortex transport pipe

61: spiral wing 70,70 ': chemical injection point

In the instantaneous mixing method of the drug by the hydraulic vortex according to the present invention to achieve the first object described above, the raw water supplied from the impingement crystal overflow at the upper end of the vertical vortex forming pipe having an expandable weir vertically open to the vertical Hydraulic vortices are formed in the vortex forming tube by the collective drop, and the chemicals are directly injected into the part where the hydraulic vortices are formed, so that the injected chemicals are diffused into the raw water by the hydraulic vortices.

In this way, when the raw water supplied from the landing well is transferred to the flocculation basin, a hydraulic vortex is formed by the dropping of the raw water and the flocculating chemical is directly put therein, and the chemical introduced by the diffusion of the hydraulic vortex is instantaneously mixed and Can spread. Therefore, it is possible to achieve uniform mixing by instantaneous diffusion of the raw water before the hydrolysis after the input of the flocculating chemicals without using power.

The chemical mixing method of the present invention uses a vertical vortex forming tube having an expandable weir that is vertically upward to inject raw water supplied from the immersion well around the vertical vortex forming tube, so that the raw water inlet connected to the immersion well is introduced. A cylindrical head tank with a pipe (or an exterior or a structure forming an outer wall) is installed around the vertical vortex forming pipe, and the outlet of the vertical vortex forming pipe is passed through the head of the head to the outside of the head tank to connect with the flocculation basin. It can be implemented by appropriately adjusting the wall height of the expansion weir and the water level of the flocculent so as to maintain the constant drop.

Therefore, the second object is the instantaneous mixing device of the chemicals for receiving water from the watering well and instantaneously mixing the water treatment chemicals into a flocculation basin, and the head tank into which the raw water supplied from the watering well flows in. It is installed in the center of the head tank, and has a swept ware which is vertically open at the top, and forms a hydraulic vortex inside by dropping the raw water flowing into the head tank to form a vertical vortex that flows out to the flocculent. Tube and the upper side of the vertical vortex forming tube is achieved by the instantaneous admixture of chemicals by hydraulic vortex, characterized in that the means for injecting the drug in the upper center of the vertical vortex forming tube.

The instantaneous mixing method of the present inventors is provided with a plurality of the head and the vertical vortex forming tube, connecting the inlet of the head of the head tank located in front and the outflow portion of the vertical vortex forming tube installed in each chickenpox tank It is connected to the inlet of the chicken pox tank located next, and connects the vertical vortex forming tube located at the end with the coagulation paper to form the above hydraulic vortex in each vertical vortex forming tube step by step and input the necessary chemicals in each step. By clarifying the drug injection point by drug to increase the effect of the drug.

In addition, by connecting the horizontal vortex forming tube having a spiral wing is installed inside the outlet side of the vertical vortex forming tube, the moment of chemical introduced by continuously forming the vortex by the spiral wing after the hydraulic vortex generated by the above-described dropping The diffusion and miscibility effect can be further enhanced.

Such embodiments of the present invention will be described in detail with reference to the accompanying drawings.

2 and 3 of the drawings related to the present invention shows an apparatus for performing the instantaneous mixing method of the drug in two steps. As shown, two drug admixtures according to the present invention are installed as a facility for the function of the mixed paper installed between the landing well 20 and the flocculation paper 30.

Here, the landing well 20 and the agglomeration pond 30 are conventional, that is, in a standard water treatment facility, the landing well 20 is installed to introduce raw water from a water source and supply it to a mixed pond. In the present embodiment, when the raw water introduced into the watering well 20 reaches a certain level or more, the outflow ware 21 is overflowed and flows into one side chicken pore tank 40 of the admixture according to the present invention through the outflow pipe 22. It was made. The flocculation paper 30 is for flocculating the suspended matter in floc state in which a drug such as a flocculant is charged and mixed, and is flocculated. The inflow pipe 31 and the inlet conduit 32, and the inlet conduit 32 for receiving the water mixed with the chemicals by the admixture according to the present invention flows into each of the flocculation paper (30) Inlet 33 is included.

