SE530481C2 - Process for purifying water with membrane distillation comprising a pretreatment - Google Patents
Process for purifying water with membrane distillation comprising a pretreatmentInfo
- Publication number
- SE530481C2 SE530481C2 SE0700054A SE0700054A SE530481C2 SE 530481 C2 SE530481 C2 SE 530481C2 SE 0700054 A SE0700054 A SE 0700054A SE 0700054 A SE0700054 A SE 0700054A SE 530481 C2 SE530481 C2 SE 530481C2
- Authority
- SE
- Sweden
- Prior art keywords
- water
- membrane
- surface tension
- distillation
- membrane distillation
- Prior art date
Links
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims description 44
- 239000012528 membrane Substances 0.000 title claims description 34
- 238000004821 distillation Methods 0.000 title claims description 20
- 238000000034 method Methods 0.000 title claims description 6
- 150000002500 ions Chemical class 0.000 claims description 5
- -1 where one (5) Substances 0.000 claims description 4
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 claims description 3
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 claims description 3
- 229910052791 calcium Inorganic materials 0.000 claims description 3
- 239000011575 calcium Substances 0.000 claims description 3
- 229910052749 magnesium Inorganic materials 0.000 claims description 3
- 239000011777 magnesium Substances 0.000 claims description 3
- 239000012535 impurity Substances 0.000 claims description 2
- 229910002114 biscuit porcelain Inorganic materials 0.000 claims 1
- 238000002360 preparation method Methods 0.000 claims 1
- CBENFWSGALASAD-UHFFFAOYSA-N Ozone Chemical compound [O-][O+]=O CBENFWSGALASAD-UHFFFAOYSA-N 0.000 description 5
- 239000000126 substance Substances 0.000 description 5
- 239000007788 liquid Substances 0.000 description 4
- 239000003599 detergent Substances 0.000 description 3
- 230000002209 hydrophobic effect Effects 0.000 description 3
- 230000005855 radiation Effects 0.000 description 3
- 239000002351 wastewater Substances 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 239000000356 contaminant Substances 0.000 description 2
- 239000004094 surface-active agent Substances 0.000 description 2
- 241000894006 Bacteria Species 0.000 description 1
- 239000004131 EU approved raising agent Substances 0.000 description 1
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 239000000645 desinfectant Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 235000010855 food raising agent Nutrition 0.000 description 1
- 239000004519 grease Substances 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 230000001678 irradiating effect Effects 0.000 description 1
- 229910052748 manganese Inorganic materials 0.000 description 1
- 239000011572 manganese Substances 0.000 description 1
- 244000005700 microbiome Species 0.000 description 1
- 239000005416 organic matter Substances 0.000 description 1
- 239000007800 oxidant agent Substances 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- 238000002203 pretreatment Methods 0.000 description 1
- 238000000746 purification Methods 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D61/00—Processes of separation using semi-permeable membranes, e.g. dialysis, osmosis or ultrafiltration; Apparatus, accessories or auxiliary operations specially adapted therefor
- B01D61/36—Pervaporation; Membrane distillation; Liquid permeation
- B01D61/364—Membrane distillation
-
- 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
- C02F1/44—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
- C02F1/447—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis by membrane distillation
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2311/00—Details relating to membrane separation process operations and control
- B01D2311/04—Specific process operations in the feed stream; Feed pretreatment
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2311/00—Details relating to membrane separation process operations and control
- B01D2311/12—Addition of chemical agents
-
- 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
- C02F1/30—Treatment of water, waste water, or sewage by irradiation
- C02F1/32—Treatment of water, waste water, or sewage by irradiation with ultraviolet light
-
- 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
- C02F1/72—Treatment of water, waste water, or sewage by oxidation
- C02F1/78—Treatment of water, waste water, or sewage by oxidation with ozone
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/30—Organic compounds
- C02F2101/301—Detergents, surfactants
Landscapes
- Engineering & Computer Science (AREA)
- Water Supply & Treatment (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Environmental & Geological Engineering (AREA)
