KR100245196B1 - Highly prepolymerized polyaluminium chlorides and their production methods for use as coagulant in water treatment - Google Patents

Highly prepolymerized polyaluminium chlorides and their production methods for use as coagulant in water treatment Download PDF

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KR100245196B1
KR100245196B1 KR1019970068467A KR19970068467A KR100245196B1 KR 100245196 B1 KR100245196 B1 KR 100245196B1 KR 1019970068467 A KR1019970068467 A KR 1019970068467A KR 19970068467 A KR19970068467 A KR 19970068467A KR 100245196 B1 KR100245196 B1 KR 100245196B1
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water treatment
flocculant
coagulant
present
aluminum chloride
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KR19990049511A (en
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곽종운
김용태
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오덕춘
주식회사워테크
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    • CCHEMISTRY; METALLURGY
    • C01INORGANIC CHEMISTRY
    • C01FCOMPOUNDS OF THE METALS BERYLLIUM, MAGNESIUM, ALUMINIUM, CALCIUM, STRONTIUM, BARIUM, RADIUM, THORIUM, OR OF THE RARE-EARTH METALS
    • C01F7/00Compounds of aluminium
    • C01F7/48Halides, with or without other cations besides aluminium
    • C01F7/56Chlorides
    • CCHEMISTRY; METALLURGY
    • C01INORGANIC CHEMISTRY
    • C01FCOMPOUNDS OF THE METALS BERYLLIUM, MAGNESIUM, ALUMINIUM, CALCIUM, STRONTIUM, BARIUM, RADIUM, THORIUM, OR OF THE RARE-EARTH METALS
    • C01F7/00Compounds of aluminium
    • C01F7/78Compounds containing aluminium and two or more other elements, with the exception of oxygen and hydrogen
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00Treatment of water, waste water, or sewage
    • C02F1/52Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities

Abstract

본 발명은 다음 일반식(Ⅰ)의 고염기도 수처리용 응집제와 그의 제조방법 및 다음 일반식(Ⅰ)의 고염기도 수처리용 응집제를 함유하는 수처리용 응집제 조성물에 관한 것이다.The present invention relates to a coagulant for water treatment of the following general formula (I), a manufacturing method thereof, and a coagulant composition for water treatment containing the coagulant for water treatment of the high base of the following general formula (I).

[AlMa(OH)bClc] …… (Ⅰ)[AlM a (OH) b Cl c ]... … (Ⅰ)

여기에서 M은 Na, Ca, Mg 중 어느하나이며 a는 그 금속의 몰수를 나타내는 수이고 a, b, c는 각각 다음 범위를 만족시키는 것이다.Where M is any one of Na, Ca, and Mg, a is a number representing the number of moles of the metal, and a, b, and c each satisfy the following ranges.

3+a=b+c, 0≤a≤1.5, 0.5≤b≤2.5, 0.5≤c≤2.53 + a = b + c, 0≤a≤1.5, 0.5≤b≤2.5, 0.5≤c≤2.5

본 발명의 고염기도 폴리염화알루미늄 수처리용 응집제는 기존의 폴리염화 알루미늄 계열 응집제의 응집성능을 크게 개선시킨 것으로 정수장에서의 처리탁도의 향상 및 경제성에 있어서 큰 이점이 있다. 첫째, 수질변동시에 여러 가지 응집제를 사용하여야 하는 현재의 방법 대신 본 발명품을 사용할 경우 안정적으로 우수한 수질을 유지할 수 있으며 둘째, 현재 사용하고 있는 응집제들의 경우 적정 투입량 구간이 좁은 관계로 적정 투입량을 정확히 예측하지 못할 경우 처리수질이 매우 악화될 수 있는 문제점을 가지고 있는데 비하여 본 발명품의 경우 적정 투입량 구간이 매우 넓으므로 이러한 어려움을 해결할 수 있고 셋째, 기존의 응집제들에 비하여 적은 투입량으로도 우수한 정수능력을 나타내므로 경제적인 면에서도 매우 유리하다.The coagulant for the water treatment of the polybasic aluminum chloride of the present invention greatly improves the cohesive performance of the existing polyaluminum chloride-based coagulant, and has a great advantage in improving the turbidity of treatment and economical efficiency in a water purification plant. First, if the present invention is used instead of the current method that requires the use of various flocculants in fluctuations in water quality, it is possible to maintain excellent water quality stably. If it is not predicted, there is a problem that the treated water quality may deteriorate very much. However, in the case of the present invention, since the proper dosage range is very wide, this difficulty can be solved. It is very advantageous economically.

