Recirculation shower for aircraft

1. A system for water purification for a recirculation shower in an aircraft, with the system comprising:

a filtration unit adapted to filter a used shower water;

a first backwash line that is adapted to clear the filtration unit with backwashing and convey backwash water to the filtration unit;

a second backwash line adapted to clear the filtration unit with backwashing and discharge backwash water from the filtration unit, the second backwash line in communication with a storage tank; and

an air check valve in communication with the storage tank that drains the backwash water to an exterior atmosphere surrounding the aircraft or to a container of the aircraft after backwashing.

2. The system of claim 1 , wherein the filtration unit is a microfiltration unit, and the filtration unit is separate from the storage tank.

3. The system of claim 1 , wherein the filtration unit is an ultrafiltration unit.

4. The system of claim 1 , further comprising:

a freshwater feed unit that feeds freshwater to supply the recirculation shower with water and is in communication with the first backwash line to feed backwash water for backwashing; and

a control unit that is adapted to control the freshwater feed unit.

5. The system of claim 4 , wherein the control unit is adapted to control water supply through the freshwater feed unit at least based partially on a shower water flow through the filtration unit.

6. The system of claim 4 , wherein the control unit is designed as a control valve.

7. The system of claim 4 , further comprising:

a nonreturn valve that is adapted to prevent dirt build-up on the freshwater feed unit;

a freshwater shut-off valve that is adapted to the prevent dirt build-up on the freshwater feed unit; and

a shut-off valve that is adapted to block freshwater feed to the system if backwashing is triggered.

8. The system of claim 1 , further comprising:

a detection unit that is adapted to determine a malfunction in the filtration unit and trigger backwashing based at least partially on the malfunction of the filtration unit.

9. A system of claim 8 , wherein the detection unit is designed as a pressure sensor and adapted to determine a differential pressure from a first pressure (p 1 ) upstream of the filtration unit and a second pressure (p 2 ) downstream of the filtration unit;

wherein the pressure sensor is adapted to trigger backwashing when a threshold value has been reached.

10. The system of claim 9 , wherein the threshold value is a threshold value of the differential pressure.

11. The system of claim 9 , wherein the threshold value is a threshold value of a loss of volume flow in the filtration unit determined from the differential pressure.

12. The system of claim 1 , further comprising:

a backwash valve that is designed as a three-way valve and adapted to set a backwash position during backwashing; and

a disinfection unit that disinfects the shower water after filtration of the shower water through the filtration unit, receives a disinfectant by way of the backwash valve, and disinfects the shower water with the disinfectant.

13. The system of claim 1 , further comprising:

a pre-filtration unit that is adapted for first filtration of the shower water of the recirculation shower; and

an after-treatment unit is adapted for after-treatment of the shower water,

wherein the storage tank includes a refrigeration unit to bring about a particular temperature of the shower water after the first filtration and is adapted to hold a cleaning agent for use in backwashing the system.

14. The system of claim 1 further comprising:

a refrigeration unit that is adapted to bring about a particular temperature of the used shower water prior to filtering the shower water by the filtration unit

wherein the refrigeration unit in communication with the storage tank.

15. A transport; comprising:

a monument that comprises a recirculation shower,

a system for water purification for the recirculation shower, the system comprising:

a filtration unit adapted to filter a used shower water;

a first backwash line that is adapted to clear the filtration unit with backwashing and conveys backwash water to the filtration unit;

a second backwash line adapted to clear the filtration unit with backwashing and discharge backwash water from the filtration unit, the second backwash line in communication with a storage tank; and

an air check valve in communication with the storage tank that drains the backwash water to an exterior atmosphere of the transport or to a container of the transport after backwashing.

16. The transport of claim 15 , wherein the transport is an aero plane.

17. A method for water purification for a recirculation shower in an aircraft, the method comprising:

filtering used shower water through a filtration unit;

conveying backwash water to the filtration unit through a first backwash line;

cleaning the filtration unit by backwashing through the first backwash line and through a second backwash line;

discharging backwash water from the filtration unit through the second backwash line into a storage tank; and

draining the backwash water from the storage tank via an air check valve to an exterior atmosphere surrounding the aircraft or to a container of the aircraft after backwashing.

18. The method of claim 17 , further comprising:

feeding freshwater for supply of water to the recirculation shower;

feeding backwash water for backwashing through a freshwater feed unit; and

controlling water supply through the freshwater feed unit by a control unit.

19. The method of claim 18 , further comprising:

determining a malfunction of the filtration unit with a detection unit; and

triggering backwashing based at least in part on the malfunction of the filtration unit with the detection unit.