KR20050005111A - Manufacturing method of waste water cohesive agents and manufactured goods thereof - Google Patents

Abstract

PURPOSE: To provide a preparation method of polyaluminum hydroxy chlorosulfate as coagulant having stability and superior coagulation capability at 70% or more of basicity by improving a demerit of existing aluminum-based and iron-based inorganic coagulants that unstable products having monomolecular and low molecular weight or low basicity are precipitated, and a coagulant for wastewater treatment prepared thereby. CONSTITUTION: In a method for preparing a coagulant for wastewater treatment for precipitating the suspended particles by chemically coagulating suspended particles suspended in sewage or wastewater, thereby forming floc, the preparation method of coagulant for wastewater treatment comprises first step of mixing 15 to 28 wt.% of aluminum hydroxide(Al(OH)3) in which concentration of aluminum oxide(Al2O3) is 40 to 68%, 50 to 75 wt.% of hydrochloric acid(HCl) having concentration of 25 to 35%, 0.5 to 10 wt.% of sulfuric acid(H2SO4) having concentration of 50 to 98% and 0.6 to 25 wt.% of water(H2O); second step of preparing low basicity aluminum chlorosulfate(AlClSO4) in which aluminum oxide(Al2O3) has concentration of 9 to 14% and basicity of 10% or less by reacting the mixture of the first step at a temperature of 90 to 125 deg.C for 5 to 20 hours; third step of mixing 46 to 66 wt.% of the low basicity aluminum chlorosulfate prepared in the second step, 10 to 25 wt.% of sodium hydroxide(NaOH) in which sodium oxide(Na2O) has concentration of 15 to 40% and 15 to 35 wt.% of water(H2O); and fourth step of preparing polyaluminum hydroxy chlorosulfate(Alx(OH)yCl2(SO4)z) having high molecular weight by mixing and reacting the mixture of the third step at a temperature of 20 to 60 deg.C at a rate corresponding to 1,000 seconds of speed gradient.

Description

Manufacturing method of waste water cohesive agents and manufactured goods etc.

The present invention relates to a method for producing a flocculant for water treatment and a flocculant for water treatment, and more particularly, to poly flocculant as a flocculant for water treatment which precipitates by flocculation of suspended particles suspended in sewage or sewage and waste water by chemical treatment. Aluminum sulfate (PAHCS) and its manufacturing method.

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. Such waste water contains high concentrations of organic matter such as chemical oxygen demand (COD), biochemical oxygen demand (BOD), SS (suspension material), nitrogen, phosphorus, 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.

On the other hand, in the method of removing suspended particles in the waste water during the treatment of waste water, the conventional treatment is chemical treatment, electrical treatment, filtration, membrane treatment or the like. First, the most representative treatment method is to use a coagulant in chemical treatment, and using an inorganic or organic coagulant to change the surface properties of the particles to form a floc and to precipitate the most common method until now. Known.

As the inorganic coagulant used in the above-described chemical treatment, an aluminum or iron coagulant is used, and as the organic coagulant, various kinds such as polyacrylamide, poly-d mac and polyamine are used. The greatest advantage of this chemical treatment is that it can be removed by aggregation up to 0.1 micron particle size. Therefore, the chemical coagulation treatment method is essentially used at the time of purified water treatment.

In the chemical treatment method described above, the surface of the particles dispersed in water generally has a negative charge and repels homogeneous particles, but when positive metals are introduced from the outside, a neutral reaction occurs on the surface and the particles are attracted to each other. The force of attraction is generated to induce the growth of particles, causing the flocs to grow. As the floc grows, it settles down and accumulates as sludge. The separation of water and particles through this process requires enormous processing space, processing time and processing costs. That is, when the suspended solids are removed by the above-described chemical treatment method, there is a problem in that sludge generation is inevitably raised, and there is a problem that treatment costs increase due to the use of chemicals.

On the other hand, aluminum (as a conventional inorganic coagulant) ) Flocculants and iron ( Salt-based flocculants are widely used, but these aluminum ( ) Flocculants and iron ( Salt-based flocculants are materials of low molecular weight and have a disadvantage in that the size of molecular particles in the aqueous solution is small and the effect of removing turbidity and the ability to remove organic substances such as suspended solids are not sufficient. In particular, in Korea, the high turbidity between June and September, which is the rainy season (the rainy season), has a problem that the treatment capacity is significantly reduced.

