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Table 2

Effects of adding reject water on effluent characteristics (measurements and multi-scale ADM1 model simulations)

#D1 (no reject water)
#D2 (reject water is added)
MeasurementsDeviation (%)R2MeasurementsDeviation (%)R2
CH4 (gas) (Nm3.d−111,015 4.5 >0.7 12,059 14.3 0.5–0.7 
CO2 (gas) (Nm3.d−12,922 1.7 >0.7 3157 4.8 0.5–0.7 
H2S (gas) (Nm3.d−1178 25.5 >0.7 206 12.7 0.5–0.7 
NHX (g N.m−3299 1.2 0.5–0.7 426 3.3 <0.5 
HXPO4X−3 (g P.m−344 25.17 >0.7 14 3.2 >0.7 
SOX2- (g S.m−397 14.6 <0.5 111 10.6 <0.5 
VFA (kg COD.m−30.79 19.3 0.5–0.7 0.41 21.7 <0.5 
CODsol (kg COD.m−31.73 18.2 >0.7 1.07 0.22 <0.5 
CODpart (kg COD.m−31.15 6.2 <0.5 3.06 6.18 <0.5 
Ca (g.m−3332 3.6 0.5–0.7 520 24.42 <0.5 
Mg (g.m−329 1.76 <0.5 26 9.5 <0.5 
Average  10.2   10.1  
#D1 (no reject water)
#D2 (reject water is added)
MeasurementsDeviation (%)R2MeasurementsDeviation (%)R2
CH4 (gas) (Nm3.d−111,015 4.5 >0.7 12,059 14.3 0.5–0.7 
CO2 (gas) (Nm3.d−12,922 1.7 >0.7 3157 4.8 0.5–0.7 
H2S (gas) (Nm3.d−1178 25.5 >0.7 206 12.7 0.5–0.7 
NHX (g N.m−3299 1.2 0.5–0.7 426 3.3 <0.5 
HXPO4X−3 (g P.m−344 25.17 >0.7 14 3.2 >0.7 
SOX2- (g S.m−397 14.6 <0.5 111 10.6 <0.5 
VFA (kg COD.m−30.79 19.3 0.5–0.7 0.41 21.7 <0.5 
CODsol (kg COD.m−31.73 18.2 >0.7 1.07 0.22 <0.5 
CODpart (kg COD.m−31.15 6.2 <0.5 3.06 6.18 <0.5 
Ca (g.m−3332 3.6 0.5–0.7 520 24.42 <0.5 
Mg (g.m−329 1.76 <0.5 26 9.5 <0.5 
Average  10.2   10.1  

Simulation scenarios are S1 and S3.

Deviation (%) and R2 are calculated between simulation values and plant measurements.

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