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Production and Application of Microalgae Residue-Based Biochar for Soil Amendment

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Abstract:

This study investigates the production and application of biochar derived from Nannochloropsis gaditana residue for sustainable soil amendment. Pyrolysis conditions were optimized by varying temperature and residence time: 300°C for 30 minutes (Sample A), 500°C for 60 minutes (Sample B), and 700°C for 90 minutes (Sample C). Biochar characterization included SEM (morphology), FTIR (functional groups), pH analysis, and ICP-MS (trace elements). Sample B, produced at 500°C for 60 minutes, showed the most favorable properties; high porosity, balanced functional groups, and optimal alkalinity (pH 9.41). Sample C was highly porous and alkaline (pH 9.83) but lacked reactive groups, while Sample A retained labile nutrients with moderate porosity and pH (7.64). These results demonstrate the potential of microalgae-based biochar to improve nutrient-poor, acidic soils and support environmentally friendly alternatives to chemical fertilizers in Malaysia.

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Periodical:

Advances in Science and Technology (Volume 179)

Pages:

47-52

DOI:

https://doi.org/10.4028/p-STk8bu

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Online since:

June 2026

Authors:

Farah Aina Abdullah, Umi Fazara Md Ali*, Nor Ashikin Ahmad, Mohd Irfan Hatim Mohamed Dzahir, Nur Hidayah Azmi

Keywords:

Acidic Soil, Biochar, Microalgae Residue, Pyrolysis, Residence Time, Temperature

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© 2026 Trans Tech Publications Ltd. All Rights Reserved

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* - Corresponding Author

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