Creation of an iron product for wastewater treatment
An embodiment provides A method for making a non-hazardous iron product for treating wastewater, including: adding sodium bisulfite to a solution comprising iron, creating an aqueous solution; adding an amount of sodium hydroxide to the aqueous solution to increase the pH of the aqueous solution to between 2-2.5; determining an amount of sodium bicarbonate and adding the identified amount of sodium bicarbonate to the aqueous solution, wherein the sodium bicarbonate adjusts the pH of the aqueous solution to a desired pH; and providing a buffer to the aqueous solution to generate a slurry. Other embodiments are described and claimed.
1. A method for making a non-hazardous iron product for treating wastewater, comprising:
combining sodium bisulfite with an aqueous solution comprising iron, thereby creating a mixed aqueous solution;
combining an amount of sodium hydroxide with the mixed aqueous solution to increase the pH of the mixed aqueous solution to between 2-2.5; and
combining an amount of a buffer with the mixed aqueous solution that adjusts the pH of the mixed aqueous solution to a desired pH to produce the non-hazardous iron product, the buffer being selected from the group consisting of sodium carbonate and sodium bicarbonate,
wherein the non-hazardous iron product is in the form of a slurry.
2. The method of claim 1 , wherein the aqueous solution comprising iron comprises iron chloride.
3. The method of claim 1 , wherein the aqueous solution comprising iron comprises iron sulfide.
4. The method of claim 1 , wherein the desired pH is between 4-5.
5. The method of claim 1 , wherein the buffer neutralizes at least some free acid in the mixed aqueous solution.
6. The method of claim 1 , wherein the aqueous solution comprising iron comprises an Fe(II) aqueous solution; and
further comprising aging the non-hazardous iron product prior to use.
7. The method of claim 1 , further comprising capturing off-gassed carbon dioxide using a caustic scrubber.
8. The method of claim 1 , further comprising adding, to the mixed aqueous solution, at least one additional agent from the group consisting of dispersants, anti-oxidants, and anti-clumping agents.
9. The method of claim 1 , further comprising measuring an infrared spectrum of the slurry.
10. A method for making a non-hazardous iron product for treating wastewater, comprising:
combining sodium bisulfite with an iron starting material aqueous solution, thereby creating a mixed aqueous solution;
combining a first component with the mixed aqueous solution that at least partially neutralizes free acid in the mixed aqueous solution and increases the pH of the mixed aqueous solution to a first pH; and
then combining a buffer with the mixed aqueous solution that further increases the pH of the mixed aqueous solution to a second pH that is between 4-5 to produce the non-hazardous iron product,
wherein the buffer is different from the first component, and the non-hazardous iron product is in the form of a slurry.
11. The method of claim 10 , wherein the iron starting material aqueous solution comprises iron chloride.
12. The method of claim 10 , wherein the iron starting material aqueous solution comprises iron sulfide.
13. The method of claim 10 , wherein the buffer is selected from the group consisting of: sodium carbonate and sodium bicarbonate.
14. The method of claim 13 , wherein the first component is an alkali.
15. The method of claim 14 , wherein the alkali is an alkali hydroxide.
16. The method of claim 10 , wherein the iron starting material aqueous solution comprises an Fe(II) aqueous solution; and
further comprising aging the non-hazardous iron product prior to use.
17. The method of claim 10 , further comprising capturing off-gassed carbon dioxide using a caustic scrubber.
18. The method of claim 10 , further comprising measuring an infrared spectrum of the slurry.
19. A method for making a non-hazardous iron product for treating wastewater, comprising:
combining sodium bisulfite with an iron starting material aqueous solution, thereby creating a mixed aqueous solution;
combining a first component with the mixed aqueous solution that at least partially neutralizes free acid in the mixed aqueous solution and increases the pH of the mixed aqueous solution to a first pH that is in a range of from 1.5-2.5; and
then combining a buffer with the mixed aqueous solution that further increases the pH of the mixed aqueous solution to a second pH to produce the non-hazardous iron product,
wherein the buffer is different from the first component, and the non-hazardous iron product is in the form of a slurry.