KR20110122985A - Producing method of phosphorus removal - Google Patents
Producing method of phosphorus removal Download PDFInfo
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- KR20110122985A KR20110122985A KR1020100042379A KR20100042379A KR20110122985A KR 20110122985 A KR20110122985 A KR 20110122985A KR 1020100042379 A KR1020100042379 A KR 1020100042379A KR 20100042379 A KR20100042379 A KR 20100042379A KR 20110122985 A KR20110122985 A KR 20110122985A
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- phosphorus
- chloride
- compound
- remover
- lanthanum
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D21/00—Separation of suspended solid particles from liquids by sedimentation
- B01D21/01—Separation of suspended solid particles from liquids by sedimentation using flocculating agents
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
- B01J20/02—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material
- B01J20/06—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material comprising oxides or hydroxides of metals not provided for in group B01J20/04
- B01J20/08—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material comprising oxides or hydroxides of metals not provided for in group B01J20/04 comprising aluminium oxide or hydroxide; comprising bauxite
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
- C02F1/5236—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using inorganic agents
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- Chemical & Material Sciences (AREA)
- Inorganic Chemistry (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Analytical Chemistry (AREA)
- Removal Of Specific Substances (AREA)
- Separation Of Suspended Particles By Flocculating Agents (AREA)
Abstract
The present invention relates to a method for preparing a phosphorus remover, and more specifically, by adding a lanthanum compound and a calcium compound to polyaluminum chloride and aluminum sulfate used as conventional flocculants, the phosphorus removal efficiency of the existing flocculant can be significantly improved. The present invention relates to a method for producing an economical phosphorus remover that can easily remove total phosphorus contained in sewage and wastewater using a small amount.
Description
The present invention relates to a method for preparing a phosphorus remover, and more particularly, to a method for preparing a phosphorus remover prepared by adding a lanthanum compound and a calcium compound to polyaluminum chloride and aluminum sulfate used as conventional flocculants.
When nutrients such as phosphorus nitrogen enter rivers or lakes, the emission standard of phosphorus and nitrogen has been strengthened recently as a substance causing eutrophication.
Chemical treatment method of coagulation sedimentation removal by administering coagulant such as metal salt to remove phosphorus is relatively used because of its high removal efficiency, and the treatment method by metal salt of aluminum salt and iron salt is most used as coagulant in sewage water treatment process. It is becoming.
1. Aluminum compound
Al 3 + + PO 4 3 - → AlPO 4 ↓
Al 2 (SO 4 ) 3 , NaAlO 2 or PAC (Poly Aluminum Chlroride) are widely used as flocculants because Al 3 + in the dissolved state reacts with OH - to form precipitates of Al (HO) 3 such as hydroxo complex. do. In an aqueous solution aluminum as Al + 3, but according to the pH of the solution was Al (OH) 2+, Al ( OH) 4 - , because of a variety of forms, such as, Al2 (HO) 2 4 + pH is an important variable. In addition, some of the phosphorus is AlPO 4 In addition, it is removed as a precipitate in the form of Aluminum Hydroxy-phosphate (Al x (OH) y (PO 4 ) z ).
2. Iron compound
Flocculants commonly used are FeCl 2, FeCl 3, and FeSO 4, Fe 2 (SO 4 ) and the iron compounds, such as 3, the ferrous salt is combined with phosphorus and the following reaction formula to form Fe 3+ and Fe 2 + FePO 4 , Fe 3 (PO 4 ) 2 forms a precipitate to remove phosphorus.
[Reaction Scheme]
Fe 3 + PO 4 3 - → FePO 4 ↓
3Fe 2 + 2PO 4 3 - → Fe 3 (PO 4) 2 ↓
Fe 3 + , like Al 3 + , forms various Hydroxo Complex such as Fe (OH) 2+ , Fe (OH) 4- , Fe 2 (OH) 2 4- in aqueous solution, and Fe (OH) 3 as a precipitate. In addition, since Fe (OH) 2 , FeCO 3 , (Fex (OH) y (PO 4 ) z) and the like are formed, the role of the intermediate product cannot be ignored.
3. Calcium Compound
Calcium ion reacts with phosphorus to form various calcium phosphate precipitates as follows, but the most important in terms of solubility is hydroxy apatite.
