Phosphorus removal from agricultural runoff by enhanced denitrifying woodchip bioreactors

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216305%3A26110%2F18%3APU128670" target="_blank" >RIV/00216305:26110/18:PU128670 - isvavai.cz</a>

Result on the web

<a href="http://dx.doi.org/10.5593/sgem2018/5.1/S20.083" target="_blank" >http://dx.doi.org/10.5593/sgem2018/5.1/S20.083</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.5593/sgem2018/5.1/S20.083" target="_blank" >10.5593/sgem2018/5.1/S20.083</a>

Result language

angličtina

Original language name

Phosphorus removal from agricultural runoff by enhanced denitrifying woodchip bioreactors

Original language description

The water pollution caused by nutrients has become a problem, especially in agricultural areas. Nitrogen (N) and phosphorus (P) can cause the eutrophication of surface waters, and problems with their use as drinking water sources. One of the possible solutions is to employ denitrifying bioreactors, which are used for the reduction of high nitrate concentrations in shallow groundwaters. Our research was focused on the enhancement of these bioreactors with steel byproducts. These materials release Fe, which causes the precipitation and adsorption of P. The contribution presents the results of laboratory tests with 4 denitrifying columns. The columns were filled with the same material (poplar woodchips) and two of them were enhanced by the addition of steel turnings upstream of the wood medium. Inlet concentrations were approx. 20 mg/L of NO3-N and 1 mg/L of TP (total phosphorus). The bioreactors were operated for 9 weeks and the physicochemical parameters at the inlet and outlet were determined weekly – temperature, pH, oxidation-reduction potential (ORP), NO3-N, TP, and Fe. According to the results, the addition of steel has no noticeable impact on the pH, ORP and NO3-N at the outlet: there was no significant difference between the standard columns and the columns enhanced by steel turnings. The NO3-N removal initially increased with the time of column operation, stabilizing after 3 weeks of operation. In the 9th week, the outlet NO3-N concentration decreased to 1.3 mg/L; NO3-N removal efficiency was 94 % on average. In the first 5 weeks, the outlet TP concentrations increased due to woodchip leaching. The enhanced columns achieved higher P removal with a TP removal efficiency in the 9th week of 58 %. In the case of the columns with woodchips only, no TP removal was observed. The concentrations of Fe leached from the columns enhanced with steel turnings had a decreasing tendency, dropping from 2.4 to 0.4 mg/L.

Czech name

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Czech description

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Type

D - Article in proceedings

CEP classification

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OECD FORD branch

40500 - Other agricultural sciences

Project

—

Continuities

S - Specificky vyzkum na vysokych skolach

Publication year

2018

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Article name in the collection

SGEM Conference Proceedings

ISBN

978-619-7408-46-1

ISSN

1314-2704

e-ISSN

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Number of pages

8

Pages from-to

645-652

Publisher name

STEF92 Technology Ltd.

Place of publication

51 Alexander Malinov Blvd., 1712, Sofia, Bulgari

Event location

Albena

Event date

Jun 30, 2018

Type of event by nationality

WRD - Celosvětová akce

UT code for WoS article

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