KR101088148B1 - Electrical neutralization of colloidal particles with speed control how water - Google Patents

Abstract

PURPOSE: A water treating method using the electric neutralizing speed adjustment of colloidal particles is provided to improve the efficiency of a wastewater treating process by preparing conditions for the chemical bond reaction of metal ions with respect to phosphorus, nitrogen, and suspended solids. CONSTITUTION: A coagulant is introduced into wastewater contained in a coagulation reactor. The introducing amount of the coagulant with respect to the wastewater is between 5 and 120 mg/l. A slow mixing process is primarily implemented at 20-80 rpm for 5 to 30 minutes. A rapid mixing process is secondarily implemented at 90-220 rpm for 30 to 90 seconds. A precipitating process and a filtering process are followed. The coagulant is one or the combination of a group including aluminum-based, iron-based, calcium-based, magnesium-based, rear earth metal-based compounds, and the compound of a rear earth metal and an aluminum salt.

Description

Electrical neutralization of colloidal particles with speed control how water}

The present invention relates to a method for treating wastewater, and more particularly, a metal or non-metal salt is added to raw water of sewage or wastewater or purified water by mixing and then mixed to hydrolyze the colloidal particles while the coagulant is hydrolyzed ( Control the electrical neutralization rate of the colloidal particles to provide more efficient water treatment by providing the temporal and physical conditions under which metal ion materials can chemically react with phosphorus, nitrogen, COD, BOD and SS. It relates to a water treatment method using.

It is well known that there is a lack of awareness of environmental conservation in the course of rapid economic development. Due to this lack of awareness of environmental conservation, the level of pollution as well as air quality has reached a very serious level. In particular, domestic sewage, agricultural and livestock waste, and industrial wastewater cause pollution of public waters such as appeals, inner bays and inland seas, and urban small and medium rivers.

In recent years, due to rapid industrial development, population growth, and urban population concentration, the amount of inorganic and organic components in the wastewater is gradually increasing along with the increase of various water volumes. These wastewaters contain high concentrations of organic substances such as phosphorus, nitrogen, chemical oxygen demand (COD), biochemical oxygen demand (BOD), and SS (suspension material), and if they flow directly into rivers, lakes, dams, etc. This, of course, leads to the destruction of the ecosystem due to toxicity and adversely affects the environment. Therefore, the wastewater is set to a predetermined standard, and is purified to drain below a predetermined standard value.

Phosphorus, nitrogen, and fluorine, which are distributed in the wastewater as described above, are not easily removed by dispersing particles due to general flocculation (ie, sweet flocculation). Provide adequate time for the substance to chemically react with phosphorus or contaminants to become insoluble.

In the wastewater treatment as described above, the wastewater is treated using chemical treatment, electrical treatment, filtration, membrane method, and the like. Proof of such wastewater treatment method The most representative treatment method is coagulant in chemical treatment, and using inorganic or organic coagulant to change the surface properties of particles to form floc and then to precipitate. By far the most common method is known.

Meanwhile, the aluminum flocculant, which is well known to date, is injected into the wastewater, and thus the electrical reaction rate is very fast. Therefore, the contaminants cannot be removed by chemical bonding, but most of them are removed by Sweet Floc. In this case, the insoluble matter can be removed by coprecipitation with SS or the like in the form of floc, but it does not remove those present in the waste water as soluble substances.

The above-mentioned soluble materials have to be brought into contact with chemically reactive metals for a suitable time, which is impossible physically, physically, economically and environmentally. In other words, although there are various types of contaminants in the wastewater, the wastewater can be largely divided into colloidal particles and particles below. Some wastewaters contain many insoluble particles, and some wastewaters contain many dissolved particles.

On the other hand, the flocculation mixing technique according to the prior art concentrates on maximizing the electric neutralization ability by contacting the cation (+) of the flocculant with the anion (-) SS particles in the shortest time after the flocculant is added and stirred rapidly. The low speed agitation is focused on stably removing the precipitate by forming large particles formed by rapid mixing.

However, there is a problem in that any waste water as described above is not merely flocculation by electric neutralization, and the pollutants cannot be removed only by chemical bonding reaction.

The present invention has been made to solve all the problems of the prior art, by selecting the appropriate flocculant step by step slow mixing and rapid mixing of the flocculant and the waste water step by step to the material of the metal ion, phosphorus, nitrogen, COD, BOD and It is an object of the present invention to provide a water treatment method using an electrical neutralization rate control of colloidal particles to provide a more efficient water treatment by providing a time and physical conditions capable of chemically bonding reactions such as SS.

In addition, another object of the technology according to the present invention is to select a suitable flocculant and to perform slow and rapid blending step by step when mixing the flocculant and wastewater step by step chemical bonding reaction of the metal ions such as phosphorus, nitrogen, COD, BOD and SS The purpose is to improve the removal efficiency of phosphorus, nitrogen, COD, BOD and SS by providing a time and physical conditions that can be.

The present invention configured to achieve the above object is as follows. That is, the water treatment method using the electrical neutralization rate control of the colloidal particles according to the present invention is a colloid in the process of treating the waste water, such as water, sewage, industrial wastewater, lake water, process water and water treatment process water with a chemical treatment method using a flocculant In the method of treating wastewater containing particulate matter and less particulate matter, a flocculant is introduced at an amount of 5 to 120 mg / l into the wastewater on the flocculation tank, so that 20 to 80 RPM is primarily used when the wastewater and the flocculant are mixed. After the slow stirring for 5 to 30 minutes at a stirring speed of, and then proceeds to a rapid stirring for 30 to 90 seconds at a stirring speed of 90 to 220 RPM in the second configuration or consists of a water treatment.

In the constitution according to the present invention as described above, the flocculant added to the flocculation tank may be a flocculant or any one of flocculants including aluminum salts, iron salts, calcium, magnesium, rare earth metals, and compounds of rare earth metals and aluminum salts. The above coagulant is mixed, but may be mixed in the same ratio when two or more coagulants are mixed.

On the other hand, the aluminum salt-based flocculant in the configuration as described above, polyhydric aluminum chloride (Polyaluminum Chloro Sulfate: PAHCS), polyhydric acid hydrochloride Chloro Sulfate Silicate (PAHCSS), poly aluminum chloride (Polyaluminum Chloride: PAC), Poly Aluminum Chloride Silicate (PACS), Poly Sulfate Silicate (PASS), Aluminum Sulfate (AS) and Aluminum Chloride (Aluminum Chloride: AC) It may consist of one or more selected from among flocculants or a flocculant containing an organic polymer compound in these flocculants.

In addition, the iron salt-based flocculant in the composition according to the present invention is iron sulfate (Ferric Sulfate: FS), iron polysulfate (Poly-Ferric Sulfate: PFS), iron chloride (Ferric Chloride: FC), poly-iron chloride (Poly-Ferric Chloride: PFC), at least one coagulant selected from the group consisting of Ferric Aluminum (FA) and Polyaluminum Iron Chloro Sulfate (PAICS) or at least one coagulant containing an organic polymer compound in these coagulants. Can be made.

In addition, the calcium-based flocculant in the configuration according to the present invention may be made of calcium (Ca) or polyaluminum calcium chloride (Polyaluminum Calcium Chloro Silicate: PACCS).

In addition, the magnesium-based flocculant in the configuration according to the present invention may be made of magnesium (Mg) or magnesium sulfate (Magnesium Sulfate: MgSO ₄ ).

