Syphon arrangement suitable for dosing a filter in a sewage treatment plant

摘要

In a dosing system for sewage or other liquid consisting of one or more syphons delivering liquid to or withdrawing liquid from a chamber, the syphons are primed and broken by the controlled operation of valves which connect the syphon to a source of vacuum or admit air. A syphon arrangement, for example for dosing a filter in a sewage treatment plant, has a chamber 43 to which a syphon 42 delivers and from which a syphon 46 withdraws. The syphons 42, 46 are connected to an exhauster 44 for priming, and a control unit 45 controls the operation of valves 51, 52 to control the priming and breaking of the syphons. In another arrangement a syphon has two air inlet pipes having inlets at different levels and a unit controls the operation of one inlet pipe and the priming and breaking of the syphon. IMAGE