Alkaline hydrogen peroxide pretreatment of cladodes of cactus (opuntia ficus-indica) for biogas production

Jemal Beshir Belay,Nigus Gabbiye Habtu,Venkata Ramayya Ancha,Ali Seid Hussen

doi:10.1016/j.heliyon.2021.e08002

Jemal Beshir Belay, Nigus Gabbiye Habtu + Show 2 more

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https://doi.org/10.1016/j.heliyon.2021.e08002

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Journal: Heliyon	Publication Date: Sep 1, 2021
Citations: 12	License type: cc-by

Affiliation: Jimma University, Bahir Dar University

Abstract

The alkaline hydrogen peroxide (AHP) pretreatment of cladodes of cactus (Opuntia ficus-indica) for biogas production was evaluated based on the delignification of cladodes of cactus. The effects of alkaline hydrogen peroxide concentration (30% w/w solution) and the pretreatment time (3, 6, 9, and 12 h) were evaluated at pH 11.5, temperature of 30 °C, and 180 rpm for removal of lignin.A batch of anaerobic digestion experiments were conducted at mesophilic temperature conditions (37 ± 1 °C) with the pretreated biomass. The feed stock (cladodes of cactus) used in this study contained 12.51 ± 1.25 cellulose, 16.34 ± 2.93% hemicellulose, and 10.45 ± 2.31% lignin, and the balance were (carbohydrate, protein, lipid, and ash). After AHP pretreatment, the lignocellulosic content of the feed stock was changed to 12.50 ± 1.84%, 13.63 ± 3.23%, and 7.49 ± 3.05% for cellulose, hemicellulose, and lignin respectively. The AHP pretreatment of cladodes of cactus highly affected the lignin structure relative to cellulose and hemicellulose. The alkaline hydrogen peroxide pretreatment resulted in a higher amount of biogas produced from 877.9 ± 15.12 ml biogas/g VS to 1613.5 ± 10.76 ml biogas/g VS which is an 83.4% increment and decreased after 9 h treatment to 1398.8 ± 17.8 ml biogas/g VS. In addition, the measured methane yields range from 302.48 ± 0.33 to 602.65 ± 3.24 ml CH4/g VS. The results showed that alkaline hydrogen peroxide pretreatment of cladodes of cactus is an effective strategy for enhance biogas yield.

Highlights

In recent years, bioenergy research has become a focus of many research tailored to the pretreatment of lignocellulose biomass to improve the energy yield
Energy crops need fertile land to grow that is used for agricultural activities, while residential and industrial wastes need different treatment mechanisms to clean them from different unwanted substances that inhibit microbial action in the biogas production routes and the biomethane potential is low [1]
This study showed that alkaline hydrogen peroxide (AHP) pretreatment of cladodes of cactus for biogas production was advantageous in enhancing both the biogas production and the percentage of methane yield

Summary

Introduction

Bioenergy research has become a focus of many research tailored to the pretreatment of lignocellulose biomass to improve the energy yield. Among the bio-energies sources, biogas production from biomass has been recognized worldwide as a low-cost and accessible energy source for low-income countries It yields a good quality of organic fertilizer. Energy crops need fertile land to grow that is used for agricultural activities, while residential and industrial wastes need different treatment mechanisms to clean them from different unwanted substances that inhibit microbial action in the biogas production routes and the biomethane potential is low [1]. Those feedstocks (energy crops, and various residential and industrial waste materials) are less attractive for commercial biogas production due to their dependence on the sources and need lengthy treatment process. The pretreatment method can enhance hydrolysis and avoid the generation of inhibitory by-products [9]

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Results

Conclusion