KR100881663B1 - Cohesive agent manufacturing method for treating acid waste water - Google Patents

Abstract

A method of manufacturing coagulant for processing acid waste water is provided to reduce a second environmental contamination generated by dumping or padding sludge in sea by replacing insufficient resources and reducing sludge generation quantity. A method of manufacturing coagulant for processing acid waste water comprises steps of: (S1) removing foreign materials including metal pieces mixed into paper sludge incinerate material; and (S2) mixing strong alkali powder and the paper sludge incinerate material powder in which the foreign materials are removed in order to improve coherence and water treatment function. In the mixing step, the paper sludge incinerate material powder in which the foreign materials are removed and the strong alkali powder are mixed to a weight ratio of 60~90:40~10.

Description

Cohesive agent manufacturing method for treating acid waste water

The present invention relates to a method for producing a flocculant for treating acidic wastewater, and more specifically, using acidic paper sludge incineration discarded as landfills, for treating acidic wastewater excellent in pH neutralization, heavy metal adsorption, color removal, and sludge reduction. To prepare and utilize a flocculant.

According to the method for producing flocculant for treating acidic wastewater according to the present invention for this purpose; First, by removing the foreign substances such as iron drift mixed in the paper sludge incineration material (10), the sorting step (S1) for recovering the high quality paper sludge incineration ash powder 20, and the high-quality paper sludge incineration ash powder ( 20) is characterized in that it comprises a mixing step (S2) for mixing the strongly alkaline powder 30 to improve the flocculation and water treatment function.

Wastewater discharged from all industrial facilities is classified as acidic wastewater 40 and alkaline wastewater. In the present application, wastewater discharged from an industrial facility, and coagulant for treating acidic wastewater for neutralizing acidic wastewater 40 to the extent possible to discharge it, and manufacturing the same I will explain how to.

The present application is a technique belonging to the field of resource recycling technology using incineration ash, which is a waste formed by incineration of sludge generated in the process of producing paper to powder to produce flocculant for acidic wastewater treatment, and is usually landfilled.

Conventional acidic wastewater 40 is a strong alkaline coagulant such as CaCO ₃ , CaO, MgO is used, acidic wastewater 40 is sulfuric acid, hydrochloric acid, nitric acid, hydrofluoric acid, when cleaning the surface of metal such as steel, steel, plating Phosphoric acid or a mixture of these acids, which is produced when dissolving a metal oxide scale attached to the surface of the metal, or is processed by corrosion of a partial metal surface using an acid, or on the product surface during the production process of the product. It is generated in large quantities by acid used in the process of corroding and removing foreign matters attached, and in the production of titanium dioxide. Acidic wastewater 40 contains H ₂ SO ₄ , FeSO ₄ , CuSO ₄ , MnSO ₄ , HCl, HNO ₃ , HF, Cr ⁺⁶ , Ni ⁺⁺ depending on the pickling solution. Various heavy metals such as Fe ^{++ e} are contained, and in particular, a large amount of Fe, Mn, and the flocculant for treating the acidic wastewater 40 must meet the discharge water quality standards, so the removal efficiency and pH of Fe and Mn The ability to raise the number (ph 9-14) should be good.

However, in the strong alkaline flocculant such as CaCO ₃ , CaO, MgO used in the water treatment of the existing acidic wastewater 40, CaCO ₃ flocculant has a function to increase the pH value of the acidic wastewater 40 to combine with metal ions to precipitate CaO flocculant has a disadvantage of falling, and the effect of increasing the pH value of the acidic wastewater 40 is precipitated in combination with metal ions, but the amount of sludge precipitated when water treatment of the acidic wastewater 40 increases MgO flocculant has a disadvantage in that the amount of sludge precipitated when water treatment of acidic wastewater 40 is reduced, but the pH increase effect is reduced, and the amount of flocculant is increased. In-magnesite relies on all imports, and its current price has risen due to rising oil prices, rising dollars, and rising labor costs, making it difficult to supply smoothly. I have a problem.

