Exploring the feasibility and potential mechanism of synergistic enhancement of sludge dewaterability by ultrasonic cracking, chitosan re-flocculation and sludge-based biochar adsorption of water-holding substances

Yang, Yahong; Yang, Xingfeng; Yang, Qi; Zhang, Huining; Xu, Weixin; Zhu, Lixin; Ma, Pengjin; Li, Yangying

doi:10.1016/j.jece.2022.108303

Cited by 21 publications

(1 citation statement)

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“…The traditional PAC and PAM are supposed to flocculate the WAS mainly by charge neutralization and/or bridging effects to restrain the release of organic contents for subsequent microbial utilization . Interestingly, the biodewatering agents are implied to interact with the organic components and alter the physical–chemical characteristics of EPS to improve WAS dewatering performance. , For instance, the TA mainly reacted with organic substances in EPS to alter the hydrophobicity of WAS surface . Whether the “specific” interactive mechanism of biodewatering agents would exhibit distinct impacts on the WAS solubilization and hydrolysis for fermentation substrate release (in comparison with chemical PAC) determines the anaerobic fermentation efficiency for VFA generation.…”

Section: Introductionmentioning

confidence: 99%

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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