Emanuel Nocetti, Hernán Ricardo Hadad, María Alejandra Maine
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Comparison of two hybrid constructed wetland configurations for dairy wastewater treatment.
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 (k). 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. k values showed that HCW1 was kinetically favored. The main strengths of the HSSF wetland were Org-N and NO3--N removals, but the weakness was NH4+-N removal under limited nitrification conditions. The HCW1 was efficient for nitrogen interconversions, leading to higher removal efficiencies than HCW2.
期刊介绍：
The International Journal of Phytoremediation (IJP) is the first journal devoted to the publication of laboratory and field research describing the use of plant systems to solve environmental problems by enabling the remediation of soil, water, and air quality and by restoring ecosystem services in managed landscapes. Traditional phytoremediation has largely focused on soil and groundwater clean-up of hazardous contaminants. Phytotechnology expands this umbrella to include many of the natural resource management challenges we face in cities, on farms, and other landscapes more integrated with daily public activities. Wetlands that treat wastewater, rain gardens that treat stormwater, poplar tree plantings that contain pollutants, urban tree canopies that treat air pollution, and specialized plants that treat decommissioned mine sites are just a few examples of phytotechnologies.
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