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Research on the treatment of two kinds model urban wastewater (W1, W2) with the contents of edible oil were carried out by activated sludge method in the membrane bioreactor. Biodegradation degree for readily and sparingly biodegradable compounds was determined on the basic of COD, BOD and TOC removal. The treatment of model wastewater by activated sludge method at the concentration range of 0.21 Á 0.78 g BOD ×/g(1 d(1 yielded TS the efficiency from 95.6 to 77.1% (BOD), from 99.2 to 88% (COD) and from 95 to 98.3% (TOC) for the first wastewater and from 89.8 to 73.2% (BOD), from 99.3 to 77.4% (COD) and from 88.7 to 98.6% (TOC) for the second wastewater. The use of an ultrafiltration membrane instead of the secondary settling tank increased the efficiency of wastewater treatment. Moreover, a method preparation of samples and determination of the specific compound (betulinol), naturally occurred in oil, is presented by the use of LLE Á GC/MS. Method mentioned above was applied to the determination of betulinol removal during wastewater treatment (W2).

The treatment of wastewater containing 0.1% oil emulsion, NH4Cl and KH2PO4 in BT across the assumed range of substrate loadings revealed a decrease in the basic wastewater pollution indexes, that is, BOD and COD by 95.6 Á 77.1% and 99.2 Á 88%, respectively. An adverse effect of rapeseed oil on the operation of the bioreactor was also observed. The treatment of the wastewater containing 0.1% oil emulsion and fermentation broth produced better results in the membrane bioreactor than in BT. The effectiveness of the process at the highest loading was 73.2% (BOD) and 77.4% (COD) in BT while in MB it reached 94.5% (BOD) and 92.2% (COD). A decrease in a substrate loading resulted in an increase in the effectiveness of betulin removal. The use of MB produced better effectiveness of wastewater treatment than the bioreactor coupled with a secondary settling tank. The tests employed a similar loading.