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Titolo:
CHEMICAL FATE AND TRANSPORT IN A DOMESTIC SEPTIC SYSTEM - APPLICATIONOF A VARIABLY SATURATED MODEL FOR CHEMICAL MOVEMENT
Autore:
SHUTTER SB; SUDICKY EA; ROBERTSON WD;
Indirizzi:
UNIV WATERLOO,WATERLOO CTR GROUNDWATER RES WATERLOO N2L 3G1 ON CANADA
Titolo Testata:
Environmental toxicology and chemistry
fascicolo: 2, volume: 13, anno: 1994,
pagine: 223 - 231
SICI:
0730-7268(1994)13:2<223:CFATIA>2.0.ZU;2-I
Fonte:
ISI
Lingua:
ENG
Soggetto:
NATURAL GRADIENT EXPERIMENT; SOLUTE TRANSPORT; SAND AQUIFER; POROUS-MEDIA; GROUNDWATER; DISPERSION; CONTAMINANTS; FLOW;
Keywords:
SEPTIC SYSTEM; GROUND WATER; CONTAMINANTS; MODEL; SAND;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Science Citation Index Expanded
Science Citation Index Expanded
Citazioni:
23
Recensione:
Indirizzi per estratti:
Citazione:
S.B. Shutter et al., "CHEMICAL FATE AND TRANSPORT IN A DOMESTIC SEPTIC SYSTEM - APPLICATIONOF A VARIABLY SATURATED MODEL FOR CHEMICAL MOVEMENT", Environmental toxicology and chemistry, 13(2), 1994, pp. 223-231

Abstract

A detailed mathematical modeling study of the impact of a single-family septic system on groundwater quality is described. The work served to improve the conceptual understanding of subsurface processes associated with septic systems and lent insight into the fate of septic-system-derived chemicals. Two-dimensional saturated-unsaturated simulations of the chemical plume associated with the Septic system were successful in closely matching field observations. Results indicate that the plume has been subject to limited dispersion (or spreading) reflectingthe homogeneous nature of the aquifer materials. The sharp concentration gradients along the upper fringe of the plume near the water tableindicate weak vertical mixing and imply limited dilution by recharge water entering the aquifer downgradient of the septic system. Calibrated dispersivities were 10 cm for the longitudinal value (alpha(L)) and1 mm for the transverse vertical value (alpha(r)) The movement of reactive chemical constituents present in consumer detergent products entering the septic system was simulated to assess the influence of sorption and biodegradation. The migration of the detergent compounds linear alkylbenzene sulfonate (LAS) and nitrilotriacetic acid (NTA) was found to be controlled mainly by these processes, and the limited movement predicted by the model is consistent with that observed in the field, For a half-life equal to 15 d and a distribution coefficient (K-d) value equal to 1.5 L/kg in the unsaturated zone, LAS was predicted to move <0.5 m from the tile drains. However, chemicals having a significantly longer half-life or those which exhibit limited partitioning to the soil matrix are likely to migrate much further.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 27/11/20 alle ore 02:12:18