Lignocellulosic Corn Stover Biomass Pre-Treatment by Deep Eutectic Solvents (DES) for Biomethane Production Process by Bioresource Anaerobic Digestion

Abstract

The valorization study of the largely available corn stover waste biomass after pretreatment with deep eutectic solvent (DES) for biomethane production in one-liter glass bioreactors by anaerobic digestion for 21 days was presented. Ammonium thiocyanate and urea deep eutectic solvent pretreatments under different conditions in terms of the components ratio and temperature were examined on corn stover waste biomass. The lignocellulose biomass was characterized in detail for its chemistry and morphology to determine the effect of the pretreatment on the natural biocomposite. Furthermore, the implications on biomethane production through anaerobic digestion with different loadings of corn stover biomass at 35 g/L and 50 g/L were tested. The results showed an increase of 48% for a cumulative biomethane production for a DES-pretreated biomass, using a solid-to-liquid ratio of 1:2 at 100 °C for 60 min, which is a strong indication that DES-pretreatment significantly enhanced biomethane production.

Hemp Cryo-milling and the Impact of Alkaline Pretreatment on Biochemical Conversion

“…Around 1430 cm –1 are CH 2 vibrations in cellulose, while lignin signatures are contained at 1660 cm –1 with C–O double bond stretching, 1600 cm –1 with aromatic skeletal vibrations, and 1515 cm –1 with C–C double bond stretching from aromatic rings . Additional bands between 1750 to 1550 cm –1 have shown to be associated with hemicellulose complexes. , The final region between 1200 to 800 cm –1 most strongly shows signatures from lignin and cellulose. These signatures include O–H stretching in lignin, C–O–C stretching in the β-(1–4) glycosidic bonds in cellulose, and C–O/C–C stretching also in cellulose and hemicellulose .…”

“…31 Additional bands between 1750 to 1550 cm −1 have shown to be associated with hemicellulose complexes. 30,32 The final region between 1200 to 800 cm −1 most strongly shows signatures from lignin and cellulose. These signatures include O−H stretching in lignin, C−O−C stretching in the β-(1−4) glycosidic bonds in cellulose, and C−O/C−C stretching also in cellulose and hemicellulose.…”

Deep Eutectic Solvents as pretreatment for viscose production

“…Olugbemide et al ( 2021) used ammonium thiocyanate and urea DES to increase biomethane production from corn stover. Speci cally, biomethane production was increased by 48% when biomass was pretreated at a 1:2 biomass:DES ratio and 100 ºC and 60 min (Olugbemide et al, 2021).…”

Characterization of Thermoplastic Starch Plasticized with Ternary Urea-Polyols Deep Eutectic Solvent with Two Selected Fillers: Microcrystalline Cellulose and Montmorillonite

“…In the last two decades, interest in ionic liquids (ILs) as polysaccharide processing media rapidly increased [ 11 , 12 , 13 ]. Due to the high cost of ILs and often non-green character, deep eutectic solvents are used as more eco-friendly tailorable, alternative media not only for starch treatment (e.g., plasticizing, dissolution) [ 14 , 15 , 16 , 17 , 18 , 19 ] but also for polysaccharides processing such as their extraction [ 20 , 21 ], biomass pretreatment (e.g., delignification, fractionization, and separation) [ 22 , 23 , 24 ]. DES are mixtures that exhibited phase transition temperatures at much lower temperature that their components.…”