Characterization of Nizimuddinia zanardini macroalgae biomass composition and its potential for biofuel production

Abstract

zanardini macroalgae biomass composition and its potential for biofuel production, Bioresource Technology (2014), doi: http://dx.doi.org/10.1016/j.biortech. 2014.10.141 This is a PDF file of an unedited manuscript that has been accepted for publication. As a service to our customers we are providing this early version of the manuscript. The manuscript will undergo copyediting, typesetting, and review of the resulting proof before it is published in its final form. Please note that during the production process errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain. 1 Characterization of AbstractNizimuddinia zanardini macroalgae, harvested from Persian Gulf, was chemically characterized and employed for the production of ethanol, seaweed extract, alginic acid, and biogas. In order to improve the products yields, the biomass was pretreated with dilute sulfuric acid and hot water. The pretreated and untreated biomasses were subjected to enzymatic hydrolysis by cellulase (15 FPU/g) and β-glucosidase (30 IU/g). Hydrolysis yield of glucan was 29.8, 82.5, and 72.7 g/kg for the untreated, hot-water pretreated, and acid pretreated biomass, respectively. Anaerobic fermentation of hydrolysates by S. cerevisiae resulted in the maximum ethanol yield of 34.6 g per kg of the dried biomass. A seaweed extract containing mannitol and a solid residue containing alginic acid were recovered as the main byproducts of the ethanol production. On the other hand, the biogas yield from the biomass was increased from 170 to 200 m 3 per ton of dried algae biomass by hot water pretreatment.

A study on torrefaction of Laminaria japonica

“…In the same year of 2011, Jung et al [40] reported that L. japonica contains 55.1 wt.% of hemicellulose, which may be interesting since hemicellulose is the representative component which decomposes during torrefaction for lignocellulosic biomass. The authors are however rather skeptical about such a high hemicellulose content in macroalga, since all other references are telling that the representative saccharides of macroalga are alginate and mannitol [28,33,39]. Also it seems that Jung et al [40] followed a procedure for analyzing hemicellulose, cellulose and lignin contents, which may not be a relevant procedure for marine biomass.…”

“…Current conversion technologies for macroalgae includes mainly biogas production by anaerobic digestion [28,33], bioethanol production [29,33] and lipid production [30]. It is very natural that all the studies above are of the macroalgae utilization technologies which do not need the drying process of macrolagae, since drying process consumes a considerable amount of energy.…”

Rapid and solvent-saving liquefaction of woody biomass using microwave–ultrasonic assisted technology

“…Catalytic liquefaction is a promising technology for converting biomass to produce sustainable liquid biofuels and chemicals (Yazdani et al, 2015). Traditional biomass liquefaction has usually been carried out in a stirred tank reactor using inorganic acid/alkali as a catalyst at a temperature higher than 150°C for 60 min or longer.…”

Enzymatic Saccharification of Laminaria japonica by Cellulase for the Production of Reducing Sugars

“…Physical, chemical, or biological pretreatment methods can be combined to obtain high yields from enzymatic saccharification [14]. In general, pretreatment methods used prior to biological treatment are γ-irradiation [15], chemical treatment (tap water [16], hydrochloric acid [17,18], sulfuric acid [19][20][21], sulfuric acid and hot water [22]), and hydrothermal treatment (distilled water [23], or distilled water and cellulase saccharification [24,25]). Enzymatic saccharification of brown seaweed has been studied using enzymes such as laminarinases [26], alginate lyases [27], commercial cellulase blends [28], and commercial meicelase [29].…”