Achieving nitritation by treating sludge with free nitrous acid: The effect of starvation

Nan, Xi; Ma, Bin; Qian, Wenting; Zhu, Hongbo; Li, Xiyao; Zhang, Qiong; Peng, Yongzhen

doi:10.1016/j.biortech.2018.09.113

Cited by 17 publications

(4 citation statements)

References 25 publications

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“…It should also be noted that the starvation of activated sludge could facilitate the NOB resistance to FNA treatment. Both pre-starvation and post-starvation were shown, in batch tests, to deteriorate the effectiveness of selective NOB suppression by FNA treatment(Nan et al 2019).…”

mentioning

confidence: 96%

Improving wastewater management using free nitrous acid (FNA)

et al. 2020

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mentioning

confidence: 96%

Improving wastewater management using free nitrous acid (FNA)

et al. 2020

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“…By using this method, a stable PN trait was successfully established with a maximum NAR of over 90% and displayed considerable resistance to high dissolved oxygen levels and low temperature stress [32]. Subsequently, multiple research teams worldwide successfully established PN in different reactors using the principle of FNA selective inhibition of NOB activity [72,73]. For the first time, Jiang et al achieved PN using the FNA method in an A 2 O reactor, which officially promotes FNA-induced PN for continuous flow treatment processes with higher market share [33].…”

Section: Free Ammonia (Fa)mentioning

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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“…Once TOC removal was re-established, the AOR rose exponentially and stabilized at 60 % after 6 days (day 225) without nitrate production (Figure 1.A and B). Nan, et al [26] observed, from batch tests, that starvation periods (of 5 days before or 12 hours after the FNA sludge treatment) enhanced the resistance of NOB to FNA. However, the starvation period before Stage III did not seem to affect the NOB suppression in the present study negatively.…”

Section: Recovery Of Oxidation Processes After Anoxic Starvationmentioning

confidence: 99%