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Abstract
One of the processes for pulping the coffee cherries can be obtained by using water. This process uses a great amount of water and its waste contains high concentration of organic matter and other compounds such as pesticides, which makes this wastewater potentially harmful to any receiving water system. The present work investigated the treatment of the pulping wastewater using two advanced oxidation processes (AOPs). The optimum molar concentration for the treatment was 6.3 × 10−2 mol L−1 for iron (II) and 2.5 × 10−1 mol L−1 of H2O2. The solar photo-Fenton system showed better results compared to the conventional Fenton, with a reduction of biological oxygen demand (BOD) up to 60%. The combination of chemical and biological treatment showed that the sequence of UASB followed by solar photo-Fenton treatment showed better BOD removal efficiency of 95%.
ACKNOWLEDGEMENTS
The authors would like to thank FAPEMIG and CAPES/CNPq/MEC for financial support, and Dr. Nogueira, R.F.P (Univ. Estadual Paulista – UNESP) for TOC analysis.