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Kinetic analysis for biodesulfurization of dibenzothiophene using R. rhodochrous adsorbed on silica

Canales C., Eyzaguirre J., Baeza P., Aballay P., Ojeda J.

Ecological Chemistry and Engineering. S

2018

Vol. 25, nr 4

549--556

Experimental biodesulfurization (BDS) data for dibenzothiophene (DBT) (1.0-7.0 mM) with Rhodococcus rhodochorus immobilized by adsorption on silica, were adjusted with liquid-film kinetic model (Fisher coefficient, F = 592.74 and probability value p << 0.05 and r 2 = 0.97). Simulations predict the presence of considerable amounts of DBT surrounding the particles, which would be available for the cells adsorbed on the surface of silica. The greatest percentage removal (50 %) was obtained for adsorbed cell system over the suspended bacterial cells (30 %), showing that sulfur substrates are more bioavailable when the bacterial cells are adsorbed on silica. The liquid-film modelling with diffusional effects provides proper theoretical basis to explain the BDS performance obtained using adsorbed cells.

Screening of microorganisms able to biodegrade ethylbenzene

Wieczorek A., Przybulewska K.

Environment Protection Engineering

2006

Vol. 32, nr 4

47-52

New bacteria able to decompose ethylbenzene were searched for. Four active strains were isolated from used compost biofilters. They degraded styrene and exhausting gases from wire production plant as well as fresh compost. Their suspensions in mineral medium degraded ethylbenzene at the rates of about 6-56 g/m3/h. The most active bacteria were identified as Bacillus pumilus and Rhodococcus rhodochrous. The decomposers of styrene isolated in our previous research were not able to degrade ethylbenzene.

Poszukiwano nowych bakterii zdolnych do rozkładu etylobenzenu. Z przepracowanych złóż kompostowych biofiltrów degradujących styren i zanieczyszczenia gazów odlotowych z fabryki kabli oraz ze świeżego kompostu wyizolowano cztery aktywne szczepy. Ich zawiesiny w pożywce mineralnej rozkładały etylobenzen z szybkością od około 6 do około 56 g/m3/h. Najbardziej aktywne z nich zidentyfikowano jako Bacillus pumilus i Rhodococcus rhodochrous. Wyizolowane we wcześniejszej pracy bakterie rozkładające styren nie rozkładały etylobenzenu.