Optimization of Wastewater Treatment Plant, SAR Treatment Tananger

Abstract

The focus of this thesis is optimization of the wastewater treatment plant, SART owned by SAR AS. Based on an evaluation of the present treatment condition, capacity and limitations, performance of the plant has been evaluated, with the objective of proposing optimizations in terms of increasing capacity of the plant. The wastewater treatment plant is designed as a conventional activated sludge plant, but is currently operated as a CFSTR process. Mass balance analysis of the plant has been done accordingly. Experimental analysis of the wastewater has shown that the received wastewater is primarily composed of readily biodegradable COD. Effluent wastewater analysis has shown that the water still contain s biodegradable COD, indicating that the treatment process can be optimized further. The performance of the plant has been determined in terms of COD removal and showed an average COD removal of 53% and an average dissolved COD removal of 83%. The low perc entage of total COD removal has been found to be a result of high biomass content in the effluent. Increasing the plant capacity in terms of flow, has been shown not to be feasible when operating the plant as a CFSTR process. Operating the plant as an activated sludge plant by recirculating and wasting sludge has been proposed as an option to increase COD removal efficiency and to increase the plant capacity.