Title
Fast start-up of a pilot-scale deammonification sequencing batch reactor from an activated sludge inoculum Fast start-up of a pilot-scale deammonification sequencing batch reactor from an activated sludge inoculum
Author
Faculty/Department
Faculty of Sciences. Bioscience Engineering
Publication type
article
Publication
Oxford ,
Subject
Chemistry
Biology
Source (journal)
Water science and technology. - Oxford
Volume/pages
61(2010) :6 , p. 1393-1400
ISSN
0273-1223
ISI
000276181100004
Carrier
E
Target language
English (eng)
Full text (Publishers DOI)
Abstract
Deammonification involves the combined application of aerobic and anoxic ammonium-oxidizing bacteria (AerAOB & AnAOB) and allows to treat wastewaters with a high ammonium concentration in a sustainable and cost-efficient way. So far, it could take more than one year to start up the process, even with the addition of AnAOB enriched inocula. In contrast, we started up a deammonifying reactor for the treatment of sludge digestate in less than four months without any AnAOB enriched inoculum. In a single sequencing batch reactor (SBR) of 3m(3), nitritation and anammox were performed without nitrite accumulation. Larger biomass aggregates (>1.0mm) had a typical reddish colour, but FISH also showed that small aggregates (<0.25mm) contained a considerable amount of AnAOB. The AerAOB were related to Nitrosomonas halophila, N. eutropha and N. halophila, and the AnAOB to "Candidatus Kuenenia & Brocadia", as shown by FISH. Our results show that the deammonification inoculum does not play an important role, and that the AnAOB can quickly develop under the proper aerational conditions. Nitrogen was removed stably at high nitrogen loading rates (740 mgN/L/d) and removal efficiency (90%).
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