ABSTRACT
This chapter discusses the optimized parameters of AD, technological advancements, and applications of biogas. Temperature is a significant parameter in biogas production because of the involvement of microorganisms that show sensitivity with the change in their surroundings. Thermophilic digestion has a 50% higher degradation rate, and due to this, fat-containing substrates easily break on higher temperature range, provide optimum raw materials for microorganisms food, and obtain a higher yield of biogas production. Although mesophilic range of temperature is most favourable for the hydrolysis phase and similarly thermophilic range of temperature for the methanogenesis, substrate materials can change the operating optimized temperature ranges of various biogas production phases. Microorganisms decompose substrate materials continuously for biogas production in an anaerobic digester. During the AD process, microorganisms continuously consume organic materials to produce biogas, thus, a feed-up of organic substrate materials in the digester at regular intervals is required.
