Back to Search
Start Over
Characterization of Anaerobic Degradability and Kinetics of Harvested Submerged Aquatic Weeds Used for Nutrient Phytoremediation.
- Source :
-
Energies (19961073) . 2015, Vol. 8 Issue 1, p304-318. 15p. 2 Charts, 3 Graphs. - Publication Year :
- 2015
-
Abstract
- In this study, eight different submerged aquatic species were screened by batch biochemical methane potential and anaerobic degradability tests to identify a promising/suitable feedstock. Kinetics of the best-screened substrate were studied in a mesophilic semi-continuous experiment. The aquatic species Myriophyllum aquaticum, Egeria densa and Potamogeton perfoliatus showed relatively higher methane yields of over 400 NmL/g-VS (volatile solids). Semi-continuous operation was carried out by feeding E. densa for over 400 days. The achieved results were 33%-53% chemical oxygen demand (COD) reduction and methane yield of 126-231 NmL/g-VS with a short hydraulic retention time (HRT). Additionally, the NH4+ and PO43- releases from the biomass to water were found to be low (18%-27% and 2.5%-3.9%) throughout the experiment. Hydrolysis was the limiting step in the digestion of E. densa, regardless of changes in HRT (15-45 days). The acid-phase model indicated that the hydrolysis rate constant (kh) of E. densa was 0.058 one/day, which was one third lower the kh value of food waste, but quite similar to cow manure. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 19961073
- Volume :
- 8
- Issue :
- 1
- Database :
- Academic Search Index
- Journal :
- Energies (19961073)
- Publication Type :
- Academic Journal
- Accession number :
- 100595460
- Full Text :
- https://doi.org/10.3390/en8010304