A model-based approach for evaluating the effects of sludge rheology on methane production during high solid anaerobic digestion: Focusing on mass transfer resistance

Liu, Jibao; Xu, Yufeng; Wei, Yuansong

doi:10.1016/j.bej.2023.109147

Cited by 3 publications

(1 citation statement)

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“…By increasing the concentration of Ca ion, the electrostatic repulsive force between small flocs can be reduced, thus increasing the size of the floc particles [65]. The increased size of the floc and granule sludge creates a greater distance between the enzyme and the water phase, making it more difficult for the substrate to be transferred [66]. Consequently, the rate of the enzymatic process within the floc appeared to be slow (0.086 nmol/min/gVSS, 1.69 U/mL).…”

Section: Assessment Of Potential Impacts On Microbial Aggregationmentioning

confidence: 99%

Methane Production Reduced by Lignin Derivatives in Pulping Wastewater: Inhibition of Free Hydrolase

Lei,

Xu,

Chen

et al. 2024

Fermentation

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The lignin derivatives generated during pulping might be responsible for the suboptimal performance of anaerobic reactors during the treatment of pulping wastewater. However, the exact mechanisms by which these derivatives exert influence remain unclear. This study investigated the influence of lignin derivatives, simulated using humic acids (HAs), in anaerobic granular sludge (AnGS). Compared to the enzymes present during floc-bonding and granule-bonding, the HAs impeded the conversion of unhydrolyzed substrates into methane and caused considerable inactivation of free enzymes. Simultaneously, the HAs suppressed agglomeration and weakened the strength of the AnGS. Furthermore, calcium ions helped maintain the integrity of the sludge structure. Therefore, the inhibition of extracellular enzymes using lignin derivatives delays the methanation of unhydrolyzed substrates, resulting in a reduced biomass within AnGS reactors owing to sludge disintegration and biomass loss. This study serves as a reference for investigating the persistent risks originating from lignin derivatives associated with using anaerobic granular-sludge bed reactors to treat pulping wastewater.

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Section: Assessment Of Potential Impacts On Microbial Aggregationmentioning

confidence: 99%