Patent ID: 6112675
Filing Date: 2000-09-05
Classification: B09B,B09C,C02F

Abstract:
A process for recovering and treating hazardous and non-hazardous components from process streams generated from a continuous system for selectively separating organic and inorganic constituents from contaminated material, said process comprising:(a) heating, in a dryer, the contaminated material to a first temperature sufficient to volatilize water and lower boiling point constituents contained in the material, thereby producing a dried solid material and a first gas containing water vapor and volatilized lower boiling point constituents;(b) separating the first gas from the dried solid material;(c) recovering the lower boiling point constituents from the first gas;(d) heating, in a desorber, the dried solid material to a second temperature sufficient to volatilize higher boiling point constituents contained in the dried material, thereby producing a substantially decontaminated solid material and a second gas containing volatilized higher boiling point constituents;(e) separating the second gas from the substantially decontaminated solid material;(f) recovering the higher boiling point constituents from the second gas;(g) heating the desorber with natural gas fired burners;(h) exhausting combustion products from the natural gas fired burners; and(i) feeding the exhausted combustion products in step (h) as sweep gas to at least one of (1) the dryer to assist in heating the contaminated material in step (a), and (2) the desorber to assist in heating the dried solid material and maintaining an appropriate partial pressure to effectively desorb contaminants in step (d).