KR200415168Y1 - Calcium hydroxide feeding apparatus - Google Patents

Abstract

The present invention relates to a slaked lime injecting device, and according to the present invention, a partition wall for dividing the body and the area except the lower portion of the body; A reduction motor installed above the body, a rotating shaft extending therefrom, and an impeller fixed to the lower end of the rotating shaft; A purified water introduction pipe communicating with an upper side of the body; Provided is a slaked lime injecting device comprising a slaked lime injecting and agitating tank including a slaked lime sludge or a slurry passage preventing funnel tube installed in an area defined by the body and the outer periphery of the other body facing the purified water inlet pipe. According to the present invention, it is possible to further stabilize and improve the efficiency of flocculation and sedimentation of raw water by maintaining the appropriate alkalinity of raw water, and to maintain the proper alkalinity of purified water. It can prevent corrosion, reduce sludge amount, prevent cloudiness, prevent water drainage and prevent coloration by increasing acidity, and improve the taste of drinking water to the level of spring water.

Description

       Slaked lime feeding device {CALCIUM HYDROXIDE FEEDING APPARATUS}

1 is a flow chart illustrating a conventional general purified water and effluent treatment process.

2 is a conventional general water treatment system diagram.

Figure 3 is a schematic diagram showing a slaked lime input device according to a preferred embodiment of the present invention.

4 and 5 are a longitudinal sectional view and a plan view showing a basic ice of the slaked lime inlet stirring tank which can be preferably used in the slaked lime injecting apparatus according to the present invention shown in FIG.

-Explanation of symbols for the main parts in the drawings-

100: slaked lime input device according to the present invention

1: slaked lime input stirring tank

2: body 3, 3a: bulkhead

4: axis of rotation 4a: impeller

5: primary filter 6: secondary filter

7: purified water inlet 7a: float valve

8: Quicklime or slaked lime Introduction 9: Drain

10: Initiation Well 11: Flowmeter

20: Mixing Paper 21: Mixing Machine

30: flocculator 31: flocculator

40: settler 41: settler

50: filter paper 51: residual chlorine measuring system

52: filter medium 60: water purification paper

61: level gauge 62: residual chlorine measuring system

70: chemical injector 71: chemical mixing tank

72: stirrer 73: water tank

74: water tank 75: pump

76: conveyor 77: dust collector

80: chlorine injector 81: ejector

82: evaporator 83: chlorine bath

84: neutralizing device 85: duct

90: control panel 100 ': water treatment device

101: preventing lime funnel sludge or slurry pass through funnel

102: third filter

110: first thickener 111: second thickener

120: sludge reservoir 130: dehydrator

160: hydrated water storage tank 171: filtration tube

181: deceleration motor 182: base

       The present invention relates to a slaked lime input device, and more particularly, by maintaining the proper alkalinity of the raw water can further improve the flocculation and sedimentation efficiency of the raw water and at the same time stabilize, while maintaining the proper alkalinity of the purified water This prevents the corrosion of the pipe due to the excessive amount of erosion free carbonic acid, reduces the amount of sludge, prevents the clouding phenomenon, prevents water drainage, and prevents the coloring phenomenon due to the increase in acidity. It relates to a slaked lime dosing device that can be improved to a level of spring water.

       Generally, water treatment methods for obtaining drinking water include flocculation of suspended solids, solid-liquid separation, condensation of dissolved components, oxidation, biochemical denaturation, adsorption, ion exchange, and bacteria. And agglutination, filtration, sterilization against viruses, and neutralization of acids and alkalis. Such methods are purified by appropriate combinations according to various requirements such as water quality of raw water and water purification purposes.

       1 and 2 are a flow chart illustrating a conventional general purified water and effluent treatment process and a conventional general purified water treatment system diagram, which will be briefly described with reference to this for convenience of description. .

       First, the pressurized raw water in an undrinkable state taken from a water intake source such as a river or a reservoir is launched into the impingement 10 through the flow meter 11. The impingement well (10) stabilizes the water level fluctuations at the time of initiation in accommodating the pressurized raw water and controls the quantity of raw water, and evenly distributes the raw water to the facility following the impingement well (10) to determine and control the amount of raw water Purification work such as chemical injection, flocculation sedimentation and filtration can be performed accurately and easily.

