Physicochemical aspects of in situ surfactant washing of oil contaminated soils

2007 ◽  
pp. 125-129 ◽  
Author(s):  
T. Sobisch ◽  
L. Kühnemund ◽  
H. Hübner ◽  
G. Reinisch ◽  
J. Krägel
Keyword(s):  
Contaminated Soils

Mathematical Modeling of In Situ Vapor Stripping of Contaminated Soils

1990 ◽  
Vol 30 (3) ◽  
pp. 281-293
Author(s):  
David J. Wilson ◽  
Ann N. Clarke ◽  
Robert D. Mutch
Keyword(s):  
Mathematical Modeling ◽  
Contaminated Soils ◽  
Vapor Stripping

Comparison of the effectiveness of soil heating prior or during in situ chemical oxidation (ISCO) of aged PAH-contaminated soils

2017 ◽  
Vol 24 (12) ◽  
pp. 11265-11278 ◽  
Author(s):  
Bérénice Ranc ◽  
Pierre Faure ◽  
Véronique Croze ◽  
Catherine Lorgeoux ◽  
Marie-Odile Simonnot
Keyword(s):  
Contaminated Soils ◽  
Chemical Oxidation ◽  
Soil Heating ◽  
In Situ Chemical Oxidation

In situ multiphase fluidization ("upflow washing") for the remediation of hydrocarbon contaminated sands

1998 ◽  
Vol 35 (6) ◽  
pp. 938-960 ◽  
Author(s):  
Robert K Niven ◽  
Nasser Khalili
Keyword(s):  
Theoretical Analysis ◽  
Contaminated Soils ◽  
Fixed Bed ◽  
Fine Sand ◽  
In Situ Remediation ◽  
Pump And Treat ◽  
Wide Range ◽  
Phase Liquid ◽  
Regime Map

A new in situ remediation method is described, "upflow washing," in which contaminants are flushed to the surface within an in situ fluidized zone produced by a jet inserted into a granular formation. The suitability of the method for LNAPL (light non-aqueous phase liquid) remediation is examined by experiments on diesel-contaminated soils within column and tank settings. The experiments indicate significant reductions in diesel levels (96-99.9%) may be achieved by fluidization with water and gas (gas-liquid upflow washing, GLUW) for a wide range of initial diesel concentrations (10 000 to 150 000 mg/kg) and for soil fines contents of 0 to at least 10%. Final diesel levels of <1000 mg/kg in a uniform fine sand and <200 mg/kg in clayey sands can be achieved. The efficiency is much higher than that of fixed bed flushing (simulated pump-and-treat), as the method overcomes the trapping of NAPL ganglia. Fludization with water alone (liquid upflow washing, LUW) is less effective than fixed bed flushing in the uniform sand, but approaches that of GLUW in clayey and silty sands. The results are explained by theoretical analysis of the removability of isolated NAPL droplets and mixed solid - NAPL particles from a fluidized bed due to buoyancy and elutriation, which may be represented using a "removability regime map" for the diesel-water-sand system.Key words: fluidization, in situ, remediation, NAPL, diesel.

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