Description

고중합 염화알루미늄 수처리용 응집제 및 그의 제조방법Coagulant for High Polymerization Aluminum Chloride Water Treatment and Manufacturing Method Thereof

본 발명은 수처리용 응집제인 폴리염화알루미늄의 응집성능을 향상시켜주기 위하여 염기도(鹽基度)를 높인 고염기도의 수처리용 응집제 및 그의 제조방법에 관한 것이다. 현재 상하수도 정수장에서 응집제(Coagulant)로 사용하고 있는 황산알루미늄, 폴리염화알루미늄, 폴리염화규산알루미늄 등은 수질의 성질에 따라서 처리성능이 일정하지 못하여 수질변동시 안정적인 수질을 유지하는데 어려움을 겪고 있다. 본 발명의 목적은 원수성질에 크게 영향을 받지 않고 우수한 처리성능을 안정적으로 나타낼 수 있는 수처리용 응집제를 제공하는데 있다. 또한 폴리염화알루미늄에 탄산나트륨 및 중탄산나트륨 등의 탄산염을 첨가제로 투입하여 폴리염화알루미늄에 비하여 매우 우수한 응집성능을 가지는 수처리제를 제조하는 방법을 제공하는데 있다.BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a water treatment coagulant having a high basicity and a method for producing the same, in order to improve the cohesive performance of polyaluminum chloride, which is a water treatment flocculant. Aluminum sulfate, polyaluminum chloride, and polyaluminum silicate, which are currently used as coagulants in water supply and sewage treatment plants, have difficulty in maintaining stable water quality when water quality fluctuates due to inconsistent treatment performance. An object of the present invention is to provide a flocculant for water treatment that can stably exhibit excellent treatment performance without being significantly affected by raw water quality. In addition, the present invention provides a method of preparing a water treatment agent having a very good cohesive performance compared to polyaluminum chloride by adding carbonates such as sodium carbonate and sodium bicarbonate to the polyaluminum chloride as an additive.

그 밖에도 본 발명의 고염기도 수처리용 응집제를 함유하는 수처리용 응집제 조성물을 제공하기 위한 것이기도 하다.In addition, the high base of the present invention also provides a flocculant composition for water treatment containing a flocculant for water treatment.

현재 수처리용 응집제로서 황산알루미늄(Aluminium sulfate : 이하 Alum이라 한다), 폴리염화알루미늄(Poly Aluminium Chloride : 이하 PAC라 한다), 폴리염화규산알루미늄(Poly Aluminium Chloride Silicate : 이하 PACS라 한다) 등을 널리 사용하고 있다. Alum은 응집제의 알루미늄 이온이 단분자 형태인 Al3+로 존재하고 있으나 나머지 응집제들은 알루미늄 이온간의 중합을 통하여 고분자 형태를 형성하고 있다. 알루미늄 응집제의 응집성능은 알루미늄 이온의 전하량에 크게 의존한다. 이론적인 응집성능 계산식으로 널리 알려진 슐츠-하디(Schultz-Hardy) 법칙에 따르면 알루미늄 이온의 전하중화 능력은 전하량의 7제곱에 비례한다. 따라서 응집제의 알루미늄 이온의 전하량을 높이는 것은 응집제 제조 기술에 있어서 가장 핵심적인 부분이라고 할 수 있다. PAC, PACS 등의 응집제들은 전하량을 높이기 위하여 제조된 응집제들로서 가장 많이 사용되고 있는 응집제이기는 하지만 이론적으로 최고의 응집성능을 나타내는 응집제의 염기도는 약 70%인데 비하여 상기 응집제들의 염기도는 40∼45% 정도만을 나타내고 있어 만족스러운 응집제라고 볼 수는 없다.Currently, aluminum sulfate (hereinafter referred to as Alum), polyaluminum chloride (hereinafter referred to as PAC), polyaluminium chloride (PAC), etc. are widely used as flocculants for water treatment. Doing. Alum exists as Al 3+ in which the aluminum ion of the flocculant is a monomolecular form, but the other flocculants form a polymer form through polymerization between aluminum ions. The flocculation performance of the aluminum flocculant largely depends on the charge amount of the aluminum ions. According to Schultz-Hardy's law, which is widely known as a theoretical cohesion formula, the charge neutralization ability of aluminum ions is proportional to the power of seven squares. Therefore, increasing the charge amount of the aluminum ion of the flocculant can be said to be the most essential part of the flocculant manufacturing technology. Although flocculants such as PAC and PACS are the most widely used flocculants to increase the amount of charge, the flocculant exhibiting the highest coagulability in theory has a basicity of about 70%, while the basicity of the flocculants is only about 40 to 45%. It is not a satisfactory coagulant.

