Influence of mixing on anaerobic digestion efficiency in stirred tank digesters: A review

A comprehensive review was carried out on the influence of mixing on anaerobic digestion (AD) efficiency in stirred tank anaerobic digesters. Though traditionally, stirred tank digesters operated as continuous stirred tank reactors (CSTRs), this review revealed that there is no motivation to continu...

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Bibliographic Details
Published in:Water research (Oxford) 2018-10, Vol.143, p.503-517
Main Authors: Kariyama, Ibrahim Denka, Zhai, Xiaodong, Wu, Binxin
Format: Article
Language:English
Subjects:
Anaerobic digestion efficiency
Anaerobiosis
Biofuels
Bioreactors
CSTRs
Methane - metabolism
Microbial Consortia
Optimized intermittent mixing
Waste Disposal, Fluid - instrumentation
Waste Disposal, Fluid - methods
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Summary:A comprehensive review was carried out on the influence of mixing on anaerobic digestion (AD) efficiency in stirred tank anaerobic digesters. Though traditionally, stirred tank digesters operated as continuous stirred tank reactors (CSTRs), this review revealed that there is no motivation to continue to operate stirred tank anaerobic digesters as CSTRs if AD energy efficiency is to be improved. AD energy production efficiency can be achieved with optimized intermittent mixing. AD efficiency should include an assessment of the net energy production efficiency and should be the criteria in determining the mixing mode, mixing intensity, mixing time and mixing interval for every anaerobic digestion operating plan. •Continuous mixing is a waste of energy and does not improve AD efficiency.•Optimized intermittent mixing improves AD efficiency.•Intermittent minimally mixed is enough for batch-fed AD CH4 production.•High intensity mixing should be avoided.•Mixing evaluation on AD should include assessment of the net energy efficiency.
ISSN:0043-1354
1879-2448
DOI:10.1016/j.watres.2018.06.065