As mentioned above, conventional aluminum ( ) Flocculants and iron ( The aggregation method in the aqueous solution of the salt-based flocculant is as follows.

Conventional aluminum as described above ( ) And iron ( The salt-based inorganic coagulant has a problem in that excessive sludge occurs due to excessive injection as a monomolecular or low molecular weight flocculant.

In addition, conventional aluminum ( ) And iron ( Salt-based inorganic coagulants are not able to remove the appropriate turbidity, so that high-quality treated water cannot be obtained, and there is a problem of dementia due to aluminum and iron remaining in the treated water. Therefore, conventional aluminum ( ) And iron ( In the case of salt-based inorganic coagulants, it is difficult to use them because the dosage should be adjusted exactly.

Furthermore, conventional aluminum as described above ( ) And iron ( Salt-based inorganic coagulants have a problem that a precipitate occurs in the flocculant when stored for a long time, the loss of the product.

The present invention has been made to solve the above problems, the existing aluminum ( ) And iron ( Polysulphuric acid as a coagulant with excellent coagulation ability with stability at above 70% by improving the problem of precipitation of unstable monomolecules and low molecular weight or low base products, which are disadvantages of salt-based inorganic coagulants. An object of the present invention is to provide a method for preparing aluminum (Polyaluminum Hydroxy Chloro-Sulfate: hereinafter referred to as PAHCS) and a water treatment agent flocculant.

Another object of the present invention is aluminum chloride ( ) And sodium hydroxide ( ) To produce polyaluminum sulfate (PAHCS) as a water treatment agent coagulant by mixing the appropriate amount under appropriate conditions to improve the removal effect of organic matter in water treatment and to increase the size of floc to improve the flocculation speed. have.

Furthermore, the present invention is in addition to the above-mentioned objects aluminum chloride ( ) And sodium hydroxide ( ) To produce polyaluminum sulfate (PAHCS) as a water treatment agent coagulant by mixing the appropriate amount under appropriate conditions, so that no precipitates are generated even during long-term storage to prevent economic losses.

The present invention is configured to achieve the object as described above is as follows. That is, the method for producing a flocculant for water treatment according to the present invention is a method for producing a flocculant for water treatment in which suspended particles suspended in sewage or sewage or waste water are flocculated by a chemical treatment to form flocs, thereby (a) oxidation. aluminum( Aluminum hydroxide with a concentration of 40-68% Hydrochloric acid (15-28 wt%, concentration 25-35%) 50-75 wt% sulfuric acid (concentration 50-98%) ) 0.5 to 10 wt%, water ( ) Mixing 0.6-25 wt%; (B) The mixture of step (a) is reacted for 5 to 20 hours under the temperature condition of 90 to 125 ℃ to obtain aluminum oxide ( ) Is a low-basic aluminum chloride sulfate having a concentration of 9 to 14% and a basicity of 10% or less Preparing); (C) in step (b) aluminum oxide ( ) Is a low-basic aluminum chloride sulfate having a concentration of 9 to 14% and a basicity of 10% or less ) 46-66 wt% with sodium oxide Sodium hydroxide with a concentration of 15-40% 10-25 wt% and water ( ) Mixing 15 to 35 wt%; And (d) mixing and reacting the mixture of step (c) at a rate corresponding to a rate gradient of 1,000 seconds under a temperature condition of 30 to 60 ° C. Manufacturing).

In the above-described configuration, high molecular weight polyaluminum sulfate ( ) Is aluminum oxide ( ) 9.5-13%, basicity 50% or more, chloride ( 9-14%, sulfate ) It is manufactured to satisfy 1.0 ~ 5.0% condition.

Aluminum hydroxide of the above-mentioned step (a) ( ) Is aluminum ( It can be used in place of other compound in salt state. ) Is sulfate ion ( It can be used in place of another compound in the salt state.