국내에서도 고염기도 응집제를 제조하기 위한 많은 시도가 있었으나 아직까지 PAC 또는 PACS의 수준을 넘어서지 못하고 있다.In Korea, many attempts have been made to prepare a high base flocculant, but have not yet exceeded the level of PAC or PACS.

본발명에서 염기도의 정의는 다음식과 같이 나타낼수 있다,In the present invention, the definition of basicity can be expressed as follows.

염기도(%) = [OH수/(Al수×3)]×100% Basicity = [OH water / (Al water x 3)] x 100

기존의 PAC 계열의 응집제들의 제조방법은 수산화알루미늄에 염산을 반응시켜 제조하는 것으로 염산의 투입량이 늘어날수록 응집제의 염기도가 감소하게 된다. 염산의 투입량이 적은 경우 염기도는 증가하게 되나 물에 대한 알루미늄 이온의 용해도가 작아지게 되어 응집제로서의 성능이 매우 불안정해진다.Conventional methods for producing flocculants of the PAC series are prepared by reacting aluminum hydroxide with hydrochloric acid. As the amount of hydrochloric acid is increased, the basicity of the flocculant decreases. When the amount of hydrochloric acid is small, the basicity increases, but the solubility of aluminum ions in water decreases, so that the performance as a flocculant becomes very unstable.

본 발명에서는 염산의 투입으로 낮아진 염기도를 알칼리제를 투입하여 다시 염기도를 높이는 방법을 응용하였다. 본 발명에서 제조한 고염기도의 PAC(Highly polymerized Aluminium Chloride : 이하 HPAC라 한다)는 PAC에 알칼리를 첨가하여 제조한 것이다. 이와같은 방법을 사용하여 응집제의 염기도를 높인 결과 염기도가 최고 80%까지 올라가고 안정성에 문제가 없었으며 염기도를 높여줌에 따라 응집성능의 탁월한 향상을 이루었다.In the present invention, the basicity lowered by the addition of hydrochloric acid was added to the alkaline agent to increase the basicity again. PAC (Highly Polymerized Aluminum Chloride: hereinafter referred to as HPAC) of the high basic degree prepared in the present invention is prepared by adding alkali to PAC. As a result of increasing the basicity of the flocculant using this method, the basicity rose up to 80%, and there was no problem in stability.

제1도∼제4도는 원수의 성질별로 응집성능을 비교하기 위하여 본 발명 제품과 PAC의 성능을 비교하여 그 탁도를 나타낸 그래프이다.1 to 4 are graphs showing the turbidity by comparing the performance of the product of the present invention and PAC in order to compare the cohesive performance according to the properties of raw water.

본 발명은 다음 일반식(Ⅰ)의 고염기도 수처리용 응집제와 그의 제조방법 및 다음 일반식(Ⅰ)의 고염기도 수처리용 응집제를 함유하는 수처리용 응집제 조성물을 제공하는 것이다.The present invention provides a flocculant composition for water treatment comprising a coagulant for water treatment of the following general formula (I), a method for producing the coagulant thereof, and a coagulant for water treatment of the following general formula (I).

[AlMa(OH)bClc] …… (Ⅰ)[AlM a (OH) b Cl c ]... … (Ⅰ)

여기에서 M은 Na, Ca, Mg 중 어느하나이며 a는 그 금속의 몰수를 나타내는 수이고 a, b, c는 각각 다음 범위를 만족시키는 것이다.Where M is any one of Na, Ca, and Mg, a is a number representing the number of moles of the metal, and a, b, and c each satisfy the following ranges.

