Biotechnology for the value addition of waste waters and residues from cassava processing industries
1995
Balagopalan, C. | Ray, R.C. | Sheriff, J.T. | Rajalekshmy, L.
Waste waters from starch and sago factories, if treated properly, could be recycled for irrigation and aquaculture besides improving the quality of life around processing factories. Residues could be processed to value-added products using conventional and new biotechnological methods. By incubation and filtration, cyanide concentration in waste water was brought down to 0.6 micro g/ml from an initial concentration of 28.45 micro g/ml. Cyanide-degrading microorganisms indicated the possibility of developing a consortium of microorganisms to remove cyanide from waste waters and the environment of cassava processing industries. Co-culturing experiments with Endomycopis fibuliger and Candida utilis showed that the BOD level of effluents could be reduced to 5.1 g/l from an initial value of 38.0 and the COD level to 6.7 g/l from 20.0. The concomitant SCP production was 20 g/100 ml. Solid-state fermentation with fungal cultures could elevate the total protein content of the residues. It was possible to separate food-grade industrial starch from the residues of cassava processing industries by treating with pectinase and cellulase. The starch recovery was 7.1 percent, 15.9 percent and 37.0 percent when the concentration of enzymes was 0.2 percent, 0.3 percent and 0.4 percent respectively. Saccharification of residues with dilute hydrochloric acid, amylase enzymes (singly and in combination with cellulase and pectinase), resulted in fermentable sugars ranging from 5.43 percent to 10 percent. Results of the experiments showed possibilities of application of biotechnology for recycling waste waters and utilization of residues from cassava processing industries for value added products.
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