Globally, one in nine people suffer from undernourishment with evidence that this number is increasing. Additionally, due to the projected 50% increase in global population, the demand in worldwide animal-sourced...
The rigid cell wall
and low carbohydrate content of Taihu algae
inhibit its application for hydrogen generation by anaerobic digestion
(AD). In this study, algae was codigested with food waste (FW) in
order to evaluate the influence of dried/wet condition and different
mixing ratios on the digestion performance, where the dried algae
(DA) showed an advantage over the wet algae (WA) by codigestion with
FW. This was attributed to a suitable C/N ratio, more readily biodegraded
organic substances, and microbial synergistic effect. The peak cumulative
hydrogen production was 31.42 mL of H2/g volatile solid
(VS) when the FW/DA ratio was 40:10, which was 12.13 times higher
than that from DA only (2.59 mL/g VS). Meanwhile, the codigestion
group of FW/DA (40:10) showed the best performance, contributing to
the highest value of 82.06% for the carbohydrate degradation rate,
95.54% for the protein degradation rate, and 11.60 g/kg for the total
soluble metabolite concentration. During the DA codigestion process,
it was found that the readily biodegradable materials in dissolved
organic matter were utilized more fully and with the least amount
of non-biodegradable matter content according to the excitation–emission
matrix fluorescence spectra, which could provide a new insight into
the bioutilization process of cosubstrates. Furthermore, codigestion
selectively enriched hydrogen production bacteria and achieved high
relative abundances of Clostridium sp.
(78.46%) and Bacillus sp. (8.64%) for
more efficient AD performance.
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