Process for the treatment of liquid effluents by activated sludg

Details Process for the treatment of liquid effluents by activated sludg Process for the treatment of liquid effluents by activated sludg

1995-06-01

1997-07-01

Hruskoci, Peter A.

Liquid purification or separation

Processes

Treatment by living organism

210616, 210623, 210631, 210903, C02F 330, C02F 312

Patent

active

056434537

ABSTRACT:
Process for the treatment of liquid effluents, such as waste water, for the purpose of removal of carbon, nitrogen and phosphorus pollution using an activated sludge, according to which the effluent, after having been subjected to mechanical pretreatments, is brought into contact with the activated sludge. The effluent/activated sludge mixture is the subjected to clarification/settling in order to separate the treated water from the thickened sludge, the latter then being recycled at the head of the aeration treatment and the excess sludge being continuously discharged. An inert material of inorganic origin is injected into the activated sludge, this material being immediately and homogeneously dispersed in the activated sludge, in order to create a mixed culture containing both, and in a single bacterial floc, free heterotrophic species and autotrophic species partially fixed on the particles of the said material within the floc. The structure of the latter contains in the order of 40 to 65% of organic matter, the remainder being the said inert material, consisting of one or a number of particles of the said material surrounded by activated sludge. The extraction of the excess sludge is carried out continuously and without separation of the injected material.

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patent: 4221657 (1980-09-01), Lebesgue
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patent: 4731185 (1988-03-01), Chen et al.
patent: 4786413 (1988-11-01), Reimann et al.
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Websters II New Riverside University Dictionary, 1994.

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