Yazar "Eyidogan, M." seçeneğine göre listele

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    Characteristics and biogas potential of extended aeration activated sewage sludge
    (WFL Publisher Ltd., 2014) Çoban, V.; Çagman, S.; Eyidogan, M.; Kaya, D.
    As a result of the gradual decrease in the rural population and developments in urbanisation within the last century, the emerging problem of domestic wastewater was tried to be solved with wastewater treatment plants. Haphazardly release of wastewater from households into the nature causes water contamination at rivers, lakes and underground waters because it contains heavy metals. Water contamination is caused by the collapsible, dissolved or suspended chemical and biological substances within wastewater. These chemical and biological substances in wastewater while decomposing in the nature, release odours, decrease the amount of dissolved oxygen in the waters and lead to the development of weeds and algae. Wastewater released to the environment without any treatment has also affected plant, animal, and human health negatively. In this study, characteristics and biogas potential of Extended Aeration Activated Sewage Sludge were defined using anaerobic treatment methods. Dry matter, organic dry matter, chemical oxygen demand, ammonium nitrogen and various heavy metal analyses were carried out and the obtained results throughout the study were presented.
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    Effects of various nitrogen rates to biogas production yield in anaerobic digestion of only chicken manure
    (2014) Çoban, V.; Saraç, H.I.; Durmus, K.; Eyidogan, M.; Çagman, S.
    High nitrogen content of chicken manure might reach to the degree of toxic effect at anaerobic fermentation system. Raw material nitrogen ratio and the rate of demineralization in the reactor are important parameters in anaerobic reactor design. In this study, effects of various nitrogen contents on biogas production yields were investigated in order to obtain base limits at design phase of biogas plants which will run only chicken manure. All trials were carried out in a continuous stirred-tank reactor (CSTR) at mesophilic conditions. There was no pH adjustment made during trials. The stirrer works at a speed of 20 rpm and they worked every 2 minutes with intervals of 2 min. Reactor loading rate was increased each week in the following sequence 0,5, 1, 2 and 3 g.oDM/l.d. The effect of various nitrogen contents were observed with TKN and NH4-N analysis and also recorded daily biogas production yields. As a result, when there was no pH adjustment made, pH went up to alkali side and reached up to 8-8,5 with increasing loading rate. At this stage, nitrogen inhibition started and the biogas production yield was decreased 54% at the loading rate was as high as 3 g.oDM/l.d. Reflection of the trial results that organic nitrogen demineralization rate should be assumed around 60-70% at stabilize biogas production yield conditions.
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    Energy exergy efficiencies and environmental effects of mixed fuelled (solid plus gas) industrial facility steam boiler
    (Elsevier Sci Ltd, 2013) Kaya, D.; Eyidogan, M.; Ozkaymak, M.; Turhan, F.; Kilinc, E.; Kayabasi, E.; Sahin, Z.
    In this paper, an experimental study has been performed for mixed (solid + gas) fuelled boiler operating at 7000 kPa pressure and 778.15 K temperature with a nominal capacity of 25 kg s(-1) in order to find improvement in the boiler efficiency and to reduce its environmental emissions. In this scope, while the boiler was working under operating conditions, temperature, pressure, velocity, and combustion gas measurements were performed and the measured data were used to establish mass and energy balance. Main efficiency loses were identified as operation of the boiler with high excess air factor (39.78%), leakage air in the rotary air hater and surface thermal losses. Calculations, were performed with the use of measured data, estimated that the boiler and second law efficiency were calculated as 85.3 and 39.6% respectively. When the injected heat value on water is 67 433.65 kW in the boiler, by the reduction of excess air factor is 550 kW and by the prevention of leakage air is 1251.6 kW, including totally saving amount is 1801.7 kW. Financial value of this saving was calculated about 309 465$.