Impact of Residual NAPL on Water Flow and Heavy Metal Transfer in a Multimodal Grain Size Soil under Saturation Conditions: Implications for Contaminant Mobility

2009 ◽  
pp. 126-126-12 ◽  
Author(s):  
R Galvez-Cloutier ◽  
J-S Dubé
Keyword(s):  
Heavy Metal ◽  
Grain Size ◽  
Water Flow ◽  
Metal Transfer ◽  
Contaminant Mobility

scholarly journals Flow Characteristics and Grain Size Distribution of Granular Gangue Mineral by Compaction Treatment

2017 ◽  
Vol 2017 ◽  
pp. 1-7 ◽  
Author(s):  
Ran Yuan ◽  
Dan Ma ◽  
Hongwei Zhang
Keyword(s):  
Weight Loss ◽  
Grain Size ◽  
Size Distribution ◽  
Grain Size Distribution ◽  
Water Flow ◽  
Fine Particles ◽  
Flow Characteristics ◽  
Test System ◽  
Chemical Components ◽  
Gangue Mineral

A test system for water flow in granular gangue mineral was designed to study the flow characteristics by compaction treatment. With the increase of the compaction displacement, the porosity decreases and void in granular gangue becomes less. The main reason causing initial porosity decrease is that the void of larger size is filled with small particles. Permeability tends to decrease and non-Darcy flow factor increases under the compaction treatment. The change trend of flow characteristics shows twists and turns, which indicate that flow characteristics of granular gangue mineral are related to compaction level, grain size distribution, crushing, and fracture structure. During compaction, larger particles are crushed, which in turn causes the weight of smaller particles to increase, and water flow induces fine particles to migrate (weight loss); meanwhile, a sample with more weight of size (0–2.5 mm) has a higher amount of weight loss. Water seepage will cause the decrease of some chemical components, where SiO2 decreased the highest in these components; the components decreased are more likely locked at fragments rather than the defect of the minerals. The variation of the chemical components has an opposite trend when compared with permeability.

scholarly journals Geochemistry and mineralogy of recent sediments of Guanabara Bay (NE sector) and its major rivers - Rio de Janeiro State - Brazil

2001 ◽  
Vol 73 (1) ◽  
pp. 121-133 ◽  
Author(s):  
MARCIA DE MELO FARIA ◽  
BRAZ A. SANCHEZ
Keyword(s):  
Heavy Metal ◽  
Grain Size ◽  
Clay Minerals ◽  
Bottom Sediments ◽  
River Sediments ◽  
Size Fraction ◽  
River Mouth ◽  
Guanabara Bay ◽  
Metal Contents ◽  
Recent Sediments

Geochemical and clay mineralogical studies of bottom sediments collected along the Macacu and Caceribu rivers and Guanabara Bay were carried out in order to investigate the relationship between major source areas and recent sediments of the bay. Clay mineralogy includes different groups with selective distribution conditioned by geomorphic features and depositional settings. Micaceous clay minerals are abundant near parent rock in the upper course, whereas kaolinite derived from varied sources is gradually concentrated towards the estuary. In the Guanabara Bay, kaolinite accumulates near river mouths, while micaceous clay minerals are converted into mixed layers in the estuary. Analyses of heavy metal contents reveal higher levels of Zn and Cu in sediments of the bay than in river sediments. Profiles along rivers indicate a downstream decrease of heavy metals, whereas in the bay geochemical trends display greater variations. In general river mouth sediments present the lowest concentrations. At the north and east of Paquetá Island anomalous areas with the highest heavy metal contents occur. Cu tends to concentrate in < 2mum grain-size fraction and indicates an association with micaceous clay minerals in the upper river course. However, Cu retention seems to be further controlled by other components of bottom sediments due to changes in physical and chemical conditions of the estuarine environment. Zn shows unstable behavior along the rivers and concentrates in the bay. Pb displays small variations from river to bay sediments, and accumulates mainly in the < 63mum grain-size fraction without any association with clay mineral. Geoaccumulation indexes of Cu, Pb and Zn classify the study area as unpolluted in both studied rivers and in the NE sector of the bay, though the enrichment factors are higher in the bay. The study does not indicate those rivers as major sources of heavy metal pollution to the bay.

Sedimentation in the Reservoir of the Altenwoerth Hydropower Plant

1990 ◽  
Vol 22 (5) ◽  
pp. 173-180
Author(s):  
H. P. Nachtnebel ◽  
W. Summer ◽  
H. Mueller ◽  
B. Schwaighofer
Keyword(s):  
Heavy Metal ◽  
Grain Size ◽  
Longitudinal Section ◽  
Hydropower Plant ◽  
Sediment Layer ◽  
Stream Power ◽  
Metal Concentrations ◽  
Heavy Metal Concentrations ◽  
Sludge Disposal ◽  
River Bed

