Wastewater Neutralization

Using the concentration of the alkaline species present and the stream flowrate, do a mass balance on the sulphuric acid addition process until all the alkaline species is converted to its sulphate.

Check the discharge consent conditions imposed by the local environmental authority. Discharge consents are usually in a band. So if the consent is pH 6-10, for example, then the economic setpoint for discharge is pH 10, though it may prove wise to operate a little under that figure.

Is this batch or continuous feed?

the OH concentration at pH 13 is 10^-13 molar

at pH 9 is will be 10^-9 molar

the difference (approx 10^-9M) is the amount of equivalents of acid you need to add

sulfuric acid provides 2 equivalnmts per mole and is 96% pure as bought and used

use the MW of sulfuric and the volume of water to be treated to complete the estimate

this is only a rough estimate - you really need to do a titration curve with your wastewater

Steve