In addition, the technique according to the present invention can be made in a configuration that proceeds slow stirring for 5 to 30 minutes at a stirring speed of 10 to 20 RPM in the third after the second rapid stirring in addition to the configuration as described above.

According to the technique of the present invention, by selecting a suitable flocculant, the slow mixing and the rapid mixing of the flocculant and the wastewater are carried out step by step so that the metal ion substance can react chemically with phosphorus, nitrogen, COD, BOD and SS. By providing physical conditions, more efficient water treatment can be achieved.

In addition, the technology according to the present invention by selecting the appropriate flocculant can be subjected to the step of slow mixing and rapid mixing of the flocculant and the waste water step by step to chemically react the metal ion material with phosphorus, nitrogen, COD, BOD and SS, etc. The removal efficiency can be further improved by providing time and physical conditions.

Hereinafter, with reference to the accompanying drawings will be described in detail a preferred embodiment of the water treatment method using the electrical neutralization rate control of the colloidal particles according to the present invention.

First, the colloidal particles will be described before explaining the technique according to the present invention. The typical size of particulate matter that does not easily settle during water treatment or sewage and wastewater treatment is a colloidal material, and the colloidal dispersion dispersed in dorc is a dispersed phase that is a colloidal particle and a dispersion medium that is a medium dispersing it. Medium is classified as follows.

Dispersoid Dispersion designation Liquid solid Sol, Suspension Liquid Liquid Emulsion Liquid gas Foam

The colloid as described above is a colloidal state in which fine particles having a diameter larger than ordinary molecules or ions and having a diameter of about 1 to 100 nm do not aggregate or precipitate in a gas or a liquid and are in a colloidal state. Is called a colloid. At this time, the colloidal solution is stably present because colloidal particles carry the same kind of electricity and repel each other.

On the other hand, colloidal particles as described above have a negative (-) charge and the same kind of particles repel each other, but when a coagulant of positive (+) metal component flows from the outside, a neutral reaction occurs on the surface to generate mutual force of force pulling the particles together. The growth of the particles is induced to cause the floc to grow. As the floc grows, it settles down and accumulates as sludge.

The water treatment method using the control of the neutralization rate of the colloidal particles according to the present invention relates to a technique for more efficient water treatment by controlling the electrical neutralization rate of the colloidal particles by controlling the stirring speed in the flocculation reaction tank, In the water treatment method according to the present invention, a small amount of wastewater is added to the wastewater in the flocculation tank, and the slow stirring is carried out firstly when the wastewater and the flocculant are mixed, and then the rapid stirring is carried out secondly, and the mixture is allowed to stand for 5 to 60 minutes after the second rapid stirring. Consists of

In the configuration according to the present invention as described above, the first slow stirring process when the waste water and the flocculant is mixed is a process of chemically combining the dissolved pollutants and metal ions, the first slow stirring process is 20 to 80 RPM Slowly stir for 5 to 30 minutes under the stirring speed of so that dissolved substances and metal ions present in the waste water are chemically separated to grow (mature) into microflocs.

In the configuration according to the present invention as described above, the second rapid stirring process during mixing of the wastewater and the flocculant is to help the formation of flocs by completing the electrical neutralization between the metal ions and the particles and promoting the collision between the particles. In this second rapid stirring process, the flocculant added in water is completely mixed (diluted). At this time, the second rapid stirring process is rapid stirring for 30 to 90 seconds under a stirring speed of 90 to 220 RPM.

As described above, when the wastewater and the flocculant are mixed, the slow agitation is first performed for 5 to 30 minutes at a stirring speed of 20 to 80 RPM, followed by a rapid stirring for 30 to 90 seconds at a stirring speed of 90 to 220 RPM. By controlling the rate (time) of colliding particles to electrically neutralize colloidal particles as the coagulant is hydrolyzed by proceeding coagulation, the temporal and physical properties of the metal ion substance can be chemically combined with phosphorus, nitrogen, COD, BOD and SS. More efficient water treatment is provided by providing conditions.

On the other hand, in the technique according to the present invention as described above, the amount of flocculant added to the wastewater on the flocculation tank is added in the range of 5 to 120 mg / l. That is, the injection is carried out at a dose of 5 to 120 mg of flocculant per liter of wastewater. At this time, the flocculant introduced into the wastewater on the flocculation tank is composed of a coagulant or a coagulant of any one of a coagulant made of aluminum salts, iron salts, calcium, magnesium, rare earth metals and rare earth metals and aluminum salts. Is done. At this time, when two or more kinds of flocculants are mixed, they are mixed in the same ratio.

In the above-described configuration, the aluminum salt-based flocculant may be polyaluminum hydrochloride chlorosulfate (PAHCS), polyhydric acid hydrochloride chlorosulfate (PAHCSS), polyaluminum chloride (PAC) At least one member selected from the group consisting of: polyaluminum chloride (PACS), polyaluminum sulfate silicate (PASS), aluminum sulfate (AS), and aluminum chloride (AC) It consists of at least 1 sort (s) selected from the flocculant or the flocculant which the organic polymer compound contained in these flocculants.

In addition, the iron salt-based flocculant in the composition according to the present invention as described above, such as iron sulfate (Ferric Sulfate: FS), iron polysulfate (Poly-Ferric Sulfate: PFS), iron chloride (Ferric Chloride: FC), poly iron chloride (Poly -At least one flocculant selected from the group consisting of Ferric Chloride (PFC), Ferric Aluminum (FA) and Polyaluminum Iron Chloro Sulfate (PAICS), or a flocculant containing an organic polymer compound in these flocculants At least one flocculant selected.

In the composition according to the present invention, the calcium-based coagulant is composed of calcium (Ca) or polyaluminum chloride (PACCS), and the magnesium-based coagulant is magnesium (Mg) or magnesium sulfate (Magnesium Sulfate). : MgSO ₄ ).

In addition, the technique according to the present invention is introduced into the waste water on the flocculation tank in the amount of 5 to 120 mg / L as described above, when mixing the waste water and the flocculant first 5 to 30 minutes at a stirring speed of 20 to 80 RPM After the slow agitation, the slow agitation for 30 to 90 seconds at a stirring speed of 90 to 220 RPM in addition to the configuration of the coagulation treatment in addition to the slow agitation can proceed to the third slow agitation. At this time, the third slow stirring may be a slow stirring for 5 to 30 minutes under a stirring speed of 10 to 20 RPM.

After the first slow agitation and the second rapid agitation as described above, the third slow agitation may cause the colloidal particles that are not agglomerated through the first slow agitation and the second rapid agitation to grow into flocs. To help.

On the other hand, the first slow stirring to stir for 5 to 30 minutes at the stirring speed of 20 to 80 RPM and the second rapid stirring to stir for 30 to 90 seconds at the stirring speed of 90 to 220 RPM as described above On the flocculation reactor. In addition, the third slow stirring that is stirred for 5 to 30 minutes under a stirring speed of 10 to 20 RPM is also performed on an agglomeration reaction tank in which the first slow stirring and the second rapid stirring are performed.

In addition, the present invention can also be applied to the mechanical mixing method of the same ability as the stirrer to stir through the rotation of the stirring blade when mixing the flocculant into the waste water as in the technique according to the present invention. That is, the mechanical mixing method of agitation capability as described above includes a mixing method by collision, a mixing method by a fluid, a mixing method by air, a mixing method by a free fall, and a mixing method through a line (euro pipe). .

