Prayitno creator K. Udornsinrot Chairperson Vigneswaran, Saravanamuthu Examination Committee Tran, Francis T. Examination Committee USAID - Indonesian GPT II Project Scholarship Donor text th Bangkok Asian Institute of Technology 1989 monographic eng 65 p. A combination of anaerobic filter and rotating biological contactor system at laboratory scale was operated as one unit system to treat synthetic wastewater containing chromium. The soluble COD concentration of wastewater was varied at about 2000, 1400, and 800 mg/1. The combination system was operated at constant detention time, it was 4 hours in the AF unit and 20 hours in the RBC unit, resulting in organic loading rate of 2.02, 1.41 and 0.77 kg SCOD/m3 /d for the whole system or 12.31, 7.99 and 4.67 kg SCOD/m3/d for the anaerobic filter system. No significant differences on the organic carbon removal by varying the organic loading rate with chromium concentration of 5 mg/1 in wastewater. The removal efficiency of soluble COD was 97, 98, and 96 % and chromium removal efficiency was 98, 99, and 98 % for organic loading rate of 2.02, 1.41,and 0.77 kg SCOD/m3 /d respectively. Increasing chromium concentration up to 10 mg/l at organic loading rate of 0.81 kg SCOD/m3 /d was not influenced in SCOD removal as well as chromium removal efficiency. The combination of the anaerobic filter and rotating biological contactor was found to be effective and have a good performance for treating organic wastewater containing chromium in the wide range of organic loading. Half saturation constants in this system were 14.67 and 1000 mg/l for rotating biological contactor and anaerobic filter respectively. A thesis submitted in partial fulfillment of the requirements for the degree of Master of Science, School of Environment, Resources and Development Thesis (M.Sc.) - Asian Institute of Tehcnology, 1989 Sewage Purification Chromium removal Asian Institute of Technology. http://203.159.5.9/ait-thesis/detail.php?q=B18013 http://203.159.5.9/ait-thesis/detail.php?q=B18013 120399 20260817172714.0