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Research Article
Luan Vieira Adames
UNESP IQAR: Universidade Estadual Paulista Julio de Mesquita Filho Instituto de Quimica
Corresponding Author
ORCiD: https://orcid.org/0000-0002-3912-687X
License:
This work is licensed under a CC BY 4.0 License. Read Full License
The anaerobic conversion of residual glycerol from biodiesel production is an excellent option for producing clean energy at a low cost. Crude glycerol (CG) is an excellent carbon source for microorganisms in Anaerobic Digestion (AD) process; however, it is a nutrient-limited waste. On the other hand, domestic Sewage (DS) is wastewater containing macronutrients, such as nitrogen and phosphorus. Therefore, feeding bioreactors with a blend of both wastes is an exciting approach. The objective of this study was to operate a system consisting of three horizontal anaerobic series reactors (HARFB) with fixed bed (R1, R2, and R3), fed with a mixture of crude glycerol and domestic sewage to evaluate the start-up strategy and best organic loading rate (OLR) to improve biogas production (H2 e CH4) as well as to analyze the dynamic changes in the anaerobic microbial consortium during the operation of the HARFB. The highest hydrogen generation was 10.3 moles H2 (m3 d-1) in reactor R1, and the highest methane yield was 312.0 and 283.9 L CH4 (m3 d-1) in R2 and R3, respectively. The three-stage system showed high efficiency in removing crude glycerol and Chemical Oxygen Demand (COD), with consumptions of 99.9%. In addition, there was a change in the relative abundance of microorganisms amongst R1, R2, and R3 and a considerable decrease in the diversity index in the fermentation reactor (R1). The results have shown the potential of applying HARFB reactors for energy recovery and alternative waste disposal.
Keywords
Biodiesel, domestic sewage, bioenergy, co-digestion, PCR-DGGE.
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Posted 16 Nov, 2021
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Received 24 Nov, 2021
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This preprint is under consideration at BioEnergy Research. A preprint is a preliminary version of a manuscript that has not completed peer review at a journal. Research Square does not conduct peer review prior to posting preprints. The posting of a preprint on this server should not be interpreted as an endorsement of its validity or suitability for dissemination as established information or for guiding clinical practice.
Learn more about In Review
Research Article
Luan Vieira Adames
UNESP IQAR: Universidade Estadual Paulista Julio de Mesquita Filho Instituto de Quimica
Corresponding Author
ORCiD: https://orcid.org/0000-0002-3912-687X
Badges
Prescreen
This manuscript passed our Prescreen assessment
Complete author information
Appropriate declaration statements
Potential risks to human health
Prescreen
Peer Review Timeline
CURRENT STATUS: Under Review
Version 1
Posted 16 Nov, 2021
No community comments so far
Reviews received
Received 24 Nov, 2021
Reviewers invited
Invitations sent on 12 Nov, 2021
Editor assigned
On 10 Nov, 2021
First submitted
On 04 Nov, 2021
Metrics
Comments: 0
PDF Downloads: ...
HTML Views: ...
License:
This work is licensed under a CC BY 4.0 License. Read Full License
The anaerobic conversion of residual glycerol from biodiesel production is an excellent option for producing clean energy at a low cost. Crude glycerol (CG) is an excellent carbon source for microorganisms in Anaerobic Digestion (AD) process; however, it is a nutrient-limited waste. On the other hand, domestic Sewage (DS) is wastewater containing macronutrients, such as nitrogen and phosphorus. Therefore, feeding bioreactors with a blend of both wastes is an exciting approach. The objective of this study was to operate a system consisting of three horizontal anaerobic series reactors (HARFB) with fixed bed (R1, R2, and R3), fed with a mixture of crude glycerol and domestic sewage to evaluate the start-up strategy and best organic loading rate (OLR) to improve biogas production (H2 e CH4) as well as to analyze the dynamic changes in the anaerobic microbial consortium during the operation of the HARFB. The highest hydrogen generation was 10.3 moles H2 (m3 d-1) in reactor R1, and the highest methane yield was 312.0 and 283.9 L CH4 (m3 d-1) in R2 and R3, respectively. The three-stage system showed high efficiency in removing crude glycerol and Chemical Oxygen Demand (COD), with consumptions of 99.9%. In addition, there was a change in the relative abundance of microorganisms amongst R1, R2, and R3 and a considerable decrease in the diversity index in the fermentation reactor (R1). The results have shown the potential of applying HARFB reactors for energy recovery and alternative waste disposal.
Figure 1
Figure 2
Figure 3
Figure 4
Figure 5
Figure 6
Figure 7
Figure 8
Figure 9
Figure 10
This is a list of supplementary files associated with this preprint. Click to download.
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