PL190030B1 - Method of preventing solid matter accumulation on membranes during a process of concentrating aqueous salt solutions in particular those of iron salt - Google Patents
Method of preventing solid matter accumulation on membranes during a process of concentrating aqueous salt solutions in particular those of iron saltInfo
- Publication number
- PL190030B1 PL190030B1 PL99331129A PL33112999A PL190030B1 PL 190030 B1 PL190030 B1 PL 190030B1 PL 99331129 A PL99331129 A PL 99331129A PL 33112999 A PL33112999 A PL 33112999A PL 190030 B1 PL190030 B1 PL 190030B1
- Authority
- PL
- Poland
- Prior art keywords
- membrane
- solution
- distillation
- concentration
- modules
- Prior art date
Links
- 239000012528 membrane Substances 0.000 title claims abstract description 25
- 238000000034 method Methods 0.000 title claims abstract description 20
- 239000012266 salt solution Substances 0.000 title claims abstract description 10
- 238000009825 accumulation Methods 0.000 title 1
- 150000002505 iron Chemical class 0.000 title 1
- 239000007787 solid Substances 0.000 title 1
- 239000000243 solution Substances 0.000 claims abstract description 14
- 238000004821 distillation Methods 0.000 claims abstract description 11
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 claims abstract description 5
- 159000000014 iron salts Chemical class 0.000 claims abstract description 5
- 238000005406 washing Methods 0.000 claims description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 2
- 150000003839 salts Chemical class 0.000 abstract 2
- 239000012487 rinsing solution Substances 0.000 abstract 1
- 235000011149 sulphuric acid Nutrition 0.000 abstract 1
- 239000001117 sulphuric acid Substances 0.000 abstract 1
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 3
- 238000009434 installation Methods 0.000 description 2
- 239000011550 stock solution Substances 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- 239000007864 aqueous solution Substances 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000008021 deposition Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 150000002506 iron compounds Chemical class 0.000 description 1
- 229910000358 iron sulfate Inorganic materials 0.000 description 1
- BAUYGSIQEAFULO-UHFFFAOYSA-L iron(2+) sulfate (anhydrous) Chemical compound [Fe+2].[O-]S([O-])(=O)=O BAUYGSIQEAFULO-UHFFFAOYSA-L 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
Landscapes
- Separation Using Semi-Permeable Membranes (AREA)
Abstract
Description
Przedmiotem wynalazku jest sposób zapobiegania zanieczyszczaniu się membran w trakcie zatęzania wodnych roztworów soli, zwłaszcza soli zelaza.The present invention relates to a method of preventing fouling of membranes during the concentration of aqueous salt solutions, especially iron salts.
Znane sposoby zatężania roztworów polegają na ich ogrzewaniu bądź w aparatach wypamych ze swobodnym krążeniem takich jak panwie, czy kotły, bądź w aparatach z cyrkulacją wymuszoną za pomocą pompy. Z literatury opisującej proces destylacji membranowej znana jest możliwość zatęzania roztworów soli metodą destylacji membranowej. Metoda ta chociaż prostsza od metod tradycyjnych nie znajduje zastosowania w praktyce, gdyż w trakcie zatęzania membrany ulegają zanieczyszczeniu rozdzielanymi substancjami, przez co maleje ich przepuszczalność. Zjawisko to prowadzi do spadku wydajności procesu, co jest jedną z głównych przyczyn ograniczających szerokie zastosowanie w praktyce procesów membranowych do zatężania wodnych roztworów.The known methods of concentrating solutions consist in heating them either in free circulation devices such as pans or boilers, or in devices with forced circulation by means of a pump. From the literature describing the process of membrane distillation, it is known that salt solutions can be concentrated by membrane distillation. This method, although simpler than traditional methods, is not applicable in practice, because during concentration the membranes are contaminated with separated substances, which reduces their permeability. This phenomenon leads to a decrease in the efficiency of the process, which is one of the main reasons limiting the wide application in practice of membrane processes for the concentration of aqueous solutions.
Istota sposobu według wynalazku polega na tym, że wodne roztwory soli, zwłaszcza soli zelaza, zatęza się techniką destylacji membranowej prowadząc proces destylacji do czasu obniżenia uzyskanego strumienia destylatu o 5-50%, po czym zatężany roztwór soli usuwa się z modułów destylacji membranowej zaś moduły membranowe płucze się obustronnie 0,5% do 10% roztworem kwasu siarkowego w czasie od 10 do 120 minut. Następnie usuwa się roztwór płuczący, ponownie napełnia się moduły membranowe zatężanym roztworem soli i kontynuuje się proces zatężania.The essence of the method according to the invention is that aqueous salt solutions, especially iron salts, are concentrated by membrane distillation by carrying out the distillation process until the distillate stream is reduced by 5-50%, then the concentrated salt solution is removed from the membrane distillation modules and the modules the membranes are rinsed on both sides with 0.5% to 10% sulfuric acid solution for 10 to 120 minutes. The washing solution is then removed, the membrane modules are refilled with concentrated salt solution and the concentration process continued.