The instantaneous admixture of medicine according to the present invention, which is installed between the watering well 20 and the flocculation paper 30, is a cylindrical head tank 40, 40 'and a head having a relatively large diameter capable of receiving water. Vertical vortex forming tubes 50 and 50 'installed to form hydraulic vortices in the tanks 40 and 40', respectively, and the vertical vortex forming tubes 50 and 50 'deliver chemically mixed water in a horizontal direction. It includes a horizontal vortex feed pipe (60, 60 '), and the chemical injection point (70, 70') on the head tank (40, 40 ').

Chickenpox tanks 40 and 40 'are inlets 41 and 41' for respective chemical injection points 70 and 70 ', and inlets 42 and 42' opened to receive water from one side of each lower part. Has The inlet 42 of the first head tank 40 is connected to the outlet pipe 22 of the landing well 20 by a flange joint, and the inlet 42 'of the second head tank 40' is the first head tank ( 40 is connected to the horizontal vortex feed pipe 60 on the side of the vertical vortex forming pipe 50 in a flanged joint.

The vertical vortex forming tubes 50 and 50 'installed in the first and second head tanks 40 and 40' are respectively enlarged and enlarged weirs 54 and as shown in FIGS. It has a height adjustment tube 51 formed integrally under the expandable weir (54), and a head connector screw connection pipe (53) for connecting the height adjustment tube (51) to enable height adjustment. Expansion ware 54 is in the form of a funnel, and several raw water guide plates 55 radially installed on the inner circumferential surface thereof, and raw water sorting rods formed by attaching an annular rod to the top of the several raw water guide plates 55 in an annular shape. 56). Height adjustment tube 51 is formed on the inner peripheral surface of the lower half has a screw portion 57 that is screwed with the screw connection pipe 53 for the head adjustment. The vertical vortex forming pipe (50, 50 ') is connected to the upper end is integrally connected to the screw connection pipe (53) by airtight welding, and to the side through the wall of the head tank (40, 40') It has a protruding outlet 59. The outlet 59 is connected to the aforementioned horizontal vortex feed pipes 60 and 60 'by flange joints. In the drawing, reference numeral 52 denotes the water level in the vertical vortex forming tubes 50 and 50 ', and 58 denotes a bubble which forms air turbulence by introducing air introduced together when the raw water falls by the expandable weir 54. Would be odd. This will be described later in detail.

The overflow height of the vertical vortex forming pipes 50 and 50 'in the head tanks 40 and 40' stabilizes the hydraulic vortices caused by the aforementioned droppings within each head of the landing well 20 and the flocculant 30. It can be adjusted by the height adjustment structure as described above to meet the conditions that can be generated. The free fall of the raw water overflowing the expandable weirs 54 of the vertical vortex forming pipes 50 and 50 'varies with the flow rate, and when the inflow flow rate is high, the outflow weir level rises and when the inflow flow rate is low, the outflow flow weir There is an advantage that the instantaneous instantaneous mixing effect is always obtained due to the automatic adjustment of the drop head according to the inflow flow conditions such as the water level is lowered. And through the height adjustment structure of the expandable weir (54) was configured to adjust the optimum hydraulic conditions in the early days of the facility.

2 and 3, each of the horizontal vortex conveying tubes 60 and 60 'has a spiral blade 61 formed in the inner wall of the tube, and the vertical swirl forming tube 50 is formed by the spiral blade 61. 50 '), after forming a hydraulic vortex, the vortex is formed continuously in the outflow process.

