Master Degree / Yüksek Lisans Tezleri
Permanent URI for this collectionhttps://hdl.handle.net/11147/3008
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Master Thesis Preparation and Characterzation of Ceramic Micro/Ultra Membranes for Separation Processes and Wastewater Treatment(Izmir Institute of Technology, 2016) Kırkbaş, Öncel; Çiftçioğlu, MuhsinThe availability of fresh water is vital for life, sustainable growth and healthy ecosystems on earth. Increasing world population, a changing climate, intensive agricultural practices, economic growth and urbanization will undoubtedly continue to make the issue of water scarcity a global priority for years to come. The gap between the need and the supply of water globally is increasing steadily which necessitates significant measures to be taken towards conservation, and reuse of industrially, domestically and agriculturally used water. Textile industry is one of the leading industries in the use of fresh water and the generation of wastewaters. Technologies currently in use towards industrial and domestic water treatment like sedimentation, chemical coagulation, biological treatment etc. cannot produce reusable water but also generate significant amounts of solid waste. Membranes are now widely accepted to have the potential of supplying cost-effective solutions for water treatment and a growing range of purification and separation problems. The number and the pore structure design of the multiple selective layers on the inner surfaces of tubular α-alumina supports vary with the nature of the intended separation application. Although the nature of MF membranes is relatively well developed, current research is concentrated on the design of nanoporous phase structure in NF and UF selective layers. Selective micro/ultra/nanofiltration layers were formed on extruded tubular alumina supports by colloidal/sol-gel techniques. The performance of these selective layers were investigated by the experiments performed with textile wastewater. Permeates from ceramic tubular membranes were characterized by spectrophotometer. The suspended solids and color (Pt-Co) were reduced by 90% and 80%. respectively.Master Thesis Preparation of Ultrafiltration/ Microfiltration Ceramic Composite Membranes for Biotechnology Applications(Izmir Institute of Technology, 2002) Erdem, İlker; Çiftçioğlu, MuhsinCeramic membranes possess desirable properties for industrial separation and concentration processes where extreme conditions of heat, pH, ionic strength are present. Ceramic composite membranes consisting of a support and a thin membrane layer with finer pores were prepared in this work. Ceramic supports were prepared from fine alumina and zirconia powders by dry-pressing and slipcasting.These supports were sintered in the 1100-1200°C temperature range.These supports were dip-coated with ceramic sols prepared from zirconium propoxide and aluminium isopropoxide for the preparation of thin layers with finer pores. Average particle sizes of these sols were measured as 3-7 nm for zirconia sol and 30-40 nm for alumina sol by laser scattering technique. The dipcoated membranes were calcined in the 500-600°C temperature range. The thermal characterization of membrane layers was determined with DTA/TGA. The microstructure of the ceramic composite membranes was investigated with SEM. The clean water permeability (CWP) of membranes was tested by using deionised water in a filtration set-up. Separation experiments were performed with bovine serum albumin (BSA, Stokes diameter: 7 nm) solution and whey to determine protein separation capacity of the composite membranes. The CWP of the dry pressed alumina supports heat treated at 1100°C was found to be higher than the permeability of the slip-cast zirconia supports heat treated at 1200°C. The protein retention of the slip-cast zirconia support was detected as 60% with UVVIS spectrophotmeter analysis (Abs. at 280nm). After the modification of the support with dip-coating protein retention of 96% was achieved. Then the composite membranes were used in whey protein concentration experiments. Whey, which is a complex biological liquid, containing proteins, carbohydrate, minerals, was fed to the membrane without any clarification process. The retention of whey proteins with dry-pressed alumina support modified with 1/4 diluted zirconia sol (calcination temperature: 500°C) was found to be 96% with a permeate flux of 40 Lm-2hour-1.