Therefore, in the treatment of acidic wastewater 40, pH neutralization function, heavy metal adsorption function, color removal function is excellent, and also reduce the amount of sludge, secondary environmental pollution, and can replace the scarce resources above all There is a need to develop flocculants for treating acidic wastewater.

Paper sludge incineration, another waste generated at industrial sites, is produced in large quantities in the paper-making process, and is a usable waste currently being treated as landfill.

In the paper sludge incineration material 10, the waste paper is crushed finely, and the paper is released in water or in a fluid gel form. The waste paper recycling process includes extracting cellulose, which does not dissolve like paper clips or staplers embedded in documents. It contains some foreign substances such as iron flakes and plastics, which remain in the paper sludge during the paper wastewater treatment process, and when the incinerated paper sludge is incinerated, it remains as a non-combustible foreign substance which is not incinerated in the paper sludge incineration ash. do.

In addition, the paper sludge incineration material 10 is incinerated by including a paper cup or a small box that is classified as sludge because the shape is not recognized in the sorting process.

The paper sludge incineration ash generated from industrial sites to recycle waste paper and the incineration ash generated from district heating construction using waste paper as fuel are collectively referred to as paper sludge incineration ash, and the strong alkaline paper sludge incineration ash (10) generated as such is commonly used. As a final treatment by landfill, there is a problem that causes serious soil contamination due to elution water.

The present invention is to solve this problem; The object of the present invention is to replace the scarce resources by using a paper sludge incineration material discarded as landfill, by producing and utilizing a coagulant for acid wastewater treatment excellent in pH neutralization function, heavy metal adsorption function, color removal function, sludge reduction function, and By reducing the amount of sludge produced, the secondary environmental pollution caused by ocean dumping or landfill of sludge has the advantage.

In accordance with an aspect of the present invention, there is provided a method for preparing an flocculant for treating acidic wastewater, including: a screening step (S1) for removing foreign substances such as iron drift mixed in the paper sludge incineration ash 10; It includes a mixing step (S2) of mixing the paper sludge incineration ash powder 20 from which the foreign matter is removed and the strong alkaline powder 30 at a predetermined ratio in order to improve the coagulation and water treatment functions, and the mixing step (S2) The removed paper sludge incineration ash powder 20 and the strongly alkaline powder 30 is characterized in that the mixture in a ratio of 60 ~ 90: 40 ~ 10 by weight ratio.

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The paper sludge incineration material 10 of the sorting step (S1) is preferably an incineration material in the form of a powder incinerated paper sludge generated during the paper wastewater treatment process at a high temperature.

The paper sludge incineration ash powder 20 of the mixing step (S2) is preferably an alkaline powder having a pH of 12.3 ~ 12.9 from which foreign matters are removed from the paper sludge incineration ash (10).

The strongly alkaline powder 30 of the mixing step (S2) is preferably a powder of pH 12.5 ~ 13.1 mixed with at least one of CaO, Na2O MgO powder.

In the detailed description of the term, the paper sludge incineration material refers to the incineration of powder form incineration of sludge, which is a precipitate generated during the treatment of wastewater during the manufacture of paper,

Strongly alkaline powder means a powder having a pH of 12.5 to 13.1 in any one of the CaO, Na 2 O, MgO powder or a composite powder,

Paper sludge incineration powder refers to a powder of PH 12.3 ~ 12.9 from which foreign substances are removed from the paper sludge incineration ash,

Acidic wastewater refers to wastewater containing H ₂ SO ₄ , Fe, Mn, and other heavy metals that exhibit acidity higher than pH 5,

Alkaline wastewater refers to wastewater containing dyes and polymer organic compounds having a higher alkalinity than pH 7.5.

