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  • Title: A cascade of anoxic and oxic fluidized bed biofilm reactors for treatment of synthetic municipal wastewater.
    Author: Chen YW, Wang JM, Zang CL, Huang Q, Liu MQ, Zhu SM, Shen SB.
    Journal: Water Environ Res; 2012 Feb; 84(2):128-33. PubMed ID: 22515062.
    Abstract:
    In this study, a cascade of anoxic and oxic fluidized bed biofilm reactors system was carried out to treat synthetic municipal wastewater. The parameters of the influent flow rates and C/N ratios were discussed. System performance was acceptable for chemical oxygen demand (COD), ammonia, and total nitrogen removal. A decrease of ammonia and total nitrogen removal efficiencies, however, was observed when the influent flow rates increased to 5.04 and 6.12 1 h(-1). Total nitrogen removal decreased at the influent C/N ratio of 3:1. The measured ratios of COD reduction in the anoxic column to nitrogen removal through nitrification-denitrification were 3.7, 3.5, 3.3, and 3.1 g COD/g(-1) N on average when the influent C/N ratios changed from 6:1 to 3:1. The observed sludge yield (Yobs) was 0.169 g VSS g COD(-1) because of perfect denitrification in the anoxic column and the relatively long solids retention time.
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