Slow sand filters

Details Slow sand filters Slow sand filters

1988-09-28

1990-03-27

Spear, Frank

Liquid purification or separation

With alarm, indicator, register, recorder, signal or...

Material level or thickness responsive

37 57, 37DIG19, 210106, 210271, B01D 2316

Patent

active

049118315

ABSTRACT:
The invention relates to an apparatus for cleaning a slow sand filter for a body of liquid while the liquid is in situ, in which there is a carrier adapted to traverse the body of liquid, and a device carried by the carrier and adapted to skim successive layers of sand from the filter. The carrier is a floatable vessel and the skimmer device is an auger. The skimmer device is controlled by depth control means which are automatically adjusted in response to the contour of the filter.

REFERENCES:
patent: 1617654 (1927-02-01), Sivade
patent: 2327726 (1943-08-01), Lose, Jr.
patent: 4005019 (1977-01-01), Parlette
patent: 4070978 (1978-01-01), Virgilo
patent: 4104813 (1978-08-01), Lindsey
patent: 4290890 (1981-09-01), Bauer
patent: 4291474 (1981-09-01), Schmidt
patent: 4413433 (1983-11-01), Duverne
patent: 4584784 (1986-04-01), Wolters et al.
patent: 4628623 (1986-12-01), Deal
patent: 4759138 (1988-07-01), Grinsted
The Harris Group of Companies Brochure, pp. 1-15.

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