Once-through CO2 absorption for simultaneous biogas upgrading and fertilizer production

He, Qingyao, Yu, Ge, Wang, Wenchao, Yan, Shuiping, Zhang, Yanlin and Zhao, Shuaifei 2017, Once-through CO2 absorption for simultaneous biogas upgrading and fertilizer production, Fuel Processing Technology, vol. 166, pp. 50-58, doi: 10.1016/j.fuproc.2017.05.027.

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Title Once-through CO2 absorption for simultaneous biogas upgrading and fertilizer production
Formatted title Once-through CO₂ absorption for simultaneous biogas upgrading and fertilizer production
Author(s) He, Qingyao
Yu, Ge
Wang, Wenchao
Yan, Shuiping
Zhang, Yanlin
Zhao, ShuaifeiORCID iD for Zhao, Shuaifei orcid.org/0000-0002-7727-6676
Journal name Fuel Processing Technology
Volume number 166
Start page 50
End page 58
Total pages 9
Publisher Elsevier
Place of publication Amsterdam, The Netherlands
Publication date 2017-11
ISSN 0378-3820
Keyword(s) Carbon capture
Biogas upgrading
Renewable absorbent
Vacuum membrane distillation
Biogas slurry
CO2 absorption
Science & Technology
Physical Sciences
Chemistry, Applied
Energy & Fuels
Engineering, Chemical
Summary © 2017 Elsevier B.V. A new process is developed for biogas upgrading using the total ammonia nitrogen (TAN) in biogas slurry as a renewable absorbent. TAN in biogas slurry can be transferred into free ammonia by adding NaOH to increase the solution pH. Increasing the pH of biogas slurry to 10 causes that > 90% TAN transfers into free ammonia, leading to high TAN removal ratios. However, further increasing the pH of biogas slurry has limited effects. Vacuum membrane distillation (VMD) has higher kinetics constants and thus is a more effective way to recover and enrich ammonia from biogas slurry compared with thermal or air stripping. After VMD, the recovered aqueous ammonia solution with high TAN concentrations and the enhanced biogas slurry can be used as “once-through” CO2 absorbents. With alkaline addition, VMD does not increase the CO2 absorption capacity, but significantly minimizes the phytotoxicity of biogas slurry. When NaOH dosage is below 0.25 M, superior ammonia separation performance with high kinetics constants and low phytotoxicity can be achieved. The recovered aqueous ammonia solution also has excellent CO2 absorption performance for biogas upgrading and can help obtain high content of methane. This study provides an effective process for biogas upgrading with low costs and generation of valuable products, including high purity bio-methane, low phytotoxicity biogas slurry for agricultural application and high concentration NH4HCO3 as a fertilizer.
Language eng
DOI 10.1016/j.fuproc.2017.05.027
Indigenous content off
Field of Research 0904 Chemical Engineering
0306 Physical Chemistry (incl. Structural)
HERDC Research category C1 Refereed article in a scholarly journal
Persistent URL http://hdl.handle.net/10536/DRO/DU:30129297

Document type: Journal Article
Collections: Institute for Frontier Materials
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