Title:
【発明の名称】排水の処理方法
Document Type and Number:
Japanese Patent JP2912226
Kind Code:
B2
Abstract:
The invention relates to the treatment of waste water containing a harmful ion such as a heavy metal ion by the coagulating sedimentation method using an inorganic coagulant such as an iron compound or an aluminum compound. After separating treated water from the sediment (sludge) in which the harmful ion is incorporated in insoluble form, the pH of a mixture of the sediment and water is suitably adjusted to cause elution of the harmful ion from the sediment. Then the sediment is separated from the eluate and reused as an inorganic coagulant. By reusing the sediment in this manner, the waste water treatment is accomplished without producing a large quantity of sludge and the consumption of inorganic coagulant and auxiliary chemicals can be greatly reduced, while the concentration of the harmful ion in the treated water becomes sufficiently low.
Inventors:
IKEDA KENICHI
ASAI JUICHI
ARAI JUSHI
ASAI JUICHI
ARAI JUSHI
Application Number:
JP9724896A
Publication Date:
June 28, 1999
Filing Date:
April 19, 1996
Export Citation:
Assignee:
NIPPON DENKI KANKYO ENJINIARINGU KK
International Classes:
B01D21/01; C02F1/52; C02F1/56; C02F1/58; C02F1/62; C02F1/66; C02F9/00; (IPC1-7): C02F1/52; C02F1/52; B01D21/01; C02F1/58; C02F1/62
Domestic Patent References:
| JP4100591A | ||||
| JP4931146A | ||||
| JP5535994B2 |
Attorney, Agent or Firm:
Naoki Kyomoto (2 outside)