Ca 2 + HPO 4 2 → CaHPO 4
Ca 2 + 2H 2 PO 4 - → Ca (
Ca 2 + 2PO 4 2 → Ca 3 (PO 4 ) 2
5Ca 2 + 3PO 4 3 - → Ca 5 (PO 4) 3 OH
As described above, the chemical treatment method of phosphorus removal is a flocculation sedimentation method using Al, Fe, flocculant.
On the other hand, in the sewage, there are soluble phosphorous in the form of polyphosphorus and organic phosphorus.
First, soluble (PO 4 3- ) is dissolved in most of the raw water (ortho-phosphate). Phosphorus in poly form accounts for 30% of the sewage and is dissolved in considerable amounts, mainly due to synthetic detergents. Organic phosphorus also accounts for about 10-15% of the total phosphorus.
As shown in FIG. 1, removal of ortho-P decreases as the basicity increases, whereas as shown in FIG. 2, removal of particulate phosphorus is advantageous as the basicity increases.
Through the above results, it can be seen that even with the same drug, the removal rate varies depending on the form of phosphorus.
Stable forms of phosphorus include apatite (Ca 5 (F, Cl, OH) (PO 4 ) 3 ), monazite ((LaCe) (PO 4 )), triprite (LiFePO 4 ), lithiophylliteLiMnPO 4 , Lenzite (Fe (PO 4 ) (H 2 O) 2 ), Bivianite (Fe 3 (PO) 4 .8H 2 O), etc., and the phosphorus present in the wastewater and sewage in the same form as above, Precipitates.
In order to solve the problems of the prior art as described above, an object of the present invention is to provide a method for producing a phosphorus remover that can significantly improve the phosphorus removal efficiency of the existing flocculant.
In addition, an object of the present invention is to provide a method for producing an economical phosphorus remover can easily remove the total phosphorus contained in the sewage and wastewater even with a small amount.
In order to achieve the above object, the present invention
(S1) mixing aluminum sulfate into poly aluminum chloride;
(S2) adding a lanthanum compound to the mixture to mix; And
(S3) adding a calcium compound to the mixture and stirring for 30 to 60 minutes;
It provides a method for producing a phosphorus remover comprising a.
Particularly, in the step (S1), aluminum sulfate having Al 2 O 3 of 7 to 8 is added to poly aluminum chloride having Al 2 O 3 of 12 to 15%, and the aluminum sulfate is 1 to 15 weight compared to the polyaluminum chloride content. It is preferable to add in%.
The lanthanum compound may use lanthanum chloride or lanthanum oxide solution, and the calcium compound may use calcium chloride or calcium chloride solution.
In addition, the present invention is a compound prepared by the above method represented by the following formula (1), Al 2 O 3 of the compound is 10 to 12%, the basicity is 35 to 40% ( based on the basicity of the phosphorus remover prepared in Example It is listed in the same range, please check) Phosphorus phosphorus remover is provided.
[Formula 1]
Al a (OH) b (Cl) c (Ca) d (La) e (SO 4 ) f
Phosphorus removal agent prepared according to the present invention can significantly improve the phosphorus removal efficiency of the existing flocculant, it is economical because it can easily remove the total phosphorus contained in the sewage and wastewater even with a small amount.
1 is a graph showing the removal of ortho-P with increasing basicity.
2 is a graph showing the removal of particulate phosphorus with increasing basicity.
Figure 3 is a graph showing the phosphorus removal rate after the addition of phosphorus remover and AS, PAC prepared in accordance with an embodiment of the present invention (20ppm) in the waste water.
Figure 4 is a graph showing the phosphorus removal rate after the addition of phosphorus remover and AS, PAC prepared in accordance with an embodiment of the present invention (50ppm) in the waste water.
Figure 5 is a graph showing the phosphorus removal rate after the addition of phosphorus remover and AS, PAC prepared in accordance with an embodiment of the present invention (100ppm) in the wastewater.
Hereinafter, the present invention will be described in detail.
The present invention improves the efficiency of the conventional phosphorus remover by adding La and Ca to poly aluminum chloride and aluminum sulfate, which are existing Al flocculants, to increase the efficiency of the phosphorus remover by chemical treatment. It was intended to improve significantly.
The phosphorus remover of the present invention may be prepared by adding aluminum sulfate to polyaluminum chloride to mix, adding and mixing a lanthanum compound to the mixture, and adding a calcium compound to the mixture and stirring for 30 to 60 minutes. have.
Referring to the method for producing a phosphorus remover of the present invention in detail.
First, aluminum sulfate is added to poly aluminum chloride and mixed.
