Abstract
The continuously increasing demand for renewable energy sources renders anaerobic
digestion to one of the most promising technologies for renewable energy production. Due to
the animal production intensification, manure is being used as the primary feedstock for most
of the biogas plants. Thus, their economical profitable operation relies on increasing the
methane yield from manure, and especially of its solid fraction which is not so easily
degradable. In the present study, Aqueous Ammonia Soaking was successfully applied on
digested fibers separated from the effluent of a manure-fed, full-scale anaerobic digester to
enhance their methane productivity. Soaking in six different reagent concentrations in
ammonia (5%, 10%, 15%, 20%, 25%, 32%) was applied for 3 days at 22°C. An overall
methane yield increase from 85% to 110% was achieved compared to controls (digested
manure fibers where AAS was not applied). The difference in reagent concentration at the
range of 5-25% w/w in ammonia did not affect that much the overall methane yield resulting
to an increase of 104-110% compared to the non AAS-treated fibers. Thus, an ammonia
concentration as low as 5% is adequate for achieving the same increase in methane yield as
the highest concentrations tested; it is anticipated that this will result to an even lower cost for
recovery and recycling of ammonia in full-scale. Moreover, the effect of 1, 3, and 5 days AAS
treatment on methane production from digested fibers was investigated with 5 and 25% w/w
reagent concentrations in ammonia. It was shown that the optimal duration among the ones
tested was the three days for both reagent concentrations.
digestion to one of the most promising technologies for renewable energy production. Due to
the animal production intensification, manure is being used as the primary feedstock for most
of the biogas plants. Thus, their economical profitable operation relies on increasing the
methane yield from manure, and especially of its solid fraction which is not so easily
degradable. In the present study, Aqueous Ammonia Soaking was successfully applied on
digested fibers separated from the effluent of a manure-fed, full-scale anaerobic digester to
enhance their methane productivity. Soaking in six different reagent concentrations in
ammonia (5%, 10%, 15%, 20%, 25%, 32%) was applied for 3 days at 22°C. An overall
methane yield increase from 85% to 110% was achieved compared to controls (digested
manure fibers where AAS was not applied). The difference in reagent concentration at the
range of 5-25% w/w in ammonia did not affect that much the overall methane yield resulting
to an increase of 104-110% compared to the non AAS-treated fibers. Thus, an ammonia
concentration as low as 5% is adequate for achieving the same increase in methane yield as
the highest concentrations tested; it is anticipated that this will result to an even lower cost for
recovery and recycling of ammonia in full-scale. Moreover, the effect of 1, 3, and 5 days AAS
treatment on methane production from digested fibers was investigated with 5 and 25% w/w
reagent concentrations in ammonia. It was shown that the optimal duration among the ones
tested was the three days for both reagent concentrations.
| Originalsprog | Engelsk |
|---|---|
| Titel | Proceedings of the 4th International Conference on Engineering for Waste and Biomass Valorisation (WasteEng12), Porto (Portugal), September 10-13 |
| Antal sider | 6 |
| Vol/bind | 1 |
| Forlag | WasteEng Conference Series, Mines d’Albi, France |
| Publikationsdato | 2012 |
| Sider | 282-287 |
| ISBN (Elektronisk) | 979-10-91526-00-5 |
| Status | Udgivet - 2012 |
| Begivenhed | 4th International Conference on Engineering for Waste and Biomass Valorisation - Porto, Portugal Varighed: 10 sep. 2012 → 13 sep. 2012 Konferencens nummer: 4 |
Konference
| Konference | 4th International Conference on Engineering for Waste and Biomass Valorisation |
|---|---|
| Nummer | 4 |
| Land/Område | Portugal |
| By | Porto |
| Periode | 10/09/2012 → 13/09/2012 |