Laundry wastewater has a high amount of dirt from the washed items and chemical additives used in washing process. Aiming the primary treatment of this type of wastewater, three different natural coagulants (Tanfloc POP, Tanfloc SL, and Tanfloc SG) were evaluated in the removal of color and turbidity by the coagulation/flocculation/sedimentation process (C/F/S). The results showed that the time between 5 and 10 min was sufficient for the sedimentation of the flakes, with a time of 10 min being adopted for further studies. The statistical analysis and the cost of acquiring the coagulant were decisive in the selection of the best natural coagulant. The maximum values of color (88.7%) and turbidity (92.8%) removal efficiency occurred at a concentration of 120 mg L⁻¹ (concentration determined by the Fischer LSD test) and the lowest cost (0.75$) obtained for the Tanfloc POP coagulant. The volume of sludge generated was higher in the treated effluent sample compared to the control sample, which proves the removal of total solids present in the effluent. The Tanfloc POP coagulant showed a high performance in removing color and turbidity from industrial laundry wastewater; it has been as a promising coagulant in the primary treatment of wastewater in this service sector.

洗衣废水含有大量来自洗涤物品的污垢和洗涤过程中使用的化学添加剂。针对此类废水的初级处理，评估了三种不同的天然混凝剂（Tanfloc POP、Tanfloc SL 和 Tanfloc SG）在混凝/絮凝/沉淀过程 (C/F/S) 中去除颜色和浊度的效果。结果表明，5-10分钟的时间足以使薄片沉降，进一步研究采用10分钟的时间。在选择最佳天然混凝剂时，统计分析和获得混凝剂的成本是决定性的。颜色 (88.7%) 和浊度 (92.8%) 去除效率的最大值出现在 120 mg L ^-1的浓度下（由 Fischer LSD 测试确定的浓度）和 Tanfloc POP 混凝剂的最低成本（0.75 美元）。与对照样品相比，处理过的流出物样品中产生的污泥量更高，这证明去除了流出物中存在的总固体。Tanfloc POP混凝剂在去除工业洗衣废水的颜色和浊度方面表现出高性能；在该服务部门的废水初级处理中，它一直是一种很有前途的混凝剂。