Determination Of The Spreading-velocity Of
Nitroaromatic Compounds In Aquifers
Represented On The Basis Of Column Tests Under
In Situ Conditions
Author(s)
F. Jaenig
Abstract
Groundwater in the discharge area of former ammunition production facilities
often reveals severe contamination by production residues and waste products.
Thus, these can cause a health hazard to human beings in the case untreated
water is consumed. Based on a case study dealing with a more than 1.5 km
elongated contamination plume consisting of various nitroaromatic compounds
(NACs) such as TNT, DNT, DNB, TNB, ADNT and DNN the transportation
mechanisms were investigated for implementing a reliable risk-assessment.
Column tests were carried out by using both local soil in undisturbed cores and
the contaminated local groundwater. The investigations showed that the sorption
and respectively the velocity of transportation of every NAC strongly correlates
with the percentage composition of clay and organic matter in the soil as well as
with their own concentration in solution, resulting in complex interactions
between single NACs. Nevertheless the parameters obtained from the column
tests for retardation, adsorption-capacity and the resultant mobility of the NACs
are confirmed by the observed spreading of the contamination plume in situ.
Although a time-dependent distribution of the NACs in the wells downstream
can be observed, no notable degradation of their total concentration could be
ascertained up to now. Therefore calculations were made in view of the amount
of the former waste products, their amount of NACs, the soil parameters quoted
above and the dissolution-capacity of NACs for determining the former
infiltration and respectively the expected duration of dissolution and desorption.
Keywords: nitroaromatic compounds, sorption, spreading-velocity, multicompound
system.
Keywords
nitroaromatic compounds, sorption, spreading-velocity, multicompound
system.
Related Book
Other papers in this volume
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