In addition, the present invention can be applied to a combination of the mechanical mixing method and the physical mixing method as described above. That is, a method of combining a mechanical mixing method and a physical mixing method includes a mixing method by a first flowing fluid and a mixing method by a secondary mechanical mixing method or a mixing method by a primary mechanical mixing method and a secondary fluid.

[Example]

In order to determine the TP removal rate according to the water treatment admixture conditions according to the present invention, the following experiment was performed. In this case, PAHCS, PAC 17%, Alum 7%, FeSO ₄ and FeCl ₃ were used as flocculants.

On the other hand, in the present embodiment, the experiment including the conditions outside the scope of the technology according to the present invention in order to compare with the conditions according to the present invention.

Experimental Example 1

Experiments according to the order and intensity of slow and rapid mixing

1. First experiment

The properties of the raw water are as shown in Table 2, and the experimental conditions are as shown in Table 3. Results according to the experimental conditions are shown in Tables 4 to 7.

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Number Temperature
(℃) pH Turbidity
(NTU) alkalinity (mg / ℓ) SS
(Mg / l) TP
(Mg / l) 24.3 7.10 8.09 92.5 2.41 0.542

Jar-test condition Condition 1 Stirring speed Stirring time Stirring speed Stirring time Identity 50 rpm 10 min 200 rpm 1 min 20 min Condition 2 Stirring speed Stirring time Stirring speed Stirring time Identity 100 rpm 10 min 200 rpm 1 min 20 min Condition 3 Stirring speed Stirring time Stirring speed Stirring time Identity 200 rpm 1 min 50 rpm 10 min 20 min Condition 4 Stirring speed Stirring time Stirring speed Stirring time Identity 200 rpm 5 min - - 20 min

end. Experimental condition 1

PAHCS PAC 17% Alum 7% FeSO ₄ FeCl ₃ Input amount (mg / ℓ) 12 12 12 12 12 T-P (mg / l) 0.136 0.167 0.377 0.324 0.286 Removal rate (%) 74.9 69.2 30.4 40.2 47.2

I. Experimental Condition 2

PAHCS PAC 17% Alum 7% FeSO ₄ FeCl ₃ Input amount (mg / ℓ) 12 12 12 12 12 T-P (mg / l) 0.192 0.203 0.396 0.351 0.302 Removal rate (%) 64.5 62.5 26.9 35.2 44.3

All. Experimental Condition 3

PAHCS PAC 17% Alum 7% FeSO ₄ FeCl ₃ Input amount (mg / ℓ) 12 12 12 12 12 T-P (mg / l) 0.186 0.197 0.385 0.337 0.294 Removal rate (%) 65.7 63.7 29.0 37.8 45.8

la. Experimental Condition 4

PAHCS PAC 17% Alum 7% FeSO ₄ FeCl ₃ Input amount (mg / ℓ) 12 12 12 12 12 T-P (mg / l) 0.180 0.191 0.381 0.329 0.292 Removal rate (%) 66.8 64.8 29.7 39.3 46.1

2. Second experiment

The properties of the raw water are as shown in Table 8, and the experimental conditions are as shown in Table 9. Results according to the experimental conditions are shown in Tables 10 to 13.

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Number Temperature
(℃) pH Turbidity
(NTU) alkalinity (mg / ℓ) SS
(Mg / l) TP
(Mg / l) 24.5 6.98 6.90 93 2.63 0.368

Jar-test condition Condition 1 Stirring speed Stirring time Stirring speed Stirring time Identity 50 rpm 10 min 200 rpm 1 min 20 min Condition 2 Stirring speed Stirring time Stirring speed Stirring time Identity 100 rpm 10 min 200 rpm 1 min 20 min Condition 3 Stirring speed Stirring time Stirring speed Stirring time Identity 200 rpm 1 min 50 rpm 10 min 20 min Condition 4 Stirring speed Stirring time Stirring speed Stirring time Identity 200 rpm 5 min - - 20 min

end. Experimental condition 1

PAHCS PAC 17% Alum 7% FeSO ₄ FeCl ₃ Input amount (mg / ℓ) 12 12 12 12 12 T-P (mg / l) 0.178 0.182 0.284 0.253 0.204 Removal rate (%) 51.6 50.5 22.8 31.3 44.6

I. Experimental Condition 2

PAHCS PAC 17% Alum 7% FeSO ₄ FeCl ₃ Input amount (mg / ℓ) 12 12 12 12 12 T-P (mg / l) 0.187 0.190 0.288 0.261 0.224 Removal rate (%) 49.2 48.4 21.7 29.1 39.1

All. Experimental Condition 3

PAHCS PAC 17% Alum 7% FeSO ₄ FeCl ₃ Input amount (mg / ℓ) 12 12 12 12 12 T-P (mg / l) 0.191 0.203 0.296 0.268 0.226 Removal rate (%) 48.1 44.8 19.6 27.2 38.6

la. Experimental Condition 4

PAHCS PAC 17% Alum 7% FeSO ₄ FeCl ₃ Input amount (mg / ℓ) 12 12 12 12 12 T-P (mg / l) 0.205 0.207 0.301 0.273 0.231 Removal rate (%) 44.3 43.8 18.2 25.8 37.2

3. 3rd experiment

The properties of the raw water are as shown in Table 14, and the experimental conditions are as shown in Table 15. Results according to the experimental conditions are shown in Tables 16 to 19.

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Number Temperature
(℃) pH Turbidity
(NTU) alkalinity (mg / ℓ) SS
(Mg / l) TP
(Mg / l) 23.6 7.08 7.45 93.5 2.74 0.845

Jar-test condition Condition 1 Stirring speed Stirring time Stirring speed Stirring time Identity 50 rpm 10 min 200 rpm 1 min 20 min Condition 2 Stirring speed Stirring time Stirring speed Stirring time Identity 100 rpm 10 min 200 rpm 1 min 20 min Condition 3 Stirring speed Stirring time Stirring speed Stirring time Identity 200 rpm 1 min 50 rpm 10 min 20 min Condition 4 Stirring speed Stirring time Stirring speed Stirring time Identity 200 rpm 5 min - - 20 min

end. Experimental condition 1

PAHCS PAC 17% Alum 7% FeSO ₄ FeCl ₃ Input amount (mg / ℓ) 12 12 12 12 12 T-P (mg / l) 0.170 0.185 0.482 0.406 0.361 Removal rate (%) 79.9 78.1 43.0 52.0 57.3

I. Experimental Condition 2

PAHCS PAC 17% Alum 7% FeSO ₄ FeCl ₃ Input amount (mg / ℓ) 12 12 12 12 12 T-P (mg / l) 0.320 0.338 0.597 0.432 0.391 Removal rate (%) 62.1 60.0 29.3 48.9 53.7

All. Experimental Condition 3

PAHCS PAC 17% Alum 7% FeSO ₄ FeCl ₃ Input amount (mg / ℓ) 12 12 12 12 12 T-P (mg / l) 0.255 0.274 0.566 0.420 0.383 Removal rate (%) 69.8 67.6 33.0 50.3 54.7

la. Experimental Condition 4

PAHCS PAC 17% Alum 7% FeSO ₄ FeCl ₃ Input amount (mg / ℓ) 12 12 12 12 12 T-P (mg / l) 0.202 0.237 0.513 0.418 0.376 Removal rate (%) 76.1 72.0 39.3 50.5 55.5

4. Fourth Experiment

The properties of the raw water are as shown in Table 20, and the experimental conditions are as shown in Table 21. Results according to the experimental conditions are shown in Tables 22 to 25.

