Title:
OPTIMIZED SOFTENING METHOD OF ALKALI INDUSTRIAL WASTE WATER UNDER CO2 PRESSURE
Document Type and Number:
Japanese Patent JP2021053630
Kind Code:
A
Abstract:
To provide a treatment method of industrial waste water containing calcium for the purpose of removing the whole or a part of calcium from the industrial waste water.SOLUTION: In a treatment method of industrial waste water containing calcium, the waste water 10 to be treated is introduced to a zone equipped with a settling tank 12; a part of the waste water taken out at an outlet of the settlement tank, that is 3-25%, preferably 5-10% of a stream flown from the settling tank, and usually a part 13 taken out at the downstream of a high pressure pump 9 operated at a pressure of 8-10 bars, is split; at least one injection 15 of CO2 gas into a split stream is performed; a pH value of the split stream is lowered to 4-6.8, preferably 4.5-6,; and the treated split stream is returned to the initial waste water and reaches the a settling tank body in the settling tank.SELECTED DRAWING: Figure 3
More Like This:
Inventors:
BRUNO ALBAN
DOMINIQUE BRAS
PHILIPPE CAMPO
DOMINIQUE BRAS
PHILIPPE CAMPO
Application Number:
JP2020150396A
Publication Date:
April 08, 2021
Filing Date:
September 08, 2020
Export Citation:
Assignee:
AIR LIQUIDE
International Classes:
B01D21/30; B01D21/00; B01D21/24; C01F11/18; C02F1/58; C02F1/66
Attorney, Agent or Firm:
Mitsue Obuchi
Yukio Fuse
Yukio Fuse