KR100480807B1 - Calcium hydroxide feeding apparatus having filter, the calcium hydroxide feeding methods using the same and the water purifying methods thereof - Google Patents

Abstract

To provide a filter applied slaked lime injection apparatus capable of effectively improving efficiency and stability of coagulation and sedimentation of raw water, preventing sludge increase and whitening phenomenon, preventing corrosion of metal pipe and concrete structure and improving taste of tap water to a level of spring water, a slaked lime injection method using the apparatus, and a water purification method including the slaked lime injection method using the apparatus. A filter applied slaked lime injection apparatus(1) comprises: a slaked lime injecting agitation tank(1a) comprising a body(2), a partition(3) for dividing a region except a lower part of the body into two equal parts, a speed reduction motor(181) installed at the upper side of the body, a rotary shaft(4) extended from the speed reduction motor, an impeller(4a) fixed to a lower part of the rotary shaft, a purified water introduction pipe(7) connected with one side of an upper part of the body, a primary filter(5) installed in a region defined by the inner circumference of the other side of the body oppositely directed to the purified water introduction pipe and the partition, and a secondary filter(6) formed at the upper side of the primary filter; and a recrystallized material filter tank(1b) comprising a body(2a), a partition(3a) for dividing a region except a lower part of the body into two equal parts, and filters(5a,6a) formed on the inner circumference of the body, wherein heights of the purified water introduction pipe, the secondary filter of the slaked lime injecting agitation tank and the secondary filter(6a) of the recrystallized material filter tank are lowered step by step, a primary filter pipe(171) is formed between the secondary filter of the slaked lime injecting agitation tank and the recrystallized material filter tank, and a secondary filter pipe(172) is formed on the filter of the recrystallized material filter tank.

Description

Calcium hydroxide feeding apparatus having filter, the calcium hydroxide feeding methods using the same and the water purifying methods

The present invention relates to a filter applied slaked lime input device, a method of slaked lime using the same, and a water treatment method thereof, and more particularly, to maintain the proper alkalinity of raw water to further improve the flocculation and sedimentation efficiency of the raw water and to stabilize it at the same time. On the other hand, by maintaining the proper alkalinity of the purified water, it prevents corrosion of the pipe due to the presence of excessive amount of erosive free carbonic acid, reduces the sludge amount, prevents the clouding phenomenon, prevents the water drainage, and the coloring by increasing the acidity. The present invention relates to a filter applied slaked lime input device, a slaked lime input method using the same, and a water purification treatment method thereof, which can prevent the phenomenon and improve the taste of water 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 wastewater 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 a non-drinkable state, taken from a water intake source such as a river or a reservoir, is embarked on the landing well 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 mixed water 21 to generate a micro floc. It is a facility, and as a dosing agent, as an flocculant for effectively coagulating 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 adjust the alkalinity lowered by the use of the flocculant and maintain an appropriate pH. By sufficient coagulation effect for water works hydrated lime as an alkali agent for to manifest (CaO 72%), water works soda ash (Na ₂ CO ₃ 99%) and caustic soda (NaOH 45% solution and a 20% solution), and birds in the raw water, detergent Mention may be made of activated carbon powders for the removal of other organic substances such as phenols.

The flocculant has two effects, one is to induce particle destabilization as an original 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, There is a problem that the coloring phenomenon (iron-green water, zinc-mold product, copper-blue product, etc.) is also high.

As a conventional method for solving the above-mentioned problems, NaOH (45% or 20%) is simply used for the purpose of increasing the OH ^- component in order to efficiently maintain the hydration reaction rate of the coagulant and obtain a good coagulation 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 first object of the present invention is to commercialize the continuous process and can be quantified injection of slaked lime to maintain the proper alkalinity of the raw water to effectively improve the efficiency and stability of the coagulation and precipitation of the raw water, while maintaining the proper alkalinity of the purified water This can make a significant contribution to preventing the corrosion of pipes and concrete structures caused by erosion free carbonic acid and improving 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 can be applied as an auxiliary facility in water purification equipment such as an industrial park.

