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Biological hydrogen generation in the presence of excess sludge

Waligórska M., Seifert K., Łaniecki M.

Polish Journal of Chemical Technology

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2006

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Vol. 8, nr 3

119-121

EN

The possibility of the application of excess sludge in the photobiochemical hydrogen generation was tested. It was found that the non-treated or thermally hydrolyzed sludge was completely inactive. The hydrogen evolution was found only for the alkaline hydrolysis. During the optimization of the process, the best conditions for hydrogen generation were established: medium containing 20 - 50% of alkaline hydrolizate containing 10 or 20% of total solids (TS).

2

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

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2005

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R. 13, nr 2

47-52

EN

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.

3

The effect of waste phosphogypsum on the denitrification and desulfurication processes

Seifert K., Moska A., Domka F.

Physicochemical Problems of Mineral Processing

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2002

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Vol. 36

209-216

EN

The effect of waste phosphogypsum obtained after phosphoric acid production from apatites and phosphorites, on the processes of denitrification and desulfurication taking place with the use of bacteria from the genera Bacillus and Desulfotomaculum, have been investigated. It has been shown that the phosphogypsum concentrations used in the experiments were can serve as a sulphate source for the Desulfotomaculum bacteria. The phosphogypsum is not toxic towards the bacteria. The phosphogypsum has also been found to play the role of an electron acceptor in the processes of oxidation of simple organic substrates in the processes of bioreduction of nitrates or sulphates. In the optimum conditions of desulfurication in a medium containing the phosphogypsum, organic substrate and Desulfotomaculum ruminis bacteria, the degree of conversion is close to 90%, and a decrease of TOC reaches about 50%.

PL

Badano wpływ odpadowego fosfogipsu, powstającego podczas produkcji kwasu fosforowego z apatytów i fosforytów, na procesy denitryfikacji oraz dysymilacyjnej redukcji siarczanów, zachodzące z wykorzystaniem bakterii z rodzaju Bacillus oraz Desulfotomaculum. Wykazano, że w określonym zakresie stężeń testowany fosfogips nie działa toksycznie na proces namnażania bakterii i stanowi źródło siarczanów dla bakterii Desulfotomaculum. Ponadto stwierdzono, że może on pełnić rolę akceptora elektronów w procesach utleniania prostych substratów organicznych w procesie bioredukcji azotanów lub siarczanów. W optymalnych warunkach dysymilacyjnej redukcji siarczanów, zachodzącej w podłożu zawierającym fosfogips, substrat organiczny oraz bakterie Desulfotomaculum ruminis, stopień przemiany kształtuje się na poziomie 90%, a ubytek ChZT wynosi około 50%.