Synthetic sewage (OECD guideline):
- peptone water 160 mg/L
- meat extract 110 mg/L
- urea 30 mg/L
- anhydrous potassium monohdydrogen phosphate 28 mg/L
- sodium chloride 7 mg/L
- calcium chloride dihydrate 4 mg/L
- magnesium sulphate heptahydrate 2 mg/L
I just used tap water with alkalinity of around 250 mgHCO3-/l and this was sufficient to obtain a pH around neutrality.
it also depend on the wastewater treatment process, if you use the A/O, less alkalinity will be needed
If you want to achieve full nitrification, you should ensure sufficient alkalinity, according to the stoichiometry of nitrification, that is 2 moles Alk per mole of oxidized nitrogen + a surplus of 10% to account for casual variations in the feed composition. If you perform nitrification and denitrification, the process will require less alkalinity because the denitrification process produces about 1 moles Alk per mole of nitrate reduced to gaseous nitrogen.
Thank you very much for your valuable suggestions
Special thanks to Prof. Canziani for his deeper thought
Kind regards
Petros
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