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Title:
METHOD FOR TREATING WASTEWATER ON SHIP AND APPARATUS THEREFOR
Document Type and Number:
Japanese Patent JP2005144449
Kind Code:
A
Abstract:

To provide a method for treating wastewater on a ship in which a biological treatment process is carried out utilizing a space on the ship to a possible full extent and in which simultaneously nitrate is removed from the treated wastewater and the amount of sludge produced is remarkably reduced.

The method for treating the wastewater on the ship comprises processes as follows: the wastewater is pretreated via filtering; the pretreated wastewater is then collected into a first vessel used as a mixing tank with oxygen optionally added thereto; the wastewater is continuously supplied from the first tank to a three-stage bioreactor and aerobically treated in a second tank; the wastewater is next transferred in a batch from the second tank to a third closed tank wherein a denitrification and sedimentation treatment of solid matters is carried out; the wastewater is supplied from the third tank to a fourth tank used as a sedimentation tank, while most of the sludge is circulated in a batch from the third tank to the first tank; and the water from the fourth tank is subjected to a fine-filtering process after sterilization.


Inventors:
HAMANN KNUD
HAMANN HOLGER
Application Number:
JP2004000326494
Publication Date:
June 09, 2005
Filing Date:
November 10, 2004
Export Citation:
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Assignee:
HAMANN AG
International Classes:
B63J4/00; B63B17/00; B63B29/16; B63J99/00; C02F1/44; C02F1/50; C02F1/52; C02F3/02; C02F3/12; C02F3/34; C02F9/00; (IPC1-7): C02F3/34; B63J4/00; C02F1/44; C02F1/50; C02F1/52; C02F3/12; C02F9/00
Domestic Patent References:
JPS4859356U1973-07-27
JPS50108260U1975-09-04
JPS50121991A1975-09-25
JPS5454452A1979-04-28
JP2002362493A2002-12-18
JP2004008984A2004-01-15
JPS4859356U1973-07-27
JPS50108260U1975-09-04
JPS50121991A1975-09-25
JPS5454452A1979-04-28
JP2002362493A2002-12-18
JP2004008984A2004-01-15
Foreign References:
DE19749699A11999-04-29
DE19749699A11999-04-29
Attorney, Agent or Firm:
杉谷 勉