- Organic Chemistry (AREA)
- Separation Using Semi-Permeable Membranes (AREA)
- Heat Treatment Of Water, Waste Water Or Sewage (AREA)
Description
20 25 30 530 481 Det har dock upptäckts problem att rena vissa typer av vat- ten, däribland avloppsvatten. Avloppsvatten kommer från många olika hushåll Det har konstaterats att det och industrier. finns ett mycket stort antal oönskade ämnen med olika egen- skaper i avloppsvattnet, till exempel tvättmedel från tvätt- maskiner. I tvättmedel som används idag är amfifila moleky- ler, d.v.s. molekyler med en hydrofil respektive en hydrofob del, tillsatta för att kunna lösa upp fettfläckar. Dessa amfifila molekyler brukar ofta nämnas i tvättmedel som tensi- der, vilka fungerar bra i fläckar. Dessa syftet att lösa molekyler sänker även ytspänningen i vattnet. När ytspänning- en sänks i. vattnet som ska renas kommer vatten i flytande form att kunna passera genom membranet i MD, istället för att endast gasformigt vatten passerar membranet. Eftersom vatten i flytande form i det fallet kan passera membranet passerar även andra oönskade ämnen genom membranet, till exempel ämnen lösta i_ det vatten som ska renas. Alltså erhålls inte ett rent vatten med hjälp av MD. 20 25 30 530 481 However, problems have been discovered in purifying certain types of water, including wastewater. Wastewater comes from many different households It has been found that and industries. There are a very large number of unwanted substances with different properties in the wastewater, for example detergents from washing machines. In detergents used today, amphiphilic molecules, i.e. molecules with a hydrophilic and a hydrophobic part, respectively, added to be able to dissolve grease stains. These amphiphilic molecules are often mentioned in detergents as surfactants, which work well in stains. These purpose of dissolving molecules also lowers the surface tension in the water. When the surface tension is lowered in the water to be purified, water in liquid form will be able to pass through the membrane in MD, instead of only gaseous water passing through the membrane. Since water in liquid form in that case can pass the membrane, other undesirable substances also pass through the membrane, for example substances dissolved in the water to be purified. Thus, a clean water is not obtained with the help of MD.
Föreliggande uppfinning löser dessa problem.The present invention solves these problems.
Föreliggande uppfinning hänför sig således till ett förfaran- de för rening av vatten innefattande membrandestillering, s.k. MD, vilken destillering är anordnad att nyttja partial- tryckdifferenser med hjälp av ett hydrofobiskt membran, genom vilket membran endast gasformigt rent vatten bringas att passera varvid en vattenrest, med förhöjd halt av förorening- ar, inte passerar membranet, där en förbehandling, i vilken vattnets ytspänning bringas att höjas till en nivå där vatt- net förhindras att i flytande fornl passera nämnda membran bringas att föregå membrandestillationen , och utmärkes av, att ytspänningshojande joner, såsom kalcium eller magnesium, 10 15 20 25 30 530 481 tillsätts under förbehandlingen, varigenom vatten med minskad ytspänningsnivå, till exempel på grund av tillsats av amfifi~ la molekyler, återfår en ursprunglig ytspänningsnivå för vatten.The present invention thus relates to a process for purifying water comprising membrane distillation, so-called MD, which distillation is arranged to use partial pressure differences by means of a hydrophobic membrane, through which membrane only gaseous pure water is passed, whereby a water residue, with increased content of impurities, does not pass the membrane, where a pretreatment, in which the surface tension of the water is caused to be raised to a level where the water is prevented from passing said membrane in liquid form is caused to precede the membrane distillation, and is characterized in that surface tension-increasing ions, such as calcium or magnesium, are added during the pretreatment, whereby water with reduced surface tension level, for example due to the addition of amphiphilic molecules, regains an original surface tension level for water.
Nedan beskrivs uppfinningen närmare, delvis i samband med på bifogade ritningar visade utföringsexempel av uppfinningen, där ~ figur l visar schematiskt ett förfarande innefattande mem- brandestillering som föregås av en förbehandling.The invention is described in more detail below, partly in connection with exemplary embodiments of the invention shown in the accompanying drawings, in which Figure 1 schematically shows a process comprising membrane distillation which is preceded by a pretreatment.
