Grain size of activated carbon, and untreated and modified granular clinoptilolite under freeze-thaw: applications to permeable reactive barriers

Polar Record ◽  
2006 ◽  
Vol 42 (2) ◽  
pp. 121-126 ◽  
Author(s):  
Damian B. Gore ◽  
Erika S. Heiden ◽  
Ian Snape ◽  
Geraldine Nash ◽  
Geoffrey W. Stevens
Keyword(s):  
Activated Carbon ◽  
Granular Materials ◽  
Permeable Reactive Barriers ◽  
Sem Images ◽  
Freeze Thaw ◽  
Particle Size Data ◽  
Reactive Barriers ◽  
Moisture Conditions ◽  
Size Data

Permeable reactive barriers are used to adsorb contaminants from soil water. Their fillings are granular materials whose stability under freezing conditions has not been demonstrated. In this research, three granular materials (activated carbon, raw clinoptilolite and a nutrient amended clinoptilolite) were subjected to freeze-thaw cycles at different moisture conditions, in order to simulate their use in permeable reactive barriers in areas of freezing ground. The <250 μm fraction, which will potentially accumulate grain fragments, showed no change for the carbon, but an increase from ∼1% to ∼3% abundance by volume for the clinoptilolite with modes at 100–200 μm. SEM images show cracks in the zeolite grains, forming fragments of the size observed in the particle size data. These findings may have implications for the long-term permeabilities of reactive barriers operated in areas of freezing ground.

scholarly journals Effects of calcium ion and pH on the adsorption/regeneration process by activated carbon permeable reactive barriers

RSC Advances ◽  
2018 ◽  
Vol 8 (30) ◽  
pp. 16834-16841 ◽  
Author(s):  
Shengpin Li ◽  
Wenpeng Li ◽  
Honghan Chen ◽  
Fei Liu ◽  
Song Jin ◽  
...  
Keyword(s):  
Activated Carbon ◽  
Calcium Ion ◽  
Groundwater Remediation ◽  
Permeable Reactive Barriers ◽  
Regeneration Process ◽  
Permeable Barriers ◽  
Reactive Barriers

Activated carbon (AC) is widely used in groundwater remediation, more specifically, for the activated carbon permeable barriers (AC-PRBs).

scholarly journals Application of permeable reactive barriers near roads for chloride ions removal

2010 ◽  
Vol 42 (2) ◽  
pp. 249-259 ◽  
Author(s):  
Joanna Fronczyk ◽  
Katarzyna Pawluk ◽  
Marta Michniak
Keyword(s):  
Activated Carbon ◽  
Chloride Ions ◽  
Permeable Reactive Barriers ◽  
Zero Valent Iron ◽  
Permeable Reactive Barrier ◽  
Polluted Water ◽  
Reactive Material ◽  
Reactive Materials ◽  
Run Off ◽  
Reactive Barriers

Application of permeable reactive barriers near roads for chloride ions removal One of the most critical sources of pollutants are road run-offs. Road run-off is a complex mixture of toxicants e.g. heavy metals, de-icing agents, organic compounds and water suspensions of solid substances. One of the most negative impact on the environment has sodium chloride which is used as de-icing agent. In the case of incorrect environment protection in the vicinity of roads pollutants may migrate to groundwater causing hazard to sources of potable water. One of the methods to prevent the migration of pollutants to groundwater is imposing the flow of polluted water through a reactive material filling a permeable reactive barrier (PRB). This paper examines the feasibility of selected reactive materials for the reduction chlorides concentration in road run-offs. Four different reactive materials: zero valent-iron, activated carbon, zeolite and geza rock have been chosen for studies. The tests results indicated that the most popular reactive materials used in PRB technology, activated carbon and zero-valent iron, removed exhibited the highest efficiency in chloride ions removal. Moreover, the composition of road run-off in samples collected along roads in Warsaw was determinated.

Investigations at the Barnes Site (40DV307)

2019 ◽  
pp. 91-110
Author(s):  
Thaddeus G. Bissett ◽  
Stephen B. Carmody ◽  
D. Shane Miller
Keyword(s):  
Large Scale ◽  
River Channel ◽  
Middle Woodland ◽  
Ohio Valley ◽  
Site Location ◽  
Late Archaic ◽  
Early Woodland ◽  
Particle Size Data ◽  
Size Data

At the Barnes Site (40DV307) along the Cumberland River, two discrete shell-bearing deposits dating to the Late Archaic and Middle Woodland periods (approximately 3500 and 1800 cal BP respectively) are separated by a thick Early Woodland–period shell-free stratum dated between 2900 and 2000 cal BP. Alternating shell-bearing and shell-free deposits at sites elsewhere in the southern Ohio Valley have often been viewed as indicative of long-term changes in subsistence practices and traditions or large-scale environmental fluctuations affecting resource abundance. At Barnes, however, chronological, geoarchaeology, and paleoethnobotany data from shell-bearing strata recovered in 2010 and 2012 suggest that the two shell-bearing deposits mark the locations of shellfish processing at or near the river’s edge when the river channel was physically closer to the current site location. Particle-size data indicate that when the shell-free deposit accumulated, the site was situated in a low-energy depositional zone, suggesting that the river channel had shifted further to the west during that period of time.

Microbial and mineral evolution in zero valent iron-based permeable reactive barriers during long-term operations

2015 ◽  
Vol 23 (6) ◽  
pp. 5960-5968 ◽  
Author(s):  
Naresh Kumar ◽  
Romain Millot ◽  
Fabienne Battaglia-Brunet ◽  
Enoma Omoregie ◽  
Perrine Chaurand ◽  
...  
Keyword(s):  
Permeable Reactive Barriers ◽  
Zero Valent Iron ◽  
Iron Based ◽  
Reactive Barriers
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