Yazar "Saglam, M." seçeneğine göre listele
Listeleniyor 1 - 7 / 7
Sayfa Başına Sonuç
Sıralama seçenekleri
Öğe Biological denitrification in drinking water treatment using the seaweed Gracilaria verrucosa as carbon source and biofilm carrier(Water Environment Federation, 2006) Ovez, B.; Mergaert, J.; Saglam, M.Chemical and microbiological aspects were investigated with regard to biological denitrification of drinking water using the seaweed Gracilaria verrucosa as the carbon and energy substrate and as physical support for the microbial flora in semibatch, fixed-bed reactors. Complete removal of nitrate (100 mg/L) was readily achieved without accumulation of nitrite. Microbiological analysis indicated that the effluent of the reactor contained high numbers of bacteria (> 10(6)/mL total count). Among the 44 bacterial strains isolated directly from the samples or isolated after enrichment at 37 degrees C, 25 different fatty acid profiles were found, indicating a complex microflora, including potential pathogens.Öğe Classification of volatile products evolved at fast co-pyrolysis of Goynuk oil shale with low density polyethylene(Estonian Acad Publishers, 2008) Salepcioglu, S.; Gungoren, T.; Sert, M.; Erdem, S.; Saglam, M.; Yuksel, M.; Ballice, L.Fast co-pyrolysis of Goynuk oil shale (GOS) with low density polyethylene (LDPE) was investigated. The aim of the research was to determine the distribution of volatile products and conversion of blends at different temperatures and time intervals. Pyrolysis of oil shale, LDPE and co-pyrolysis of oil shale-LDPE blend of the total carbon ratio of 1:1 were performed by using the fast pyrolysis method in an isothermal pyrolysis reactor. Volatile organic products eluted from the reactor were collected at different temperatures and time intervals by using a special sampling technique. Fast pyrolysis products were analyzed by capillary gas chromatography. In the aliphatic fraction of pyrolysis products, n-paraffins and 1-olefins were classified by their carbon number. The effect of co-pyrolysis on conversion of total organic carbon into volatile products was identified by determination of the experimental and the hypothetical mean values. Possible synergetic effect was investigated by comparing the results on fast pyrolysis of GOS and LDPE. The effect of co-processing of GOS with LDPE was determined by calculating the difference between experimental and hypothetical mean value of conversion of total organic carbon into volatile products. The experimental conversion of the blend to volatile hydrocarbons was found to be lower than hypothetical mean value of conversion at co-pyrolysis, and thus, no synergetic effect was observed.Öğe EFFECT OF MINERAL MATTER ON PRODUCT YIELD AND COMPOSITION AT ISOTHERMAL PYROLYSIS OF TURKISH OIL SHALES(Estonian Academy Publishers, 2009) Sert, M.; Ballice, L.; Yuksel, M.; Saglam, M.This study was aimed to investigate the effect of mineral matter of Goynuk oil shales (GOS) on pyrolysis and product evolution. Organic part was separated from mineral matter before pyrolysis in an isothermal pyrolysis reactor. In the demineralization step, carbonate, pyrite and silicates were removed from kerogen by using HCl, HNO(3) and HF, respectively. Thereafter all samples were pyrolized in an isothermal pyrolysis apparatus. The temperatures for pyrolysis experiments were 450, 500, 550, 600, 650 degrees C. Recoveries of volatiles and total hydrocarbons increased with increasing temperature. At pyrolysis of silicate-free oil shale (GOS-F), volatile hydrocarbon recovery (VHR) increased nearly by 10 wt.% as compared with VHR from raw oil shale sample (GOS-R) at each pyrolysis temperature. Carbon content of solid residue was also calculated. The effect of mineral content of oil shale on product yield and composition was determined by establishing carbon balance in the reactor. The amount of solid residue decreased as a function of demineralization degree. The pyrolysis reaction in the presence of silicate mineral showed the catalytic effect of silicate minerals aiding coking reactions, and carbon deposition decreased averagely by 20 wt.% in silicate-free oil shale compared with the value for GOS-R at each temperature.