Pre-treatments of RD-MAEJO 2 rice straw for enhancing methane potential

Name: Kannika Sanpakdee

Organization : Maejo University. School of Renewable Energy

Name: Rotjapun Nirunsin

Organization : Maejo University. School of Renewable Energy

Email : rotjapun@gmail.com

Name: Chayanon Sawatdeenarunat

Organization : AsianChiang Mai Rajabhat University. Development College for Community Economy and Technology

keyword: Anaerobic digestion

ThaSH: Biogas -- Production

ThaSH: Rice straw

ThaSH: Crop residues

Abstract: Rice straw is one of the abundant agricultural residues in northern Thailand. However, this biomass has been rarely used for energy production. In addition, it was reported that glutinous rice species RD-MJU 2 was the popular strain cultivating in Chiang Mai for both consumption and trading. Unfortunately, during harvesting process, rice straw is left in the field and subsequently burnt for land preparation of the next crop One of the appropriate strategies to handle this biomass is converting it to biogas which is the well-known and promising renewable energy form following waste-to-energy concept. This method could effectively address environmental and energy security issues at the same time. In this study, biogas productions from RDMAEJO 2 rice straw using cow manure as an inoculum were studied using various pretreatment technics. The ratio between substrate and inoculum was controlled at 1:2 (w/v). After that, the rice straws were pre-treated using 4 different methods including 2 percent (w/v) Sodium hydroxide at ambient temperature (NaOH 2 percent), pre-acidification at ambient temperature for 72 h (pre-acidification 72 h), autoclaved at 121 degrees 15 psi 20 min (autoclave), and Sodium hydroxide 2 percent (w/v) at ambient temperature with autoclave at 121 degrees 15 psi 20 min (NaOH 2 percent with autoclave). Moreover, the unpretreated biomass was also used as the control. Anaerobic digestion systems were operated in batch mode at Mesophilic condition (35+2 degrees) for 45 days. The cumulative biogas yield in the system of pre-treatment using NaOH 2 percent coupled with autoclave presented the maximum content of 652.56 NmL /g VS added following by NaOH 2 percent, without pre-treatment, pre-acidification 72 h, autoclave of 633.40, 552.25, 544.57 and 523.56 NmL /g VS added, respectively. The cumulative methane yield were 366.73, 336.97, 294.91, 275.01 and 261.52 NmL /g VS added, respectively. The methane content of 65.0 percent, 62.3 percent, 60.5 percent, 58.2 percent, 57.0 percent respectively. Thus, it could be concluded that after proper pre-treatment, the RD-MAEJO 2 rice straw could be potentially served as the substrate for producing biogas as an alternative energy and mitigate the open burning of this agricultural residue.

King Mongkut's University of Technology North Bangkok. Central Library

Address: BANGKOK

Email: library@kmutnb.ac.th

Created: 2021

Modified: 2023-05-23

Issued: 2023-05-23

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BibliograpyCitation : In Thai Society for Biotechnology. Thai Society for Biotechnology and International Conference Online (TSB Online 2021) (pp.229-237). Bangkok : Thai Society for Biotechnology

eng

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