Importance of Some Industrial Waste Products as a Carbon Source for SCP Production from Yeasts PDF

Keywords

Single cell protein, protein for animal feed, industrial waste products .

Abstract

Yeast isolate of Candida tropicalis1369 was grown on a source of carbon waste material of corn cob a waste product of paper indusry (corn cob liquor) as a substrate for SCP production . The best concentration of corn cob liquor is 30 % for Yeast growth in the presence of 0.5% KH2PO4 % 0.3 &(NH4)2SO4 . On flask level scale the total number of yeast is 1.4 x 108 cell / ml. and the dry weight 2.5 g/ liter . On lab fermenter scale using batch culture technique the highest yeast yield is 3.1 g/l, by continuous culture technique using an incremental addition process the yield is 8.3 g/l, with dilution rate of 0.26 per hr .Candida tropicalis 24 was grown on a waste product of starch industry from corn (corn steep liquor CSL ) , the best concentration of CSL is 15% in the presence of 0.2 % of sodium citrate as a growth enhanced factor and at PH 5.0 . The highest optical density is 2.0 & 2.4 on a level of flask and lab fermenter respectively . The dry weight is 3.0 & 5.5 on a level of flask and lab fermenter respectively . Candida utilis 9255 was grown on fusel a waste product of ethyl alcohol industry , the optical density is 2.29 and the dry weight is 5.2 g/l on a level of lab. fermenter while the optical density is 2.53 and the dry weight is 5.5 g/l in the presence of pure ethanol . The researcher recommond the possiblitiy of using these waste products as acarbon source for SCP production and to remove harmful effects of them on the enviroment.