Here I am citing studies that have shown to be effective and prooven alternatives applicable on a larger scale:

Drinking Water Solutions:

"Invention produces cleaner water with less energy and no filter. Through the use of CO2"

(https://www.princeton.edu/news/2017/05/08/invention-produces-cleaner-water-less-energy-and-no-filter) - Princeton University, by John Sullivan, Office of Engineering Communications,

LINK TO STUDY:

CO2 (Solutions), what to do with "waste" 

"Startup born in Princeton lab turns carbon dioxide into fuels"

RE-VALUE, RE-USE, RE-CYCLE

"The technology behind the process is simple: Take CO2 and mix it in a water-filled chamber with an electrode and a catalyst. The ensuing chemical reaction converts CO2 into a new molecule, methanol, which can be used as a fuel, an industrial solvent or a starting material for the manufacture of other chemicals." - a little excerpt from the study

(https://www.princeton.edu/news/2012/06/14/startup-born-princeton-lab-turns-carbon-dioxide-fuels) - Princeton Universtiy, by Catherine Zandonella, published in Journal of the American Chemical Society.

LINK TO STUDY: