الفهرس | Only 14 pages are availabe for public view |
Abstract Over recent years, new synthetic filter media have been developed with a density less than that of water. Floating media are now available for the filtration of water and wastewater. Expanded polystyrene (EPS) is one of these floating media, that have been favorable because it is commercially widespread, lightweight, and available in many geometric forms. This research was conducted to study the ability of expanded polystyrene to improve the performance of the upflow filters. Groundwater has been used alongside to surface water in Egypt. In the case of using groundwater as a drinking water, the total iron concentration should be PJO DQG turbidity should be 1.0 NTU, as allowed by the domestic regulations. The aim of this thesis was to investigate the main properties of expanded polystyrene and to evaluate its performance in iron removal through the upflow filter. Toward these goals, series of batch experiments were performed to estimate the adsorption capacity of the EPS using different concentrations of methylene blue dye. Also, a pilot plant was designed and constructed; one meter of the filter column was filled with EPS. Effective size, uniformity coefficient, and density of EPS were 0.63mm, 1.43, and 30 kg/m3, respectively. Synthetic feed water was prepared by adding synthetic iron to free chlorine tap water to get pre-determined different iron concentrations from 1 to 5 mg/l. These resulted in turbidities from 3.5 to 12.5 NTU, respectively. The filter was tested at filtration rates of 80 ,100 and 120 m3/m2/day. Bed washing was performed in the downflow direction. Results showed that EPS beads had an adsorption capacity of 0.036 mg/g (Batch experiments). Initial dye concentration, adsorbent dose, PH and contact time affected the adsorption capacity. The filtration tests showed that the system was successful in removing iron and turbidity with percentage of 97% and 95%, respectively. The influent iron concentrations and filtration rate had remarkable effects on the effluent turbidity, iron concentration, filterability index, and headloss. Backwash achieved an expansion of 18% with water consumption 16.7% , 20% and 25% of the total water production of the filter for filtration rates 80 ,100 and 120 m3/m2/day. ABSTRAC |