EFFECT OF TEMPERATURE AS A SHOCK LOAD ON AEROBIC BIOMASS ACTIVITY FOR COMPLEX WASTEWATER

This research focuses on the effect of temperature changes on the activity of aerobic biomass in the mixture of industrial& domestic wastewater. The study depends on the present returned activated sludge (RAS) in Zenien Wastewater Treatment Plant as the inoculated sludge for treatment of mixtures of 70%domestic sewage and 30% raw industrial wastewater in batch identical reactors provided with the DO level (2-2.5 mgO2/l), MLVSS (1.5gVSS/l), and wastewater volume (60 L) at the different temperature ranges from (20 0 C- 55 0 C ) . The experiments were determined by measuring the concentrations of Chemical Oxygen Demand (COD), Biological Oxygen Demand (BOD5), and total suspended solids (TSS) . The research aimed also to investigate the optimum range of temperature that can be sustained by the aerobic bacteria in biological method to improve the removal biological activity. The research ensures that the mixture of domestic and industrial wastewater enable the bacterial microbial group to resist shock loads and this was represented in the sustainability of high temperature which reached to 45 0 C and in addition at this temperature range the sludge achieved maximum retention time in the reactor with good activity and maximum yielding coefficient.