KR20140128717A - Waste water treatment agent for phosphorus removal andpreparation method thereof - Google Patents
Waste water treatment agent for phosphorus removal andpreparation method thereof Download PDFInfo
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- KR20140128717A KR20140128717A KR20130047497A KR20130047497A KR20140128717A KR 20140128717 A KR20140128717 A KR 20140128717A KR 20130047497 A KR20130047497 A KR 20130047497A KR 20130047497 A KR20130047497 A KR 20130047497A KR 20140128717 A KR20140128717 A KR 20140128717A
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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
- C02F1/58—Treatment of water, waste water, or sewage by removing specified dissolved compounds
Abstract
Description
The present invention relates to a wastewater treatment agent for phosphorus removal and a method for producing the same. More particularly, the present invention relates to a wastewater treatment agent for phosphorus removal which is capable of reducing the amount of sludge generated by mixing zeolite and other substances with calcium hydroxide, And a process for producing the same.
Since January 1, 1996, Korea has set limits on the total nitrogen and total phosphorus discharge of wastewater for areas such as specific lakes designated by the Minister of the Environment.
In general, phosphorus (P), which is well-known as the main cause of eutrophication, causes an explosive breeding of various microorganisms when excessively introduced into a lake, a river or the sea, so that dissolved oxygen in the water is rapidly exhausted, And eventually destruction of the aquatic ecosystem.
Biological methods and physicochemical methods have been used to remove phosphorus from sewage or wastewater containing such phosphorus.
Biological methods utilize the phenomenon that aerobic microorganisms can over-consume phosphorus, and methods such as A / O, A2 / O, Bardenpho, UCT (University of Cape Town) and the like are known. However, this method takes a long time to remove the phosphorus and requires a special facility, which causes a problem of a large cost burden.
In addition, the physico-chemical method uses a coagulation sedimentation method, which is advantageous over current biological methods because it does not require a separate facility and has a merit that it is removed in a relatively short time than a biological method. However, this method requires the use of a coagulant. The calcium hydroxide (Ca (OH) 2 ), which is commonly used as a coagulant, not only lowers the removal efficiency of phosphorus but also reduces the amount of sludge A problem of three times as much as the coagulant to be injected occurs. Further, a method of using zeolite as another coagulant in the above method is known. When such a zeolite is used, it has excellent adsorbability and shows a certain amount of phosphorus removal efficiency, but there is a problem of consuming a large amount of chemicals in increasing the degree of alkalinity .
Accordingly, techniques relating to a wastewater treatment agent to overcome the problems of conventional wastewater treatment agents have been studied, and examples thereof are as follows.
Korean Patent Registration No. 10-0464866 discloses a method for producing a purifying agent for use in the treatment of wastewater, manure, green tide, and red tide, more specifically, a method in which a coal fly ash or incinerator is subjected to alkali treatment at 90 to 180 캜, a) Peat mixed with marine sediments and plants with high contents were mixed and acid was added to the mixture to stir the mixture while heating at 90~100 ℃ while maintaining the pH at 2.0~2.5. (ORP) by injecting hydrogen peroxide (H 2 O 2 ) and ferrous sulfate (FeSO 4 ) at a ratio equivalent to the equivalent amount, and a humus soil containing a large amount of mineral salts (+ 300 ~ + 350mV) to produce activated humus soil containing a large amount of peroxyfulvic acid mineral complex and oxidase. · Wastewater treatment, manure In processing It is used as a cleaning agent or as a preventive and treating agent for green tide and red tide.
Korean Patent Registration No. 10-0373136 (Applicant: Sejung High Tech) (Prior Art 1) discloses a chemical treatment agent for removing nitrogen and phosphorus from wastewater and a method for treating wastewater using the same, more specifically, KMnO 4 2-6 weight 0.01 to 0.06% by weight of Ca (OH) 2 , 10 to 50% by weight of FeSO 4 , and the balance of water is stirred for 1.5 to 3 hours under anaerobic condition using a chemical treating agent composed of water; Adding a flocculant and an aggregating aid to the reacted (treated) wastewater to carry out solid-liquid separation; And treating the solid-liquid separated treated water with an aerobic suspension growth method, and a method for treating wastewater using the chemical treatment agent for removing nitrogen and phosphorus from wastewater.
Korean Patent Registration No. 10-0732230 of the present applicant discloses a wastewater treatment agent for phosphorus removal and a method for producing the wastewater treatment agent, more specifically, 5-20 parts by weight of magnesium carbonate relative to 100 parts by weight of zeolite, and calcium oxide and calcium hydroxide 40 to 60 parts by weight of a mixture, and a process for producing the same.