The polyaluminum chloride and aluminum sulfate may be used that is commonly used in the art.
Unlike mono aluminum ions, the polyaluminum ions react with polyanions such as SO 4 2- , CrO 4 2- , C 2 O 4 2- , and PO 4 3- to form poorly soluble basic polynuclear complexes. . Therefore, the polyaluminum chloride and aluminum sulfate must be mixed at an appropriate loading ratio in consideration of the fact that SO 4 2 - and polyaluminum chloride of aluminum sulfate meet to form a poorly water-soluble basic multinuclear complex.
That is, the poly aluminum chloride and aluminum sulfate Al 2 O 3 is 12-15% poly but the aluminum chloride Al 2 O 3 is added to the aluminum sulfate 7-8%, and the aluminum sulphate is first compared to the poly aluminum chloride content It is preferable to add at 15 wt%.
After mixing polyaluminum chloride and aluminum sulfate as mentioned above, a lanthanum compound is added and mixed.
As the lanthanum compound, lanthanum chloride or lanthanum oxide aqueous solution may be used.
The amount of the lanthanum compound may vary depending on the kind used. The lanthanum compound is preferably included in an amount of 0.1 to 10% by weight, more preferably 0.1 to 5% by weight relative to the polyaluminum chloride content. If the content is less than 0.1% by weight, the flocculation sedimentation does not occur between the lanthanum compound and PO 4, and when the content is more than 10% by weight, excessive precipitation may interfere with the chemical precipitation reaction or deteriorate the stability of the phosphorus remover. .
In particular, when lanthanum chloride is used as the lanthanum compound, the amount of the lanthanum chloride is preferably added in an amount of 0.1 to 5% by weight, and in the case of using an lanthanum oxide solution, it is preferable to be added in an amount of 1 to 5% by weight.
After the lanthanum compound is added as described above, the calcium compound is added.
The calcium compound may be used calcium chloride or calcium chloride aqueous solution.
The calcium compound may vary depending on the type or calcium chloride concentration used. The calcium compound is preferably contained in an amount of 0.1 to 10% by weight, more preferably 0.2 to 5% by weight relative to the polyaluminum chloride content. If the content is less than 0.1% by weight, the calcium compound may not have an effect on the chemical precipitation and removal of suspended solids of phosphorus. If the content is more than 10% by weight, the excess of Ca ions may be combined with Al and P to form Al x Ca. By forming y (PO 4 ) (OH) 3x + 2S y -3 , the compound slows down the ortho-P precipitation rate and increases the dosage of flocculant.
In particular, when calcium chloride is used as the calcium compound, the amount of the calcium chloride is preferably added in an amount of 0.2 to 1% by weight, and in the case of using an aqueous calcium chloride solution, it is preferable to be added in an amount of 0.5 to 5% by weight.
After the calcium compound is added as described above, the final phosphorus remover may be obtained by stirring for 30 to 60 minutes. At this time, the reaction is possible even at room temperature, thereby reducing the economic consumption of the heat source supply.
Phosphorus remover of the present invention prepared as described above is represented by the formula (1).
[Formula 1]
Al a (OH) b (Cl) c (Ca) d (La) e (SO 4 ) f
The removing agent of the formula (1) is an Al 2 O 3 10 ~ 12% of the compound, the basicity is 35-40%.
Hereinafter, the present invention will be described in more detail with reference to examples. These embodiments are for purposes of illustration only and are not intended to limit the scope of protection of the present invention.
Example One
1,000 g of polyaluminum chloride having Al 2 O 3 of 12 to 15% was put into the reactor, and 130 g of aluminum sulfate having 7% of Al 2 O 3 was slowly introduced into the reactor. At this time, the reaction temperature was to maintain the room temperature. Then, 50 g of lanthanum chloride solution was added and stirred, and 5 g of calcium chloride was added thereto, followed by stirring for 30 to 60 minutes to obtain 1,100 g of a phosphorus remover.
The obtained phosphorus remover had Al 2 O 3 of 10-11% and basicity of 40%.
Example 2
1,000 g of polyaluminum chloride having Al 2 O 3 of 12 to 15% was put into the reactor, and 130 g of aluminum sulfate having 7% of Al 2 O 3 was slowly introduced into the reactor. At this time, the reaction temperature was to maintain the room temperature. Then, 50 g of lanthanum oxide solution was added and stirred while adding 5 g of calcium chloride, followed by stirring for 30 to 60 minutes, to obtain 1,100 g of a phosphorus remover.