In addition, in step (c), low-basic aluminum chloride sulfate ( 46-66 wt% with sodium hydroxide 10-25 wt% and water ( 4 wt% or less of calcium carbonate, based on a mixture of 15-35 wt% ) Are further mixed to make polyaluminum sulfate (Pyrochloric Acid) ) Can be made.

Calcium carbonate described above ) Is sodium carbonate ( Can be used in place of ) Is sodium aluminate ( Can be used instead.

On the other hand, the flocculant for water treatment according to the present invention (aluminum oxide ( Aluminum hydroxide with a concentration of 40-68% Hydrochloric acid (15-28 wt%, concentration 25-35%) 50-75 wt% sulfuric acid (concentration 50-98%) ) 0.5 to 10 wt%, water ( Aluminum oxide prepared by reacting 0.6-25 wt% at a temperature of 90-125 ° C. for 5-20 hours. ) Is a low-basic aluminum chloride sulfate having a concentration of 9 to 14% and a basicity of 10% or less ) 46-66 wt% with sodium oxide Sodium hydroxide with a concentration of 15-40% 10-25 wt% and water ( A high molecular weight polyaluminum sulphate solution was mixed by reacting 15 to 35 wt% at a rate equivalent to 1,000 seconds under a temperature gradient of 30 to 60 ° C. Is prepared).

The high molecular weight polyaluminum sulfate described above ( Spec) of silver aluminum oxide ( ) 9.5-13%, basicity 50% or more, chloride ( 9-14%, sulfate ) 1.0 to 5.0%.

Aluminum hydroxide of the above-described configuration ( ) Is aluminum ( It can be used in place of other compounds in the salt state, sulfuric acid ( ) Is sulfate ion ( It can be used in place of another compound in the salt state.

And, the above-described low basic aluminum chloride sulfate ( 46-66 wt% with sodium hydroxide 10-25 wt% and water ( Calcium carbonate (for mixtures mixed at a ratio of 15 to 35 wt%) ) In a proportion of up to 4 wt%, and a high molecular weight polysulfate ) Can be made.

Calcium carbonate described above ) Is sodium carbonate ( Can be used as a substitute for sodium hydroxide ( ) Is sodium aluminate ( Can be used instead.

Hereinafter, a method for preparing a flocculant for water treatment and a flocculant for water treatment according to a preferred embodiment of the present invention will be described in detail.

First, the present invention is a conventional aluminum (as revealed in the above object) ) And iron ( Improved the problem that mono-, low-molecular-weight or low-basicity products are unstable and precipitated due to the weakness of salt-based inorganic coagulant. It is about.

First, the method for producing a water treatment agent flocculant according to the present invention is, ), Hydrochloric acid( ), Sulfuric acid ( ) And water ( ), The mixing ratio of 15 to 28: 50 to 75: 0.5 to 10: 0.6 to 25 wt%.

In the above-mentioned process (a), aluminum hydroxide ( ) Is aluminum oxide ( ) Concentration is 40-68%, hydrochloric acid ( ) Concentration is 25-35%, sulfuric acid ( ), The concentration is 50 to 98%.

(B) The mixture of step (a) is reacted for 5 to 20 hours under the temperature condition of 90-125 ℃ to make low-basic aluminum chloride sulfate ( ) Will be manufactured.

Low-basic aluminum chloride sulfate prepared in the process of (b) described above ( ) Is aluminum oxide ( ) Concentration is 9-14%, and basicity is made 10% or less.

As described above, in order to prepare a high molecular weight polyaluminum sulfate (PAHCS) according to the present invention, hydrochloric acid ( ), Sulfuric acid ( ) And aluminum hydroxide ( ) In an appropriate proportion to mix low-basic aluminum chloride ( ), And the following reaction formula is hydrochloric acid ( ), Sulfuric acid ( ) And aluminum hydroxide ( ) In an appropriate proportion to mix low-basic aluminum chloride ( Is a reaction scheme for preparing

Where n and k are 0 ≦ n ≦ 1.5 and 0 ≦ k ≦ 0.5, respectively.

(C) Aluminum oxide prepared in process (b) ) Is a low-basic aluminum chloride sulfate having a concentration of 9 to 14% and a basicity of 10% or less ) And sodium hydroxide ( ) And water ( ) And the mixing ratio of 46 to 66: 10 to 25: 15 to 35 wt%.