3+a=b+c, 0≤a≤1.5, 0.5≤b≤2.5, 0.5≤c≤2.53 + a = b + c, 0≤a≤1.5, 0.5≤b≤2.5, 0.5≤c≤2.5

본 발명제품의 화학적 조성Chemical Composition of the Invention

PAC와 Na2CO3, NaHCO3, Ca(HCO3)2또는 염기성탄산마그네슘(basic magnesium carbonate : [(MgCO3)4·Mg(OH)2·4H2O])을 후술하는 반응조건하에서 반응시켜 다음과 같은 일반식을 갖는 HPAC를 제조하였다.PAC and Na 2 CO 3 , NaHCO 3 , Ca (HCO 3 ) 2 or basic magnesium carbonate ([MgCO 3 4 .Mg (OH) 2 .4H 2 O]) under the reaction conditions described below. HPAC having the following general formula was prepared.

[AlMa(OH)bClc] …… (Ⅰ)[AlM a (OH) b Cl c ]... … (Ⅰ)

여기에서 M은 Na, Ca, Mg 중 어느하나이며 a는 그 금속의 몰수를 나타내는 수이고 a, b, c는 각각 다음 범위를 만족시키는 것이다.Where M is any one of Na, Ca, and Mg, a is a number representing the number of moles of the metal, and a, b, and c each satisfy the following ranges.

3+a=b+c, 0≤a≤1.5, 0.5≤b≤2.5, 0.5≤c≤2.53 + a = b + c, 0≤a≤1.5, 0.5≤b≤2.5, 0.5≤c≤2.5

본 발명에서는 PAC의 농도가 Al2O3중량을 기준으로하여 5∼20% 범위에서 고염기도 HPAC를 제조할 수 있었다. 제조한 HPAC의 알루미늄 함량은 5∼16%(Al2O3중량기준)일 때 우수한 응집성능을 나타내었다. 염기도가 70%인 경우 OH/Al의 몰비는 2.1로 표시된다.In the present invention, high concentration of HPAC was prepared in the range of 5 to 20% of PAC concentration based on Al 2 O 3 weight. The aluminum content of the prepared HPAC showed excellent cohesive performance at 5-16% (based on Al 2 O 3 weight). If the basicity is 70%, the molar ratio of OH / Al is expressed as 2.1.

본 발명제품의 일반 반응식은 다음과 같다.General reaction scheme of the present invention is as follows.

Al(OH)x(Cl)y+ MX → AlMa(OH)b(Cl)c Al (OH) x (Cl) y + MX → AlM a (OH) b (Cl) c

여기에서 MX는 Na2CO3, NaHCO3, Ca(HCO3)2또는 염기성탄산마그네슘(basic magnesium carbonate : [(MgCO3)4·Mg(OH)2·4H2O])이며, M은 Na, Ca, Mg 중 어느하나이며, X는 CO3, HCO3를 나타내며, a는 그 금속의 몰수를 나타내는 수이고 a, b, c는 각각 다음 범위를 만족시키는 것이다.Where MX is Na 2 CO 3, NaHCO 3, Ca (HCO 3) 2 or basic magnesium carbonate: and (basic magnesium carbonate [(MgCO 3 ) 4 · Mg (OH) 2 · 4H 2 O]), M is Na , Ca, Mg, X represents CO 3 , HCO 3 , a is a number representing the number of moles of the metal and a, b, c are each satisfy the following range.

3+a=b+c, 0≤a≤1.5, 0.5≤b≤2.5, 0.5≤c≤2.53 + a = b + c, 0≤a≤1.5, 0.5≤b≤2.5, 0.5≤c≤2.5

본 발명제품의 물리적 성질Physical Properties of the Invention

본 발명 수처리용 응집제의 물리적 성질은 다음과 같다.Physical properties of the flocculant for water treatment of the present invention are as follows.

·형상: 연한 노란색을 띠는 액체이며 이를 건조시키면 하얀 분말상태로 됨.Form: Light yellowish liquid which, when dried, becomes white powder.

