Energy-efficient municipal wastewater treatment –  Can deammonification be competent under mainstream conditions?

  • In most municipal wastewater treatment plants (MWWTPs) that employ activated sludge systems for nitrogen (N) removal, aeration accounts for approximately 50–60 % of all electricity consumption. Deammonifikation (DEA) is well-recognized as an energy–efficient technology although its mainstream implementation is still questionable. The aim of the presented work was to determine the operational window of various deammonifying sludges (S1–S7) in NRW from side of MWWTPs with respect to the operational factors temperature (8–50 °C), pHvalue (3.5–10.5), and COD/N ratio (0.5–6). Efficiencies up to 3 mg N L⁻¹h⁻¹were achievable even below 15 °C except for S6. All of the sludges except S6 achieved an elimination rate of more than 2.08–16 mg N L⁻¹ h⁻¹ in the main stream pH range (7–8). At a COD/N ratio > 1.5, the metabolism of DEA was disturbed. Although N/DN was suspected to have occurred at higher COD/N ratio, no increase in elimination rate was observed for most of the sludges. All the sludges fulfilled the minimum requirement of N-elimination rate (2.08 mg N L⁻¹h⁻¹ ), which leads to a comparable reactor volume to conventional WWTP. A large-scale implementation of a main stream DEA in full stream cannot yet be recommended on the basis of these results but semi-technical trials.

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Metadaten
Author:Dheeraja CheenakulaORCiD, K. B. Griebel, Simone KrafftORCiD, Isabel KuperjansORCiD, Markus Grömping
DOI:https://doi.org/10.1002/cite.202255057
Parent Title (English):Chemie Ingenieur Technik
Publisher:Wiley-VCH
Place of publication:Weinheim
Document Type:Conference Poster
Language:English
Year of Completion:2022
Date of first Publication:2022/08/25
Volume:94
Issue:9
First Page:1367
Last Page:1368
Note:
ProcessNet and DECHEMA‐BioTechNet Jahrestagungen 2022 together with 13th ESBES Symposium 2022, 12. - 15. September 2022, Eurogress Aachen
Note:
Corresponding author: Dheeraja Cheenakula
Link:https://doi.org/10.1002/cite.202255057
Zugriffsart:weltweit
Institutes:FH Aachen / Fachbereich Bauingenieurwesen
FH Aachen / Fachbereich Chemie und Biotechnologie
FH Aachen / Fachbereich Energietechnik
FH Aachen / Nowum-Energy