KR20200070084A - Preparation method for flocculant composition for treating wastewater with improved water treatment efficiency - Google Patents

Abstract

The present invention relates to a manufacturing method of a water treatment flocculant with improved water treatment efficiency. The coagulant manufactured by the method according to the invention is stable for a long time. Even if a small amount is added compared to polyaluminum chloride, aluminum sulfate, etc., which are commonly used, floc formation is larger and harder, thereby improving water treatment efficiency. Particularly, solubility in wastewater containing soluble phosphorus, nitrogen, and fluorine as well as SS and turbidity particulate properties can be remarkably lowered, and the sludge volume is reduced to enable stable water treatment.

Description

{Preparation method for flocculant composition for treating wastewater with improved water treatment efficiency}

The present invention relates to a method for preparing a coagulant composition for water treatment with improved water treatment efficiency, a coagulant composition prepared according to the method, and a water treatment method using the same.

When solid particles, etc., are present in water, the process of removing and/or separating these particles has been used in various fields such as the food treatment industry as well as the food and chemical industries. In particular, flocculation and sedimentation processes are used in many processes such as sewage and wastewater treatment, water purification, groundwater treatment, red tide removal, purification of contaminated soil treated water, treatment of contaminated water such as lake purification, and production of industrial/agricultural/drinking water. Recently, as environmental pollution has emerged as a social problem, development of a coagulant showing excellent efficacy in removing contaminants is required.

In general, in the case of a coagulant for a high base, floc is larger and harder than that of a general coagulant, so it is known that the sedimentation speed is fast, and thus the water treatment efficiency is excellent. have. However, in the case of a coagulant with a high basicity, turbidity and SS are very excellent, but there is a problem that they cannot be treated in sewage and wastewater containing a large amount of soluble phosphorus, nitrogen, and fluorine, not particulate colloids.

Therefore, aluminum sulfate, polyaluminum chloride, and the like are frequently used in sewage and wastewater treatment plants containing a large amount of soluble phosphorus, nitrogen, and fluorine. However, this is effective for removing dissolved phosphorus, nitrogen, and fluorine when influent sewage and wastewater are introduced, but there is also a problem that SS and turbidity cannot be removed. In addition, when the raw water containing a lot of particulate phosphorus, nitrogen, fluorine, etc. is introduced, there is a problem that SS, turbidity as well as phosphorus and nitrogen fluorine are not treated. In particular, aluminum sulfate has the advantage of being inexpensive as a single-molecule coagulant, but has a disadvantage that the coagulation effect is lower than that of the polymer coagulant, and the alkalinity and pH of the treated water are largely reduced after treatment.

Until now, there is no coagulant capable of treating both particle and solubility, and in the case of sewage and wastewater treatment plants, the properties of the raw water are easily changed, and thus, water treatment is very difficult. In addition, in the case of sewage and wastewater treatment plants, sludge is conveyed to maintain the mixed liquer suspended solid (MLSS) for biological treatment, and when the amount of sludge conveyed is increased or the water treatment efficiency is low, the sludge interface becomes high, causing pin flocking to occur. There is this.

Meanwhile, hydrofluoric acid is a material used in the display and semiconductor industries, and is a highly toxic and corrosive material. In particular, the amount used for the surface treatment and etching processes continues to increase. Because hydrofluoric acid has different concentrations depending on the process used and different types of chemicals used together, wastewater generated also has different properties, and fluoride ion concentration of wastewater generated in the glass etching process is usually 500~2,000 mg/ The concentration change is large, and it exists at a relatively high concentration. Fluorine is an element that causes fatal toxicity when its value exceeds 5 mg/L, and the concentration of fluorine in industrial wastewater is regulated as a management item that must be managed and treated very carefully.

The most commonly used method for removing fluorine is a cohesive precipitation process that forms poorly soluble CaF ₂ precipitates using calcium components such as slaked lime and calcium chloride. However, in some processes, the boron fluoride (BF ^4- ) produced by the reaction of the boron compound and F- does not react with calcium ions, and thus has low processing efficiency, and thus has a lot of difficulties in removing total fluoride. When the wastewater contains fluoride, fluoride remains after chemical treatment with slaked lime, which acts as a cause of exceeding the fluoride emission limit. In general, fluoride borate is decomposed using aluminum to remove total fluoride. Decomposition of fluoroborate is treated by decomposing borate fluoride into fluorine at low pH and high water temperature.

The mechanism of formation and removal of fluoroborates is as follows:

Reaction of the fluoride ion and a calcium ^{ion: Ca 2+ + 2F - = CaF} 2 ↓

Fluoride ions react with calcium ions to form poorly soluble calcium fluoride and are removed as precipitates.

Accordingly, the dissolved phosphorus, nitrogen, fluorine, and SS have excellent removal effects, together with a turbidity improvement effect, and also an improved form of coagulant that reduces the sludge volume and lowers the height of the sludge interface during sewage/wastewater treatment. Is necessary.

Throughout this specification, a number of papers and patent documents are referenced and their citations are indicated. The disclosures of cited papers and patent documents are incorporated by reference into this specification as a whole, and the level of the technical field to which the present invention pertains and the content of the present invention are more clearly described.

Korean Registered Patent No. 1,409,870 (Registered on June 3, 2014) Korean Registered Patent No. 1,374,191 (2014.3.7. registration) Korean Registered Patent No. 1,661,179 (Registration on September 23, 2016) Japanese Patent No. 4,136,107 (Registration on June 3, 2008) Korean Registered Patent No. 1,101,760 (Registered on Dec. 27, 2011) Korean Registered Patent No. 735,540 (registered on 28.06.200)

Seungwoo Han et al., Physical Effects in Manufacturing Al(III)-Based Inorganic Polymer Coagulant for Water Treatment, Journal of the Korean Society for Chemical Engineering, Vol. 42, No. 5, Passage 226, pp. 612-618 (October 2004) Geumgangseok, a study on the characteristics of the flocculant PAC and LAS for water treatment and injection rate, Jeonnam University Master's Thesis Hyungjin Kim, Development and commercialization of highly functional aluminum-based flocculant for water treatment, Commax Chemical (2012)

In the present invention, it is possible to remove suspended solids (SS), as well as soluble phosphorus, nitrogen, and fluorine in treating sewage and wastewater, and to improve turbidity, while producing a stable coagulant and preparing according to these manufacturing methods It is an object to provide a method for improving the water treatment efficiency by providing the flocculant composition and applying the same.

In addition, in the present invention, the purpose is to provide a method for stable water treatment by lowering the height of the sludge interface during sewage and wastewater treatment by minimizing sludge volume due to superior sedimentation properties than inorganic flocculants currently on the market. .

In addition, the present invention is applied variously to sewage and wastewater treatment, and when flocculant polyaluminum chloride, aluminum sulfate, and the like, are commonly used, floc formation is larger and harder even with a smaller amount than that required, and water treatment The aim is to provide a method of improving efficiency and also significantly reducing water treatment costs.

Other objects and advantages of the present invention will become more apparent from the following detailed description of the invention, claims and drawings.

The polyaluminum sulphate-based coagulant prepared according to the production method of the present invention maintains excellent cohesive performance, has excellent stability such as no precipitation of solid precipitates over a long period of storage, as well as soluble phosphorus, nitrogen, and fluorine. By removing suspended solids (SS), improving turbidity, and minimizing sludge volume, we newly discovered that stable water treatment is possible by lowering the height of the sludge interface during sewage and wastewater treatment. The present invention has been completed.

Hereinafter, the present invention will be described in more detail.

The present invention relates to a method for producing polyaluminum chloride sulfate comprising the following steps:

(a) Aluminum oxide 40-70% by weight of aluminum hydroxide (Al(OH) ₃ ) 15-25% by weight, 20-40% by weight of hydrochloric acid 50-75% by weight, and water 10-35% by weight of aluminum oxide Preparing aluminum chloride having 9 to 15% by weight and a basicity of 0.1 to 5%;

(b) Aluminum oxide 40-70% by weight of aluminum hydroxide (Al(OH) ₃ ) 8-15% by weight, 60-98% by weight of sulfuric acid 12-30% by weight, water 55-80% by weight of aluminum oxide 5 to 9% by weight, producing a sulfate of 10 to 30% by weight of sulfate ion;

(c) 10 to 20% by weight of NaOH with a concentration of 10 to 50% by weight of sodium oxide (Na ₂ O) is added to 80 to 90% by weight of the mixture obtained in step (b) and reacted at a temperature of 50 to 200°C. To prepare 3-8% by weight of aluminum oxide and 10-27% by weight of basic sulfate sulfate;

(d) 60 to 85% by weight of the mixture obtained in step (a) and 15 to 40% by weight of the basic aluminum sulfate obtained in step (c) are mixed and reacted at a temperature of 100 to 200°C to obtain a basicity of 15 to 40% Preparing an aluminum chloride sulfate; And

(e) 10 to 25% by weight of sodium aluminate having a sodium oxide (Na ₂ O) concentration of 10 to 40% by weight and an aluminum oxide (Al ₂ O ₃ ) concentration of 15 to 30% by weight in 35 to 80% by weight of aluminum chloride sulfate. Method for producing polyaluminum sulfate represented by Chemical Formula 1 by mixing and reacting 7 to 50% by weight of water with a rate of 5,000 to 20,000 rpm at a temperature of 30 to 100°C:

[Formula 1]

Al _a (OH) _b Cl _c (SO ₄ ) _d

In the above formula,

6≤a≤10, 9≤b≤21, 3≤c≤13, d≤1.

