globalchange  > 气候变化事实与影响
DOI: 10.1016/j.watres.2019.01.029
Scopus ID: 2-s2.0-85061004287
Comparison of short-term dosing ferrous ion and nanoscale zero-valent iron for rapid recovery of anammox activity from dissolved oxygen inhibition
Author: Yan Y.; Wang Y.; Wang W.; Zhou S.; Wang J.; Guo J.
Source Publication: Water Research
ISSN: 431354
Publishing Year: 2019
pages begin: 284
pages end: 294
Language: 英语
Keyword: Activity recovery ; Anammox bacteria ; DO inhibition ; Ferrous ion ; Nanoscale zero-valent iron (nZVI) ; Reactive oxygen species (ROS)
Scopus Keyword: Bacteria ; Deterioration ; Dissolution ; Dissolved oxygen ; Ions ; Metal recovery ; Nanotechnology ; Nitrogen removal ; Wastewater treatment ; Activity recovery ; Anammox bacteria ; Ferrous ion ; Nanoscale zero-valent iron ; Reactive oxygen species ; Iron compounds ; dissolved oxygen ; ferrous ion ; iron nanoparticle ; polysaccharide ; reactive oxygen metabolite ; ammonia ; bacterium ; comparative study ; dissolved oxygen ; inhibition ; ion ; iron nanoparticle ; oxidation ; polysaccharide ; reactive oxygen species ; recovery ; water chemistry ; anaerobic ammonium oxidation ; anammox bacterium ; anammox sludge ; Article ; complex formation ; controlled study ; corrosion ; dissolution ; fungal biomass ; nonhuman ; pH ; precipitation ; priority journal
English Abstract: As obligate anaerobes, anammox bacteria are sensitive to oxygen, which might hinder the maximization of anammox activity. However, there are very few effective strategies to rapidly recover anammox activity after its deterioration under exposure of oxygen. In this study, the activity recovery of anammox bacteria encountering dissolved oxygen (DO) exposure (0.2 and 2.0 mg L −1 ) were compared by three strategies in short-term experiments, nZVI, Fe(II) dosing, and N 2 purging. nZVI is more effective in recovering anammox activity with a high DO exposure (2 mg L −1 ), compared to a low DO exposure (0.2 mg L −1 ). After inhibiting by 2.0 mg L −1 DO, anammox activity recovery (normalized to the control) was ranked in the order of nZVI (5 mg L −1 ) addition (63 ± 8.2%) > Fe(II) (5 mg L −1 ) addition (41 ± 8.0%) >N 2 purging (39 ± 4.0%). In contrast to Fe(II) ion additions, the shell structure of nZVI combined with the buffering effect of biomass-extracellular polysaccharide (EPS) prevented the sharp pH variation and excessive dissolved Fe(II)/Fe(III) in solution. Under such circumstances, nZVI addition (5 and 25 mg L −1 ) increased the intracellular reactive oxygen species (ROS) to a moderate level (<200%), which might be responsible for the better activity recovery of anammox than that of Fe(II) addition and N 2 purging. Specifically, 5 mg L −1 nZVI dosage moderately enhanced the intracellular O 2 − production (∼150% of the control) after scavenging 2.0 mg L −1 DO, and the anammox activity recovered better than that of both 5 and 25 mg L −1 Fe(II) ions additions. However, high dosage nZVI (75 mg L −1 ) inhibited anammox activity in spite of low or high DO exposure. Our findings elucidate that appropriate amount of nZVI (short-term dosing) can rapidly recover anammox activity when anammox bacteria encountering oxygen exposure accidentally and could be useful in facilitating the robust operation of anammox-based processes. © 2019 Elsevier Ltd
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Document Type: 期刊论文
Appears in Collections:气候变化事实与影响

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Affiliation: State Key Laboratory of Pollution Control and Resources Reuse, Shanghai Institute of Pollution Control and Ecological Security, College of Environmental Science and Engineering, Tongji University, Siping Road, Shanghai, 200092, China; Advanced Water Management Centre (AWMC), The University of Queensland, St. Lucia, QLD 4072, Australia

Recommended Citation:
Yan Y.,Wang Y.,Wang W.,et al. Comparison of short-term dosing ferrous ion and nanoscale zero-valent iron for rapid recovery of anammox activity from dissolved oxygen inhibition[J]. Water Research,2019-01-01
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