EMCB-ENVIS Node ENVIRONMENTAL BIOTECHNOLOGY

EMCB-ENVIS Centre
"river water test". It was found that only partial degradation took place while pyridinium
chlorides constituted main energy and carbon source. Presence of biodegradation intermediate
products was shown on the basis of 1H NMR analysis. Intermediates were not toxic to any
biotests.
Ewa Liwarska-Bizukojc, Stanislaw Ledakowicz. (Department of Environmental Engineering,
Technical University of Lodz, Al. Politechniki 6, 93-590 Lodz, Poland Author for
correspondence. Department of Bioprocess Engineering, Technical University of Lodz,
Wolczanska 213/215, 93-005 Lodz, Poland). Stoichiometry of the Aerobic
Biodegradation of the Organic Fraction of Municipal Solid Waste (MSW).
Biodegradation, 14(1) (2003), 51-56.
An elemental analysis was applied to describe the composition of the organic fraction of
municipal solid waste (MSW). The initial elemental composition was constant at5H8.5O4N0.2.
The changes of the composition during the biodegradation process and the final waste
composition were strictly dependent on the process conditions. The decrease in carbon content
due to biodegradation increased with temperature at which the experiments were conducted,
from 20% at 20 °C to about 40% at 37–42 °C after 96 hours. It was correlated with the amount of
oxygen that was utilised in the investigated processes of aerobic biodegradation of the waste
suspension. The amount of oxygen required for biodegradation of organic fraction of MSW was
estimated on the basis of stoichiometric equations and increased from 0.92 moles per 1 mole of
waste at 20 °C to 1.6 moles at 42 °C within 96 hours of the experiments.
F Solano-Serena, R Marchal, T Huet, J -M Lebeault, J -P Vandecasteele. (Institut Français
du Pétrole, Département de Microbiologie, 1 & 4 avenue de Bois Préau, 92852 Rueil-
Malmaison Cedex, France. Université de Technologie de Compiègne, Centre de Recherches
de Royallieu, BP 60319, 60203 Compiègne Cedex, France). Biodegradability of volatile
hydrocarbons of gasoline. Applied Microbiology and Biotechnology, 54(1) (2000), 121 –
125.
The biodegradability under aerobic conditions of volatile hydrocarbons (4-6 carbons) contained
in gasoline and consisting of n-alkanes, iso-alkanes, cycloalkanes and alkenes, was investigated.
Activated sludge was used as the reference microflora. The biodegradation test involved the
degradation of the volatile fraction of gasoline in closed flasks under optimal conditions. The
kinetics of biodegradation was monitored by CO2 production. Final degradation was determined
by gas chromatographic analysis of all measurable hydrocarbons (12 compounds) in the mixture
after sampling the headspace of the flasks. The degradation of individual hydrocarbons was also
studied with the same methodology. When incubated individually, all hydrocarbons used as
carbon sources, except 2,2-dimethylbutane and 2,3-dimethylbutane, were completely consumed
in 30 days or less with different velocities and initial lag periods. When incubated together as
constituents of the light gasoline fraction, all hydrocarbons were metabolised, often with higher
velocities than for individual compounds. Cometabolism was involved in the degradation of
dimethyl isoalkanes.
Flemming Ingerslev, Bent Halling-Sørensen. (Institute of Pharmaceutical and Analytical
Chemistry, Section of Environmental Chemistry, Royal Danish School of Pharmacy,
Universitetsparken 2, Copenhagen, DK-2100, Denmark). Biodegradability of
Metronidazole, Olaquindox, and Tylosin and Formation of Tylosin Degradation
Products in Aerobic Soil–Manure Slurries. Ecotoxicology and Environmental Safety,
48(3) (2001), 311-320.
The use of veterinary drugs (primarily antibiotics) in animal husbandry harbors the risk that
these compounds end up in the farmland when manure is used as fertilizer. The biodegradability
of three compounds, olaquindox (OLA), metronidazole (MET), and tylosin (TYL), was
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