Journal
CHEMOSPHERE
Volume 265, Issue -, Pages -Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.chemosphere.2020.129165
Keywords
Anammox; Partial nitrification (PN); Denitrifying phosphorus removal (DPR); Low C/N ratio; Biological nutrient removal
Categories
Funding
- National Natural Science Foundation of China [51578353, 51808367]
- Funding Project of Jiangsu Natural Science Research [BK20160356]
- Research Foundation of Suzhou University of Science and Technology [XKZ2018002]
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This study developed a novel DPR-PNA process for high-strength wastewater treatment, achieving highly-efficient total nitrogen, phosphorus, and CODcr removal efficiencies. Denitrifying phosphorus accumulating organisms were found to play a significant role in nutrient removal, particularly in deep-level nutrient removal.
This study developed a novel DPR-PNA (denitrifying phosphorus removal, partial nitrification and anammox) process for sustaining high-strength wastewater treatment in a modified continuous flow reactor without external carbon source. After 259-days operation, a synchronous highly-efficient total inorganic nitrogen, PO43--P and CODcr removal efficiencies of 88.5%, 89.5% and 90.1% were obtained, respectively even influent nitrogen loading rate up to 3.2 kg m(-3) d(-1). Batch tests revealed that denitrifying phosphorus accumulating organisms (DPAOs) using NO3--N as electron acceptors significantly enriched (74% in total PAOs), which emerged remarkable positive impacts on deep-level nutrient removal as the key limiting factor. Furthermore, the NO3--N inhibitory threshold value (similar to 20.0 mg L-1) for DPAOs was identified, which demonstrated as an inhibitory component in excessive recycling NOx--N. From the molecular biology perspective, Dechloromonas-DPAOs group (18.59%) dominated the excellent dephosphatation performance, while Nitrosomonas-AOB (ammonia oxidizing bacteria) group (16.26%) and Candidatus_Brocadia-AnAOB (anammox bacteria) group (15.12%) were responsible for the desirable nitrogen loss process. Overall, the present work highlighted the novel DPR-PNA process for nutrients removal is a promising alternation for wastewater of high nitrogen but low carbon. (C) 2020 Elsevier Ltd. All rights reserved.
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