Key Engineering Materials Vol. 870

Abstract: Electrocoagulation process was employed for the treatment of river water flows in Iraq. In this study, a batch Electrocoagulation process was used to treat river water taken from Al - Qadisiyah water treatment plant. electrolysis time, voltage and inter-electrode spacing were the most important parameters to study . A statistical model was developed using the RSM model. The optimum condition after studying the parameter effect the process was 1 cm separating, 30 volts . The RSM model shows the ideal condition of removal for both the TSS and turbidity at 1 cm, 20 volts and 55 min.

Abstract: As a regulated contaminants, fluorine compounds impact the health of millions of persons around the world. Adsorption method is employed to remove fluoride ions from a synthetic water using concrete waste materials as a low cost adsorbent and to evaluate its feasibility as an alternative agent to eliminate fluoride ions in aqueous solution. Influence of pH, concrete particles dosage, agitation speed, fluoride initial concentration and contact time on F⁻ removal were investigated by using batch mode. Fluoride removal has been obtained over a wide range (3-11). The rate of adsorption was rapid at the first 4 hours, while the equilibrium has been reached within 9 hrs. The desorption study revealed that fluoride adsorption onto concrete particles was chemical in nature. The kinetic of adsorption was fitted well with second-order rate model, while the adsorption behavior obeyed Freundlich model. This study obviously presents the applicability of concrete particles as low cost adsorbent to eliminate fluoride from water.

Abstract: The objective of this research is to make settling column for measuring the suspended solids (SS) and dissolved solid (DS) in water by doing discrete and flocculate on it. This device is manufactured in the laboratories at University of Wasit, college of engineering. This device consists of plastic pipe with a diameter and height of 20 cm and 2 m respectively and it has four ports which are located at different depths. Also, it contains moto-diver to rotate the water inside the plastic tube (simulated reality from the river, mix water to prevent sedimentation). This design also involves water tank for storing the sample and moto to transfer water from the tank to the plastic tube. Samples are taken from the Tigris River in the governorate of Waist, Kut City. Samples are taken at depth of 5 meters and the results are accurate with several analyses have been done on it. This project is done by Stokes law in which particles have settled with detention time as a requirement and the depth of the settling tank. The optimum alum ratio is also obtained by jar test which is equal to 450mg/l. The results showed that the best ratio of removing (X˚ /˳) which is equal to 48% and thus finding the detention time in the tank and depth of tank as a purpose of design sedimentation tank with these requirements.