won
Number Temperature
(℃) pH Turbidity
(NTU) alkalinity (mg / ℓ) SS
(Mg / l) TP
(Mg / l) 24.4 6.88 6.52 91 2.56 1.291

Jar-test condition Condition 1 Stirring speed Stirring time Stirring speed Stirring time Identity 50 rpm 10 min 200 rpm 1 min 20 min Condition 2 Stirring speed Stirring time Stirring speed Stirring time Identity 100 rpm 10 min 200 rpm 1 min 20 min Condition 3 Stirring speed Stirring time Stirring speed Stirring time Identity 200 rpm 1 min 50 rpm 10 min 20 min Condition 4 Stirring speed Stirring time Stirring speed Stirring time Identity 200 rpm 5 min - - 20 min

end. Experimental condition 1

PAHCS PAC 17% Alum 7% FeSO ₄ FeCl ₃ Input amount (mg / ℓ) 12 12 12 12 12 T-P (mg / l) 0.280 0.291 0.826 0.777 0.702 Removal rate (%) 78.3 77.5 36.0 38.8 45.6

I. Experimental Condition 2

PAHCS PAC 17% Alum 7% FeSO ₄ FeCl ₃ Input amount (mg / ℓ) 12 12 12 12 12 T-P (mg / l) 0.359 0.366 0.881 0.805 0.723 Removal rate (%) 72.2 71.6 31.8 37.6 44.0

All. Experimental Condition 3

PAHCS PAC 17% Alum 7% FeSO ₄ FeCl ₃ Input amount (mg / ℓ) 12 12 12 12 12 T-P (mg / l) 0.371 0.368 0.893 0.807 0.736 Removal rate (%) 71.3 71.5 30.8 37.5 43.0

la. Experimental Condition 4

PAHCS PAC 17% Alum 7% FeSO ₄ FeCl ₃ Input amount (mg / ℓ) 12 12 12 12 12 T-P (mg / l) 0.417 0.426 0.913 0.836 0.769 Removal rate (%) 67.7 67.0 29.3 35.2 40.4

As shown in the results of the first to fourth tests of the slow mixing, rapid mixing, and rapid mixing of Experimental Example 1 described above, the result of Condition 1 satisfying the range of the present invention was the best in terms of TP removal rate. It can be seen that.

Experimental Example 2

Experiment with slow mixing reaction time

1. Testing according to the stirring time when slow mixing at 20 rpm

The properties of the raw water are as shown in Table 26, and the experimental conditions are as shown in Table 27. Results according to the experimental conditions are shown in Tables 28 to 31.

won
Number Temperature
(℃) pH Turbidity
(NTU) alkalinity (mg / ℓ) SS
(Mg / l) TP
(Mg / l) 19.8 6.82 7.15 88 2.76 1.440

Jar-test condition Condition 1 Stirring speed Stirring time Stirring speed Stirring time Identity 20 rpm 5 min 200 rpm 1 min 20 min Condition 2 Stirring speed Stirring time Stirring speed Stirring time Identity 20 rpm 10 min 200 rpm 1 min 20 min Condition 3 Stirring speed Stirring time Stirring speed Stirring time Identity 20 rpm 20 min 200 rpm 1 min 20 min Condition 4 Stirring speed Stirring time Stirring speed Stirring time Identity 20 rpm 30 min 200 rpm 1 min 20 min

end. Experimental condition 1

PAHCS PAC 17% Alum 7% FeSO ₄ FeCl ₃ Input amount (mg / ℓ) 20 20 20 20 20 T-P (mg / l) 0.522 0.613 1.027 0.953 0.814 Removal rate (%) 63.8 57.4 28.7 33.8 43.5

I. Experimental Condition 2

PAHCS PAC 17% Alum 7% FeSO ₄ FeCl ₃ Input amount (mg / ℓ) 20 20 20 20 20 T-P (mg / l) 0.422 0.596 1.003 0.907 0.749 Removal rate (%) 70.7 58.6 30.3 37.0 48.0

All. Experimental Condition 3

PAHCS PAC 17% Alum 7% FeSO ₄ FeCl ₃ Input amount (mg / ℓ) 20 20 20 20 20 T-P (mg / l) 0.615 0.663 1.135 1.011 0.825 Removal rate (%) 57.3 54.0 21.2 29.8 42.7

la. Experimental Condition 4

PAHCS PAC 17% Alum 7% FeSO ₄ FeCl ₃ Input amount (mg / ℓ) 20 20 20 20 20 T-P (mg / l) 0.638 0.670 1.144 1.022 0.838 Removal rate (%) 55.7 53.5 20.6 29.0 41.8

2. Test according to the stirring time when slow mixing is 30 rpm

The properties of the raw water are as shown in Table 32, and the experimental conditions are as shown in Table 33. Results according to the experimental conditions are shown in Table 34 to Table 37.

won
Number Temperature
(℃) pH Turbidity
(NTU) alkalinity (mg / ℓ) SS
(Mg / l) TP
(Mg / l) 18.8 6.86 7.52 90 2.52 1.723

Jar-test condition Condition 1 Stirring speed Stirring time Stirring speed Stirring time Identity 30 rpm 5 min 200 rpm 1 min 20 min Condition 2 Stirring speed Stirring time Stirring speed Stirring time Identity 30 rpm 10 min 200 rpm 1 min 20 min Condition 3 Stirring speed Stirring time Stirring speed Stirring time Identity 30 rpm 20 min 200 rpm 1 min 20 min Condition 4 Stirring speed Stirring time Stirring speed Stirring time Identity 30 rpm 30 min 200 rpm 1 min 20 min

end. Experimental condition 1

PAHCS PAC 17% Alum 7% FeSO ₄ FeCl ₃ Input amount (mg / ℓ) 20 20 20 20 20 T-P (mg / l) 0.608 0.711 1.333 1.115 0.953 Removal rate (%) 64.7 58.7 22.6 35.3 44.7

I. Experimental Condition 2

PAHCS PAC 17% Alum 7% FeSO ₄ FeCl ₃ Input amount (mg / ℓ) 20 20 20 20 20 T-P (mg / l) 0.531 0.686 1.238 1.107 0.902 Removal rate (%) 69.2 60.2 28.1 35.8 47.6

All. Experimental Condition 3

PAHCS PAC 17% Alum 7% FeSO ₄ FeCl ₃ Input amount (mg / ℓ) 20 20 20 20 20 T-P (mg / l) 0.730 0.817 1.526 1.243 0.989 Removal rate (%) 57.6 52.6 11.4 27.9 42.6

la. Experimental Condition 4

PAHCS PAC 17% Alum 7% FeSO ₄ FeCl ₃ Input amount (mg / ℓ) 20 20 20 20 20 T-P (mg / l) 0.887 0.904 1.534 1.332 0.998 Removal rate (%) 48.5 47.5 11.0 22.7 42.1

3. Test according to the stirring time when slow mixing at 40 rpm

The properties of the raw water are as shown in Table 38 and the experimental conditions are as shown in Table 39. The results according to the experimental conditions are shown in Tables 40 to 43.

won
Number Temperature
(℃) pH Turbidity
(NTU) alkalinity (mg / ℓ) SS
(Mg / l) TP
(Mg / l) 18.8 6.61 7.04 86 2.66 2.083

