Method and apparatus for the purification of ground water

Details Method and apparatus for the purification of ground water Method and apparatus for the purification of ground water

2004-08-06

2008-10-21

Barry, Chester T (Department: 1797)

Liquid purification or separation

Processes

Treatment by living organism

C210S170070, C210S760000, C166S246000

Reexamination Certificate

active

07438814

ABSTRACT:
The present invention relates to a method for decreasing the contents of metals, metalloids, nitrate and nitrite, respectively, in raw water flowing through a basin (1), whereby water containing either oxygen, oxygen-releasing substances, metabolic reactions of naturally occurring micro-organisms or containing denitrification organisms and/or substrates therefore is intermittently introduced to the basin (1) through a number of satellite wells (2) arranged around at least one extraction well (3) for purified water. Water containing oxygen and/or oxygen-releasing substances or metabolic reactions of naturally occurring micro-organisms or denitrification organisms and/or substrates therefore is homogeneously distributed vertically in said basin (1), whereby the water to be purified is fed into the basin by horizontally arranged feeding pipes (5) and that the extraction of purified water from said at least extraction well (3) is such that a substantially negative pressure is created around said at least one extraction well (3). The invention relates also to an apparatus for carrying out the method and to a satellite well to be used in the apparatus.

REFERENCES:
patent: 3649533 (1972-03-01), Reijonen et al.
patent: 4683064 (1987-07-01), Hallberg et al.
patent: 4755304 (1988-07-01), Hallberg et al.
patent: 5325795 (1994-07-01), Nelson et al.
patent: 2004/0126190 (2004-07-01), Stegemeier et al.
patent: 2005/0189108 (2005-09-01), Davidson
patent: 0 928 642 (1999-07-01), None

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