KR20130054557A - The preparing method of aluminium sulfate from waste water - Google Patents

The preparing method of aluminium sulfate from waste water Download PDF

Info

Publication number
KR20130054557A
KR20130054557A KR1020110120001A KR20110120001A KR20130054557A KR 20130054557 A KR20130054557 A KR 20130054557A KR 1020110120001 A KR1020110120001 A KR 1020110120001A KR 20110120001 A KR20110120001 A KR 20110120001A KR 20130054557 A KR20130054557 A KR 20130054557A
Authority
KR
South Korea
Prior art keywords
waste
aluminum sulfate
aluminum
reaction
sulfuric acid
Prior art date
Application number
KR1020110120001A
Other languages
Korean (ko)
Other versions
KR101297435B1 (en
Inventor
최동민
Original Assignee
주식회사 워켐
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 주식회사 워켐 filed Critical 주식회사 워켐
Priority to KR1020110120001A priority Critical patent/KR101297435B1/en
Publication of KR20130054557A publication Critical patent/KR20130054557A/en
Application granted granted Critical
Publication of KR101297435B1 publication Critical patent/KR101297435B1/en

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01F—COMPOUNDS OF THE METALS BERYLLIUM, MAGNESIUM, ALUMINIUM, CALCIUM, STRONTIUM, BARIUM, RADIUM, THORIUM, OR OF THE RARE-EARTH METALS
    • C01F7/00—Compounds of aluminium
    • C01F7/68—Aluminium compounds containing sulfur
    • C01F7/74—Sulfates
    • 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
    • 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
    • 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
    • C02F1/66—Treatment of water, waste water, or sewage by neutralisation; pH adjustment
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W10/00—Technologies for wastewater treatment
    • Y02W10/40—Valorisation of by-products of wastewater, sewage or sludge processing
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W30/00—Technologies for solid waste management
    • Y02W30/50—Reuse, recycling or recovery technologies

Abstract

PURPOSE: A manufacturing method of an aluminum sulfate from waste is provided to manufacture high quality inorganic coagulant with low cost, by pretreating and recycling aluminum components in waste. CONSTITUTION: A manufacturing method of an aluminum sulfate from waste comprises a step of injecting sulfate into waste containing aluminum and conducting a reaction by using dissolution head and neutralization reaction heat. The reaction is conducted for 2 hours at 110-155 °C. The aluminum sulfate obtained by the reaction is used for manufacturing inorganic coagulant for waste treatment. The inorganic coagulant for waste treatment consists of aluminum sulfate and a ferric salt of sulfuric acid or hydrochloric acid.

Description

폐수 및 폐기물로부터 황산 알루미늄의 제조방법{The preparing method of aluminium sulfate from waste water}The preparing method of aluminum sulfate from waste water

본 발명은 폐수 및 폐기물로부터 황산 알루미늄의 제조방법에 관한 것으로, 더욱 상세하게는 폐수 처리에 사용되는 무기 응집제에 이용되는 알루미늄을 폐수 및 폐기물로부터 회수하여 재활용하는 방법에 관한 것이다.
The present invention relates to a method for producing aluminum sulfate from wastewater and waste, and more particularly, to a method for recovering and recycling aluminum used in inorganic flocculants used for wastewater treatment from wastewater and waste.

본 발명은 폐수 및 폐기물로부터 황산 알루미늄의 제조방법에 관한 것으로, 더욱 상세하게는 폐수 처리에 사용되는 무기 응집제에 이용되는 알루미늄을 폐수 및 폐기물로부터 회수하여 재활용하는 방법에 관한 것이다.The present invention relates to a method for producing aluminum sulfate from wastewater and waste, and more particularly, to a method for recovering and recycling aluminum used in inorganic flocculants used for wastewater treatment from wastewater and waste.

