An Advanced Oxidation Process (AOPs) was carried out in this study with the use of immobilized ZnO and solar/UV as an energy\r\nsource to degrade dairy wastewater. The semibatch reactor system consisted of metal plate of 800 Ã?â?? 250mm and a glass tank.The\r\nreaction time was of 3 h for 3 L of dairy wastewater. Experiments were performed based on a surface response methodology in order\r\nto optimize the photocatalytic process. Degradation was measured in percentage terms by total organic carbon (TOC). The entry\r\nvariables were ZnO coating thickness and pH, using three levels of each variable.The optimized results showed a TOC degradation\r\nof 31.7%. Optimal parameters were metal-plate coating of 100 ??m of ZnO and pH of 8.0. Since solar/UV is a constant and free\r\nenergy source in most tropical countries, this process tends to suggest an interesting contribution in dairy wastewater treatment,\r\nespecially as a pretreatment and the optimal conditions to guarantee a better efficiency of the process.
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