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Öğe Dephenolization of olive mill wastewater by pellets of some white rot fungi(Hacettepe Üniversitesi, 2011) Aytar, Pınar; Gedikli, Serap; Çelikdemir, Meltem; Uzuner, Süleyman; Farizoglu, Burhanettin; Şam, Mesut; Çabuk, Ahmet; Sağlam, NecdetBu çalışmada bazı beyaz çürükçül fungusların gelişen hücrelerinin fenol giderim etkinliklerinin değerlendirilmesi amaçlanmıştır. Deneyler, Trametes versicolor ATCC200801, Phanerochaete chrysosporium ME446 ve Pleurotus ostreatus kullanılarak hem zeytin kara suyu ortamında hem de besin içeren zeytin kara suyu ortamında gerçekleştirilmiştir. Belirlenen fenol giderimi ile inkübasyon süresi sonunda ölçülen hücre dışı enzim aktivitesi arasında bir ilişki kurulabilmiştir. Bu nedenle enzimatik fenol giderimi deneyleri de gerçekleştirilmiştir. Hücresel fenol giderimi ile ilgili olarak en uygun suş; T.versicolor ATCC200801, optimum inkübasyon süresi; 9 gün, zeytin kara suyu dilüsyonu; %15, yetiştirilen ortam; besin eklemeksizin zeytin kara suyu ortamı olarak seçilmiştir. Bu çalışmada adaptasyon basamağı, ön işlem ve besin eklemeye ihtiyaç duyulmadan %97 fenol giderimi elde edilmiştir. Zeytin kara suyu ile ilgili yapılmış önceki çalışmalarda elde edilen bu bulgulara rastlanılmamıştır.Öğe Desulphurization of some low-rank Turkish lignites with crude laccase produced from Trametes versicolor ATCC 200801(Elsevier, 2011) Aytar, Pınar; Gedikli, Serap; Sam, Mesut; Ünal, Arzu; Çabuk, Ahmet; Kolankaya, Nazif; Yurum, AlpIn this paper, data obtained during the oxidative desulphurization of some low-rank Turkish lignites with crude laccase enzyme produced from Trametes versicolor ATCC 200801 are presented. In order to optimize desulphurization conditions, effects of incubation time, pulp density, incubation temperature, medium pH, and also lignite source on the desulphurization have been examined. The values for incubation period, pulp density, temperature and pH in optimum incubation condition were found as 30 min, 5%, 35 degrees C, and pH 5.0, respectively. Under optimum conditions, treatment of coal samples with crude laccase has caused nearly 29% reduction in their total sulphur content. During the study, the rate of desulphurization of coal sample provided from Tuncbilek with crude laccase was found to be relatively higher than the other examined coal samples. Results of analytical assays have indicated that the treatment of coals with crude laccase has caused no change in their calorific values but reduced their sulphur emissions. 35%, 13%, and 25% reductions of pyritic sulphur, sulphate and organic sulphur in a period of 30 min were achieved, for a particle size of 200 mu m under optimal conditions with enzymatic desulphurization. Also, statistical analyses such as Tukey Multiple Comparison tests and ANOVA were performed. (C) 2010 Elsevier B.V. All rights reserved.Öğe Laccase production with Submerged and solid state fermentation: Benefit and cost analysis(Hacettepe Üniversitesi, 2011) Demir, Aynur; Aytar, Pınar; Gedikli, Serap; Çabuk, Ahmet; Arısoy, MünevverBu çalışmanın amacı, katma değer ürünlerin üretimlerine sahip biyoteknolojik süreçlerden katı faz ve batık fermentasyon teknikleri ile enzim üretiminin, fayda maliyet analizini değerlendirmektir. Fayda maliyet analiz yaklaşımı projenin karar verilmesinde ve değerlendirilmesinde genelde kullanılan bir yoldur. Bu analiz, çevresel biyoteknolojide önemli bir enzim olan lakkazın üretiminde kullanılan iki yöntemle ilgilidir. Karşılaştırma sonucuna göre, katı faz fermentasyonla elde edilen lakkaz aktivitesinde fayda/maliyet oranı 1.76 ve aktivite değeri 22.62 U ml-1 olurken batık fermentasyonla elde edilen lakkaz aktivitesi içinse bu değer 2.42 ve aktivite değeri 29.08 U ml-1’dir. Özellikle batık fermentasyonla elde edilen indüklenmiş sıvı kültürü, üretim faaliyetinin maksimum fayda sağladığı ve minimum maliyet getirdiği görülmektedir. Bu durum bir şirket için bu tip fermentasyonla lakkaz üretiminin daha cazip olduğunu göstermektedir.Öğe Sequential treatment of olive oil mill wastewater with adsorption and biological and photo-Fenton oxidation(SPRINGER HEIDELBERG, 2013) Aytar, Pınar; Gedikli, Serap; Şam, Mesut; Farizoğlu, Burhanettin; Çabuk, AhmetOlive oil mill wastewater (OMWW), a recalcitrant pollutant, has features including high phenolic content and dark color; thereby, several chemical or physical treatments or biological processes were not able to remediate it. In this study, the treatment efficiencies of three treatments, including adsorption, biological application, and photo-Fenton oxidation were sequentially evaluated for OMWW. Adsorption, biological treatment, and photo-Fenton caused decreasing phenolic contents of 48.69 %, 59.40 %, and 95 %, respectively. However, after three sequential treatments were performed, higher reduction percentages in phenolic (total 99 %) and organic contents (90 %) were observed. Although the studied fungus has not induced significant color reduction, photo-Fenton oxidation was considered to be an attractive solution, especially for color reduction. Besides, toxicity of OMWW treatment was significantly reduced.Öğe Silk fibroin/nylon-6 blend nanofilter matrix for copper removal from aqueous solution(SPRINGER, 2015) Yalçın, Eda; Gedikli, Serap; Çabuk, Ahmet; Karahaliloğlu, Zeynep; Demirbilek, Murat; Bayram, Cem; Şam, Mesut; Sağlam, Necdet; Denkbaş, Emir BakiHeavy metal pollution has become a serious problem for living organisms. In this study, silk fibroin (SF)/nylon-6 nanofiber matrices were formed by electrospinning and their surface was modified with calcium phosphate (CaP) crystals to increase the affinity of divalent heavy metals. The properties of matrices were evaluated as a filter matrix for copper adsorption from aqueous solution. Attenuated total reflectance fourier transform infrared spectroscopy (ATR-FTIR), scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy (EDXS), X-ray photoelectron spectroscopy (XPS), and alizarin red staining method were used for characterization. Adsorption studies were performed by batch and continuous system. The various parameters regarding adsorption process such as pH of solution, surface area, initial copper concentration, and flow rate were optimized. Toxicity values were assessed before and after the Cu(II) adsorption studies. The resultant SF/nylon-6 nanofiber matrices indicate an excellent fibrous structure without beads (fiber diameter at 250 +/- A 50 nm) and modified successfully with CaP crystals. Adsorption results showed that the removal efficiency of copper could reach 32 % by continuous flow system whereas 77 % by batch system. Acute toxicity bioassays using Vibrio fischeri showed that the toxicity decreased after continuous and batch flow systems. For desorption study, different concentrations of various desorption solutions were used and the percentage of Cu(II) desorption was determined as 11 %, approximately.
