ASSESSMENT OF SUBSTRATE REMOVAL CHARACTERISTICS ACCORDING TO ACCLIMATION PERIODS BY OUR AND NUR TESTS

In this study, substrate removal characteristics were analyzed to reduce the cost of external carbon dosage at Sudokwon Landfill Site Management Corporation in Korea by utilizing oxygen uptake rate (OUR) and nitrate uptake rate (NUR) tests. To estimate and evaluate the substrate removal characteristics obtained by the batch tests, the lab-scale MLE process was operated. By-products of J Co. (sugar manufactory) and S Co. (fine chemical industry) were selected as the concerned carbon sources through a comparison of carbon and nitrogen contents. MeOH was tested as a control experiment. Until the steady slate, the fraction of RBDCOD<SUB>OUR</SUB> concentration to COD concentration of J Co., S Co. by-products and MeOH increased and reached levels of 98%, 82%, and 100%, respectively. During the 20th operating day, the fraction of RBDCOD<SUB>NUR</SUB> concentration to COD concentration was 95%, 81%, and 83%, respectively. These fractions of RBDCOD<SUB>NUR</SUB> concentration to RBDCOD<SUB>OUR</SUB> concentration increased according to acclimation periods and reached levels of 99%, 97%, and 81%, respectively, on the 20th day. The results obtained from the lab-scale MLE process operation using the concerned carbon sources as external carbon were similar to that observed by OUR and NUR tests.