This section presents a review of the scientific literature published in 2017 on topics relating to sustainable bioenergy from biofuel residues and waste. This review is divided into the following sections: Feedstocks, Bioethanol, Biodiesel, Biohydrogen, Hydrogen, Biofuel Residues, Microalgae, Lignocelluloses and other topics.

This article is a review of the scientific literature published in 2019 on topics relating to bioenergy from biofuel residues and waste. This literature review is divided into the following sections: Feedstocks, Biodiesel, Bioethanol, Hydrogen, Biohydrogen, Biofuel Residues, Microalgae, and Lignocelluloses.

This section presents a review of the scientific literature published in 2018 on topics relating to sustainable bioenergy from biofuel residues and waste. This review is divided into the following sections: Feedstocks, Bioethanol, Biodiesel, Biohydrogen, Hydrogen, Biofuel Residues, Microalgae, and Lignocelluloses.

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His work has been focused on engineering education and advancements in the field of environmental engineering. His current research interests are in physicochemical treatment processes with recent applications in drinking water disinfection, lead remediation, sustainable environmental engineering systems, and contaminant transport. Butkus is a Board Certified Environmental Engineer and he is a registered Professional Engineer in the state of Connecticut.