DOI: 10.1007/s00253-011-3625-4 (2011)
Abstract
Ammonia increases buffer capacity of methanogenic medium in mesophilic anaerobic reactor thus increasing the stability of anaerobic digestion process. Optimal
ammonia concentration ensures sufficient buffer capacity
while not inhibiting the process. It was found out in this
paper that this optimum depends on the quality of anaerobic
sludge under investigation. The optimal concentrations for
methanogens were 2.1, 2.6 and 3.1 g/L of ammonia
nitrogen in dependence on inoculum origin. High ammonia
nitrogen concentration (4.0 g/L) inhibited methane production, while low ammonia nitrogen concentration (0.5 g/L)
caused low methane yield, loss of biomass (as VSS) and
loss of the aceticlastic methanogenic activity. It was found
out that negative effect of low ammonia nitrogen concentration on biomass is caused not only by low buffer
capacity but also by insufficiency of nitrogen as nutrient.
It was also found out that anaerobic sludge with higher
ammonia nitrogen concentration (4.2 g/L) tolerates even
concentration of volatile fatty acids (160 mmol/L) which
causes inhibition of the process with low ammonia nitrogen
concentration (0.2 g/L).
Ammonia increases buffer capacity of methanogenic medium in mesophilic anaerobic reactor thus increasing the stability of anaerobic digestion process. Optimal
ammonia concentration ensures sufficient buffer capacity
while not inhibiting the process. It was found out in this
paper that this optimum depends on the quality of anaerobic
sludge under investigation. The optimal concentrations for
methanogens were 2.1, 2.6 and 3.1 g/L of ammonia
nitrogen in dependence on inoculum origin. High ammonia
nitrogen concentration (4.0 g/L) inhibited methane production, while low ammonia nitrogen concentration (0.5 g/L)
caused low methane yield, loss of biomass (as VSS) and
loss of the aceticlastic methanogenic activity. It was found
out that negative effect of low ammonia nitrogen concentration on biomass is caused not only by low buffer
capacity but also by insufficiency of nitrogen as nutrient.
It was also found out that anaerobic sludge with higher
ammonia nitrogen concentration (4.2 g/L) tolerates even
concentration of volatile fatty acids (160 mmol/L) which
causes inhibition of the process with low ammonia nitrogen
concentration (0.2 g/L).
ammonia concentration ensures sufficient buffer capacity
while not inhibiting the process. It was found out in this
paper that this optimum depends on the quality of anaerobic
sludge under investigation. The optimal concentrations for
methanogens were 2.1, 2.6 and 3.1 g/L of ammonia
nitrogen in dependence on inoculum origin. High ammonia
nitrogen concentration (4.0 g/L) inhibited methane production, while low ammonia nitrogen concentration (0.5 g/L)
caused low methane yield, loss of biomass (as VSS) and
loss of the aceticlastic methanogenic activity. It was found
out that negative effect of low ammonia nitrogen concentration on biomass is caused not only by low buffer
capacity but also by insufficiency of nitrogen as nutrient.
It was also found out that anaerobic sludge with higher
ammonia nitrogen concentration (4.2 g/L) tolerates even
concentration of volatile fatty acids (160 mmol/L) which
causes inhibition of the process with low ammonia nitrogen
concentration (0.2 g/L).
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