Title:
【発明の名称】汚水処理装置
Document Type and Number:
Japanese Patent JP2637809
Kind Code:
B2
Abstract:
PCT No. PCT/GB88/00434 Sec. 371 Date Jan. 22, 1990 Sec. 102(e) Date Jan. 22, 1990 PCT Filed Jun. 2, 1988 PCT Pub. No. WO88/09740 PCT Pub. Date Dec. 15, 1988.A sewage treatment plant for use aboard ship comprises a vacuum assisted fresh water flush system delivering sewage to a collection tank. Sewage is collected from the collection tank in batches for treatment. The sewage first enters a settlement tank and is then transferred to an aeration tank. After aeration, treated sewage is then transferred out in batches. The batch processing overcomes the difficulties of operating a continuous flow arrangement on a moving platform where liquid can move back and forth, which presents difficulties in controlling the level of biological activity. A controlled amount of sewage transferred to the aeration tank is diluted with grey water. A sludge storage tank is provided and suspended solids probes are provided in the aeration and settlement tanks such that sludge is automatically withdrawn from these tanks to the storage tank to maintain the level of suspended solids within predetermined limits. The sludge storage tank is provided with aerators and its temperature is controlled such that aerobic digestion renders the sludge inert. Small batches of aerated liquid are drawn from the aeration tank into a chlorination tank via a separation system at controlled intervals between successive sewage batch transfers from the collection tank to the aeration tank via the settling tank prior to discharge from the plant.
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Inventors:
RIJITSUTO PIITAA JON
FURIIMAN DEREKU JERAMII
KUUPAA HOORU FUREDERITSUKU
FURIIMAN DEREKU JERAMII
KUUPAA HOORU FUREDERITSUKU
Application Number:
JP50471688A
Publication Date:
August 06, 1997
Filing Date:
June 02, 1988
Export Citation:
Assignee:
IGIRISU
International Classes:
B63B17/00; B63J4/00; C02F1/52; C02F3/00; C02F3/12; B63B29/16; C02F9/00; (IPC1-7): C02F9/00; B63B29/16; C02F1/52; C02F3/12; C02F9/00
Attorney, Agent or Firm:
Yoshio Kawaguchi (2 outside)