Despite these prior arts, there is no need for a separate facility, the consumption of chemicals for phosphorus removal is low, the wastewater for improved phosphorus removal, which maximizes the phosphorus removal effect in the wastewater in a comparatively short time and reduces the amount of sludge generated Development of processing agents is still required.
Disclosure of Invention Technical Problem [8] The present invention is to solve the problems of the conventional wastewater treatment apparatus for removing phosphorus, which requires no facility, consumes less chemicals for phosphorus removal, maximizes the phosphorus removal effect in the wastewater in a relatively short time, And an object of the present invention is to provide a wastewater treatment agent for improved phosphorus removal capable of reducing the amount of water generated and a method for producing the same.
In order to attain the above object, the present invention provides a process for producing a zeolite comprising 30 to 50 parts by weight of magnesium carbonate, 10 to 30 parts by weight of calcium hydroxide, 10 to 30 parts by weight of activated carbon and 10 to 30 parts by weight of calcium chloride, Thereby providing a wastewater treatment agent for removal.
The present invention also provides a method for producing a wastewater treatment agent for phosphorus removal,
100 parts by weight of zeolite containing silicon dioxide, alumina, magnesium oxide, calcium oxide, sodium oxide and iron oxide, 30 to 50 parts by weight of magnesium carbonate, 10 to 30 parts by weight of calcium hydroxide, 10 to 30 parts by weight of activated carbon, 30 parts by weight of water is added and the mixture is mixed at a temperature of 58 ° C to 65 ° C for 50 minutes to 70 minutes (Step 1);
Drying the mixture obtained in step 1 to solidify (step 2); And
And a step (step 3) of crushing the solidified mixture in the step 2.
The present invention can remove ammonia nitrogen, nitrite nitrogen and organic matter at the same time as it has high phosphorus treatment efficiency of 99.90% by using the wastewater treatment agent of the present invention.
Further, the present invention can remove heavy metals in wastewater using the wastewater treatment agent of the present invention, reduce the amount of generated sludge by about 40%, eliminate the need for a separate facility, The phosphorus removal effect in the wastewater can be maximized in a relatively short time.
Hereinafter, the present invention will be described in detail.
Prior to this, terms and words used in the present specification and claims should not be construed as limited to ordinary or dictionary terms, and the inventor should appropriately interpret the concepts of the terms appropriately It should be interpreted in accordance with the meaning and concept consistent with the technical idea of the present invention based on the principle that it can be defined.
Therefore, it should be understood that the embodiments described herein are merely the most preferred embodiments of the present invention and are not intended to represent all of the technical ideas of the present invention, so that various equivalents and modifications It should be understood.
One aspect of the present invention provides a waste water treatment agent for phosphorus removal comprising zeolite, magnesium carbonate, calcium hydroxide, activated carbon, and calcium chloride.
In the present invention, zeolite is included as one component constituting the wastewater treatment agent. The zeolite used in the present invention contains 81 weight% of silicon dioxide, 10 weight% of alumina, 1.5 weight% of magnesium oxide, 2.0 weight% of calcium oxide, 3.0 weight% of sodium oxide and 2.5 weight% of iron oxide, And selectively adsorbs nitrogen gas. In addition, Ca 2 + , Si 4 + , and Al 3 + among the constituent elements of the zeolite selectively adsorb phosphorus because the elemental component of zeolite chemically has an excellent cation exchange function.
On the other hand, the zeolite is a hydrated silicate mineral of aluminum which contains an alkaline earth metal such as alkali metal and calcium and has water in the form of crystal water, which is also referred to as "boiling stone". The P and Si of the zeolite are characterized in that they form a polymeric anion oxide well.
In addition, the characteristics of the zeolite have a high crystalline water content, a porous structure, a large specific surface area and a large cation exchange capacity (CEC). In addition, ammonia has a selective adsorption property, a water absorption ability, a gas adsorption ability and a hygroscopic property.
Other components constituting the wastewater treatment agent of the present invention include magnesium carbonate and calcium hydroxide. Magnesium carbonate and calcium hydroxide are materials having a high cation exchange capacity (CEC). In the present invention, when 30 to 50 parts by weight of magnesium carbonate and 10 to 30 parts by weight of calcium carbonate are mixed with 100 parts by weight of zeolite, the phosphorus removal effect is 99.90% And the amount of sludge generated is also reduced. Preferably, the magnesium carbonate is used in an amount of 35 to 45 parts by weight, more preferably 40 parts by weight, per 100 parts by weight of the zeolite, and the calcium hydroxide is used in an amount of 15 to 25 parts by weight, Can be used. When both magnesium carbonate and potassium hydroxide are used out of the above range, the phosphorus removal efficiency is low and it is difficult to obtain the action and effect of the present invention.
