The roles of free ammonia (FA) in biological wastewater treatment processes: A review

Liu, Yiwen; Ngo, Huu Hao; Guo, Wenshan; Peng, Lai; Wang, Dongbo; Ni, Bing‐Jie

doi:10.1016/j.envint.2018.11.039

Cited by 343 publications

(135 citation statements)

References 98 publications

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“…The protons absorbed by NH 3 molecules can also lead to alkalization of the cytosol. The inhibitory effect of N-FAN on the wastewater treatment process has been extensively described by Liu et al [18] In turn, these authors quotes two main mechanisms of N-FAN toxicity on bacteria: inhibitory and biocidal. In the first mechanism, N-FAN at the inhibitory level passively diffuses through the cell membrane causing H + imbalance and/or K + deficiency leading to cell activity inhibition.…”

Section: Introductionmentioning

confidence: 99%

Simultaneous Stripping of Ammonia from Leachate: Experimental Insights and Key Microbial Players

Jurczyk

Koc-Jurczyk

Masłoń

2020

Water

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Air stripping is commonly used to remove the ammonia in multistage treatment systems for municipal landfill leachate (LFL). This paper proposes a novel approach combining the process of stripping with biological removal of ammonia, based on simultaneous nitrification and denitrification (SND) in a single hybrid sequencing batch reactor (HSBR). To avoid the accumulation of free ammonia (N-FAN), the shallow aeration system was used for the treatment of raw LFL with N-TAN level of 1520 mg/L and pH 9.24. The mean N-FAN removal efficiency of 69% with the reaction rate of 55 mg L−1 h−1 and mean ammonium (N-NH4+) removal efficiency of 84% with the reaction rate of 44 mg L−1 h−1 were achieved within a month in such an HSBR (R1). The comparative HSBR (R2), with conventional aeration system maintaining the same concentration of dissolved oxygen (DO ≤ 1 mg/L), was removing only trace amounts of N-FAN and 48% of N-NH4+. The quantitative analysis of 16S rRNA genes indicated that the number of total bacteria, Actinobacteria, Bacteroidetes, Firmicutes, and Beta- and Gammaproteobacteria increased during the operation of both HSBRs, but was always higher in R1. Moreover, the bacterial community shift was observed since the beginning of the experiment; the relative abundance of Firmicutes, and Beta- and Gammaproteobacteria increased by 5.01, 3.25 and 9.67% respectively, whilst the abundance of Bacteroidetes and Actinobacteria decreased by 15.59 and 0.95%. All of the surveyed bacteria groups, except Gammaproteobacteria, correlated significantly negatively (p < 0.001) with the concentrations of N-NH4+ in the outflows from R1. The results allow us to suppose that simultaneous stripping and SND in a single reactor could be a promising, cost-effective and easy-to-operate solution for LFL treatment.

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Section: Introductionmentioning

confidence: 99%

Simultaneous Stripping of Ammonia from Leachate: Experimental Insights and Key Microbial Players

Jurczyk

Koc-Jurczyk

Masłoń

2020

Water

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“…As evident in Table 1, the actual influent COD, BOD 5 , SS, TP, and TN concentrations during the sampling period were 2–3 times higher than the design influent concentrations in the WWTP. The transformation of influent TN may generate substantial levels of free ammonia and free nitrous acid, which can have adverse impacts on microbial community 33,34 . The effluent from the WWTP met the second-level discharge standard 35 .…”

Section: Resultsmentioning

confidence: 99%

The microbial community in filamentous bulking sludge with the ultra-low sludge loading and long sludge retention time in oxidation ditch

Zhang

Yao

Wang

et al. 2019

Sci Rep

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Sludge bulking is a major problem that restricts the development of the activated sludge process. The microbial community responsible for sludge bulking varies depending on water quality and operational conditions. This study analysed the microbial community of bulking sludge in oxidation ditch with ultra-low sludge loading and long sludge retention time using high-throughput sequencing. The study found that the relative abundance of bacterial genus Saprospiraceae_norank was the highest in bulking sludge, reaching 13.39–28.83%, followed by Comamonadaceae_unclassified, Ardenticatenia_norank and Tetrasphaera, with the relative abundance of 4.59–11.08%, 0.52–16.60% and 0.17–8.92% respectively. In contrast, the relative abundance of bacteria that easily caused sludge bulking including Microthrix (0.54–2.47%), Trichococcus (0.32–1.71%), Gordonia (0.14–1.28%), and Thiothrix (0.01–0.06%) were relatively low. Saprospiraceae_norank was predominant and induced sludge bulking in oxidation ditch. The relative abundance of fungal genus Trichosporon was the highest in bulking sludge, reaching 16.95–24.98%, while other fungal genera were Saccharomycetales_unclassified (5.59–14.55%), Ascomycota_norank (1.45–13.51%), Galactomyces (5.23–11.23%), and Debaryomyces (7.69–9.42%), whereas Trichosporon was the dominant fungal genus in bulking sludge. This study reported that excessive Saprospiraceae_norank can induce sludge bulking for the first time, which provides important knowledge to control sludge bulking.

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“…Isaka et al 32 also mentioned that a high concentration of ammonia (NH 4 + , 690 mg L À1 ) shows no signicant inhibition of the anammox process during the process of ammonia plant wastewater treatment. However, with deep research into anammox and partial denitrication coupling, [33][34][35] it was found that the above situation is likely caused by the fact that the content of FA (free ammonia, NH 3 ) in the sewage is less than the requirement of the inhibition value; therefore, the inhibitory effect on the anammox process is FA instead of NH 4 + .…”

Section: Engineering Applicationmentioning

confidence: 99%

Anammox and partial denitrification coupling: a review

You

Wang

et al. 2020

RSC Adv.

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The roles of free ammonia (FA) in biological wastewater treatment processes: A review

Cited by 343 publications

References 98 publications

Simultaneous Stripping of Ammonia from Leachate: Experimental Insights and Key Microbial Players

Simultaneous Stripping of Ammonia from Leachate: Experimental Insights and Key Microbial Players

The microbial community in filamentous bulking sludge with the ultra-low sludge loading and long sludge retention time in oxidation ditch

Anammox and partial denitrification coupling: a review

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