Development of a new combination of spectroscopic analysis and mathematical model for the enhanced sludge dewaterability: Application to tannic acid effect

Guo, Jun; An, Dong; Hu, Yue; Qian, Yunkun; Ma, Jiaxin; Shi, Yijun; Song, Jiaxiu; Liu, Chao

doi:10.1016/j.cej.2024.148833

Cited by 3 publications

(2 citation statements)

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“…The ratio of α-helix/(β-sheet + random coil), which represented the looseness of protein structures, was 28% in the control while it increased to 46% in TA-treated reactor. Previous studies have confirmed that a lower ratio of α-helix/(β-sheet + random coil) is typically associated with looser protein structures . These results indicated that TA altered the secondary structure of soluble proteins in fermentation solutions, which resulted in the increase of flocculation properties with reduced bioavailability of soluble proteins.…”

Section: Resultsmentioning

confidence: 65%

“…Previous studies have confirmed that a lower ratio of α-helix/(β-sheet + random coil) is typically associated with looser protein structures. 36 These results indicated that TA altered the secondary structure of soluble proteins in fermentation solutions, which resulted in the increase of flocculation properties with reduced bioavailability of soluble proteins.…”

Section: ■ Results and Discussionmentioning

confidence: 89%

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Tannic Acid Modulation of Substrate Utilization, Microbial Community, and Metabolic Traits in Sludge Anaerobic Fermentation for Volatile Fatty Acid Promotion

Huang,

Wang,

Xia

et al. 2024

Environ. Sci. Technol.

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Anaerobic fermentation is a crucial route to realize effective waste activated sludge (WAS) resource recovery and utilization, while the overall efficiency is commonly restrained by undesirable disruptors (i.e., chemical dewatering agents). This work unveiled the unexpectedly positive effects of biodewatering tannic acid (TA) on the volatile fatty acids (VFAs) biosynthesis during WAS anaerobic fermentation. The total VFAs yield was remarkably increased by 15.6 folds with enriched acetate and butyrate in TA-occurred systems. TA was capable to disintegrate extracellular polymeric substances to promote the overall organics release. However, TA further modulated the soluble proteins structure by hydrogen bonding and hydrophobic interactions, resulting in the decrease of proteins bioavailability and consequential alteration of metabolic substrate feature. These changes reshaped the microbial community and stimulated adaptive regulatory systems in hydrolytic–acidogenic bacteria. The keystone species for carbohydrate metabolism (i.e., Solobacterium and Erysipelotrichaceae) were preferentially enriched. Also, the typical quorum sensing (i.e., enhancing substrate transport) and two-component systems (i.e., sustaining high metabolic activity) were activated to promote the microbial networks connectivity and ecological cooperative behaviors in response to TA stress. Additionally, the metabolic functions responsible for carbohydrate hydrolysis, transmembrane transport, and intracellular metabolism as well as VFA biosynthesis showed increased relative abundance, which maintained high microbial activities for VFAs biosynthesis. This study underscored the advantages of biodewatering TA for WAS treatment in the context of resource recovery and deciphered the interactive mechanisms.

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Section: Resultsmentioning

confidence: 65%

Section: ■ Results and Discussionmentioning

confidence: 89%