Process of dressing contaminated soils

Details Process of dressing contaminated soils Process of dressing contaminated soils

1988-10-20

1990-11-13

Reese, Randolph A.

Hydraulic and earth engineering

Soil remediation

In situ contaminant removal or stabilization

210259, 210767, 210768, 210806, 210908, B08B 310, B08B 304

Patent

active

049697757

ABSTRACT:
For a separation into a purified fraction and a polluant concentrate, contaminated soils are ground in a drum to which loose pieces acting like grinding elements have been added and with a net energy input of 4 to 16 kWh per 1000 kg throughput. The speed is 50 to 90% of the critical speed ##EQU1## The suspension discharged from the drum is separated by sieving into a relatively coarse fraction and a relatively fine fraction. The relatively coarse fraction is discharged as a purified fraction and the relatively fine fraction is desludged. The separated sludge is dewatered and is subsequently delivered as a polluant concentrate. The desludged remainder of the finer fraction is dewatered and is subsequently delivered as purified soil.

REFERENCES:
patent: 3888193 (1975-06-01), Nishigami et al.
patent: 4244531 (1981-01-01), Szegvari
patent: 4253408 (1981-03-01), Kramer
patent: 4424081 (1984-01-01), Giguere
patent: 4606774 (1986-08-01), Morris
patent: 4675902 (1988-08-01), Ely et al.
patent: 4783263 (1988-11-01), Trost et al.
patent: 4801384 (1989-01-01), Steiner
"Initial Testing of Pilot Scale Equipment for Soil Decontamination", U.S. D.O.E. RFP-3022, 10/17/80.

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