Sodium bicarbonate reacts with aluminum sulfate to produce sodium sulfate, aluminum hydroxide and carbon dioxide. The product of this reaction is a foam stabilizer and can be used to put out a fire.

Al2(SO4)3 + 6 NaHCO3 → 3 Na2SO4 + 2 Al(OH)3 + 6 CO2

Aluminum hydroxide reacts with sulfuric acid to produce aluminum sulfate and water. An environmental implication of this reaction is the change in pH of the surrounding watercourses. 

2 Al(OH)3 + 3 H2SO4 → Al2(SO4)3 + 6 H2O