Speciation of Fe and As in cored sediments from an As-contaminated aquifer in Bangladesh

This paper reviews ten years of research on on-site and in situ bioremediation of chlorophenol contaminated groundwater. Laboratory experiments on the development of a high-rate, fluidized-bed process resulted in a full-scale, pump-and-treat application which has operated for several years. The system operates at ambient groundwater temperature of 7 to 9°C at 2.7 d hydraulic retention time and chlorophenol removal efficiencies of 98.5 to 99.9%. The microbial ecology studies of the contaminated aquifer revealed a diverse chlorophenol-degrading community. In situ biodegradation of chlorophenols is controlled by oxygen availability, only. Laboratory and pilot-scale experiments showed the potential for in situ aquifer bioremediation with iron oxidation and precipitation as a potential problem.

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Remediation of PCE-contaminated aquifer by an in situ two-layer biobarrier: laboratory batch and column studies

Water Research ◽

10.1016/s0043-1354(02)00254-3 ◽

2003 ◽

Vol 37 (1) ◽

pp. 27-38 ◽

Cited By ~ 62

Author(s):

C.M Kao ◽

S.C Chen ◽

J.Y Wang ◽

Y.L Chen ◽

S.Z Lee

Keyword(s):

Column Studies ◽

Contaminated Aquifer

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Multi-objective optimization for optimal extraction of groundwater from a nitrate-contaminated aquifer considering economic-environmental issues: A case study

Journal of Contaminant Hydrology ◽

10.1016/j.jconhyd.2021.103806 ◽

2021 ◽

pp. 103806

Author(s):

Maryam Mirzaee ◽

Hamid R. Safavi ◽

Masoud Taheriyoun ◽

Farshad Rezaei

Keyword(s):

Environmental Issues ◽

Multi Objective Optimization ◽

Contaminated Aquifer ◽

Multi Objective

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Assessment of the management scenarios for groundwater quality remediation of a nitrate-contaminated aquifer

Environmental Monitoring and Assessment ◽

10.1007/s10661-021-08978-3 ◽

2021 ◽

Vol 193 (4) ◽

Author(s):

Mahsa Samadi-Darafshani ◽

Hamid R. Safavi ◽

Mohammad H. Golmohammadi ◽

Farshad Rezaei

Keyword(s):

Groundwater Quality ◽

Management Scenarios ◽

Contaminated Aquifer

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Removal of heavy metal from soil and groundwater by in-situ electrokinetic remediation

Water Science & Technology ◽

10.2166/wst.2000.0586 ◽

2000 ◽

Vol 42 (7-8) ◽

pp. 335-343 ◽

Cited By ~ 4

Author(s):

S. Shiba ◽

S. Hino ◽

Y. Hirata ◽

T. Seno

Keyword(s):

Heavy Metals ◽

Heavy Metal ◽

Electric Potential ◽

Potential Gradient ◽

Electrokinetic Remediation ◽

Contaminated Aquifer ◽

Physico Chemical ◽

Operational Variables ◽

Mass Transport Process

The operational variables of electrokinetic remediation have not been cleared yet, because this method is relatively new and is an innovative technique in the aquifer remediation. In order to investigate the operational variables of the electrokinetic remediation, a mathematical model has been constructed based on the physico chemical mass transport process of heavy metals in pore water of contaminated aquifer. The transport of the heavy metals is driven not only by the hydraulic flow due to the injection of the purge water but also by the electromigration due to the application of the electric potential gradient. The electric potential between anode and cathode is the important operational variable for the electrokinetic remediation. From the numerical simulations with use of this model it is confirmed that the remediation starts from the up stream anode and gradually the heavy metal is transported to the down stream cathode and drawn out through the purge water.

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