Method for the biological purification of wastewater
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United States of America Patent
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May 24, 1994
Grant Date -
N/A
app pub date -
Mar 13, 1992
filing date -
Mar 15, 1991
priority date (Note) -
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Abstract
The water to be treated is sent in a co-current with oxygenated gas into an upflow reactor with a fixed bed of particles, and the bacteria support medium used comprises particles with a bulk density of 35 to 65 kg/m.sup.3. The reactor or biological filter (or reactors or biological filters in series) comprises or comprise: a zone for the densification of sludges; at least one oxygenated gas injection device; a zone of filtering material, a retention ceiling and a washing water storage zone with removal of the treated effluent. Application to the treatment of wastewater and water to be made fit for drinking purposes.
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