Liquid purification or separation – Processes – Making an insoluble substance or accreting suspended...
Patent
1990-12-06
1992-07-14
Wyse, Thomas
Liquid purification or separation
Processes
Making an insoluble substance or accreting suspended...
210793, 210807, C02F 124
Patent
active
051300290
ABSTRACT:
Method for purifying a liquid from solid and liquid impurities by flotation-filtration in which the dirt flocks in the liquid to be purified are separated from the liquid to be purified after which they are led to the top of the liquid to form a sludge bed 16 from there to continue out to a sludge canal 17 and to a drain. The purified liquid flows further through a sand filter 18 to an isolated space 20 under the filter, through filter nozzles 19 and from there further through a pipe system 23, to, for example, a pure water reservoir. The filter is washed in an upstream direction by an opposite water flow. The sludge canal which also works as a rinsing water canal (17) or only as a rinsing water canal and the rinsing water canal (22) are placed on different sides of the filtration apparatus and only the canal that works as a rinsing water canal (22) is situated behind the separation canal (12) which means that the rinsing water has to flow over the separation canal (12).
REFERENCES:
patent: 3506125 (1970-04-01), Willis et al.
patent: 3769207 (1973-10-01), Baer
patent: 3997970 (1976-08-01), Willis et al.
patent: 4618430 (1986-10-01), Farret, Jr. et al.
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