With the continuous improvement and economic development of China’s coal mining industry, research on the characteristics of wastewater discharge has gained attraction in recent years. Ballasted flocculation technology, has been widely used in recent years. However, its effect on the settling velocity of the flocs in wastewater has not been quantified. This study aimed to screen optimal reaction condition for ballasted flocculation and to derive the settling velocity of the ballasted flocs under these conditions. The results showed that, the size of the ballasted material had no significant effect on the turbidity and suspended solids removal rate; however, the settling time was effectively shortened, and the turbidity removal rate could reach more than 95% within 15 s. Owing to the optimization of the reaction conditions, 90% of the flocs sizes were distributed in the 80-200μm range. Moreover, the difference between the theoretical and the measured value of the ballasted flocculation was small, indicating that the derived formula could effectively quantify the settling velocity of the ballasted flocs under optimal conditions. These findings may serve as a critical reference for the treatment of high-suspended solids in coal mining water and have significant potential for engineering application.

随着我国煤炭行业的不断完善和经济发展，近年来对废水排放特征的研究越来越受到关注。镇流絮凝技术，近年来得到广泛应用。然而，它对废水中絮凝物沉降速度的影响尚未量化。本研究旨在筛选压载絮凝的最佳反应条件，并推导出这些条件下压载絮凝物的沉降速度。结果表明，压载物尺寸对浊度和悬浮物去除率无显着影响；但有效缩短了沉降时间，15分钟内浊度去除率可达95%以上。 s。由于反应条件的优化，90%的絮体尺寸分布在80-200μm范围内。此外，压载絮凝的理论值与实测值差异较小，表明推导出的公式可以有效量化最佳条件下压载絮凝物的沉降速度。这些发现可为煤矿水中高悬浮物的处理提供重要参考，具有重要的工程应用潜力。