January 2022
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32 Reads
SSRN Electronic Journal
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January 2022
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32 Reads
SSRN Electronic Journal
May 2019
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287 Reads
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24 Citations
SN Applied Sciences
The anammox process is an economically favourable nitrogen removal process; however, low growth rates of anammox biomass block its more widespread application. As different approaches on techniques for anammox bacteria growth acceleration were tested, this study focused on long-term evaluation of hydrazine addition in the start-up phase. Effect of hydrazine addition (dose 3.7 mgN2H4 dm⁻³) was investigated in a pilot-scale SBR treating ammonia-rich reject water from sludge dewatering after partial nitritation process, and effects were compared to a reference reactor. Hydrazine addition resulted in much higher anammox biomass enrichment observed as higher nitrogen removal rate [0.512 kgN (m³ d)⁻¹ with hydrazine versus 0.256 kgN (m³ d)⁻¹ without reagent]. Sludge from chemically stimulated reactor revealed also higher (by 22.6%) specific anammox activity rate than the reference. After the hydrazine addition was stopped, observed process rates remained stable and no regression in the nitrogen removal efficiency could be noticed. In the final phase, nitrogen removal rate was only 48.7% of process rate in the reactor previously stimulated by hydrazine. Results of the experiment confirmed positive effect of hydrazine presence on anammox bacteria enrichment process.
... Introducing pyrrhotite (FeS) accelerated AnAOB growth in 18 days, surpassing 96 % TNRE in a lab UASB system [115]. Conversely, Miodoński et al. [116] used 3.7 mg/L of N 2 H 4 for rapid anammox initiation in a pilot SBR for sidestream wastewater treatment. This dosage was maintained over 36 days, resulting in an NRR of 0.519 g/L/d of N. ...
May 2019
SN Applied Sciences