Wastewaters quality in the anaerobic stage of a treatment plant from a baker's yeast factory

The efficiency of a wastewater treatment plant located into a food industrial platform was assessed. Main wastewaters are collected from the baker’s yeast factory. The wastewaters are purified through a process, which is running in two steps, namely anaerobic treatment and the aerobic biological stage. The purpose of this work is to evaluate the wastewaters quality of the anaerobic stage from above" mentioned treatment plant. The assessment was performed based on standard parameters, such as materials in suspension, chemical oxygen demand, biological oxygen demand, temperature, pH, nitrogen content, phosphor compounds and sulphur ones. Meantime, the analysis results were compared with the initial data design of anaerobic treatment phase. Overall, the results showed that anaerobic wastewater phase, as part of treatment plant from considered baker’s yeast factory ensured partially the purge process in aim to frame within load limits of pollutants from industrial wastewater discharge into the local sewerage network. Determined values of the effluent parameters varied by a polynomial equation, being influenced by many factors. There are differences between operation modes of the anaerobic digestion in comparison with design data of the treatment equipment, reason for which effectiveness of the treatment ranges towards 70% instead of 100%.