Jar-test condition Condition 1 Stirring speed Stirring time Stirring speed Stirring time Identity 40 rpm 5 min 200 rpm 1 min 20 min Condition 2 Stirring speed Stirring time Stirring speed Stirring time Identity 40 rpm 10 min 200 rpm 1 min 20 min Condition 3 Stirring speed Stirring time Stirring speed Stirring time Identity 40 rpm 20 min 200 rpm 1 min 20 min Condition 4 Stirring speed Stirring time Stirring speed Stirring time Identity 40 rpm 30 min 200 rpm 1 min 20 min

end. Experimental condition 1

PAHCS PAC 17% Alum 7% FeSO ₄ FeCl ₃ Input amount (mg / ℓ) 20 20 20 20 20 T-P (mg / l) 0.552 0.601 1.571 1.098 0.914 Removal rate (%) 73.5 71.1 24.6 47.3 56.1

I. Experimental Condition 2

PAHCS PAC 17% Alum 7% FeSO ₄ FeCl ₃ Input amount (mg / ℓ) 20 20 20 20 20 T-P (mg / l) 0.451 0.507 1.550 1.091 0.883 Removal rate (%) 78.3 75.7 25.6 47.6 57.6

All. Experimental Condition 3

PAHCS PAC 17% Alum 7% FeSO ₄ FeCl ₃ Input amount (mg / ℓ) 20 20 20 20 20 T-P (mg / l) 0.579 0.624 1.578 1.114 0.958 Removal rate (%) 72.2 70.0 24.2 46.5 54.0

la. Experimental Condition 4

PAHCS PAC 17% Alum 7% FeSO ₄ FeCl ₃ Input amount (mg / ℓ) 20 20 20 20 20 T-P (mg / l) 0.657 0.701 1.614 1.211 1.008 Removal rate (%) 68.5 66.3 22.5 41.9 51.6

4. Slow mixing 50 rpm test according to the stirring time

The properties of the raw water are as shown in Table 44, and the experimental conditions are as shown in Table 45. Results according to the experimental conditions are shown in Tables 46 to 49.

won
Number Temperature
(℃) pH Turbidity
(NTU) alkalinity (mg / ℓ) SS
(Mg / l) TP
(Mg / l) 18.9 6.96 7.05 90 2.77 1.202

Jar-test condition Condition 1 Stirring speed Stirring time Stirring speed Stirring time Identity 50 rpm 5 min 200 rpm 1 min 20 min Condition 2 Stirring speed Stirring time Stirring speed Stirring time Identity 50 rpm 10 min 200 rpm 1 min 20 min Condition 3 Stirring speed Stirring time Stirring speed Stirring time Identity 50 rpm 20 min 200 rpm 1 min 20 min Condition 4 Stirring speed Stirring time Stirring speed Stirring time Identity 50 rpm 30 min 200 rpm 1 min 20 min

end. Experimental condition 1

PAHCS PAC 17% Alum 7% FeSO ₄ FeCl ₃ Input amount (mg / ℓ) 20 20 20 20 20 T-P (mg / l) 0.537 0.593 0.974 0.888 0.797 Removal rate (%) 55.3 50.7 19.0 26.1 33.7

I. Experimental Condition 2

PAHCS PAC 17% Alum 7% FeSO ₄ FeCl ₃ Input amount (mg / ℓ) 20 20 20 20 20 T-P (mg / l) 0.502 0.534 0.837 0.796 0.712 Removal rate (%) 58.2 55.6 30.4 33.8 40.8

All. Experimental Condition 3

PAHCS PAC 17% Alum 7% FeSO ₄ FeCl ₃ Input amount (mg / ℓ) 20 20 20 20 20 T-P (mg / l) 0.588 0.617 0.998 0.897 0.814 Removal rate (%) 51.1 48.7 17.0 25.4 32.3

la. Experimental Condition 4

PAHCS PAC 17% Alum 7% FeSO ₄ FeCl ₃ Input amount (mg / ℓ) 20 20 20 20 20 T-P (mg / l) 0.601 0.634 0.999 0.902 0.827 Removal rate (%) 50.0 47.3 16.9 25.0 31.2

5. Test according to the stirring time when slow mixing at 60 rpm

The properties of the raw water are as shown in Table 50, and the experimental conditions are as shown in Table 51. Results according to the experimental conditions are shown in Tables 52 to 55.

won
Number Temperature
(℃) pH Turbidity
(NTU) alkalinity (mg / ℓ) SS
(Mg / l) TP
(Mg / l) 18.5 6.66 7.24 88 2.76 1.949

Jar-test condition Condition 1 Stirring speed Stirring time Stirring speed Stirring time Identity 60 rpm 5 min 200 rpm 1 min 20 min Condition 2 Stirring speed Stirring time Stirring speed Stirring time Identity 60 rpm 10 min 200 rpm 1 min 20 min Condition 3 Stirring speed Stirring time Stirring speed Stirring time Identity 60 rpm 20 min 200 rpm 1 min 20 min Condition 4 Stirring speed Stirring time Stirring speed Stirring time Identity 60 rpm 30 min 200 rpm 1 min 20 min

end. Experimental condition 1

PAHCS PAC 17% Alum 7% FeSO ₄ FeCl ₃ Input amount (mg / ℓ) 20 20 20 20 20 T-P (mg / l) 0.594 0.601 1.674 1.254 0.903 Removal rate (%) 69.5 69.2 15.5 35.7 53.7

I. Experimental Condition 2

PAHCS PAC 17% Alum 7% FeSO ₄ FeCl ₃ Input amount (mg / ℓ) 20 20 20 20 20 T-P (mg / l) 0.576 0.581 1.603 1.209 0.869 Removal rate (%) 70.4 70.2 17.8 38.0 55.4

All. Experimental Condition 3

PAHCS PAC 17% Alum 7% FeSO ₄ FeCl ₃ Input amount (mg / ℓ) 20 20 20 20 20 T-P (mg / l) 0.605 0.627 1.681 1.259 0.954 Removal rate (%) 69.0 67.8 13.8 35.4 51.1

la. Experimental Condition 4

PAHCS PAC 17% Alum 7% FeSO ₄ FeCl ₃ Input amount (mg / ℓ) 20 20 20 20 20 T-P (mg / l) 0.714 0.722 1.701 1.279 1.001 Removal rate (%) 63.4 63.0 12.7 34.4 48.6

6. Test according to the stirring time when slow mixing at 70 rpm

The properties of the raw water are as shown in Table 56, and the experimental conditions are as shown in Table 57. Results according to the experimental conditions are shown in Table 58 to Table 61.

won
Number Temperature
(℃) pH Turbidity
(NTU) alkalinity (mg / ℓ) SS
(Mg / l) TP
(Mg / l) 18.7 6.92 7.28 91 2.53 2.008

Jar-test condition Condition 1 Stirring speed Stirring time Stirring speed Stirring time Identity 70 rpm 5 min 200 rpm 1 min 20 min Condition 2 Stirring speed Stirring time Stirring speed Stirring time Identity 70 rpm 10 min 200 rpm 1 min 20 min Condition 3 Stirring speed Stirring time Stirring speed Stirring time Identity 70 rpm 20 min 200 rpm 1 min 20 min Condition 4 Stirring speed Stirring time Stirring speed Stirring time Identity 70 rpm 30 min 200 rpm 1 min 20 min

end. Experimental condition 1

PAHCS PAC 17% Alum 7% FeSO ₄ FeCl ₃ Input amount (mg / ℓ) 20 20 20 20 20 T-P (mg / l) 0.637 0.653 1.582 1.277 0.968 Removal rate (%) 68.3 67.5 21.2 36.4 51.8

