Aqueous leaching of organic acids and dissolved organic carbon from various biochars prepared at different temperatures
| Autor: | Richard C. Landis, William R. Berti, Peng Liu, David W. Blowes, Carol J. Ptacek |
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| Rok vydání: | 2015 |
| Předmět: |
Environmental Engineering
Chemistry Inorganic chemistry Alkalinity 04 agricultural and veterinary sciences 010501 environmental sciences Management Monitoring Policy and Law 01 natural sciences Pollution Manure 6. Clean water Soil conditioner visual_art Environmental chemistry Biochar Dissolved organic carbon 040103 agronomy & agriculture visual_art.visual_art_medium 0401 agriculture forestry and fisheries Leaching (agriculture) Charcoal Waste Management and Disposal Pyrolysis 0105 earth and related environmental sciences Water Science and Technology |
| Zdroj: | Journal of environmental quality. 44(2) |
| ISSN: | 0047-2425 |
| Popis: | Biochar has been used as a soil amendment, as a water treatment material, and for carbon (C) sequestration. Thirty-six biochars, produced from wood, agricultural residue, and manure feedstocks at different temperatures, were evaluated for the aqueous leaching of different forms of soluble C. The release of inorganic C (alkalinity), organic acids (OAs), and total dissolved organic C (DOC) was highly variable and dependent on the feedstock and pyrolysis temperature. The pH and alkalinity increased for the majority of samples. Higher pH values were associated with high-temperature (high-T) (600 and 700°C) biochars. Statistically significant differences in alkalinity were not observed between low-temperature (low-T) (300°C) and high-T biochars, whereas alkalinity released from wood-based biochar was significantly lower than from others. Concentrations of OAs and DOC released from low-T biochars were greater than from high-T biochars. The C in the OAs represented 1 to 60% of the total DOC released, indicating the presence of other DOC forms. The C released as DOC represented up to 3% (majority |
| Databáze: | OpenAIRE |
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