Zerrin Günkaya

Utilization of Waste Clay from Boron Production in Bituminous Geosynthetic Barrier (GBR-B) Production as Landfill Liner

Bituminous geomembranes, one type of geosynthetics, include a hot bituminous mixture with mineral filler and reinforcement. In this study, boron production waste clay (CW) was used as filler to produce a geosynthetic barrier with bentonite, waste tire, and bitumen. Bentonite and waste tires were used as auxiliary fillers and bitumen as the binder. CW/bitumen, CW/bentonite/bitumen, and CW/waste tire/bitumen mixtures were prepared by using a laboratory mixer at 100°C. Hot mixtures were extruded into strips by using a lab-scale corotating twin screw extruder (L/D: 40) followed by die casting (2 mm × 100 mm). Glass fleece or nonwoven polyester was used as reinforcement material and while die casting, both sides of the reinforcement materials were covered with bituminous mixture. Thickness, mass per unit area, tensile strength, elongation at yield, and hydraulic conductivity were used to characterize the geomembranes. Among all geomembranes, nonwoven polyester covered with 30% bitumen-70% boron waste clay mixture (PK-BTM30CW70) was found to be the most promising in terms of structure and mechanical behaviour. After that, consequences of its exposure to distilled water (DW), municipal solid waste landfill leachate (L-MSW), and hazardous waste landfill leachate (L-HW) were examined to use for an innovative impermeable liner on solid waste landfills.

PLASTİK ATIKLARDAN KARBON NANOTÜP (CNT) ÜRETİMİ ÜZERİNE BİR DEĞERLENDİRME

Plastikler gunluk yasantida ve endustriyel uretimde her alanda yogun bir sekilde kullanilmaktadir. Ihtiyaclari karsilamak icin kullanilan plastiklerin cogu kisa surede atiga donustugu icin plastik atik miktari da oldukca fazla olmaktadir. Mevcut durumda bir kismi geri donusturulen, yakilan ya da depolanan plastiklerin hem cevresel hem de saglik acisindan yarattigi olumsuzluklari azaltmak adina bu atiklari urune donusturebilecek alternatif yontemler arastirilmali ve uygulanmalidir. Bu noktadan hareketle, bu calismada plastik atiklarin degerli bir malzeme olan karbon nanotup (CNT) uretiminde kullanimi ele alinmistir. Plastik atiklarla ilgili mevcut veriler, uygulama alanlari degerlendirilmis, CNT uretimi ile ilgili kisa bir bilgi verilmis ve bu proseste karbon kaynagi olarak plastik turlerinin kullanimi irdelenmistir.Plastics are heavily used in every field of daily life and industrial production. Most of the plastics used to meet the requirements are converted to waste in a short time, so the amount of plastic waste is considerably high. Alternative methods of converting these waste into product should be investigated and applied in order to reduce the environmental and health hazards of some recycled, burned or stored plastics in the current situation. From this point of view, this study deals with the use of plastic waste in the production of carbon nanotube (CNT), a valuable material. Present data and application areas related to plastic wastes were evaluated, brief information about CNT production was given and the use of plastic types as carbon source in this process was examined.

Utilisation of waste clay from boron production as a landfill liner material

Abstract The objective of this study was to investigate the potential utilisation of waste clay from boron production in sanitary landfills. The waste clay (CW) was mixed with bentonite (B) and waste tyre (TW) at different ratios. Results show that, any of the CW-TW mixtures were not acceptable to use in landfills because of insufficient bearing capacity values. On the other hand, CW and 2B/98CW mixtures have sufficient values from the point of experimental tests. As a conclusion, it has been concluded that CW can be used as a liner material for landfills without an addition.

Effect of orange peels waste derived biocomposite film against aflatoxins

Bu çalışmada yenilikçi bir ürün olarak, portakal kabuğu atıklarından üretilen biyokompozit ambalaj filmine, aflatoksin önleyici özellik kazandırılması üzerinde durulmuştur. Biyokompozit filmin içeriğini portakal kabuklarından elde edilen pektin jeli, termoplastik nişasta ve kil oluşturmaktadır. Biyokompozit film, aflatoksinleri inhibe etmek üzere, enterik kaplamalarda kullanılan aktif bir ilaç malzemesi olan Selüloz Asetat Ftalat (CAP) ile daldırma yöntemiyle kaplanmıştır. Aflatoksin oluşumunun belirlenmesinde hedef gıda olarak kuru üzüm kullanılmış, sterilize edilen kuru üzüm örneklerinde toplam aflatoksin analizi (B1, B2, G1, G2) yapılarak, başlangıç aflatoksin miktarı (mg/g üzüm) belirlenmiştir. Aflatoksin konsantrasyonunun belirlenmesinde ekstraksiyon yöntemi kullanılmış ve analiz fluorometrik test cihazıyla yapılmıştır. Filmlerin kuru üzümde mevcut aflatoksinlere ve yeni aflatoksin oluşumuna etkisinin belirlenmesi için iki set deney yapılmış, yeni toksin oluşumunun belirlenebilmesi için de Aspergillus parasiticus kullanılmıştır. Altı kuyucuklumikroplate konulan kuru üzüm örneklerinin üzerleri biyokompozit film, CAP kaplanmış biyokompozit film ve karşılaştırma amaçlı olarak ticari ambalaj filmi ile kaplanmış ve 25 °C’de 5 gün süre ile inkübe edilmiştir. İnkübasyon sonrası kuru üzümlerde de aflatoksin analizi yapılarak başlangıç değerleriyle birlikte irdelenmiştir. Sonuçlara göre CAP ile kaplamanın biyokompozit ambalaj filminin aflatoksin ve üretimi üzerindeki inhibisyon etkisini arttırdığı belirlenmiş, CAP kaplı biyokompozit filmin yeni aflatoksin oluşumunun önlenmesi açısından ticari ambalaj filmine göre daha etkin olduğu saptanmıştır. The aim of the study is to add an aflatoxin inhibition propertyto a novel biocomposite packaging film which is derived from orange peels waste and including thermo plastic starch and clay. Biocomposite film was coated with, Cellulose Acetate Phthalate (CAP), an enteric coating used as an active pharmaceutical ingredient, for aflatoxini nhibition. Total aflatoxin (B1, B2, G1, G2) analysis was realized on sterilized dry raisins. Before the test, all the dry raisins were sterilized and their initial total aflatoxin content (mg/g raisin) was determined. Then, a group of sterilized dry raisin were contaminated with Aspergillus parasiticus. Both sterilized and contaminated dry raisins were covered by the testing films and incubated at 25 °C forfivedays. After five days, final total aflatoxin contents in sterilized and contaminated dry raisin were measured to determine the existing aflatoxin and new aflatoxin growth, respectively. Total aflatoxin content was measured by a fluorometricmycotoxin test equipmentafterextraction. Resultsshowthat CAP has increased the inhibition effect of biocomposite film against existing aflatoxin and new synthesis. In addition to this, it was observed that CAP is more effective to new aflatoxin synthesis than commercial packaging film.