C - Chemistry – Metallurgy – 02 – F
Patent
C - Chemistry, Metallurgy
02
F
362/1
C02F 3/32 (2006.01) C02F 3/06 (2006.01)
Patent
CA 1304175
ABSTRACT OF THE DISCLOSURE The filter bed containing aquatic plants planted therein is provided with a lengthwise and/or transverse drainage arrangement containing a predetermined number of drain pipes. Particularly during the growth phase of the aquatic plants, the drainage arrangement constitutes a by-pass flow path by-passing the aquatic plant-containing filter bed. The throughflow through such by-pass flow path is controlled as a function of the operating conditions using adjustable control devices. Furthermore and in order to also control the hydromorphous conditions of the aquatic plant-containing filter bed, outfeed level control devices are provided for controlling the hydraulic gradient along substantially the entire aquatic plant-containing filter bed as a function of its operating conditions. The throughflow through. the aquatic plant-containing. filter bed thus can be controlled for achieving optimum purifica- tion of the inflowing liquid under substantially all occurring operating conditions.
535520
Kickuth Reinhold
Riches Mckenzie & Herbert Llp
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