The mixed paper 20 inputs various chemicals necessary for water purification to the raw water introduced from the landing well 10 through the chemical injector 70, and rapidly mixes them with the chemical mixer 21 to generate a micro floc. As an input chemical, a flocculant for effectively flocculating and removing various suspended substances, for example, poly aluminum hydroxy chloride (PAC), poly aluminum hydroxy chloride silicate (PACS), Aluminum based such as poly aluminum hydroxy silicate sulfate (PASS) and inorganic based such as iron based iron (sulfur, FeSO ₄ ㆍ 7H ₂ O) and ferric chloride (FeCl ₃ · 6H ₂ O), and Organic systems such as sodium alginate, and the like, and control the alkalinity lowered by the use of the flocculant and maintain an appropriate pH. Water slaked lime (CaO 72%), soda ash for water (99% Na ₂ CO ₃ ), caustic soda (45% NaOH solution and 20% solution), and algae in raw water, synthetic Mention may be made of activated carbon powders for the removal of detergents, phenols and other organic substances.

       The flocculant has two effects, one is to induce particle destabilization as an intrinsic function and the other is to cause pH due to the hydration reaction. The input of slaked lime is essential in the treatment.

       Examples of the chemical injector 70 may include a flocculant injector, an alkali injector, an activated carbon injector, and the like, which may be installed separately or in a mixed form (in the illustrated example, the chlorine injector is indicated by reference numeral 80). Separately as a city).

       The example shown in FIG. 2 is for a solid medicine injector, wherein the solid medicine conveyed by the conveyor 76 is transferred to the medicine injector 70 and then introduced into the chemical mixing tank 71, and the conveyor 76 described above. The dust collector 77 is usually installed on the upper part. On the other hand, the purified water from the water supply source 74 is stored in the water supply tank 73 by the pump 75, and then introduced into the chemical mixing tank 71 described above and mixed with the injected chemicals. In the figure, reference numeral 72 is an agitator.

       In general, a belt conveyor type, a cylinder type, a screw type, and the like are used for conveying a solid chemical, and an orifice type, a rota meta type, a rotary dipper type, a diaphragm type, and the like are used for conveying a liquid chemical.

       The agglomeration paper 30 is to increase the sedimentation effect in the sedimentation basin 40 by agglomerating the microfloc particles produced in the mixed paper 20 by increasing the volume and weight. The bulkhead is installed so as not to form, and a plurality of agglomerators 31 are installed in order to generate a large and hard floc, and the speed of each agglomerator 31 is increased to increase the effect of the deceleration agglomeration, so that the floc is not destroyed. 40).

       Sludge removal of the sedimentation basin 40 is carried out through the settling device 41 and the sludge collector (not shown). In general, the sedimentation basin 40 is a simple installation, easy to maintain and hydraulically stable horizontal flow type is widely used.

       The filter paper 50 is a facility for removing suspended substances which have not been removed during pretreatment such as flocculation and sedimentation by physical and chemical action. As a filtration method, a rapid static filtration (attenuation filtration) method is widely used. As 52, filtration sand (25 cm thick) and / or anthracite (50 cm thick) are mainly used.

       The purified water 60 is a facility for storing the purified water prior to the water supply, and ensures sufficient capacity and prevents the supply of purified water to the water supply area or the customer by the pump.

       On the other hand, the disinfection of the raw water flowing into the water purification plant and the filtered purified water flowing out of the purification plant is performed by adding dilute chlorine water.

       The pre-chlorine treatment not only prevents the growth of algae at the inlet of the mixed paper 20, but also inhibits the growth of microorganisms that inhibit coagulation and aggregation, thereby preventing slime or mud from adhering to the media. In order to prevent the growth of anaerobic bacteria. On the other hand, the post-chlorine treatment is carried out in the purified water 60, for the sterilization of microorganisms that were not removed during the pre-chlorine treatment.

       Referring to FIG. 2, chlorine stored in the chlorine tank (still) 83 is transferred to the chlorine injector 80, mixed with water supplied from the water supply source 74, and then supplied through the ejector 81. In general, pre-chlorine input is performed at the inlet of the rapid mixing paper 20, heavy chlorine input for maximizing the chlorine treatment effect is performed at the sedimentation basin 40, and post-chlorine input is performed at the purified water 60.

       A duct 85 is installed above the chlorine injector 80, the ejector 81, and the chlorine tank 83 to collect evaporated harmful chlorine gas, and then neutralize it by the neutralizing device 84, and then discharge it into the atmosphere. Let's do it.

       In the figure, reference numeral 61 is a water gauge, 62 is a residual chlorine meter, and 82 is an evaporator.

       On the other hand, the control panel 90 by controlling the amount of the flocculant, alkali agent, chlorine, and the like and the timing of the addition, as described above, so that the water purification process can be carried out efficiently as a whole.

