Method and apparatus for purifying untreated water

Details Method and apparatus for purifying untreated water Method and apparatus for purifying untreated water

2005-02-08

2005-02-08

Barry, Chester T. (Department: 1724)

Liquid purification or separation

Processes

Treatment by living organism

C210S151000, C210S739000, C210S741000, C210S138000

Reexamination Certificate

active

06852228

ABSTRACT:
The invention relates to the purification of untreated water which is polluted with dissolved organic carbon compounds which can be biologically or adsorptively removed in a three-step process, whereby the upstream purification step is predominantly biological, i.e. operates as a biofilter (1), and both subsequent purification steps are predominantly adsorptive in nature, i.e. operate as adsorbers (2, 3). The biofilter (1) is purified by backwashing, whereby the backwashing periods occur according to the TOC determined between the biofilter (1) and the upstream adsorber (2) and/or running time and/or pressure loss. The upstream adsorber (2) is also cleaned by backwashing and is subsequently shifted into a downstream position alternating with the other adsorber (3). The method is suitable for obtaining TOC concentrations in treated water of less than 500 ppb.

REFERENCES:
patent: 3779909 (1973-12-01), Wisfeld et al.
patent: H1337 (1994-07-01), Hoeppel
patent: 5885459 (1999-03-01), Lerche et al.
patent: 43 08 159 (1994-09-01), None
patent: 19512907 (1996-06-01), None
patent: 19524093 (1997-01-01), None
patent: 19712737 (1998-10-01), None
patent: 0607019 (1994-07-01), None
patent: 0903324 (1999-03-01), None
JP 0-5161896, Patent Abstracts of Japan, Jun. 29, 1993.
Article, Heft 27 VO, . . . “Neuere Erkenntnisse üver die Adsorption in Aktivkohlefiltern”.

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