무기응집제는 폐수에 포함된 유기성, 무기성 콜로이드 입자의 표면전하를 중화시킴으로서 콜로이드 입자를 응집시키고 침강시켜 제거하는 약품이다. 처리된 폐수의 수질을 개선시킬 목적으로, 오래 전부터 사용해 오고 있는 폐수처리 중요한 약품 중 하나이다.Inorganic coagulant is a drug that coagulates and precipitates colloidal particles by neutralizing the surface charge of organic and inorganic colloid particles contained in wastewater. It is one of the important wastewater treatment chemicals that has been used for a long time in order to improve the quality of treated wastewater.

이러한 무기 응집제 가운데, 대표적인 것으로 Alum(황산 알루미늄), 황산철, 염화철, PAC 등이 있고, 산업체 폐수처리장 수질에 따라 가장 일반적으로 Alum이나 제이철염을 보통 사용하고 있다.
Representative examples of such inorganic flocculants include Alum (aluminum sulfate), iron sulfate, iron chloride, and PAC, and most commonly Alum or Ferric Salt are used depending on industrial wastewater treatment water quality.

본 발명은 폐수 및 폐기물로부터 황산 알루미늄을 회수하여 재활용하는 방법을 제공하는 것이다.
The present invention provides a method for recovering and recycling aluminum sulfate from wastewater and wastes.

황산 알루미늄을 제조하기 위해서는 수산화알루미늄과 황산을 반응시켜 제조하며 반응식은 다음과 같다.In order to prepare aluminum sulfate, aluminum hydroxide and sulfuric acid are reacted, and a reaction formula is as follows.

2Al(OH)3 + 3H2SO4 → Al2(SO4)3· 6H2O 2Al (OH) 3 + 3H 2 SO 4 → Al 2 (SO 4) 3 · 6H 2 O

또한, 이렇게 회수된 황산알루미늄을 제이철염과 혼합하여 사용하면, 황산알루미늄과 제이철염의 장단점을 상호보완한 무기 응집제를 제조할 수 있다.
When the aluminum sulfate thus recovered is mixed with ferric salt, an inorganic flocculant having complementary advantages and disadvantages of aluminum sulfate and ferric salt can be produced.

본 발명의 제조방법에 의해 폐기물 및 폐수로부터 알루미늄을 회수하여 재활용함으로써 환경오염 방지와 자원 재활용 효과를 나타낼 수 있다. By recovering and recycling aluminum from waste and wastewater by the manufacturing method of the present invention, it is possible to exhibit environmental pollution prevention and resource recycling effects.

또한, 본 발명에 의해 제조된 황산 알루미늄과 제이철염을 혼합한 무기 응집제는 콜로이드의 흡착력, 슬러지 침강성이 우수하고, COD 및 중금속 처리효율에서 기존 무기응집제에 비해 탁월한 성능을 모두 가지고 있다.
In addition, the inorganic flocculant mixed with aluminum sulfate and ferric salt prepared according to the present invention is excellent in the adsorption power of the colloid, sludge settling properties, and excellent performance compared to the conventional inorganic coagulant in COD and heavy metal treatment efficiency.

황산 알루미늄을 제조하기 위해서는 수산화알루미늄과 황산을 반응시켜 제조하며 반응식은 다음과 같다In order to prepare aluminum sulfate, it is prepared by reacting aluminum hydroxide with sulfuric acid.

2Al(OH)3 + 3H2SO4 → Al2(SO4)3· 6H2O 2Al (OH) 3 + 3H 2 SO 4 → Al 2 (SO 4) 3 · 6H 2 O

본 발명의 제조방법에서는 폐수 및 폐기물 내의 알루미늄 성분을 원료로 재활용하고 폐수 및 폐기물 내 포함된 산(acid)들도 재활용한다. In the manufacturing method of the present invention, aluminum components in the wastewater and the waste are recycled as raw materials, and acids contained in the wastewater and the waste are also recycled.

본 발명의 제조방법은 황산을 투입하여 황산의 용해열과 중화반응열을 이용하여 110~115℃에서 충분히 반응시키고, 이후 50℃이하로 냉각하는 것으로 구성된다. The production method of the present invention consists of adding sulfuric acid to sufficiently react at 110 ~ 115 ℃ using the heat of dissolution and neutralization reaction heat of sulfuric acid, and then cooled to 50 ℃ or less.