In one aspect of the present invention, in Chemical Formula 1,

when a=6, 9≤b≤13, 3≤c≤7, d≤1;

when a=7, 10≤b≤15, 4≤c≤9, d≤1;

when a=8, 12≤b≤17, 5≤c≤10, d≤1;

when a=9, 13≤b≤19, 6≤c≤12, d≤1;

When a=10, 15≤b≤21, 7≤c≤13, and d≤1.

In one aspect of the present invention, in Chemical Formula 1,

a=7, b=13, c=6, d≤1, a=6, b=11, c=5, d≤1.

The polyaluminum sulphate-based coagulant prepared by the method according to the present invention maintains excellent cohesive performance and not only has excellent stability such as no precipitation of solid precipitates over a long period of storage, as well as soluble phosphorus, nitrogen, and fluorine. In addition, by removing suspended solids (SS), improving turbidity, and minimizing sludge volume, stable water treatment is possible by lowering the height of the sludge interface during sewage and wastewater treatment.

In one embodiment of the present invention, the obtained polyaluminum chloride sulfate has a concentration of Al ₂ O ₃ of 10 to 19% by weight, a basicity of 50 to 75%, and a chloride (Cl) of 10 to 20% by weight, (SO ₄ ) ^2- This may be 1 to 5% by weight.

In one aspect of the present invention, the polyaluminum chloride sulfate-based flocculant is more specifically,

1) The concentration of Al ₂ O ₃ is 10~19 wt%, 10~18 wt%, 10~17 wt%, 10~16 wt%, 10~15.5 wt%, 10~15 wt%, 10~14 wt% , 10 to 13% by weight, 10 to 12% by weight;

2) Basicity is 50~75%, 50~74%, 50~73%, 50~72%, 50~71%, 50~70%, 50~69%, 50~68%, 50~67%, 50 -66%, 50-65%, 50-64%, 50-63%, 50-62%, 50-61%, 50-60%;

3) chloride (Cl) may be 10 to 20% by weight, 10 to 19% by weight, 10 to 18% by weight, 10 to 17% by weight, 10 to 16% by weight, 10 to 15% by weight;

4) (SO ₄ ) ^2- teeth 1-5 wt%, 1-4.9 wt%, 1-4.8 wt%, 1-4.7 wt%, 1-4.6 wt%, 1-4.5 wt%, 1-4.4 wt% , 1 to 4.3% by weight, 1 to 4.2% by weight, 1 to 4.1% by weight, 1 to 4.0% by weight, and the lower limit of (SO ₄ ) ^2- is 1.1% by weight, 1.2% by weight, 1.3% by weight, 1.4% by weight % Or 1.5% by weight.

The polyaluminum sulfate prepared according to the production method according to the present invention, when the concentration of Al ₂ O ₃ , basicity, chloride concentration and the concentration range of (SO ₄ ) ^2- is within the above range, soluble phosphorus, nitrogen, Removal of fluorine and suspended solids (SS); Turbidity improvement; And the sludge volume reduction effect is the best. If it is less than the lower limit, the desired level of effect is not expressed, and if it exceeds the upper limit, the change in effect is slight or stability is not secured during manufacturing.

In one aspect of the present invention, the polyaluminum chloride sulfate-based flocculant removes soluble phosphorus, nitrogen, fluorine and particulate suspended solids (SS); Turbidity improvement; And sludge volume reduction effect.

In another aspect of the present invention, a polyaluminum chloride sulfate-based coagulant composition prepared according to the method is provided.

In another aspect of the present invention, an inorganic metal compound may be additionally added to the polyaluminum chloride-based coagulant composition. As the inorganic metal compound, Si, Ca, Mg, La, Be, B, Fe, Ga, Ge, Y, Zr, Na, and K may be used, but are not limited thereto.

The polyaluminum sulphate-based coagulant, URC (Ultra rapid coagulation) method, A ² O (Anaerobic Anoxic Aerobic) method, MLE (Modified Ludzack-Ettinger) method, MRB (Membrane Bioreactor) method, SBR during sewage and wastewater treatment process (Sequencing Batch Reactor) method, BARDENPHO method, and DNR (Daewoo Nutrient Removal) method can be applied to one or more methods selected from the group consisting of.

In one aspect of the present invention, the polyaluminum sulphate-based flocculant is treated with contaminated water such as sewage or wastewater to remove soluble phosphorus, nitrogen, fluorine and suspended solids (SS); Improve turbidity; A method of treating contaminated water, which reduces sludge volume, is provided.

In the present specification, unless otherwise stated,% means weight%.

The polyaluminum sulphate-based coagulant prepared according to the manufacturing method of the present invention maintains excellent cohesive performance, has excellent stability such as no precipitation of solid precipitates over a long period of storage, as well as soluble phosphorus, nitrogen, and fluorine. By removing suspended solids (SS), improving turbidity, and minimizing sludge volume, stable water treatment is possible by lowering the height of the sludge interface during sewage and wastewater treatment.

1 is a graph showing the results of measuring the effect on SS and TP values when the basicity% and chloride% conditions are the same and Al ₂ O ₃ % is different.
2 is a photograph showing the results of measuring the effect on the value of SV ₃₀ when the basicity and the chloride% condition are the same and Al ₂ O ₃ % is different.
3 is a graph showing the results of measuring the effect on SS and TP values when the Al ₂ O ₃ % and chloride% conditions are the same and the basicity% is different.
4 is a graph showing the results of measuring the effect on SS and TP values when Al ₂ O ₃ % and basicity% conditions are the same and different chloride %.
5A, 5B, 5C, and 5D show the stability test results of products by aluminum oxide concentration, basicity, chloride concentration, and sulfate ion concentration.
Figure 6 shows the results of a comparative experiment of the stability of the product manufactured according to the conventional manufacturing method and the product manufactured by the method according to the present invention.

Hereinafter, the present invention will be described in more detail through examples. These examples are only intended to illustrate the present invention more specifically, it will be apparent to those skilled in the art that the scope of the present invention is not limited by these examples according to the gist of the present invention. .

Example

Manufacturing example. Preparation of flocculants

(Preparation of the primary mixture) Aluminum hydroxide 15 to 25% by weight, 60% by weight of aluminum oxide, 35% by weight of hydrochloric acid 50 to 75% by weight of water 10 to 35% by weight of aluminum oxide, 9 to 15% by weight, basicity of 0.1 to 5% aluminum chloride was prepared.

(Preparation of secondary mixture) Aluminum oxide 5 to 9 wt% sulfuric acid by mixing aluminum hydroxide 8 to 15 wt%, 60 to 98 wt% sulfuric acid 12 to 30 wt%, and water 55 to 80 wt% Aluminum sulfate having an ion of 10 to 30% by weight was prepared.

Sodium oxide (Na ₂ O) concentration of 10 to 50% by weight is added to 10 to 20% by weight of NaOH to 80 to 90% by weight of the secondary mixture, reacting at a temperature of 50 to 200°C, and 3 to 8% by weight of aluminum oxide. , A basic aluminum sulfate having a sulfate ion of 10 to 27% by weight was prepared. 60 to 85% by weight of the primary mixture and 15 to 40% by weight of the basic aluminum sulfate were mixed and reacted at a temperature of 100 to 200°C to prepare aluminum chloride sulfate having a basicity of 15 to 40%. Sodium aluminate 10 to 25% by weight and 7 to 7% by weight of sodium chloride (Na ₂ O) concentration of 10 to 40% by weight, aluminum oxide (Al ₂ O ₃ ) concentration of 35 to 80% by weight of aluminum chloride sulfate 50 wt% was mixed and reacted at a rate of 5,000 to 20,000 rpm at a temperature of 30 to 100° C. to prepare polyaluminum chloride sulfate having a molecular structure formula of Al ₇ (OH) ₁₃ Cl ₆ SO ₄ .

