Biomedical subjects

E Rzechowska

Publications and source records attributed to E Rzechowska.

3 recordsLinked to original sources

PubMed1976

Studies on the biodegradation of nonionic surfactants applied in the polyester fiber industry. I. Activated sludge bacteria degrading the surfactants.

The paper presents characteristics of 76 strains of bacteria capable of utilizing nonionic surfactants Cirrasol FP, Cirrasol SF 200 and Cirrasol TCS as the source of carbon. The strains were isolated from two activated sludges adapted to the purification of wastes containing the above compounds at concentration 150--200 mg/l. The isolated strains belonged to the genera: Achromobacter, Alcaligenes, Arthrobacter, Flavobacterium, Mycobacterium, Nocardia, Pseudomonas and Xanthomonas. With load 0.11 mg surfactant/mg d.w./day bacteria belonging to Alcaligenes were dominating. With load 0.18--0.31 mg surfactant/mg d.w./day microorganisms were dominated by Pseudomonas. The highest intensity of degradation of the studied surfactant was shown by species: Alcaligenes viscolactis, Nocardia blackwellii and Pseudomonas rathonis.

Bacteria↗

PubMed1976

Studies on the biodegradation of nonionic surfactants applied in the polyester fiber industry. II. Effect of activated sludge load on microorganisms.

The effect of selected nonionic surfactants Cirrasol FP, Cirrasol SF 200 and Cirrasol TCS on activated sludge organisms purifying wastes from the polyestre fibre industry was studied. The toxic effect of the mentioned surfactants towards bacteria, protozoa, rotifera and nematoda occurred at loads exceeding 0.32 mg surfactant/mg d.w./day and in periods of large fluctuations of the employed loads. Morphological changes of activated sludge flocs are also observed in similar conditions.

Adaptation, Physiological↗

PubMed1976

Studies on the biodegradation of nonionic surfactants applied in the polyestre fibre industry. III. Effect of adaptation on the respiratory activity of organisms and on the biocenosis of inoculated sludge.

Manometric studies were conducted in 3 series. In the first one the sludge used for inoculation was non adapted to water purification containing surfactants. In the second and third series it was adapted to the sludge load 0.11 and 0.28 mg surfactant/mg d.w./day respectively. Increase in oxygen uptake was proportional to the degree of the adaptation of microorganisms only within limited range of surfactant concentration not exceeding 500 mg/l for Cirrasol FP and 1000 mg/l for Cirrasol SF and Cirrasol TCS. The toxic action of surfactants against Ciliata was noted at concentration above 100 mg/l and for Mastigota and Sarcodina above 500 mg/l, even by using adapted sludge for inoculation.

Adaptation, Physiological↗