Browsing by Author "Kocaman, Ayhan"

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Al2o3/Sio2 Nanoparticles-Coated Tio2 Catalyst on the Exhaust Pollutants of a Diesel Engine
(Springer Heidelberg, 2021) Ergani, Songul Kaskun; Kocaman, Ayhan; Akinay, Yuksel
In this study, the effect of the catalytic converter (cc) coated with Al2O3/SiO2/TiO2 catalyst on the exhaust emissions of CO, NOX and HC was measured at 0, 25, 50, 75 and 100% load conditions from the diesel engine. Al2O3/SiO2-coated TiO2 powders were prepared by wet impregnation method and then coated to 32 pieces of 11 x 11 cm aluminium wire mesh plate by calcination method. The synthesised catalyst characterization was performed by XRD, EDX, SEM analyses and UV spectrophotometer. The exhaust emissions of CO, HC and NOX from the diesel engine were measured by GA-4040 gas analyser with and without a catalytic convertor. The emission results were evaluated for statistical analysis by IBM SPSS 22 Statistic Data Editor. Hence, it was seen that the modified catalytic convertor represented 43.05% reduction of NOX emission as a maximum at 75% load. Moreover, 56.84% decrease was seen in HC emissions as a maximum at 25% load. Furthermore, CO emissions reduction was measured to be 66.7% as maximum at 25% load. Consequently, the results of this experimental study showed that the catalytic converter coated with Al2O3/SiO2/TiO2 catalyst greatly reduced the exhaust emissions from the diesel engine and the synthesised catalyst can be alternative to overwhelm air pollution problem emitted from transportation.
Development of Organic Phosphorus Vermicompost From Raw Phosphate Rock Using Microorganisms and Enzymes and Its Effect on Tomato Yield
(Elsevier, 2023) Turan, Metin; Kocaman, Ayhan; Tufenkci, Sefik; Katircioglu, Hikmet; Gunes, Adem; Kitir, Nurgul; Yildirim, Ertan
Chemical phosphorus and other chemical fertilizers undergo certain changes in the soil. These changes cause crop yield loss because of changes in soil pH and EC. In addition, other toxic compounds accumulate. They also lead to serious soil contamination and threaten the environment. In this study, vermicompost was developed from raw phosphate rock by using microorganisms and phosphorus solubilizing enzymes (protease, lipase, dehydroge & PRIME;nase, hydrolase, urea, nitrogenesis, cellulose) to eliminate phosphorus deficiency in soil. Two-year greenhouse trials were conducted to determine the effectiveness of the organic phosphorus humus produced after six months of mineralization, and tomato plants were grown. As a result of these experiments, the effects on yield and physicochemical properties of the tomato plant were studied. Earthworm fertilizer at a rate of 4500 kg ha-1 increased the tomato yield of 22.12% compared to the control application, in the two-years means. In addition, the effect on nutrient content of tomato plants resulted in statistically significant increases (p < 0.05). When the macronutrient concentrations in the leaves of the plant were examined, they were considered to have reached the level of sufficiency. It was also found that the content of amino acids, chlorophyll and antioxidants in the tomato plant reached the highest levels compared to the control application. Based on our results, it was concluded that this organic fertilizer will contribute to higher crop yields in plants of cultural and commercial importance and to other plant growth parameters.
Development of Plant-Friendly Vermicompost Using Novel Biotechnological Methods
(Springer, 2023) Kocaman, Ayhan; Turan, Metin; Tufenkci, Sefik; Katircioglu, Hikmet; Gunes, Adem; Kitir, Nurgul; Yildirim, Ertan
For the first time in the world, raw tea waste from tea plants was mineralized by rapid biotechnological methods using beneficial worms, enzymes (protease, lipase, dehydrogenase, hydrolase, urease, nitrogenase, cellulase) and microorganisms (Aspergillus flavus, Bifidobacterium spp. Bacillus subtilis, Rhodotorula spp., Lactobacillus, Rhodopseudomas spp.). Thus, biocompost technology was developed to create an exclusive organic tea fertilizer. The biocompost product was developed in a plant-friendly format for sustainable use of local resources. It was rich in organic material and free from diseases and pathogens, according to organic farming methods. It was also reliable in terms of heavy metal content. In the biocompost study, the application of five different compost mixtures and three different application methods were investigated. Worm + Plant Growth-Promoting Rhizobacteria + enzymes accelerated the mineralization of the compost among the studies, and the lowest C/N and OM % ratio was obtained. The other physical and chemical parameters were also in accordance with the ideal values determined in the literature. Also, the increase of nitrogen without nitrogen loss during the composting process shows that mineralization was successfully completed. In concluded, it can be suggested that the developed organic worm compost fertilizer can be used on agricultural land and in regenerative agriculture.