Tez özetleri Astronomi ve Uzay Bilimleri Anabilim Dalı

The Effects of So4=, No3ֿ and Humıc Substances on the Oxidation of Fe(Iı) With Atmospheric Oxygen

Iron is relatively abundant in the earth’s crust. Iron exists insoluble form as FeO3 and FeS2 in soil and rocks. It can be reduced +2 in an anaerobic conditions. It happens because of while rainwater run to underground, dissolved oxygen in the rainwater is expended by organic materials. It is not wanted to be iron dissolving in water. Because if iron dissolves in water, water seems turbid and coloured. Oxidizing iron composes brown colour in water. Iron concentration of surface waters don’t exceed of 1 mg/l. because surface waters are in touch with air. But ground waters involves much iron. Because these waters are lacking of oxygen. Also these waters has largely carbon dioxide.

Removal of iron is important both drinking and industrial usage. For this reason iron removal processes must be more efficient.

As is known, oxidation with atmospheric oxygen process is the most widely-used method in iron removal. This project will be helpful to

Use the air oxidation for achieving desired limits of Fe(II), which are increase in summer months.

Investigate the effects of organic and inorganic matter concentrations and to find the control strategies about this subject.

In the first chapter, the importance and the general objectives of the study are defined in detail. In the second chapter, general informations are given about the study. In the third chapter, material and method of the experimental study are defined. In the experimental studies, firstly calibration curve was plotted for analysing Fe(II) concentration in spectrofotometer. Samples were taken from Fe(II) solution and their absorbans were read in spectrofotometer. Afterwards effects of SO4=, NO3ֿ and humic acid on the oxidation of Fe(II) with atmospheric oxidation were examined in the conditions of Fe(II)= 1mg/l, pH=6.7, temperature: 250C and alkalinity: 2x10-2 eq/l. In the forth chapter experimantal results are specified.

According to the results, it was seen that Fe(II) oxidation decreases at the presence of SO4=, NO3ֿ and humic substances accelarates the Fe(II) oxidation at the beginning of the experiment, then the oxidation decreased with the time rate. In the fifth chapter some explanation was made according to the findings. Finally in the sixth chapter some suggestion was made to guide the other works about this subject.

Key Words: Fe(II), oxidation, sulph ate (SO4=), nitrate (NO3-), humic substances.

GÜNEŞ Sevgi
Danışman : Yrd. Doç. Dr. Nüket SİVRİ

Anabilim Dalı : Çevre Mühendisliği

Mezuniyet Yılı : 2009

Tez Savunma Jürisi : Yrd. Doç. Dr. Nüket SİVRİ

: Prof. Dr. Semiha ARAYICI

: Prof. Dr. Dursun ZAFER ŞEKER

: Prof. Dr. Nilgün BALKAYA

: Doç. Dr. A. Funda BAĞCIGİL