A Cascade of Anoxic and Oxic Fluidized Bed Biofilm Reactors for Treatment of Synthetic Municipal Wastewater
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 l 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.
Document Type: Research Article
Publication date: February 1, 2012
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