·비중: 응집제의 알루미늄 함량 및 온도에 따라서 다르나 1.10∼1.35의 범위를 유지함.Specific gravity: Depending on the aluminum content and temperature of the flocculant, it is maintained in the range of 1.10 to 1.35.

·용해도: 물에 쉽게 용해함.Solubility: Easily soluble in water.

·끓는점: 100 kPa에서 100℃Boiling Point: 100 ° C at 100 kPa

·결정화점: 10% Al2O3제품의 경우 -20℃Crystallization point: -20 ℃ for 10% Al 2 O 3

본 발명 제품의 제조방법Manufacturing method of the product of the present invention

상기 HPAC의 제조방법은 다음과 같다. 먼저 수산화알루미늄을 염산과 혼합한 후 고온·고압에서 반응시켜 이 분야에서 이미 잘알려져 일반적으로 이용되고 있는 방법에 따라 폴리염화알루미늄 용액을 제조한 후 원하는 만큼의 염기도를 함유할 수 있도록 탄산나트륨과 같은 탄산염을 첨가한다.The manufacturing method of the HPAC is as follows. First, aluminum hydroxide is mixed with hydrochloric acid, and then reacted at a high temperature and high pressure to prepare a polyaluminum chloride solution according to a method already known and commonly used in this field, and then a carbonate such as sodium carbonate so as to contain as basicity as desired. Add.

일반적으로 산성용액 중에서 PAC를 안정화시켜 주기 위한 방법으로 유기고분자 응집제를 첨가하는 방법을 이용하고 있다. 본 발명의 응집제(HPAC)에서도 산성용액 중에서의 안정성 유지와 응집능력을 향상시키는 한 방법으로 폴리아크릴아마이드, 폴리디메틸디에틸암모늄클로라이드 등의 유기응집제를 0.01∼0.5wt% 정도 첨가하여 사용할 수도 있다.Generally, a method of adding an organic polymer flocculant is used as a method for stabilizing PAC in an acidic solution. In the flocculating agent (HPAC) of the present invention, an organic coagulant such as polyacrylamide and polydimethyldiethylammonium chloride may be added in an amount of 0.01 to 0.5 wt% as a method of maintaining stability in the acidic solution and improving the coagulation ability.

실시예 1.(응집제의 제조)Example 1 (Preparation of Coagulant)

분말상 수산화알루미늄 290g과 물 120g을 혼합하여 수산화알루미늄 슬러리를 제조한다. 상기 슬러리에 염산 590g을 첨가하면서 승온시킨다. 반응온도 150℃, 반응압력 4atm에서 약 3∼4시간 교반하면서 반응시킨다. 반응이 끝난 후 이를 여과하고 제조한 PAC 590g을 다음 반응을 위한 반응기로 옮기고 온도를 약 120℃ 정도로 올린다. 다음 탄산나트륨 슬러리(탄산나트륨 86g과 물 370g의 혼합물)를 PAC 용액에 천천히 투입한다. 투입시간은 1시간 이상으로 천천히 해야 하며, 투입이 끝난 후 약 2시간 정도 반응시킨다. 반응이 끝난 후 여과하여 이를 수처리용 응집제로 사용할 수 있다.290 g of powdered aluminum hydroxide and 120 g of water were mixed to prepare an aluminum hydroxide slurry. The slurry is heated while adding 590 g of hydrochloric acid. The reaction is stirred at a reaction temperature of 150 ° C. and a reaction pressure of 4 atm for about 3 to 4 hours. After the reaction, the resultant was filtered and 590 g of the prepared PAC was transferred to a reactor for the next reaction, and the temperature was raised to about 120 ° C. The sodium carbonate slurry (mixture of 86 g sodium carbonate and 370 g water) is then slowly added to the PAC solution. Dosing time should be slower than 1 hour, and react for about 2 hours. After the reaction is filtered, it can be used as a flocculant for water treatment.

분석결과 이 방법으로 제조한 응집제의 알루미늄 함량은 10%(Al2O3기준)이었으며, 화학적 조성은 다음과 같았다.As a result, the aluminum content of the flocculant prepared by this method was 10% (based on Al 2 O 3 ), and the chemical composition was as follows.

