title: Efficiency of the anaerobic digestion of amine wastes.
abstract: Laboratory-scale anaerobic degradation of monoethanolamine waste (MEAw) with co-substrate organics was conducted at room temperature and organic loading rates from 0.19 to 5.03 kg COD/m(3) day for 486 days in a hybrid digester. 90 % feed COD conversion to methane was obtained at the lower loads and only 45 % at the highest MEA waste/COD ratio (MEAwr) of 0.62 due to inhibition of methanogenesis. Inhibition at comparable loads decreased with time, implying that the culture adapted to the challenging feed. Methane yield was negatively correlated to MEAwr applied and inhibition avoided at MEAwr <0.5. Acetate accumulation implies inhibition of acetoclastic methanogenesis that can be caused by ammonia, a product of MEAw degradation. Moderate total ammonia nitrogen and free ammonia nitrogen accumulation, maximum 2.2 g N/l and 90 mg N/l, respectively suggests, however, that other components of MEAw, and/or degradation products of such, also inhibit methanogenesis, disturbing the digester performance.
authors.affiliation: Department of Process, Energy, and Environmental Technology, Telemark University College, Kjølnes Ring 56, Postboks 203, 3910, Porsgrunn, Norway, wang.shuai@hit.no.
authors.forename: Shuai
authors.initials: S
authors.lastname: Wang
authors.forename: Jon
authors.initials: J
authors.lastname: Hovland
authors.forename: Rune
authors.initials: R
authors.lastname: Bakke
mesh_terms: D000641:Ammonia / Q000378:metabolism; D000693:Anaerobiosis / Q000502:physiology*; D018533:Biomass; D019149:Bioreactors; D002245:Carbon Dioxide / Q000378:metabolism; D003470:Culture Media / Q000737:chemistry / Q000378:metabolism; D004983:Ethanolamines / Q000737:chemistry / Q000378:metabolism*; D006863:Hydrogen-Ion Concentration; D008697:Methane / Q000378:metabolism; D025341:Principal Component Analysis; D014865:Waste Disposal, Fluid / Q000295:instrumentation / Q000379:methods
chemical_list: D003470:Culture Media; D004983:Ethanolamines; D002245:Carbon Dioxide; D000641:Ammonia; D008697:Methane
references.citation: Water Sci Technol. 2002;45(10):65-73
references.pmid: 12188579
references.citation: Appl Microbiol Biotechnol. 1998 Oct;50(4):495-501
references.pmid: 9830101
references.citation: Biotechnol Lett. 2013 Feb;35(2):219-24
references.pmid: 23108874
references.citation: Bioresour Technol. 2008 Jul;99(10):4044-64
references.pmid: 17399981
references.citation: Water Sci Technol. 2013;67(11):2549-59
references.pmid: 23752388
references.citation: Water Res. 2013 May 1;47(7):2297-306
references.pmid: 23434042