Abstract
Algae as a substrate for biogas is superior to other crops since it has a much
higher yield of biomass per unit area and since algae grows in the seawater
there will be no competition with food production on agricultural lands. So
far, the progress in treating different groups of algae as a source of energy
is promising. In this study 5 different algae types were tested for biogas
potential and two algae were subsequent used for co-digestion with manure.
Green seaweed, Ulva lactuca and brown seaweed Laminaria digitata was
co-digested with cattle manure at mesophilic and thermophilic condition. The
results show that the methane yield of Laminaria from mesophilic anaerobic
digestion was fairly stable (average 138 L CH4/kgVSadded).
Methane generation from thermophilic reactors both for Ulva and Laminaria,
on the other hand, varied significantly, as the feeding rate varied. While the
thermophilic treatment of Laminaria produced an average of 142 L CH4/kgVS,
Ulva yielded around 122 L/kgVS. Overall, it was found that algae are promising
substrates for co-digestion with cattle manure and besides producing
energy algae can remove substantial amounts of nutrients from the water
environment that subsequent can be used for fertilizer in organic farming. In
the study the digested fertilizer product has been evaluated and it has a high
quality in terms of nutrients.
higher yield of biomass per unit area and since algae grows in the seawater
there will be no competition with food production on agricultural lands. So
far, the progress in treating different groups of algae as a source of energy
is promising. In this study 5 different algae types were tested for biogas
potential and two algae were subsequent used for co-digestion with manure.
Green seaweed, Ulva lactuca and brown seaweed Laminaria digitata was
co-digested with cattle manure at mesophilic and thermophilic condition. The
results show that the methane yield of Laminaria from mesophilic anaerobic
digestion was fairly stable (average 138 L CH4/kgVSadded).
Methane generation from thermophilic reactors both for Ulva and Laminaria,
on the other hand, varied significantly, as the feeding rate varied. While the
thermophilic treatment of Laminaria produced an average of 142 L CH4/kgVS,
Ulva yielded around 122 L/kgVS. Overall, it was found that algae are promising
substrates for co-digestion with cattle manure and besides producing
energy algae can remove substantial amounts of nutrients from the water
environment that subsequent can be used for fertilizer in organic farming. In
the study the digested fertilizer product has been evaluated and it has a high
quality in terms of nutrients.
| Original language | English |
|---|---|
| Publication date | 24 Apr 2012 |
| Number of pages | 1 |
| Publication status | Published - 24 Apr 2012 |
| Event | Nordic Biogas Conference - Bella Center, København, Denmark Duration: 23 Apr 2012 → 25 Apr 2012 Conference number: 4 |
Conference
| Conference | Nordic Biogas Conference |
|---|---|
| Number | 4 |
| Location | Bella Center |
| Country/Territory | Denmark |
| City | København |
| Period | 23/04/2012 → 25/04/2012 |