الفهرس 
INTRODUCTION AND AIM OF WORKOnly 14 pages are availabe for public view
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Abstract
This thesis reports fabrication of low cost macro porous ceramic water filters (to be used in microfiltration applications) using Egyptian clays (Aswan ball clay and Aswan kaolin) in addition to other raw materials such as potash feldspar and quartz which are locally found in Egypt. Three tubular ceramic filters, F1, F2, and F3, were fabricated by slip-casting method. The raw materials were characterized using chemical analysis (XRF), mineralogical analysis (XRD), thermal analysis (DTA and TGA), particle size distribution and determination of powder density. Sintering temperature in this work is 900 °C instead of 1000–1100 °C which are the usual sintering temperatures for inorganic membranes fabrication. The filters casted as tubular filters (” ” " ~ " ” ”5.5 cm outer diameter, 0.5 cm thickness and 23 cm length) and were subjected for characterization studies by determination of five important physical properties (water absorption, apparent porosity, bulk density, apparent specific gravity and porosity and pore size distribution), compressive strength, microstructure (SEM) and antibacterial activity on their surfaces. The performance of the filters in turbidity removal from tap water, turbidity, total coliform, COD and BOD removal from El-Salam sluiceway water and separation of Humic acid and oil particles from solutions was evaluated. F3 (mixture of clay, potash feldspar, and quartz) showed the best performance. It reduced the total coliform in the feed from 70 to 14 cfu/100 ml with a separation percentage of 80% and COD and BOD with separation percentages of 46.7% and 62.5% respectively. Its removal of Humic acid particles was with 60% as a separation percentage and a flux of 88.5 L/m2 . hr. and with 70% as a separation percentage of oil particles and 98.33 L /m2 .hr as a permeate flux. Enhancing its performance by coating with PVC polymeric membrane was effective and raised its separation percentages from 60 to 75 % in separation of Humic acid and from 70 to 96.3 % in oily water filtration. It also showed a good antimicrobial effect on bacteria but not on Aspergillus niger, as a fungus. Thus, F3 is the most suitable tubular ceramic water filter for antibacterial microfiltration applications and separation of Humic acid and oil particles from waste water.