Valorization of palm oil wastes into oyster mushrooms (Pleurotus HK-37) and biogas production
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Date
2023-10-04
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Qeios
Abstract
Continued growth of oil palm cultivation for palm oil production has led to higher post-processing wastes that pose
environmental management challenges. The goal of this study was to investigate the co-production of oyster
mushroom Pleurotus HK-37 and biogas as a means to add value to palm oil waste fractions and thus reduce their
impact on the environment. A total of 9 blends of solid, semi-solid and liquid palm oil waste fractions were subjected to
mushroom production and the resulting spent mushroom substrate (SMS) was used for biogas production. There was a
significant difference in mushroom yield (t-test, p = 0.00013237) and biological efficiency (t-test, p = 0.00044955), with
the highest values obtained from substrate formulation no. 3 (1:1 PMF and EFB (each 49% total weight) supplemented
with POME and SD at 1%). Biogas production was also significantly different among both fresh and pretreated (SMS)
waste fractions. The highest biogas volume, methane content and methane yield were observed from SMS waste
fractions no. 4 (1:1 PMF and EFB (each 44% total weight) supplemented with PPC and PKS at 5% and POME and SD
at 1%). Overall, pretreatment of palm oil processing waste with oyster mushrooms increased biogas production and
methane yield per kg volatile solids by 102.78% compared to untreated waste. This study has demonstrated that
mushroom and biogas production are viable options for the management of palm oil processing waste fractions and
thus promoting a circular economy. Further studies should optimize their production and conduct techno-economic
Sustainable Development Goals
This research article was published in the Qeios in 2023
Keywords
Valorization, Palm oil wastes, Pleurotus HK-37, African oil palm, Elaeis guineensis, Spent mushroom substrate, Circular economy