How to dispose sulfuric acid?

2NaOH + H2SO4 --> Na2SO4 + 2H2O

This is a base trap. This reaction with this base ( need not be too concentrated of base, though sodium hydroxide is a strong base ) yields a salt, sodium sulfate and water.

CaCO3 + H2SO4 --> CaSO4 + CO2 + H2O

A safer trap with calcium carbonate that yields A salt, calcium sulfate, CO2 gas (carbon dioxide) and water.

These are standard ways to render sulfuric acid safe.  At schools and businesses.An actual mechanism for the reaction to take place ( for larger amounts of acid ) or this can be dome in a large enough beaker.