The second object of the present invention is to commercialize the continuous process and can be quantified injection of slaked lime to maintain the proper alkalinity of raw water to effectively improve the efficiency and stability of coagulation and precipitation of raw water, while maintaining the appropriate alkalinity of purified water Water purification plants, or high-rise buildings or industrial parks, which enable increased solubility of slaked lime, which can contribute significantly to preventing the corrosion of pipes and concrete structures caused by erosive free carbonic acid and improving the taste of tap water to spring water levels. It is an object of the present invention to provide a method of adding slaked lime applicable to water purification in the back.

A third object of the present invention is to provide an effective water treatment method including a slaked lime input method using a slaked lime input device according to the first and second objects described above.

According to a preferred aspect of the present invention for achieving the first object of the present invention, a body; A partition wall having a hollow part and bisecting 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 inlet pipe communicating with an upper side of the body and equipped with a float valve; Consists of a slaked lime inlet and agitator tank including a primary filter installed in the area defined by the inner circumferential edge of the other body facing the purified water inlet pipe and a secondary filter formed above the primary filter. The primary filter is a lime filter or a sieve filter for slurry filtration, and the secondary filter is a microfilter, a nanofilter, or a filter-applied lime, which is a microfilter and a nanofilter. An apparatus is provided.

According to another preferred aspect of the present invention for achieving the first object of the present invention, the body and the partition wall having a hollow part (half part) and dividing the area except the lower part of the body, and the body A deceleration motor provided above and a rotating shaft extending therefrom, an impeller fixed to the lower end of the rotating shaft, a purified water introduction pipe communicating with an upper side of the body, and a body on the other side facing the purified water introduction pipe. A slaked lime input stirring tank including a primary filter installed in an area defined by the inner circumferential edge and the aforementioned partition wall, and a secondary filter formed above the primary filter; A recrystallization filtration tank comprising a body, a partition wall bisecting an area excluding the lower part of the body, and a filter formed at an inner circumference of the body, wherein the secondary water purifying tube and the slaked lime input stirring tank are provided. The height of the filter and the secondary filter of the recrystallization filtration tank is gradually lowered, and a primary filtration tube is formed between the secondary filter of the slaked lime input stirring tank and the recrystallization filtration tank, and the filter of the recrystallization filtration tank described above. There is provided a filter-applied slaked lime input device in which a secondary filtration tube is formed.

According to a preferred aspect of the present invention for achieving the second object of the present invention, (a) the step of introducing the purified water and the addition of hydrated lime, hydrated lime mixed water for performing physical stirring; (b) sodium chloride, or MgCl ₂ or FeCl ₂ , to increase the solubility of slaked lime from about 1.02% up to about 1.5%, ie up to 50% by the inert salt solution effect; Adding an inert salt to which a chloride of monovalent or divalent cationic metal is added in a ratio of hydrated lime: nasal correlates = 100: 10 to 50 parts by weight and stirred; (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) a step of adding the obtained slaked lime completely dissolved water to the raw water, which is quantified in the raw water.

According to another preferred aspect of the present invention for achieving the second object of the present invention described above, in addition to the first aspect described above, (d1) recrystallization filtration by a filter subsequent to the above step (d) Provided is a method for adding slaked lime further.

According to one preferred aspect of the present invention for achieving the third object of the present invention, in the water treatment method comprising the above-described mixing step, the flocculation step, the precipitation step, the filtration step, the above mixing step Provided is a method for treating purified water, characterized in that the slaked lime injected in is quantitatively injected according to the aspect for achieving the above-mentioned second object.