Öğe THE EFFECTS OF ACID TREATMENT ON THE PYROLYSIS OF GOYNUK OIL SHALE (TURKEY) BY THERMOGRAVIMETRIC ANALYSIS(Estonian Academy Publishers, 2012) Sert, M.; Ballice, L.; Yuksel, M.; Saglam, M.The present study investigates pyrolysis kinetics of raw and pretreated Goynuk oil shales by thermogravimetric analysis (TGA). Samples were treated with HCl, HNO3 and HF solutions and characterized by TGA data. All experiments were carried out at a heating rate of 5 K min(-1), in the temperature range of 25-1000 degrees C under the nitrogen atmosphere. Coats-Redfern method was used to determine the kinetic parameters of the activation energy using the data from thermogravimetric analysis. From the kinetic analysis it was concluded that Goynuk oil shale samples have two reaction regions and the activation energies of the first region are lower.Öğe Fast pyrolysis of Sirnak Asphaltite (Turkey) and characterization of pyrolysis products(Taylor & Francis Inc, 2008) Sert, M.; Ballice, L.; Yuksel, M.; Saglam, M.; Erdem, S.Fast pyrolysis of Srnak Asphaltite (SASP) was investigated to determine yield and distribution of volatile products at different temperatures. A special sampling technique was used for collecting organic products formed at different time intervals and pyrolysis temperatures. The fast pyrolysis products were analyzed by capillary gas chromatography. The total product evolution rate was determined for a time range with 10 minutes at each pyrolysis run. n-Paraffin and 1-olefin in aliphatic fraction of pyrolysis products were classified by their carbon number. The evolution of volatile hydrocarbons increased with increasing temperature. The conversion of organic carbon to aliphatic hydrocarbons was found to be 5.9, 8.5, 12.9, 21.2, and 26.6 wt% at 450 degrees C, 500 degrees C, 550 degrees C, 600 degrees C, and 650 degrees C, respectively.Öğe Improving the flame retardancy properties of PLA/PC blends(KeAi Communications Co., 2023) Seki, Y.; Saglam, M.; Aker, S.; Isbilir, A.; Sarikanat, M.; Altay, L.Polylactic acid/Polycarbonate (PLA/PC) blend was prepared via twin screw extruder by taking the bio-based content as much as possible and the better mechanical, thermal, and impact properties into consideration. Flame retardant (FR) performance of the PLA/PC blend was improved by using the mixture of ammonium polyphosphate, triphenyl phosphate, and zinc borate. FR properties of PLA/PC blend was evaluated according to the UL 94 test standard. The variations in tensile and flexural strength, and Izod-notched impact strength values were determined. In order to reduce the total amount of flame retardant additive, instead of using a mixture of TPP and APP (weight ratio of 2/1) at 21 wt% weight fraction, 1 wt% Zinc borate together with 18 wt% TPP-APP mixture was used and obtained V0 rating for the thickness of 1.5 mm. It was reported that weight fraction of flame retardant additives (APP and TPP) was successfully reduced by using a mixture of APP, TPP and ZnB without degrading the mechanical properties such as tensile and flexural strengths. Using less total FR additive weight (19 wt%) led to 15 and 24% higher tensile and flexural strength values, respectively, compared to higher FR additive weight (21 wt%). © 2023 Kingfa Scientific and Technological Co. Ltd.Öğe Upgrading scrap tire derived oils using activated carbon supported metal catalysts(Taylor & Francis Inc, 2007) Ucar, S.; Karagoz, S.; Yanik, J.; Yuksel, M.; Saglam, M.Scrap tire derived oils were upgraded over metal-loaded activated carbon catalysts and commercial catalyst at different operating conditions. Activated carbon support was prepared from the pyrolytic carbon black from pyrolysis of scrap tires. Activated carbon catalysts contained the metal pairs of Co- Ni, Co- Mo, and Ni- Mo. All metal-loaded activated carbon catalysts showed similar catalytic activity for upgrading process at 350 degrees C under hydrogen pressure of 7 MPa. However, Ni- Mo/ Ac showed good catalytic activity. Liquid fuels from upgrading oils over Ni- Mo/ Ac and commercial catalyst containing 45-55% of naphtha fraction, 20-25% of kerosene fraction was obtained 350 degrees C under hydrogen pressure of 7 MPa.
