Resumen
The improper disposal of organic wastes is an environmental problem. An alternative to this problems is to use the combined anaerobic digestion (co-AD), in which organic matter is degraded by microorganisms to produce biogas and digestate, which can be used as fertilizer. Digestate comprises a liquid fraction (biol) and a solid one. In this work the phytotoxicity of bioles obtained from different conditions of co-AD was evaluated. Four batch type biodigesters tratments and a control were prepared, all at 70% capacity, 10% solids dry basis, retention time of 60 days and mesophilic temperature conditions. The treatments consisted in 80% residue of vegetables and 20% pig manure, a group of digesters was adjusted to initial pH 6 and another initial pH 8, and with or without adjusting the Carbon:Nitrogen ratio to 20:1. PH was monitored during the process. Phytotoxicity test was done through germination index (GI). GI was calculated to the bioles of weeks 3, 6 and 8 of the process of co-DA. Six bioles obtained in different weeks were not phytotoxic, the bioles obtained from co-DA where the initial pH was adjusted to 8 were growth promoters in week 6; however, the control obtained higher GI than the treatments.
Título traducido de la contribución | Phytotoxic evaluation of liquid digestates obtained from anaerobic co-digestion of agricultural and livestock waste |
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Idioma original | Español |
Páginas (desde-hasta) | 1-7 |
Número de páginas | 7 |
Publicación | Mexican Journal of Biotechnology |
Volumen | 1 |
N.º | 2 |
DOI | |
Estado | Publicada - 1 dic. 2016 |
Palabras clave
- Agricultural residues
- Anaerobic co-digestion
- Germination index
- Liquid digestate
- Phytotoxicity