Improving Methane Yields of Semi-continuous Anaerobic Digestion of Deinking Sludge from Wastepaper Recycling

Purpose The purpose of the study was to investigate the role of trace elements (TEs) supplementation in connection with the organic load rate (OLR) and the hydraulic retention time (HRT) on methane (CH 4 ) yields in semi-continuous anaerobic digestion of deinking sludge (DS) in order to judge the po...

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Bibliographic Details
Published in:Waste and biomass valorization 2020-09, Vol.11 (9), p.4667-4676
Main Authors: Amare, Dagnachew Eyachew, Ogun, Moses Kolade, Körner, Ina
Format: Article
Language:English
Subjects:
Alternative energy sources
Anaerobic digestion
Bioreactors
Carbon/nitrogen ratio
Cobalt
Deinking
Engineering
Environment
Environmental Engineering/Biotechnology
Feeding
Hydraulic loading
Hydraulic retention time
Industrial Pollution Prevention
Load distribution
Methane
Molybdenum
Nickel
Optimization
Organic loading
Original Paper
Reactors
Recycling
Renewable and Green Energy
Retention time
Selenium
Sludge
Sludge digestion
Substrates
Trace elements
Waste Management/Waste Technology
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Summary:Purpose The purpose of the study was to investigate the role of trace elements (TEs) supplementation in connection with the organic load rate (OLR) and the hydraulic retention time (HRT) on methane (CH 4 ) yields in semi-continuous anaerobic digestion of deinking sludge (DS) in order to judge the possibility to use DS as alternative energy source in wastepaper recycling companies. Methods After substrate characterization, a semi-continuous anaerobic digestion was performed for 74 days using 2-L stirred tank reactors at a mesophilic (37 °C) condition, whereas one of them was supplemented with a mixture of TEs (cobalt, nickel, molybdenum and selenium). The feeding periods had a duration of 4, 7 or 8 days. Results The highest cumulative CH 4 yield after a feeding period was found to be 151 NmL/g oDM after TE supplementation. The TEs-supplementation has resulted in 42% increase in CH 4 yield compared to the non-supplemented variant. The increase took place at the end of the experiment. Earlier feeding periods with similar conditions regarding HRT and OLR, did not show an increase. This can be explained by the fact that TEs supplementation requires a longer adaption time for the microorganism. Conclusions TEs addition has shown a strongly positive impact on CH 4 yields. Our results showed that it is possible to receive the same yields in semi-continuous, more practice-close operation, compared to previous potential determination experiments under batch conditions. A further optimization potential is seen by optimizing TEs supplementation in connection with VOA level in the reactor, optimizing C/N ratio and lowering the duration of the feeding intervals. Graphic Abstract
ISSN:1877-2641
1877-265X
DOI:10.1007/s12649-019-00778-8