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Modified anaerobic digestion model No.1 ( ADM 1) for modeling anaerobic digestion process at different ammonium concentrations
Author(s) -
Li Xiaonan,
Yang Ziyi,
Liu Guangqing,
Ma Zonghu,
Wang Wen
Publication year - 2019
Publication title -
water environment research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.356
H-Index - 73
eISSN - 1554-7531
pISSN - 1061-4303
DOI - 10.1002/wer.1094
Subject(s) - valeric acid , valerate , acetic acid , chemistry , propionate , anaerobic digestion , butyric acid , digestion (alchemy) , fatty acid , butyrate , anaerobic exercise , chromatography , biochemistry , methane , fermentation , organic chemistry , biology , physiology
Anaerobic digestion ( AD ) is an established method for sustainable energy production. Anaerobic digestion model No.1 ( ADM 1) was used to simulate methane production ( MP ) and volatile fatty acid ( VFA ) concentrations at different ammonium concentrations. In accordance with the incomplete description of several biochemical reactions and the omission of several reaction processes, ADM 1 was modified with the consideration of acetic acid inhibition and valeric acid existence. ADM 1_ac ( ADM 1 added acetic acid inhibition) could obtain better simulation accuracy of MP (goodness‐of‐fit value = 0.945), and VFA concentrations (goodness‐of‐fit values > 0.39) were all higher than ADM 1_original, but cannot explain the valeric acid production. ADM 1_va ( ADM 1 added valeric acid existence) could achieve better simulation of valeric acid (achieving a breakthrough of zero), nevertheless the accuracy of propionic and butyric acids was poorer than ADM 1_ac with differences between experimental and simulation values were 5%–10% lower. With both factors coordinated, MP and VFA concentrations could be simulated accurately by ADM 1_ac_va ( ADM 1 added acetic acid inhibition and valeric acid existence), with the highest goodness‐of‐fit values (>0.85). The results of a verification experiment with ADM 1_ac_va simulation further indicated that acetic acid inhibition and valeric acid as new component were both important in ADM 1. Practitioner pointsADM 1_ac could simulate MP and acetate, propionate and butyrate concentrations better. ADM 1_va could explain the valerate production during AD of glucose. ADM 1_ac_va could simulate AD process quite accurately, with the highest goodness‐of‐fit values (>0.85). Acetate inhibition and valerate existence were both important and should be considered in ADM 1.