Indexed by:期刊论文

Date of Publication:2009-02-01

Journal:BIORESOURCE TECHNOLOGY

Included Journals:SCIE、PubMed

Volume:100

Issue:4

Page Number:1548-1554

ISSN No.:0960-8524

Key Words:Simultaneous nitrogen and COD removal; ANAMMOX; Partial nitrification; Denitrification; Biofilm

Abstract:The simultaneous partial nitrification, ANAMMOX and denitrification (SNAD) process was validated to potentially remove ammonium and COD from wastewater in a single, oxygen-limited, non-woven rotating biological contactor (NRBC) reactor. An ammonium conversion efficiency of 79%, TN removal efficiency of 70% and COD removal efficiency of 94% were obtained with the nitrogen and COD loading rate of 0.69 kg N/m(3) d and 0.34 kg/m(3) d, respectively. Scanning electron microscopy (SEM) observation and fluorescence in situ hybridizations (FISH) analysis revealed the existence of the dominant groups of bacteria. As a result, the aerobic ammonia-oxidizing bacteria (AOB), with a spot of aerobic heterotrophic bacteria were mainly distributed in the aerobic outer part of the biofilm. However, ANAMMOX bacteria with denitrifying bacteria were present and active in the anaerobic inner part of the SNAD biofilm. These bacteria were found to exist in a dynamic equilibrium to achieve Simultaneous nitrogen and COD removal in NRBC system. (C) 2008 Elsevier Ltd. All rights reserved.