Combined inhibitory effect of ammonia and LCFA on biomethanation process
Ammonia and long-chain fatty acids (LCFA) are two major inhibitors of anaerobic digestion (AD),resulting in process instability with suboptimal methane production and even,in some cases,complete process failure.The individual inhibition effects of ammonia and LCFA on AD process have been assessed thoroughly the previous years.However,limited information can be found if the combined inhibitory pressure of ammonia and LCFA on AD exists.Therefore,the aim of the current study was to elucidate how ammonia and LCFA inhibition are affecting each other when both inhibitors are present in the same AD substrate,i.e.potential ammonia-LCFA synergetic co-inhibition of the AD process.Thus,a batch reactor experiment was performed using a thermophilic (55±1℃) manure-based inoculum and testing four ammonia levels (2.6,4.0,5.0 and 7.0 g NH+-N L-1),six LCFA levels (0.05,0.2,0.5,1.0,2.5 and 4.0 g oleate L-1) and all ammonia/LCFA combinations that derived from the previous two experiments.The results did not support the presence of a clear ammonia-LCFA synergetic co-inhibition effect.Additionally,an increased tolerance to LCFA toxicity at higher biomass/LCFA ratios was identified.This result suggests that high biomass/LCFA ratios could protect AD process from LCFA toxicity.Finally,although a synergistic co-inhibitory effect was not established in the current study,the results clearly suggested that co-digestion of protein-rich and lipid-rich substrates could create a strong inhibition effect on the AD process.
Anaerobic digestion Batch reactors Methane Synergistic inhibition
H.Tian I.A.Fotidis P.Karachalios I.Angelidaki
Department of Environmental Engineering, Technical University of Denmark, Bygningstorvet Bygning 115, DK-2800 Kgs.Lyngby, Denmark
国际会议
The 15th IWA World Conference on Anaerobic Digestion( 第15届IWA世界厌氧大会)
北京
英文
465-468
2017-10-17（万方平台首次上网日期，不代表论文的发表时间）