Secondary clarifiers form a crucial component in gravity separation processes mainly in solid-liquid separation. They perform the crucial process of separating the activated sludge from the clarified effluent and also to concentrate the settled sludge. As treatment plants receive increasingly high wastewater flow, conventional sedimentation tanks suffer from overloading problems which result in poor performance. Inlet baffle modification by using an energy dissipating inlet (EDI) was proposed to enhance the performance in the circular clarifiers in Al-Dewanyia wastewater treatment plant. A 3-Dimensional fully mass conservative clarifier model was applied to evaluate proposed tank modification and to estimate the maximum capacity of the existing and modified clarifiers. A Computational Fluid Dynamics (CFD) model was formulated to describe tank performance and design parameters were obtained based on the experimental results. The study revealed that velocity and SS are better parameters than TS, BOD5, and COD to evaluate the performance of sedimentation tanks. Removal efficiencies of suspended solids, biochemical oxygen demand, and chemical oxygen demand were higher in the EDI (Baffle).
The effect of change of channel width on bed load and transport load of sedimentation for given discharge are studied. The transport load is a mathematical function of change in channel width . The phenomena of transport load of sedimentation in a meandering alluvial channels are significant problems in river engineering and important factor that effects on the works of river control . The finite element model is developed to determine the effect of change of channel width on bed load capacity to ( 2.5 km ) length of the Euphrates river within hit city used value of manning roughness is ( 0.028 ). Calculated the optimum width actualized maximum transport capacity .
In the circumstances interface Iraq wars and a lack of public services to citizens, water remains the most important requirements of daily life and must be accorded primary importance by ensuring that the processing of citizens with drinking water quality and conformity with the standard specifications, and that can be done not through the presence of plants To treat drinking water with high efficiency. In this research study of the Show a water Fallujah, which consists of the traditional liquidation of most water stations in Iraq , sedimentation and filtration and sterilization, has been studying each stage of the three phases through the collection of information and testing of each phase, has found that the plant Efficient (57%) of a deposition, and the efficiency (50%) of the nomination phase and the efficiency (40-90%) in the sterilization stage, within the World Health Standards for water quality characteristics , PH was equal to( 6.7), and equal to (3 turbidity unit international) turbidity, and electrical Alaissali (1100 μs/cm ), and the total salt concentration of TDS equal to (530mg/L) for drinking water out of the station, The concentration of suspended solids (40 mg / L) are not in conformity with the specifications