5856

5471

كارشناسي ارشد

محيط زيست

اصفهان: دانشگاه صنعتي اصفهان، دانشكده عمران

1389

چهارده،114ص.: مصور،جدول،نمودار

ص.ع.به فارسي و انگليسي

مجيد سرتاج

عبدالله رشيدي مهرآبادي

11/2/90

نوراله مير غفاري، هستي هاشمي نژاد

مهندسي عمران

ID5471

به فارسي و انگليسي: قابل رويت در نسخه ديجيتالي

Evaluation of Removal Efficiency of Organic Matter Using TiO2 in Transparent Pipes Sepideh taheri Sepidehtaheri 1984@yahoo com Date of Submission 2011 04 6 Department of Civil Engineering Isfahan University of Technology Isfahan 84156 83111 Iran Degree M Sc Language Farsi Supervisor Dr Majid sartaj msartaj@cc iut ac ir Abstract Presence of organic compounds in drinking water is an important factor in its quality One of the most important reasons cited for removing organic compounds from drinking water is their role as precursor in the formation of dangerous side products after disinfection In this study removal efficiency of solar photocatalistic degradation of organic matter using immobilized TiO2 layer coated on the inside surface of transparent polyethylene pipes which let around 50 of the sun s UV rays pass through and also in glass quartz pipes packed with glass balls coated with TiO2 have been investigated The aim of this study was to evaluate the efficiency of these systems in removing organic matter from water under different intensity of solar radiation and contact time When exposed to visible or ultraviolet light TiO2 can act as a photocatalist and by releasing hydroxyl free radical and superoxide ion can degrade organic matter Total organic carbon measurement was chosen as an indicator of contamination The research was conducted using two different and distinct pilots systems The first pilot system included three reactors The first reactor was a transparent polyethylene pipe with immobilized TiO2 layer coated inside the second reactor was the same as the first pipe but without the TiO2 layer which is used to evaluate the efficiency of solar ultraviolet radiation alone in removing organic matter The third reactor was a normal opaque polyethylene pipe with TiO2 coated inside which was used to assess the ability of organic matter removal in absence of sun light The second tested pilot included 5 columns The first three columns were transparent pipes made of quartz filled with glass balls coated with titanium dioxide The fourth column was an opaque quartz pipe which was also filled with glass balls coated with titanium dioxide The fifth column was a pipe made of quartz which contrary to the previous pipes was filled with balls without the titanium dioxide coating The last two pipes have been investigated as control pipes In the first stage the performance of these columns have been investigated using methyl Orange color index In the next steps the organic material removals in these tubes have been studied The concentrations of organic matter were measured by TOC Analyzer Shimadzu device using combustion infrared method In the experiment with Methyl Orange Color Index in pilot with polyethylene pipes transparent pipe with TiO2 coating decreased the concentration of Methyl Orange from 1 ppm to 0 2 ppm within 8 days In pilot with quartz pipes the transparent pipe with balls coated with TiO2 due to large contact surface decreased the concentration of Methyl Orange from 1 ppm to 0 6 ppm within 4 hours The effect of sunlight exposure time and contact time of water in the columns on system efficiency have been investigated Contact times in columns were either 120 or 240

مجيد سرتاج

عبدالله رشيدي مهرآبادي

نوراله مير غفاري، هستي هاشمي نژاد