Föreliggande uppfinning hänför sig således till ett förfaran- de för rening av vatten innefattande membrandestillering l, s.k. MD. Destilleringen. l är anordnad att nyttja partial- tryckdifferenser med hjälp av ett hydrofobiskt membran genom vilket membran endast gasformigt rent vatten 2 bringas att passera. En vattenrest 4, med förhöjd halt av föroreningar, passerar inte membranet.The present invention thus relates to a process for purifying water comprising membrane distillation 1, so-called MD. The distillation. 1 is arranged to use partial pressure differences by means of a hydrophobic membrane through which membrane only gaseous pure water 2 is passed. A water residue 4, with increased content of contaminants, does not pass the membrane.
Figur l. visar enligt föreliggande uppfinning att en förbe- nandling 5, i. vilken vattnets ytspänning bringas att höjas till en nivå där vattnet förhindras att i flytande form pas- sera nämnda membran, bringas att föregå membrandestillationen l. Efter membrandestillationen l bringas till exempel vatten- resten 4 från membrandestillationsanordningen l att föras vidare till en avkokningsanordning 3, i. vilken anordning 3 vattenresten 4 bringas att avkoka och bilda ånga. Därmed erhållgg fÖIhÖjd häll: en mindre volym vatten innehållande föroreningar.Figure 1 shows according to the present invention that a pretreatment 5, in which the surface tension of the water is caused to be raised to a level where the water is prevented from passing said membrane in liquid form, is caused to precede the membrane distillation 1. After the membrane distillation 1, for example, the water residue 4 from the membrane distillation device 1 to be passed on to a decoction device 3, in which device 3 the water residue 4 is caused to decoction and form steam. This results in a smaller volume of water containing contaminants.
Enligt en föredragen utföringsforn1 tillsätts ytspänningshö- jande ämnen under förbehandlingen 5. 10 15 20 25 30 530 481 Det kan också tänkas att ytspänningssänkande medel, såsom tensider, avlägsnas under förbehandlingen.According to a preferred embodiment1, surface tension raising agents are added during the pretreatment 5. It is also conceivable that surface tension lowering agents, such as surfactants, are removed during the pretreatment.
Enligt en föredragen utföringsform tillsätts ytspänningshö- jande joner, såsom kalcium eller magnesium, under förbehand- lingen 5. Därmed återfàr vatten med minskad ytspänningsnivå, till exempel p.g.a. tillsats av amfifila molekyler, en ur- sprunglig ytspänningsnivå för vatten.According to a preferred embodiment, surface tension raising ions, such as calcium or magnesium, are added during the pretreatment 5. Thus, water with reduced surface tension level is recovered, for example due to addition of amphiphilic molecules, an initial surface tension level for water.
Forbehandlingen 5 och membrandestilleringen l kan innefattas i ett slutet system. Därmed kan förorenat vatten bringas att tillföras systemet och ut ur systemet erhålls dels rent vat- ten 2 och dels en vattenrest 4.The pretreatment 5 and the membrane distillation 1 can be included in a closed system. Thus, contaminated water can be brought to the system and out of the system is obtained partly clean water 2 and partly a water residue 4.
De ovan beskrivna tillsatta jonerna kan vara vilka för ända- målet lämpliga joner som helst som medför en effekt att yt- spänningen hos vattnet höjs till en ursprunglig nivå för vatten.The added ions described above can be any ion suitable for the purpose which has the effect of raising the surface tension of the water to an initial level of water.
Enligt en foredragen utföringsform bringas ytspänningen att höjas genom att stràla vattnet som ska renas med UV-strålning under förbehandlingen 5.According to a preferred embodiment, the surface tension is raised by irradiating the water to be purified with UV radiation during the pretreatment 5.
Enligt en föredragen utföringsform bringas ytspänningen att höjas genom att tillsätta ozon till vattnet som ska renas under förbehandlingen 5.According to a preferred embodiment, the surface tension is increased by adding ozone to the water to be purified during the pre-treatment 5.
