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Agronomy 2019, 9(4), 170; https://doi.org/10.3390/agronomy9040170

Multi-Year N and P Removal of a 10-Year-Old Surface Flow Constructed Wetland Treating Agricultural Drainage Waters

Department of Agronomy, Food, Natural Resources and Environment (DAFNAE), University of Padova. Viale dell’Università 16, 35020 Legnaro (PD), Italy
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Received: 15 February 2019 / Revised: 18 March 2019 / Accepted: 27 March 2019 / Published: 29 March 2019
(This article belongs to the Special Issue Agricultural Water Management)
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Abstract

Surface flow constructed wetlands (SFCWs) can be effectively used to treat agricultural drainage waters, reducing N and P surface water pollution. In the Venice Lagoon drainage basin (northeastern Italy), an SFCW was monitored during 2007–2013 to assess its performance in reducing water, N, and P loads more than 10 years after its creation. Nitrogen concentrations showed peaks during winter due to intense leaching from surrounding fields. Phosphorus concentrations were higher after prolonged periods with no discharge, likely due to mobilization of P of the decomposing litter inside the basin. Over the entire period, N removal efficiency was 83% for NO3–N and 79% for total N; P removal efficiency was 48% for PO4–P and 67% for total P. Values were higher than in several other studies, likely due to the fluctuating hydroperiod that produced discontinuous and reduced outflows. Nitrogen outlet concentrations were reduced by the SFCW, and N removal ratios decreased with increasing hydraulic loading, while no strong correlations were found in the case of P. The SFCW was shown to be an effective long-term strategy to increase water storage and reduce N and P loads in the Venice Lagoon drainage basin. View Full-Text
Keywords: removal efficiency; surface water treatment; fluctuating hydroperiod; nonpoint-source pollution; nitrogen; phosphorus removal efficiency; surface water treatment; fluctuating hydroperiod; nonpoint-source pollution; nitrogen; phosphorus
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Tolomio, M.; Dal Ferro, N.; Borin, M. Multi-Year N and P Removal of a 10-Year-Old Surface Flow Constructed Wetland Treating Agricultural Drainage Waters. Agronomy 2019, 9, 170.

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