This paper addresses two objectives. The first objective is to describe the sedimentation process in the reservoir of the hydropower scheme Altenwoerth. It is located on the Austrian part of the Danube about 60 km upstream from Vienna. Starting in 1976 the aggradation of the river bed has been monitored annually to estimate the sedimentation rate along a longitudinal section in the reservoir. Further, cores were taken over the whole sediment layer to analyse the grain size distribution, the bulk density, the mineralogic structure of the sediment and the heavy metal concentrations in the layer. It was found that the annual average sedimentation of suspended material amounts to 390 000 m3/a. The grain size of the samples vary from well sorted sands to poorly sorted, clay rich sediments. The heavy metal concentrations refer to the fraction less than 20 µ m. In comparison to the guidelines for sewage sludge disposal the observed heavy metal content of zn and Pb is slightly above the respective limits. The second objective is to demonstrate the application of a one dimensional sedimentation model which describes the accumulation over the operation period from 1976 to 1985. The model is related to the unit stream power concept and is based on the transport capacity equation of Engelund and Hansen. The model yields satisfying results for both the quantity of the sediment and also its gradation.

scholarly journals Preliminary Study of Heavy Metal (Zn, Pb, Cr, As, Cu, Cd) Contaminations on Different Soil Level from Post-Mining Bauxite Production for Aquaculture

2018 ◽  
Vol 47 ◽  
pp. 02008
Author(s):  
Risandi Dwirama Putra ◽  
Tri Apriadi ◽  
Ani Suryanti ◽  
Henky Irawan ◽  
Tengku Said Raja'I ◽  
...  
Keyword(s):  
Heavy Metals ◽  
Heavy Metal ◽  
Grain Size ◽  
Negative Impact ◽  
Fine Sand ◽  
Mining Area ◽  
Grain Size Analysis ◽  
Size Analysis ◽  
The Mean ◽  
Soil Level

Bauxite production and exploration give negative impact environmental modification and increasing concern pollution of heavy metals. One of an alternative to reduce the negative impact of bauxite post-mining production is by re-utilizing the abandoned bauxite land and necessary exploratory study to obtain the current environmental conditions primarily related to heavy metals in bauxite mining area. Soil and water quality samples from 5 (five) sites based on post-mining activities were used to determine concentration heavy metals of As, Cd, Pb, Zn, Cr, Cu from different soil level. They were also collected for grain size analysis including those of sand and mud percentages along with the mean, and sorting analysis. The mean grain size post-mining bauxite ranged between very fine sand to medium sand and had heterogeneous texture. The coarse grain size percentage increased towards the bottom of the soil. Total heavy metal contents for post-mining bauxite soils are 0,081 ppm, 0,245 to 0,471 ppm and 0,007 ppm for As, Pb and Cd respectively. Heavy metals for Cd, uniformly at every depth from soil level. On the other hand, Pb showed significance pattern, it was indicated every depth from soil level, the concentration of Pb was different.

scholarly journals Soil Heavy Metal Distribution with Depth around a Closed Landfill and Their Uptake by Datura stramonium

2020 ◽  
Vol 2020 ◽  
pp. 1-14
Author(s):  
Peace Makuleke ◽  
Veronica M. Ngole-Jeme
Keyword(s):  
Heavy Metals ◽  
Heavy Metal ◽  
Transfer Coefficient ◽  
Datura Stramonium ◽  
Metal Transfer ◽  
Control Site ◽  
Soil Samples ◽  
Metal Enrichment ◽  
Soil Heavy Metal ◽  
Heavy Metal Enrichment

Landfills are major sources of environmental pollution. This study evaluated heavy metal concentrations in soils and plants around the closed Lumberstewart landfill in Bulawayo, Zimbabwe, to determine the pollution potential of a closed landfill and the risks they present to plants growing in this environment and surrounding communities. Soil samples were collected at depths of 0–30 cm, 30–60 cm, and 60–90 cm around the landfill and at a control site and characterized for various properties and concentrations of Cd, Cu, Cr, Fe, Ni, and Zn. Samples of Datura stramonium, collected from the same sites where soil samples were collected, were also analyzed for the same heavy metals. The soils were sandy, mostly acidic (5.01 < pH < 7.65) with low organic matter content (<2%) and cation exchange capacity (<15 meq/100 g). These properties varied with depth around the landfill. Heavy metals concentrations in the soils and Datura stramonium followed the order Fe > Zn > Cu > Cr > Ni > Cd with samples from around the landfill having higher concentrations than samples from the control site. Soil heavy metal enrichment was highest at a depth of 30–60 cm. Pollution load index (PLI) values indicated that all sites around the landfill were polluted (PLI > 1). Heavy metal transfer coefficient in Datura stramonium ranged between 0.0 and 209 with <60% of the variation observed in heavy metal transfer coefficient in Datura stramonium explained by the extent of heavy metal enrichment in the soils. More than 20 years after closure of the landfill, there are indications that leachate migration may still be going on around the landfill. Monitoring of environments around closed landfills needs to be ongoing to mitigate negative impacts on humans and the environment.

The fate of char in controlling the rate of heavy metal transfer from soil to potato

2021 ◽  
Author(s):  
Vahideh Esmaeili ◽  
Shu Zhang ◽  
Xun Hu ◽  
Mortaza Gholizadeh
Keyword(s):  
Heavy Metal ◽  
Metal Transfer
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