Simultaneous carbon and nitrogen removal in anoxic-aerobic circulating fluidized bed biological reactor (CFBBR)

Environmental Technology
Y CuiAjay Patel

Abstract

Biological nutrient removal (BNR) in municipal wastewater treatment to remove carbonaceous substrates and nutrients, has recently become increasingly popular worldwide due to increasingly stringent regulations. Biological fluidized bed (BFB) technology, which could be potentially used for BNR, can provide some advantages such as high efficiency and a compact structure. This work shows the results of simultaneous elimination of organic carbon and nitrogen using a circulating fluidized bed biological reactor (CFBBR, which has been developed recently for chemical engineering processes. The CFBBR has two fluidized beds, running as anoxic and aerobic processes to accomplish simultaneous nitrification and denitrification, with continuous liquid recirculation through the anoxic bed and the aerobic bed. Soluble COD concentrations in the effluent ranging from 4 to 20 mg l(-1) were obtained at varying COD loading rates; ammonia nitrogen removal efficiencies averaged in excess of 99% at a minimum total hydraulic retention time (HRT) of 2.0 hours over a temperature range of 25 degrees C to 28 degrees C. Effluent nitrate nitrogen concentration of less than 5 mg l(-1) was achieved by increasing effluent recycle rate. No nitrite accumulation ...Continue Reading

Citations

Sep 16, 2017·Environmental Technology·Haolong WangGeorge Nakhla
Jul 20, 2005·Biotechnology and Bioengineering·Ajay PatelJingxu Zhu
Jan 19, 2007·International Journal of Developmental Neuroscience : the Official Journal of the International Society for Developmental Neuroscience·Yanxin WangPek-Lan Khong
Dec 1, 2010·Therapeutic Advances in Drug Safety·Sarah J Mitchell, Sarah N Hilmer
Oct 15, 2010·Water Environment Research : a Research Publication of the Water Environment Federation·Nabin ChowdhuryMohammad Islam
Apr 29, 2021·Environmental Technology·Lin WangYuanyuan Shao

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