Organic acids production from cheese-whey

Download

index.pdf

Date

2006

Author

Türkmenoğlu, Seçil

Metadata

Show full item record

Item Usage Stats

216
views

94
downloads

In this study, production of organic acids from cheese-whey was studied. Optimization of organic acids production was performed in semi-batch and batch reactors. Two sets of experiments were performed. First set of experiments were performed in semi-batch reactors for the optimization of organic loading rate (OLR) and hydraulic retention time (HRT). As a result of Set 1 experiments optimum OLR was found to be 15 g COD l-1. Second set of experiments were performed in batch reactors by using the optimum OLR found in Set 1 experiments. Set 2 experiments were conducted to study the effect of using different seed cultures and Basal Media (BM) on Volatile fatty avid (VFA) production. Main acidogenesis products were acetic acid (Hac), butyric acid (Buty) and propionic acid (HPr) with smaller quantities of i-butyric acid (i-Buty), valeric acid (Val) and caproic acid (Cap). It was seen that BM had a suppressive effect on ethanol (EtOH) production while it stimulated the VFA production. Higher VFA productions and variety of VFA types were observed in Test Reactors seeded with acidogenic culture (R3 and R6).

Subject Keywords

Alchemy

URI

http://etd.lib.metu.edu.tr/upload/3/12607709/index.pdf
https://hdl.handle.net/11511/15972

Collections

Graduate School of Natural and Applied Sciences, Thesis

Suggestions

OpenMETU
Core

Vanadium and molybdenum incorporated mcm-41 catalysts for selective oxidation of ethanol Güçbilmez, Yeşim; Doğu, Timur; Department of Chemical Engineering (2005) In this study, V-MCM-41, MCM-41 and Mo-MCM-41 catalysts were synthesized by the one-pot alkaline and acidic synthesis methods. The as-synthesized catalysts were found to have high BET surface areas (430-1450 m2/g), homogeneous pore size distributions (2-4 nm), good crystalline patterns and high metal loading levels (Metal/Si atomic ratio in the solid = 0.01-0.16) as determined by the characterization studies. MCM-41 and Mo-MCM-41 catalysts were highly active in the selective oxidation of ethanol with conver...
Production of thermostable beta-galactosidase from tyhermophilic fungi for use in low-lactose milk production Soydan, Meltem; Ögel, Zümrüt Begüm; Department of Food Engineering (2006) The aim of this research was the production of beta-galactosidase from thermophilic fungi for use in low lactose milk production or other possible applications. For this purpose, three thermophilic fungi Humicola insolens, Torula thermophila and Thermomyces lanuginosus were screened for lactase production. Highest lactase activity was observed in Thermomyces lanuginosus. The carbon source inducing highest extracellular lactase production in Thermomyces lanuginosus was determined as arabinose. When grown on ...
Synthesis of ferrocenyl substituted pyrazoles Görmen, Meral; Zora, Metin; Department of Chemistry (2005) Pyrazoles have been studied for over a century as an important class of heterocyclic compounds and continue to attract considerable interest due to the broad range of biological activities they possess. The incorporation of the essential structural features of pyrazoles with a ferrocene moiety could provide new derivatives with unexpected and/or enhanced biological activities since several ferrocene derivatives have already been shown to be active against a number of tumors. For this reason, we investigated...
Photocatalytic properties and characterization of praseodymium-doped titanium dioxide DOĞU, Doruk; Karakaş, Gürkan (2018-01-01) In this study, Pr-TiO2 samples were synthesized using a sol-gel method. The effects of the calcination conditions on the structure and photocatalytic activity were examined, and the results are compared with pure TiO2 samples. The XRD analysis indicated that the anatase structure is stabilized by Pr, and rutile phase formation is inhibited by the addition of Pr. It was also observed that Pr doping enhances the surface area and inhibits the crystal growth. Photoluminescence analysis with 325 nm excitation sh...
Synthesis oil based hyperbranched resins and their modification with melamine formaldehyde resins Karakaya, Ceylan; Gündüz, Güngör; Department of Chemical Engineering (2005) In this research hyperbranched resins containing fatty acid residues like alkyds were synthesized. Dipentaerythritol which has six hydroxyl groups was used as the core molecule, and it was transesterified with (i) castor oil, and (ii) a mixture of castor oil and linseed oil at 240°C in the presence of sodium hydroxide as catalyst. The resulting molecule, in either case, was then esterified with dimethylol propionic acid at 140°C in the presence of p-toluene sulfonic acid as catalyst. Melamine-formaldehyde r...

Citation Formats

S. Türkmenoğlu, “Organic acids production from cheese-whey,” M.S. - Master of Science, Middle East Technical University, 2006.