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Titolo:
Multicomponent simulation of wastewater-derived nitrogen and carbon in shallow unconfined aquifers II. Model application to a field site
Autore:
MacQuarrie, KTB; Sudicky, EA; Robertson, WD;
Indirizzi:
Univ New Brunswick, Dept Civil Engn, Fredericton, NB E3B 5A3, Canada Univ New Brunswick Fredericton NB Canada E3B 5A3 cton, NB E3B 5A3, Canada Univ Waterloo, Dept Earth Sci, Waterloo, ON N2L 3G1, Canada Univ WaterlooWaterloo ON Canada N2L 3G1 ci, Waterloo, ON N2L 3G1, Canada
Titolo Testata:
JOURNAL OF CONTAMINANT HYDROLOGY
fascicolo: 1, volume: 47, anno: 2001,
pagine: 85 - 104
SICI:
0169-7722(200101)47:1<85:MSOWNA>2.0.ZU;2-P
Fonte:
ISI
Lingua:
ENG
Soggetto:
DOMESTIC SEPTIC SYSTEM; BIOGEOCHEMICAL EVOLUTION; CONCEPTUAL-MODEL; TRANSPORT MODEL; SATURATED ZONE; CHEMICAL FATE; TANK EFFLUENT; WATER; DENITRIFICATION; GEOCHEMISTRY;
Keywords:
wastewater; plume; simulation; nitrate; groundwater;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Agriculture,Biology & Environmental Sciences
Citazioni:
38
Recensione:
Indirizzi per estratti:
Indirizzo: MacQuarrie, KTB Univ New Brunswick, Dept Civil Engn, POB 4400, Fredericton, NB E3B 5A3, Canada Univ New Brunswick POB 4400 Fredericton NB Canada E3B 5A3
Citazione:
K.T.B. MacQuarrie et al., "Multicomponent simulation of wastewater-derived nitrogen and carbon in shallow unconfined aquifers II. Model application to a field site", J CONTAM HY, 47(1), 2001, pp. 85-104

Abstract

A multicomponent reactive transport model as presented by MacQuarrie and Sudicky [MacQuarrie, K.T.B.. Sudicky, E.A., this volume. Multicomponent simulation of wastewater-derived nitrogen and carbon in shallow unconfined aquifers: I. Model formulation and performance. J. Contam. Hydrol.] is applied to a well-studied wastewater plume in a sandy aquifer near Cambridge. Ontario. Domestic wastewater is released into the unsaturated zone via a drain field at a depth of about 0.8 m. The physical transport parameters for the model are obtained by simulating a non-reactive solute, while kinetic input data for the nitrogen and carbon reaction network are obtained from the literature. The model shows that the wastewater-loading rate has little influence on the moisture content in the unsaturated zone, thus oxygen diffusion in the air phase is an important transport mechanism. The model results arein general agreement with the field-determined moisture and oxygen profiles near the drain field. The simulation results show that oxidation of ammonium and dissolved organic carbon (DOC) goes to completion in the 1.5-m distance between the drain field and the water table, and that calcite dissolution limits the pH reduction to about 0.2 units. The model-predicted nitrateconcentrations in the core of the plume are in the range of 20-25 mg N/l and are in good agreement with the field data. Overall. the results for the major reactive species from the model simulation agree well with the geochemical data obtained below the drain field and it is concluded that the major physical and biochemical processes have been correctly captured in the current model formulation. (C) 2001 Elsevier Science B.V. All rights reserved.

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Documento generato il 03/12/20 alle ore 05:14:45