Example.

Coagulants as shown in the table below were prepared by the method as described in the Preparation Examples above:

No. Al ₂ O ₃ basicity chloride SO ₄ ^2- Example 1 10.5 60 11 2 Example 2 12.5 60 12 2 Example 3 16 60 13 2 Example 4 10.5 60 13 2 Example 5 13 60 13 2 Example 6 14 60 13 2 Example 7 18 60 13 2 Example 8 19 60 13 2 Example 9 16 50 13 2 Example 10 16 55 13 2 Example 11 16 65 13 2 Example 12 16 70 13 2 Example 13 16 75 13 2 Example 14 16 60 10 2 Example 15 16 60 12 2 Example 16 16 60 14 2 Example 17 16 60 16 2 Example 18 16 60 18 2 Example 19 16 60 20 2 Example 20 13 60 13 0 Example 21 13 60 13 One Example 22 13 60 13 3 Example 23 13 60 13 4 Example 24 13 60 13 5 Example 25 12.5 60 14 2 Example 26 14.5 60 13 2 Example 27 15 60 13 2 Example 28 15.5 60 13 2 Example 29 15.5 50 13 2 Example 30 15.5 55 13 2 Example 31 15.5 65 13 2 Example 32 15.5 70 13 2 Example 33 15.5 60 10 2 Example 34 15.5 60 12 2 Example 35 15.5 60 14 2 Example 36 15.5 60 16 2 Example 37 15.5 60 18 2 Example 38 15.5 60 20 2 Example 39 15.5 55 11 1.5 Example 40 15.7 62 12.5 One Example 41 15.1 68 14 3 Example 42 15.8 65 15 2.5 Example 43 15.2 60 12 3.5 Example 44 16 60 13 3 Example 45 15.5 65 15 2.5 Example 46 15 65 13 2.5 Example 47 15.5 58 15 3 Example 48 10.4 59 11 5 Example 49 12.7 62 14 4 Example 50 15.6 61 15 2.5 Example 51 10.6 56 10 4.5 Example 52 12.5 63 13 3.5 Example 53 15.9 65 14 3 Example 54 11 57 11 4 Example 55 12.7 58 12 3 Example 56 15.4 60 15 2.5 Example 57 10.8 63 11 3.5 Example 58 12.9 59 12 2.5 Example 59 16.2 61 15 2 Example 60 10.5 62 12 3 Example 61 12.4 57 12 3 Example 62 16.5 60 14 3 Example 63 10.2 62 10 2.5 Example 64 12.5 56 12 2.5 Example 65 15 65 11 2.5 Example 66 11 58 12 3 Example 67 13.3 64 14 3 Example 68 15.5 61 16 3 Example 69 11.8 65 11 3.5 Example 70 14.5 67 15 3.5 Example 71 17.6 58 13 3.5 Example 72 10.5 55 13 3 Example 73 12.2 70 13 3 Example 74 16.1 66 14 3 Example 75 11.4 61 10 3 Example 76 13.5 58 12 2.5 Example 77 15.8 64 12 2.5 Example 78 10.5 55 12 3 Example 79 12.8 63 13 2.5 Example 80 16.4 67 16 2.5 Example 81 10.6 63 11 2.5 Example 82 12.7 61 12 2 Example 83 16.3 67 17 2 Example 84 10.9 59 12 2 Example 85 12.5 60 13 2 Example 86 16.9 62 15 1.5 Example 87 11.1 61 12 2.5 Example 88 14.1 57 15 2 Example 89 16.2 64 18 1.5 Example 90 11.5 67 13 2.5 Example 91 12.3 62 13 2.5 Example 92 17.1 60 16 2

Experimental Example

Experimental Example 1. Experimental results applied to the sewage treatment plant A (general sewage)

The following is a Jar-Test comparison experiment by properties of inorganic coagulants using raw water from a sewage treatment plant. As shown in the following table, aluminum sulfate (Purchaser: Samgu Chemical Industry Co., Ltd.), SamPAC1500 (Purchaser: Samgu Chemical Industry Co., Ltd.), polyaluminum chloride (Purchaser: Samgu Chemical Industry Co., Ltd.), Examples 1 to 3, sewage collected from region A of polyaluminum hydroxide sulphate (Purchaser: Samgu Chemical Industry Co., Ltd.) at a concentration of 70 ppm each (raw water phase: SS 12.5 mg/L, TP 3.12 mg/L, TN 9.8 mg/L , SV ₃₀ 900 ml/L), suspended solids (SS), total phosphorus (Total-P, TP), total-nitrogen (Total-N, TN), and SV ₃₀ values were measured. For SS, TP, TN, and SV _30, the method described in the process test method (by the Donghwa Technology Editorial Department) (water pollution waste soil pollution) was used.

- Aluminum sulfate SamPAC1500 Polyaluminum chloride Example Polyaluminum Hydrochloride Sulfate One 2 3 Constellation Al ₂ O ₃
(weight%) 8 10.5 13 15 10.5 13 17 10.5 12.5 16 10.5 12.5 basicity
(%) - 15 15 15 40 40 40 60 60 60 70 70 chloride
(%) - 19 23 26 13 16 21 11 12 13 10.5 12.5 Sulfate ion (%) - 0.3 0.3 0.3 0.3 0.3 0.3 2 2 2 2 2 Input (ppm) 70 70 70 70 70 70 70 70 70 70 70 70 SS (mg/L) 3.7 3.2 2.9 2.6 2.8 2.4 2.1 1.5 1.3 0.9 1.2 0.9 T-P (mg/L) 2.21 1.19 0.82 0.57 1.92 1.20 0.97 1.21 0.95 0.59 1.23 0.94 T-N (mg/L) 9.1 8.4 7.7 7.3 8.9 8.5 7.9 8.3 7.9 7.4 8.3 7.8 SV ₃₀ (ml/L) 880 870 830 790 840 800 750 740 630 490 800 750 Remark 1) Raw water phase: SS 12.5mg/L, TP 3.12mg/L, TN 9.8mg/L, SV ₃₀ 900ml/L result 1) For TP and TN, 15% of low-basic polyaluminum chloride is the best.
2) In case of SS, 12.5% of polyaluminum hydroxide sulfate is the best.
3) For SV ₃₀ , 12.5% of polyaluminum hydroxide sulfate is the best.
4) In the case of Examples 1 to 3, the water treatment of SS,TP,TN as well as SV ₃₀ are very excellent.

Experimental Example 2. Experimental results applied to B wastewater treatment plant (general wastewater)

Aluminum sulfate, low-basic polyaluminum chloride in wastewater collected from area B (raw water phase: SS 140.1 mg/L, TN 36.9 mg/L, COD 120 mg/L, BOD ₅ 115.5 mg/L, SV ₃₀ 900 ml/L), After treating polyaluminum chloride, Examples 1 to 3 and polyaluminum hydroxide sulfate at a concentration of 250 ppm each and adding 25% NaOH to the values shown in the table below, SS, TN, COD, BOD ₅ and SV ₃₀ were added. It was measured. For the measurement method of SS, TN, COD, BOD ₅ and SV _30, the method described in (Water Pollution Waste Soil Contamination) Process Test Method (by Donghwa Technology Editorial Department) was used.

Aluminum sulfate SamPAC1500 Polyaluminum chloride Example Polyaluminum Hydrochloride Sulfate One 2 3 Constellation Al ₂ O ₃
(weight%) 8 10.5 13 15 10.5 13 17 10.5 12.5 16 10.5 12.5 Basicity (%) - 15 15 15 40 40 40 60 60 60 70 70 Chloride (%) - 19 23 26 13 16 21 11 12 13 10.5 12.5 Sulfate ion (%) - 0.3 0.3 0.3 0.3 0.3 0.3 2 2 2 2 2 Input (ppm) 250 250 250 250 250 250 250 250 250 250 250 250 25%NaOH (ppm) 20 20 20 20 17 17 17 10 10 10 10 10 SS (mg/L) 10.4 9.2 8.5 6.6 8.1 6.4 5.6 5.3 4.5 3.2 4.4 3.1 T-N (mg/L) 35.2 34.5 33.5 33.1 34.9 34.7 33.9 34.6 33.7 33.0 34.5 33.6 COD (mg/L) 86.2 82.9 82.3 80.5 84.7 84.3 83.5 82.1 81.4 80.2 82.9 82.2 BOD ₅ (mg/L) 89.4 85.2 83.8 81.2 87.5 86.6 85.0 84.3 82.9 81.3 86.2 83.5 SV ₃₀ (ml/L) 460 280 240 200 220 180 160 150 110 40 160 120 Remark 1) Raw water phase: SS 140.1mg/L, TN 36.9mg/L, COD 120mg/L, BOD ₅ 115.5mg/L, SV ₃₀ 900ml/L result 1) For TN, COD, and BOD ₅ , 15% of low-basic polyaluminum chloride is the best.
2) In case of SS, 12.5% of polyaluminum hydroxide sulfate is the best.
3) For SV ₃₀ , 12.5% of polyaluminum hydroxide sulfate is the best.
4) In the case of the present invention, the water treatment of SS, TN, COD, and BOD is excellent, as well as SV ₃₀ .