In the following, the principle of removing phosphorus from the mixture of zeolite, magnesium carbonate and calcium hydroxide in the removal of phosphorus in the waste water of the present invention is as follows.
The removal of the total phosphorus in the waste water of the present invention uses a cation exchange adsorption process which is a physicochemical treatment. The cation exchange adsorption process treats the pollutants using the principle of coagulating and removing the phosphorus component by applying an electric charge to the phosphorus component.
More specifically, phosphorus (P) among the typical elements of the periodic table is excellent in adsorbability with alkali metals and alkaline earth metals. Therefore, in the removal of phosphorus, PO 4 3 - is a substance charged with an anion component, so it is removed by bonding with alkali metal (1A), alkaline earth metal (2A) and a substance having strong cation exchange function of the 3B group system.
Therefore, by adding Ca 2 + , Mg 2 +, or the like, which is an alkaline earth metal among the components of magnesium carbonate and calcium hydroxide to the zeolite component, the removal efficiency of the total phosphorus in the wastewater can be improved.
On the other hand, the removal of the total phosphorus in the wastewater by using calcium hydroxide as the existing calcium hydroxide is not only inefficient, but also has a problem that the amount of sludge generated in the wastewater is about three times the amount of calcium hydroxide. In addition, when phosphorus is removed by using only zeolite, phosphorus adsorption is excellent and there is a certain amount of phosphorus removal efficiency. However, there is a problem that the amount of chemicals consumed increases with increasing alkalinity.
In order to solve the problem of the efficiency reduction and the sludge discharge amount and the problem of using a large amount of zeolite in order to increase the alkalinity in the phosphorus removal using the existing slaked lime, a waste water treatment agent containing zeolite, magnesium carbonate, Developed.
At this time, Ca 2 + , Al 3 + , and Si 4 + ions having high cation exchange ability of zeolite are included in the additional components. In addition, phosphorus can be efficiently removed while reducing the amount of sludge generated by Ca 2+ ions in Mg 2 + ions and calcium hydroxide in magnesium carbonate.
Therefore, the ammonia nitrogen can be removed by the components of the zeolite, and phosphorus can be removed by the reaction of the wastewater treating agent of the present invention, and heavy metals can be further removed.
In addition, the present invention further includes activated carbon and calcium chloride as another component constituting the wastewater treatment agent of the present invention.
Activated carbon is a component which is excellent in the effect of aggregating fine particles as an adsorbent. More specifically, the present invention is a component used for improving the decomposition reaction efficiency by agglomerating chemically fine particles. In the present invention, any activated carbon available in the art can be used, and the kind thereof is not particularly limited, and for example, a powder activated carbon may be used. The particle size of the activated carbon used may be 100 mesh or more, and the particle size of the activated carbon may be variously adjusted by a person skilled in the art depending on the use conditions.
Also, calcium chloride is a component that acts to decompose and evaporate phosphate in the slurry by reacting phosphate and calcium, and is a component used to exhibit the effect of decomposing sludge to reduce sludge. In the present invention, they can be used in the form of liquid or solid, preferably in the form of liquid. When used in a liquid phase, it can be used at a concentration of about 70%, which is not particularly limited in the art.
Both the activated carbon and the calcium chloride used may be used in an amount of 15 to 25 parts by weight, more preferably 20 parts by weight, based on 100 parts by weight of the zeolite, and may be used in the same or different amounts within the above ranges. When both the activated carbon and the calcium hydroxide are used out of the above range, the sludge reduction rate is low and it is difficult to obtain the action and effect of the present invention.
When 10 liters of wastewater for removal of solid phosphorus was treated with 100 liters (L) of wastewater with a phosphorus concentration of 615.32 mg / l, about 2 kg of sludge was generated and the treated water was about 80 liters. The phosphorus concentration of the treated water was 0.691 mg / l.
On the other hand, when 10 kg of the phosphorus removal wastewater according to the present invention was applied to the same concentration and the same amount of raw water as the raw water, the treated water was about 88 liters and the phosphorus concentration of the treated water was 0.691 mg / l. The sludge was reduced by about 40% at 1.2 kg.
The reason for such a decrease in sludge is that the activated carbon contained in the wastewater treatment agent of the present invention adsorbs fine particles to improve decomposition reaction efficiency and functions to decompose and evaporate phosphates in the sludge by reacting calcium phosphate with calcium phosphate, As shown in FIG. For this reason, sludge is eventually reduced. That is, by using calcium chloride, the phosphate in the sludge reacts with calcium and can easily evaporate into the air. That is, it can be seen that the wastewater treatment agent of the present invention is a main factor of the sludge loss due to the excellent adsorption power of the activated carbon and the squeezing of the sludge solids due to the cohesive force of the calcium chloride.