The present invention manufactures and utilizes the paper sludge incineration material (10) discarded as a landfill as a coagulant for treating acidic wastewater with excellent pH neutralization function, heavy metal adsorption function, color removal function, and sludge reduction function, thereby replacing scarce resources, and By reducing the amount of generation, there is an advantage that can reduce the secondary environmental pollution caused by the landfill of sludge generated.

Figure 1 shows a block diagram showing a process for producing a flocculant for treating acidic wastewater according to the present invention, Figure 2 shows the components of the mixture according to the process according to the invention, Figure 3 is prepared for treating acidic wastewater according to the present invention 4 is an exemplary photograph showing a coagulant, and FIG. 4 shows an embodiment of water treatment of an acidic wastewater using a coagulant for treating acidic wastewater prepared according to the present invention.

Referring to this, the manufacturing method of flocculant for treating acidic wastewater according to the present invention; As shown in Figure 1, the sorting step (S1) for removing foreign matter such as iron drifts mixed in the paper sludge incineration ash (10); It includes a mixing step (S2) of mixing the paper sludge incineration ash powder 20 from which the foreign matter is removed and the strong alkaline powder 30 in a proportion to improve the water treatment function.

In the sorting step (S1) is a process for recovering a high quality paper sludge incineration ash powder 30 by removing foreign substances such as iron drift mixed in the paper sludge incineration ash 10 through the screening.

In the paper sludge incineration material (10), the waste paper is crushed finely, and it is loosened in water or in a gel so that the paper is released in the waste paper recycling process in which cellulose is extracted. It contains some foreign substances such as iron flakes and plastics, and remains in the paper sludge during the paper wastewater treatment process. When the incinerated paper sludge is incinerated, it remains as a non-combustible substance that is not incinerated in the paper sludge incineration ash. .

In addition, the paper sludge incineration material 10 is incinerated by including a paper cup or a small box that is classified as sludge because the shape is not recognized in the sorting process.

Paper sludge incineration ash generated in industrial sites for recycling waste paper and incineration ash generated in heating works using waste paper as fuel are collectively referred to as paper sludge incineration ash, and such paper sludge incineration ash 10 is usually treated by landfill for final treatment. However, the present application is to be used when treating the wastewater with the resources to be collected and discarded, and to minimize the environmental pollution caused by the landfill of the paper sludge incineration ash (10) generated in the industrial site.

Therefore, the paper sludge incineration material 10 containing the unburned foreign matter is removed through the sorting step (S1), the iron drift and the fire burning material contained in the paper sludge incineration material 10, high-quality paper sludge incineration powder ( 30) must be recovered.

In the mixing step (S2) as shown in Figures 1 and 2 the strong alkaline powder (30) in the weight ratio of high-quality paper sludge incineration ash powder (20) from which foreign substances such as iron drift, incombustibles are removed, 60 to 90 It is a process of mixing the strongly alkaline powder 30 with the paper sludge incineration ash powder 20 in order to mix in the ratio of 40-40, and to improve the flocculation and water treatment function of the flocculant for acidic wastewater treatment.

Table 1 is a table showing in detail the flocculant component for wastewater treatment according to the mixing ratio of the paper sludge incineration ash powder 20 and the strong alkaline component powder (30). Table A shows the components contained in the paper sludge incineration ash powder 20 in detail. As shown in the components, the paper sludge incineration ash powder 20 is a strong alkaline oxide of CaO, MgO, Al2O3, Fe2O3, The ratio of TiO 2, K 2 O, and Na 2 O is 67.78 wt%.

4996.0 mg / l of Fe and 204.35 mg / l of heavy metals in heavy metals, as shown in Table 2 A, which shows an example of treating acidic wastewater according to the mixing ratio of the paper sludge incineration ash powder 20 and the strong alkaline component powder 30. Only 20 g of paper sludge incineration ash powder 20 was added to 1 liter (1 L) of acidic waste water contained therein, and the result was that the heavy metal and paper sludge incineration ash powder 20 contained in the acid wastewater reacted and precipitated. Although sludge generation was very good at 30g, the pH of 7.6 increased due to the weak function of removing heavy metals, and the elution of Mn and Fe was 9.420mg / l and 6.540mg / l, respectively. It is placed on the danger line, the edge of which may exceed the acceptable range of criteria. Therefore, to use only the paper sludge incineration powder 20 as a coagulant for treating acidic wastewater, it is necessary to use a stronger coagulant because it may exceed the discharge allowable range if the conditions are slightly changed.