Sodium hydroxide in the above-mentioned process (c) ) Is sodium oxide ( ), The concentration is 15 to 40%.

(D) The mixture of step (c) is mixed and reacted at a rate corresponding to a rate gradient of 1,000 seconds under a temperature condition of 30 to 60 DEG C. ).

A high molecular weight polyaluminum sulfate polychloride prepared by the mixing reaction of the above-mentioned process (d) ) Is aluminum oxide ( ) 9.5-13%, basicity 50% or more, chloride ( 9-14%, sulfate ) 1.0 to 5.0%.

As described above, the water treatment agent coagulant having stability even at a basicity of 50% or more and excellent in coagulation ability is high molecular weight polyaluminum hydrochloride Chloro-Sulfate (PAHCS) having the following reaction formula.

Here, n is 2.7 to 5 and 0 ≦ k ≦ 4.3.

The high molecular weight polyaluminum sulfate (PAHCS) having the same reaction scheme as in Scheme 2 described above is made of aluminum oxide ( ) 9.5-13%, basicity 50% or more, chloride ( 9-14%, sulfate ) It showed the best performance as flocculant for water treatment at 1.0 ~ 5.0%.

High molecular weight poly (aluminum sulfate) prepared according to the production method of the present invention as described above ( Process in the manufacturing process of 46-66 wt% with sodium hydroxide 10-25 wt% and water ( Calcium carbonate (for mixtures mixed at a ratio of 15 to 35 wt%) ) May be further mixed in a proportion of 4 wt% or less. Like this, calcium carbonate ( ) Is further mixed at a ratio of 4 wt% or less with respect to the mixture, thereby obtaining a high molecular weight polyaluminum sulfate ) Can be prepared.

As mentioned above, low-basic aluminum chloride sulfate ( 46-66 wt% with sodium hydroxide 10-25 wt% and water ( Calcium carbonate (for mixtures mixed at a ratio of 15 to 35 wt%) ) Is expressed as follows.

Here, n is 2.7 to 5 and 0 ≦ k ≦ 4.3.

Calcium carbonate in Scheme 3 described above ( ) Is sodium carbonate ( Can be replaced with). The reaction formula at this time is expressed as follows.

Here, n is 2.7 to 5 and 0 ≦ k ≦ 4.3.

On the other hand, sodium hydroxide in the configuration of the present invention ( ) Is sodium aluminate ( Can be used instead. The reaction formula at this time is expressed as follows.

Here, n is 2.7 to 5 and 0 ≦ k ≦ 4.3.

On the other hand, the manufacturing method of the flocculant for water treatment according to the present invention can be summarized as follows. That is, the flocculant for water treatment according to the present invention is aluminum oxide ( Aluminum hydroxide with a concentration of 40-68% Hydrochloric acid (15-28 wt%, concentration 25-35%) 50-75 wt% sulfuric acid (concentration 50-98%) ) 0.5 to 10 wt%, water ( Aluminum oxide prepared by reacting the mixture mixed at a ratio of 0.6 to 25 wt% for 5 to 20 hours under a temperature condition of 90 to 125 ℃ ( ) Is a low-basic aluminum chloride sulfate having a concentration of 9 to 14% and a basicity of 10% or less ) 46-66 wt% with sodium oxide Sodium hydroxide with a concentration of 15-40% 10-25 wt% and water ( The aluminum oxide mixture was mixed and reacted at a rate corresponding to a rate gradient of 1,000 seconds under a temperature condition of 30 to 60 ° C. ) 9.5-13%, basicity 50% or more, chloride ( 9-14%, sulfate High molecular weight polyaluminum sulfate (1.0-5.0%) ) Can be prepared.

The following is a low basic aluminum chloride sulfate { : Aluminum Chloro-Sulfate (hereinafter referred to as ACS)} and high molecular weight polyaluminum sulfate of the present invention { : PAHCS)}.

Example 1

-Production of low basic ACS.

