Anaerobic digestion of waste biomass from the production of L-cystine in suspended-growth bioreactors

Author:

Chávez-Fuentes Juan José1,Hutňan Miroslav1,Bodík Igor1,Zakhar Ronald1,Czölderová Marianna1

Affiliation:

1. Department of Chemical and Environmental Engineering, Faculty of Chemical and Food Technology, Institute of Environmental Engineering, Slovak University of Technology in Bratislava, Radlinského 9, Bratislava 812 37, Slovakia

Abstract

Waste biomass from the industrial production of the amino acid L-cystine contains above-average concentrations of organic pollutants and significant concentrations of nitrogen and sulfur. The specific biogas production (SBP) of waste biomass was monitored in parallel suspended-growth laboratory anaerobic bioreactors. After severe inhibition was observed, three different procedures were applied to inhibited reactor sludge to counter-attack the inhibitory effects of sulfides, respectively hydrogen sulfide: micro-aeration, dilution with water and precipitation by ferrous iron cations. The performance of bioreactors was weekly monitored. Organic loading rates (as chemical oxygen demand, COD) ranged from 1.07 to 1.97 g L−1 d−1. At the end of the experimentation, SBP averaged 217, 300 and 320 l kg−1 COD with a methane content of 21%, 52% and 54%; specific sludge production averaged 133, 111 and 400 g total solids kg−1 COD, and inhibition was 49%, 27% and 25%; for the applied procedures of micro-aeration, dilution and precipitation respectively.

Publisher

IWA Publishing

Subject

Water Science and Technology,Environmental Engineering

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