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Indexed by:期刊论文

Date of Publication:2016-01-15

Journal:BIOCHEMICAL ENGINEERING JOURNAL

Included Journals:SCIE、EI

Volume:105

Page Number:306-313

ISSN No.:1369-703X

Key Words:CANON; Microbial growth; Biofilms; Bioreactors; Waste-water treatment; Community structure

Abstract:Completely autotrophic nitrogen-removal over nitrite (CANON) has been considered as a promising nitrogen-removal technology in treating high ammonia and high temperature wastewater. In this study, the exact effect of different temperatures on process performance and microbial features based on two lab-scale CANON reactors was investigated. Results showed extraordinary nitrogen removal performance with mean total nitrogen (TN) removal efficiency of 80.01% and 66.90% under high TN removal loading of 2.09 kg m(-3) d(-1) and 1.02 kg m(-3) d(-1) at 30 degrees C and ambient temperature (16-23 degrees C) respectively. Biodiversity analysis indicated Nitrosomonas-related aerobic ammonia oxidizing bacteria (AerAOB) and Candidatus Brocadia-like anaerobic ammonia oxidizing bacteria (AnAOB) were predominant functional microorganisms that coexisted without distinguishable niche on the volcanic carriers in both two CANON reactors. Temperature could noticeably impact functional bacterial population: the population of AerAOB and AnAOB decreased to one to two orders of magnitude whereas Nitrospira and Nitrobacter increased at ambient temperature. Based on the bacterial experimental results, some feasible strategies have been discussed to improve the bioactivity and increase the function bacterial population, aiming at enhancing nitrogen-removal capacity at ambient temperature. (C) 2015 Elsevier B.V. All rights reserved.