DOI: 10.1016/j.watres.2018.06.021
Scopus记录号: 2-s2.0-85049346015
论文题名: Characterising and modelling free ammonia and ammonium inhibition in anaerobic systems
作者: Astals S. ; Peces M. ; Batstone D.J. ; Jensen P.D. ; Tait S.
刊名: Water Research
ISSN: 431354
出版年: 2018
卷: 143 起始页码: 127
结束页码: 135
语种: 英语
英文关键词: Ammonia
; Anaerobic digestion
; Inhibition
; Modelling
; Nitrogen
; Toxicity
Scopus关键词: Ammonia
; Chlorine compounds
; Enzyme inhibition
; Models
; Nitrogen
; Salts
; Toxicity
; Ammoniacal nitrogen
; Anaerobic digester
; Anaerobic systems
; Competitive inhibition
; Inhibition concentrations
; PH adjustment
; Test condition
; Total ammoniacal nitrogen
; Anaerobic digestion
; ammonia
; ammonium bicarbonate
; ammonium chloride
; ammonium derivative
; nitrogen
; sodium chloride
; unclassified drug
; ammonia
; anaerobic digestion
; anoxic conditions
; concentration (composition)
; inhibition
; nitrogen
; numerical model
; performance assessment
; threshold
; toxicity
; anaerobic digestion
; Article
; competitive inhibition
; concentration (parameters)
; controlled study
; inhibition kinetics
; inhibitory concentration
; inoculation
; molecular model
; pH
; priority journal
; sludge
; uncertainty
英文摘要: Inhibition by ammoniacal nitrogen, consisting of free ammonia (NH3) and ammonium ion (NH4 +), has been widely investigated for anaerobic digestion. However, despite the large amount of research on the subject, ammoniacal nitrogen inhibition still threatens many anaerobic digesters. This paper presents (i) a method to reliably characterise ammoniacal nitrogen inhibition and (ii) a robust inhibition modelling approach. Results showed that NH3 and NH4 + inhibition need to be jointly determined, which can only be done by performing inhibition tests at various total ammoniacal nitrogen (TAN) concentrations and pH values. These test conditions were reliably achieved using the salts NH4HCO3 and NH4Cl without pH adjustment, rather than by using NH4Cl with pH adjustment. The use of only salts showed a lower pH change during the inhibition test (∼1.5 days), thereby decreasing the uncertainty in TAN speciation and strengthening the test and model outputs. A threshold inhibition function satisfactorily described (R2 > 0.99) the joint inhibition of NH3 and NH4 + on three distinct inocula, and provided a better description of the inhibition testing results than a non-competitive inhibition function (R2 ∼0.70). The key advantage of the proposed threshold inhibition function is its capacity to identify the inhibition lower limit (concentration where inhibition starts; KImin) and upper limit (concentration where inhibition is complete; KImax). The threshold inhibition function also identifies the 50% inhibition concentration (KI50) at the midpoint of KImin and KImax. Finally, experimental and model results show that at pH 7.3–7.7 and TAN concentrations above 2000 mgN·L−1, both NH3 and NH4 + contribute significantly to overall inhibition. © 2018 Elsevier Ltd Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/112579
Appears in Collections: 气候减缓与适应
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作者单位: Advanced Water Management Centre, The University of Queensland, Brisbane, QLD 4072, Australia; Centre for Solid Waste Bioprocessing, Schools of Civil and Chemical Engineering, The University of QueenslandQLD 4072, Australia
Recommended Citation:
Astals S.,Peces M.,Batstone D.J.,et al. Characterising and modelling free ammonia and ammonium inhibition in anaerobic systems[J]. Water Research,2018-01-01,143