Internally fed drum filter for treating waste water comprising an inlet distribution arrangement

1. An internally fed drum filter for treating waste water, comprising:

an inlet distribution arrangement for distributing waste water entering the drum filter via an inlet duct, the inlet distribution arrangement comprising a flow deflection member arranged near an outflow opening of the inlet duct, downstream thereof, for adjusting the flow characteristics of waste water entering the drum filter via the inlet duct,

wherein the flow deflection member is connected to an underside of the inlet duct by a hinge that allows rotation of the flow deflection member from and towards the outflow opening of the inlet duct, the flow deflection member having a flow deflection surface for deflecting an incoming flow from the inlet, the flow deflection surface extending upwardly from below a lower edge of the outflow opening of the inlet duct, and

wherein the flow deflection member is upwardly inclined, and wherein an angle of the upwardly inclined flow deflection member with respect to a centre line of the inlet duct is adjustable within a range of 5°-50° by rotation of the flow deflection member.

2. The drum filter according to claim 1 , wherein an orientation and/or position of the flow deflection member is adjustable so that an incoming flow is essentially divided into two flows directed at sides of the drum filter.

3. The drum filter according to claim 1 , wherein the flow deflection surface is bent or curved in a plane perpendicular to a longitudinal direction of the flow deflection member, wherein a convex side of the bent or curved flow deflection surface is facing the outflow opening.

4. The drum filter according to claim 1 , wherein the flow deflection member is a plate.

5. The drum filter according to claim 1 , wherein the flow deflection member has a V-shaped cross-section resulting in the flow deflection member to have a sharp edge and two flanges connecting in the sharp edge, wherein the sharp edge of the V-shaped section substantially faces the outflow opening.

6. The drum filter according to claim 1 , wherein adjustment of the flow deflection member can be achieved by moving one or more actuators connected to the flow deflection member, wherein the one or more actuators can be activated by being connected to an outside actuator situated outside an inlet end of the drum filter.

7. The drum filter according to claim 6 , wherein the one or more actuators are substantially arranged close to an underside of the inlet duct and extend parallel thereto.

8. The drum filter according to claim 6 , wherein the one or more actuators comprise a rod and/or a thread.

9. The drum filter according to claim 5 , wherein an angle of the flanges of the V-shaped flow deflection member is 80°-160°.

10. The drum filter according to claim 5 , wherein said V-shaped flow deflection member has a length, wherein a width of the flanges of the V-shaped flow deflection member increases along said length.

11. The drum filter according to claim 7 , wherein the one or more actuators comprise a rod and/or a thread.

12. The drum filter according to claim 6 , wherein the flow deflection member has a V-shaped cross-section resulting in the flow deflection member to have a sharp edge and two flanges connecting in the sharp edge, wherein the sharp edge of the V-shaped section substantially faces the outflow opening, wherein an angle between the flanges of the V-shaped flow deflection member is 80°-160°.

13. The drum filter according to claim 6 , wherein the flow deflection member has a V-shape and a flange width of the V-shaped flow deflection member increases along a length thereof.

14. The drum filter according to claim 5 , wherein an angle of the flanges of the V-shaped flow deflection member is around 120°.

15. The drum filter according to claim 6 , wherein the flow deflection member has a V-shaped cross-section resulting in the flow deflection member to have a sharp edge and two flanges connecting in the sharp edge, wherein the sharp edge of the V-shaped section substantially faces the outflow opening, wherein an angle between the flanges of the V-shaped flow deflection member is around 120°.

16. An internally fed drum filter for treating waste water, comprising:

an inlet duct;

an outflow opening of the inlet duct;

an upwardly inclined flow deflection member arranged near the outflow opening, for adjusting the flow characteristics of waste water entering the drum filter via the inlet duct, an angle of the upwardly inclined flow deflection member with respect to a centre line of the inlet duct is adjustable within a range of 5°-50° by rotation of the flow deflection member;

a hinge that allows rotation of the upwardly inclined flow deflection member, the hinge connecting the flow deflection member to an underside of the inlet duct so as to allow rotation of the flow deflection member from and towards the outflow opening of the inlet duct, the flow deflection member having a flow deflection surface for deflecting an incoming flow from the inlet, the flow deflection surface extending upwardly from below a lower edge of the outflow opening of the inlet duct; and

an activator connected to the upwardly inclined flow deflection member, the activator comprising a rod that projects through a separation wall.

17. The drum filter according to claim 16 , wherein the activator automatically adjusts the angle of the upwardly inclined flow deflection member based on water level in the drum filter.