Hydrogen gas production system utilizing silicon wastewater and method for production of hydrogen energy using the same

Abstract

Disclosed is a method for production of hydrogen energy utilizing silicon wastewater. The method includes treating the silicon wastewater through UF membrane filtration to separate UF treated water and a concentrated silicon waste solution therefrom, admixing the separated silicon waste solution with an alkaline material, reacting the concentrated silicon waste solution with the alkaline material in the mixture to produce hydrogen gas and alkaline water, using an acidic material to neutralize the alkaline water, thereby forming a supernatant and a precipitate.

What is claimed is: 
     
         1 . A method for production of hydrogen energy utilizing silicon wastewater, comprising:
 treating the silicon wastewater through ultrafiltration (“UF”) membrane filtration to separate UF treated water and a concentrated silicon waste solution therefrom;   admixing the separated silicon waste solution with an alkaline material;   reacting the concentrated silicon waste solution with the alkaline material in the mixture to produce hydrogen gas and alkaline water; and   using an acidic material to neutralize the alkaline water, thereby forming a supernatant and a precipitate.   
     
     
         2 . The method according to  claim 1 , further comprising: discarding solids obtained by dehydration of the precipitate. 
     
     
         3 . The method according to  claim 1 , wherein the alkaline material is at least one selected from a group consisting of NaOH, KOH, MgOH, CaOH 2 , FeOH 2 , NH 4 OH, Na 2 CO 3 , NaBH 4  and mixtures thereof. 
     
     
         4 . The method according to  claim 1 , wherein the alkaline water has a pH range of 12 to 13. 
     
     
         5 . The method according to  claim 1 , wherein the acidic material is at least one selected from a group consisting of HCl, HNO 3  and a mixture thereof. 
     
     
         6 . The method according to  claim 1 , wherein neutralization is performed to adjust the pH of the alkaline solution to 7 to 10.