Andrzej Szymański

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A representative alkylphenol Triton X-100 (having 9.5 oxyethylene subunits) was treated over 40 days under the conditions of the continuous flow activated sludge simulation test in a plant with aeration and denitrification chambers. Treated sewage was separated by sequential extraction with ethyl acetate and chloroform. The extracts were analysed by(More)
A procedure has been developed for the determination of non-ionic surfactants (NS) adsorbed on particles of alive and dead activated sludge. The procedure also enables the determination of adsorption of major biodegradation by-products: short-chained ethoxylates, long- and short-chained PEG. The basis of measurement is the determination of NS concentration(More)
Poly(ethylene glycols) (PEG) are the major metabolites of non-ionic surfactants (NS). Chains of PEG may be shortened due to further biodegradation. The separate determination of short- and long-chained PEG (SC- and LC-PEG) may be useful to control the biodegradation of NS and PEG. A scheme for the separation of a whole mixture of PEG into SC- and(More)
A compression-heat molding procedure was developed to fabricate poly(D,L-lactide-co-glycolide) (PLGA) controlled release drug delivery devices for the local treatment of tumors. The drug delivery devices were designed in the shape of a cylindrical millirod (1.6-mm diameter, 10-mm length), which allows them to be implanted by a modified 14-gauge tissue(More)
A set of studies was carried using a continuous flow biodegradation unit in order to isolate a microbial community capable of efficient and complete utilization of octylphenol ethoxylates from activated sludge. Increasing concentrations of Triton X-100 (in the range of 1-1000 mg/l) were applied over a time period of 35 days in order to select(More)
Biodegradation of two alpha-methyl branched oxo-alcohol ethoxylates (OAE) of different polydispersity: LIAL 125/14 BRD (LIALB) (broad M.W. distribution) and LIAL 125/14 NRD (LIALN) (narrow M.W. distribution), both having an average of 14 oxyethylene subunits (EO) and a C(12-15) alkyl moiety were tested under the continuous flow activated sludge conditions(More)
Mass spectrometric behaviour of mono- and di-carboxylated polyethylene glycols (PEGCs and CPEGCs) and carboxylated octylphenol ethoxylates (OPECs) are discussed. The tendency for ionisation (deprotonation, protonation and cationisation by alkali metal cations) of carboxylated PEGs was compared with that of non-carboxylated correspondents by using both(More)
Polycarbonate plastics (PC) containing bisphenol A (BPA) are used for production of bottles for water, containers for storage of food products, bottles for feeding infants, kitchen utensils, and some components of medical equipment. Trace amounts of BPA have been detected in water and food products kept in PC containers. It has been established that BPA can(More)
The hypothesis regarding preferential biodegradation of surfactants applied for enhancement of microbial hydrocarbons degradation was studied. At first the microbial degradation of sole Triton X-100 by soil isolated hydrocarbon degrading bacterial consortium was confirmed under both full and limited aeration with nitrate as an electron acceptor. Triton(More)
Composting of oiled bleaching earth with waste sludge and corn straw was carried out to investigate the ability of microorganisms to synthesize biosurfactants that might decrease the surface tension of composts. Analytical results and changes in the surface tension suggest that biodegradation of fatty by-products was the consequence of emulsifying(More)