In the case of flocculating acidic wastewater, the pH level is increased by adding a flocculant to increase the resulting pH value. The reason is that the pH value is high to remove heavy metals contained in the wastewater. This is because the removal efficiency of is high. After coagulation of heavy metals, a small amount of acid is added to neutralize the pH values shown in Table 2 so as to meet the water quality standards to be discharged, and then discharged to complete the whole process.

Therefore, in order to improve the function of the coagulant for acidic wastewater treatment, the strong alkaline powder 30 is mixed with the paper sludge incineration ash powder 20 at a weight ratio of 60 to 90:40 to 10, and the components of the coagulant for acidic wastewater treatment. By increasing the ratio of CaO, MgO, Al2O3, Fe2O3, TiO2, K2O, and Na2O, which are heavy alkaline oxides, to 70 to 85% by weight, the flocculant for treating acidic wastewater with an increase in the ratio of strong alkaline oxides has an improved pH. As the pH raising function is improved, the amount of flocculant and the amount of sludge generated is reduced, and the removal efficiency of heavy metals is increased.

At this time, when the mixing ratio of the strongly alkaline powder 30 is 10% by weight, as shown in Table 1B, oxides capable of reacting with acidic wastewater among the coagulant components for treating acidic wastewater are CaO, MgO, Al2O3, Fe2O3, TiO2, The combined ratio of K 2 O and Na 2 O is 71.101 wt%.

4996.0 mg / l of Fe and 204.35mg / l of heavy metals in heavy metals, as shown in B of Table 2 showing an example of treatment of acidic wastewater according to the mixing ratio of the paper sludge incineration ash powder 20 and the strong alkaline powder 30. 20 g of flocculant having a mixing ratio of 10% by weight of the strongly alkaline powder 30 was added to 1 liter (1 L) of the acid wastewater contained therein, and the result was a heavy metal and paper sludge incineration powder 20 contained in the acid wastewater. Although the amount of sludge produced by the reaction was relatively good at 46 g, the amount of Fe and Mn eluted was 5.997 mg / l and 3.450 mg / l, respectively, as the pH of the sludge was relatively good. ℓ became the discharge standard, but it can be used as a flocculant to treat acidic wastewater. The.

When the mixing ratio of the strongly alkaline powder 30 is 20% by weight, as shown in Table 1C, oxides capable of reacting with acidic wastewater among the coagulant components for treating acidic wastewater are CaO, MgO, Al2O3, Fe2O3, TiO2, and K2O. , The combined ratio of Na 2 O is 74.312 wt%.

4996.0 mg / l of Fe and 204.35 mg / l of heavy metals in heavy metals, as shown in Table 2 C, which shows an example of the treatment of acidic wastewater according to the mixing ratio of the paper sludge incineration ash powder 20 and the strong alkaline component powder 30. 20 g of flocculant having a mixing ratio of 20% by weight of the strongly alkaline powder 30 was added to 1 liter (1 L) of the acid wastewater contained therein, and the result was a heavy metal and paper sludge incineration powder 20 contained in the acid wastewater. The amount of sludge produced by the reaction was relatively good at 50 g, and the pH was increased to 9.0, and the function of removing heavy metals was appropriate. The amount of Fe and Mn eluted was 3.2 mg / l and 0.933 mg / l, respectively. The acceptance criteria are suitable for use as flocculants to treat acidic wastewater, even with regard to safety.

