The effect of magnesium as activator and inhibitor of anaerobic digestion
| Autor: | M.S. Romero-Güiza, J. Mata-Alvarez, Josep Maria Chimenos, Sergi Astals |
|---|---|
| Rok vydání: | 2016 |
| Předmět: |
inorganic chemicals
020209 energy chemistry.chemical_element Stimulation 02 engineering and technology 010501 environmental sciences 01 natural sciences Methane chemistry.chemical_compound Bioreactors 0202 electrical engineering electronic engineering information engineering Magnesium Anaerobiosis Methane production Waste Management and Disposal 0105 earth and related environmental sciences Models Theoretical Manure Anaerobic digestion chemistry Biochemistry Reagent Biofuels Toxicity Nuclear chemistry |
| Zdroj: | Waste management (New York, N.Y.). 56 |
| ISSN: | 1879-2456 |
| Popis: | Anaerobic digestion stands as a key technology in the emerging green energy economy. Mg(2+) has been identified as an important element to improve digesters methane production; however the inhibition risk that high Mg(2+) concentrations can cause to the AD process must also be considered when dosing Mg reagents and wastes containing Mg(2+). Despite its importance, Mg(2+) stimulation and inhibition mechanisms as well as threshold values are scarce in the literature. This research paper investigates the impact (stimulation and inhibition) of Mg(2+) on pig manure anaerobic digestion. Mathematical modelling was used to better understand the interaction between substrate, inoculum and magnesium, where Mg(2+) inhibition was modelled by a n-component non-competitive inhibition function. Modelling was done on absolute curves rather than specific methane productions curves (new approach) to account for the lower background methane production of the inoculum as the Mg(2+) concentration increased. Results showed that no stimulation or inhibition occurred between 40 (native concentration) and 400mgMg(2+)L(-1), while minor and major inhibition were observed at 750 and 1000mgMg(2+)L(-1), and at 2000 and 4000mgMg(2+)L(-1), respectively. Mg(2+) half maximal inhibition concentration was estimated at 2140mgMg(2+)L(-1) with an inhibition order of 2. The latter indicates that Mg(2+) inhibition is a progressive rather than a steep inhibition mechanism. |
| Databáze: | OpenAIRE |
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