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Author:

Du, Rui (Du, Rui.) | Liu, Qingtao (Liu, Qingtao.) | Xu, Xinyi (Xu, Xinyi.) | Horn, Harald (Horn, Harald.) | Cao, Shenbin (Cao, Shenbin.) | Peng, Yongzhen (Peng, Yongzhen.)

Indexed by:

EI Scopus SCIE

Abstract:

The novel partial denitrification coupling with the anammox (PD/A) process is emerging as a promising alternative for cost-efficient nitrogen removal from wastewater. However, it encounters challenges of competition with heterotrophic denitrification for NO2--N and inhibition of complex organic carbon involved in wastewater. This work demonstrated the efficient and stable nitrogen removal from nitrate-containing wastewater (NO3--N of 20-400 mg/L) with organic carbon from domestic wastewater (NH4+-N of 60.8 +/- 5.6 mg/L, COD of 195.6 +/- 58.4 mg/L) by a single-stage PD/A process. The efficient NO2--N generation was achieved by utilizing organic carbon in domestic wastewater. With the feed volume ratio of nitrate-containing wastewater to domestic wastewater (V-NO3/V-dom) decreasing from 2.4/0.6 to 0.5/2.5, the removal efficiency of NH4+-N and NO3--N achieved 84.2% and 98.3%, respectively. Anammox bacteria were found to strongly compete over denitrifying bacteria with the contribution of the anammox pathway to total nitrogen removal as high as 91.6%. Enhanced competitiveness of anammox bacteria for substrate NO2--N was achieved with increasing utilization of the carbon source from domestic wastewater. Metagenomic analysis revealed that the electrons produced by NADH were more preferentially transported to the NO3--N reductase rather than the NO2--N reductase. Therefore, denitrifying bacteria Thauera as a main holder of Nar genes and anammox bacteria Candidatus Brocadia jointly removed NO3--N and NH4+-N. Sludge granulation with increasing domestic wastewater also facilitated the efficient retention of anammox bacteria. Overall, this study highlighted the efficient heterotrophic-autotrophic cooperation by in situ utilization of the complex carbon source from domestic wastewater, providing valuable technical support to advance the PD/A process toward practical application.

Keyword:

Partial denitrification Complex organiccarbon source Anammox Domestic wastewater Nitrate containing wastewater Metagenomic mechanisms

Author Community:

  • [ 1 ] [Du, Rui]Beijing Univ Technol, Engn Res Ctr Beijing, Natl Engn Lab Adv Municipal Wastewater Treatment &, Beijing 100124, Peoples R China
  • [ 2 ] [Liu, Qingtao]Beijing Univ Technol, Engn Res Ctr Beijing, Natl Engn Lab Adv Municipal Wastewater Treatment &, Beijing 100124, Peoples R China
  • [ 3 ] [Xu, Xinyi]Beijing Univ Technol, Engn Res Ctr Beijing, Natl Engn Lab Adv Municipal Wastewater Treatment &, Beijing 100124, Peoples R China
  • [ 4 ] [Cao, Shenbin]Beijing Univ Technol, Engn Res Ctr Beijing, Natl Engn Lab Adv Municipal Wastewater Treatment &, Beijing 100124, Peoples R China
  • [ 5 ] [Peng, Yongzhen]Beijing Univ Technol, Engn Res Ctr Beijing, Natl Engn Lab Adv Municipal Wastewater Treatment &, Beijing 100124, Peoples R China
  • [ 6 ] [Du, Rui]Karlsruhe Inst Technol, Engler Bunte Inst, Water Chem & Water Technol, D-76131 Karlsruhe, Germany
  • [ 7 ] [Horn, Harald]Karlsruhe Inst Technol, Engler Bunte Inst, Water Chem & Water Technol, D-76131 Karlsruhe, Germany

Reprint Author's Address:

  • [Cao, Shenbin]Beijing Univ Technol, Engn Res Ctr Beijing, Natl Engn Lab Adv Municipal Wastewater Treatment &, Beijing 100124, Peoples R China

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Source :

ACS SUSTAINABLE CHEMISTRY & ENGINEERING

ISSN: 2168-0485

Year: 2024

Issue: 2

Volume: 12

Page: 1007-1018

8 . 4 0 0

JCR@2022

Cited Count:

WoS CC Cited Count:

SCOPUS Cited Count: 9

ESI Highly Cited Papers on the List: 0 Unfold All

WanFang Cited Count:

Chinese Cited Count:

30 Days PV: 2

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