Comparative Performance Between Temperaturephased And Conventional Mesophilic Two-Phased Processes In Terms Of Anaerobically Produced Bioenergy From Food Waste  

Oleh:

Youn, Jong-Ho ; Shin, Hang-Sik

Jenis: Article from Journal - ilmiah internasional
Dalam koleksi: Waste Management & Research vol. 23 no. 1 (Feb. 2005), page 32-38.
Topik: Food waste; hydrogen production; methane production; volatile fatty acids; wmr 752–6
Fulltext: 32.pdf (260.55KB)

Isi artikel

Comparative evaluation of bioenergy production from food waste was carried out with both a temperature-phased and a conventional mesophilic two-phased process at different organic loading rates (OLRs). No methane was detected in the temperature-phased thermophilic-acidogenic fermenter at all the OLRs tested. However, a significant amount of methane content was detected in the conventional two-phased mesophilic- acidogenic fermenter, with increments depending on the organic loading rate [from 17% at 3 g VS L–1 day–1 to 25% at 8 g VS L–1 day–1 (VS, volatile solid)]. Acetate and butyrate were the main volatile fatty acids (VFAs) in the temperaturephased thermophilic acidogenic fermenter; conversely propionate was a major VFA in the conventional two-phased mesophilic- acidogenic fermenter. Through the chemical oxygen demand (COD) balance of both temperature-phased and conventional mesophilic two-phased processes, the fraction of the feed-COD converted to the hydrogen-COD in the thermophilic- acidogenic fermenter within the former process was estimated from 7.9 to 9.3%, with a peak at ORL of 6 g VS L–1 day–1, whereas it was quantified from 0.3 to 0.9% in the mesophilicacidogenic fermenter within the latter one. Moreover, the fraction of the feed-COD converted to the methane-COD in the mesophilic-acidogenic fermenter within the conventional twophased process ranged from 5.4 to 7.9%. On the other hand, conversion of the feed-COD to the methane-COD in the mesophilic- methanogenic fermenter of both temperature-phased and conventional mesophilic two-phased processes ranged from 66.2 to 72.3% and from 63.5 to 70.5%, respectively, with decrements related to the increase of organic loading rate.

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