Experimental Example 3. Experimental results applied to the site of A sewage treatment plant (field-test)

A This is the result of comparing the inorganic flocculant by each series at the sewage treatment plant site for 5 days.

enemy SamPAC1500 Polyaluminum chloride Example 3 Polyaluminum Hydrochloride Sulfate Constellation Al ₂ O ₃ (% by weight) - 15 17 16 12.5 Basicity (%) - 15 40 60 70 Chloride (%) - 26 21 13 12.5 Sulfate ion (%) - 0.3 0.3 2 2 Input (ppm) - 40 40 40 40 Day 1 SS (mg/L) 10.5 3.1 2.6 1.6 1.6 T-P (mg/L) 2.35 0.51 0.94 0.49 0.68 SV ₃₀ (ml/L) 940 800 700 420 660 Day 2 SS (mg/L) 11.2 3.4 2.7 1.6 1.8 T-P (mg/L) 2.62 0.42 0.85 0.43 0.61 SV ₃₀ (ml/L) 800 740 680 350 620 Day 3 SS (mg/L) 9.8 3.2 2.5 1.5 1.7 T-P (mg/L) 2.09 0.37 0.79 0.37 0.56 SV ₃₀ (ml/L) 800 740 660 400 630 Day 4 SS (mg/L) 10.7 3.3 2.8 1.5 1.4 T-P (mg/L) 2.42 0.43 0.82 0.41 0.59 SV ₃₀ (ml/L) 880 790 690 420 660 Day 5 SS (mg/L) 11.2 3.7 2.6 1.5 1.6 T-P (mg/L) 2.71 0.46 0.83 0.42 0.57 SV ₃₀ (ml/L) 840 780 650 370 610 Remark 1) The development experiment was conducted for 5 days by adding coagulants for each series. result 1) For TP, low-basic polyaluminum chloride is the best.
2) For SS, polyaluminum hydroxide sulfate is the best.
3) For SV ₃₀ , polyaluminum hydroxide sulfate is the best.
4) In the case of Example 3 according to the present invention, the water treatment of SS and TP as well as SV ₃₀ are very excellent.

Experimental Example 4. Experimental results applied to the site of B wastewater treatment plant

This is the result of a comparative experiment for 5 days by adding inorganic coagulants for each series to the site of the wastewater treatment plant.

enemy SamPAC1500 Polyaluminum chloride Example 3 Polyaluminum Hydrochloride Sulfate Constellation Al ₂ O ₃ (% by weight) - 15 17 16 12.5 Basicity (%) - 15 40 60 70 Chloride (%) - 26 21 13 12.5 Sulfate ion (%) - 0.3 0.3 2 2 Input (ppm) - 700 700 700 700 25%NaOH (ppm) - 200 200 200 200 Day 1 SS (mg/L) 1,073 100.1 99.5 88.5 88.4 COD (mg/L) 973 859 895 863 887 SV ₃₀ (ml/L) 700 520 480 300 420 Day 2 SS (mg/L) 1,105 100.7 99.9 88.9 89.1 COD (mg/L) 1,004 877 901 871 891 SV ₃₀ (ml/L) 740 620 580 400 540 Day 3 SS (mg/L) 1,374 100.6 99.8 88.7 88.5 COD (mg/L) 1,027 874 892 875 889 SV ₃₀ (ml/L) 780 600 560 360 500 Day 4 SS (mg/L) 1,021 99.1 98.5 87.8 87.9 COD (mg/L) 951 868 887 865 884 SV ₃₀ (ml/L) 700 560 500 340 480 Day 5 SS (mg/L) 1,542 100.4 99.6 88.9 88.7 COD (mg/L) 1,105 881 899 879 895 SV ₃₀ (ml/L) 780 620 560 380 520 Remark 1) The development experiment was conducted for 5 days by adding coagulants for each series. result 1) In the case of COD, low-basic polyaluminum chloride is the best.
2) For SS, polyaluminum hydroxide sulfate is the best.
3) For SV ₃₀ , polyaluminum hydroxide sulfate is the best.
4) In the case of Example 3 according to the present invention, the water treatment of SS and COD as well as SV ₃₀ are very excellent.

Experimental Example 5. Comparative experiment by coagulant

① General sewage (C)

Company A Company B Company C Example 3 Constellation Al ₂ O ₃
(weight%) 12.5 12.5 12.5 16 Basicity (%) 70 60 60 60 Chloride (%) - - - 13 Sulfate ion (%) - - - 2 Input (ppm) 80 80 80 80 SS (mg/L) 1.0 1.3 1.2 0.7 T-P (mg/L) 1.4 1.2 1.1 0.6 DTP (mg/l) 0.9 0.7 0.7 0.4 PO ₄ -P (mg/l) 0.5 0.4 0.3 0.2 SV ₃₀ (ml/L) 750 590 600 450 Remark 1) Raw water phase: SS 10.5mg/L, TP 5.1mg/L, DTP 1.3mg/l, PO ₄ -P 3.8mg/l, SV ₃₀ 950ml/L

② General sewage (D)

Company A Company B Company C Example 3 Constellation Al ₂ O ₃
(weight%) 12.5 12.5 12.5 16 Basicity (%) 70 60 60 60 Chloride (%) - - - 13 Sulfate ion (%) - - - 2 Input (ppm) 50 50 50 50 SS (mg/L) 0.9 1.2 1.2 0.8 T-P (mg/L) 1.3 1.1 1.1 0.7 T-N (mg/L) 8.7 8.4 8.4 7.9 SV ₃₀ (ml/L) 750 600 580 400 Remark 1) Raw water phase: SS 9.4mg/L, TP 4.2mg/L, TN 10.5mg/l, SV ₃₀ 900ml/L

③ General sewage (E)

enemy Company A Company B Company C Example 3 Constellation Al ₂ O ₃
(weight%) - 12.5 12.5 12.5 16 Basicity (%) - 70 60 60 60 Chloride (%) - - - - 13 Sulfate ion (%) - - - - 2 Input (ppm) - 60 60 60 60 Day 1 SS (mg/L) 9.8 2.1 2.6 2.7 1.9 T-P (mg/L) 3.12 1.01 0.92 0.95 0.67 SV ₃₀ (ml/L) 850 700 620 600 350 Day 2 SS (mg/L) 10.2 2.2 2.8 2.7 1.9 T-P (mg/L) 3.72 0.98 0.91 0.90 0.64 SV ₃₀ (ml/L) 800 770 610 620 360 Day 3 SS (mg/L) 9.1 1.9 2.6 2.5 1.6 T-P (mg/L) 2.95 1.05 0.95 0.94 0.62 SV ₃₀ (ml/L) 850 780 620 590 350 Day 4 SS (mg/L) 9.3 2.0 2.7 2.7 1.9 T-P (mg/L) 3.34 0.99 0.88 0.95 0.58 SV ₃₀ (ml/L) 750 600 580 590 360 Day 5 SS (mg/L) 10.6 2.3 2.8 2.5 1.7 T-P (mg/L) 3.52 1.02 0.94 0.91 0.59 SV ₃₀ (ml/L) 850 710 610 600 380 Remark 1) The development experiment was conducted for 5 days by adding coagulants for each series.

④ Fluorine wastewater

Company A Company B Company C Example 3 Constellation Al ₂ O ₃
(weight%) 12.5 12.5 12.5 16 Basicity (%) 70 60 60 60 Chloride (%) - - - 13 Sulfate ion (%) - - - 2 Input (ppm) 2,000 2,000 2,000 2,000 SS (mg/L) 1.3 1.8 1.9 1.2 F (mg/L) 299 220 217 136 Remark 1) Raw water phase: SS 21.2mg/L F 1,275mg/l

⑤ Paper waste water

Company A Company B Company C Example 3 Constellation Al ₂ O ₃
(weight%) 12.5 12.5 12.5 16 Basicity (%) 70 60 60 60 Chloride (%) - - - 13 Sulfate ion (%) - - - 2 Input (ppm) 200 200 200 200 SS (mg/L) 64.8 72.5 72.0 64.3 COD (mg/L) 117 113 110 101 Hardness (mg/L) 1950 1920 1910 1880 Remark 1) Raw water phase: SS 10,980mg/L COD 732mg/l, hardness 2030mg/L

Experimental Example 6.