상세하게 설명하면 다음과 같다. The details are as follows.

보온이 철저히 된 반응기에 재활용 수산화알루미늄, 전처리된 알루미늄 포함 폐수, 재활용 수산화알루미늄 Cake 등(재활용 수산화알루미늄 - Al(OH)3 97.5%, 재활용 수산화알루미늄 Cake - Al(OH)3 25.0%, 재활용 알루미늄 폐수 - Al2O3 17%)을 투입하고 충분한 슬러리 상태가 이루어지도록 교반한다.Recycled aluminum hydroxide, wastewater containing pretreated aluminum, recycled aluminum hydroxide cake, etc. (recycled aluminum hydroxide-Al (OH) 3 97.5%, recycled aluminum hydroxide cake-Al (OH) 3 25.0%, recycled aluminum wastewater Add Al 2 O 3 17%) and stir to achieve a sufficient slurry.

다음 단계에서 투입하는 진한 황산과 혼합되었을 때 초기 형성되는 황산의 농도가 60~ 70%가 되도록 1차 용수를 공급한다.When mixed with the concentrated sulfuric acid introduced in the next step, the primary water is supplied so that the concentration of sulfuric acid formed is 60-70%.

반응식에 의거 계산된 진한 황산을 원활하게 투입하기 위하여 Dipping배관을 반응기 바닥 가까이에 설치하고 약 30분에 걸쳐서 투입되도록 정량 펌프를 가동한다.In order to smoothly add the concentrated sulfuric acid calculated according to the reaction scheme, a dipping pipe is installed near the bottom of the reactor, and the metering pump is operated to be added for about 30 minutes.

반응기 내부 액은 황산이 물에 용해될 때 발생하는 용해열에 의해 온도가 상승하기 시작하며 중화 반응열과 함께 100℃까지 상승하게 되면 Boiling 상태가 된다. 이 시점에서 황산투입을 중지한다. The liquid inside the reactor starts to rise in temperature due to the heat of dissolution generated when sulfuric acid is dissolved in water. At this point, sulfuric acid injection is stopped.

이후에는 중화반응열의 상승작용에 의해서 온도가 115℃ 정도로 상승하게 된다. 온도가 다시 하강하기 시작하면 반응기 내부온도가 110 ~ 115℃가 유지되도록 정량 펌프의 유량을 조절하여 잔여 황산을 투입한다.Thereafter, the temperature rises to about 115 ° C by synergy of the heat of neutralization reaction. When the temperature starts to fall again, the remaining sulfuric acid is added by adjusting the flow rate of the metering pump so that the reactor internal temperature is maintained at 110 ~ 115 ℃.

황산 알루미늄 제조반응의 종료는 반응액 온도를 기준하여 112℃에서 120분 반응을 기준으로 한다.The completion of the aluminum sulfate production reaction is based on a 120-minute reaction at 112 ° C based on the reaction solution temperature.

이하 본 발명을 실시예를 통해 보다 상세하게 설명한다.
Hereinafter, the present invention will be described in more detail with reference to Examples.

<실시예 1>&Lt; Example 1 >

재활용 수산화알루미늄과 재활용 알루미늄 포함폐수 사용 예Examples of recycled aluminum hydroxide and recycled aluminum wastewater

