Title:
EFFLUENT TREATMENT METHOD
Document Type and Number:
WIPO Patent Application WO/2015/137300
Kind Code:
A1
Abstract:
The purpose of the present invention is to provide an effluent treatment method by a magnetic activated sludge process, with which an excessive increase in sludge in a biological treatment tank is suppressed, a discharged amount of magnetic powder discharged to outside the system along with sludge withdrawal is reduced, and operation with reduced running costs becomes possible. Provided is an effluent treatment method in which effluent including organic matter is introduced into a treatment tank (1) and the effluent is biotreated by activated sludge in the treatment tank (1), wherein the method comprises: adding a magnetic powder to the water being treated in the treatment tank (1) and causing domination by a microorganism belonging to the Bacillus or Geobacillus genus as microbial flora; adding a micronutrient salt required by the microorganism in an added amount proportional to the organic matter concentration (mg/L) and inflow amount of the effluent introduced to the treatment tank or proportional to the inflow amount of the effluent; using a magnetic separation means (4) to cause magnetism to act on the treated water after biotreatment; solid-liquid separating the magnetic powder and the sludge, to which the magnetic powder has bonded, from the treated water using the magnetic force; and returning to the treatment tank (1) all or a part of the solid-liquid separated magnetic powder and sludge to which the magnetic powder has bonded.
Inventors:
HANAI YOSUKE (JP)
NAKADA EIJU (JP)
NAKADA EIJU (JP)
Application Number:
PCT/JP2015/056921
Publication Date:
September 17, 2015
Filing Date:
March 10, 2015
Export Citation:
Assignee:
FUJI ELECTRIC CO LTD (JP)
International Classes:
C02F3/12; B03C1/00; C02F3/00; C02F3/34
Domestic Patent References:
| WO2011136188A1 | 2011-11-03 |
Foreign References:
| JPH08252594A | 1996-10-01 | |||
| JPH11244886A | 1999-09-14 | |||
| JPS6359759B2 | 1988-11-21 | |||
| JP2004275960A | 2004-10-07 | |||
| JP2002263684A | 2002-09-17 |
Attorney, Agent or Firm:
MATSUI Shigeru et al. (JP)
Shigeru Matsui (JP)
Shigeru Matsui (JP)
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