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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 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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  • Publisher Full Text
  • Authors

    Chen YW, Wang JM, Zang CL, Huang Q, Liu MQ, Zhu SM, Shen SB

    Source

    MeSH

    Aerobiosis
    Anaerobiosis
    Biofilms
    Bioreactors
    Nitrogen Compounds
    Oxygen
    Time Factors
    Waste Disposal, Fluid
    Water Pollutants, Chemical
    Water Purification

    Pub Type(s)

    Journal Article
    Research Support, Non-U.S. Gov't

    Language

    eng

    PubMed ID

    22515062