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Table 1

Data and simulation results of Lander Street primary digester, and two scenarios of iron dose for hydrogen sulfide and struvite control

DataModel
Parameterwithout ironwith iron for H2S controlwith iron for struvite control
Iron dose, g FeCl3/kg VSS  25 100 
Influent total nitrogen, kg/d 306 308 
Influent total phosphorus, kg/d 90 89 
Influent total sulfur, kg/d 23 27 
Influent Ca, kg/d 127 128 
Influent Mg, kg/d 17 17 
Influent total solids 4.0% 4.0% 
Influent VSS, % of total solids 84% 85% 
Digester total solids 1.70% 2.10% 2.15% 2.24% 
Digester VSS, % of total solids 67% 66% 65% 62% 
Digester pH 7.15 7.16 7.07 6.80 
Alkalinity as CaCO3, mg/L 4,100 3,544 2,939 1,762 
Gas production, Nm3/h 176 172 174 178 
Digester gas H2S, ppm 2,125 1,926 141 4 
Digester ammonia, mg N/L 1,169 979 978 1,018 
Digester phosphate, mg P/L 156 166 113 
Struvite, mg TSS/L ? 842 827 37 
Vivianite, mg TSS/L  578 2,488 
Iron sulfide, mg TSS/L  146 163 
Elemental sulfur, mg S/L  
Amorphous calcium phosphate, mg TSS/L  300 186 
DataModel
Parameterwithout ironwith iron for H2S controlwith iron for struvite control
Iron dose, g FeCl3/kg VSS  25 100 
Influent total nitrogen, kg/d 306 308 
Influent total phosphorus, kg/d 90 89 
Influent total sulfur, kg/d 23 27 
Influent Ca, kg/d 127 128 
Influent Mg, kg/d 17 17 
Influent total solids 4.0% 4.0% 
Influent VSS, % of total solids 84% 85% 
Digester total solids 1.70% 2.10% 2.15% 2.24% 
Digester VSS, % of total solids 67% 66% 65% 62% 
Digester pH 7.15 7.16 7.07 6.80 
Alkalinity as CaCO3, mg/L 4,100 3,544 2,939 1,762 
Gas production, Nm3/h 176 172 174 178 
Digester gas H2S, ppm 2,125 1,926 141 4 
Digester ammonia, mg N/L 1,169 979 978 1,018 
Digester phosphate, mg P/L 156 166 113 
Struvite, mg TSS/L ? 842 827 37 
Vivianite, mg TSS/L  578 2,488 
Iron sulfide, mg TSS/L  146 163 
Elemental sulfur, mg S/L  
Amorphous calcium phosphate, mg TSS/L  300 186 

VSS: volatile suspended solids; TSS: total suspended solids.

Bold text refers to parameters controlled with iron dosing.

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