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Indexed by:期刊论文

Date of Publication:2013-08-15

Journal:CHEMICAL ENGINEERING JOURNAL

Included Journals:SCIE、EI、Scopus

Volume:230

Page Number:19-26

ISSN No.:1385-8947

Key Words:Single-stage autotrophic nitrogen removal; Co-immobilization; Partial nitrification; Anammox

Abstract:In this study, we developed an effective strategy to achieve single-stage autotrophic nitrogen removal by co-immobilizing partial nitrifying and anaerobic ammonia oxidation (anammox) biomass. Batch experiments were carried out to determine the optimum dissolved oxygen concentration of 1.5 mg/L, and the optimum biomass ratio of partial nitrifying biomass versus anammox biomass of 1:2. In continuous experiment, the total nitrogen removal rate reached 1.69 g N/L/d (nitrogen loading rate up to 2.2 g N/L/d). At the stable running stage, the TN average removal efficiency reached 77%. Scanning electron microscopy observations showed microorganisms greatly increased after 80 days cultivating. FISH analysis indicated that most anammox cells agglomerated in groups and ammonia oxidizing bacteria formed a thick layer around anammox cells. (C) 2013 Elsevier B.V. All rights reserved.