I. Experimental Condition 2

PAHCS PAC 17% Alum 7% FeSO ₄ FeCl ₃ Input amount (mg / ℓ) 20 20 20 20 20 T-P (mg / l) 0.603 0.608 1.577 1.218 0.937 Removal rate (%) 70.0 69.9 21.5 39.3 53.3

All. Experimental Condition 3

PAHCS PAC 17% Alum 7% FeSO ₄ FeCl ₃ Input amount (mg / ℓ) 20 20 20 20 20 T-P (mg / l) 0.683 0.702 1.588 1.305 0.997 Removal rate (%) 66.0 65.0 20.9 35.0 50.3

la. Experimental Condition 4

PAHCS PAC 17% Alum 7% FeSO ₄ FeCl ₃ Input amount (mg / ℓ) 20 20 20 20 20 T-P (mg / l) 0.707 0.714 1.594 1.322 0.999 Removal rate (%) 64.8 64.4 20.6 34.2 50.2

7. Test according to the stirring time when slow mixing at 80 rpm

The properties of the raw water are as shown in Table 62 and the experimental conditions are as shown in Table 63. Results according to the experimental conditions are shown in Tables 64 to 67.

won
Number Temperature
(℃) pH Turbidity
(NTU) alkalinity (mg / ℓ) SS
(Mg / l) TP
(Mg / l) 18.7 6.53 7.74 84 2.58 0.569

Jar-test condition Condition 1 Stirring speed Stirring time Stirring speed Stirring time Identity 80 rpm 5 min 200 rpm 1 min 20 min Condition 2 Stirring speed Stirring time Stirring speed Stirring time Identity 80 rpm 10 min 200 rpm 1 min 20 min Condition 3 Stirring speed Stirring time Stirring speed Stirring time Identity 80 rpm 20 min 200 rpm 1 min 20 min Condition 4 Stirring speed Stirring time Stirring speed Stirring time Identity 80 rpm 30 min 200 rpm 1 min 20 min

end. Experimental condition 1

PAHCS PAC 17% Alum 7% FeSO ₄ FeCl ₃ Input amount (mg / ℓ) 20 20 20 20 20 T-P (mg / l) 0.249 0.261 0.433 0.301 0.288 Removal rate (%) 56.2 54.1 23.9 47.1 49.4

I. Experimental Condition 2

PAHCS PAC 17% Alum 7% FeSO ₄ FeCl ₃ Input amount (mg / ℓ) 20 20 20 20 20 T-P (mg / l) 0.231 0.247 0.426 0.293 0.269 Removal rate (%) 59.4 56.6 25.1 48.5 52.7

All. Experimental Condition 3

PAHCS PAC 17% Alum 7% FeSO ₄ FeCl ₃ Input amount (mg / ℓ) 20 20 20 20 20 T-P (mg / l) 0.258 0.277 0.437 0.324 0.291 Removal rate (%) 54.7 51.3 23.2 43.1 48.9

la. Experimental Condition 4

PAHCS PAC 17% Alum 7% FeSO ₄ FeCl ₃ Input amount (mg / ℓ) 20 20 20 20 20 T-P (mg / l) 0.271 0.281 0.443 0.338 0.301 Removal rate (%) 52.4 50.6 22.1 40.6 47.1

As shown in the experimental results according to the slow mixing reaction time of Experimental Example 2 described above, it was the best in terms of TP removal rate to stir for 10 min at a stirring speed of 20 to 80 rpm as a result of the first to seventh tests in the slow mixing. It can be seen. In particular, in the case of TP removal rate, condition 2 (20-80 rpm, stirring time 10 min) was the best as a result of the first to seventh tests, and condition 1 (20-80 rpm, stirring time 5 min) and conditions It was found to be excellent in the order of 3 (20 to 80 rpm, stirring time 20 min), condition 4 (20 to 80 rpm, stirring time 30 min).

Experimental Example 3

Experiment with slow mixing speed

1. Test according to the speed of 5 minutes of slow mixing

The properties of the raw water are as shown in Table 68, and the experimental conditions are as shown in Table 69. Results according to the experimental conditions are shown in Tables 70 to 76.

won
Number Temperature
(℃) pH Turbidity
(NTU) alkalinity (mg / ℓ) SS
(Mg / l) TP
(Mg / l) 18.6 6.77 7.54 86 2.73 1.993

Jar-test condition Condition 1 Stirring speed Stirring time Stirring speed Stirring time Identity 20 rpm 5 min 200 rpm 1 min 20 min Condition 2 Stirring speed Stirring time Stirring speed Stirring time Identity 30 rpm 5 min 200 rpm 1 min 20 min Condition 3 Stirring speed Stirring time Stirring speed Stirring time Identity 40 rpm 5 min 200 rpm 1 min 20 min Condition 4 Stirring speed Stirring time Stirring speed Stirring time Identity 50 rpm 5 min 200 rpm 1 min 20 min Condition 5 Stirring speed Stirring time Stirring speed Stirring time Identity 60 rpm 5 min 200 rpm 1 min 20 min Condition 6 Stirring speed Stirring time Stirring speed Stirring time Identity 70 rpm 5 min 200 rpm 1 min 20 min Condition 7 Stirring speed Stirring time Stirring speed Stirring time Identity 80 rpm 5 min 200 rpm 1 min 20 min

end. Experimental condition 1

PAHCS PAC 17% Alum 7% FeSO ₄ FeCl ₃ Input amount (mg / ℓ) 20 20 20 20 20 T-P (mg / l) 0.697 0.785 1.323 1.043 0.992 Removal rate (%) 65.0 60.6 33.6 47.7 50.2

I. Experimental Condition 2

PAHCS PAC 17% Alum 7% FeSO ₄ FeCl ₃ Input amount (mg / ℓ) 20 20 20 20 20 T-P (mg / l) 0.688 0.732 1.317 1.022 0.987 Removal rate (%) 65.5 63.3 33.9 48.7 50.5

All. Experimental Condition 3

PAHCS PAC 17% Alum 7% FeSO ₄ FeCl ₃ Input amount (mg / ℓ) 20 20 20 20 20 T-P (mg / l) 0.650 0.712 1.306 1.005 0.965 Removal rate (%) 67.4 64.3 34.5 49.6 51.6

la. Experimental Condition 4

PAHCS PAC 17% Alum 7% FeSO ₄ FeCl ₃ Input amount (mg / ℓ) 20 20 20 20 20 T-P (mg / l) 0.624 0.677 1.297 0.998 0.932 Removal rate (%) 68.7 66.0 34.9 49.9 53.2

hemp. Experimental Condition 5

PAHCS PAC 17% Alum 7% FeSO ₄ FeCl ₃ Input amount (mg / ℓ) 20 20 20 20 20 T-P (mg / l) 0.634 0.685 1.301 1.012 0.997 Removal rate (%) 68.2 65.6 34.7 49.2 50.0

bar. Experimental Condition 6

PAHCS PAC 17% Alum 7% FeSO ₄ FeCl ₃ Input amount (mg / ℓ) 20 20 20 20 20 T-P (mg / l) 0.628 0.682 1.311 1.018 0.988 Removal rate (%) 68.5 65.8 34.2 48.9 50.4

four. Experimental Condition 7

PAHCS PAC 17% Alum 7% FeSO ₄ FeCl ₃ Input amount (mg / ℓ) 20 20 20 20 20 T-P (mg / l) 0.698 0.700 1.354 1.033 1.007 Removal rate (%) 65.0 64.9 32.1 48.2 49.5

