Effective Remediation\nStrategy for Acidic Wastewater:\nIntegrating Ozone Nanobubbles with Sustainable Adsorption Techniques

Amidst the powerful capabilities of wastewater remediation\nusing\nozone nanobubbles (ONBs), the intricate challenge of pH control remains\nunsolved. To date, an efficient and scalable chemical agent is highly\ndesired to overcome the limiting factor of conventional ozone-based\nwastewater conversion. This study introduces a sequential system that\ncombines ONBs with adsorption techniques utilizing an eggshell-based\nadsorbent. The synergistic application of ONBs and adsorption successfully\nachieved notable removal percentages of 95.05% for turbidity, 96.18%\nfor color at 418 nm, and 61.33% for TDS. In comparison, the individual\nONB system showed removal percentages of 94.97%, 95.93%, and 61.97%,\nwhile the adsorption alone achieved 34.02, 29.65%, and 16.93%, respectively.\nAdditionally, the combined system effectively neutralized the solution,\nincreasing the pH from 2.67 to 7.14, outperforming both ONBs (pH 2.67)\nand adsorption (pH 6.89) alone. Our work underscores the efficiency\nof the system, which not only provides a high removal percentage of\npollutants but also secures the required pH levels. This showcases\na forward leap in developing environmentally friendly and efficient\nwater treatment technologies.