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Titolo:
Multicomponent simulation of wastewater-derived nitrogen and carbon in shallow unconfined aquifers I. Model formulation and performance
Autore:
MacQuarrie, KTB; Sudicky, EA;
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: 53 - 84
SICI:
0169-7722(200101)47:1<53:MSOWNA>2.0.ZU;2-#
Fonte:
ISI
Lingua:
ENG
Soggetto:
VARIABLY-SATURATED FLOW; OPERATOR-SPLITTING TECHNIQUE; DISPERSION REACTION EQUATION; NONSYMMETRIC LINEAR-SYSTEMS; DOMESTIC SEPTIC SYSTEM; POROUS-MEDIA; CONTAMINANT TRANSPORT; CONCEPTUAL-MODEL; BIOGEOCHEMICAL EVOLUTION; HYDRAULIC CONDUCTIVITY;
Keywords:
reactive transport; modeling; nitrogen; kinetics; groundwater; wastewater;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Agriculture,Biology & Environmental Sciences
Citazioni:
99
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 e E.A. Sudicky, "Multicomponent simulation of wastewater-derived nitrogen and carbon in shallow unconfined aquifers I. Model formulation and performance", J CONTAM HY, 47(1), 2001, pp. 53-84

Abstract

One of the most common methods to dispose of domestic wastewater involves the release of septic effluent from drains located in the unsaturated zone. Nitrogen from such systems is currently of concern because of nitrate contamination of drinking water supplies and eutrophication of coastal waters. The objectives of this study are to develop and assess the performance of amechanistic flow and reactive transport model which couples the most relevant physical, geochemical and biochemical processes involved in wastewater plume evolution in sandy aquifers. The numerical model solves for variably saturated groundwater flow and reactive transport of multiple carbon- and nitrogen-containing species in a three-dimensional porous medium. The reactive transport equations are solved using the Strang splitting method which is shown to be accurate for Monod and first- and second-order kinetic reactions, and two to four times more efficient than sequential iterative splitting. The reaction system is formulated as a fully kinetic chemistry problem,which allows for the use of several special-purpose ordinary differential equation (ODE) solvers. For reaction systems containing both fast and slow kinetic reactions, such as the combined nitrogen-carbon system, it is foundthat a specialized stiff explicit solver fails to obtain a solution. An implicit solver is more robust and its computational performance is improved by scaling of the fastest reaction rates. The model is used to simulate wastewater migration in a 1-m-long unsaturated column and the results show significant oxidation of dissolved organic carbon (DOC). the generation of nitrate by nitrification, and a slight decrease in pH. (C) 2001 Elsevier Science B.V. All rights reserved.

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Documento generato il 22/10/20 alle ore 03:16:15