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A critical review of ammonia recovery from anaerobic digestate of organic wastes via stripping

Journal Contribution - Journal Article

Anaerobic digestion is a well-established technology which valorises organic wastes to produce renewable energy as biogas. The ammonia released during this process can be inhibitory if it exceeds the threshold concentration. Additionally, ammonia is a harmful environmental pollutant and also a renewable source of energy, thus establishing a need for the recovery of ammonia. Gas-liquid stripping is one such widely researched technology to recover ammonia from wastewaters. However, there have not been any reviews focusing solely on the application of stripping to recover ammonia from the anaerobic digestate of organic wastes. This study reviews the current state of research in this field, focusing on the factors affecting the ammonia recovery, stripping column designs and linking of an anaerobic digester to a stripping column. An overview of the work done on the modelling of the ammonia stripping from digestate is also included. This review offers a direction for further research in this field; namely experimental and modelling studies on i) the effect of digestate composition on ammonia recovery and ii) the effect of stripping gas on ammonia removal.
Journal: Renewable & Sustainable Energy Reviews
ISSN: 1364-0321
Volume: 143
Publication year:2021
BOF-keylabel:yes
IOF-keylabel:yes
BOF-publication weight:6
CSS-citation score:2
Authors:International
Authors from:Higher Education
Accessibility:Open