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1 2005

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Catabolic activity of bacteria from the bacillus and desulfotomaculum genera in biodegradation of starch and starch-modified foil

Seifert K., Szymańska K., Wawrzak D., Domka F.

Ekologia i Technika

2005

R. 13, nr 2

47-52

The kinetics of the processes of denitrification and desulfurication conducted with bacteria from the Bacillus and Desulfotomaculum genera, respectively, in the medium in which the only source of organic carbon was starch or starch&modified polyethylene foil has been studied in laboratory conditions. The most active were the Bacillus licheniformis bacteria, both in the medium with starch and with starch&modified foil. After the removal of starch, being the source of carbon for the bacteria, the foil which was the polyethylene matrix was destroyed. During 28 days of observation no effect of the Desulfotomaculum bacteria on the degradation of starch or starch&modi-fied foil was noted. The deformation and the loss of starch grains in the polyethylene foil was observed under a microscope and the degree of starch or starch&modified foil biodegradation was controlled by the measurement of the concentration of nitrates and nitrites in the denitrification reaction and sulphides in the desulfurication reaction at certain time intervals.