Tannery wastewater is an industrial effluent characterized by high and variable concentrations of complex pollutants. These contaminants pose a high risk to the environment if discharged into a body of water without undergoing proper treatment. This study evaluated the performance of a pilot-scale hybrid constructed wetland system (horizontal subsurface flow + free water surface flow) for tannery wastewater treatment. The pollutant removal efficiency of the hybrid constructed wetland was determined, and the chromium bioaccumulation and growth and survival parameters of the macrophytes Isolepis cernua and Nasturtium aquaticum were evaluated. The 5-day biological oxygen demand, the chemical oxygen demand, total suspended solids, total dissolved solids and chromium reached maximum levels (98%, 97%, 97%, 33% and 98%, respectively) after treatment in the pilot-scale hybrid constructed wetland. The average concentrations of the 5-day biological oxygen demand, chemical oxygen demand, total suspended solids and chromium were within the discharge limits established by national and international organizations for surface water bodies. The macrophytes had low levels of chromium bioconcentration and translocation, with the growth and survival, especially of Isolepis cernua, revealing a high capacity to adapt to the variability and possible toxic effects of tannery wastewater. In general, the pilot-scale hybrid constructed wetland proved to be a feasible alternative for the treatment of tannery wastewater in an important industrial zone in Peru.

制革废水是一种工业废水，其特征是复杂污染物的浓度高而易变。如果不经过适当处理将其排放到水体中，这些污染物会对环境构成高风险。这项研究评估了用于皮革厂废水处理的中规模混合人工湿地系统（水平地下流量+自由水表面流量）的性能。确定了混合人工湿地的污染物去除效率，以及大型植物Isolepis cernua和Nasturtium aquaticum的铬生物积累以及生长和生存参数被评估。在中试规模下处理后，5天生物需氧量，化学需氧量，总悬浮固体，总溶解固体和铬达到最高水平（分别为98％，97％，97％，33％和98％）混合人工湿地。5天生物需氧量，化学需氧量，总悬浮固体和铬的平均浓度在国家和国际组织为地表水体确定的排放限值之内。大型植物的铬生物富集和易位水平较低，并且具有生长和存活能力，尤其是白蜡虫，显示出较高的能力来适应制革废水的可变性和可能的​​毒性作用。总的来说，在秘鲁的一个重要工业区，试验规模的混合人工湿地被证明是处理制革废水的可行替代方案。