Staff Publications

Staff Publications

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    'Staff publications' is the digital repository of Wageningen University & Research

    'Staff publications' contains references to publications authored by Wageningen University staff from 1976 onward.

    Publications authored by the staff of the Research Institutes are available from 1995 onwards.

    Full text documents are added when available. The database is updated daily and currently holds about 240,000 items, of which 72,000 in open access.

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Record number 510431
Title Robust options to remove nitrate and phosphate from tile drainage
Author(s) Jansen, Stefan; Gerritse, Jan; Stuurman, Roelof; Chardon, W.J.; Talens, René
Event 10th International Drainage Symposium, Minneapolis, Minnesota, 2016-09-07/2016-09-09
Department(s) Alterra - Sustainable soil management
Publication type Contribution in proceedings
Publication year 2016
Abstract Diffuse emission from agricultural land is a major, persistent source of nitrogen and phosphorus in surface waters. In this contribution, we present field experiments of a series of robust options to remove nitrate and phosphorus at
field drainage level. Nitrate removal was enhanced by stimulating naturally occurring denitrification by adding wood chips. The results showed that the initial removal rates were high (between 60 and 80%). Efficiency decreases in case of periodic presence of oxygen. The concentrations of phosphate in the effluent showed peaks during the first year at high temperatures and l ow water
discharge. The emission of nitrous oxide to the surface above the drains was negligible, but was increased at the ends of the drains. It is estimated that the long-term efficiency depends on good control of the water levels and flow rates in the filter beds.
Phosphorus removal was enhanced by using iron-oxide coated sand as filter material. Three methods were tested: drains enveloped with iron oxide coated sand, an edge of field reactor and a slow sand filter reactor at the downstream end of the drainage canal. Results show that up to 95% of the phosphorus can be removed. A reduction of the hydraulic conductivity during the experimental period reduced the efficiency of the edge of field reactor and the slow sand filter reactor. For all phosphorus treatment options tested, high removal efficiencies could be reached and no negative side -effects were found.
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