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Treatment of dairy wastewater using anaerobic and solar photocatalytic methods
Authors:J Rajesh Banu  S Anandan  S Kaliappan  Ick-Tae Yeom
Affiliation:1. Department of Civil and Environmental Engineering, Sungkyunkwan University, 300, Chunchun-dong, Jangan-gu, Suwon-Si 440-746J, Republic of Korea;2. Department of Applied Chemistry, Kanagawa Institute of Technology, 1030 Shimoogino, Atsugi, Kanagawa 243-0292, Japan;3. Centre for Environmental Studies, Anna University, Chennai, Tamil Nadu, India;1. Division of Salt & Marine Chemicals, CSIR – Central Salt and Marine Chemicals Research Institute, Bhavnagar 364002, Gujarat, India;2. Academy of Scientific & Innovative Research (AcSIR), CSIR – Central Salt and Marine Chemicals Research Institute, Bhavnagar 364002, Gujarat, India;3. Division of Plant Omics, CSIR – Central Salt and Marine Chemicals Research Institute, Bhavnagar 364002, Gujarat, India;1. Department of Civil Engineering, Regional Centre of Anna University, Tirunelveli, India;2. Department of Civil and Materials Engineering, University of Illinois at Chicago, United States;3. Department of Civil and Environmental Engineering, Sungkyunkwan University, Seoul, South Korea;1. Physical Chemistry Department, National Research Centre (NRC), 33 Elbohouth Street, P.O. Box 12622, Dokki, Giza, Egypt;2. Polymers and Pigments Department, National Research Centre (NRC), 33 Elbohouth Street, P.O. Box 12622, Dokki, Giza, Egypt;3. Inorganic Chemistry Department, National Research Centre (NRC), 33 Elbohouth Street, P.O. Box 12622, Dokki, Giza, Egypt;4. Fabrication Technology Department, City for Scientific Research and Technological Applications (SRTA-City), New Borg El-Arab City, Alexandria, 21934, Egypt;5. Nano-Photochemistry, Solar Chemistry and Computational Chemistry Labs, Department of Chemistry, Faculty of Science, Ain Shams University, Abbassia, 11566, Cairo, Egypt
Abstract:The present study was aimed to treat the dairy wastewater by using anaerobic and solar photocatalytic oxidation methods. The anaerobic treatment was carried out in a laboratory scale hybrid upflow anaerobic sludge blanket reactor (HUASB) with a working volume of 5.9 L. It was operated at organic loading rate (OLR) varying from 8 to 20 kg COD/m3 day for a period of 110 days. The maximum loading rate of the anaerobic reactor was found to be 19.2 kg COD/m3 day and the corresponding chemical oxygen demand (COD) removal at this OLR was 84%. The anaerobically treated wastewater at an OLR of 19.2 kg COD/m3 day was subjected to secondary solar photocatalytic oxidation treatment. The optimum pH and catalyst loading for the solar photochemical oxidation was found to be 5 and 300 mg/L, respectively. The secondary solar photocatalytic oxidation using TiO2 removed 62% of the COD from primary anaerobic treatment. Integration of anaerobic and solar photocatalytic treatment resulted in 95% removal of COD from the dairy wastewater. The findings suggest that anaerobic treatment followed by solar photo catalytic oxidation would be a promising alternative for the treatment of dairy wastewater.
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