Method for in-situ reduction of PCB-like contaminants from concr

Details Method for in-situ reduction of PCB-like contaminants from concr Method for in-situ reduction of PCB-like contaminants from concr

1994-07-05

1997-04-22

Walberg, Teresa J.

Electric heating

Heating devices

With heating unit structure

588 10, 219213, 219535, H05B 308, H05B 100, G21F 900

Patent

active

056226411

ABSTRACT:
A method for decontaminating of concrete and more specifically to methods used for in-situ thermal desorption of contaminants from concrete, such as PCBs is disclosed. The methods employed heat the concrete at reduced pressure and at a temperature sufficient to volatilize and draw off the contaminant vapors so that the concrete is decontaminated to greater depth than previously obtained, that no concrete waste is created which requires disposal, that the methods produce no secondary liquid waste, that no chemical agents are required, that the decontaminated concrete material can be reused, that the methods are safer for workers because there is no contaminated dust formed during the process and specifically that the process produce a low energy cost per unit area decontamination for the concrete.

REFERENCES:
patent: 4984594 (1991-01-01), Vinegar et al.
patent: 5193934 (1993-03-01), Johnson et al.
patent: 5209604 (1993-05-01), Chou
patent: 5221827 (1993-06-01), Marsden, Jr. et al.
patent: 5229583 (1993-07-01), Van Egmond et al.
patent: 5233164 (1993-08-01), Dicks et al.
patent: 5283010 (1994-02-01), Waring
patent: 5425072 (1995-06-01), Li et al.

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