The operational project for waste acid and wastewater treatment at the TIR smelter in Serbia covers an area of nearly 10,000 square meters and aims to efficiently treat various types of waste acid, wastewater, and industrial wastewater generated during the smelting process. The project has a designed daily treatment capacity of 800 m3 of smelting waste acid, 2000 m3 of industrial wastewater, 2000 m3 of terminal water treatment, and 240 m3 of domestic sewage. This project mainly treats heavy metal-containing acidic wastewater generated from the acid purification process, acidic and alkaline wastewater discharged from various production plants, and floor washing water. After pre-treatment at the waste acid and wastewater treatment station, the waste acid, together with other wastewater, undergoes deep purification at the wastewater treatment station. The terminal water treatment station focuses on treating pollutants contained in the smelter's rainwater collection system. It employs a dual-alkali softening process and combines it with the mixed reaction technology of polymeric ferric sulfate and heavy metal ions in the wastewater to ensure that the treated water quality meets the limit requirements of the "Serbian Non-Ferrous Metal Wastewater Discharge Standard." Ultimately, the treated water is recycled for reuse, effectively reducing environmental impact and promoting sustainable resource utilization.