produced in vast quantities due to their numerous applications such as herbicides, insecticides, fungicides, solvents, hydraulic and heat transfer fluids, plasticizers, and intermediates for chemical synthesis. Because of their toxicity, bio-concentration, and persistence, the ubiquitous distribution of the halogenated compounds in the biosphere has caused public concern over the possible effec...

Horizontal contaminant transport through unsaturated soil been demonstrated both analytically and experimentally. The water and solute transport equations were solved using the Boltzman transformation, to convert the partial differential equations to ordinary differential equations. The resulted mathematical model was verified using experimental data. A laboratory scale column system was constr...

We investigate the spatial and temporal features of dense contaminant plumes dynamics in porous materials. Our analysis is supported by novel experimental results concerning pollutant concentration profiles inside a vertical column setup. We describe the experimental methods and elucidate the salient outcomes of the measurements, with focus on miscible fluids in homogeneous saturated media. By ...

Long-lived species are particularly susceptible to bioaccumulation of lead in bone tissues. In this paper we gain insights into the sublethal effects of lead contamination on Egyptian vultures (Neophron percnopterus). Our approach was done on the comparison of two populations (Canary Islands and Iberian Peninsula) differing in exposures to the ingestion of lead ammunition. Blood lead levels wer...

Well vulnerability maps can be used to quantify the potential impact of contaminant sources on a well or well field. Well vulnerability can be expressed in terms of the expected contaminant concentration in the extracted well water and the time history of these concentrations, thus accounting for dilution in the well by mixing with clean water. The information contained in the vulnerability map...

The paper presents a GIS based spatial decision support system for modelling contaminant intrusion into water distribution system. Three models have been developed to simulate the process and risk of contamination. A seepage model predicts the contaminant zone of pollution sources and the change of concentration during migration through soil. A pipe condition assessment model ranks the conditio...

Biosorption is the ability of biological materials to accumulate heavy metals from wastewater through metabolically mediated or physico-chemical pathways. Here, Heavy metals are considered to be the common contaminant of ecosystem due to their toxicity and it is necessary to remove those metals from environment. Among various metals, lead was considered to be common contaminant which causes sev...

In this paper, a fuzzy based method for hazardous contaminants localization using sensor networks will be proposed. The proposed method can perform well in noisy environments and in case of faulty sensor readings. Each node senses the contaminant concentration value around itself and broadcasts it along with its position information through sensor network. This way, all nodes have the current p...

Trends in concentrations of nonpoint-source contaminants in wells, springs, and streams are related to the history of contamination in groundwater recharge and the age distribution in the groundwater discharge. The age distribution in discharge depends on the groundwater age distribution in the aquifer and the subset of flowpaths that are sampled by the discharge. Groundwater travel times from ...

The study of airflow and contaminant transport in airliner cabins is very important for creating a comfortable and healthy environment. This paper shows the results of such a study by conducting experimental measurements and numerical simulations of airflow and contaminant transport in a section of half occupied, twin-aisle cabin mockup. The air velocity and air temperature were measured by ult...