On March 10, 2025, a Chinese lead smelter achieved zero sludge discharge in thallium-containing wastewater treatment through advanced ion exchange resin technology. By integrating oxidation-precipitation and resin adsorption, the process achieved 98% thallium recovery and eliminated sludge disposal costs, reducing chemical consumption by 30%. This innovation sets a benchmark for heavy metal pollution control and accelerates green smelting under China's dual carbon strategy.