4L 4구 둥근 플라스크에 재활용 수산화알루미늄 200g과 재활용 알루미늄 포함폐수 100g을 투입하고 1차 용수 325g을 가한 다음 완전히 슬러리화 할 수 있도록 교반하였다. 98% 황산 452g을 천천히 투입하니 황산 용해열과 중화 반응열이 발생하여 온도가 상승하기 시작하였다. 100℃부근에서 Boiling 하기 시작하면 황산투입을 중지하고 110~115℃가 될 때까지 기다렸다. 온도가 하강하기 시작하면 잔여황산을 천천히 투입하여 온도가 110~115℃가 유지되도록 하였다. 반응의 종료는 반응액 온도를 기준하여 112℃에서 120분 반응을 기준으로 하였다.
200 g of recycled aluminum hydroxide and 100 g of wastewater containing recycled aluminum were added to a 4L four-necked round flask, and 325 g of primary water was added thereto, followed by stirring to fully slurry. When 452 g of 98% sulfuric acid was slowly added, the heat of dissolution of sulfuric acid and the heat of neutralization reaction were generated and the temperature started to rise. When boiling was started at around 100 ℃, sulfuric acid was stopped and waited until it reached 110 ~ 115 ℃. When the temperature began to drop, the remaining sulfuric acid was slowly added to maintain the temperature of 110-115 ° C. Termination of the reaction was based on the reaction 120 minutes at 112 ℃ based on the reaction solution temperature.

<제조예 1>&Lt; Preparation Example 1 &

실시예 1에서 제조된 반응생성물에 황산 제이철을 부가하고 용수를 부가하여 황산알루미늄의 농도는 5% 황산 제2철의 농도는 2%가 되도록 조절하였다. 최종 제품의 무게는 2865g이었다. 24시간 숙성시킨 후 여과하여 제품화하였다.
Ferric sulfate was added to the reaction product prepared in Example 1 and water was added to adjust the concentration of aluminum sulfate to 5% and the concentration of ferric sulfate to 2%. The final product weighed 2865 g. After aging for 24 hours, the product was filtered.

<제조예 2>&Lt; Preparation Example 2 &

황산 제이철 대신 염산 제이철을 사용하는 것을 제외하고는 제조예 1과 같이 제조하였다.
It was prepared in the same manner as in Preparation Example 1 except that ferric hydrochloride was used instead of ferric sulfate.

<시험예><Test Example>

제조예 1,2,3 3종을 일반적으로 산업체에 사용하고 있는 7% 황산알루미늄과 10% 제이철염을 비교 시험하여 본 발명품을 평가하였다.
Preparation Example 1, 2, 3 Three kinds of 7% aluminum sulfate and 10% ferric salt, which are generally used in industry, were tested to evaluate the present invention.

-표준 폐수 성상- Standard wastewater characteristics

ItemsItems 단위unit ResultsResults pHpH -- 10.510.5 CODCOD mg/ℓmg / l 1,0251,025 T-NT-N mg/ℓmg / l 2222 T-PT-P mg/ℓmg / l 1313 SSSS mg/ℓmg / l 862862 T-CrT-Cr mg/ℓmg / l 2.52.5 AsAs mg/ℓmg / l 2.02.0 PbPb mg/ℓmg / l 1.51.5 CuCu mg/ℓmg / l 2.42.4

- 시험 조건- Exam conditions

1) 무기응집제 : 각각의 제품 별로 동일량 투입1) Inorganic coagulant: the same amount for each product

2) pH 중화제 : 25% 소석회수 (pH Target 7.0)2) pH neutralizer: 25% lime water (pH Target 7.0)

3) 중합체 : A-230E (음이온 계)
3) Polymer: A-230E (Anionic)

