Patent AT-503071-B1 (AT)
Title: Sewage treatment plant comprises a clarifying basin having an under-gravel filter, an equipment having an intermediate tank for a batch-wise feeding of the clarifying basin, a waste water reservoir, a feed pipe, and pipe fitting
IPC: B01D21/02
Filed: 2006-12-04
Granted: 2008-04-15
Abstract: The sewage treatment plant comprises a clarifying basin having an under-gravel filter, and equipment having an intermediate tank for a batch-wise feeding of the clarifying basin. The clarifying basin is fed by a feed pipe (20) from a waste water reservoir, which is designed as a preliminary clarifying basin. The inlet component of a transfer pipe (12) is designed as a lever with an inverted U-shaped element (11). The outlet side of the transfer pipe that is connected with the inverted U-shaped element has a pipe fitting (15), which can be tilted up and down in perpendicular manner. The sewage treatment plant comprises a clarifying basin having an under-gravel filter, and equipment having an intermediate tank for a batch-wise feeding of the clarifying basin. The clarifying basin is fed by a feed pipe (20) from a waste water reservoir, which is designed as a preliminary clarifying basin. The inlet component of a transfer pipe (12) is designed as a lever with an inverted U-shaped element (11). The outlet side of the transfer pipe that is connected with the inverted U-shaped element has a pipe fitting (15), which can be tilted up and down in an essentially perpendicular manner and whose outlet ending is held diagonally upwards due to application of force in the case of the pipe fitting not being filled with waste water and can be tilted diagonally downwards against the upwardly-acting force in the case of the pipe fitting being filled with waste water. The feed pipe to the clarifying basin is led through the wall and/or the floor of the intermediate tank, which is partitioned by a dividing wall, through which the transfer pipe is arranged to form a waste water collection segment that contains the inverted U-shaped element, and a feed segment (102) that contains the tiltable pipe fitting. The application of force for holding the pipe fitting in a diagonally upward position in the case of not being filled with waste water and in a diagonally downward position in the case of being filled with waste water from the waste water collection segment takes place by a rope-driven pulley with counter-weight. The pipe fitting is arranged with the outlet ending between two perpendicularly running guide rails and/or ropes to allow an upward and downward tilting and is made of a rigid pipe that is connected with the transfer pipe by a swivel joint. The swivel joint is formed with a pipe or flexible tube-like shape that is made of an elastic material. The guide rails and/or guide ropes for the pipe fitting are made of stainless steel. The waste water collection segment is partitioned into two separate chambers, to which waste water can be alternately fed. The lever with the inverted U-shaped element is connected with an upwardly and downwardly tiltable pipe fitting in the feed segment by a transfer pipe that penetrates through the dividing wall that partitions the waste water collection segment. The feed pipe flows into a multi-axial or radially symmetric distribution head, which is placed at the centre of the clarifying basin just above or on its floor and has a multitude of dividing walls that extend radially from the central inlet region of the feed pipe towards the outside. The mentioned dividing walls laterally demarcate sector-like distribution chambers, from each of which, an outlet pipe fitting that passes through the lateral wall of the distribution head radially protrudes outwards. The floor is designed like a truncated cone, radially protruding outward or to its lateral wall and to the outlet pipe fitting in an inclined manner. Drainage pipes are connected to the outlet pipe fitting and lie on the floor of the clarifying basin or held diagonally upward above the floor by supports. The drainage pipes possess outlet openings, which are made to point towards the floor of the mentioned clarifying basin and end in impact plates for a local and complete distribution of the waste water. The outlet pipes have sun wheel-like or radially and spirally curved profile. The floor of the clarifying basin is designed from the distribution head to the lateral wall of the clarifying basin like a truncated cone in a downwardly sloping manner. The radially outward and downwardly sloping profile of the outlet pipes is ensured using supports, whose height can be adjusted.