Sewage treatment plants with movable partition

Claim 1

A SEWAGE TREATMENT PLANT INCLUDING TANK MEANS FORMING A PLURALITY OF CHAMBERS INCLUDING A CONTACT AERATION ZONE, A CLARIFICATION ZONE, AND AN ACTIVATED SLUDGE RE-AERATION ZONE; INFLOW MEANS LEADING TO THE CONTACT AERATION ZONE FOR SUPPLYING RAW SEWAGE TO THE PLANT, SAID PLANT INCLUDING CONNECTING PASSAGE MEANS AND PUMP MEANS FOR CAUSING FLOW FROM THE CONTACT AREATION ZONE TO THE CLARIFICATION ZONE AND FROM THE LOWER PART OF THE CLARIFICATION ZONE TO THE RE-AERATION ZONE; ONE OF THE RE-AERATION ZONE TO THE CONTACT AERATION ZONE; ONE OF THE PARTITIONS OF SAID PLANT WHICH SEPARATES THE CONTACT AERATION ZONE FROM ANOTHER ZONE BEING A MOVABLE WALL, SAID WALL HAVING A FLEXIBLE SEAL AT ITS BOTTOM AND HAVING INFLATABLE SEALS ALONG ITS SIDES WITH VALVES FOR DEFLATING THE SEALS TO PERMIT MOVEMENT OF THE WALL, AND HANGER MEANS FOR SUPPORTING THE MOVABLE WALL AT A HEIGHT SUITABLE FOR POSITIONING THE FLEXIBLE SEAL IN FLEXED CONDITION ON THE TANK BOTTOM, SAID HANGER MEANS BEING UNOBSTRUCTED TO FACILITATE RAISING THE MOVABLE WALL TO RELIEVE THE PRESSURE ON THE BOTTOM SEAL AND TO FACILITATE MOVEMENT OF THE WALL.