Tragbares Gruppenfiltriergerät, insbesondere zur Gewinnung von genießbarem Wasser aus kontaminiertem Oberflächenwasser

摘要

The present invention "portable group filtration apparatus for obtaining drinking water from contaminated surface water, in particular a filtration unit comprising a hand pump, adaptor and disposable sterile filter therefor", relates to a treatment apparatus which permits improved clarifying and/or sterile filtration versus known pressure filtration systems having pneumatic piston displacement pumps and disposable filter holders having a membrane filter. In this case, risk-free filtration of A/B/C-contaminated surface waters is possible via a by-pass-free sterile filter holder. A special disposable filter holder having a membrane filter package is provided which has a high filter surface area and is exposed to a restricted filter pressure in such a way that water situated in a pretreatment vessel can be sucked in via a 3-way adaptor and can only be passed into the disposable filter below a filter pressure which is preset within a narrow pressure range. As soon as a filter pressure is established which is higher than the preset filter pressure, the water remaining upstream of the disposable filter flows back into the pretreatment vessel via an open check valve. If the threshold pressure determining the opening pressure of the check valve is undershot, the safety valve closes so that the contaminated water again flows through the disposable filter holder.