International Journal of Applied Microbiology and Biotechnology Research
ISSN: 2053-1818
Vol. 3(6), pp. 49-61, July 2015
doi.org/10.33500/ijambr.2015.03.007



Velocity measurement in the steady state is useful to predict the operating conditions for an optimization of thermophilic anaerobic digestion

Sarra Maamri1* and Moussa Amrani2

1Laboratory of Soft Technology, Recovering, and Sustainable Development, Faculty of Science, M’Hamed Bougara University, Boumerdes, Algeria.
2Departement of Biology, Faculty of Science, M’Hamed Bougara University, Boumerdes, Algeria.

*To whom correspondence should be addressed. E-mail: sarah_maamri@yahoo.fr.

Received 13 January, 2015; Received in revised form 15 May, 2015; Accepted 27 May, 2015.

Abstract


Keywords:
Activated sludge, Dry matters, Recycled biomass, Initial rate, Biogas yield, Kinetic.


This work concerns an experimental study of the biochemical conversion of waste activated sludge (WAS) by thermophilic anaerobic digestion for its optimization, by considering the impact of the content of dry matters (DM) contained in the activated sludge and the ratio of recycled biomass (BR), on the production of biogas by anaerobic digestion. The second aspect of this research relates to the kinetic modeling of this biochemical conversion of the organic matter to biogas with an adapted mathematical model while resting on the initial velocity measurement in the steady state. The results obtained show that biogas production potential and biogas production rate increased with an increasing DM concentration. The Modified Gompertz equation was employed to model the biogas production at different substrate concentrations. The equation gave a good approximation of initial velocity which equal to the maximum biogas production (Rm) and the biogas yield potential (P) with correlation coefficient (R2) over 0.983. The Lineweaver and Burk plot is used to estimate the parameter of optimisation from the initial methane production rate and initial DM concentration , when maximum rate Rmax equal to 7,042 L d-1 and the affinity constant value km equal to 95,563 g kg-1 of DM at BR = 5%, the BR = 33% is the best in this study. The increased ratio of BR increased the rate of methane yields, and reduced the retention time.

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