Effect of different pyrolysis temperatures on biofertilizer properties of microalgal biochar and energy analysis

Year 2025, Volume: 9 Issue: 1, 90 - 97, 17.03.2025

Önder Uysal

https://doi.org/10.31015/2025.1.11

Abstract

In this study, Chlorella sp. (Cs), Chlorella vulgaris (Cv), Neochloris conjuncta (Nc), Botryoococcus braunii (Bb), and Scenedesmus obliquus (So) microalgae strains were cultivated in channel type ponds. The microalgal biomasses obtained were divided into two groups (350 and 600 °C). The microalgal biomasses in the first group were biocharized at two different pyrolysis temperatures, while those in the second group were untreated crude microalgal biomasses. As a result of the energy input-output analysis of both groups of microalgal biomasses, the highest net energy gain was calculated in the un-treated Cv strain with 52.41, while the lowest value was calculated in the biocharification process of So and Bb strains at 600°C with 13.03. In all groups, the energy efficiency, energy ratio, and net energy gain of the Cv strain were found to be higher than other microalgae strains. When the bio-fertilizer, biostimulant data, and energy data are evaluated together, it’s concluded that it’s most appropriate to prefer the Cv microalgae strain.

Keywords

Microalgal biomass, Microalgal biochar, Pyrolysis, Biofertilizer, Biostimulant, Energy efficiency

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