TY - JOUR N2 - Results of the studies for determining fractions of organic contaminants in a pretreated petrochemical wastewater flowing into a pilot Aerated Submerged Fixed-Bed Biofilm Reactor (ASFBBR) are presented and discussed. The method of chemical oxygen demand (COD) fractionation consisted of physical tests and biological assays. It was found that the main part of the total COD in the petrochemical, pretreated wastewater was soluble organic substance with average value of 57.6%. The fractions of particulate and colloidal organic matter were found to be 31.8% and 10.6%, respectively. About 40% of COD in the influent was determined as readily biodegradable COD. The inert fraction of the soluble organic matter in the petrochemical wastewater constituted about 60% of the influent colloidal and soluble COD. Determination of degree of hydrolysis (DH) of the colloidal fraction of COD was also included in the paper. The estimated value of DH was about 62%. Values of the assayed COD fractions were compared with the same parameters obtained for municipal wastewater by other authors. L1 - http://www.czasopisma.pan.pl/Content/85182/PDF/05-paper-Trojanowicz.pdf L2 - http://www.czasopisma.pan.pl/Content/85182 PY - 2016 IS - No 3 September EP - 382 DO - 10.1515/cpe-2016-0030 KW - Chemical Oxygen Demand fractions KW - petrochemical wastewater KW - biofilm reactor A1 - Wójcik, Włodzimierz A1 - Trojanowicz, Karol PB - Polish Academy of Sciences Committee of Chemical and Process Engineering VL - vol. 37 DA - 2016 T1 - Carbonaceous materials in petrochemical wastewater before and after treatment in an aerated submerged fixed-bed biofilm reactor SP - 373 UR - http://www.czasopisma.pan.pl/dlibra/publication/edition/85182 T2 - Chemical and Process Engineering ER -