Title:
【発明の名称】精油所排出物の処理方法
Document Type and Number:
Japanese Patent JP2001523557
Kind Code:
A
Abstract:
Refinery waste feedstock is screened to remove large particles and is diluted to less than 5% solids weight percent to form a slurry. The slurry is agitated and heated to 180 DEG F. or higher for a time sufficient to melt waxy petroleum solids, reduce the viscosity of the slurry, reduce the density of petroleum fractions within the slurry, and begin to break surface adhesion of petroleum to residual fines. The conditioned slurry is passed through a first disc/bowl centrifuge which separates more than 80% of the waste volume as a first liquid effluent containing most of the petroleum fractions from the original waste and which may be returned to the refinery for processing. The residual cake is diluted with hot water to form a second slurry and is treated with an amount of hydrogen peroxide for a time sufficient to lyse and/or liberate residual petroleum bound to inert fine particles and to oxidize toxic polycyclic aromatic hydrocarbons to non-toxic derivatives. The second slurry is passed through a second disc/bowl centrifuge, yielding a second liquid effluent which may be combined with the first liquid effluent. The residual cake, containing about 0.5% or less petroleum and about 70% solids, may be landfilled directly or further dewatered as needed to meet disposal requirements.
Inventors:
Connor Way, Lawrence M
Application Number:
JP2000520920A
Publication Date:
November 27, 2001
Filing Date:
November 16, 1998
Export Citation:
Assignee:
Continuum Environmental Incorporated
International Classes:
B09B5/00; B01D21/26; B03B9/02; B09C1/00; B09C1/02; B09C1/08; C10G27/12; C10G31/06; C10G31/10; C10G53/02; (IPC1-7): B09B5/00; B01D21/26
Attorney, Agent or Firm:
Takehiko Saito (1 outside)