2013 Cilt 7 Sayı 19

Permanent URI for this collectionhttps://hdl.handle.net/11452/16995

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Browsing by Department "Çevre Mühendisliği Bölümü"

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    Bioremediation of petroleum-contaminated soil
    (Uludağ Üniversitesi, 2013-03-20) Dindar, Efsun; Olcay, Fatma; Şağban, Topaç; Başkaya, Hüseyin Savaş; Mühendislik ve Mimarlık Fakültesi; Çevre Mühendisliği Bölümü
    Environmental pollution with petroleum and petrochemical products has attracted much attention in recent decades. Contamination of the natural environment with oil derivatives causes soil, including arable land, to degrade, while the occurrence of many spots and areas of contamination may result in underground environments. This has been shown to have harmful effects on the environment and human beings at large. Improving our knowledge of the effects and remediation of oil-related pollution therefore is important for the future of developing countries with respect to the sustainable use of the environment. Bioremediation is one of the most popular remediation technologies in use due to the relatively low cost. It is a rapidly developing field of environmental restoration, utilizing natural microbial activity to reduce the concentration and/or toxicity of various chemical substances such as petroleum products and aliphatic and aromatic hydrocarbons. Biodegradation is a natural process carried out by soil and aquatic microorganisms, mostly bacteria and fungi. Certain bacterial strains have a demonstrated ability to break down or transform the chemical substances present in petroleum products. The goal of oil-spill bioremediation methods is to provide favorable conditions of oxygen, temperature and nutrients to maximize biological hydrocarbon breakdown. This paper is a short overview of petroleum hydrocarbon biodegradation and bioremediation.
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    Removal of acute toxicity with ozonation in textile plant waste water
    (Uludağ Üniversitesi, 2013-01-29) İleri, Saadet; Karaer, Feza; Mimarlık ve Mühendislik Fakültesi; Çevre Mühendisliği Bölümü
    Textile industry is one of the most common and essential sector in the world. The textile industry consumes large quantities of water at its different steps of dyeing and finishing, among other processes. The non-biodegradable nature of dyes and their stability toward light and oxidizing agents complicate the selection of a suitable method for their removal. Moreover, toxicity bioassays have demonstrated that most of them are toxic. The acute toxicity of waste water of textile plant was investigated using Daphnia magna (water fleas) and ozonation. In this study, samples were taken from a cotton textile plant in Bursa at the first stage, the treatment was made by ozonation and then the toxicity tests were performed. In ozonation, the appropriate pH, dosage of ozone (O3) and ozonation time were determined. In toxicity tests, monitoring of toxicity were made at different dilution rates using Daphnia magna both in treated water with ozonation and in wastewater. The acute toxicity scale LD50 (Lethal Dose) values were determined as 50 % in waste water and 90 % in water treated with ozonation. As a result, it can be concluded that ozonation demonstrated a positive contribution to the removal of acute toxicity in textile wastewaters