Simple processing technology of leaching water using CO2 microbubbles

The effectiveness of CO2 microsize bubbles for removal of Ca2 + ions in the leaching water discharged from the final landfill site was evaluated using imitation water. For the important parameter in the Ca2 + ion removal, it was found that the treatment in alkaline region above pH = 10 was optimum. The possibility of using CO2 microbubbles was examined by substitution of chemical Na2CO3, which is used in large quantities today. In addition, the excellence of CO2 microbubbles was demonstrated by comparing with CO2 millimeter size bubbles.

Graphical abstractThe Ca2 + ions from leaching water form scale in the drainage pipe, causing the blockage of the pipe. Today, the removal of Ca2 + ions is performed before discharge by using a lot of sodium carbonate (Na2CO3). The amount of Na2CO3 consumed in one year is not less than 200 tons for a final landfill site. Therefore, reducing the amount of chemical used is strongly required from the financial side. In this study, it was demonstrated that the CO2 microbubble method is promising as a new Ca2 + removal technology instead of using chemical, Na2CO3.Figure optionsDownload full-size imageDownload as PowerPoint slide