Aluminum oxide ( Moisture filter cake {Aluminum hydroxide ( )} 27.1 wt% hydrochloric acid with a concentration of 31.5% ( ) 61 wt% sulfuric acid (concentration 93.5%) ) 5.3 wt%, water ( After mixing at a ratio of 6.6 wt%, the reaction was performed for 12 hours under a temperature condition of 100 ° C. ) Concentration 13.4%, chloride ( ) 18%, sulfate ( ) 4.9% low basic aluminum chloride (ACS) was prepared.

Aluminum oxide prepared as in Example 1 described above ( ) Concentration 13.4%, chloride ( ) 18%, sulfate ( 4.9% of low basic aluminum chloride (ACS) results in aluminum oxide ( ) Concentration 10% or more, Basicity 50% or more, Chloride ( ) 11% or more, sulfate ( ) Is used to prepare polyaluminum sulfate (PAHCS) of 2.5% or more.

Example 2

ACS and sodium hydroxide of Example 1 ) Reaction.

Aluminum oxide ( ) Concentration 13.4%, chloride ( ) 18%, sulfate ( 59.1 wt% of low basic aluminum chloride (ACS) with 4.9% sodium oxide ( Sodium hydroxide with a concentration of 15-40% 10 wt% calcium carbonate ) 0.4 wt% After mixing at a rate of 30.5 wt%, the reaction mixture was mixed at a rate corresponding to a rate gradient of 1,000 seconds under a temperature condition of 50 ° C. or less to prepare polyaluminum sulfate (PAHCS).

At this time, diluted sodium hydroxide ( ) Solution is a low basic aluminum chloride (ACS) / calcium carbonate ( ) Is mixed under high shear stress (homo-mixing). In this reaction, aluminum oxide ( ) Concentration 10.5%, Basicity 50%, Chloride ( ) 12%, sulfate ( 2.9% polyaluminum sulfate (PAHCS) was prepared.

Example 3

-Production of low basic ACS.

Aluminum oxide ( Moisture filter cake {aluminum hydroxide () )} 23.7 wt% hydrochloric acid with a concentration of 31.5% ( 67.1 wt% sulfuric acid (concentration 93.5%) ) 4.1 wt%, water ( ) Was mixed at a ratio of 5.1 wt% and reacted for 12 hours at a temperature of 110 ° C. ) Concentration 13.4%, chloride ( ) 18%, sulfate ( 3.8% low basic aluminum chloride (ACS) was prepared.

Aluminum oxide prepared as in Example 1 described above ( ) Concentration 13.4%, chloride ( ) 18%, sulfate ( 3.8% of low basic aluminum chloride (ACS) results in aluminum oxide ( ) Concentration 10% or more, Basicity 70% or more, Chloride ( ) 9% or more, sulfate ( ) Is used to prepare polyaluminum sulfate (PAHCS) of 1.5% or more.

Example 4

ACS and sodium hydroxide of Example 3 ) Reaction.

Aluminum oxide ( ) Concentration 13.4%, chloride ( ) 18%, sulfate ( 46.4 wt% low basic aluminum chloride (ACS) 3.8%, sodium oxide ( Sodium hydroxide with a concentration of 15-40% 16.7 wt% calcium carbonate ) 2.4 wt% After mixing at a rate of 34.5 wt%, the reaction mixture was mixed at a rate corresponding to a rate gradient of 1,000 seconds under a temperature condition of 50 ° C. or less to prepare polyaluminum sulfate (PAHCS).

At this time, diluted sodium hydroxide ( ) Solution is a low basic aluminum chloride (ACS) / calcium carbonate ( ) Is mixed under high shear stress (homo-mixing). In this reaction, aluminum oxide ( ) Concentration 10.5%, Basicity 79%, Chloride ( ) 10%, sulfate ( ) 1.7% polyaluminum sulfate (PAHCS) was prepared.

Example 5

First, hydrochloric acid with a concentration of 31.5% ( 83.6 wt% sulfuric acid (concentration 93.5%) ) 9.3 wt%, water ( After mixing at a ratio of 7.1 wt%, the temperature of the mixture was raised to a temperature of 75 ° C. At this point, the reaction was continued with an additional amount of hydrochloric acid ( ) Was added and reacted under a reaction temperature range of 75 to 90 ° C.