As described above, the wastewater treating agent for phosphorus removal of the present invention can have high phosphorus treatment efficiency of 99.90%, and can simultaneously remove ammonia nitrogen, nitrite nitrogen and organic matter. In addition, it is possible to remove the heavy metals in the wastewater by using the wastewater treatment agent of the present invention, to reduce the amount of generated sludge by about 40%, to eliminate the need for a separate facility, to consume less chemicals, It is possible to maximize the phosphorus removal effect in the wastewater.
Further, when the total amount of wastewater treatment agent of Korean Patent No. 10-0732230 is 10 kg as compared with the conventional wastewater treatment agent for phosphorus removal described in Korean Patent No. 10-0732230, for example, The zeolite accounts for about 6.7 kg. However, in the present invention, calcium chloride is used in place of the calcium oxide contained in the conventional wastewater treatment agent, and activated carbon is used in addition to activating the reaction for phosphorus removal, so that the total amount of zeolite used can be reduced to 5 kg, (A reduction in the amount of zeolite of about 25%), the amount of sludge originating from the zeolite can be reduced by using liquid calcium chloride in the wastewater treatment agent of the present invention instead of using powdery calcium oxide in the conventional wastewater treatment agent.
According to another aspect of the present invention, there is provided a method for producing a wastewater treatment agent for phosphorus removal according to the present invention,
100 parts by weight of zeolite containing silicon dioxide, alumina, magnesium oxide, calcium oxide, sodium oxide and iron oxide, 30 to 50 parts by weight of magnesium carbonate, 10 to 30 parts by weight of calcium hydroxide, 10 to 30 parts by weight of activated carbon, 30 parts by weight of water is added and the mixture is mixed at a temperature of 58 ° C to 65 ° C for 50 minutes to 70 minutes (Step 1);
Drying the mixture obtained in step 1 to solidify (step 2); And
And a step (step 3) of crushing the solidified mixture in the step 2.
Each component and component ratio and apparatus used in the above method of manufacture may be those described above and readily available in the art and are not specifically recited in this section.
In step 2, the reaction temperature is limited to 58 ° C to 65 ° C. If the reaction temperature is lower than 58 ° C, there may be a problem in solidifying the mixture obtained in step 1 above. If it exceeds 65 ° C, There may be a problem in mixing the mixture. Also, parts by weight of these components are the most preferred weight range with optimal phosphorus removal efficiency in wastewater.
Hereinafter, the present invention will be described in detail with reference to Examples, Experimental Examples and Production Examples.
However, the following Examples, Experimental Examples and Preparation Examples are merely illustrative of the present invention, and the contents of the present invention are not limited by Examples, Experimental Examples and Production Examples.
< Example 1> Preparation of wastewater treatment agent for phosphorus removal of the present invention 1
5 g of a zeolite containing 81% by weight of silicon dioxide, 10% by weight of alumina, 1.5% by weight of magnesium oxide, 2.0% by weight of calcium oxide, 3.0% by weight of sodium oxide and 2.5% by weight of iron oxide and 5 g of magnesium carbonate (100% 1 g of activated carbon (4 x 8 mesh, trade name DDCC, trade name of Kaya Activated Carbon Co., Ltd.) and 1 g of calcium chloride (liquid phase, 74%, manufactured by Seishi Kogyo Co., Ltd.) Water was added to 1 g of the mixture and mixed at a temperature of 60 캜 for 1 hour.
< Example 2 > Preparation of wastewater treatment agent for phosphorus removal of the present invention 2
Water was added to a mixture of 5 g of zeolite, 1.5 g of magnesium carbonate, 1 g of calcium hydroxide, 1 g of activated carbon and 1 g of calcium chloride, and the mixture was stirred at a temperature of 60 DEG C for 1 hour.
< Comparative Example 1>
Water was added to 5 g of zeolite and 5 g of magnesium carbonate and mixed under the same conditions as in Example 1.
< Comparative Example 2>
Water was added to a mixture of 5 g of zeolite, 2 g of magnesium carbonate, and 1 g of calcium hydroxide, and the mixture was mixed under the same conditions as in Example 1.
< Comparative Example 3>
Water was added to a mixture of 5 g of zeolite, 2 g of magnesium carbonate, and 1 g of calcium chloride, and the mixture was mixed under the same conditions as in Example 1.