When the mixing ratio of the strongly alkaline powder 30 is 30% by weight, as shown in D of Table 1, CaO, MgO, Al2O3, Fe2O3, TiO2, and K2O, which are oxides capable of reacting with acidic wastewater, are among the coagulant components for treating acidic wastewater. , The combined ratio of Na 2 O is 77.523 wt%.

4996.0 mg / l of Fe and 204.35 mg / l of heavy metals as shown in D of Table 2 showing an example of the treatment of acidic wastewater according to the mixing ratio of the paper sludge incineration ash powder 20 and the strong alkali component powder 30. 20 g of flocculant having a mixing ratio of 30% by weight of the strongly alkaline powder 30 was added to 1 liter (1 L) of the acid wastewater contained therein, and the result was a heavy metal and paper sludge incineration powder (20). ), The amount of sludge generated by the reaction is increased and is relatively acceptable at 60 g. The pH is increased to 10.3 to remove heavy metals, and the amount of Fe and Mn eluted is 0.503 mg / l, respectively. Since it is not detected, the discharge allowance standard is sufficient to be used as a flocculant to treat acidic wastewater even if safety is considered.

When the mixing ratio of the strongly alkaline powder 30 is 40 wt%, CaO, MgO, Al2O3, Fe2O3, TiO2, which are oxides capable of reacting with acidic wastewater, as shown in E of Table 1 , K2O, Na2O combined ratio is 80.734% by weight.

4996.0 mg / l Fe and 204.35 mg / l in heavy metals, as shown in E of Table 2 showing an example of treatment of acidic wastewater according to the mixing ratio of the paper sludge incineration ash powder 20 and the strong alkali component powder 30 20 g of flocculant having a mixing ratio of 40% by weight of strongly alkaline powder 30 was added to 1 liter (1 L) of the acid wastewater contained therein, and the result was a heavy metal and paper sludge incineration powder 20 contained in the acid wastewater. The amount of sludge produced by this reaction increases and the cost for transporting the sludge increases to 81 g, but it is generally acceptable, and the function of removing heavy metals by raising the pH to 11.9 is very effective. Elution amount of Mn is 0.2mg / l, respectively, and it is not detected, and it is sufficient to be used as flocculant to treat acidic wastewater even if safety is considered in discharge allowance standard.

Therefore, in order to meet the criteria of the final discharged water and to reduce the amount of sludge generated, it is preferable to mix the paper sludge incineration ash powder 20 and the strongly alkaline powder 30 in a weight ratio of 60 to 90:40 to 10.

(Table 1) Coagulant component for wastewater treatment according to the mixing ratio of paper sludge incineration ash powder and strong alkali ingredient powder

(A: paper sludge incineration ash powder (20) b: CaO in strongly alkaline powder (30))

division Flocculant for Acid Wastewater Treatment CaO SiO2 MgO Al2O3 Fe2O3 TiO2 K2O Na2O Etc Sum Total Strong Alkaline Powder A  Price: 100% by weight 41.4 22.9 12.1 10.9 2.08 0.60 0.35 0.46 9.21 100 67.78 B A: 90% by weight + B: 10% by weight 47.26 20.61 10.89 9.81 1.872 0.54 0.315 0.414 8.289 100 71.101 C A: 80% by weight + B: 20% by weight 53.12 18.32 9.68 8.72 1.664 0.48 0.28 0.368 7.368 100 74.312 D A: 70% by weight + B: 30% by weight 58.98 16.03 8.47 7.63 1.456 0.42 0.245 0.322 6.447 100 77.523 E A: 60% by weight + B: 40% by weight 64.84 13.74 7.26 6.54 1.248 0.36 0.21 0.276 5.526 100 80.734

Table 2 Example of Acid Wastewater Treatment According to the Mixing Ratio of Paper Sludge Incineration Ash Powder and Strong Alkaline Ingredient Powder