As described above, hydrochloric acid ( ), While the temperature of the reactor may drop during the additional supply, the temperature was supplied from the outside.

Meanwhile, hydrochloric acid ( After completing the additional supply of Moisture filter cake {aluminum hydroxide () ) Was mixed with 23.6 wt% of the mixed reaction to complete the reaction. At this time, hydrochloric acid ( ) And sulfuric acid ( ) And water ( Mixed reactant and aluminum hydroxide ( Because of the endothermic reaction of), the temperature is maintained between 90 and 125 ° C.

After the reaction as described above was carried out for 8 to 10 hours, aluminum oxide ( ) Concentration 12.5%, Basicity 8%, Chloride ( ) 21.8%, sulfate ( ) Low basic aluminum chloride (ACS) having a specification of 3.5% was prepared.

As described above, aluminum oxide ( ) Concentration 12.5%, Basicity 8%, Chloride ( ) 21.8%, sulfate ( After preparing a low basic aluminum chloride (ACS) having a specification of 3.5%, it is cooled to a temperature of 60 ℃, 46 wt% of a low basic aluminum chloride (ACS), sodium oxide ( Sodium hydroxide with a concentration of 20.2% 18.3 wt% calcium carbonate ) 0.4 wt% ) And reacted by mixing at a rate of 35.3 wt%. In this reaction, the non-viscous milky turbid liquid was gradually cleared within 24 hours to produce a finished product.

The product prepared as described above is a high molecular weight polyaluminum sulfate (PAHCS) which is the object of the present invention. At this time, the specification of the manufactured polyaluminum sulfate (PAHCS) is aluminum oxide ( ) Concentration 10.5%, Basicity 79%, Chloride ( ) 10%, sulfate ( ) 1.7%.

Aluminum oxide of the present invention prepared as described above ( ) 9.5-13%, basicity 50% or more, chloride ( 9-14%, sulfate High molecular weight polyaluminum sulfate (1.0-5.0%) ) Is the traditional aluminum ( ) And iron ( ) The problem of precipitation of mono- and low-molecular-weight or low-base products, which are disadvantages of salt-based inorganic coagulants, has been improved.The problem of precipitation is stable.

Moreover, the aluminum oxide according to the present invention ( ) 9.5-13%, basicity 50% or more, chloride ( 9-14%, sulfate High molecular weight polyaluminum sulfate (1.0-5.0%) ) Can prevent economic losses because sediment does not occur even during long-term storage.

The present invention is not limited to the above embodiments, and various modifications can be made within the scope of the technical idea of the present invention.

As described above, according to the present invention, conventional aluminum ( ) And iron ( By improving the problems of unstable mono- and low-molecular-weight or low-basicity products, which are disadvantages of salt-based inorganic coagulants, precipitation can be made. .

Another effect of the present invention is to produce a polyaluminum sulfate (PAHCS) as a water treatment agent flocculant by mixing an appropriate amount of low-basic aluminum chloride (ACS) and sodium hydroxide under appropriate conditions to improve the removal effect of organic matter in water treatment By improving the size of the flocs (Floc) there is an effect that can further improve the aggregation rate.

In addition, the present invention, in addition to the effects described above, by mixing a moderate amount of low-basic aluminum chloride (ACS) and sodium hydroxide under appropriate conditions to produce a polyaluminum sulfate (PAHCS) as a water treatment agent flocculant even during long-term storage This can prevent economic losses.

Claims (14)

