Bioethanol production from coconut pulp residue using hydrothermal and postalkaline pretreatment. (3rd June 2020)

• Record Type: Journal Article
• Authors: Mariano, Alissandra Pauline B.; Unpaprom, Yuwalee; Ponnusamy, Vinoth Kumar; Ramaraj, Rameshprabu
• Other Names: Atabani Abdulaziz E. guestEditor.
• Is Part Of: International journal of energy research. Volume 45:Number 6(2021)
• Page Start: 8140
• Page End: 8150
• Publication Date: 2020-06-03
• Subjects: alkaline pretreatment -- bioethanol -- coconut pulp residue -- hydrothermal pretreatment; Power resources -- Periodicals; Power (Mechanics) -- Periodicals; Power resources -- Research -- Periodicals; 621.042
• DOI: 10.1002/er.5544
• Languages: English
• ISSNs: 0363-907X

Abstract

Summary: The objective of this study is to explore the feasibility of sequential hydrothermal and alkaline pretreatment in improving enzymatic hydrolysis and sugar production of coconut pulp residue for bioethanol production. Hydrothermal pretreatment with the different heating duration of 20, 40, 60 minutes yielded 32.27, 27.51, and 26.72 g/L of total sugar, respectively. After posttreatment with 1%, 2%, and 3% alkaline treatment, the further increment of almost 90% on sugar production was observed. Compared to the single pretreatment, the combination of hydrothermal and alkaline pretreatment significantly affected the enzymatic hydrolysis. The optimum condition for efficient hydrolysis was 40 minutes hydrothermal pretreatment, followed by 1% NaOH posttreatment. At these conditions, the total and reducing sugar was 257.14 ± 0.92 and 102.86 ± 0.82 g/L and the maximum ethanol achieved was 27.19 g/L on the 48 hours of fermentation with efficiency and ethanol productivity of 51.83% and 0.57 g/L/h, respectively. Abstract : This study feedstock is valuable in the massive coconut production countries. Huge amount of coconut pulp residue (CPR) is considered as a waste. Therefore, instead of ending up as waste, CPR was used for bioethanol production. Optimum condition for efficient hydrolysis was 40 min hydrothermal pre‐treatment with 1% NaOH post‐treatment. Highest ethanol yields 27.19 (g/L) was reached at 48 h fermentation. Also, this research clearly demonstrates a way of creating an economically valuable product from the CPR.