METHOD FOR REMOVING POLYAMINE CHERATING AGENT FROM AQUEOUS SOLUTION

Japanese Patent JP3266872

B2

PROBLEM TO BE SOLVED: To remove a polyamine chelating agent by oxidizing the polyamine chelating agent by oxygen in the presence of almost equivalent weight of transition metal and next biologically reducing the chelate in the presence of an electron donor.
SOLUTION: A reactor 1 is an oxidizing reactor to which waste water 4 containing a chelating agent, transition metal 5, and oxygen 6 are fed. The chelating agent forms a complex together with the metal, and this complex is decomposed by the oxygen. A reactor 2 is a bioreactor, and there, the metal and the metal complex are biologically reduced, and the reduced metal is returned to the oxidizing reactor 1 through a conduit 8. The electron donor is fed through a conduit 9, and a separator 3 separates the metal complex discharged from the bioreactor from purified waste water 12. In this way, the polyamine base chelating agent is reacted with transition metal such as iron and the formed complex is oxidized, and next, the oxide is reduced by denitrification bacteria or sulfate reduction bacteria, thereby decomposing an removing the chelating agent.

Aubema, Huybe Lauld
Beisman, Sees Jean Nico

JP8404899A

March 18, 2002

March 26, 1999

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Pakues Biosystems Besloten Fennaught Shap

C02F1/44; C02F1/74; C02F3/12; C02F3/28; C02F3/34; C02F9/00; (IPC1-7): C02F3/28; C02F1/44; C02F1/74; C02F3/34; C02F9/00

JP5119440A
JP2265696A
JP6335384A
JP8289778A
JP52139264A
JP810797A
JP852490A

Akira Asamura (3 outside)

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