Referring to the instantaneous mixing effect of the drug according to the embodiment described above, when the raw water introduced into the landing well 20 from the water intake in Figure 2 overflows the outflow wear 21, the overflow of the raw water is the The outlet pipe 22 is introduced into the first head tank 40 through the inlet 42 of the first head tank 40 flanged thereto. As the water level rises, the raw water flowing into the first head tank 40 flows into the upper end of the vertical vortex forming pipe 50 installed therein, that is, into the opening of the expansion weir 54. At this time, the narrowing shape of the expandable weir 54 results in a form in which the raw water is collected, and the flow velocity thereof is increased, and in this state, it falls with a constant drop. Therefore, in the vertical vortex forming tube 50, a hydraulically strong vortex is formed by the continuous drop of the raw water and the increase of the flow velocity. In the vertical vortex forming tube 50, air also flows in as water collides with water filled with a predetermined level, and the introduced air flows into the water according to the drop and flow rate of the raw water, Floating force rises to the surface and disturbs the water flow therein. (Described in FIG. 4) In addition, the air introduced by the collective drop is raised and destroyed at the surface of the water. It also plays a role to further enhance the instantaneous mixing effect.

The present invention uses the hydraulic vortex and disturbance action formed in the vertical vortex forming tube 50 as described above, through the chemical inlet 41 of the chickenpox tank 40 from the chemical injection point 70 is installed on the top The chemicals introduced into the vertical vortex forming tube 50 are diffused.

Meanwhile, as shown in FIGS. 3 and 4, the raw water flowing over the top of the vertical vortex forming tube 50 maintains the balance of the collective drop by the several raw water guide plates 55 on the inner surface of the expandable weir 54. By doing so, the formation of the above-mentioned hydraulic vortex is promoted, and in the raw water sorting ring 56, the raw water is divided into two layers, thereby promoting the disturbing action. Therefore, the diffusion action of the injected drug is promoted, so that the instantaneous diffusion of the drug can be achieved a uniform mixing.

The raw water mixed with the primary chemical is introduced into the second head tank 40 'along the horizontal vortex transport pipe 60, and the spiral blade 61 installed in the horizontal vortex transport pipe 60 continuously rotates the raw water. The drug admixture effect is further enhanced.

The first mixed water introduced into the second head tank 40 'again flows through the vertical vortex forming pipe 50' installed in the second head tank 40 'with the same action as described above. After the second chemicals are mixed again from the point 70 'and introduced into the flocculation paper 30 through the horizontal vortex transfer pipe 60'.

In the above-described embodiment, for example, the first chemical injection point (70) located in the first step of the above-mentioned flocculation chemicals to the alkali agent for pH adjustment, and the next chemical input point (70 ') of the flocculant to the input do. If necessary, it is a matter of course that more instantaneous admixtures of the drug can be arranged as described above to separate the coagulant adjuvant or another drug or the same drug not mentioned.

In the above embodiment, when a new water purification facility is newly constructed, it is possible to implement a simple and more effective instant mixing device for chemicals while excluding a mixed area facility that takes up a large area and requires large-scale construction.

6A and 6B show an embodiment to be described below, in which case the mixing apparatus of the present invention can be simply implemented without greatly changing the existing mixed paper in the case where it is desired to improve the existing mixed paper without constructing a new water purification facility. In this drawing, since the existing mixed paper facility is used, the same reference numerals are given to the same parts as in FIGS. 1A and 1B for convenience.

Instantaneous admixture of the drug of the present invention as shown, as shown in the existing admixture, the inlet 1 or admixture (4) itself to serve as the above-described chicken pox tank, and there is a vertical vortex forming tube 50 is provided as shown. The vertical vortex forming tube 50 has an expandable weir 54 whose one end is curved upwardly and opened at the upper end thereof, and the other end thereof is below the inlet conduit 3 or the storage wall 13. It is installed to penetrate the portion and communicate with the mixed paper 4 or the outlet 6. Here, the upper end of the expandable weir 54 is slightly lower than the water level 1a of the inlet 1, and is positioned sufficiently higher (about 20-30 cm) than the water level 6a of the outlet 6, and if possible, the enlarged wear Center 54 on the inlet 1 or the blended paper 4. And the drug injection point (7) is located directly on the expandable weir 54 of the vertical vortex forming pipe 50 to install the drug to the center of the expandable weir (54). Here, FIG. 1A illustrates that the existing mixing paper 4 is used as a back mixing paper and the mixing mixer 4 can be further enhanced with the flash mixer 8 including the motor and the reducer 10 installed therein. will be.