Sposób według wynalazku eliminuje niekorzystne zjawisko osadzania się na powierzchni membran rozdzielanych substancji, zwłaszcza związków żelaza, a tym samym umożliwia zastosowanie w praktyce instalacji membranowej do oczyszczania szeregu roztworów odpadowych, zwłaszcza roztworów odpadowych zawierających sole żelaza.The method according to the invention eliminates the disadvantageous phenomenon of deposition on the surface of the membranes of substances to be separated, in particular iron compounds, and thus enables the practical use of a membrane installation for the treatment of a number of waste solutions, in particular waste solutions containing iron salts.
Sposób według wynalazku objaśniony jest bliżej w przykładzie, wykonania. Przygotowano roztwór wyjściowy siarczanu zelaza o stężeniu 25 g Fe(ll)/dmJ. Instalację membranową napełniono roztworem wyjściowym i zatęzano przez okres kilkudziesięciu godzin. Temperatura roztworu na wejściu do modułu wynosiła 353 K, a destylatu 293 K. W okresie początkowym przez membrany odbierano destylat, czystą wodę, w ilości 270 dm3 w przeliczeniu na 1 m2 membrany w ciągu 24 godzin. Po uzyskaniu stężenia 180 g Fe(ll)/dm3 proces zatęzania przerwano. Roztwór w instalacji zamieniono na wyjściowy, o stężeniu 25 g Fe(ll)/dm2 i proces zatężania wznowiono z zachowaniem uprzednich warunków pracy. Uzyskany strumień destylatu zmalał i wynosił 210 dm3/m2. Instalację membranową ponownie opróżniono i przepłukano 1% H2SO4. Płukanie prowadzono przez okres 1 godziny. Po płukaniu wznowiono zatężanie roztworu wyjściowego, uzyskując strumień destylatu równy 268 dm2/m2 dobę.The method according to the invention is explained in more detail in an exemplary embodiment. A stock solution of iron sulfate with a concentration of 25 g Fe (II) / dm J was prepared. The membrane plant was filled with stock solution and concentrated over a period of several dozen hours. The temperature of the solution at the entrance to the module was 353 K, and the temperature of the distillate was 293 K. In the initial period, the distillate, pure water, was collected through the membranes in the amount of 270 dm 3 per 1 m 2 of the membrane during 24 hours. After reaching the concentration of 180 g Fe (II) / dm3, the concentration process was stopped. The solution in the installation was changed to the original solution with a concentration of 25 g Fe (II) / dm2 and the concentration process was resumed under the previous operating conditions. The obtained distillate stream decreased and amounted to 210 dm3 / m 2 . The membrane plant was drained again and rinsed with 1% H 2 SO 4. Rinsing was carried out for a period of 1 hour. After rinsing, concentration of the starting solution was resumed, giving a distillate stream of 268 dm2 / m2 day.
Departament Wydawnictw UP RP Nakład 50 egz. Cena 2,00 złPublishing Department of the Polish Patent Office. Circulation 50 copies. Price PLN 2.00
Claims (1)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| PL99331129A PL190030B1 (en) | 1999-01-29 | 1999-01-29 | Method of preventing solid matter accumulation on membranes during a process of concentrating aqueous salt solutions in particular those of iron salt |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| PL99331129A PL190030B1 (en) | 1999-01-29 | 1999-01-29 | Method of preventing solid matter accumulation on membranes during a process of concentrating aqueous salt solutions in particular those of iron salt |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| PL331129A1 PL331129A1 (en) | 2000-07-31 |
| PL190030B1 true PL190030B1 (en) | 2005-10-31 |
Family
ID=20073677
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PL99331129A PL190030B1 (en) | 1999-01-29 | 1999-01-29 | Method of preventing solid matter accumulation on membranes during a process of concentrating aqueous salt solutions in particular those of iron salt |
Country Status (1)
| Country | Link |
|---|---|
| PL (1) | PL190030B1 (en) |
-
1999
- 1999-01-29 PL PL99331129A patent/PL190030B1/en unknown
Also Published As
| Publication number | Publication date |
|---|---|
| PL331129A1 (en) | 2000-07-31 |
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