2. Test according to the speed of mixing at 10 minutes of slow mixing

The properties of the raw water are as shown in Table 77, and the experimental conditions are as shown in Table 78. Results according to the experimental conditions are shown in Tables 79 to 85.

won
Number Temperature
(℃) pH Turbidity
(NTU) alkalinity (mg / ℓ) SS
(Mg / l) TP
(Mg / l) 18.8 6.81 7.31 87 2.33 2.131

Jar-test condition Condition 1 Stirring speed Stirring time Stirring speed Stirring time Identity 20 rpm 10 min 200 rpm 1 min 20 min Condition 2 Stirring speed Stirring time Stirring speed Stirring time Identity 30 rpm 10 min 200 rpm 1 min 20 min Condition 3 Stirring speed Stirring time Stirring speed Stirring time Identity 40 rpm 10 min 200 rpm 1 min 20 min Condition 4 Stirring speed Stirring time Stirring speed Stirring time Identity 50 rpm 10 min 200 rpm 1 min 20 min Condition 5 Stirring speed Stirring time Stirring speed Stirring time Identity 60 rpm 10 min 200 rpm 1 min 20 min Condition 6 Stirring speed Stirring time Stirring speed Stirring time Identity 70 rpm 10 min 200 rpm 1 min 20 min Condition 7 Stirring speed Stirring time Stirring speed Stirring time Identity 80 rpm 10 min 200 rpm 1 min 20 min

end. Experimental condition 1

PAHCS PAC 17% Alum 7% FeSO ₄ FeCl ₃ Input amount (mg / ℓ) 20 20 20 20 20 T-P (mg / l) 0.584 0.627 1.862 1.321 0.885 Removal rate (%) 72.6 70.6 12.6 38.0 58.5

I. Experimental Condition 2

PAHCS PAC 17% Alum 7% FeSO ₄ FeCl ₃ Input amount (mg / ℓ) 20 20 20 20 20 T-P (mg / l) 0.577 0.625 1.654 1.221 0.851 Removal rate (%) 72.9 70.7 22.4 42.7 60.1

All. Experimental Condition 3

PAHCS PAC 17% Alum 7% FeSO ₄ FeCl ₃ Input amount (mg / ℓ) 20 20 20 20 20 T-P (mg / l) 0.511 0.593 1.578 1.198 0.814 Removal rate (%) 76.0 72.2 26.0 43.8 61.8

la. Experimental Condition 4

PAHCS PAC 17% Alum 7% FeSO ₄ FeCl ₃ Input amount (mg / ℓ) 20 20 20 20 20 T-P (mg / l) 0.451 0.547 1.552 1.190 0.763 Removal rate (%) 78.8 74.3 27.2 44.2 64.2

hemp. Experimental Condition 5

PAHCS PAC 17% Alum 7% FeSO ₄ FeCl ₃ Input amount (mg / ℓ) 20 20 20 20 20 T-P (mg / l) 0.478 0.555 1.577 1.211 0.792 Removal rate (%) 77.6 74.0 26.0 43.2 62.8

bar. Experimental Condition 6

PAHCS PAC 17% Alum 7% FeSO ₄ FeCl ₃ Input amount (mg / ℓ) 20 20 20 20 20 T-P (mg / l) 0.501 0.567 1.603 1.300 0.843 Removal rate (%) 76.5 73.4 24.8 39.0 60.4

four. Experimental Condition 7

PAHCS PAC 17% Alum 7% FeSO ₄ FeCl ₃ Input amount (mg / ℓ) 20 20 20 20 20 T-P (mg / l) 0.536 0.597 1.622 1.338 0.878 Removal rate (%) 74.8 72.0 23.9 37.2 58.8

3. Slow mixing 20 minutes test according to the mixing speed

The properties of the raw water are as shown in Table 86 and the experimental conditions are as shown in Table 87. Results according to the experimental conditions are shown in Tables 88 to 94.

won
Number Temperature
(℃) pH Turbidity
(NTU) alkalinity (mg / ℓ) SS
(Mg / l) TP
(Mg / l) 18.4 6.87 7.88 88 2.67 2.112

Jar-test condition Condition 1 Stirring speed Stirring time Stirring speed Stirring time Identity 20 rpm 20 min 200 rpm 1 min 20 min Condition 2 Stirring speed Stirring time Stirring speed Stirring time Identity 30 rpm 20 min 200 rpm 1 min 20 min Condition 3 Stirring speed Stirring time Stirring speed Stirring time Identity 40 rpm 20 min 200 rpm 1 min 20 min Condition 4 Stirring speed Stirring time Stirring speed Stirring time Identity 50 rpm 20 min 200 rpm 1 min 20 min Condition 5 Stirring speed Stirring time Stirring speed Stirring time Identity 60 rpm 20 min 200 rpm 1 min 20 min Condition 6 Stirring speed Stirring time Stirring speed Stirring time Identity 70 rpm 20 min 200 rpm 1 min 20 min Condition 7 Stirring speed Stirring time Stirring speed Stirring time Identity 80 rpm 20 min 200 rpm 1 min 20 min

end. Experimental condition 1

PAHCS PAC 17% Alum 7% FeSO ₄ FeCl ₃ Input amount (mg / ℓ) 20 20 20 20 20 T-P (mg / l) 0.686 0.706 1.560 1.306 1.110 Removal rate (%) 67.5 66.6 26.1 38.2 47.4

I. Experimental Condition 2

PAHCS PAC 17% Alum 7% FeSO ₄ FeCl ₃ Input amount (mg / ℓ) 20 20 20 20 20 T-P (mg / l) 0.667 0.684 1.397 1.274 1.024 Removal rate (%) 68.4 67.6 33.9 39.7 51.5

All. Experimental Condition 3

PAHCS PAC 17% Alum 7% FeSO ₄ FeCl ₃ Input amount (mg / ℓ) 20 20 20 20 20 T-P (mg / l) 0.622 0.641 1.271 1.119 0.998 Removal rate (%) 70.5 69.6 39.8 47.0 52.7

la. Experimental Condition 4

PAHCS PAC 17% Alum 7% FeSO ₄ FeCl ₃ Input amount (mg / ℓ) 20 20 20 20 20 T-P (mg / l) 0.598 0.611 1.154 1.108 0.944 Removal rate (%) 71.7 71.1 45.4 47.5 55.3

hemp. Experimental Condition 5

PAHCS PAC 17% Alum 7% FeSO ₄ FeCl ₃ Input amount (mg / ℓ) 20 20 20 20 20 T-P (mg / l) 0.602 0.634 1.159 1.113 0.955 Removal rate (%) 71.5 70.0 45.1 47.3 54.8

bar. Experimental Condition 6

PAHCS PAC 17% Alum 7% FeSO ₄ FeCl ₃ Input amount (mg / ℓ) 20 20 20 20 20 T-P (mg / l) 0.663 0.697 1.337 1.127 0.997 Removal rate (%) 68.6 67.0 36.7 46.6 52.8

four. Experimental Condition 7

PAHCS PAC 17% Alum 7% FeSO ₄ FeCl ₃ Input amount (mg / ℓ) 20 20 20 20 20 T-P (mg / l) 0.674 0.701 1.339 1.138 0.958 Removal rate (%) 68.1 66.8 36.6 46.1 54.6

4. Slow Mixing According to the Mixing Speed at 30 Minutes

The properties of the raw water are as shown in Table 95 and the experimental conditions are as shown in Table 96. Results according to the experimental conditions are shown in Tables 97-103.

