Abstract
The anaerobic ammonium oxidation (anammox) process is one of the most energy efficient and environmentally-friendly bioprocess for the treatment of the wastewater with high nitrogen concentration. The aim of this work was to study the influence of the high nitrogen loading rate (NLR) on the nitrogen removal in the laboratory-scale anammox sequencing batch reactor (SBR), during the shift from the synthetic wastewater to landfill leachate. In both cases with the increase of NLR from 0.5 to 1.1 – 1.2 kg N/m3d, the nitrogen removal rate (NRR) increases to about 1 kg N/m3d, but higher NLR caused substrates accumulation and affects anammox process efficiency. Maximum specific anammox activity was determined as 0.638 g N/g VSSd (NRR 1.023 kg N/m3d) and 0.594 g N/g VSSd (NRR 1.241 kg N/m3d) during synthetic and real wastewater treatment, respectively. Both values are similar and this is probably the nitrogen removal capacity of the used anammox biomass. This indicates, that landfill leachate did not influence the nitrogen removal capacity of the anammox process.
Highlights
The anaerobic ammonium oxidation process is one of the most energy efficient and environmentally-friendly bioprocess for the removal of nitrogenous contaminants from wastewater
In phase I reactor was operated with average nitrogen loading rate (NLR) 0.634 ± 0.026 kg N/m3d and nitrogen removal rate (NRR) 0.504 ± 0.030 kg N/m3d (SD)
Ammonium and nitrite start accumulating in the reactor, and nitrogen removal efficiency dramatically dropped to 44% on day 128
Summary
The anaerobic ammonium oxidation (anammox) process is one of the most energy efficient and environmentally-friendly bioprocess for the removal of nitrogenous contaminants from wastewater. The nitritation-anammox process helps to reduce significantly the oxygen demand 60%) and to eliminate the need for an organic carbon source As a consequence, it reduces operational costs (up to 60%), what is one of the most important advantages. Free ammonia and nitrites can strongly inhibit anammox process [3]. For these reason, substrate concentration and nitrogen loading rate (NLR) control is an important strategy to preventing process inhibition
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