Feasibility of in-situ sludge fermentation coupled with partial denitrification: Key roles of initial organic matters and alkaline pH

Wang, Lu; Hao, Xiang; Jiang, Tan; Li, Xiaodi; Yang, Jiayi; Wang, Bo

doi:10.1016/j.biortech.2024.130730

Cited by 3 publications

(1 citation statement)

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“…When 0.2 g/g of CaO 2 -pretreated sludge acid was added as an external denitrification carbon source at 70 • C, the total nitrogen removal rate of wastewater increased by 57.3%. Liu et al established a full-scale process for anaerobic alkaline fermentation of sewage sludge to produce VFAs [126], and they found that the fermentation broth with VFAs showed similar effects to acetic acid in phosphorus and nitrogen removal, with nitrogen and phosphorus removal rates reaching 72.39% and 89.65%, respectively.…”

Section: Contribution Of Sludge Fermentation To Nitrogen Removalmentioning

confidence: 99%

Harnessing the Potential of Sludge Fermentation Liquid to Induce Partial Nitrification

Wang,

Jiang,

Wang

et al. 2024

Fermentation

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Extra energy consumption, inefficient nitrogen removal, and excessive sludge production are major challenges faced by wastewater treatment plants (WWTPs) that rely on the traditional activated sludge process. Fermentation of wasted activated sludge (WAS) and novel nitrogen removal technologies based on partial nitrification (PN) have emerged as promising solutions to these issues. Recent studies have revealed an innovative strategy that integrates these two processes by supplementing fermentation liquid into activated sludge to induce PN. This review summarizes the research progress on PN establishment induced by the fermentation process. The microbiology and establishment methods of PN are briefly introduced, followed by a detailed discussion on the process, influencing factors, and product characteristics of WAS fermentation. The core section focuses on the side-stream and main-stream approaches of fermentation-induced PN, comparing their performance and application prospects. The potential mechanisms are explored, with an emphasis on the roles of free ammonia for the side-stream approach and the high tolerance of ammonium oxidizers to in-site fermentation stress for the main-stream approach. Finally, the limitations of the current research and future perspectives are discussed, highlighting the need for further investigation into microbial ecology, process optimization, and long-term stability. This review aims to provide insights into the synergistic integration of WAS fermentation and PN for sustainable and energy-efficient wastewater treatment.

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Section: Contribution Of Sludge Fermentation To Nitrogen Removalmentioning

confidence: 99%