Ozon, Og, är en stark oxidant som oxiderar organiskt materi- al, järn, mangan och andra ämnen när ozon tillsätts vattnet.Ozone, Og, is a strong oxidant that oxidizes organic matter, iron, manganese and other substances when ozone is added to the water.
Ozon kan också användas son1 desinfektionsmedel. Rening med ozon har förekommit under" en längre tid. Därmedi kan ozon användas för att bryta ner de amfifila molekylerna. 10 15 530 481 Strålning av vattnet med UV-ljus innebär att UV-ljus strålar vattnet och dödar därmed bakterier och andra typer av mikro- organismer, och amfifila molekyler. bryter även ner Inga ämnen tillsätts utan endast UV-bestrålningen i sig möjliggör ett erhållande av rent vatten.Ozone can also be used as a disinfectant. Purification with ozone has taken place for a long time. Thus, ozone can be used to break down the amphiphilic molecules. Radiation of the water with UV light means that UV light radiates the water and thus kills bacteria and other types of micro organisms, and amphiphilic molecules also break down No substances are added but only the UV radiation itself enables a pure water to be obtained.
Enligt ytterligare en föredragen utföringsform är membrandes- tilleringen av typen membrandestillering med luftspalt, s.k. air gap membrane distillation (AGMD).According to a further preferred embodiment, the membrane distillation is of the type membrane distillation with air gap, so-called air gap membrane distillation (AGMD).
Ovan har ett antal utföringsförfaranden och användningar beskrivits. Emellertid kan membrandestilleringen l och förbe- handlingen 5 vara utformade på annat lämpligt sätt utan att uppfinningens grundtanke frångås.A number of embodiments and uses have been described above. However, the membrane distillation 1 and the pretreatment 5 can be designed in another suitable way without departing from the basic idea of the invention.
Föreliggande uppfinning är således inte begränsad till ovan- angivna utföringsförfaranden utan kan varieras inom dess av bifogade patentkrav angivna ram.Thus, the present invention is not limited to the above embodiments but may be varied within the scope of the appended claims.
Claims (2)
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| SE0700054A SE0700054L (en) | 2007-01-12 | 2007-01-12 | Process for purifying water with membrane distillation comprising a pretreatment |
| PCT/SE2007/051040 WO2008085103A1 (en) | 2007-01-12 | 2007-12-19 | Method for purifying water by membrane distillation comprising a pre-treatment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| SE0700054A SE0700054L (en) | 2007-01-12 | 2007-01-12 | Process for purifying water with membrane distillation comprising a pretreatment |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| SE530481C2 true SE530481C2 (en) | 2008-06-17 |
| SE0700054L SE0700054L (en) | 2008-06-17 |
Family
ID=39494617
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| SE0700054A SE0700054L (en) | 2007-01-12 | 2007-01-12 | Process for purifying water with membrane distillation comprising a pretreatment |
Country Status (2)
| Country | Link |
|---|---|
| SE (1) | SE0700054L (en) |
| WO (1) | WO2008085103A1 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102107119B (en) * | 2009-12-23 | 2013-07-31 | 吕晓龙 | Multiple-effect membrane distillation device and method |
| CN105217705B (en) * | 2015-11-06 | 2017-06-09 | 河海大学 | A kind of PPCPs classes Waste Water Treatment and method |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4460473A (en) * | 1981-01-05 | 1984-07-17 | Atlantic Richfield Company | Membrane distillation method |
| JPH07768A (en) * | 1993-06-15 | 1995-01-06 | Hitachi Ltd | Membrane distillation device |
-
2007
- 2007-01-12 SE SE0700054A patent/SE0700054L/en not_active IP Right Cessation
- 2007-12-19 WO PCT/SE2007/051040 patent/WO2008085103A1/en active Application Filing
Also Published As
| Publication number | Publication date |
|---|---|
| WO2008085103A1 (en) | 2008-07-17 |
| SE0700054L (en) | 2008-06-17 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| NUG | Patent has lapsed |