TY - JOUR
T1 - Recovery of Nitrous Oxide from Wastewater Treatment
T2 - Current Status and Perspectives
AU - Duan, Haoran
AU - Zhao, Yingfen
AU - Koch, Konrad
AU - Wells, George F.
AU - Weißbach, Max
AU - Yuan, Zhiguo
AU - Ye, Liu
PY - 2021/2/12
Y1 - 2021/2/12
N2 - Nitrous oxide (N2O) has been studied intensively in wastewater treatment as a detrimental greenhouse gas. However, increasingly more studies have adopted a contrasting objective, recovering N2O from wastewater as an energy resource. This article critically reviewed and analyzed the current status of N2O recovery research in wastewater treatment, to identify knowledge gaps and guide future research. Overall, N2O recovery is a promising research direction while still in active development. At present, unstable nitritation, the low energy potential, and potential environmental risks of N2O harvesting render the recovery of N2O from mainstream wastewater technically and economically challenging. High-strength wastewater treatment is more favorable for N2O recovery due to the high energy potential, established nitritation approaches, and significant carbon/aeration savings. The coupled aerobic-anoxic nitrous decomposition operation (CANDO) process is currently the most investigated and promising N2O recovery process. Nevertheless, more research is needed for its implementation on a large scale. Research opportunities for the CANDO process have been identified in this paper. Meanwhile, N2O recovery via autotrophic denitritation is a more recent concept, with limited studies hitherto. More experiments are needed to investigate its technological feasibility. Furthermore, other novel N2O recovery processes, e.g., truncated denitrification and chemical oxidation, should also be explored to facilitate the recovery of N2O from wastewater. © 2020 American Chemical Society.
AB - Nitrous oxide (N2O) has been studied intensively in wastewater treatment as a detrimental greenhouse gas. However, increasingly more studies have adopted a contrasting objective, recovering N2O from wastewater as an energy resource. This article critically reviewed and analyzed the current status of N2O recovery research in wastewater treatment, to identify knowledge gaps and guide future research. Overall, N2O recovery is a promising research direction while still in active development. At present, unstable nitritation, the low energy potential, and potential environmental risks of N2O harvesting render the recovery of N2O from mainstream wastewater technically and economically challenging. High-strength wastewater treatment is more favorable for N2O recovery due to the high energy potential, established nitritation approaches, and significant carbon/aeration savings. The coupled aerobic-anoxic nitrous decomposition operation (CANDO) process is currently the most investigated and promising N2O recovery process. Nevertheless, more research is needed for its implementation on a large scale. Research opportunities for the CANDO process have been identified in this paper. Meanwhile, N2O recovery via autotrophic denitritation is a more recent concept, with limited studies hitherto. More experiments are needed to investigate its technological feasibility. Furthermore, other novel N2O recovery processes, e.g., truncated denitrification and chemical oxidation, should also be explored to facilitate the recovery of N2O from wastewater. © 2020 American Chemical Society.
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U2 - 10.1021/ACSESTWATER.0C00140
DO - 10.1021/ACSESTWATER.0C00140
M3 - RGC 21 - Publication in refereed journal
SN - 2690-0637
VL - 1
SP - 240
EP - 250
JO - ACS ES&T Water
JF - ACS ES&T Water
IS - 2
ER -
