Abstract:
This study demonstrates a feasible and novel design of up-concentration of domestic sewage through Biosorption-Sedimentation process (BSP) for maximum energy production via anaerobic digestion in later stage. System was operated at various anoxic to anaerobic HRTs (Tano/Tan) with an infinite SRT to obtain up-concentrated stream (in terms of COD and Total Phosphorous) and minimum ammonium-nitrogen concentrations in effluent. Results indicate that the potential of net energy yield up to 15.5 kWh/m3 at could be achieved an OLR of 12 kg of COD/m3/d. Tano/Tan of 60 minutes/60 minutes was selected as optimum ratio, keeping in view the maximum potential energy in terms of COD, Carbon: Nitrogen: Phosphorous (C:N:P) ratio and ammonium-nitrogen concentration of effluent. This study concludes that BSP may efficiently overcome the issue pertaining to sludge treatment and disposal associated with functional aerobic wastewater treatment plants. Also maximum energy can be extracted via anaerobic digestion of concentrated stream due to an addition of up concentration step in future treatment plants in order to make net energy positive wastewater treatment plants.