- 시험 결과- Test result

7% 7% AlumAlum 10%   10%
제이철염   Ferric salt 본 발명품(The present invention ( Al2O3Al2O3 5.0%+ 5.0% + Fe3Fe3 + 2.0%)+ 2.0%) 제조예Manufacturing example 1 One 제조예Manufacturing example 2 2
응집제 투입량(ppm)Coagulant input (ppm) 500500 500500 500500 500
500
중화제 투입량(ppm)Neutralizing agent input (ppm) 1,2001,200 1,3501,350 1,1501,150 1,150
1,150
Polymer 투입량(ppm)Polymer input (ppm) 44 44 44 4
4
Floc Size (mm)Floc Size (mm) 1.5 ~ 2.251.5 to 2.25 1.0 ~ 1.51.0 to 1.5 2.25 ~ 3.02.25 to 3.0 2.25 ~ 3.0
2.25 to 3.0
SV30 (%)SV30 (%) 2222 1414 1616 16
16
처리수Treated water 수질 Water quality COD (ppm)COD (ppm) 565565 600600 520520 515
515
COD 제거율(%)COD Removal Rate (%) 44.944.9 41.541.5 49.349.3 49.8
49.8
T-N (ppm)T-N (ppm) 1616 1717 1414 14
14
T-P (ppm)T-P (ppm) 1.51.5 1.71.7 1.31.3 1.3
1.3
SS (ppm)SS (ppm) 1212 1010 88 7
7
T-Cr (ppm)T-Cr (ppm) 1.01.0 1.01.0 0.40.4 0.4
0.4
As (ppm)As (ppm) 0.60.6 0.50.5 0.30.3 0.3
0.3
Pb (ppm)Pb (ppm) 0.60.6 0.50.5 0.20.2 0.2
0.2
Cu (ppm)Cu (ppm) 0.70.7 0.60.6 0.20.2 0.2
0.2
SludgeSludge 발생량 Generation O.D (gr/ℓ)O.D (gr / l) 2.0242.024 2.5202.520 1.9541.954 2.000
2.000

기존 시판 응집제인 7% 황산알루미늄 및 10% 제이철염 사용대비 본 발명의 제조예 1, 2 의 제품은 CDD 제거율이 우수하고, 중금속 제거율이 우수하며, Floc 침강성이 우수하고, 처리수 중 SS 함량이 낮으며 Sludge 탈수 속도가 우수함을 알 수 있다.The products of Preparation Examples 1 and 2 of the present invention have excellent CDD removal rate, good heavy metal removal rate, good floc sedimentation, and SS content in treated water, compared to the existing commercially available coagulant, 7% aluminum sulfate and 10% ferric salt. It is low and the sludge dewatering speed is excellent.

Claims (3)

알루미늄을 포함한 폐수 또는 폐기물에 황산을 투입하여 황산의 용해열과 중화반응열을 이용하여 반응시키는 것을 특징으로 하는 황산알루미늄의 제조방법.
A method for producing aluminum sulfate, characterized in that the sulfuric acid is added to wastewater or wastewater containing aluminum and reacted using heat of dissolution of sulfuric acid and heat of neutralization reaction.
제 1항에 있어서,
상기 반응은 110~115℃에서 2시간 이루어지는 것을 특징으로 하는 황산알루미늄의 제조방법.
The method of claim 1,
The reaction is a method for producing aluminum sulfate, characterized in that made for 2 hours at 110 ~ 115 ℃.
제 1항 의해 얻어진 황산알루미늄 및 황산 또는 염산의 제이철염으로 이루어지는 것을 특징으로 하는 폐수 처리용 무기 응집제.An inorganic flocculant for wastewater treatment, comprising ferric salt of aluminum sulfate and sulfuric acid or hydrochloric acid obtained according to claim 1.
KR1020110120001A 2011-11-17 2011-11-17 The preparing method of aluminium sulfate from waste water KR101297435B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
KR1020110120001A KR101297435B1 (en) 2011-11-17 2011-11-17 The preparing method of aluminium sulfate from waste water

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
KR1020110120001A KR101297435B1 (en) 2011-11-17 2011-11-17 The preparing method of aluminium sulfate from waste water

Publications (2)

Publication Number Publication Date
KR20130054557A true KR20130054557A (en) 2013-05-27
KR101297435B1 KR101297435B1 (en) 2013-08-19

Family

ID=48663319

Family Applications (1)

Application Number Title Priority Date Filing Date
KR1020110120001A KR101297435B1 (en) 2011-11-17 2011-11-17 The preparing method of aluminium sulfate from waste water

Country Status (1)

Country Link
KR (1) KR101297435B1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3472108A4 (en) * 2016-06-16 2020-02-19 Hans David Staffan Ulmert Method for recovering coagulants from chemical wastewater from water and waste water treatment plants

