title: Using fluorescence excitation-emission matrix spectroscopy to monitor the conversion of organic matter during anaerobic co-digestion of cattle dung and duck manure.
abstract: In this study, the removal of volatile solids (VSs) and soluble chemical oxygen demand (SCOD) by co-digesting cattle dung (CD) and duck manure (DM) was determined and compared with the reduction achieved with CD or DM digestion alone. Moreover, fluorescence excitation-emission matrix spectroscopy was utilised to characterise the conversion mechanisms of organic nitrogen. It was found that the co-digestion provided 71% VS reduction compared with 58% for CD and 61% for DM. The amounts of COD removed were 28%, 23% and 31% for CD, DM and the mixture, respectively. Tyrosine-like/fulvic-like fluorescence intensity (FI) ratios increased during the initial 15days of co-digestion and were associated with an increase in total nitrogen in the supernatant. After 15days, CD and DM exhibited a lower tryptophan-like/fulvic-like FI ratio (0.8-1.6), whereas the co-digestion remained stable at a high level (3.0-3.6), rendering an improved microbial population and biochemical activity.
authors.affiliation: Laboratory of Water Environmental System Engineering, Chinese Research Academy of Environmental Science, Beijing 100012, China.
authors.forename: Shuming
authors.initials: S
authors.lastname: Wan
authors.forename: Beidou
authors.initials: B
authors.lastname: Xi
authors.forename: Xunfeng
authors.initials: X
authors.lastname: Xia
authors.forename: Mingxiao
authors.initials: M
authors.lastname: Li
authors.forename: Dandan
authors.initials: D
authors.lastname: Lv
authors.forename: Lei
authors.initials: L
authors.lastname: Wang
authors.forename: Caihong
authors.initials: C
authors.lastname: Song
mesh_terms: D000693:Anaerobiosis; D000818:Animals; D001673:Biodegradation, Environmental; D057919:Biological Oxygen Demand Analysis; D019149:Bioreactors; D002417:Cattle; D004372:Ducks; D005243:Feces / Q000737:chemistry*; D008372:Manure / Q000032:analysis*; D009584:Nitrogen / Q000032:analysis; D009930:Organic Chemicals / Q000378:metabolism*; D013050:Spectrometry, Fluorescence / Q000379:methods*; D014835:Volatilization
chemical_list: D008372:Manure; D009930:Organic Chemicals; D009584:Nitrogen