Wpływ obciażenia osadu czynnego ładunkiem zwiazków organicznych na obecność wolnych kwasów tłuszczowych w ściekach

The impact of various organic loading values (measured as BOD₅) of activated sludge in the range of < 0.2 gO₂/(g·d), 0.2-0.4 gO₂/(g·d) and > 0.4 gO₂/(g·d) on the treatment effectiveness of synthetic municipal wastewater with an addition of edible rape oil was investigated. The wastewater biodegradation was conducted by an activated sludge method under aerobic conditions. The process effectiveness was evaluated on the basis of the amount of organic compounds present, i.e. COD as well as free long-chain fatty acids (LCFAs). The LCFA content in wastewater was determined by the proprietary method employing gas chromatographer Saturn 2100T (Varian) with individual fatty acid standards and their mixture (C8:0-C24:0). In the raw wastewater the highest concentration of saturated palmitic acid (46-156 mg/m³) and of unsaturated oleic (78-180 mg/m³) and linoleic (0-190 mg/m³) acids was observed. It was demonstrated that in the bioreactors both a decrease and an increase in the free LCFA concentration did take place. At the same time, a slow decrease in COD within 24 hours of the process was recorded.