Leveraging microalga feedstock for biofuel production and wasteland reclamation using remote sensing and ex situ experimentation

Abstract

Abstract Biofuel production becomes a sustainable developmental strategy, when wastelands are reprocessed as prospective mass culture sites (PMCS) for microalgae feedstock. Remote Sensing (RS) data and field visits were used to delineate eutrophic water bodies for PMCS. The floodplains of the Brahmaputra River Valley of Assam, India, were selected as PMCS and were defined using RS data. A green alga of the genus Parachlorella was isolated from an algal bloom present in the drainage system, of Tezpur University, Assam, India. The species was cultured in representative water samples from the PMCS and growth was monitored in open laboratory conditions against the control. The microalgal biomass was characterized and subjected to in situ transesterification. The fuel properties such as viscosity, density, calorific value and cetane number (CN) were determined to assess the fuel quality. The results showed the biodiesel fuel properties were within the American Society for Testing and Materials (ASTM) purview. Additionally, the thermo-chemical conversion and subsequent characterization underscored the feasibility of bio-oil production from open laboratory culture of microalgae. This study highlights the practicability of combining RS data and experimental appraisal for cost effective, environment friendly and sustainable biofuel production, from microalgae cultured in wasteland PMCS.