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Bioavailability and dosing strategies of mineral in anaerobic mono‐digestion of maize straw |
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| Authors: | Aimee González‐Suárez Ileana Pereda‐Reyes Deny Oliva‐Merencio Teresa Suárez‐Quiñones Ariovaldo José da Silva Marcelo Zaiat |
| Affiliation: | 1. Study Center for Process Engineering (CIPRO), Universidad Tecnológica de La Habana “José Antonio Echeverría” (Cujae), Marianao, Havana, Cuba;2. Study Center for Renewable Energy Technology (CETER), Universidad Tecnológica de La Habana “José Antonio Echeverría” (Cujae), Marianao, Havana, Cuba;3. Leibniz Institute for Agricultural Engineering Potsdam‐Bornim, Potsdam, Germany;4. School of Agricultural Engineering (FEAGRI), University of Campinas, Campinas, SP, Brazil;5. Biological Processes Laboratory, Center for Research, Development and Innovation in Environmental Engineering, S?o Carlos School of Engineering (EESC), University of S?o Paulo, S?o Carlos, SP, Brazil |
| Abstract: | The influence of the bonding form distribution of Fe, Ni, Co and Mn and their potential bioavailability during the anaerobic degradation of maize straw was investigated. Two reactors were operated over 117 days at 37°C and different dosage strategies of mineral were studied in reactor (R2). Control reactor (R1) was metal‐limited over time. mineral supplementation (1 g L?1) once a week reported the highest methane yield (257 mL g?1 VS) with 30% of increment. Ni and Co predominated in their oxidizable bonding forms and Fe mainly existed as residual and oxidizable fractions. The potential bioavailability (Mn ?? Co ≈ Ni ? Fe) of R2 was higher comparing to R1. Metal deprivation in R1 led to depletion of both sequential extraction fractions and total metal concentrations until the end of the process. This study confirmed that the dosage strategy of mineral has a stimulatory effect on methane production from crop maize waste. |
| Keywords: | Anaerobic degradation Methane yield Mineral supplementation Potential bioavailability Speciation |