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

3 is a schematic view showing a slaked lime injecting device 1 according to a preferred embodiment of the present invention, and FIGS. 4 and 5 are each preferably used in the slaked lime injecting device 1 according to the present invention shown in FIG. A longitudinal cross-sectional view and a plan view showing a basic ice of the calcined lime input stirring tank 1a, which will be described first for the convenience of the description, with reference to the basic ice of the calcined lime input stirring tank 1a of FIGS. Except for the basic configuration, the configuration of the recrystallized filtration tank 1b is substantially the same.

As shown in the longitudinal cross-sectional view of FIG. 4, the basic ice of the slaked lime inlet stirring tank 1a is a partition wall that 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 is arbitrary and not limiting 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 part 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 part 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.

3, the slaked lime injecting device 1 according to one preferred embodiment of the present invention will be described.

In the illustrated example, the slaked lime injector 1 according to the present invention is composed of a slaked lime inlet stirring tank 1a and a recrystallized filtration tank 1b, but the recrystallized filtration tank 1b is optional in the present invention. The present invention may be composed of only the slaked lime input stirring tank (1a).

First, the slaked lime input stirring tank 1a will be described. The basic configuration includes a body 2 (cylindrical in the illustrated example, but the shape thereof is arbitrary in the present invention), and a hollow part. A partition wall 3 which bisects an area except the lower part of the body 2; 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; A primary filter 5 installed horizontally in an area defined by the inner periphery of the body 2 on the other side facing the water purification introduction pipe 7 and the partition wall 3, and the primary filter ( 5) It consists of the secondary filter 6 formed perpendicularly upwards.

The position of the primary filter 5 is any position of a compartment other than the compartment in which the purified water inlet pipe 7 is located among the two compartments (not shown) divided into two by the partition 3, Preferably, the filter is installed at about the middle portion or the lower portion thereof, and the primary filter 5 serves to prevent the sludge or slurry from moving due to the input of slaked lime, and may be various kinds of filters suitable for achieving this purpose. However, it may be preferable from the standpoint of durability and maintenance that the disc-shaped or box-shaped sieve type filter, in particular a metal sieve filter.

The position of the secondary filter 6 is above the primary filter 5 described above, and is preferably installed vertically slightly below the position of the purified water inlet tube 7. 6) is composed of a microfilter and / or nanofilter (nanofilter), these filters themselves are known and commercially available, so a detailed description thereof will be omitted.

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 by the operation of the float valve 7a from the purified water introduction pipe 7 is thoroughly stirred by the rotation of the impeller 4a, and then the primary filter 5 As a result, the slaked lime sludge or the slurry cannot be moved upward, and only the water in which the slaked lime is completely dissolved by the secondary filter 6 is discharged through the (primary) filter tube 171.

The shape of the (primary) filtration tube 171 may be preferable in view of filtration efficiency in that one end portion contacting the primary filter 6 has a large area and a cross-sectional area is reduced to the other end.

Next, the recrystallization filtration tank 1b will be described, the basic configuration of which is a body 2a (cylindrical in the illustrated example, but the shape thereof is optional in the present invention) and the lower part of the body 2a. A partition wall 3a that bisects an area except for; A primary filtration tube 171 communicating with an upper side of the body 2a; It consists of the secondary filter 6a of the inner periphery of the body 2a of the other side which opposes the said primary filtration tube 171.

If necessary, the recrystallization filtration tank 1b is also equipped with a stirring means composed of the reduction motor 181 as described above, the rotating shaft 4 extending therefrom, and an impeller 4a fixed to the lower end thereof ( Of course you can.

In the region defined by the inner periphery of the body 2a on the other side facing the primary filtration tube 171 and the partition 3a, the primary filter 5a is disposed below the secondary filter 6a. May be installed horizontally, but this is optional in the present invention.

On the other hand, the height of the secondary filter (6a) is slightly lower than the height of the primary filtration tube 171, it may be desirable to be located above the primary filter (5a).

A secondary filtration tube 172 communicates with the secondary filter 6a, and its shape is similar to that of the primary filtration tube 171, and one end of the secondary filtration tube 172 is a water tank ( 160).

