2.3 Research on High-Efficient Anaerobic Fermentation Technology …
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good performance in the methanogenic stage during a two-stage process is to control
the fermentation type in the hydrogenogenic stage by SHP.
2.3.1.3 DOM
The DOM in the effluent of fermentation obtained from the anaerobic fermentation process of two stages was composed of lots of fluorescence compounds, and
fluorescence peaks of different compounds were probably overlapped. PARAFAC
analysis is a multivariate chemometric method capable of decomposing EEM spectra
into various fluorescent components independent of each other. It offers the accurate
quantitative information on the component distribution in the DOM fractions. The
researchers identified three components, marked 1, 2, and 3, from the EEM spectra by the FEMS-PFA and in Fig. 2.19 the fluorescence intensity is expressed as
F max . Component 1 consisting of two fluorescence peaks is located at the highest
Fig. 2.19 F max of the three fluorescent components by the FEMS-PFA from the different AD
processes (Jia et al. 2017a)