Sirahi, et al (2024) Integrating BiocharBiochar is a carbon-rich material created from biomass decomposition in low-oxygen conditions. It has important applications in environmental remediation, soil improvement, agriculture, carbon sequestration, energy storage, and sustainable materials, promoting efficiency and reducing waste in various contexts while addressing climate change challenges. More in Anaerobic Digestion: Insights into Diverse Feedstocks and Algal Biochar. Environmental Technology & Innovation. https://doi.org/10.1016/j.eti.2024.103814

Biochar, a carbon-rich material produced from the pyrolysisPyrolysis is a thermochemical process that converts waste biomass into bio-char, bio-oil, and pyro-gas. It offers significant advantages in waste valorization, turning low-value materials into economically valuable resources. Its versatility allows for tailored products based on operational conditions, presenting itself as a cost-effective and efficient More of biomassBiomass is a complex biological organic or non-organic solid product derived from living or recently living organism and available naturally. Various types of wastes such as animal manure, waste paper, sludge and many industrial wastes are also treated as biomass because like natural biomass these More, is gaining attention for its potential in anaerobic digestion (AD). This process not only enhances biogas production but also supports sustainable waste management by converting waste into valuable resources. Recent studies have focused on biochar derived from macroalgae and microalgae, which are abundant and fast-growing resources. Algal biochar, when introduced into AD systems, improves the stability and efficiency of biogas production by fostering microbial activity and optimizing nutrient retention.

The incorporation of biochar in AD offers numerous benefits. Its porous structure facilitates microbial colonization, enhancing methane production and reducing nutrient loss. Additionally, biochar helps to buffer the AD environment, stabilizing pHpH is a measure of how acidic or alkaline a substance is. A pH of 7 is neutral, while lower pH values indicate acidity and higher values indicate alkalinity. Biochars are normally alkaline and can influence soil pH, often increasing it, which can be beneficial More levels and mitigating issues like volatile fatty acids accumulation, which can inhibit the process. Algal biochar, due to its high nitrogen content, further enhances the catalytic activity within the AD system, improving overall process stability.

As the world shifts towards circular economies, integrating biochar in AD processes provides a zero-waste solution, reducing environmental impacts and promoting renewable energy production. With continued research, particularly on the use of algal biochar, this approach could significantly advance sustainable energy solutions and waste valorization efforts.

Key areas for future exploration include optimizing biochar production methods, assessing environmental impacts, and scaling up its use in AD systems.