Biofilter and method for filtering a waste liquid

Details Biofilter and method for filtering a waste liquid Biofilter and method for filtering a waste liquid

2006-03-31

2008-05-20

Upton, Christopher (Department: 1797)

Liquid purification or separation

Processes

Treatment by living organism

C210S617000, C210S630000, C210S150000, C210S188000

Reexamination Certificate

active

07374683

ABSTRACT:
The biofilter is used for the purification of a waste liquid using layers of filtering material, wherein the waste liquid moves downwardly by gravity while an O2-containing gas moves upwardly therein. The biofilter comprises a gas collector to capture at least a portion of the gas moving upwardly therein to mitigate the problem of biofilter clogging due to a microbial seal at the surface of the uppermost filtering layer.

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