Table 1.
Effect of pretreatments on compositional characteristics of Sargassum spp. UT = Untreated; WW = Water washing; S+W = Soaking + Warm water washing; CS = Chemical soaking.
Fig 1.
Changes in the compositional characteristics (% dry weight) of Sargassum spp. by the effect of pretreatments.
UT = Untreated, WW = Water washing, S+W = Soaking + Warm water washing, CS = Chemical soaking.
Table 2.
Influence of pretreatments on the content of mineral salts and total removal in the biomass of Sargassum spp. UT = Untreated, WW = Water washing, S+W = Soaking + Warm water washing, CS = Chemical soaking.
Table 3.
A summary of the results of the biomethane potential test of untreated and pretreated Sargassum spp. after 70 days of incubation and 53 days for cellulose.
Fig 2.
Cumulative methane production expressed in N mL·g-1 VS of pretreated and untreated Sargassum spp. biomass after 70 days of incubation.
UT = Untreated, WW = Water washing, S+W = Soaking + Warm water washing, CS = Chemical soaking. Error bars represent the standard deviation of the mean (n = 3).
Fig 3.
Heat map of Spearman’s correlation analysis between the compositional characteristics of Sargassum spp. and BMP/BI.
Cel = Cellulose; Hcel = Hemicellulose; Lig = Lignin; TPC = Total phenolic content. The mark * indicates the significance test (p <0.05).
Table 4.
Alpha-diversity indices of the different microbial communities.
WW = Water washing, CS = Chemical soaking.
Fig 4.
Relative abundances of bacterial communities at the phylum (a) and genus (b) level of the inoculum, WW (water washing), and CS (chemical soaking). Taxa with abundances <1% of the total sequences in the samples were grouped as other.
Fig 5.
Relative abundances of archaeal communities at the phylum (a) and genus (b) level of the inoculum, WW (water washing), and CS (chemical soaking). Taxa with abundances <2% of the total sequences in the samples were grouped as other.