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Titolo:
Uptake of N-15 by macrophytes in subsurface-flow wetlands treating domestic wastewater
Autore:
Weaver, RW; Lane, JJ; Johns, MJ; Lesikar, BJ;
Indirizzi:
Texas A&M Univ, Dept Soil & Crop Sci, College Stn, TX 77843 USA Texas A&M Univ College Stn TX USA 77843 op Sci, College Stn, TX 77843 USA Texas A&M Univ, Dept Agr Engn, College Stn, TX 77843 USA Texas A&M Univ College Stn TX USA 77843 r Engn, College Stn, TX 77843 USA
Titolo Testata:
ENVIRONMENTAL TECHNOLOGY
fascicolo: 7, volume: 22, anno: 2001,
pagine: 837 - 843
SICI:
0959-3330(200107)22:7<837:UONBMI>2.0.ZU;2-J
Fonte:
ISI
Lingua:
ENG
Soggetto:
CONSTRUCTED WETLANDS; REMOVAL; PHYTOREMEDIATION; NITROGEN; AMMONIUM; SYSTEM; WATER;
Keywords:
constructed wetlands; secondary effluent; macrophytes; water quality; ammonium;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Agriculture,Biology & Environmental Sciences
Citazioni:
26
Recensione:
Indirizzi per estratti:
Indirizzo: Weaver, RW Texas A&M Univ, Dept Soil & Crop Sci, College Stn, TX 77843 USATexas A&M Univ College Stn TX USA 77843 lege Stn, TX 77843 USA
Citazione:
R.W. Weaver et al., "Uptake of N-15 by macrophytes in subsurface-flow wetlands treating domestic wastewater", ENV TECHNOL, 22(7), 2001, pp. 837-843

Abstract

Constructed subsurface-flow wetlands are becoming more common for on-site treatment of domestic wastewater to provide secondary quality effluent. Macrophytes are generally added to wetlands to increase treatment efficiency but their role in reducing N content is controversial. Our investigation utilized two subsurface-flow wetlands to determine the efficiency of differentmacrophytes in uptake of N-15 labeled ammonium sulfate. Macrophytes in Wetland 1 recovered 35 % of the added N in their shoots but only 5 % of the added N was recovered in the shoots and roots in Wetland 2. A major difference for the two wetlands was N and hydraulic loadings. Wetland 1 received 7.5Kg N ha(-1)d(-1) and Wetland 2 received 16.9 Kg N ha(-1)d(-1). Retention time for Wetland I based on pore volumes was 2.9 d and for Wetland 2 it was 1.2 d. The retardation factor for NH4+ was approximately 2.5 for both wetlands and the breakthrough curves indicated lack of plug flow. The importanceof macrophytes in taking up NH4 appeared to dependent on N and hydraulic loadings.

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Documento generato il 01/12/20 alle ore 07:51:32