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© Research
Publication : Process Biochemistry

DEFINITION OF OPTIMAL CONDITIONS FOR THE HYDROLYSIS AND ACIDOGENESIS OF A PHARMACEUTICAL MICROBIAL BIOMASS

Scientific Fields
Diseases
Organisms
Applications
Technique

Published in Process Biochemistry - 01 Jan 1997

PENAUD V; DELGENES JP; TORRIJOS M; MOLETTA R; VANHOUTTE B; CANS P

Process biochemistry, 32(6), 1997, pp. 515-521

Abstract

The effect of operational parameters such as hydraulic retention time(HRT), influent substrate concentration (So), pH, temperature and recycling on the acidogenic digestion of a pharmaceutical biomass was investigated. The total COD content of the pharmaceutical effluent used was 50 g/litre, only 13.6% occurred in soluble form and consisted mostly of protein (22 g/litre). Substrate degradation was quantified in terms of COD, protein and carbohydrate degradation. Variations in COD solubilization were mainly due to protein solubilization. The best results, in terms of COD solubilization and concentrations of produced VFA, were obtained at pH = 8.5, T = 35 degrees C and OLR = 5.4 gCOD/litre/day. Under these conditions 50.6% of the initial COD content was solubilized and 17.1 g/litre of volatile fatty acids (VFA) were produced. Recycling of biomass resulted in greater COD solubilization but in loweracidogenic activity. Moreover, the effluent of the acidogenic reactorshowed poor settling properties. (C) 1997 Elsevier Science Ltd.

http://www.sciencedirect.com/science/journal/13595113/32/6