[AlNa0.8(OH)2.1Cl1.7]AlNa 0.8 (OH) 2.1 Cl 1.7

실시예 2.(응집제의 제조)Example 2 (Preparation of Coagulant)

폴리염화알루미늄의 제조방법은 위와 동일하다. PAC 590g을 반응기로 옮기고 온도를 약 120℃ 정도로 올린다. 여기에 염기성 탄산마그네슘 슬러리 95g과 물 380g을 천천히 투입한다. 투입시간은 1시간 이상으로 천천히 해야 하며, 투입이 끝난 후 약 2시간 정도 반응하도록 한다. 반응이 끝난 후 여과하여 이를 수처리용 응집제로 사용할 수 있다.The method for producing polyaluminum chloride is the same as above. Transfer 590 g of PAC to the reactor and raise the temperature to about 120 ° C. 95 g of basic magnesium carbonate slurry and 380 g of water are slowly added thereto. Dosing time should be slower than 1 hour, and react for about 2 hours after finishing. After the reaction is filtered, it can be used as a flocculant for water treatment.

분석결과 상기와 같이 제조한 응집제의 알루미늄 함량은 10%(Al2O3기준)이었으며, 화학적 조성은 다음과 같았다.As a result of analysis, the aluminum content of the coagulant prepared as described above was 10% (based on Al 2 O 3 ), and the chemical composition was as follows.

[AlMg0.5(OH)1.7Cl1.7][AlMg 0.5 (OH) 1.7 Cl 1.7 ]

실시예 3.(응집제의 성능평가)Example 3 (Evaluation of Coagulant)

다양한 원수조건에서 PAC와의 응집성능을 비교한 것으로 급속교반 400rpm 1분, 완속교반 50rpm 10분의 조건에서 응집시킨 후에 10분간 가라앉히고 상등액을 채취하여 탁도를 측정하였다. 응집성능 비교에 사용한 응집제는 기존의 PAC와 탄산나트륨, 염기성 탄산마그네슘을 첨가하여 제조한 HPAC이다.The flocculation performance was compared with PAC under various raw water conditions. After agitation at 400 rpm for 1 minute and slow stirring at 50 rpm for 10 minutes, the solution was allowed to settle for 10 minutes and the supernatant was collected to measure turbidity. The flocculant used in the comparison of the flocculation performance is HPAC prepared by adding existing PAC, sodium carbonate and basic magnesium carbonate.

첨부한 제 1도 내지 제4도는 원수의 성질에 따른 응집성능을 비교하기 위하여 본 발명제품(HPAC)와 PAC의 성능을 비교하여 그 탁도를 나타낸 그래프이다.1 to 4 are graphs showing the turbidity of comparing the performance of the present invention (HPAC) and PAC in order to compare the cohesive performance of the raw water.

제1도는 pH 7.2∼7.3, 알칼리도 40∼45mg/ℓ, 탁도 15.0 NTU(Number of Transter Unit)의 원수에 대하여 실시예 3의 방법에 따라 측정한 결과를 나타낸 비교 그래프이고,1 is a comparative graph showing the results measured according to the method of Example 3 for raw water of pH 7.2 to 7.3, alkalinity of 40 to 45 mg / L and turbidity of 15.0 NTU (Number of Transter Unit),

제2도는 pH 7.8∼7.9, 알칼리도 50∼60mg/ℓ, 탁도 12.6 NTU의 원수에 대한 비교 그래프이고,2 is a comparative graph of raw water with pH 7.8-7.9, alkalinity 50-60 mg / l, turbidity 12.6 NTU,

제3도는 pH 8.1∼8.2, 알칼리도 60∼65mg/ℓ, 탁도 9.2 NTU의 원수에 대한 비교 그래프이고,3 is a comparative graph of raw water of pH 8.1-8.2, alkalinity 60-65 mg / L, turbidity 9.2 NTU,

제4도는 pH 8.1∼8.2, 알칼리도 60∼65mg/ℓ, 탁도 9.2 NTU의 원수에 대한 비교 그래프이다.4 is a comparative graph of raw water of pH 8.1-8.2, alkalinity 60-65 mg / L, and turbidity 9.2 NTU.