① Comparison of aluminum oxide

- Coagulant composition Example 4 Example 5 Example 6 Example 3 Example 7 Example 8 Constellation Al ₂ O ₃
(weight%) 10.5 13 14 16 18 19 basicity(%) 60 60 60 60 60 60 chloride(%) 13 13 13 13 13 13 Sulfate ion
(%) 2 2 2 2 2 2 Input (ppm) 60 60 60 60 60 60 SS (mg/L) 2.2 1.9 1.3 1.1 0.9 0.7 T-P (mg/L) 1.3 1.1 0.6 0.5 0.5 0.4 graph Fig. 1 SV ₃₀ (ml/L) 900 850 550 530 500 480 Figure 2 Remark 1) Raw water phase: SS 10.2mg/L, TP 3.8mg/L, SV ₃₀ 950ml/L
2) For comparison according to the aluminum oxide properties of the coagulant according to the present invention, the conditions of 60% basicity and 13% chloride were fixed in the same manner, and prepared by varying the Al ₂ O ₃ concentration. result 1) As shown in the above results, the optimal Al ₂ O ₃ is judged to be 14% or more.
2) Stability was not secured to produce more than 19% Al ₂ O ₃ at a basicity of 60%.

② Comparison by basicity

- Coagulant composition Example 9 Example 10 Example 3 Example 11 Example 12 Example 13 Constellation Al ₂ O ₃
(weight%) 16 16 16 16 16 16 basicity(%) 50 55 60 65 70 75 chloride(%) 13 13 13 13 13 13 Sulfate ion
(%) 2 2 2 2 2 2 Input (ppm) 60 60 60 60 60 60 SS (mg/L) 1.8 1.0 0.9 0.9 0.8 0.8 T-P (mg/L) 0.9 0.5 0.4 0.3 0.3 0.2 graph Figure 3 SV ₃₀ (ml/L) 600 550 530 510 500 480 Remark 1) Raw water phase: SS 10.4mg/L, TP 3.9mg/L, SV ₃₀ 930ml/L
2) For comparison according to the basicity properties of the flocculant according to the present invention, the conditions of aluminum oxide 16% and chloride 13% were fixed in the same manner and prepared with different basicity. result 1) As shown in the above results, the optimum basicity is judged to be 55% or more.
2) Stability was not secured to produce more than 75% basicity in 16% Al ₂ O ₃ .

③ Comparison by chloride

- Coagulant composition Example 14 Example 15 Example 16 Example 17 Example 18 Example 19 Constellation Al ₂ O ₃
(weight%) 16 16 16 16 16 16 basicity(%) 60 60 60 60 60 60 chloride(%) 10 12 14 16 18 20 Sulfate ion (%) 2 2 2 2 2 2 Input (ppm) 60 60 60 60 60 60 SS (mg/L) 1.0 1.0 0.9 0.8 0.8 0.7 T-P (mg/L) 1.4 0.7 0.6 0.5 0.4 0.4 graph Fig. 4 SV ₃₀ (ml/L) 550 550 530 520 500 490 Remark 1) Raw water phase: SS 10.0mg/L, TP 3.7mg/L, SV ₃₀ 970ml/L
2) For comparison according to the chloride properties of the flocculant according to the present invention, aluminum oxide 16% and basicity 60% were fixed in the same manner, and prepared by varying chloride %. result 1) As shown in the above results, the optimum chloride is judged to be 12% or more.
2) Stability was not secured to produce more than 20% chloride at 16% Al ₂ O ₃ and 60% basicity.

④ Comparison by sulfate ion

[Table 13-1]

Experimental Example 7. Interfacial test results by coagulant (on-site, total interface height 400/unit cm)

Flocculant Example 25 Example 16 Polyaluminum Hydrochloride Sulfate Polyaluminum chloride Constellation Al ₂ O ₃
(weight%) 12.5 16 12.5 17 Basicity (%) 60 60 70 40 Chloride (%) 14 14 12.5 21 Sulfate ion (%) 2 2 2 0.3 Average interface 241 135 240 262 result 1) As a result of confirming the interface height by coagulant, Example 5 was the best.
2) As a result of confirming the interface height, Example 4, in the case of polyaluminum hydroxide sulfate
Although the basicity is high, the concentration of aluminum oxide is low and the height of the interface increases.
It seems that, in the case of polyaluminum chloride, the concentration of aluminum oxide is high, but the basicity is low, so the interface height seems to increase.
3) The higher the aluminum oxide concentration and the higher the basicity, the lower the interfacial height.
Since it is judged that the appropriate properties are Example 5, aluminum oxide 16%, basicity
60% and 14% of chloride are considered suitable.

Experimental Example 8. Comparative experiment by aluminum oxide concentration

The results of measuring SS, TP, SV ₃₀ values when treating coagulants by aluminum oxide concentration are shown in the following table:

Example 6 Example 26 Example 27 Example 28 Example 3 Constellation Al ₂ O ₃
(%) 14 14.5 15 15.5 16 Basicity (%) 60 60 60 60 60 Chloride (%) 13 13 13 13 13 Sulfate ion (%) 2 2 2 2 2 Input (ppm) 40 40 40 40 40 SS (mg/L) 1.5 1.3 0.9 0.7 0.5 T-P (mg/L) 1.4 1.2 0.7 0.5 0.4 SV ₃₀ (ml/L) 630 600 540 520 480 Remark 1) F sewage treatment plant raw water is used.
2) Raw water phase: SS 17.2mg/L, TP 2.4mg/L, SV ₃₀ 850ml/L
3) For comparison according to the aluminum oxide properties of the present invention, 60% basicity and 13% chloride were prepared in the same way. result 1) As shown in the above results, the optimal Al ₂ O ₃ is judged to be 15 to 16%.

Experimental Example 9. Comparative experiment by basicity

The results of measuring SS, TP, and SV ₃₀ values when treating the flocculants by basicity are shown in the following table:

Example 29 Example 30 Example 28 Example 31 Example 32 Constellation Al ₂ O ₃
(%) 15.5 15.5 15.5 15.5 15.5 Basicity (%) 50 55 60 65 70 Chloride (%) 13 13 13 13 13 Sulfate ion (%) 2 2 2 2 2 Input (ppm) 40 40 40 40 40 SS (mg/L) 1.5 0.8 0.6 0.4 0.4 T-P (mg/L) 0.9 0.5 0.4 0.4 0.3 SV ₃₀ (ml/L) 590 530 510 500 480 Remark 1) F sewage treatment plant raw water is used.
2) Raw water phase: SS 15.4mg/L, TP 2.5mg/L, SV ₃₀ 870ml/L
3) For comparison according to the properties of aluminum oxide of the present invention, aluminum oxide 15.5%,
Prepared the same for 13% chloride. result 1) As shown in the above results, the optimum basicity is judged to be 55% or more.

Experimental Example 10. Comparative experiment by chloride concentration

The results of measuring SS, TP, SV ₃₀ values when treating the flocculant by chloride concentration are shown in the following table:

Example 33 Example 34 Example 35 Example 36 Example 37 Example 38 Constellation Al ₂ O ₃
(%) 15.5 15.5 15.5 15.5 15.5 15.5 Basicity (%) 60 60 60 60 60 60 Chloride (%) 10 12 14 16 18 20 Sulfate ion (%) 2 2 2 2 2 2 Input (ppm) 40 40 40 40 40 40 SS (mg/L) 0.6 0.6 0.5 0.4 0.4 0.3 T-P (mg/L) 1.1 0.7 0.5 0.4 0.4 0.3 SV ₃₀ (ml/L) 540 530 520 520 500 490 Remark 1) F sewage treatment plant raw water is used.
2) Raw water phase: SS 16.1mg/L, TP 2.6mg/L, SV ₃₀ 840ml/L
3) For comparison according to the properties of aluminum oxide of the present invention, aluminum oxide 15.5%,
The basicity was also 60%. result 1) As shown in the above results, the optimum chloride is judged to be 12% or more.

