Treatment of ion-exchange monosodium glutamate waste water by yeast

Two strains of yeasts, Candida halophila and Rhodotorula glutinis, were acquired through screening from ion-exchange monosodium glutamate wastewater(IEMGW) which was characterized by its high contents of COD (40690mg/L), NH4+ -N (16914mg/L) and SO42- (18000mg/L). The mixture of the two species had a good COD removal performance for treating IEMGW in a pH rang of 4 [similar to] 9. The yeast technology was superior to the conventional activated sludge in terms of COD removal and COD decomposition rate, In a dilution rate range of wastewater from 1:1 to 1:9, a COD removal of 84.5% and an average COD decomposition rate of over 1.0 kg/(kg·d) were obtained under an initial pH of 4.