      (A: paper sludge incineration ash powder (20) b: CaO in strongly alkaline powder (30))

division Acid wastewater A B C D E Discharge standard  Price: 100% by weight  A: 90% by weight B: 10% by weight A: 80% by weight B: 20% by weight A: 70% by weight B: 30% by weight A: 60% by weight B: 40% by weight input 1ℓ 20 g 20 g 20 g 20 g 20 g Fe (mg / L) 4996.0 6.540 3.450 0.933 0.503 0.2 10.0 Mn (mg / L) 204.35 9.420 5.997 3.2 Not detected Not detected 10.0 pH 4.2 7.6 8.3 9.0 10.3 11.9 Sludge amount (g) 30 46 50 60 81

The wastewater treatment principle using the coagulant for treating acidic wastewater prepared as above is to mix the paper sludge incineration ash powder 20 and the strongly alkaline powder 30 in a weight ratio of 60 to 90:40 to 10, thereby treating acidic wastewater. Coagulants for acid wastewater treatment in which the proportion of strong alkaline oxides such as CaO, Na2O, MgO, etc. are increased and strong alkali oxides are increased among the components of the flocculant, increase the pH of the acid wastewater when treating the acid wastewater, and H ₂ SO _{4 in the} acid wastewater. , Fe, heavy metals such as Mn are agglomerated by reaction with acidic waste water coagulant component in the oxide of CaO, MgO, Al2O3, Fe2O3, K2O for processing, Na2O, TiO2, wherein SiO ₂ of the components of the acidic waste water treatment coagulant for is at a high temperature A zeolite-like silicate mineral that is incinerated and has a large amount of pores, and is precipitated by adsorption of a large amount of oxidized Fe, Mn and other heavy metals in an acidic wastewater, so that the precipitate is precipitated. It contains a large amount of O _2, which is easy to dehydrate, and minimizes the volume and volume of sludge.

Figure 2 shows the components of the process-specific mixture according to the present invention, Figure 3 is an exemplary photograph showing the acid wastewater treatment flocculant prepared according to the present invention, Figure 4 is an acid wastewater treatment flocculant prepared according to the present invention Shows an example of water treatment of acidic wastewater using.

The two glass containers shown in the picture are labeled A and B, and both glasses contain 1 liter of acidic wastewater.

The second photo shows that 20 g of quicklime is added to A glass container and 20 g of coagulant having 30% by weight of the mixing ratio of the strongly alkaline powder 30 shown in Table 2 as the acidic wastewater flocculant of the present application into the B glass container. Giving.

The third picture shows the picture just after stirring the mixed solution contained in the A and B glass containers for 40 minutes and removing the stirring equipment, and it can be seen that the flocculant contained in the B glass container is starting to precipitate. In the field, the mixture is sufficiently stirred for about 90 minutes in order to elicit a more reliable reaction, but the experiment of the present application shows that the reaction can be performed at twice the speed compared to the conventional method of using the field (existing). will be. This means that it can double the treatment capacity of acidic wastewater compared to the facilities installed in the model.

The fourth picture shows that 10 minutes have elapsed to settle the aggregates in the glass vessel A, and 5 minutes has elapsed to settle the aggregates in the glass vessel B. The time required for complete precipitation is quicklime. It has been shown that treating acidic wastewater with the coagulant of the present disclosure can precipitate sediments twice as fast as treating acidic wastewater using only bays.

Therefore, it is to show that it is more effective to use the coagulant for treating the acidic wastewater of the present application than to simply treat the acidic wastewater by simply adding the quicklime used in the prior art.

Table 3 below is a result table showing the results of the experiments shown in the picture shown in FIG.

Chemical Oxygen Demand (COD) refers to chemical oxygen demand. COD is a measure of the degree of contamination of water and is expressed as the amount of oxygen required to oxidize pollutants of organic matter with oxidizing agents. The unit is expressed in PPM (mg / l), and the larger this number, the more polluted the water such as the stream is.