Experimental Example 11. Experimental results by coagulant

① G sewage treatment plant

Example 39 Low basic polyaluminum chloride Polyaluminum chloride Polyaluminum Hydrochloride Sulfate Constellation Al ₂ O ₃ (%) 15.5 15 17 12.5 Basicity (%) 55 15 40 70 Chloride (%) 11 26 21 12.5 Sulfate ion (%) 1.5 0.3 0.3 2 Input (ppm) 70 70 70 70 SS (mg/L) 0.6 2.7 2.1 0.6 T-P (mg/L) 0.43 0.45 0.97 0.93 COD (mg/L) 7.4 7.5 8.4 8.1 SV ₃₀ (ml/L) 620 840 720 700 Remark 1) Raw water phase: SS 25.1mg/L, TP 5.1mg/L, COD 11.3mg/L, SV ₃₀ 950ml/L result In the case of the present invention, it is shown that SV ₃₀ is very excellent as well as water treatment of SS, TP, and TN.

② A wastewater treatment plant

Example 40 Low basic polyaluminum chloride Polyaluminum chloride Polyaluminum Hydrochloride Sulfate Constellation Al ₂ O ₃ (%) 15.7 15 17 12.5 Basicity (%) 62 15 40 70 Chloride (%) 12.5 26 21 12.5 Sulfate ion (%) One 0.3 0.3 2 Input (ppm) 350 350 350 350 SS (mg/L) 94 123 116 98 COD (mg/L) 239 241 295 287 SV ₃₀ (ml/L) 510 720 650 590 Remark 1) Raw water phase: SS 506g/L, COD 417mg/L, SV ₃₀ 950ml/L result In the case of the present invention, it is shown that SV ₃₀ is very excellent as well as water treatment of SS, TP, and TN.

③ H Sewage Treatment Plant

enemy Example 41 Low basic polyaluminum chloride Polyaluminum chloride Polyaluminum Hydrochloride Sulfate Constellation Al ₂ O ₃ (%) - 15.1 15 17 12.5 Basicity (%) - 68 15 40 70 Chloride (%) - 14 26 21 12.5 Sulfate ion (%) - 3.0 0.3 0.3 2 Input (ppm) - 35 35 35 35 Day 1 SS (mg/L) 4.1 0.3 1.6 1.2 0.3 T-P (mg/L) 1.21 0.11 0.12 0.42 0.40 SV ₃₀ (ml/L) 900 510 790 730 680 Day 2 SS (mg/L) 4.5 0.4 1.7 1.3 0.5 T-P (mg/L) 1.25 0.13 0.15 0.51 0.45 SV ₃₀ (ml/L) 850 480 800 740 650 Day 3 SS (mg/L) 4.7 0.3 1.7 1.2 0.5 T-P (mg/L) 1.42 0.17 0.18 0.49 0.47 SV ₃₀ (ml/L) 840 520 790 740 650 Day 4 SS (mg/L) 4.3 0.3 1.4 1.0 0.4 T-P (mg/L) 1.10 0.11 0.14 0.53 0.49 SV ₃₀ (ml/L) 910 530 820 760 700 Day 5 SS (mg/L) 4.2 0.2 1.5 1.1 0.3 T-P (mg/L) 1.27 0.14 0.16 0.52 0.51 SV ₃₀ (ml/L) 870 490 810 750 690 Remark 1) The development experiment was conducted for 5 days by adding coagulants for each series. result In the case of the present invention, it is shown that SV ₃₀ is very excellent as well as water treatment of SS and TP.

④ C wastewater treatment plant

enemy Example 42 Low basic polyaluminum chloride Polyaluminum chloride Polyaluminum Hydrochloride Sulfate Constellation Al ₂ O ₃ (%) - 15.8 15 17 12.5 Basicity (%) - 65 15 40 70 Chloride (%) - 15 26 21 12.5 Sulfate ion (%) - 2.5 0.3 0.3 2 Input (ppm) - 450 450 450 450 25% NaOH (ppm) - 150 150 150 150 Day 1 SS (mg/L) 1,224 2.3 6.2 5.1 2.5 COD (mg/L) 80.2 56.5 56.9 60.1 59.5 SV ₃₀ (ml/L) 250 20 60 50 30 Day 2 SS (mg/L) 1,350 2.5 5.9 5.2 2.7 COD (mg/L) 85.3 26.9 57.5 59.9 59.5 SV ₃₀ (ml/L) 300 30 70 50 35 Day 3 SS (mg/L) 1,268 2.5 6.3 5.4 2.7 COD (mg/L) 79.6 26.1 56.5 60.3 60.0 SV ₃₀ (ml/L) 270 25 70 55 35 Day 4 SS (mg/L) 1,175 2.2 6.5 5.8 2.4 COD (mg/L) 83.3 57.5 57.9 60.5 59.7 SV ₃₀ (ml/L) 280 25 65 50 40 Day 5 SS (mg/L) 1,277 2.3 6.1 5.4 2.4 COD (mg/L) 86.8 56.9 57.1 60.7 60.3 SV ₃₀ (ml/L) 270 30 70 60 40 Remark 1) The development experiment was conducted for 5 days by adding coagulants for each series. result In the case of the present invention, SS, COD water treatment as well as SV ₃₀ are shown to be very excellent.

Experimental Example 12. Experimental results by coagulant

① I sewage treatment plant

enemy Example 43 Company A Company B Company C Constellation Al ₂ O ₃ (%) - 15.2 12.5 12.5 12.5 Basicity (%) - 60 70 60 60 Chloride (%) - 12 - - - Sulfate ion (%) - 3.5 - - - Input (ppm) - 35 35 35 35 Day 1 SS (mg/L) 19.0 4.5 5.2 5.4 6.1 T-P (mg/L) 2.35 0.51 1.11 0.95 1.01 SV ₃₀ (ml/L) 800 460 710 650 610 Day 2 SS (mg/L) 18.5 4.1 5.4 5.5 6.2 T-P (mg/L) 2.70 0.54 1.07 0.90 0.96 SV ₃₀ (ml/L) 820 470 750 620 580 Day 3 SS (mg/L) 20.7 3.9 5.1 5.3 5.9 T-P (mg/L) 2.51 0.5 1.13 0.89 0.97 SV ₃₀ (ml/L) 790 430 720 460 630 Day 4 SS (mg/L) 19.5 4.6 5.0 5.3 6.0 T-P (mg/L) 2.65 0.49 1.16 0.85 0.95 SV ₃₀ (ml/L) 740 450 730 630 600 Day 5 SS (mg/L) 18.7 4.75 4.9 5.2 5.8 T-P (mg/L) 2.43 0.52 1.17 0.91 0.98 SV ₃₀ (ml/L) 820 460 740 610 580 Remark 1) The development experiment was conducted for 5 days by adding coagulants for each series.

② A Fluorine Wastewater Treatment Plant

Example 44 Company A Company B Company C Constellation Al ₂ O ₃ (%) 16 12.5 12.5 12.5 Basicity (%) 60 70 60 60 Chloride (%) 13 - - - Sulfate ion (%) 3.0 - - - Input (ppm) 2,000 2,000 2,000 2,000 SS (mg/L) 1.2 1.3 1.8 1.9 F (mg/L) 136 299 220 217 Remark 1) Raw water phase: SS 21.2mg/L F 1,275mg/l

③ A paper waste water

Example 45 Company A Company B Company C Constellation Al ₂ O ₃ (%) 15.5 12.5 12.5 12.5 Basicity (%) 65 70 60 60 Chloride (%) 15 - - - Sulfate ion (%) 2.5 - - - Input (ppm) 400 400 400 400 20% NaOH (ppm) 150 150 150 150 SS (mg/L) 521 642 698 710 COD (mg/L) 825 921 887 907 Hardness (mg/L) 1,820 1,940 1,910 1,890 Remark 1) Raw water phase: SS 1,058mg/L COD 983mg/l, Hardness 2,210mg/L

Experimental Example 13. Interface test results by coagulant (on-site)

① J Sewage Treatment Plant

Flocculant Example 25 Example 16 Polyaluminum Hydrochloride Sulfate Polyaluminum chloride Constellation Al ₂ O ₃ (%) 12.5 16 12.5 17 Basicity (%) 60 60 70 40 Chloride (%) 14 14 12.5 21 Sulfate ion (%) 2 2 2 0.3 Average interface 241 135 252 262 result 1) As a result of confirming the interfacial height by coagulant, Example 16 was the best.
2) As a result of confirming the interface height, the present invention product 1, in the case of polyaluminum hydroxide sulfate
Although the basicity is high, the concentration of aluminum oxide is low and the height of the interface increases.
It seems that, in the case of polyaluminum chloride, the concentration of aluminum oxide is high,
It seems that the interface height is low due to low basicity.
3) The higher the aluminum oxide concentration and the higher the basicity, the lower the interfacial height.
As it is judged, the appropriate properties are the present invention product 2, aluminum oxide 16%, basicity
60% and 14% of chloride are considered suitable.

