Modeling drying kinetics of grape seeds and skins from Turkish cultivars

Download
index.pdf
2011
Gezer, Pervin Gizem
Show full item record
186
views
304
downloads
Grape pomace is a valuable waste product and various end-products have been obtained after treatments. Recently, these have been commercialized due to their health-promoting effects. Drying is a crucial part of these treatments. This study aimed to analyze the drying kinetics of grape pomace parts, which are seeds and skins. Two grape types were used in this study, namely Emir and Bogazkere varieties of Vitis Vinifera species. Seeds and skins of each variety were dried in a tray dryer at an air velocity of 1 m/s with four different air temperatures; 40, 50, 55 and 60°C. The drying curves showed that the drying r ate increased with the air temperature. Six different drying models were selected from the literature and the best fitted model was determined by application of appropriate statistical methods. It was found that for Bogazkere seeds; Modified Two Term Model, for Bogazkere and Emir skins; Modified Page Model and for Emir skins; Logarithmic Model gave the best fit. The effective moisture diffusivities of each type were found for each temperature and were determined by two different approaches, experimental and estimation. The values and variation of Deff / L2 with temperature were calculated and were found to be increasing with temperature and that the Deff / L2 values were larger for grape skins than grape seeds. Arrhenius type equation was used in order to explain the temperature dependency of Deff / L2.
Grape industry.
http://etd.lib.metu.edu.tr/upload/12612904/index.pdf
https://hdl.handle.net/11511/20578
Graduate School of Natural and Applied Sciences, Thesis

Suggestions

Application of ozonation and biotreatment for forest industry wastewater
Balcioglu, I. Akmehmet; Sarac, C.; Kivilcimdan, C.; Tarlan, E. (Informa UK Limited, 2006-12-01)
This research is focused on the integrated process for the treatment of bleached Kraft pulp mill effluents. Pre-ozonation of softwood and hardwood combined bleaching effluents at alkaline pH resulted in 50 and 44% COD abatement, respectively. Segregation of highly polluted streams of bleaching process can be recommended to reduce the cost of treatment since the COD removal yield of CEH effluents was higher than combined bleaching effluents. Moreover, biodegradability of CEH effluents in terms of BOD5/COD ra...
Bacterial cellulase production using grape pomace hydrolysate and synthetic sugar as sole carbon sources by shake-flask submerged fermentation
Kurt, Ayşe Sultan; Çekmecelioğlu, Deniz; Department of Food Engineering (2019)
Grape pomace is the major waste in the wine industry and it consists of high moisture content and residual sugars, which make it susceptible to rapid microbial spoilage. Thus, it needs to be disposed of with care to eliminate both environmental and health problems. The carbohydrate fraction of grape pomace is a fibrous material, and is an additional source of fermentable sugars to produce biofuel and hydrolytic enzymes. In this study, grape pomace hydrolysate was used for cellulase production with Bacillus ...
Comparison of non-catalytic and catalytic ozonation processes of three different aqueous single dye solutions with respect to powder copper sulfide catalyst
Pirgalioglu, Saltuk; Ozbelge, Tuelay A. (2009-07-01)
Treatment of textile wastewaters containing dyes has not been very successful by conventional methods such as biological treatment. In order to overcome this problem, ozonation based on the oxidation of organic pollutants has been studied by researchers. Catalytic ozonation and advanced oxidation processes (ACPs) are used in order to increase the efficiency of sole ozonation further. In this work, catalytic ozonation in the presence of copper sulfide (CuS) powder as a catalyst was investigated in the treatm...
Optimisation of antioxidant activity of grape cane extracts using response surface methodology
Karacabey, Erkan; Mazza, Giuseppe (2010-03-01)
Solid-liquid extraction and response surface methodology were used to optimise conditions for the antioxidant activity of grape cane extracts. The independent processing variables were ethanol concentration, temperature and solvent to solid ratio. Ethanol concentration and temperature significantly affected antioxidant activity measured by the Trolox equivalent antioxidant capacity (TEAC) assay and the oxygen radical absorbance capacity using fluorescein (ORAC(FL)) method (p 0.05). Antioxidant activity of ...
Production of lactic acid by simultaneous saccharification and fermentation of horse chestnut shell by using lactobacillus casei
Çetin, Zeynep Başak; Çekmecelioğlu, Deniz; Hamamcı, Haluk; Department of Food Engineering (2022-8-01)
Lactic acid is a multifunctional organic acid used as an acidifier, flavoring, or preservative in textile, food, pharmaceutical, and cosmetic industries. Bacterial fermentation is the most preferred method for lactic acid production, but the often-used refined sugar increases the cost of production. For this reason, a new environmentally friendly, sustainable, and low-cost carbon source is being researched. The seeds of horse chestnut are mostly used in the pharmaceutical industry for antioxidant production...
Citation Formats
P. G. Gezer, “Modeling drying kinetics of grape seeds and skins from Turkish cultivars,” M.S. - Master of Science, Middle East Technical University, 2011.
METU IIS - Integrated Information Service open@metu.edu.tr