Nocetti Emanuel, Hadad Hernán Ricardo, Maine María Alejandra
Laboratorio de Química Analítica Ambiental, Instituto de Química Aplicada del Litoral (IQAL, CONICET-UNL), Facultad de Ingeniería Química, Universidad Nacional del Litoral (UNL), Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Santa Fe, Argentina.
Int J Phytoremediation. 2025;27(9):1329-1341. doi: 10.1080/15226514.2025.2495765. Epub 2025 May 2.
The aim was to evaluate the performance of two hybrid constructed wetlands (HCW) for the treatment of a dairy wastewater at pilot-scale. The HCW1 was composed of vertical flow (VF) and horizontal subsurface flow (HSSF) wetland units while the HCW2 of VF and free water surface (FWS) wetland units. Wastewater, plants, and sediment samples were collected to evaluate the removal efficiency and nutrient accumulation in plant tissues and sediment. Kinetics were evaluated using the volumetric removal rate (). COD and BOD decrease was significantly higher in HCW1 than in HCW2, due to chemical oxidation prevails in the VF stages and biological processes in the second stage of HCW1, leading to organic matter removal. Total nitrogen (TN) removal was comparable in the two HCW configurations. Nitrogen compounds interconversions were favored in HCW1 due to HSSF wetland conditions and higher plant biomass values in VF stages than in HCW2. Phosphorus removal was favored in FWS. values showed that HCW1 was kinetically favored. The main strengths of the HSSF wetland were Org-N and NO-N removals, but the weakness was NH-N removal under limited nitrification conditions. The HCW1 was efficient for nitrogen interconversions, leading to higher removal efficiencies than HCW2.
目的是在中试规模下评估两种复合人工湿地（HCW）处理奶牛场废水的性能。HCW1由垂直流（VF）和水平潜流（HSSF）湿地单元组成，而HCW2由VF和自由水面（FWS）湿地单元组成。采集了废水、植物和沉积物样本，以评估去除效率以及植物组织和沉积物中的养分积累情况。使用体积去除率（）评估动力学。HCW1中化学需氧量（COD）和生化需氧量（BOD）的降低显著高于HCW2，这是因为HCW1的VF阶段以化学氧化为主，第二阶段以生物过程为主，从而实现了有机物的去除。两种HCW配置中总氮（TN）的去除情况相当。由于HSSF湿地条件以及VF阶段的植物生物量值高于HCW2，HCW1更有利于氮化合物的相互转化。FWS有利于磷的去除。 值表明HCW1在动力学上更具优势。HSSF湿地的主要优点是对有机氮（Org-N）和硝态氮（NO-N）的去除，但缺点是在有限硝化条件下对氨氮（NH-N）的去除。HCW1对氮的相互转化效率较高，导致其去除效率高于HCW2。