② K Sewage Treatment Plant

Flocculant Example 46 Polyaluminum Hydrochloride Sulfate Polyaluminum chloride Constellation Al ₂ O ₃ (%) 15 12.5 17 Basicity (%) 65 70 40 Chloride (%) 13 12.5 21 Sulfate ion (%) 2.5 2 0.3 Average interface 287 354 396 result 1) As a result of confirming the interfacial height by coagulant, Example 46 was the best.
2) As a result of checking the interface height, polyaluminum hydroxide has high basicity
The concentration of aluminum oxide is low, so the height of the interface seems to rise,
In the case of polyaluminum chloride, the concentration of aluminum oxide is high, but the basicity is low.
It appears that the interface height is rising.
3) The higher the aluminum oxide concentration and the higher the basicity, the lower the interfacial height.
It is judged that the appropriate properties are aluminum oxide 15%, basicity of the present invention
65% and 13% of chloride are considered suitable.

③ L Sewage Treatment Plant

Flocculant Example 47 Polyaluminum Hydrochloride Sulfate Polyaluminum chloride Constellation Al ₂ O ₃ (%) 15.5 12.5 17 Basicity (%) 58 70 40 Chloride (%) 15 12.5 21 Sulfate ion (%) 3 2 0.3 Average interface 277 338 388 result 1) As a result of confirming the interface height by coagulant, Example 47 was the best.
2) As a result of checking the interface height, polyaluminum hydroxide has high basicity
The concentration of aluminum oxide is low, so the height of the interface seems to rise,
In the case of polyaluminum chloride, the concentration of aluminum oxide is high, but the basicity is low.
It appears that the interface height is rising.
3) The higher the aluminum oxide concentration and the higher the basicity, the lower the interfacial height.
As it is judged, the proper properties are 15.5% of aluminum oxide, which is the present invention, and basicity
58% and 15% of chloride are considered suitable.

Experimental Example 14. Comparative experiment with other products

The effect of the coagulant according to the present invention with the product of Patent No. 1409870 was compared. The results are shown in the following table:

① E Water Purification Plant

Example 48 Example 49 Example 50 Citation Invention 2-1 Citation Invention 2-2 Citation Invention 2-3 Constellation Al ₂ O ₃
(%) 10.4 12.7 15.6 10.5 12.9 15.0 Basicity (%) 59 62 61 62 69 64 Chloride (%) 11 14 15 - - - Sulfate ion (%) 5 4 2.5 - - - Input (ppm) 15 15 15 15 15 15 pH 7.87 7.85 7.84 7.85 7.83 7.83 Al (mg/L) 0.045 0.044 0.047 0.071 0.074 0.073 Remark 1) Raw water phase: pH 8.15, Al 0.019mg/l

② N Sewage Treatment Plant

Example 51 Example 25 Example 53 Citation Invention 2-1 Citation Invention 2-2 Citation Invention 2-3 Constellation Al ₂ O ₃
(%) 10.6 12.5 15.9 10.5 12.9 15.0 Basicity (%) 56 63 65 62 69 64 Chloride (%) 10 13 14 - - - Sulfate ion (%) 4.5 3.5 3 - - - Input (ppm) 45 45 45 45 45 45 SS (mg/L) 1.7 1.3 0.8 2.3 1.9 1.7 T-P (mg/L) 0.55 0.48 0.37 0.69 0.62 0.58 Remark 1) Raw water phase: SS 11.6 mg/l, T-P 1.51 mg/l

③ G Sewage Treatment Plant

Example 54 Example 55 Example 56 Citation Invention 2-1 Citation Invention 2-2 Citation Invention 2-3 Constellation Al ₂ O ₃
(%) 11 12.7 15.4 10.5 12.9 15.0 Basicity (%) 57 58 60 62 69 64 Chloride (%) 11 12 15 - - - Sulfate ion (%) 4 3 2.5 - - - Input (ppm) 50 50 50 50 50 50 SS (mg/L) 2.1 1.7 1.1 2.8 2.5 2.2 T-P (mg/L) 0.91 0.78 0.61 1.21 1.08 0.97 Remark 1) Raw water phase: SS 15.3 mg/l, T-P 5.1 mg/l

④ D wastewater treatment plant

Example 57 Example 58 Example 59 Citation Invention 2-1 Citation Invention 2-2 Citation Invention 2-3 Constellation Al ₂ O ₃
(%) 10.8 12.9 16.2 10.5 12.9 15.0 Basicity (%) 63 59 61 62 69 64 Chloride (%) 11 12 15 - - - Sulfate ion (%) 3.5 2.5 2 - - - Input (ppm) 350 350 350 350 350 350 Polymer(ppm) 2 2 2 2 2 2 SS (mg/L) 140 129 107 197 171 149 T-N (mg/l) 71 68 64 79 77 73 COD (mg/L) 264 252 231 291 279 266 Remark 1) Raw water phase: SS 530 mg/l, T-N 131 mg/l, COD 340 mg/l

⑤ C paper waste water

Example 60 Example 61 Example 62 Citation Invention 2-1 Citation Invention 2-2 Citation Invention 2-3 Constellation Al ₂ O ₃
(%) 10.5 12.4 16.5 10.5 12.9 15.0 Basicity (%) 62 57 60 62 69 64 Chloride (%) 12 12 14 - - - Sulfate ion (%) 3 3 3 - - - Input (ppm) 300 300 300 300 300 300 25% NaOH (ppm) 120 120 120 120 120 120 SS (mg/L) 269 252 231 294 289 275 COD (mg/L) 1,344 1,324 1,284 1,424 1,398 1,374 Remark 1) Raw water phase: SS 1,780mg/l, COD 1,540 mg/l

Experimental Example 15 Al dissolution test results

① A Water Purification Plant

Example 63 Example 64 Example 65 Company A Company B Company C Constellation Al ₂ O ₃
(%) 10.2 12.5 15.0 12.5 12.5 12.5 Basicity (%) 62 56 65 70 60 60 Chloride (%) 10 12 11 - - - Sulfate ion (%) 2.5 2.5 2.5 - - - Input (ppm) 10 10 10 10 10 10 pH 7.68 7.67 7.67 7.67 7.62 7.61 Al (mg/L) 0.042 0.048 0.050 0.091 0.103 0.104 Turbidity (NTU) 0.332 0.302 0.227 0.348 0.372 0.355 Remark 1) Raw water phase: pH 7.81, Al 0.019mg/l, turbidity 3.42NTU

② Water Purification Plant

Example 66 Example 67 Example 68 Company A Company B Company C Constellation Al ₂ O ₃
(%) 11.0 13.3 15.5 12.5 12.5 12.5 Basicity (%) 58 64 61 70 60 60 Chloride (%) 12 14 16 - - - Sulfate ion (%) 3 3 3 - - - Input (ppm) 12 12 12 12 12 12 pH 7.75 7.74 7.72 7.73 7.68 7.68 Al (mg/L) 0.044 0.047 0.046 0.103 0.106 0.105 Turbidity (NTU) 0.408 0.327 0.296 0.558 0.553 0.527 Remark 1) Raw water phase: pH 8.01, Al 0.023mg/l, turbidity 4.71NTU

③ C Water Purification Plant

Example 69 Example 70 Example 71 Company A Company B Company C Constellation Al ₂ O ₃
(%) 11.8 14.5 17.6 12.5 12.5 12.5 Basicity (%) 65 67 58 70 60 60 Chloride (%) 11 15 13 - - - Sulfate ion (%) 3.5 3.5 3.5 - - - Input (ppm) 7 7 7 7 7 7 pH 7.85 7.83 7.82 7.83 7.79 7.78 Al (mg/L) 0.038 0.042 0.045 0.089 0.095 0.098 Remark 1) Raw water phase: pH 7.97, Al 0.016mg/l

④ D Water Purification Plant

enemy Example 72 Example 73 Example 74 Company A Company B Company C Constellation Al ₂ O ₃
(%) - 10.5 12.2 16.1 12.5 12.5 12.5 Basicity (%) - 55 70 66 70 60 60 Chloride (%) - 13 13 14 - - - Sulfate ion (%) - 3 3 3 - - - Input (ppm) - 20 20 20 20 20 20 Day 1 pH 8.12 7.74 7.73 7.71 7.74 7.68 7.69 Al (mg/L) 0.012 0.045 0.046 0.047 0.101 0.106 0.108 Day 2 pH 8.15 7.76 7.75 7.75 7.75 7.71 7.72 Al (mg/L) 0.015 0.043 0.044 0.046 0.103 0.107 0.109 Day 3 pH 8.05 7.73 7.73 7.71 7.72 7.67 7.67 Al (mg/L) 0.014 0.047 0.046 0.049 0.104 0.106 0.108 Remark 1) The field experiment was conducted for 3 days by adding coagulants for each series.

