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Enzymatic saccharification of dilute acid pretreated saline crops for fermentable sugar production

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  • Zheng, Yi
  • Pan, Zhongli
  • Zhang, Ruihong
  • Wang, Donghai

Abstract

Four saline crops [athel (Tamarix aphylla L), eucalyptus (Eucalyptus camaldulensis), Jose Tall Wheatgrass (Agropyron elongatum), and Creeping Wild Ryegrass (Leymus triticoides)] that are used in farms for salt uptake from soil and drainage irrigation water have the potential for fuel ethanol production because they don't take a large number of arable lands. Dilute sulfuric acid pretreatment and enzymatic hydrolysis were conducted to select the optimum pretreatment conditions and the best saline crop for further enzymatic hydrolysis research. The optimum dilute acid pretreatment conditions included T = 165 °C, t = 8 min, and sulfuric acid concentration = 1.4% (w/w). Creeping Wild Ryegrass was decided to be the best saline crop. Solid loading, cellulase and [beta]-glucosidase concentrations had significant effects on the enzymatic hydrolysis of dilute acid pretreated Creeping Wild Ryegrass. Glucose concentration increased by 36 mg/mL and enzymatic digestibility decreased by 20% when the solid loading increased from 4 to 12%. With 8% solid loading, enzymatic digestibility increased by over 30% with the increase of cellulase concentration from 5 to 15 FPU/g-cellulose. Under given cellulase concentration of 15 FPU/g-cellulose, 60% increase of enzymatic digestibility of pretreated Creeping Wild Ryegrass was obtained with the increase of [beta]-glucosidase concentration up to 15 CBU/g-cellulose. With a high solid loading of 10%, fed-batch operation generated 12% and 18% higher enzymatic digestibility and glucose concentration, respectively, than batch process.

Suggested Citation

  • Zheng, Yi & Pan, Zhongli & Zhang, Ruihong & Wang, Donghai, 2009. "Enzymatic saccharification of dilute acid pretreated saline crops for fermentable sugar production," Applied Energy, Elsevier, vol. 86(11), pages 2459-2465, November.
    • Handle: RePEc:eee:appene:v:86:y:2009:i:11:p:2459-2465
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    1. Chen, Wei-Hsin & Tu, Yi-Jian & Sheen, Herng-Kuang, 2011. "Disruption of sugarcane bagasse lignocellulosic structure by means of dilute sulfuric acid pretreatment with microwave-assisted heating," Applied Energy, Elsevier, vol. 88(8), pages 2726-2734, August.
    2. Zhu, Shengdong & Huang, Wenjing & Huang, Wangxiang & Wang, Ke & Chen, Qiming & Wu, Yuanxin, 2015. "Pretreatment of rice straw for ethanol production by a two-step process using dilute sulfuric acid and sulfomethylation reagent," Applied Energy, Elsevier, vol. 154(C), pages 190-196.
    3. Tian, Shen & Zhu, Junyong & Yang, Xiushan, 2011. "Evaluation of an adapted inhibitor-tolerant yeast strain for ethanol production from combined hydrolysate of softwood," Applied Energy, Elsevier, vol. 88(5), pages 1792-1796, May.
    4. Wirawan, Ferdian & Cheng, Chieh-Lun & Lo, Yung-Chung & Chen, Chun-Yen & Chang, Jo-Shu & Leu, Shao-Yuan & Lee, Duu-Jong, 2020. "Continuous cellulosic bioethanol co-fermentation by immobilized Zymomonas mobilis and suspended Pichia stipitis in a two-stage process," Applied Energy, Elsevier, vol. 266(C).
    5. Wirawan, Ferdian & Cheng, Chieh-Lun & Kao, Wei-Chen & Lee, Duu-Jong & Chang, Jo-Shu, 2012. "Cellulosic ethanol production performance with SSF and SHF processes using immobilized Zymomonas mobilis," Applied Energy, Elsevier, vol. 100(C), pages 19-26.
    6. Mesa, Leyanis & González, Erenio & Ruiz, Encarnación & Romero, Inmaculada & Cara, Cristóbal & Felissia, Fernando & Castro, Eulogio, 2010. "Preliminary evaluation of organosolv pre-treatment of sugar cane bagasse for glucose production: Application of 23 experimental design," Applied Energy, Elsevier, vol. 87(1), pages 109-114, January.
    7. He, Jie & Zhang, Wennan, 2011. "Techno-economic evaluation of thermo-chemical biomass-to-ethanol," Applied Energy, Elsevier, vol. 88(4), pages 1224-1232, April.
    8. Moretti, Marcia Maria de Souza & Bocchini-Martins, Daniela Alonso & Nunes, Christiane da Costa Carreira & Villena, Maria Arévalo & Perrone, Olavo Micali & Silva, Roberto da & Boscolo, Maurício & Gomes, 2014. "Pretreatment of sugarcane bagasse with microwaves irradiation and its effects on the structure and on enzymatic hydrolysis," Applied Energy, Elsevier, vol. 122(C), pages 189-195.
    9. Ranjan, Amrita & Khanna, Swati & Moholkar, V.S., 2013. "Feasibility of rice straw as alternate substrate for biobutanol production," Applied Energy, Elsevier, vol. 103(C), pages 32-38.
    10. Kang, Shimin & Fu, Jinxia & Zhang, Gang, 2018. "From lignocellulosic biomass to levulinic acid: A review on acid-catalyzed hydrolysis," Renewable and Sustainable Energy Reviews, Elsevier, vol. 94(C), pages 340-362.
    11. Shafiei, Marzieh & Zilouei, Hamid & Zamani, Akram & Taherzadeh, Mohammad J. & Karimi, Keikhosro, 2013. "Enhancement of ethanol production from spruce wood chips by ionic liquid pretreatment," Applied Energy, Elsevier, vol. 102(C), pages 163-169.
    12. Park, Yong Cheol & Kim, Jun Seok, 2012. "Comparison of various alkaline pretreatment methods of lignocellulosic biomass," Energy, Elsevier, vol. 47(1), pages 31-35.
    13. Byun, Jaewon & Han, Jeehoon, 2020. "Economic feasible strategy of cellulosic biofuels: Co-production of pentanediols," Energy, Elsevier, vol. 193(C).
    14. Borujeni, Nasim Espah & Karimi, Keikhosro & Denayer, Joeri F.M. & Kumar, Rajeev, 2022. "Apple pomace biorefinery for ethanol, mycoprotein, and value-added biochemicals production by Mucor indicus," Energy, Elsevier, vol. 240(C).
    15. Lou, Rui & Wu, Shu-bin, 2011. "Products properties from fast pyrolysis of enzymatic/mild acidolysis lignin," Applied Energy, Elsevier, vol. 88(1), pages 316-322, January.

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