The fate of selected risk elements in constructed wetlands studied by AAS and flame photometry

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F60076658%3A12220%2F18%3A43898370" target="_blank" >RIV/60076658:12220/18:43898370 - isvavai.cz</a>

Result on the web

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DOI - Digital Object Identifier

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Result language

čeština

Original language name

The Fate of Selected Risk Elements in Constructed Wetlands Studied by AAS and Flame Photometry

Original language description

Methods of the trace element analysis (AAS and flame photometry) were used to study the fate of Cr, Pb, Cd, Mo, V, Be, Ba, As, Ni, Co, Sr, Li, Rb, Cu, Zn, Fe, and Mn in two constructed wetlands serving to treat municipal wastewater. The efficiency of the removal of some elements (Cd, Zn, Cu) was rather high whereas other ones (Sr, Rb, Li) were removed with poor efficiency. Fe, As, and V were even released to treated water which means that their outflow concentrations were higher than the inflow concentrations. The fate of studied elements in constructed wetlands is closely connected with the chemism of S and Fe in these systems. Under anaerobic conditions, when sulphates are reduced to H2S, some elements can be precipitated as hardly soluble sulphides forming sediments in the wetlands and are thus removed from wastewater. Reoxidation of Fe-II to Fe-III can also proceed close to the roots and rhizomes of the wetland plants. Thus, the precipitate of Fe2O3 is formed and some contaminants can be coprecipitated. The assimilation of some elements by the wetland plants should also be considered. In addition to suspended solids, organics and nitrogen compounds, constructed wetlands can remove some risk elements from treated water as well. They can serve as a suitable alternative to traditional mechanical-biological wastewater treatment plants in the case of small villages.

Czech name

The Fate of Selected Risk Elements in Constructed Wetlands Studied by AAS and Flame Photometry

Czech description

Methods of the trace element analysis (AAS and flame photometry) were used to study the fate of Cr, Pb, Cd, Mo, V, Be, Ba, As, Ni, Co, Sr, Li, Rb, Cu, Zn, Fe, and Mn in two constructed wetlands serving to treat municipal wastewater. The efficiency of the removal of some elements (Cd, Zn, Cu) was rather high whereas other ones (Sr, Rb, Li) were removed with poor efficiency. Fe, As, and V were even released to treated water which means that their outflow concentrations were higher than the inflow concentrations. The fate of studied elements in constructed wetlands is closely connected with the chemism of S and Fe in these systems. Under anaerobic conditions, when sulphates are reduced to H2S, some elements can be precipitated as hardly soluble sulphides forming sediments in the wetlands and are thus removed from wastewater. Reoxidation of Fe-II to Fe-III can also proceed close to the roots and rhizomes of the wetland plants. Thus, the precipitate of Fe2O3 is formed and some contaminants can be coprecipitated. The assimilation of some elements by the wetland plants should also be considered. In addition to suspended solids, organics and nitrogen compounds, constructed wetlands can remove some risk elements from treated water as well. They can serve as a suitable alternative to traditional mechanical-biological wastewater treatment plants in the case of small villages.

Type

J_imp - Article in a specialist periodical, which is included in the Web of Science database

CEP classification

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OECD FORD branch

40401 - Agricultural biotechnology and food biotechnology

Project

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Continuities

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Publication year

2018

Confidentiality

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

Name of the periodical

Chemické listy

ISSN

0009-2770

e-ISSN

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Volume of the periodical

112

Issue of the periodical within the volume

3

Country of publishing house

CZ - CZECH REPUBLIC

Number of pages

5

Pages from-to

191-195

UT code for WoS article

000429220900008

EID of the result in the Scopus database

2-s2.0-85045509646