제1도 및 제2도는 탄산나트륨을 첨가하여 제조한 다음 조성을 갖는 본 발명의 응집제를 사용하여 성능을 비교한 것이고1 and 2 compare the performance using the flocculant of the present invention having the following composition prepared by adding sodium carbonate

[AlNa0.8(OH)2.1Cl1.7]AlNa 0.8 (OH) 2.1 Cl 1.7

제3도 및 제4도는 염기성 탄산마그네슘을 첨가하여 제조한 다음 조성을 갖는 본 발명의 응집제를 사용하여 성능을 비교한 것이다.3 and 4 compare the performance using the flocculant of the present invention having the following composition prepared by adding basic magnesium carbonate.

[AlMg0.5(OH)2.3Cl1.7][AlMg 0.5 (OH) 2.3 Cl 1.7 ]

1. 탄산나트륨을 첨가하여 제조한 HPAC의 응집성능 평가실험1. Evaluation of Cohesive Performance of HPAC Prepared with Sodium Carbonate

실험에 사용한 응집제는 알루미늄 함량이 10%(as Al2O3), 염기도가 70%이며, 이의 화학적 조성은 다음과 같다.The flocculant used in the experiment was aluminum content of 10% (as Al 2 O 3 ), basicity of 70%, its chemical composition is as follows.

AlNa0.8(OH)2.1Cl1.7 AlNa 0.8 (OH) 2.1 Cl 1.7

상기의 응집성능 평가실험으로부터 본 발명 제품인 HPAC의 응집성능의 우수함을 확인하였으며, 특히 PAC보다 적은 투입량으로도 매우 우수한 처리결과를 나타냄을 알 수 있었다.It was confirmed that the cohesive performance of the HPAC product of the present invention was excellent from the coagulation performance evaluation experiment, and in particular, it shows that the treatment result was very excellent even with a small amount of input than the PAC.

본 발명의 HPAC는 기존의 PAC 계열의 응집제의 응집성능을 크게 개선시킨 것으로 정수장에서의 처리탁도의 향상 및 경제성에 있어서 큰 이점이 있다. 첫째, 수질변동시에 여러 가지 응집제를 사용하여야 하는 현재의 방법 대신 본 발명품을 사용할 경우 안정적으로 우수한 수질을 유지할 수 있으며 둘째, 현재 사용하고 있는 응집제들의 경우 적정투입량 구간이 좁은 관계로 적정 투입량을 정확히 예측하지 못할 경우 처리수질이 매우 악화될 수 있는 문제점을 가지고 있는데 비하여 본 발명품의 경우 적정 투입량 구간이 매우 넓으므로 이러한 어려움을 해결할 수 있고 셋째, 기존의 응집제들에 비하여 적은 투입량으로도 우수한 정수능력을 나타내므로 경제적인 면에서도 매우 유리하다.The HPAC of the present invention greatly improves the cohesive performance of the existing PAC-based flocculant, and has a great advantage in improving turbidity and economical efficiency in water treatment plants. First, it is possible to maintain stable water quality when the present invention is used instead of the current method that requires the use of various flocculants during water fluctuations. If it is not predicted, there is a problem that the treated water quality may deteriorate very much. However, in the case of the present invention, since the proper dosage range is very wide, this difficulty can be solved. It is very advantageous economically.

Claims (7)