won
Number Temperature
(℃) pH Turbidity
(NTU) alkalinity (mg / ℓ) SS
(Mg / l) TP
(Mg / l) 18.9 6.78 7.55 86 2.77 0.531

Jar-test condition Condition 1 Stirring speed Stirring time Stirring speed Stirring time Identity 20 rpm 30 min 200 rpm 1 min 20 min Condition 2 Stirring speed Stirring time Stirring speed Stirring time Identity 30 rpm 30 min 200 rpm 1 min 20 min Condition 3 Stirring speed Stirring time Stirring speed Stirring time Identity 40 rpm 30 min 200 rpm 1 min 20 min Condition 4 Stirring speed Stirring time Stirring speed Stirring time Identity 50 rpm 30 min 200 rpm 1 min 20 min Condition 5 Stirring speed Stirring time Stirring speed Stirring time Identity 60 rpm 30 min 200 rpm 1 min 20 min Condition 6 Stirring speed Stirring time Stirring speed Stirring time Identity 70 rpm 30 min 200 rpm 1 min 20 min Condition 7 Stirring speed Stirring time Stirring speed Stirring time Identity 80 rpm 30 min 200 rpm 1 min 20 min

end. Experimental condition 1

PAHCS
2500 PAC 17% Alum 7% FeSO ₄ FeCl ₃ Input amount (mg / ℓ) 20 20 20 20 20 T-P (mg / l) 0.198 0.206 0.418 0.334 0.306 Removal rate (%) 62.7 61.2 21.3 37.1 42.4

I. Experimental Condition 2

PAHCS PAC 17% Alum 7% FeSO ₄ FeCl ₃ Input amount (mg / ℓ) 20 20 20 20 20 T-P (mg / l) 0.193 0.198 0.407 0.311 0.296 Removal rate (%) 63.7 62.7 23.4 41.4 44.3

All. Experimental Condition 3

PAHCS PAC 17% Alum 7% FeSO ₄ FeCl ₃ Input amount (mg / ℓ) 20 20 20 20 20 T-P (mg / l) 0.188 0.191 0.387 0.303 0.284 Removal rate (%) 64.6 64.0 27.1 42.9 46.5

la. Experimental Condition 4

PAHCS PAC 17% Alum 7% FeSO ₄ FeCl ₃ Input amount (mg / ℓ) 20 20 20 20 20 T-P (mg / l) 0.187 0.191 0.374 0.299 0.277 Removal rate (%) 64.8 64.0 29.6 43.7 47.8

hemp. Experimental Condition 5

PAHCS PAC 17% Alum 7% FeSO ₄ FeCl ₃ Input amount (mg / ℓ) 20 20 20 20 20 T-P (mg / l) 0.193 0.204 0.377 0.305 0.296 Removal rate (%) 63.7 61.6 29.0 42.6 44.3

bar. Experimental Condition 6

PAHCS PAC 17% Alum 7% FeSO ₄ FeCl ₃ Input amount (mg / ℓ) 20 20 20 20 20 T-P (mg / l) 0.196 0.214 0.407 0.324 0.301 Removal rate (%) 63.1 59.7 23.4 39.0 43.3

four. Experimental Condition 7

PAHCS PAC 17% Alum 7% FeSO ₄ FeCl ₃ Input amount (mg / ℓ) 20 20 20 20 20 T-P (mg / l) 0.219 0.217 0.424 0.358 0.314 Removal rate (%) 58.8 59.1 20.2 32.6 40.9

Experimental results according to the slow mixing speed of Experimental Example 3 in the case of slow stirring 5 minutes and 10 minutes Condition 4 (slow stirring speed 50 rpm), Condition 5 (slow stirring speed 60 rpm), condition 6 (slow stirring speed 70 rpm) The TP removal rate was the highest at, and at 20 and 30 minutes of slow stirring, the TP removal rate was the best at condition 3 (40 rpm), 4 (50 rpm), and 5 (60 rpm). Excellent.

As described above, when the technology according to the present invention is examined as a result of Tables 2 to 103, it was found that it is the best to perform rapid mixing after slow mixing when mixing with water treatment in T-P removal. In particular, in the removal of T-P, it was found that it was best to stir for 10 minutes under agitation speed of 40 to 70 rpm during slow mixing, followed by stirring for 1 minute under agitation speed of 200 rpm which proceeded to rapid mixing.

The technology according to the present invention is not limited to the above-described embodiments, but may be variously modified and implemented within the range permitted by the technical idea of the present invention.

Claims (8)

In the process of treating wastewater such as water, sewage, industrial wastewater, lake water, process water and water treatment process water by chemical treatment method using flocculant, ,
A flocculant was introduced into the wastewater on the flocculation tank at a dose of 5 to 120 mg / l. The rapid stirring for 30 to 90 seconds at a stirring speed of 220 RPM, the water treatment method using the electrical neutralization rate of the colloidal particles, characterized in that the water treatment by precipitation or filtration. The flocculant of claim 1, wherein the flocculant added to the flocculation tank is any one flocculant or at least two kinds of flocculants comprising aluminum salts, iron salts, calcium, magnesium, rare earth metals, and compounds of rare earth metals and aluminum salts. Comprising a configuration in which the flocculant is mixed, when mixing two or more flocculants, the water treatment method using the electrical neutralization rate control of the colloidal particles, characterized in that the mixing in the same proportion. The method of claim 2, wherein the aluminum salt-based flocculant is polyaluminum hydrochloride Chloro Sulfate (PAHCS), polyhydric acid hydrochloride Chloro Sulfate Silicate (PAHCSS), poly aluminum chloride (Polyaluminum Chloride: PAC ), Poly Aluminum Chloride Silicate (PACS), Poly Sulfate Silicate (PASS), Aluminum Sulfate (AS), and Aluminum Chloride (AC) A water treatment method using an electrical neutralization rate control of colloidal particles, characterized in that it comprises one or more selected from among the above flocculants or flocculants containing an organic polymer compound in these flocculants. The method of claim 2, wherein the iron salt coagulant includes iron sulfate (Ferric Sulfate: FS), iron polysulfate (Poly-Ferric Sulfate (PFS), iron chloride (Ferric Chloride (FC)), poly iron chloride (Poly-Ferric Chloride: PFC ), At least one flocculant selected from the group consisting of aluminum (Ferric Aluminum: FA) and polyaluminum iron chlorosulfate (PAICS) or at least one flocculant containing an organic polymer compound in these flocculants. Water treatment method using the electrical neutralization rate control of the colloidal particles, characterized in that made. 3. The method of claim 2, wherein the calcium-based flocculant is calcium (Ca) or polyaluminum calcium chloride (PACCS). The method of claim 2, wherein the magnesium-based flocculant is magnesium (Mg) or magnesium sulfate (Magnesium Sulfate: MgSO ₄ ). The method of any one of claims 1 to 6, characterized in that the slow agitation for 5 to 30 minutes at a stirring speed of 10 to 20 RPM in the third after the rapid rapid stirring of the electrical of the colloidal particles Water treatment method using neutralization rate control. 8. The method of claim 7, wherein the mixing method by collision, the mixing method by fluid, the mixing method by air, the mixing method, which is a mechanical mixing method of the same strength as the stirrer to stir through the rotation of the stirring blade when mixing the flocculant into the waste water. Water treatment method using the electrical neutralization rate control of the colloidal particles, characterized in that can be applied to the mixing method and the mixing method through the line (flow path).