Abstract
The effect of macro- (NH4Cl) (set I) and micro-nutrients (Fe, Ni, Co and Mo) (set II) addition on chemical oxygen demand (COD) solubilisation during anaerobic mono-digestion of grass silage was investigated in two sets of leach bed reactor experiments at 35°C. Results showed that addition of NH4Cl and micro-nutrients improved COD solubilisation by 18% (0.56 g SCOD g−1 volatile solids) and 7% (0.45 g SCOD g−1 VS), respectively than control. About 20–50% of the added micro-nutrients were bioavailable in the produced leachates, while the rest (50–80%) were adsorbed onto the grass silage. Results of biological methane potential assays showed that, specific methane yields of grass silage were improved by 17% (0.36 ± 0.02 m3 CH4 kg−1 VSadded) when NH4Cl was supplemented while Fe, Ni, Co and Mo addition improved methane yields by 15% (0.33 ± 0.005 m3 CH4 kg−1 VSadded) when compared to control.
| Original language | English |
|---|---|
| Pages (from-to) | 418-429 |
| Number of pages | 12 |
| Journal | Environmental Technology |
| Volume | 40 |
| Issue number | 4 |
| DOIs | |
| Publication status | Published - 2019 |
| Publication type | A1 Journal article-refereed |
Keywords
- anaerobic digestion
- grass silage
- Leach bed reactor
- methane
- micro-nutrients
Publication forum classification
- Publication forum level 1
ASJC Scopus subject areas
- Environmental Chemistry
- Water Science and Technology
- Waste Management and Disposal
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Analytical Equipment of Bio and Circular Economy
Rintala, J. (Contact) & Maanoja, S. (Contact)
Materials Science and Environmental EngineeringFacility/equipment: Facility