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101790289B1 (en) * 2017-04-14 2017-10-27 주식회사 태원 Method of manufacturing ferric sulfate solutions which has low concentration of free acid with improved filtration
KR101980478B1 (en) 2018-01-19 2019-05-21 신태욱 Manufacturing method of inorganic coagulants used acid waste water for treatment an activated clay
KR102630157B1 (en) 2023-09-25 2024-01-29 주식회사 그린이앤씨 Aluminium sulfate manufacture system and manufacture method

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100221977B1 (en) * 1997-06-16 1999-09-15 김명호 Method for producing cohesive of inorganic polymer
KR100947674B1 (en) 2009-02-11 2010-03-12 (주) 에코솔루텍 Manufacture method of high functional cohesive agent for water-treatment

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3472108A4 (en) * 2016-06-16 2020-02-19 Hans David Staffan Ulmert Method for recovering coagulants from chemical wastewater from water and waste water treatment plants

Also Published As

Publication number Publication date
KR101297435B1 (en) 2013-08-19

Similar Documents

Publication Publication Date Title
Jangkorn et al. Evaluation of reusing alum sludge for the coagulation of industrial wastewater containing mixed anionic surfactants
KR101297435B1 (en) The preparing method of aluminium sulfate from waste water
CN103043759A (en) Method for preparing polyaluminium ferric chloride flocculating agent by pickling waste liquid and waste aluminium material
US11053143B2 (en) Stable concentrated polyaluminum chlorosilicate solutions
CN104495995A (en) Method for preparing polyaluminum ferric chloride sulfate by using industrial waste
CN104512951A (en) Method for co-production of ploysilicate aluminium ferric sulphate and waste water treatment powder by PAC (poly aluminum chloride) residues
CN101759218B (en) Preparation method of pulping waste water flocculant
CN108483597B (en) Method for preparing solid polymeric ferric sulfate
CN103663659A (en) Composite flocculant and preparation method thereof
KR101128864B1 (en) Inorganic cohesive agents for water-treatment and Preparing method thereof
CN106698536A (en) Water purifier and preparation method thereof
KR101990179B1 (en) Method and apparatus for treating borofluoride-containing water
US20100061919A1 (en) Production of polyaluminum chloride from basic aluminum chloride and sodium aluminate via ultrasonic processing
KR100221977B1 (en) Method for producing cohesive of inorganic polymer
CN107540066B (en) Preparation process of poly-phosphorus aluminum chloride
CN104085973A (en) Preparation method of industrial water fluorine removal agent
KR101119623B1 (en) Inorganic cohesive agents for water-treatment and Preparing method thereof
CN104528903A (en) Flocculating agent for processing industrial wastewater of aluminum material factory and preparation method of flocculating agent
KR102141652B1 (en) Method for preparing poly aluminium chloride-based coagulants
KR20150103940A (en) A inorganic coagulant of fluoride ion in water treatment and the preparation method thereof
KR101887412B1 (en) Method of preparation for Alkaline coagulant and treating method of water/wastewater using the same
KR101403942B1 (en) The preparing method of ferric salt from waste water
CN102616905B (en) Organic and inorganic composite high-efficiency flocculating agent and preparation method thereof
KR20160043322A (en) Wastewater Treatment System for Removing Fluorine
CN101696067B (en) Method for reducing ammonia nitrogen contents in turmeric saponin wastewater

Legal Events

Date Code Title Description
A201 Request for examination
N231 Notification of change of applicant
E902 Notification of reason for refusal
E701 Decision to grant or registration of patent right
GRNT Written decision to grant
FPAY Annual fee payment

Payment date: 20160804

Year of fee payment: 4

FPAY Annual fee payment

Payment date: 20170619

Year of fee payment: 5

FPAY Annual fee payment

Payment date: 20180615

Year of fee payment: 6

FPAY Annual fee payment

Payment date: 20190620

Year of fee payment: 7