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    Acute Toxicity Assessment of Antibiotics in Water by Luminiscence Bacteria and Lepidium Sativum
    (ELSEVIER SCIENCE BV, 2015) Tongur, Suheyla; Yildirim, Rifat
    Antibiotics are drugs, which are used extensively by people and animals. The large part of antibiotics, which are consumed by people and animals, is sent to domestic waste sewage. It is stated through researches that these are antibiotics in aquatic habitats around the world. Vibrio fischeri toxicity tests will be used in this study as a method for evaluating the toxicity of synthetic antibiotic wastewater, which is used to determine possible harms of antibiotics for microbial ecology of the receiver environment. Toxicity for plants and aquatic life of wastewater containing antibiotics will be determined and different types of tests will be compared in terms of sensitivity. This research is important in terms of evolution of applicability of toxicity test methods used in this paper and shedding of light on researches that are yet to be carried out in the future. (C) 2015 Published by Elsevier B.V.
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    Adsorption Kinetics of Chloroform from Aqueous Solutions onto Activated Lignite
    (WILEY, 2013) Tongur, Suheyla; Aydin, Mehmet Emin
    The lignite coal researched by this study was subjected to a two-stage activation process performed in the scope of obtaining active carbon from domestic resources. Activation and carbonization stages were used in the experiments. The modified lignite was produced by impregnating lignite with KOH and washing the activation product with 15% HCl solution after thermal treatment. Increasing KOH dosage also increased the removal efficiency. The variables investigated in adsorption experiments were contact time, initial concentration, pH, and sorbent dosage. Adsorption kinetics was fitted by using the pseudo-first-order equation, pseudo-second-order equation, and intra-particle diffusion. Isotherm modeling was carried out using Langmuir, Freundlich, and DubininRadushkevich equations. Selected target compound in this work is common environmental pollutant in waters. A commonly known effect of chloroform is its carcinogenic effect. Therefore, removal of these compounds from water is considerably important. Chloroform removal of 97% for was achieved by the use of Konya region activated lignite.
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    FACTORS INFLUENCING FORMATION OF DISINFECTION BY-PRODUCTS IN SIX DRINKING WATER RESERVOIRS (KONYA, TURKEY)
    (PARLAR SCIENTIFIC PUBLICATIONS (P S P), 2011) Kara, Gulnihal; Tongur, Suheyla; Aydin, Mehmet Emin
    This study examined spatial and seasonal variation of total organic carbon (TOC), pH, free residual chlorine, temperature and bromide which possibly affect the formation of of disinfection by-products (DBPs) in six drinking water reservoirs of Konya, Turkey, during the period 2004-2007. This study also examined DBP formation via chlorination of the water samples from these reservoirs. The average TOC in the reservoirs was 9.22 mg/L, pH was 8.3, temperature was 15.25 degrees C, bromide was 0.13 mg/L, and free residual chlorine was 0.16 ppm. In drinking water reservoirs, the total DBP concentration increased slightly with increasing pH. A low but significant relationship (r = 0.2, p <0.01) occurred between total DBPs and free residual chlorine. A high and significant relationship (r= 0.63, p < 0.01) occurred between total DBP concentration and total organic carbon. The extent of bromide incorporation into DBPs increased with increasing bromide ion level.
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    TOXICITY ASSESSMENT OF LANDFILL LEACHATES WITH A BATTERY OF BIOASSAYS
    (PARLAR SCIENTIFIC PUBLICATIONS (P S P), 2015) Aydin, Mehmet Emin; Aydin, Senar; Bahadir, Muefit; Kolb, Marit; Tongur, Suheyla; Kara, Gulnihal
    In this study, the toxicity of the leachate from the municipal landfill was evaluated and assigned to its chemical composition. Leachate samples were collected considering different seasons and assessed for their toxicity by using Thamnotox with Thamnocephalus platyurus, Daphtox with Daphnia magna, Vibrio fischeri, Lemna minor, and Lepidium sativum. Leachate samples were also characterized measuring their physical and chemical parameters. Relationships between the chemical composition and the toxicity of leachate samples were established. EC50, values for Thamnotox, Lemna minor, and Lepidium sativum were negatively correlated with the COD content. There were significant correlations between the TOC with EC50 values of Vibrio fischeri and Lemna minor tests. Vibrio fischeri wasthe most sensitive test organism investigated for the landfill leachate. Considering toxic unit values, leachate samples were highly to very highly acute toxic, according to all the tests carried out.