       Subsequently, referring briefly to the wastewater treatment apparatus with reference again to FIG. 1, the primary concentration tank 110 and the secondary concentration tank 111 for concentrating the sludge sedimented from the sedimentation basin 40 and the concentrated supply supplied therefrom Dehydrator for sludge storage tank 120 for storing sludge and concentrated sludge conveyed from sludge storage tank 120 to dehydrate and cake to facilitate final disposal and transport of sludge to reduce volume and facilitate transportation and disposal. 130. Dewatered and caked sludge is landfilled in a landfill.

       According to the above-mentioned chemical input device and method, especially alkali chemicals input device and method in the conventional general water treatment equipment as described above, calcined lime is injected in the form of liquid by using dilution water or through a hopper in the form of powder. Although the solubility of hydrated lime is very low at about 1.02% even in the case of liquid injection, it is very difficult to make a quantitative injection. There is a concern that this may occur, and in this case, there is a concern that the sedimentation basin will become cloudy, and as the amount of sludge generated increases, the sludge treatment cost increases, and if it does not meet the standard value, the pipeline includes an increase in acidity. Not only will it cause premature wear and loss of facilities. , Coloration phenomenon concerns result in (an iron-rust, zinc-cloudy water, copper blue water and the like) also had a high problem.

As a conventional method for solving the above-mentioned problems, NaOH (40% or 20%) is merely used for the purpose of increasing the OH ^- component in order to efficiently maintain the hydration reaction rate of the flocculant and obtain a good flocculation reaction effect. Is proposed, but alkalinity is basically using OH ^- of divalent cation metal, so this method is also contrary to the principle, which is incorrect because of low solubility of Ca (OH) ₂ . The increase in Na ⁺ ions in the purified water causes a serious problem of causing high blood pressure in the drinking local people, and furthermore, NaOH is expensive and basically toxic.

       In addition, LI (Langelier Index), which is represented by the following formula presented in the 「Maintenance Management」 section of the water supply facility standard, has a negative value indicating corrosiveness in almost all water purification plants in Korea that adopts the rapid filtration method.

       LI = pH value of water-pHs

Where pHs = 8.313-log [Ca ⁺⁺ ]-log [A] -S)

In the above equation, pHs exceed 7.5 for most of Korea's water systems except for the upstream areas of the Nakdong and Bukhan rivers, and most of the raw water is 7.5> pH except when the algae thrives, so LI is almost negative.

       In spite of this fact, there is no interest in increasing alkalinity in water purification treatment, but focuses only on lowering turbidity.

       From the foregoing, it is possible to have an improved taste of tap water and to effectively inject a quantity of water, thereby avoiding the water drainage caused by the excessive injection of lime, and to prevent sludge increase and settling and downstream turbidity. There has been a need in the art for the development of an effective slaked lime dosing device, a slaked lime dosing method and a water purification treatment method which can prevent wear and loss of metals and concrete facilities by maintaining a weak acidity downstream of the chemical injection chamber of a water purification plant.

Therefore, the purpose of the present invention is to commercialize the continuous process, and the quantitative injection of slaked lime is possible to maintain the proper alkalinity of raw water, thereby effectively improving the efficiency and stability of the flocculation and sedimentation of the raw water and maintaining the appropriate alkalinity of the purified water. It can make a significant contribution to preventing corrosion of pipes and concrete structures caused by erosion free carbonic acid at the source and to improve the taste of tap water to the level of spring water. An object of the present invention is to provide a slaked lime injecting device that is applicable as an auxiliary facility in water purification equipment such as a complex.

According to a preferred aspect of the present invention for achieving the above object of the present invention, the body and the partition wall for dividing the area except the lower portion of the body; A reduction motor installed above the body, a rotating shaft extending therefrom, and an impeller fixed to the lower end of the rotating shaft; A purified water introduction pipe communicating with an upper side of the body; Slaked lime characterized in that it is composed of a slaked lime input stirring tank including at least one slaked lime sludge or slurry passing prevention funnel pipe installed in the area defined by the body and the inner periphery of the other body facing the water purification introduction pipe Provide an input device.

Here, a primary filter is installed below the slaked lime sludge or slurry passage preventing funnel pipe in an area defined by the body inner periphery of the other side facing the purified water introduction pipe and the partition wall, and passes through the sludge or slurry. It is preferred that a secondary filter is formed above the prevention funnel tube.

In addition, a third filter may be further installed on the upper end of the neck of the slaked lime sludge or the slurry passage preventing funnel tube.

