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Table 3

Classification of gases based on their order of importance

GasHenry's law constant [mol/(m3·Pa)]Solubility in water*Importance
O2 1.2 × 10−5 Low Process performance and energy, i.e. effluent quality and costs 
CO2 3.3 × 10−4 Low pH calculations; GHG emissions 
NO
N2
1.9 × 10−5
2.4 × 10−4 
Low
Low 
GHG emissions 
H21.0 × 10−3 Intermediate Corrosion, odour nuisance and inhibition effect on the anaerobic digestion 
NH3 5.9 × 10−1 High Odour nuisance and inhibition effect on the anaerobic digestion, resource recovery 
CH4
H2 
1.4 × 10−5
2.6 × 10−6 
Low
Low 
GHG emissions
Inhibition effect on the anaerobic digestion 
Volatile organic compounds – – Health effect and odour nuisance 
N2 6.4 × 10−6 Low Present in air, makes up bubble volume in anoxic zones, mitigation of GHG emissions 
GasHenry's law constant [mol/(m3·Pa)]Solubility in water*Importance
O2 1.2 × 10−5 Low Process performance and energy, i.e. effluent quality and costs 
CO2 3.3 × 10−4 Low pH calculations; GHG emissions 
NO
N2
1.9 × 10−5
2.4 × 10−4 
Low
Low 
GHG emissions 
H21.0 × 10−3 Intermediate Corrosion, odour nuisance and inhibition effect on the anaerobic digestion 
NH3 5.9 × 10−1 High Odour nuisance and inhibition effect on the anaerobic digestion, resource recovery 
CH4
H2 
1.4 × 10−5
2.6 × 10−6 
Low
Low 
GHG emissions
Inhibition effect on the anaerobic digestion 
Volatile organic compounds – – Health effect and odour nuisance 
N2 6.4 × 10−6 Low Present in air, makes up bubble volume in anoxic zones, mitigation of GHG emissions 

*Sander (2015).

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