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.

Links

Publisher Full Text

Authors

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

Institution

State Key Laboratory of Materials-Oriented Chemical Engineering, College of Biotechnology and Pharmaceutical Engineering, Nanjing University of Technology, Nanjing, P R China.

Source

Water environment research : a research publication of the Water Environment Federation 84:2 2012 Feb pg 128-33

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