US 7,442,307 B2Granted

Method and apparatus for the biological activated sludge treatment of wastewater

AssigneeOrganica Kornyezettechnologiak Zet.

InventorsGyula Czepek, Zoltán Takács, István Kenyeres

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Abstract

The equipment has a main reaction (I) and an anterior reactor (II), as well as facilities for feeding in untreated sewage, removing cleaned water and sludge and aerating the wastewater entered into the main reactor, and a mixer (2) situated in the anterior reactor (II), and it is characterized by that between the main reactor (I) and the anterior reactor (II) there is a facility or there are facilitates for the recirculation of wastewater. In the course of the procedure, between the anterior reactor (II) and the main reactor (I) the waste-water aerated in the latter reactor and mechanically stirred in the former reactor is recirculated, and so the transformation of the nitrogen content of the biologically decomposable pollutants by nitrification takes place in the main reactor, while the biological elimination of the nitrates created in the course of the nitrification (denitrification) takes place in the anterior reactor, and as a result of the anaerobic processes biological phosphorus elimination is also ensured (FIG. 1).

Claims20

Dependent claims

Equipment for the treatment of waste-water containing organic pollutants, comprising:

a main reactor;
an anterior reactor;
and
means for feeding in untreated sewage, removing cleaned water and sludge, and aerating waste-water entered into the main reactor;
said anterior reactor including a mixer;
the main reactor and the anterior reactor being separated from each other by a partition wall;
said equipment further comprising at least one device between the main reactor and the anterior reactor for recirculation of waste-water;
said at least one device having a U-shaped pipe-piece providing arms for the recirculation, one arm of the U-shaped pipe-piece being situated in the anterior reactor, another arm of the U-shaped pipe-piece being situated in the main reactor;
said partition wall separating a lower end of said one arm and a lower end of said another arm, said lower end of said one arm and said lower end of said another arm being connected by a pipe passing through said partition wall;
an upper end of said one arm and an upper end of said another arm being situated at a height corresponding to a minimum water-level as determined in the main and aeration reactors;
wherein an air-pipe with an end-fitting ensuring airlift function is connected to said another arm of the U-shaped pipe-piece situated in the main reactor;
and
wherein there is a transfer opening, disposed in the partition wall a certain distance from the lower end of said one arm and the lower end of said another arm, for ensuring the recirculation.

10 more elements

A method for biological activated sludge treatment of waste-water containing organic pollutants, comprising:

a filling phase in which a main reactor and an anterior reactor are filled from a minimum level to a maximum level with untreated sewage first taken into a lower range of a sludge mass situated in the anterior reactor, and then taken from the anterior reactor to the main reactor, water situated in the main reactor being aerated;
a reaction phase in which nitrification-denitrification reaction takes place, the water situated in the main reactor being aerated, and water situated in the anterior reactor being stirred, practically mechanically, while the waste-water is recirculated between the main and anterior reactors;
a settling phase in which sludge is settled from the waste-water treated as above;
and
a draining phase in which treated sewage is drained by decanting in such a way that water levels in the main and anterior reactors are reduced to a minimum level and excess sludge is removed from the main and anterior reactors;
wherein the filling phase comprises using a U-shaped pipe-piece to transfer untreated waste-water from the anterior reactor to the main reactor.

3 more elements

A method for biological activated sludge treatment of waste-water containing organic pollutants, comprising:

a filling phase in which a main reactor and an anterior reactor are filled from a minimum level to a maximum level with untreated sewage first taken into a lower range of a sludge mass situated in the anterior reactor, and then taken from the anterior reactor to the main reactor, water situated in the main reactor being aerated;
a reaction phase in which nitrification-denitrification reaction takes place, the water situated in the main reactor being aerated, and water situated in the anterior reactor being stirred, practically mechanically, while the waste-water is recirculated between the main and anterior reactors;
a settling phase in which sludge is settled from the waste-water treated as above;
and
a draining phase in which treated sewage is drained by decanting in such a way that water levels in the main and anterior reactors are reduced to a minimum level and excess sludge is removed from the main and anterior reactors;
wherein the reaction phase comprises blowing air through an air-pipe in an arm of a U-shaped pipe-piece in the main reactor, thereby using the U-shaped pipe-piece as an airlift, a part of liquid in the anterior reactor being sucked through the U-shaped pipe-piece into the main reactor, a level of liquid in the main reactor being forced above a level of a transfer opening, an amount of the liquid in the main reactor exceeding the level of the transfer opening passing through the transfer opening back to the anterior reactor, whereby recirculation takes place.

3 more elements

Dependencies are inferred from the claim text.

Facts

Application: 10/590,072Filed 16 Feb 2005
Priority: HU 040045320 Feb 2004
Published: US 2007/0176890 A12 Aug 2007
Granted: 28 Oct 2008
Term ends: Not estimatedThe source records don’t support an estimate.

Classification7 codes

C02F 3/1263
Particular type of activated sludge installations: sequencing batch reactors [SBR]
C02F 3/308
Aerobic and anaerobic processes: biological phosphorus removal
C02F 3/327
Characterised by the animals or plants used, e.g. algae: characterised by animals and plants
C02F 2209/22
Controlling or monitoring parameters in water treatment: o2