      Further, the primary and tertiary filters are lime filter sludge and sieve filters for slurry filtration, and the secondary filters are microfilters, nanofilters, or microfilters and nanofilters. The height of the secondary filter is preferably lower than the height of the purified water inlet pipe.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

3 is a schematic view showing a slaked lime input device 100 according to a preferred embodiment of the present invention, Figures 4 and 5 are preferably used in the slaked lime input device 100 according to the present invention shown in FIG. As a longitudinal cross-sectional view and a top view which show the basic structure of the slaked lime input stirring tank 1 which can be used, it demonstrates together for convenience of description.

       As shown in the longitudinal cross-sectional view of FIG. 4, the basic ice of the slaked lime input stirring tank 1 is a partition wall which divides the cylindrical body 2 and the region excluding the lower part of the body 2 into two semi-cylindrical zones. It consists of (3), the deceleration motor 181 is provided above and the impeller 4a is provided in the lower end part of the rotating shaft 4 extended from the said deceleration motor 181.

       Here, the rotating shaft 4 is accommodated in and out of the partition 3, the impeller 4a is located below the bottom opening 3b of the partition.

       The number and shape of the impellers 4a described above are arbitrary and not limitative in the present invention.

       From the plan view of FIG. 5, the specific shape of the partition 3 can be clearly understood. In the illustrated example, the partition 3 is formed as a double partition and the part in contact with the body 2 is a double partition. The central portion in which the rotating shaft 4 is accommodated is formed with a double partition wall, but the shape of the double partition wall is optional and not limited in the present invention as long as the rotating shaft 4 can be accommodated in the central portion thereof. It is a matter of course that both sides of the double partition wall are formed in parallel, a hollow pipe in the center and a single wall are formed on both sides, or any other shape.

Again, by reducing to Figure 3 will be described with respect to the slaked lime injecting device 100 according to a preferred embodiment of the present invention.

The basic configuration of the slaked lime input stirring tank 1 is a body 2 (cylindrical in the illustrated example, but the shape thereof is arbitrary in the present invention), and a hollow having a hollow portion, and the body 2 described above. A partition wall 3 which bisects an area except for the lower part of the wall; A reduction motor 181 installed above the body 2, a rotating shaft 4 extending therefrom, and an impeller 4a fixed to a lower end of the rotating shaft; A purified water introduction pipe 7 communicating with an upper side of the body 2; At least one slaked lime sludge or slurry passage preventing funnel tube 101 provided in the area defined by the inner periphery of the body 2 on the other side opposite to the purified water inlet tube 7 and the partition wall 3; 1 provided in the area defined by the inner periphery of the other body 2 opposite to the purified water introduction pipe 7 below the slaked lime sludge or slurry passage preventing funnel pipe 101 and the partition 3 above. The neck of the primary filter 5, the secondary filter 6 formed vertically above the sludge or slurry passage preventing funnel tube 101, and the slaked lime sludge or slurry passage preventing funnel tube 101 described above. It consists of the 3rd order filter 102 installed in the upper part of an upper part. Here, in the illustrated example, only one sludge or slurry passage prevention funnel tube 101 is formed, but in some cases, 2-3 may be installed, and in the present invention, the number of funnel tubes 101 is limited. no.

The location of the slaked lime sludge or slurry passage preventing funnel tube 101 is a compartment other than the compartment in which the purified water introduction pipe 7 is located among the two compartments (not shown) which are bisected by the partition wall 3. Arranged at any position, preferably about the middle portion of, the primary filter (5) serves to prevent the movement of sludge or slurry due to the addition of slaked lime. That is, in the narrow neck portion of the lower side of the lime-lime sludge or slurry passage preventing funnel tube 101 by Bernoulli theorem, the flow rate of the water (including the lime-lime sludge or slurry) in which the rising slaked lime is dissolved is increased and the upper portion of the neck portion is increased. As the width gradually increases, the flow velocity decreases, so that the relatively large slaked lime sludge or slurry does not move upward but falls to the lower side and is agitated again, so that only the dissolved slaked lime can pass. The material of the slaked lime sludge or the slurry passage prevention funnel tube 101 may be made of metal in terms of durability and maintenance, but the material is not limited thereto.

The primary and tertiary filters 5 and 102 also serve to additionally prevent the movement of sludge or slurry due to the introduction of slaked lime, and may be various kinds of filters suitable for achieving this purpose. It may be preferable from the viewpoint of durability and maintenance that the filter in the form of a plate or box sieve, in particular a metal sieve filter. These primary and tertiary filters (5) (102) are optional in the present invention, and may only install a hydrated lime sludge or slurry passthrough funnel tube (101).

