Thermoelectric air gap membrane distillation system and process
A distillation apparatus having a hot liquid block, a thermoelectric module (TEM), a condensation surface, a feed liquid chamber having a feed chamber inlet, a feed chamber outlet, and a membrane disposed on at least one side of the feed liquid chamber. One side of the membrane faces to the condensation surface. An air gap of 1 mm to 20 cm separates the condensation surface and the membrane. A permeate outlet in fluid communication with the air gap. A heating unit in fluid communication with the feed liquid chamber and the hot liquid block. A cooling unit in fluid communication with the permeate outlet. A multi-stage distillation apparatus with a plurality of distillation apparatuses. A process of distilling water, by feeding a liquid into the distillation apparatus through the hot block inlet and collecting distilled water from the permeate outlet.
1. A distillation apparatus, comprising:
a hot liquid block having a hot block inlet and a hot block outlet;
a thermoelectric module (TEM) having a first side and a second side opposite the first side, wherein the hot liquid block is adjacent to the first side of the TEM;
a condensation surface having a first side and a second side opposite the first side, wherein the first side of the condensation surface is adjacent to the second side of the TEM;
a feed liquid chamber having a feed chamber inlet, a feed chamber outlet, and a membrane disposed on at least one side of the feed liquid chamber;
wherein one side of the membrane faces to the condensation surface;
an air gap of 1-200 mm separates the condensation surface and the membrane;
a permeate outlet in fluid communication with the air gap;
a heating unit in fluid communication with the feed liquid chamber and the hot liquid block; and
a cooling unit in fluid communication with the permeate outlet,
wherein the heating unit comprises a first heat exchanger, and at least one module selected from the group consisting of (1) a drying unit (DU), a drying unit inlet to DU, and a drying unit outlet of DU, or (2) a space heating unit (SH), a space heating inlet to SH, and a space heating outlet of SH;
wherein the first heat exchanger is fluidly connected to the feed liquid chamber through the feed chamber outlet; and
wherein the first heat exchanger is fluidly connected the hot liquid block through the hot block inlet.
2. The distillation apparatus of claim 1 , wherein the cooling unit comprises a second heat exchanger, and at least one module selected from the group consisting of a cooling unit (CU) and a space cooling unit, wherein the CU comprises a cooling unit inlet and a cooling unit outlet, and wherein the SC comprises a space cooling inlet and a space cooling outlet;
wherein the second heat exchanger is fluidly connected to the permeate outlet.
3. The distillation apparatus of claim 1 , wherein the apparatus further comprises a first TEM and second TEM each having a first side and a second side opposite the first side, wherein the first side of the first TEM is adjacent to the hot liquid block and the second side of the second TEM is adjacent to the condensation surface.
4. The distillation apparatus of claim 1 , wherein the membrane is a polytetrafluoroethylene flat sheet.
5. The distillation apparatus of claim 4 , wherein the polytetrafluoroethylene flat sheet has a mean pore size between 0.1 μm and 10 μm.
6. The distillation apparatus of claim 1 , wherein the air gap includes a rubber support to separate the second side of the condensation surface and the membrane.
7. The distillation apparatus of claim 1 , wherein the first heat exchanger is at least one selected from the group consisting of plate heat exchanger, a tube in tube heat exchanger, a shell and tube heat exchanger, a plate and shell heat exchanger, a plate fin heat exchanger, a double tube heat exchanger, an adiabatic wheel heat exchanger, and a finned tube heat exchanger.
8. The distillation apparatus of claim 2 , wherein the second heat exchanger is at least one selected from the group consisting of plate heat exchanger, a tube in tube heat exchanger, a shell and tube heat exchanger, a plate and shell heat exchanger, a plate fin heat exchanger, a double tube heat exchanger, an adiabatic wheel heat exchanger, and a finned tube heat exchanger.
9. A multi-stage distillation apparatus comprising a plurality of the distillation apparatuses according to claim 1 .
10. The multi-stage distillation apparatus of claim 9 , wherein a first feed liquid chamber in a first stage and a second feed liquid chamber in an adjacent stage are both in fluid communication with a first hot liquid block in the first stage through a first hot block inlet.
11. The multi-stage distillation apparatus of claim 9 , wherein a first hot liquid block in a first stage and a second hot liquid block in an adjacent stage are both in fluid communication with a first feed liquid chamber in the first stage through a first feed chamber inlet.
12. The multi-stage distillation apparatus of claim 9 , wherein a first feed liquid chamber in a first stage and a second feed liquid chamber in an adjacent stage are both in fluid communication with an inlet of a first heat exchanger through feed chamber outlets.
13. The multi-stage distillation apparatus of claim 9 , wherein a first hot liquid block in a first stage and a second hot liquid block in an adjacent stage are both in fluid communication with an outlet of a first heat exchanger through hot block inlets.
14. The multi-stage distillation apparatus of claim 9 , wherein the apparatus further comprises a plurality of thermoelectric modules (TEMs) each having a first side and a second side opposite the first side, wherein and a hot liquid block of a first stage is adjacent to a first side of the first TEM and the second side of the condensation surface of the first stage is adjacent to a second side of a second TEM of the first stage.
15. The multi-stage distillation apparatus of claim 9 , wherein a first air gap in a first stage and a second air gap in an adjacent stage are both in fluid communication with an inlet of a second heat exchanger through air gap outlets.
16. The multi-stage distillation apparatus of claim 9 , wherein a first feed liquid chamber in a first stage and a second feed liquid chamber in an adjacent stage are both in fluid communication with an inlet of a first heat exchanger through feed chamber outlets; and
a first air gap in a first stage and a second air gap in an adjacent stage are both in fluid communication with an inlet of a second heat exchanger through air gap outlets.
17. The multi-stage distillation apparatus of claim 9 , wherein the TEM is powered by at least one source selected from the group consisting of solar photovoltaic module, wind power mill, geothermal power, and ocean/wave mill.
18. A process of distilling water, comprising:
feeding a liquid into the distillation apparatus of claim 1 through the hot block inlet and collecting distilled water from the permeate outlet.
19. The process of distilling water of claim 18 , wherein the liquid is at least one selected from the group consisting of salty water, ocean/sea water, rejected brine, wastewater, brackish water, flowback/produced water, fruit juices, blood, milk, dyes, and waste flows.