In the treatment of wastewater from vehicle washing, the coagulation/flocculation process using inorganic coagulant is mostly applied; it may or may not be combined with other processes. In literature, few studies use natural coagulants and assess the surfactants’ removal among the physical-chemical parameters, particularly using the adsorption process. In order to fill this knowledge gap, this work aimed to treat the car wash wastewater, applying a combined process of coagulation/flocculation/sedimentation (C/F/S) and adsorption. Process efficiency was evaluated according to the removal of color, turbidity, total solids, volatile solids, total dissolved solids, chemical oxygen demand and surfactants. For primary effluent treatment, C/F/S experiments were performed with Tanfloc SG to investigate the influence of the natural coagulant concentration in color and turbidity removal efficiency. The results showed that 220 mg L⁻¹ was the best coagulant concentration (turbidity = 97.5%; color = 92.5%) (p < 0.05). The supernatant of the C/F/S process was applied to the sequential adsorption process (kinetics and isotherm) with mineral activated carbon. The equilibrium time of the kinetic experiment was established after 2 h of contact, and the Langmuir isotherm model best described the surfactant adsorption behavior (R² = 0.93; q_max = 5.65 mg g⁻¹). The combined process enhanced the treatment efficiency achieving an overall removal efficiency of 97.3% for color, 98.8% for turbidity, 92.6% for chemical oxygen demand, and 97.2% for surfactants. The combined process proved to be promising for the treatment of car wash wastewater, presenting a reduction surfactant concentration and on the other parameters evaluated, contributing to environmental sustainability.

在处理洗车产生的废水时，大多采用无机混凝剂进行混凝/絮凝工艺。它可能会也可能不会与其他进程结合在一起。在文献中，很少有研究使用天然凝结剂并评估物理化学参数中表面活性剂的去除，特别是使用吸附过程。为了填补这一知识空白，这项工作旨在处理凝结/絮凝/沉淀（C / F / S）和吸附的组合过程，以处理洗车废水。根据颜色，浑浊度，总固体，挥发性固体，总溶解固体，化学需氧量和表面活性剂的去除率评估工艺效率。对于初级污水处理，用Tanfloc SG进行了C / F / S实验，以研究天然凝结剂浓度对颜色和浊度去除效率的影响。结果表明220 mg L^-1是最佳凝结剂浓度（浊度= 97.5％；颜色= 92.5％）（p  <0.05）。将C / F / S过程的上清液与矿物活性炭一起应用于顺序吸附过程（动力学和等温线）。接触2 h后建立动力学实验的平衡时间，Langmuir等温模型最能描述表面活性剂的吸附行为（R ²  = 0.93；q _max  = 5.65 mg g ^-1）。组合工艺提高了处理效率，实现了颜色的总去除效率为97.3％，浊度为98.8％，化学需氧量为92.6％和表面活性剂为97.2％。事实证明，该组合工艺有望用于洗车废水的处理，其表面活性剂浓度降低，并且在评估的其他参数上，有助于环境的可持续性。