The position of the secondary filter 6 is above the hydrated lime sludge or slurry passage preventing funnel tube 101 and is preferably installed vertically slightly below the position of the purified water introduction tube 7. One secondary filter 6 is composed of a microfilter and / or nanofilter (nanofilter), these filters themselves are known, commercially available and will not be described in detail.

Meanwhile, quicklime or slaked lime introduction part 8 may be formed above the body 2, and a drain 9 may be formed below the base 2, and a base 182 may be installed below the body 2. Can be.

Moreover, by providing the float valve 7a in the opening part of the above-mentioned purified water introduction pipe 7, a continuous process can be commercialized.

Therefore, the mixed water 200 of purified water and slaked lime introduced from the purified water introduction pipe 7 by the operation of the float valve 7a is thoroughly stirred by the rotation of the impeller 4a, and then the slaked lime sludge or the slurry passage preventing funnel Slurry sludge or slurry cannot be moved upward by the pipe 101 and the primary and tertiary filters 5 and 102, and only water in which the slaked lime is completely dissolved by the secondary filter 6 is filtered. It is discharged through the reservoir 160 through.

In addition, the illustrated example shows a structure in which only one slaked lime input stirring tank 1 is installed, but once again the same as the slaked lime input stirring tank 1 to filter out the slaked lime fine particles, sludge or slurry by recrystallization. The recrystallized filtration tank of the structure may be formed in communication with the slaked lime input stirring tank 1.

For reference, a description will be given of the slaked lime input method using the above-described slaked lime input device 100 as follows.

(a) a step of stirring slaked lime mixed water to introduce purified water and add slaked lime, followed by physical stirring;

(b) sodium chloride, or MgCl ₂ or FeCl ₂ , to increase the solubility of slaked lime from about 0.16% up to about 0.24%, ie up to 50% by the inert salt solution effect; Adding an inert salt to the chloride of the divalent cation metal in a ratio of hydrated lime: noncorrelating salt = 100: 10 to 50 parts by weight and stirring;

(c) a primary filtration step of removing sludge or slurry due to slaked lime or the like by means of a primary filter through an upstream flow;

(d) a secondary filtration step of performing filtration by a secondary filter; And

(e) Input step into raw water for metering the obtained slaked lime completely dissolved water into raw water.

Optionally, in addition to the method described above, (d1) the recrystallization filtration by a filter may be further performed following step (d).

Alternatively, in addition to the above method, the slaked lime introduced in the above mixing step may be quantitatively added.

As described above, according to the slaked lime injecting device according to the present invention, it is possible to quantitatively inject the slaked lime to maintain the proper alkalinity of raw water, thereby effectively improving the efficiency and stability of the flocculation and sedimentation of raw water, Water can be avoided, and sludge increase and sedimentation basin and downstream turbidity can be prevented, and by maintaining proper alkalinity of purified water, it is possible to prevent corrosion of metal pipes and concrete structures due to erosion free carbonic acid. At the same time, the taste of tap water can be improved to the level of spring water.

Although the present invention has been described in detail, a person of ordinary skill in the art may make various changes and modifications from the present invention without departing from the scope of the present invention, but this is also within the scope of the present invention. You must understand.

Claims (4)

        A partition wall bisecting the body and an area excluding the lower part of the body;         A reduction motor installed above the body, a rotating shaft extending therefrom, and an impeller fixed to the lower end of the rotating shaft;         A purified water introduction pipe communicating with an upper side of the body; Slaked lime characterized in that it is composed of a slaked lime input stirring tank including at least one slaked lime sludge or slurry passing prevention funnel pipe installed in the area defined by the body and the inner periphery of the other body facing the water purification introduction pipe Input device.         The method of claim 1, A primary filter is installed below the slaked lime sludge or slurry passage preventing funnel tube in an area defined by the body inner circumference of the other side facing the water purification introduction tube and the partition wall, and the sludge or slurry passage preventing funnel A slaked lime injector, characterized in that the secondary filter is formed above the tube.         3. The slaked lime injector according to claim 2, wherein a third filter is further provided at an upper end of the neck portion of the slaked lime sludge or the slurry passage preventing funnel tube. The method of claim 2 or 3, Said primary and tertiary filters are hydrated lime sludge or sieve filters for slurry filtration, said secondary filters are microfilters or nanofilters, and the height of said secondary filters is said integer A slaked lime dosing device located below the height of the introduction tube.

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