Advancements in Biogas Digester Materials: A Review of Strength, Durability, and Suitability

This paper explores the materials used to construct biogas digesters, essential for sustainable energy production. The study investigates various materials, such as thermoplastics like polyvinyl chloride (PVC), polyethylene (PE), and high-density polyethylene (HDPE), as well as traditional construction elements like masonry, stone, and concrete. It considers metals such as steel and composite materials, which all contribute to the efficacy and strength of biogas digesters. This review's primary goal is to compare these materials' properties, evaluate their structural and functional roles, and determine their suitability for various digester designs. Through a qualitative analysis of existing research, this study highlights innovative ways to integrate multiple materials to enhance biogas technology. Additionally, it looks at the efficiency of ferrous alloys, thermoplastics (PVC, PE, HDPE), cement, and stone digesters-all used to store gas. According to the findings, cement-based materials are the most common choice for small-scale home digesters because of their lifespan and resilience. On the other hand, the selection of materials for commercial or large-scale biogas facilities is contingent upon environmental factors and material attributes, such as thermal, electrical, and physical qualities. However, because plastic digesters are flexible, reusable, and chemical resistant, they are becoming a good substitute in areas where shipping and material availability are problems. SUMMARY: This review's primary goal is to compare thermoplastics, traditional materials, metals, and composites for biogas digester durability and structural efficiency. Cement-based materials dominate small-scale domestic digesters due to resilience, longevity, and cost-effectiveness. Large-scale facilities prioritize material properties (thermal, electrical) and environmental factors for optimal design. Plastic digesters emerge as portable, chemical-resistant solutions in resource-limited regions with logistical challenges. Innovative material integration enhances biogas technology, balancing functionality and sustainability through qualitative research.