Application of Photo-Fenton Process for the Treatment of Kraft Pulp Mill Effluent
- 1 Department of Chemistry, Federal University of Vicosa, Vicosa, Brazil
- 2 Department of Chemistry, Federal University of Vicosa, Vicosa, Brazil
- 3 Department of Forest Engineering, Federal University of Vicosa, Vicosa, Brazil
- 4 Department of Chemistry, Federal University of Vicosa, Vicosa, Brazil
- 5 Department of Chemistry, Federal University of Vicosa, Vicosa, Brazil
- 6 Department of Forest Engineering, Federal University of Vicosa, Vicosa, Brazil
Abstract
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 H 2 O 2 : Fe 2 + 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 H 2 O 2 application resulted in an efficiency increase of the photo-Fenton process, although this was not a directly proportional relation. For most cases, the H 2 O 2 : Fe 2+ 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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