Liquid purification or separation – With alarm – indicator – register – recorder – signal or... – Responsive to fluid flow
Patent
1974-12-13
1976-06-08
Hart, Charles N.
Liquid purification or separation
With alarm, indicator, register, recorder, signal or...
Responsive to fluid flow
210 28, 210 34, 210 35, 210265, 210275, B01D 1506, B01D 3700
Patent
active
039620786
ABSTRACT:
A method and apparatus reduces the amount of radioactive solids resulting from the filtration of particulate contaminants from liquid in a nuclear reactor plant. A filtration system includes a pre-filter comprising a sheet filter medium through which the reactor liquid passes to remove relatively large particulate contaminants for storage or disposal. The reactor liquid is then passed through a bed of granular filter medium to accumulate substantially all the previously non-filtered contaminants and thereby provide a clarified liquid suitable for reuse in the reactor. Backwash liquid is flowed through the granular filter bed to remove and entrain the accumulated contaminants into a slurry which is received by a reservoir where the slurry is maintained quiescently to settle the contaminants. Removal of liquid from the reservoir concentrates the contaminants for storage or further processing, without the necessity of large quantities of filter aids that would increase the quantity of storage-requiring contaminated solids.
REFERENCES:
patent: 2867324 (1959-01-01), Hirs
patent: 3630892 (1971-12-01), Hirs et al.
patent: 3697419 (1972-10-01), Grant
patent: 3773177 (1973-11-01), Queiser et al.
Hart Charles N.
Hydromation Filter Company
Spitzer Robert H.
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