Hello Everyone,
I would like to know how to calculate the amount of adding MgO in a struvite precipitation reactor.
Thank you very much
Magnesium oxide (MgO) is commonly used to control the pH and promote struvite precipitation in wastewater treatment systems. The amount of MgO needed to be added to a struvite precipitation reactor can be calculated using the following formula:
MgO (g) = (mg/L of Mg) x (volume of wastewater (L)) / 40
Where mg/L of Mg is the concentration of magnesium ions in the wastewater and 40 is the molecular weight of MgO.
For example, if the magnesium concentration in the wastewater is 10 mg/L and the reactor volume is 1000 L, the amount of MgO needed to be added to the reactor would be:
MgO (g) = (10 mg/L) x (1000 L) / 40 = 250 g
It's important to note that the amount of MgO needed to be added will also depend on the pH of the wastewater and the desired pH for struvite precipitation. In general, a pH range of 8.5 - 9.5 is optimal for struvite precipitation, so the pH of the wastewater should be adjusted to this range before adding the MgO.
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