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Autotrophic Sulfur-Driven Partial Denitrification as a Sustainable Nitrite Supply Pathway for Anammox: Insights on Enhanced Nitrogen Removal and Microbial Synergies
https://orcid.org/0009-0003-7338-8026
Anaerobic ammonia oxidation (Anammox) has garnered growing attention as an energy-efficient bioprocess. However, the sustainable provision of nitrite remains a crucial challenge. This study aimed to assess a promising alternative to existing partial nitrification- and heterotrophic partial denitrification (PDN)-based Anammox processes by substituting the nitrite supply with autotrophic sulfur-driven PDN. After 200 days, the desirable nitrogen removal efficiency of 96.1% was obtained in the S-PDN coupling Anammox process (S-PDN/A) with a high-quality effluent total nitrogen of 3.1 mg N/L. Additional experiments identified S-PDN/A as a stepwise reaction with generated S0 as an intermediate. Initially, S2– was oxidized to S0 [21.2 mg of S/(g of SS·h)], coupled with ultrafast denitrification [NO3 – → N2, 3.9 mg of N/(g of SS·h)]. Subsequently, S0 served as an electron donor for S-PDN (NO3 – → NO2 –), efficiently facilitating Anammox as the dominant nitrogen removal pathway contributing up to 71.0% with a reaction rate of 1.7 mg N/(g SS·h). Distinct from reported prevalence of Candidatus brocadia in the Anammox technology for low-strength wastewater treatment, Candidatus kuenenia (0.12% → 3.4%) unexpectedly triumphed due to unique ecological niche provided by S-PDN. S-PDN/A offers fresh insights into Anammox application, enabling a potential reduction of up to 100% in organics demand, 43.0% savings in aeration energy consumption, and 69.9% decrease in biomass generation when compared to conventional bioprocesses.
This study explored the synergistic mechanism of sulfur-oxidizing bacteria and Anammox, offering insights for concurrent treatment of municipal and sulfur-containing wastewater.
Autotrophic Sulfur-Driven Partial Denitrification as a Sustainable Nitrite Supply Pathway for Anammox: Insights on Enhanced Nitrogen Removal and Microbial Synergies
https://orcid.org/0009-0003-7338-8026
Anaerobic ammonia oxidation (Anammox) has garnered growing attention as an energy-efficient bioprocess. However, the sustainable provision of nitrite remains a crucial challenge. This study aimed to assess a promising alternative to existing partial nitrification- and heterotrophic partial denitrification (PDN)-based Anammox processes by substituting the nitrite supply with autotrophic sulfur-driven PDN. After 200 days, the desirable nitrogen removal efficiency of 96.1% was obtained in the S-PDN coupling Anammox process (S-PDN/A) with a high-quality effluent total nitrogen of 3.1 mg N/L. Additional experiments identified S-PDN/A as a stepwise reaction with generated S0 as an intermediate. Initially, S2– was oxidized to S0 [21.2 mg of S/(g of SS·h)], coupled with ultrafast denitrification [NO3 – → N2, 3.9 mg of N/(g of SS·h)]. Subsequently, S0 served as an electron donor for S-PDN (NO3 – → NO2 –), efficiently facilitating Anammox as the dominant nitrogen removal pathway contributing up to 71.0% with a reaction rate of 1.7 mg N/(g SS·h). Distinct from reported prevalence of Candidatus brocadia in the Anammox technology for low-strength wastewater treatment, Candidatus kuenenia (0.12% → 3.4%) unexpectedly triumphed due to unique ecological niche provided by S-PDN. S-PDN/A offers fresh insights into Anammox application, enabling a potential reduction of up to 100% in organics demand, 43.0% savings in aeration energy consumption, and 69.9% decrease in biomass generation when compared to conventional bioprocesses.
This study explored the synergistic mechanism of sulfur-oxidizing bacteria and Anammox, offering insights for concurrent treatment of municipal and sulfur-containing wastewater.
Autotrophic Sulfur-Driven Partial Denitrification as a Sustainable Nitrite Supply Pathway for Anammox: Insights on Enhanced Nitrogen Removal and Microbial Synergies
https://orcid.org/0009-0003-7338-8026
Anaerobic ammonia oxidation (Anammox) has garnered growing attention as an energy-efficient bioprocess. However, the sustainable provision of nitrite remains a crucial challenge. This study aimed to assess a promising alternative to existing partial nitrification- and heterotrophic partial denitrification (PDN)-based Anammox processes by substituting the nitrite supply with autotrophic sulfur-driven PDN. After 200 days, the desirable nitrogen removal efficiency of 96.1% was obtained in the S-PDN coupling Anammox process (S-PDN/A) with a high-quality effluent total nitrogen of 3.1 mg N/L. Additional experiments identified S-PDN/A as a stepwise reaction with generated S0 as an intermediate. Initially, S2– was oxidized to S0 [21.2 mg of S/(g of SS·h)], coupled with ultrafast denitrification [NO3 – → N2, 3.9 mg of N/(g of SS·h)]. Subsequently, S0 served as an electron donor for S-PDN (NO3 – → NO2 –), efficiently facilitating Anammox as the dominant nitrogen removal pathway contributing up to 71.0% with a reaction rate of 1.7 mg N/(g SS·h). Distinct from reported prevalence of Candidatus brocadia in the Anammox technology for low-strength wastewater treatment, Candidatus kuenenia (0.12% → 3.4%) unexpectedly triumphed due to unique ecological niche provided by S-PDN. S-PDN/A offers fresh insights into Anammox application, enabling a potential reduction of up to 100% in organics demand, 43.0% savings in aeration energy consumption, and 69.9% decrease in biomass generation when compared to conventional bioprocesses.
This study explored the synergistic mechanism of sulfur-oxidizing bacteria and Anammox, offering insights for concurrent treatment of municipal and sulfur-containing wastewater.
Autotrophic Sulfur-Driven Partial Denitrification as a Sustainable Nitrite Supply Pathway for Anammox: Insights on Enhanced Nitrogen Removal and Microbial Synergies
Du, Ziyi (author) / Wang, Jiahui (author) / Zhang, Fangzhai (author) / Peng, Yongzhen (author)
ACS ES&T Water ; 4 ; 4604-4614
2024-10-11
Article (Journal)
Electronic Resource
English
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