Circulating fluidized bed biological reactor for nutrients removal |
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| Authors: | Yubo CUI Hongbo LIU Chunxue BAI |
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| Institution: | (1) Department of Environmental Engineering, Dalian Nationalities University, Dalian, 116600, China;(2) School of Environmental Science and Engineering, Tianjin University, Tianjin, 300072, China;(3) Dalian Development Zone Drainage Management Ltd., Dalian, 116600, China |
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| Abstract: | A new biological nitrogen removal process, which is named herein “The circulating fluidized bed bioreactor (CFBBR)”, was developed
for simultaneous removal of nitrogen and organic matter. This process was composed of an anaerobic bed (Riser), aerobic bed
(Downer) and connecting device. Influent and nitrified liquid from the aerobic bed enters the anaerobic bed from the bottom
of the anaerobic bed, completing the removal of nitrogen and organic matter. The system performance under the conditions of
different inflow loadings and nitrified liquid recirculation rates ranging from 200% to 600% was examined. From a technical
and economic point of view, the optimum nitrified liquid recirculation ratewas 400%. With a shortest total retention time
of 2.5 h (0.8 h in the anaerobic bed and 1.5 h in the aerobic bed) and a nitrified liquid recirculation rate of 400% based
on the influent flow rate, the average removal efficiencies of total nitrogen (TN) and soluble chemical oxygen demand (SCOD)
were found to be 88% and 95%, respectively. The average effluent concentrations of TN and SCOD were 3.5 mg/L and 16 mg/L,
respectively. The volatile suspended solid (VSS) concentration, nitrification rate and denitrification rate in the system
were less than 1.0 g/L, 0.026-0.1 g NH4
+-N/g VSS·d, and 0.016–0.074 g NOx
−-N/g VSS·d, respectively.
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Translated from Environmental Engineering, 2007, 25(6): 2, 7–10 译自: 环境工程] |
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| Keywords: | circulating fluidized bed nitrification denitrification nitrified liquid recirculation rate |
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