In this configuration, the incoming raw water is filled up to the height of the expandable weir 54 around the vertical swirl forming tube 50, and when the water level rises above the height of the expandable weir 54, the raw water is the vertical swirl forming tube 50. ) Is overflowed to the inside of the expansion weir (54), and in the vertical vortex forming pipe (50) to fall while maintaining the free fall as much as the difference between the upper end and the water level (6a) of the outlet portion (6) . That is, the repair as described above by the falling of the water flowing into the inlet 1 or mixed paper 4 falls with a certain drop into the expansion weir 54 of the vertical vortex forming pipe 50 Vortex is generated.

Substantially, the existing admixture was improved to the instantaneous admixture of the drug according to the present invention, it was confirmed that the injected drug is instantaneously spread within 2 to 5 seconds.

As described above, the present invention uses a hydraulic vortex caused by the falling down of water to diffuse the flocculating chemicals within a few seconds and achieve a uniform effect. The device that implements the instantaneous mixing method of the drug of the present invention does not use any separate power, and uses the energy of the water flow itself, so there is no power waste, and thus maintenance is easy. In particular, the present invention overcomes the problems such as the point of injection for each drug and the rapid diffusion of the drug in the existing drug admixture method and can flexibly respond to changes in flow rate. As described above, the present invention enhances the chemical mixing function, which is a pretreatment step for flocculation of suspended solids in raw water, thereby contributing to improving the water quality of treated water such as tap water, and providing an economic and reliable instantaneous mixing method and apparatus for chemicals. It is an effective invention.

Claims (9)

In the instantaneous mixing method of the chemicals for mixing and mixing the necessary chemicals, including the coagulant drug to the raw water supplied from the impingement, the vertical vortex forming tube having an expandable weir vertically open the raw water supplied from the impingement Overflow at the upper end of the vortex to form a hydraulic vortex by the dropping of the aggregate inside the vertical vortex forming tube, and directly put the chemical into the part where the hydraulic vortex is formed, the injected chemical is diffused into the raw water by the hydraulic vortex Method of instantaneous mixing of the drug using a hydraulic vortex characterized in that. The method of claim 1, wherein the step of forming the above-mentioned hydraulic vortex is performed at least twice, and the chemicals are introduced at each step. The method of claim 1 or 2, further comprising horizontally transporting the raw water flowing out after the step of allowing the hydraulic vortex to be formed horizontally. An instantaneous mixing device for chemicals for receiving water from a watering well and for instantaneously mixing the water treatment chemicals into a flocculation basin, wherein the headwater tank into which the raw water supplied from the above watering water flows is installed, and is installed in the center of the inside of the water tank. Vertical vortex forming tube having a vertically-shaped open ware at the top and collecting and dropping the raw water flowing into the chicken pox tank to form a hydraulic vortex therein and then flowing it toward the flocculation site, and the vertical vortex forming tube The upper side of the instantaneous mixing device for chemicals by hydraulic vortex, characterized in that the means for injecting the drug at the upper center of the vertical vortex forming tube. 5. The hydraulic vortex of claim 4, wherein at least two of the head tank, the vertical vortex forming tube, and the means for injecting the chemical are provided, and the hydraulic vortex is formed in a stepwise manner. Instantaneous admixture of medicines. The hydraulic vortex forming apparatus according to claim 4 or 5, further comprising a horizontal vortex forming tube having a spiral blade which is connected to the outlet side of the vertical vortex forming tube and horizontally rotates the raw water flowing out horizontally. Instantaneous admixture of chemicals by vortex. 5. The instantaneous admixture for chemicals by hydraulic vortex according to claim 4, wherein the height of the expandable weir is installed in the vertical vortex forming tube. According to claim 4, wherein the plural raw water guide plate is provided on the surface of the expandable weir radially provided to maintain the balance of the raw water flowing over the top of the wear fall falling Momentary admixture. 9. The hydraulic vortex according to claim 4 or 8, wherein a raw water classification ring rod is installed at a predetermined height on the inner surface of the expandable weir and divides the flow of raw water overflowing the upper end of the weir into two layers. Instantaneous admixture of medicines.