Opportunities for improvement of process technology for biomethanation processes

Abstract

Biomethanation process is a promising eco-friendly solution for the treatment of organic biomass, which leads to effi cient bioenergy production. In this review, it is pointed out that more research and development is necessary to fi nd the best operational conditions and dedicated reactors for treating the target substrates and to make them accessible to rural areas. The present review focuses on the various approaches which can be used to solve the constraints occurring during the gas production. A brief description of possible pretreatments for converting complex lignocellulosic waste to biogas, with the desired range of operational parameters for anaerobic digestion, is highlighted. In addition, suitable reactors for different substrates are reviewed.

Alkali pretreatment at ambient temperature: A promising method to enhance biomethanation of rice straw

“…Addition of micronutrients has been reported to enhance the digestion of agricultural residues (Krishania et al, 2012). Micronutrients such as Fe, Zn, Ni and Co are important to develop biofilm in reactors and to improve the biomethanation efficiency.…”

“…Biomass as a renewable and sustainable form of energy is becoming more important due to its ample availability in India. The availability of biomass in India is ~150 million MT/annum (Krishania et al, 2012). Rice straw is one of the abundant, renewable lignocellulosic biomass in India.…”

Low-temperature and Low-pressure HydroThermal Liquefaction (L-HTL) of biomass using ultrasonic cavitation to achieve a local supercritical state in water

“…Fermentation uses anaerobic bacteria to convert some organic matter into methane, but both processes have low efficiency, with only up to one-third of the feedstock being converted into fuel in both cases [19,20].…”