☆ 4.5 Article

Exploration of rapid start-up of the CANON process from activated sludge inoculum in a sequencing biofilm batch reactor (SBBR)

WATER SCIENCE AND TECHNOLOGY (2016)

期刊

WATER SCIENCE AND TECHNOLOGY

卷 73, 期 3, 页码 535-542

出版社

IWA PUBLISHING

DOI: 10.2166/wst.2015.518

关键词

anammox; CANON; partial nitrification; polymerase chain reaction-denaturing gradient gel electrophoresis; SBBR

类别

Engineering, Environmental Environmental Sciences Water Resources

资金

Natural Science Foundation of China [51408041]
Key Laboratory of Subsurface Hydrology and Ecological Effect in Arid Region of Ministry of Education (Xi'an, China)

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Protocol

Reagent

摘要

In this study, a laboratory-scale sequencing biofilm batch reactor (SBBR) was employed to explore a fast start-up of completely autotrophic nitrogen removal over nitrite (CANON) process. Partial nitrification was achieved by controlling free ammonia concentration and operating at above 30 degrees C; then the reactor was immediately operatedwith alternating periods of aerobiosis and anaerobiosis to start the anammox process. The CANON processwas successfully achieved in less than 50 d, and the total-nitrogen removal efficiency and the nitrogen removal ratewere 81% and 0.14 kg-N m(-3) d(-1) respectively. Afterwards, with the increasing of ammonium loading rate a maximum nitrogen removal rate of 0.39 kg-N m(-3) d(-1) was achieved on day 94. DNA analysis showed that 'Candidatus Brocadia' was the dominant anammox species and Nitrosomonas was the dominant aerobic ammonium-oxidizing bacteria in the CANON reactor. This study revealed that due to shortening the persistent and stable nitrite accumulation period the long start-up time of the CANON process can be significantly reduced.

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