하기 일반식(Ⅰ)로 표시되는 고중합 염화알루미늄 수처리용 응집제.A flocculant for high polymerization aluminum chloride water treatment represented by the following general formula (I). [AlMa(OH)bClc] …… (Ⅰ)[AlM a (OH) b Cl c ]... … (Ⅰ) 여기에서 M은 Na, Ca, Mg 중 어느하나이며 a는 그 금속의 몰수를 나타내는 수이고 a, b, c는 각각 다음 범위를 만족시키는 것이다.Where M is any one of Na, Ca, and Mg, a is a number representing the number of moles of the metal, and a, b, and c each satisfy the following ranges. 3+a=b+c, 0≤a≤1.5, 0.5≤b≤2.5, 0.5≤c≤2.53 + a = b + c, 0≤a≤1.5, 0.5≤b≤2.5, 0.5≤c≤2.5 제1항에 있어서, 알루미늄( Al2O3기준) 함량이 5∼15wt%이며, OH/Al 몰비가 1.0∼2.5인 응집제.The flocculant of claim 1 wherein the aluminum (based on Al 2 O 3 ) is 5-15 wt% and the OH / Al molar ratio is 1.0-2.5. 염화알루미늄계 수처리용 응집제의 제조방법에 있어서, 폴리염화알루미늄과 무기탄산염 슬러리를 혼합시킨 후 온도 90∼150℃, 압력 3∼6기압에서 액상 반응시켜 하기 일반식(Ⅰ)의 고중합 염화알루미늄을 제조하는 방법.In the manufacturing method of the flocculant for aluminum chloride-based water treatment, after mixing polyaluminum chloride and inorganic carbonate slurry, liquid phase reaction is carried out at a temperature of 90 to 150 ° C. and a pressure of 3 to 6 atm to give a high polymerization aluminum chloride of the general formula (I) How to manufacture. [AlMa(OH)bClc] …… (Ⅰ)[AlM a (OH) b Cl c ]... … (Ⅰ) 여기에서 M은 Na, Ca, Mg 중 어느하나이며 a는 그 금속의 몰수를 나타내는 수이고 a, b, c는 각각 다음 범위를 만족시키는 것이다.Where M is any one of Na, Ca, and Mg, a is a number representing the number of moles of the metal, and a, b, and c each satisfy the following ranges. 3+a=b+c, 0≤a≤1.5, 0.5≤b≤2.5, 0.5≤c≤2.53 + a = b + c, 0≤a≤1.5, 0.5≤b≤2.5, 0.5≤c≤2.5 제3항에 있어서, 무기탄산염이 탄산나트륨(Na2CO3), 중탄산나트륨(NaHCO3), 중탄산나트륨[Ca(HCO3)2] 또는 염기성 탄산마그네슘[Mg(CO3)4·Mg(OH)2·4H2O] 중에서 선택된 것인 고중합 염화알루미늄을 제조하는 방법.The inorganic carbonate according to claim 3, wherein the inorganic carbonate is sodium carbonate (Na 2 CO 3 ), sodium bicarbonate (NaHCO 3 ), sodium bicarbonate [Ca (HCO 3 ) 2 ] or basic magnesium carbonate [Mg (CO 3 ) 4 .Mg (OH) 2 · 4H 2 O] A method for producing a high polymerization aluminum chloride. 제3항에 있어서, 폴리염화알루미늄과 무기탄산염의 혼합물에 대하여 알루미늄의 함량(Al2O3기준)이 5.0∼20.0wt%이고 OH/Al의 몰비가 1.0∼2.5인 고중합 염화알루미늄을 제조하는 방법.The method of claim 3, wherein a high polymerized aluminum chloride having a content of aluminum (based on Al 2 O 3 ) of 5.0 to 20.0 wt% and a molar ratio of OH / Al of 1.0 to 2.5 with respect to the mixture of polyaluminum chloride and inorganic carbonate is prepared. Way. 유기 고분자 응집제 0.01∼0.5wt%와 하기 일반식(Ⅰ)로 표시되는 고중합 염화 알루미늄으로 조성된 수처리용 응집제 조성물.A flocculant composition for water treatment composed of 0.01 to 0.5 wt% of an organic polymer flocculant and high-polymerization aluminum chloride represented by the following general formula (I). [AlMa(OH)bClc] …… (Ⅰ)[AlM a (OH) b Cl c ]... … (Ⅰ) 여기에서 M은 Na, Ca, Mg 중 어느하나이며 a는 그 금속의 몰수를 나타내는 수이고 a, b, c는 각각 다음 범위를 만족시키는 것이다.Where M is any one of Na, Ca, and Mg, a is a number representing the number of moles of the metal, and a, b, and c each satisfy the following ranges. 3+a=b+c, 0≤a≤1.5, 0.5≤b≤2.5, 0.5≤c≤2.53 + a = b + c, 0≤a≤1.5, 0.5≤b≤2.5, 0.5≤c≤2.5 제6항에 있어서, 유기고분자 응집제가 폴리아크릴아마이드나 폴리디메틸디에틸암모늄클라이드 중에서 선택된 것인 수처리용 응집제 조성물.The flocculant composition for water treatment according to claim 6, wherein the organic polymer flocculant is selected from polyacrylamide and polydimethyldiethylammonium clyde.
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