Abstract
Substrates that contain high ammonia levels can cause inhibition on anaerobic digestion process and unstable biogas production. The aim of the current study was to assess the effects of different ammonia levels on pure strains of (syntrophic acetate oxidizing) SAO bacteria and hydrogenotrophic methanogens. Two pure strains of hydrogenotrophic methanogens (i.e: Methanoculleus bourgensis and Methanoculleus thermophiles) and two pure strains of SAO bacteria (i.e: Tepidanaerobacter acetatoxydans and Thermacetogenium phaeum) were inoculated under four different ammonia (0.26, 3, 5 and 7g NH4+-N/L) and free ammonia levels (Mesophilic: 3.31, 38.2, 63.68 and 89.15 g NH3-N/L. Thermophilic: 8.48, 97.82, 163.03 and 228.24 g NH3-N/L). The results indicated that both T. acetatoxydans and T. phaeum were more sensitive to high ammonia levels compared to the hydrogenotrophic methanogens tested. Additionally, the total incubation periods of hydrogenotrophic methanogens were significantly shorter compared to the SAO bacteria incubation periods. Thus, it seems that hydrogenotrophic methanogens could be equally, if not more, tolerant to high ammonia levels compared to SAO bacteria.
| Original language | English |
|---|---|
| Publication date | 2015 |
| Number of pages | 4 |
| Publication status | Published - 2015 |
| Event | 14th World Congress of Anaerobic Digestion - , Chile Duration: 14 Nov 2015 → 18 Nov 2015 Conference number: 14 |
Conference
| Conference | 14th World Congress of Anaerobic Digestion |
|---|---|
| Number | 14 |
| Country/Territory | Chile |
| Period | 14/11/2015 → 18/11/2015 |
Keywords
- Ammonia inhibition
- Anaerobic digestion
- Biogas Hydrogenotrophic methanogens
- SAO bacteria