The obtained phosphorus remover had Al 2 O 3 of 10-11% and basicity of 35%.
Example 3
1,000 g of polyaluminum chloride having Al 2 O 3 of 12 to 15% was put into the reactor, and 130 g of aluminum sulfate having 7% of Al 2 O 3 was slowly introduced into the reactor. At this time, the reaction temperature was to maintain the room temperature. Then, 50 g of lanthanum chloride solution was added and stirred, 25 g of calcium chloride aqueous solution (20 g of calcium chloride, 80 g of water) was added thereto, followed by stirring for 30 to 60 minutes to obtain 1,100 g of a phosphorus remover.
The obtained phosphorus remover had Al 2 O 3 of 10-11% and basicity of 35%.
Example 4
1,000 g of polyaluminum chloride having Al 2 O 3 of 12 to 15% was put into the reactor, and 130 g of aluminum sulfate having 7% of Al 2 O 3 was slowly introduced into the reactor. At this time, the reaction temperature was to maintain the room temperature. Then, 50 g of lanthanum oxide solution was added, followed by stirring, 25 g of calcium chloride aqueous solution (20 g of calcium chloride, 80 g of water) was added thereto, followed by stirring for 30 to 60 minutes to obtain 1,100 g of a phosphorus remover.
The obtained phosphorus remover had Al 2 O 3 of 10-12% and basicity of 35%.
The phosphorus remover prepared in Example 1 was added to the wastewater by 20, 50 and 100 ppm, respectively, using AS and PAC, and the total phosphorus (TP) and phosphorus removal rates in the wastewater were shown in Table 1 and FIGS. 3 to 5. Shown in
At this time, the total phosphorus (T-P) in the wastewater before the phosphorus remover treatment was 11.3ppm at 20ppm, 5.5ppm at 50ppm, 16.5ppm at 100ppm.
As shown in Table 1 and FIGS. 3 to 5, the phosphorus remover of Example 1 prepared by adding a lanthanum compound and a calcium compound to aluminum sulfate in polyaluminum chloride according to the present invention, when 20 ppm was added to waste water, Compared with PAC, it was confirmed that phosphorus removal rate was much higher, and even when 50 ppm and 100 ppm were added, phosphorus removal rate was significantly higher than that of AS and PAC.
Through these results, it can be seen that according to the present invention can be prepared a phosphorus remover that can significantly improve the phosphorus removal efficiency compared to the conventional phosphorus remover.
Although the present invention has been described as the preferred embodiment mentioned above, it is possible to make various modifications or variations without departing from the spirit and scope of the invention. The appended claims also cover such modifications and variations as fall within the spirit of the invention.
Claims (5)
(S2) adding a lanthanum compound to the mixture to mix; And
(S3) adding a calcium compound to the mixture and stirring for 30 to 60 minutes;
Method of producing a phosphorus remover comprising a.
In the step (S1), aluminum sulfate having Al 2 O 3 of 7 to 8 is added to poly aluminum chloride having Al 2 O 3 of 12 to 15%, and the aluminum sulfate is 1 to 15% by weight relative to the content of polyaluminum chloride. Method for producing a phosphorus remover, characterized in that the input.
The lanthanum compound is a lanthanum chloride or lanthanum oxide aqueous solution, the content is a method for producing a phosphorus remover, characterized in that it comprises 0.1 to 10% by weight relative to the poly aluminum chloride content.
The calcium compound is a calcium chloride or a calcium chloride aqueous solution, the content of the method of producing a phosphorus remover, characterized in that it comprises 0.1 to 10% by weight relative to the content of poly aluminum chloride.
[Formula 1]
Al a (OH) b (Cl) c (Ca) d (La) e (SO 4 ) f
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1020100042379A KR20110122985A (en) | 2010-05-06 | 2010-05-06 | Producing method of phosphorus removal |
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| Application Number | Priority Date | Filing Date | Title |
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| KR1020100042379A KR20110122985A (en) | 2010-05-06 | 2010-05-06 | Producing method of phosphorus removal |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR102291774B1 (en) * | 2021-04-14 | 2021-08-24 | 미주엔비켐 주식회사 | Manufacturing method of polyaluminum chloride coagulant with a concentration of 17% aluminum oxide |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR102291774B1 (en) * | 2021-04-14 | 2021-08-24 | 미주엔비켐 주식회사 | Manufacturing method of polyaluminum chloride coagulant with a concentration of 17% aluminum oxide |
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