Coupling of photocatalytic and biological reactors to remove EDTA-Fe from aqueous solution.
Degradation of 2.5 mM EDTA-Fe solution was performed in a coupled photocatalytic-biological reactor. The system consists of a photochemical annular reactor filled with TiO2 immobilized on glass Raschig rings coupled with an activated sludge continuous reactor. Around 50% of EDTA degradation was reached after 150 min irradiation. Simultaneously a four-fold increase in biodegradability, measured as BOD5/COD ratio, was observed. The activated sludge is not capable to degrade the complex EDTA-Fe but it removed partially the COD and efficiently the BOD5 of the photochemically treated solution.
Gómez
C
C
Facultad de Ciencias Químicas, Centro de Biotecnología, Universidad de Concepción, Casilla 160-C, Concepción, Chile.
Rodriguez
J
J
Freer
J
J
Lizama
C
C
Zaror
C
C
Mansilla
H D
HD
D001673:Biodegradation, Environmental; D019149:Bioreactors; D002384:Catalysis; D004492:Edetic Acid / Q000737:chemistry / Q000302:isolation & purification / Q000378:metabolism / Q000528:radiation effects; D005290:Ferric Compounds / Q000737:chemistry / Q000302:isolation & purification* / Q000378:metabolism / Q000528:radiation effects; D007502:Iron Chelating Agents / Q000737:chemistry / Q000302:isolation & purification* / Q000378:metabolism / Q000528:radiation effects; D010084:Oxidation-Reduction; D012722:Sewage; D014025:Titanium / Q000737:chemistry; D014466:Ultraviolet Rays; D014874:Water Pollutants, Chemical / Q000737:chemistry / Q000302:isolation & purification* / Q000378:metabolism / Q000528:radiation effects; D018508:Water Purification / Q000379:methods*
D005290:Ferric Compounds; D007502:Iron Chelating Agents; D012722:Sewage; D014874:Water Pollutants, Chemical; C009495:titanium dioxide; D004492:Edetic Acid; D014025:Titanium; C019179:Fe(III)-EDTA