Feasibility of anaerobic co-digestion for biogas production from recycled paper industry sludge: optimization of mixing ratios and application in two-stage CSTR system design
3
Issued Date
2025-09-01
Resource Type
ISSN
02731223
Scopus ID
2-s2.0-105016275531
Pubmed ID
40952402
Journal Title
Water Science and Technology A Journal of the International Association on Water Pollution Research
Volume
92
Issue
5
Start Page
683
End Page
703
Rights Holder(s)
SCOPUS
Bibliographic Citation
Water Science and Technology A Journal of the International Association on Water Pollution Research Vol.92 No.5 (2025) , 683-703
Suggested Citation
Nammana B., Racho P., Nawong S., Wichitsathian B., Tantrakarnapa K. Feasibility of anaerobic co-digestion for biogas production from recycled paper industry sludge: optimization of mixing ratios and application in two-stage CSTR system design. Water Science and Technology A Journal of the International Association on Water Pollution Research Vol.92 No.5 (2025) , 683-703. 703. doi:10.2166/wst.2025.118 Retrieved from: https://repository.li.mahidol.ac.th/handle/123456789/112276
Title
Feasibility of anaerobic co-digestion for biogas production from recycled paper industry sludge: optimization of mixing ratios and application in two-stage CSTR system design
Corresponding Author(s)
Other Contributor(s)
Abstract
Anaerobic co-digestion (AnCoD) presents a promising route for valorizing sludge generated from recycled paper processing. This study explored the co-digestion of primary sludge (PS) and secondary sludge (SS) at various mixing ratios to enhance methane generation and system stability. Batch biochemical methane potential (BMP) assays revealed that the 1:3 PS:SS ratio produced the highest methane yield (918.66 mL CH4/g VS_fed) with a notably short lag phase of 1.59 days. Kinetic assessment using both modified Gompertz and logistic models indicated that the former offered superior fitting accuracy (R2 > 0.986), effectively describing methane production dynamics. A two-stage continuous stirred-tank reactor (CSTR) system operated under this optimal ratio showed distinct functional separation: the acidogenic stage facilitated hydrolysis and volatile fatty acid (VFA) degradation, while the methanogenic stage supported biogas generation with stable pH and low VFA/alkalinity ratios. Microbial analysis confirmed a clear differentiation between fermentative and methanogenic communities, with evidence suggesting enhanced electron transfer pathways. These findings underscore the potential of AnCoD for efficient sludge stabilization and bioenergy recovery in the pulp and paper sector.