scholarly journals EFFECTS OF IN-SITU BIOREMEDIATION WITH GROUNDWATER CIRCULATION SYSTEM ON GROUNDWATER REMEDIATION OF CHLORINATED ETHENES

2014 ◽  
Vol 70 (4) ◽  
pp. I_1117-I_1122
Author(s):  
Hiroshi MARUYAMA ◽  
Nobuyuki EGUSA ◽  
Tatemasa HIRATA ◽  
Keiichiro KAWAHARA
Keyword(s):  
Groundwater Remediation ◽  
Chlorinated Ethenes ◽  
Circulation System ◽  
Groundwater Circulation

APPLICATION OF NANOSCALE ZERO-VALENT IRON FOR GROUNDWATER REMEDIATION: LABORATORY AND PILOT EXPERIMENTS

NANO ◽  
2008 ◽  
Vol 03 (04) ◽  
pp. 287-289 ◽  
Author(s):  
STEPANKA KLIMKOVA ◽  
MIROSLAV CERNIK ◽  
LENKA LACINOVA ◽  
JAROSLAV NOSEK
Keyword(s):  
Heavy Metals ◽  
Groundwater Remediation ◽  
Laboratory Experiments ◽  
Permeable Reactive Barriers ◽  
Zero Valent Iron ◽  
Chlorinated Ethenes ◽  
Soluble Form ◽  
Chemical Decontamination ◽  
Nanoscale Zero Valent Iron

It is known that the reductive effects of zero-valent iron ( Fe 0) and the sorptive capability of iron and its oxides can be used for both the dehalogenation of chlorinated hydrocarbons (CHC), especially of chlorinated ethenes (PCE → TCE → DCE → VC → ethene, ethane), and the removing of heavy metals from groundwater by turning them into a less-soluble form through changes of their oxidation state, or by adsorption. These consequences are being exploited in the construction of iron filling permeable reactive barriers for a longer time.1 The advantages of nanoscale zero-valent iron ( nanoFe 0) over the macroscopic one consist not only in the better reactivity implicit in their greater specific surface area but also in their mobility in rock environment.2,3 Numerous laboratory experiments, especially the batch-agitated experiments, with samples from seven various contaminated localities in Europe have been carried out with the aim to discover the measurement of the reductive effect of the nanoFe 0 on selected contaminants. It was found that the nanoFe 0 can be reliably usable as a reductive reactant for in-situ chemical decontamination of sites polluted by chlorinated ethenes (CEs), or hexa-valent chromium ( Cr VI ). The rate of reductive reaction and the optimal concentrations for the real remediation action were determined. On the basis of these laboratory experiments, the methods for pilot application of nanoFe 0 have been specified. Subsequently the pilot experiments were accomplished in surveyed localities.

scholarly journals Autonomous screening of groundwater remediation technologies in the subsurface using the In Situ Microcosm Array (ISMA)

2019 ◽  
Vol 367 ◽  
pp. 668-675 ◽  
Author(s):  
Tomasz Kalinowski ◽  
Kristin McClellan ◽  
Thomas A. Bruton ◽  
Rosa Krajmalnik-Brown ◽  
Erin M. Driver ◽  
...  
Keyword(s):  
Groundwater Remediation

scholarly journals The groundwater flow system of Terme Alte (Alto Reno Terme, Bologna, Italy)

2020 ◽  
Author(s):  
Alessandro Gargini ◽  
Alessandro Stefani ◽  
Stefano Vannini
Keyword(s):  
Chemical Properties ◽  
Hydrological Regime ◽  
Past Research ◽  
Mineral Deposit ◽  
Thermal Waters ◽  
Circulation System ◽  
Left Bank ◽  
Aquifer System ◽  
Hydrogeological Parameters ◽  
Groundwater Circulation

The thermal field of Porretta Terme, located in the Alto Reno Terme municipality (Bologna), has always raised interest for its peculiar waters since ancient times. Indeed, the use of the springs dates back to the I-II century A.D. and perhaps even in the Etruscan period. Porretta’s thermal tradition has developed over the centuries. First regulation, issued in 1936, allowed to cultivate the mineral deposit and its natural gas in a 740 000 acres wide land. The thermal waters, a public good, are indeed ruled by specific laws which control their use through a grant where the Public Authority makes the licensee, usually a private, follow a series of accomplishments aimed at not damaging the quantitative and qualitative characteristics (R.D. July 29, 1927 n. 1443). Fourteen thermo-mineral springs out of the nineteen located in the given land are currently exploited. They are divided into two groups, which differentiate either for the chemical properties of the waters and their topographic location. The first group of springs, called salt-bromoiodic, with higher salinity and temperature, is located in the upper part of Porretta along the Rio Maggiore, a tributary on the left bank of the Reno River. This is the portion of the deposit that has been studied. The second group of springs, called sulphurous, characterized by lower temperatures and salinity, is located south-east Porretta on the left side of the Reno River. These thermo-mineral water resources appear to be very worthy and need particular care and protection. By using the results of past research, the essential bibliography of which has been edited in the end-notes, the aim was to develop the hydrogeological parameters of the aquifer that feeds the thermo-mineral sources, identify and understand the conceptual model of the groundwater circulation system, also detecting the interference between the different sources in the area examined. This type of research, which is usually applied to aquifers in sedimentary and granular soils, can be considered original. Indeed, an exhaustive hydrodynamic parameterization of a fractured thermal aquifer system such as that of Porretta has never been conducted. The collection of observational data on the hydrological regime and on the chemical composition of hot waters during the six months of field surveys, which confirmed the substantial constancy of the values over time, was also remarkable.

Groundwater Remediation of Hexavalent Chromium Along the Columbia River at the Hanford Site in Washington State, USA

2011 ◽  
Author(s):  
Dyan L. Foss ◽  
Briant L. Charboneau
Keyword(s):  
Hexavalent Chromium ◽  
Groundwater Remediation ◽  
Columbia River ◽  
Washington State ◽  
Department Of Energy ◽  
Hanford Site ◽  
Pump And Treat ◽  
Environmental Setting ◽  
Calcium Polysulfide

The U.S. Department of Energy Hanford Site, formerly used for nuclear weapons production, encompasses 1500 square kilometers in southeast Washington State along the Columbia River. A principle threat to the river are the groundwater plumes of hexavalent chromium (Cr(VI)), which affect approximately 9.8 square kilometers, and 4.1 kilometers of shoreline. Cleanup goals are to stop Cr(VI) from entering the river by the end of 2012 and remediate the groundwater plumes to the drinking water standards by the end of 2020. Five groundwater pump-and-treat systems are currently in operation for the remediation of Cr(VI). Since the 1990s, over 13.6 billion L of groundwater have been treated; over 1,435 kg of Cr(VI) have been removed. This paper describes the unique aspects of the site, its environmental setting, hydrogeology, groundwater-river interface, riverine hydraulic effects, remediation activities completed to date, a summary of the current and proposed pump-and-treat operations, the in situ redox manipulation barrier, and the effectiveness of passive barriers, resins, and treatability testing results of calcium polysulfide, biostimulation, and electrocoagulation, currently under evaluation.

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