Two modified sequencing batch reactors (SBRs), specially configured to consist of both oxic and anoxic zones, and be operated with only a single simultaneous oxic/anoxic phase in each treatment batch, were tested to evaluate their applicability in the treatment of rubber latex processing (RLP) wastewater. Reactor R1 was operated with a constant aeration, by contrast, reactor R2 was operated with an air flow varied from a lower rate in the early period of the reaction phase to a higher rate in the later period. The effects of the chemical oxygen demand (COD) to total nitrogen (TN) ratio and their loading rates on the performance of the modified SBRs in the simultaneous removal of organic matter and nitrogen from RLP wastewater were investigated. | Vietnam Journal of Science and Technology 56 (2) (2018) 236-245 DOI: EFFECTS OF COD/TN RATIO AND LOADING RATES ON PERFORMANCE OF MODIFIED SBRs IN SIMULTANEOUS REMOVAL OF ORGANIC MATTER AND NITROGEN FROM RUBBER LATEX PROCESSING WASTEWATER Duong Van Nam1, 2, Nguyen Hoai Chau2, 3, Hamasaki Tatsuhide4, Dinh Van Vien2, 3, Phan Do Hung2, 3, * 1 Institute of Materials Science, VAST, 18 Hoang Quoc Viet, Cau Giay, Hanoi Graduate University of Science and Technology, VAST, 18 Hoang Quoc Viet, Cau Giay, Hanoi 3 Institute of Environmental Technology, VAST, 18 Hoang Quoc Viet, Cau Giay, Hanoi 4 Faculty of Design Technology, Osaka Sangyo University, 3-1-1 Nakagaito, Daito City, Osaka, Japan 2 * Email: phdhung2000@ Received: 17 October 2017; Accepted for publication: 9 March 2018 Abstract. Two modified sequencing batch reactors (SBRs), specially configured to consist of both oxic and anoxic zones, and be operated with only a single simultaneous oxic/anoxic phase in each treatment batch, were tested to evaluate their applicability in the treatment of rubber latex processing (RLP) wastewater. Reactor R1 was operated with a constant aeration, by contrast, reactor R2 was operated with an air flow varied from a lower rate in the early period of the reaction phase to a higher rate in the later period. The effects of the chemical oxygen demand (COD) to total nitrogen (TN) ratio and their loading rates on the performance of the modified SBRs in the simultaneous removal of organic matter and nitrogen from RLP wastewater were investigated. It was observed that the performance of the two reactors in removal of COD and ammonium nitrogen (ammonium-N) was similar, and did not remarkably change when varying the COD/TN ratio, as well as COD and TN loading rates in the ranges of – gCOD/gN, – kgCOD⋅m-3⋅d-1 and – kgN⋅m-3⋅d-1, respectively. The average COD removal efficiencies were over 95 %. Ammonium-N was almost completely .
