Abstract
Substrate accessibility by an enzyme is the rate-limiting step in cellulose digestion. The newly schematized humic acid (HA)-assisted alkali pretreatment was done to delignify and upgrade the bagasse’s characteristics for the pragmatic accessibility of the enzyme. The proposed pretreatment resulted in ~90–100% lignin recovery with distinctive properties. After delignification, the upgraded biomass harnessed as solid support to immobilize the enzyme, ultimately reducing the cost and step for designing physical support for immobilization. HA, an active ligand, with its enriched functional moieties such as carboxyl, carbonyl, hydroxyl, and amide group, bind prior to the substrate (i.e., delignified bagasse) that immobilizes enzyme and hydrolyses cellulose portion. The interaction mechanisms of pretreated bagasse with enzyme were demonstrated through molecular docking using Auto Dock software and UV (Ultraviolet) Spectrophotometric analysis. The pretreatment efficiency was analyzed as a case study in a large-scale reactor by subjecting pretreated bagasse to batch enzymatic hydrolysis with a low enzyme-loading rate of 14 FPU/g of cellulose. Cellulose conversion of 88% (i.e., 20.92 g/L of glucose) was achieved in 48 h, respectively. Subsequently, the flat-sheet cross-flow ultrafiltration (UF) membrane-based continuous recycling unit was operated at a flux of 22.5 L/m2hr toward the purification of glucose (i.e., 15.75 g/L of glucose). The performance of PES10-UF membrane module chaperoning with hydrolysis reactor for the designed hydrolysis scheme was examined in light of critical flux, pure water permeability, and irreversible fouling studies. The flow rate of 300 LPH (L/hr) and the transmembrane membrane pressure (TMP) of 1.5 bar showed high antifouling performance.
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Acknowledgements
The Department of Biotechnology, Government of India, has funded part of this research work under the bilateral collaboration between India and Brazil (DBT- India, and MCTI-CNPq-Brazil) vide no. DBT/In-Bz/2013-16/06. The authors are also thankful to the Department of Science and Technology, Government of India (DST) for the grants under the DST-FIST (Level-I) Program [SR/FST/ETI-405/2015(C)] with which the infrastructure for the present research was developed. All the authors are grateful to Dr. Utpal Adhikari, Assistant professor, Department of chemistry, NIT Durgapur, for the valuable guidance and suggestions for upgrading the working strategies during the implementation of the project. The authors would like to express our sincere gratitude to Prof. Hassan A. Arafat (Center for Membrane and Advanced Water Technology, Khalifa University, Abu Dhabi, United Arab Emirates) for the help extended toward improving the language of the manuscript.
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Maheswari, R.U., Thirugnanasambantham, K., Mondal, A. et al. Enzymatic hydrolysis of structurally upgraded lignocellulosic biomass with the aid of humic acid: a case study in a membrane integrated bioreactor. Environ Dev Sustain 25, 4033–4064 (2023). https://doi.org/10.1007/s10668-022-02233-6
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DOI: https://doi.org/10.1007/s10668-022-02233-6