In the method of producing a flocculant for water treatment in which suspended particles suspended in sewage or sewage and waste water are flocculated by chemical treatment to form flocs, (A) Aluminum oxide ( Aluminum hydroxide with a concentration of 40-68% Hydrochloric acid (15-28 wt%, concentration 25-35%) 50-75 wt% sulfuric acid (concentration 50-98%) ) 0.5 to 10 wt%, water ( ) Mixing 0.6-25 wt%; (B) The mixture of step (a) is reacted for 5 to 20 hours under the temperature condition of 90 to 125 ℃ to obtain aluminum oxide ( ) Is a low-basic aluminum chloride sulfate having a concentration of 9 to 14% and a basicity of 10% or less Preparing); (C) in step (b) aluminum oxide ( ) Is a low-basic aluminum chloride sulfate having a concentration of 9 to 14% and a basicity of 10% or less ) 46-66 wt% with sodium oxide Sodium hydroxide with a concentration of 15-40% 10-25 wt% and water ( ) Mixing 15 to 35 wt%; And (D) The mixture of step (c) is mixed and reacted at a rate corresponding to a rate gradient of 1,000 seconds under a temperature condition of 20 to 60 DEG C. Method for producing a flocculant for water treatment, characterized in that it comprises a step of producing). The method of claim 1, wherein the high molecular weight polyaluminum sulfate ( ) Is aluminum oxide ( ) 9.5-13%, basicity 50% or more, chloride ( 9-14%, sulfate A method for producing a flocculant for water treatment, characterized by satisfying a condition of 1.0 to 5%. The method of claim 1, wherein the aluminum hydroxide of step (a) ) Is aluminum ( A method for producing a flocculant for water treatment, which can be used in place of another compound in a salt state. According to claim 1, wherein the step (a) sulfuric acid ( ) Is sulfate ion ( A method for producing a flocculant for water treatment, which can be used in place of another compound in a salt state. The method of claim 1, wherein the step (c) comprises the low basic aluminum chloride sulfate ( 46-66 wt% with sodium hydroxide 10-25 wt% and water ( 4 wt% or less of calcium carbonate, based on a mixture of 15-35 wt% ) Are further mixed with a polyaluminum sulfate having a basicity of at least 70% The manufacturing method of the flocculant for water treatment characterized by the above-mentioned. The method of claim 5, wherein the calcium carbonate ( ) Is sodium carbonate ( Method for producing a flocculant for water treatment, characterized in that to be replaced by). 7. The method according to any one of claims 1 to 6, wherein the sodium hydroxide of step (c) ) Is sodium aluminate ( Method for producing a flocculant for water treatment, characterized in that to be replaced by). Aluminum oxide ( Aluminum hydroxide with a concentration of 40-68% Hydrochloric acid (15-28 wt%, concentration 25-35%) 50-75 wt% sulfuric acid (concentration 50-98%) ) 0.5 to 10 wt%, water ( Aluminum oxide prepared by reacting 0.6-25 wt% at a temperature of 90-125 ° C. for 5-20 hours. ) Is a low-basic aluminum chloride sulfate having a concentration of 9 to 14% and a basicity of 10% or less ) 46-66 wt% with sodium oxide Sodium hydroxide with a concentration of 15-40% 10-25 wt% and water ( A high molecular weight polyaluminum sulphate solution was mixed by reacting 15 to 35 wt% at a rate equivalent to 1,000 seconds under a temperature gradient of 30 to 60 ° C. A flocculant for water treatment prepared by). The method of claim 8, wherein the high molecular weight poly (aluminum sulfate) ) Is aluminum oxide ( ) 9.5-13%, basicity 50% or more, chloride ( 9-14%, sulfate ) 1.0 to 5.0% of the flocculant for water treatment, characterized by satisfying the conditions. The method of claim 8, wherein the aluminum hydroxide ( ) Is aluminum ( ) A flocculant for water treatment, which can be used in place of another compound in a salt state. According to claim 8, wherein the sulfuric acid ( ) Is sulfate ion ( ) A flocculant for water treatment, which can be used in place of another compound in a salt state. 12. The method according to any one of claims 8 to 11, wherein the low basic aluminum chloride sulfate ( 46-66 wt% with sodium hydroxide 10-25 wt% and water ( Calcium carbonate (for mixtures mixed at a ratio of 15 to 35 wt%) ) In a proportion of up to 4 wt%, and a high molecular weight polysulfate A flocculant for water treatment, characterized in that the) to be prepared. The method of claim 11, wherein the calcium carbonate ( ) Is sodium carbonate ( A flocculant for water treatment, characterized in that it can be used to replace). The method of claim 11, wherein the sodium hydroxide ( ) Is sodium aluminate ( A flocculant for water treatment, characterized in that to be used in place of).