Optimization of dilute acetic acid pretreatment of mixed fruit waste for increased methane production

Shouvik Saha, Byong Hun Jeon, Mayur B. Kurade, Shekhar B. Jadhav, Pradip K. Chatterjee, Soon Woong Chang, Sanjay Prabhu Govindwar, Sun Joon Kim

Research output: Contribution to journalArticle

14 Scopus citations

Abstract

A proper waste management practice such as anaerobic digestion for the waste generated by the agro-food industries could minimize the amount of material disposal to landfill. In our study, the improvement of methane production was elucidated through the pretreatment optimization of the mixed fruit wastes (FW). Dilute acetic acid pretreatment of FW was optimized in order to increase the bioavailability and microbial accessibility. A maximum sugar recovery of 95% was achieved from the pretreated FW under the optimized conditions (0.2 M acetic acid, 62.5 °C, and 30 min). Fourier transform infrared spectroscopy (FTIR) and Thermogravimetric (TG) analyses verified the presence of cellulosic material in the pretreated FW. X-ray diffraction (XRD) analysis indicated that the crystallinity index was increased to 56% after the disruption of complex hemicellulosic structures during pretreatment. Increased porosity and surface roughness of pretreated FW for better microbial attachment were confirmed in scanning electron microscopy (SEM). Anaerobic digestion showed increased methanogenic activity (10.17 mL g−1 VSinitial d−1) in pretreated FW, during 86-day experimental period due to better microbial attachment and accessibility during the digestion process. Higher methane yield of 53.58 mL g−1 VSinitial was observed in pretreated FW. Thus, acetic acid pretreatment is an effective method to improve the utilization and conversion of FW to methane.

Original languageEnglish
Pages (from-to)411-421
Number of pages11
JournalJournal of Cleaner Production
Volume190
DOIs
Publication statusPublished - 2018 Jul 20

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Keywords

  • Acetic acid
  • Anaerobic digestion
  • Fruit waste
  • Pretreatment
  • Response surface methodology
  • Solid waste management

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