MES (multi-energy systems): An overview of concepts and evaluation models

Pretreatment methods to enhance anaerobic digestion of organic solid waste

Globally, there is increasing awareness that renewable energy and energy efficiency are vital for both creating new economic opportunities and controlling the environmental pollution. AD technology is the biochemical process of biogas production which can change the complex organic materials into a clean and renewable source of energy. AcoD process is a reliable alternative option to resolve the disadvantages of single substrate digestion system related to substrate characteristics and system optimization. This paper reviewed the research progress and challenges of AcoD technology, and the contribution of different techniques in biogas production engineering. As the applicability and demand of the AcoD technology increases, the complexity of the system becomes increased, and the characterization of organic materials becomes volatile which requires advanced methods for investigation. Numerous publications have been noted that ADM1 model and its modified version becomes the most powerful tool to optimize the AcoD process of biogas production, and indicating that the disintegration and hydrolysis steps are the limiting factors of co-digestion process. Biochemical methane potential (BMP) test is promising method to determine the biodegradability and decomposition rate of organic materials. The addition of different environmentally friendly nanoparticles can improve the stability and performance of the AcoD system. The process optimization and improvement of biogas production still seek further investigations. Furthermore, using advanced simulation approaches and characterization methods of organic wastes can accelerate the transformation to industrializations, and realize the significant improvement of biogas production as a renewable source and economically feasible energy in developing countries, like China. Finally, the review reveals, designing and developing a framework, including various aspects to improve the biogas production is essential.

Anaerobic co-digestion process for biogas production: Progress, challenges and perspectives

https://bura.brunel.ac.uk/bitstream/2438/15552/4/Fulltext.pdf

Municipal solid waste management and waste-to-energy in the context of a circular economy and energy recycling in Europe

Biofuels productions from microalgae received wide attention recently and have high potential to replace fossil fuels. This paper served as a platform to critically review current production technologies of microalgae, ranging from cultivation, harvesting, extraction and several biofuels conversion processes. In addition, due to the high photosynthetic efficiency of microalgae, mass cultivation of microalgae is believed to be able to efficiently reduce the carbon dioxide emission to atmosphere and thus, reducing the impact of global warming. This is because microalgae have high growth rate and is able to develop maximum of 70% of lipid content within their cells depending on species. Apart from that, microalgae have the ability to survive under harsh condition and occupied smaller cultivation land area than other land crops. The harvested microalgae biomass can be used for electrical generation, while its crude lipid can be used as transportation fuel as it has 80% average energy content of petroleum. In the present paper, a detailed discussion to produce biodiesel, fuel gas, bio-oil, methane, hydrogen and alcohol from microalgae biomass are also included. Besides, updated research, challenges and the way forward of microalgae biofuels are also presented. In future, biofuels production from microalgae can be economical viable at some scale, which is then profitable in terms of economics and also environment.

Microalgae biofuels as an alternative to fossil fuel for power generation

Methane production through anaerobic digestion: Participation and digestion characteristics of cellulose, hemicellulose and lignin

Property impacts on Carbon Capture and Storage (CCS) processes: A review

Mixing in an anaerobic digester keeps the solids in suspension and homogenizes the incoming feed with the active microbial community of the digester content. Experimental investigations have shown ...

Effects of mixing on the result of anaerobic digestion: Review

Long-term optimization of cogeneration systems in a competitive market environment

Tillner-Roth and Friend have presented a new correlation for the thermodynamic properties of ammonia–water mixtures. In this study, the new correlation has been compared to other correlations used in simulations of power cycles using ammonia–water mixtures as working fluids. The saturation properties for mixtures, calculated with the different correlations, have been examined at different temperatures and pressures. Available experimental data have been included in the comparison. The variation of the enthalpy with temperature at different pressures for a mixture has also been compared. The correlations have been examined for use in power cycle simulations as well. The comparison reveals that the new correlation shows a more reasonable behavior when the critical point of the mixture is approached. At lower temperatures and pressures, the compared correlations give very similar results. The differences in the results from the cycle simulations, using different correlations, are small but they tend to increase with increasing maximum pressure in the cycle.

Eva Thorin

Papers

Methane production through anaerobic digestion: Participation and digestion characteristics of cellulose, hemicellulose and lignin

Property impacts on Carbon Capture and Storage (CCS) processes: A review

Effects of mixing on the result of anaerobic digestion: Review

Long-term optimization of cogeneration systems in a competitive market environment

Comparison of Correlations for Predicting Thermodynamic Properties of Ammonia–Water Mixtures