Liquid purification or separation – Particulate material type separator – e.g. – ion exchange or... – With rehabilitation means
Patent
1988-02-26
1990-05-08
Fisher, Richard V.
Liquid purification or separation
Particulate material type separator, e.g., ion exchange or...
With rehabilitation means
210289, 210293, 5230917, B01D 2324
Patent
active
049236067
ABSTRACT:
A precast concrete, plastic-jacketed filter underdrain block for downflow or upflow filter units is disclosed. The plastic jacket additionally functions as a mold for the concrete. The plastic molds become an integral part of the finished filter underdrain block. Thus, relatively lightweight, inexpensive plastic molds can be fabricated and shipped to the filter construction site where they are filled with concrete, cured, and then placed in the filter unit to provide an underdrain system. The underdrain blocks may be equipped with handholds to facilitate the handling and placement of the blocks in the filter vessel. The blocks may also be provided with alternating vertical rigs on the outside vertical surfaces of the plastic jacket which create an interlocking system whereby when installed in the filter unit each block is interconnected to its adjacent side blocks thereby creating a uniform interconnected filter underdrain system which resists the uplifting and displacement of individual blocks during backwashing operations.
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Brochure entitled "Deep-Bed Filter Systems" by Tetra Resources, Inc., 1986.
Gresh Richard D.
Netherland Robert B.
Fisher Richard V.
Lee Coreen Y.
Tetra Technologies
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