< Experimental Example > Review the removal effect
50 ml of the sample obtained by crushing the solidified mixture with a crusher was placed in a syringe bottle and mixed with 10 ml of 4% potassium persulfate solution, and the mixture was put into a high-pressure steam sterilizer And heated from 120 占 폚 for 30 minutes. Next, the spray bottle was taken out and allowed to cool. Precisely 25 ml of the supernatant of the pretreated sample as described above was accurately taken out, transferred to a stoppered color tube, and 2 ml of ammonium molybdate · ascorbic acid mixed solution was added thereto and shaken. Then, after standing at 20-40 ° C for 15 minutes, the absorbance was measured to determine the total phosphorus concentration. Therefore, the phosphorus concentration in the raw water and the phosphorus concentration of the treated water were measured and compared, and the phosphorus removal efficiency was evaluated.
Zeolite, magnesium carbonate, calcium hydroxide, activated carbon and calcium chloride was excluded, the total phosphorus removal efficiency in the wastewater was lowered. Accordingly, the present invention has a high phosphorus treatment efficiency of 99.92% by simultaneously using the above three ingredients, and has been effective in removing heavy metals as well as ammonia nitrogen, nitrite nitrogen and organic matter.
In addition, when 10 kg of the conventional solid phosphorus treating agent was treated with 100 liters (L) of wastewater having a phosphorus concentration of 615.32 mg / l, about 2 kg of sludge was generated and the treated water was about 80 liters, Was 0.691 mg / l.
On the other hand, when 10 kg of the phosphorus removal wastewater according to the present invention was applied to the same concentration and the same amount of raw water, the treated water was about 88 liters and the phosphorus concentration of the treated water was 0.691 mg / l. The sludge was reduced by about 40% at 1.2 kg.
As described above, in the wastewater treatment agent for phosphorus removal according to the present invention and the method for producing the same, it is possible to have a high phosphorus treatment efficiency of 99.92% using ammonia nitrogen, nitrite nitrogen, Organic materials can be simultaneously removed.
In addition, it is possible to remove the heavy metals in the wastewater by using the wastewater treatment agent of the present invention, to reduce the amount of generated sludge by about 40%, to eliminate the need for a separate facility, to consume less chemicals, It is possible to maximize the phosphorus removal effect in the wastewater.
Claims (7)
A waste water treatment agent comprising 30 to 50 parts by weight of magnesium carbonate, 10 to 30 parts by weight of calcium hydroxide, 10 to 30 parts by weight of activated carbon, and 10 to 30 parts by weight of calcium chloride, based on 100 parts by weight of zeolite.
100 parts by weight of zeolite containing silicon dioxide, alumina, magnesium oxide, calcium oxide, sodium oxide and iron oxide, 30 to 50 parts by weight of magnesium carbonate, 10 to 30 parts by weight of calcium hydroxide, 10 to 30 parts by weight of activated carbon, 30 parts by weight of water is added and the mixture is mixed at a temperature of 58 ° C to 65 ° C for 50 minutes to 70 minutes (Step 1);
Drying the mixture obtained in step 1 to solidify (step 2); And
And a step (3) of crushing the solidified mixture in the step (2).
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| KR20130047497A KR20140128717A (en) | 2013-04-29 | 2013-04-29 | Waste water treatment agent for phosphorus removal andpreparation method thereof |
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| KR20130047497A KR20140128717A (en) | 2013-04-29 | 2013-04-29 | Waste water treatment agent for phosphorus removal andpreparation method thereof |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20170077846A (en) * | 2015-12-28 | 2017-07-06 | (주)송웅피엔텍 | Material for water treatment, and method of fabricating the same |
| CN107758774A (en) * | 2017-11-30 | 2018-03-06 | 李长沛 | The preparation method of waste water treating agent |
| KR101842094B1 (en) * | 2017-12-22 | 2018-03-26 | 삼구화학공업 주식회사 | Cohesive agent and pH adjustment agent comprising sodium aluminum silicate for water-treatment |
-
2013
- 2013-04-29 KR KR20130047497A patent/KR20140128717A/en not_active Application Discontinuation
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20170077846A (en) * | 2015-12-28 | 2017-07-06 | (주)송웅피엔텍 | Material for water treatment, and method of fabricating the same |
| CN107758774A (en) * | 2017-11-30 | 2018-03-06 | 李长沛 | The preparation method of waste water treating agent |
| KR101842094B1 (en) * | 2017-12-22 | 2018-03-26 | 삼구화학공업 주식회사 | Cohesive agent and pH adjustment agent comprising sodium aluminum silicate for water-treatment |
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