Liquid purification or separation – Flow – fluid pressure or material level – responsive – Discharge of treated material
Patent
1987-03-26
1989-08-08
Wyse, Tom
Liquid purification or separation
Flow, fluid pressure or material level, responsive
Discharge of treated material
210134, 210150, 210170, 210251, C02F 332
Patent
active
048550400
ABSTRACT:
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 purification of the inflowing liquid under substantially all occurring operating conditions.
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"Report of a Visit by Arthur G. Boon, Dr. Robert D. Davis and Dr. Robert J. Huggins to Germany (GFR) to Investigate the Root Zone Method" by A. G. Boon, R. D. Davis and R. J. Huggins, Jan., 1985.
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