The present work evaluated
the use of photo-Fenton process for the treatment of kraft pulp mill effluent. The
photo-Fenton best operating conditions, such as pH, concentration, and H2O2:Fe2+ ratio were evaluated. The efficiency of the treatment was measured
by COD (chemical oxygen demand) removal.
The results showed that the optimum pH for the photo-Fenton process was equal to
3. The increase in H2O2 application resulted in an efficiency
increase of the photo-Fenton process, although this was not a directly proportional
relation. For most cases, the H2O2: Fe2+ proportion
of 100:1 yielded the best results for COD removal. Solar radiation was more efficient than artificial UV to the COD removal. During the treatment the organic
matter of the effluent was more oxidized than mineralized, showing a higher removal
of COD than BOD (biochemical oxygen demand) and TOC (total organic carbon), respectively. So, photo-Fenton process increased
the BOD/ COD ration but decreased the BOD/TOC ratio.
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Pérez, M., Torrades, F., Hortal, J.A.G., Domenech, X. and Peral, J. (2002) Removal of Organic Contaminants in Paper Pulp Treatment Effluents under Fenton and Photo-Fenton Conditions. Applied Catalysis B: Environmental, 36, 63-74.
http://dx.doi.org/10.1016/S0926-3373(01)00281-8
Moraes, J.E.F., Silva, D.N., Quina, F.H., Filho, O.C. and Nascimento, C.A.O. (2004) Utilization of Solar Energy in the Photodegradation of Gasoline in Water and of Oil-Field-Produced Water. Environmental Science Technology, 38, 3746-3751. http://dx.doi.org/10.1021/es034701i
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http://dx.doi.org/10.1016/S1010-6030(02)00148-X
Torrades, F., Pérez, M., Mansilla, H.D. and Peral, J. (2003) Experimental Design of Fenton and Photo-Fenton Reactions for the Treatment of Cellulose Bleaching Effluents. Chemosphere, 53, 1211-1220.
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