Since the materials or materials of the primary filter 5a and the secondary filter 6a are the same as described above, redundant description thereof will be avoided.

Moreover, if necessary, the float valve 7b can be formed in the place where the said primary filtration pipe 171 communicates with.

The recrystallization filtration tank 1b described above is for filtering out the calcined lime fine particles, sludge or slurry due to recrystallization which may occur. The drain 9a may be provided at the lower portion thereof, and the recrystallization filtration tank 1b may be It may also be located on the base 182a as described above.

In the example shown, the slaked lime mixed water above the left side of the recrystallized filtration tank 1b can ensure the complete dissolution state of the slaked lime.

Next, a method for introducing slaked lime using the filter-applied slaked lime introducing apparatus 1 according to the present invention will be described, and the method according to the present invention includes the following steps.

(a) Step of stirring slaked lime mixed water: Purified water is added and slaked lime is added, followed by physical stirring.

(b) addition of inert salt: to increase the solubility of slaked lime from about 1.02% up to about 1.5% by an inert salt solution effect. = 100: 10-50 parts by weight of the addition and stirring.

Preferred examples of the above uncorrelated salts include sodium chloride or chlorides of monovalent or divalent cation metals such as MgCl ₂ , FeCl ₂ and the like.

(c) first filtration step:

The upstream flow removes sludge or slurry from slaked lime, etc. by the primary filter.

(d) secondary filtration steps:

Perform more precise filtration by secondary filter.

(e) Input stage to raw water:

The obtained slaked lime completely dissolved water is metered into the raw water.

In addition, the method for introducing slaked lime according to the present invention may further include the following steps following step (d).

(d1) recrystallization primary filtration step:

The recrystallized material by the primary filter through the upflow stream may be filtered subsequent to the secondary filtration step described above.

(d2) recrystallization secondary filtration step:

The recrystallization (secondary) filtration step may be performed following the recrystallization primary filtration step described above or subsequent to the above-described second filtration step.

Finally, when briefly referring to the purified water treatment method according to the present invention, including the slaked lime input method using the above-described filter applied slaked lime input device 1, slaked lime in raw water by the slaked lime input method according to the present invention as described above And flocculant and the like, followed by mixing and flocculation, followed by precipitation of the floc and filtration. The present invention as described above may be effectively applied in the chemical input chamber of the water purification plant, but is not limited thereto, and may be effectively applied as an auxiliary facility where a large-scale water purification treatment facility such as a high-rise building or an industrial complex is needed. Of course it is expected.

As described above, according to the filter-applied slaked lime input device, the slaked lime input method and the purified water treatment method using the same according to the present invention, it is possible to quantitative injection of slaked lime to maintain the proper alkalinity of the raw water, so that the efficiency and stability of coagulation and precipitation of raw water It is possible to effectively prevent the water drainage caused by the excessive injection of slaked lime, to prevent sludge increase and to settle the sedimentation basin and its downstream, and to maintain the proper alkalinity of purified water. Corrosion of metal pipes and concrete structures can be prevented, and the taste of tap water can be improved to the level of spring water.

While the present invention has been described in detail, it will be apparent to those skilled in the art that various changes and modifications can be made therein without departing from the scope of the invention, but are also within the scope of the invention. You must understand.

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 injecting 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 input stirring tank which can be preferably used in the slaked lime input device according to the present invention shown in FIG.