Experimental Example 16. Experimental Results

① N Sewage Treatment Plant

Example 75 Example 76 Example 77 Company A Company B Company C Constellation Al ₂ O ₃
(%) 11.4 13.5 15.8 12.5 12.5 12.5 Basicity (%) 61 58 64 70 60 60 Chloride (%) 10 12 12 - - - Sulfate ion (%) 3 2.5 2.5 - - - Input (ppm) 35 35 35 35 35 35 SS (mg/L) 2.8 2.1 1.5 2.9 3.5 3.8 T-P (mg/L) 0.44 0.27 0.18 0.67 0.59 0.62 Remark 1) Raw water phase: SS 15.4mg/l, T-P 1.24 mg/l

② M Sewage Treatment Plant

Example 78 Example 79 Example 80 Company A Company B Company C Constellation Al ₂ O ₃
(%) 10.6 12.8 16.4 12.5 12.5 12.5 Basicity (%) 55 63 67 70 60 60 Chloride (%) 12 13 16 - - - Sulfate ion (%) 3 2.5 2.5 - - - Input (ppm) 40 40 40 40 40 40 Polymer(ppm) 5 5 5 5 5 5 SS (mg/L) 1.3 0.9 0.6 1.6 1.9 2.1 T-P (mg/L) 0.44 0.27 0.18 1.11 0.97 1.06 Remark 1) Raw water phase: SS 8.7mg/l, T-P 2.22 mg/l

③ O sewage treatment plant

enemy Example 81 Example 82 Example 83 Company A Company B Company C Constellation Al ₂ O ₃
(%) - 10.6 12.7 16.3 12.5 12.5 12.5 Basicity (%) - 63 61 67 70 60 60 Chloride (%) - 11 12 17 - - - Sulfate ion (%) - 2.5 2 2 - - - Input (ppm) - 60 60 60 60 60 60 Day 1 SS
(mg/l) 21.5 2.3 1.6 1.2 2.5 3.1 3.3 T-P (mg/L) 5.45 0.59 0.45 0.38 1.11 0.87 0.94 Day 2 pH 23.7 2.2 1.9 1.5 2.3 3.0 3.2 Al (mg/L) 5.61 0.58 0.49 0.41 1.15 0.89 0.97 Day 3 pH 20.9 2.4 2.1 1.6 2.6 3.3 3.3 Al (mg/L) 5.21 0.62 0.47 0.35 1.14 0.90 0.95 Remark 1) The field experiment was conducted for 3 days by adding coagulants for each series.

④ E wastewater treatment plant

Example 84 Example 85 Example 86 Company A Company B Company C Constellation Al ₂ O ₃
(%) 10.9 12.5 16.9 12.5 12.5 12.5 Basicity (%) 59 60 62 70 60 60 Chloride (%) 12 13 15 - - - Sulfate ion (%) 2 2 1.5 - - - Input (ppm) 300 300 300 300 300 300 20% NaOH (ppm) 40 40 40 40 40 40 SS (mg/L) 5.1 3.9 2.5 7.1 8.0 9.9 COD (mg/L) 29.2 27.3 25.1 47.2 39.8 43.5 Remark 1) Raw water phase: SS 1,224mg/l, COD 80.2 mg/l

⑤ B paper waste water

Example 87 Example 88 Example 89 Company A Company B Company C Constellation Al ₂ O ₃
(%) 11.1 14.1 16.2 12.5 12.5 12.5 Basicity (%) 61 57 64 70 60 60 Chloride (%) 12 15 18 - - - Sulfate ion (%) 2.5 2 1.5 - - - Input (ppm) 250 250 250 250 250 250 Polymer(ppm) 15 15 15 15 15 15 SS (mg/L) 415 396 326 500 660 672 COD (mg/L) 700 680 650 760 730 750 Remark 1) Raw water phase: SS 1,780mg/l, COD 1,540 mg/l

⑥ B-fluorine wastewater treatment plant

Example 90 Example 91 Example 92 Company A Company B Company C Constellation Al ₂ O ₃
(%) 11.5 12.3 17.1 12.5 12.5 12.5 Basicity (%) 67 62 60 70 60 60 Chloride (%) 13 13 16 - - - Sulfate ion (%) 2.5 2.5 2 - - - Input (ppm) 1,500 1,500 1,500 1,500 1,500 1,500 F (mg/L) 278 255 215 356 297 312 Remark 1) Raw water phase: F 1,581 mg/l

Looking at the results of the experiment, the polyaluminum chloride sulfate-based flocculant prepared by the manufacturing method according to the present invention dissolves Al, SS, TP, COD, F when treating the flocculant according to the present invention compared to products of company A, company B and company C. The removal effect was found to be remarkably excellent.

Experimental Example 17. Stability test

The product manufactured by the manufacturing method according to the present invention was tested for stability after being left for 1 month, 3 months immediately after production by aluminum oxide concentration, basicity, chloride concentration, and sulfate ion concentration. The results are shown in FIGS. 5A, 5B, 5C and 5D.

As a result of the experiment, it was found that in the case of a product having aluminum oxide of 19%, white clouding occurred slightly after 1 month, and in a product with a basicity of 75%, clouding occurred after 3 months. In addition, in the case of products with 0% sulfate ions, sludge was generated after 1 month. Therefore, using the manufacturing method according to the present invention, the product has a concentration of Al ₂ O ₃ of 10 to 19% by weight, a basicity of 50 to 75%, chloride (Cl) of 10 to 20% by weight, and sulfate ions. It turned out that it is preferable to set it as 1 to 5% of range.

In addition, the stability of the product manufactured according to the manufacturing method according to the present invention and the product manufactured according to the conventional method was compared and tested. As a result, in the case of manufacturing by the manufacturing method according to the present invention, unlike the product manufactured by the conventional manufacturing method, it was found to be stable without sludge generation even after 6 months have elapsed (FIG. 6).

Since the specific parts of the present invention have been described in detail above, it is clear that for those skilled in the art, this specific technology is only a preferred embodiment, and the scope of the present invention is not limited thereto. Therefore, the substantial scope of the present invention will be defined by the appended claims and equivalents thereof.

Claims (2)

(a) Aluminum oxide 40-70% by weight of aluminum hydroxide (Al(OH) ₃ ) 15-25% by weight, 20-40% by weight of hydrochloric acid 50-75% by weight, and water 10-35% by weight of aluminum oxide Preparing aluminum chloride having 9 to 15% by weight and a basicity of 0.1 to 5%;
(b) Aluminum oxide 40-70% by weight of aluminum hydroxide (Al(OH) ₃ ) 8-15% by weight, 60-98% by weight of sulfuric acid 12-30% by weight, water 55-80% by weight of aluminum oxide 5 Preparing aluminum sulfate, which is ˜9% by weight and sulfate ions 10 to 30% by weight;
(c) 10 to 20% by weight of NaOH with a concentration of 10 to 50% by weight of sodium oxide (Na ₂ O) is added to 80 to 90% by weight of the mixture obtained in step (b) and reacted at a temperature of 50 to 200°C. To prepare 3-8% by weight of aluminum oxide and 10-27% by weight of basic sulfate sulfate;
(d) Mixing and reacting 60 to 85% by weight of the mixture obtained in step (a) and 15 to 40% by weight of the basic aluminum sulfate obtained in step (c) at a temperature of 100 to 200°C to obtain a basicity of 15 to 40% Preparing an aluminum chloride sulfate; And
(e) Sodium oxide (Na ₂ O) concentration of 10 to 40% by weight and aluminum oxide (Al ₂ O ₃ ) concentration of 15 to 30% by weight of aluminic acid in 35 to 80% by weight of aluminum chloride sulfate obtained in step (d). Comprising a step of mixing 10 to 25% by weight of sodium and 7 to 50% by weight of water at a temperature of 30 to 100°C at a rate of 5,000 to 20,000 rpm to produce polyaluminum sulfate represented by Chemical Formula 1, polychloride A coagulant composition for water treatment, which comprises polyaluminum chloride sulfate of the following Chemical Formula 1 prepared by the method of producing aluminum sulfate:
[Formula 1]
Al _a (OH) _b Cl _c (SO ₄ ) _d
In the above formula,
6≤a≤10, 9≤b≤21, 3≤c≤13, d≤1.
Comprising the step of treating the coagulant composition for water treatment according to claim 1 in contaminated water,
As the treatment,
Removal of soluble phosphorus, nitrogen, fluorine and suspended solids (SS); Turbidity improvement; And sludge volume reduction,
How to treat polluted water.

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