According to the effluent water quality standards of wastewater treatment facilities (including agricultural lands and wastewater treatment facilities) from 2008.1.1 to December 31, 2012, the discharged water quality standards should be 40mg / ℓ or less (source water quality of sewage wastewater treatment facilities). The acidic wastewater COD was 640 mg / l, and the acidic wastewater treated with quicklime was 3.8 mg / l and the elution amount of Fe and Mn was 0.923 mg / l, respectively, and it was not detected. The acidic wastewater treated with 20 g of flocculant having a mixing ratio of 30% by weight of the phosphorus alkaline powder 30 exhibited a COD of 4.8 mg / l and an elution amount of Fe and Mn of 0.503 mg / l, respectively. Giving.

Table 3 Result Table

Analysis item Analysis Removal rate Acid wastewater A: When using quicklime B: When using flocculant for acid wastewater treatment A B COD (mg / l) 640 3.8 4.8 99.4% 99.3% Mn (mg / L) 204.35 Not detected Not detected 100% 100% Fe (mg / L) 4996.0 0.923 0.503 99.9% 99.9%

The flocculant was tested by administering the same ratio of 20 g each of A and B to 1 L of acidic wastewater.

As described above, the paper sludge incineration ash powder 30 is used for the wastewater treatment principle using the acidic wastewater treatment flocculant. However, the pulp sludge incineration ash powder may be collected and used in the same manner. This is because the pulp sludge is also formed of fibers forming a material of paper, and the incineration ash powder incinerated therein can neutralize acidic wastewater in the same way as the paper sludge incineration ash powder 30.

In addition, a detailed example of CaO was described as an example of the paper sludge incineration powder 30, and it can be seen that Na 2 O and MgO can be used as the equivalent material of CaO. If Na2O is used, the pH is higher than that of CaO. Therefore, the dose should be reduced. When MgO is used, the pH is lower than that of CaO. Although there is a numerical difference, the same result can be obtained.

As mentioned above, although the manufacturing method of the flocculant for acidic wastewater treatment which concerns on this invention was demonstrated, the scope of the present invention is not limited to this, It will be said that it is crazy about all the technical ideas of the range equivalent to the matter of a claim.

1 is a block diagram showing a flocculant manufacturing process for treating acidic wastewater according to the present invention

2 is a view showing the components of the mixture according to the process according to the present invention

Figure 3 is an exemplary photo showing a flocculant for treating acidic wastewater prepared according to the present invention

Figure 4 is a photograph showing an embodiment of the water treatment of the acidic wastewater using the flocculant for treating acidic wastewater prepared according to the present invention

Claims (5)

delete A screening step (S1) for removing foreign substances including iron drifts mixed in the paper sludge incineration material (10); In the manufacturing method of the coagulant for acid wastewater treatment comprising a mixing step (S2) of mixing the paper sludge incineration ash powder 20 from which the foreign matter is removed and the strong alkaline powder 30 to improve the coagulation and water treatment function, The mixing step (S2) is a coagulant preparation for acidic wastewater treatment, characterized in that mixing the paper sludge incineration ash powder 20 and the strong alkaline powder 30 from which the foreign matter is removed in a ratio of 60 ~ 90: 40 ~ 10 by weight ratio Way. The method of claim 2, Papermaking sludge incineration material (10) of the sorting step (S1) is a flocculant manufacturing method for treating acidic wastewater, characterized in that the incineration ash of the powder form incineration of paper sludge generated during the papermaking wastewater treatment process. The method of claim 2 or 3, Papermaking sludge incineration ash powder (20) of the mixing step (S2) is a flocculant manufacturing method for treating acidic wastewater, characterized in that the alkaline powder of pH 12.3 ~ 12.9 is removed from the paper sludge incineration ash (10). The method of claim 2 or 3, Strongly alkaline powder (30) of the mixing step (S2) is a powder of pH 12.5 ~ 13.1 mixed with at least one of CaO, Na2O MgO powder, characterized in that the flocculant manufacturing method for acidic wastewater treatment.

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