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

1: slaked lime input device according to the present invention

1a: slaked lime input stirring tank 1b: recrystallized filtration tank

2: body 3, 3a: bulkhead

4: axis of rotation 4a: impeller

5,5a: 1st filter 6,6a: 2nd filter

7: Water purification introduction pipe 7a, 7b: 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 unit

110: first thickener 111: second thickener

120: sludge reservoir 130: dehydrator

160: hydrated water collection tank 171: primary filtration tube

172: secondary filtration tube 181: reduction motor

182,182a: base

Claims (12)

A body;       A partition wall bisecting 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 inlet pipe communicating with an upper side of the body and equipped with a float valve; Consists of a slaked lime inlet and agitator tank including a primary filter installed in the area defined by the inner circumferential edge of the other body facing the purified water inlet pipe and a secondary filter formed above the primary filter. Become; The primary filter is a lime filter or a sieve filter for slurry filtration, and the secondary filter is a microfilter, a nanofilter, or a microfilter and a nanofilter.       A filter-applied slaked lime injection device, wherein the height of the secondary filter is located lower than the height of the purified water inlet pipe. A partition wall which bisects the body, and an area excluding the lower part of the body; A reduction motor installed above the body and 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, A slaked lime inlet stirring tank including a primary filter installed in an area defined by the inner circumferential edge of the other body facing the purified water introduction pipe and the partition wall, and a secondary filter formed above the primary filter; A partition wall which bisects the body and an area excluding the lower part of the body, It consists of a recrystallization filtration tank comprising a filter formed on the inner periphery of the body: The heights of the above-described purified water introduction pipe, the secondary filter of the slaked lime input stirring tank, and the secondary filter of the recrystallization filtration tank are gradually lowered, A primary filtration tube is formed between the secondary filter of the slaked lime input stirring tank and the recrystallization filtration tank, and a secondary filtration tube is formed on the filter of the recrystallization filtration tank. Filter applied slaked lime dosing device. The filter of claim 2, wherein the filter of the recrystallization filtration tank is a secondary filter, and the primary filter is further provided in an area defined by the inner circumference of the body opposite to the primary filtration tube and the partition wall. Filter applied slaked lime dosing device. The method according to claim 2, wherein the primary filter is a lime filter or a sieve filter for slurry filtration, and the secondary filter is a microfilter, a nanofilter, or a microfilter and a nanofilter. Filter applied slaked lime dosing device. The apparatus according to claim 2, wherein a float valve is attached to each of the purified water introduction pipe and the primary filtration pipe, and a drain is disposed below the slaked lime input stirring tank and the recrystallized filtration tank. 3. The filter applied slaked lime feeding device according to claim 2, further comprising a reduction shaft installed above the body of the recrystallization filtration tank, a rotating shaft extending downward therefrom, and an impeller fixed to the lower end of the rotating shaft. The filter applied slaked lime feeding device according to claim 1 or 2, wherein a storage tank for storing completely dissolved slaked lime is provided at one end of the primary or secondary filtration pipes. Slaked lime dosing method comprising the following steps: (a) a step of stirring slaked lime mixed water to introduce purified water and add slaked lime, followed by physical stirring; (b) To increase the solubility of hydrated lime by 50% from 1.02% to 1.5% by the inert salt solution effect, add hydrated lime: noncoronal salt at a ratio of 100: 10 to 50 parts by weight and stir. Adding an inert salt; (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. 9. The method of claim 8, further comprising (d1) further performing a recrystallization filtration step by filter through an upflow stream following step (d). 10. The recrystallized material according to claim 9, wherein the recrystallization filtration step of step (d1) is followed by (d1-1) recrystallization of the recrystallized material by a primary filter through an upstream stream following the above-described secondary filtration step. A slaked lime injection method comprising a secondary filtration step and (d1-2) a secondary filtration step of recrystallized by a secondary filter. 10. The method according to any one of claims 8 to 9, wherein the uncorrelated salt is a chloride of a monovalent or divalent cation metal such as sodium chloride or MgCl ₂ , or FeCl _2, and the primary filter is hydrated lime sludge. (B) a method of adding lime, wherein the secondary filter is a microfilter, a nanofilter, or a microfilter and a nanofilter. In the water treatment method comprising a mixing step, a flocculation step, a precipitation step, and a filtration step, The hydrated lime injected in the mixing step is quantitatively added by the hydrated lime feeding method according to any one of claims 8 to 10 described above.