Removal of dioxins, PCB's and other halogenated organic compounds from wastewater

Patent · Tue Nov 18 00:00:00 EST 1986

OSTI ID:6943610

Ying, W C; Sojka, S A

This patent describes the combination of physicochemical and biological treatment processes for removing dioxins, PCB's, and other halogenated organic compounds from raw wastewater, in a pretreatment zone to produce pretreated wastewater still containing minor proportions, of dioxins and PCB's and then in a reaction zone wherein final effluent is produced. This comprises the physiocochemical process consisting of subjecting the raw wastewater to simultaneous neutralization and oxidation, followed by separating precipitated products, which precipitated products have adsorbed a major proportion of at least 90% of the dioxins and PCB's present in the raw wastewater in the same pretreatment zone. It is then followed by biological treatment process consisting of subjecting the pre-treated wastewater, which contains the minor proportion of dioxins and PCB's, and other halogenated organic compounds in raw wastewater, to a combined powdered active carbon adsorption and biological treatment process in a sequencing batch reactor in the presence of acclimated activated sludge. This process comprises the steps FILL, REACT, SETTLE, DRAW, and IDLE. The combined treatment process operates at a mixed liquor suspended solids concentration in excess of 5000 mg/L, and wherein the amount of powdered active carbon is added during the FILL and/or REACT steps and is sufficient to produce a final effluent free of dioxins and PCB's containing less than 0.8 ppt and less than 2.0 ppb, respectively, and substantially free of other halogenated organic compounds, and disposing of waste sludge in a secure landfill.

• Assignee: Occidental Chemical Corp., Niagara Falls, NY
• Patent Number(s): US 4623464
• OSTI ID: 6943610
• Resource Relation: Patent File Date: Filed date 21 Mar 1985
• Country of Publication: United States
• Language: English

Related Subjects

54 ENVIRONMENTAL SCIENCES
CHLORINATED AROMATIC HYDROCARBONS
REMOVAL
WATER POLLUTION CONTROL
DIOXIN
WASTE WATER
PURIFICATION
ACTIVATED CARBON
ADSORPTION
BIOCHEMISTRY
CHEMICAL REACTION YIELD
CHEMICAL REACTORS
HALOGENATION
OXIDATION
PH VALUE
PHYSICAL CHEMISTRY
PRECIPITATION
SANITARY LANDFILLS
WASTE DISPOSAL
ADSORBENTS
AROMATICS
CARBON
CHEMICAL REACTIONS
CHEMISTRY
CONTROL
ELEMENTS
HALOGENATED AROMATIC HYDROCARBONS
HETEROCYCLIC COMPOUNDS
HYDROGEN COMPOUNDS
LIQUID WASTES
MANAGEMENT
NONMETALS
ORGANIC CHLORINE COMPOUNDS
ORGANIC COMPOUNDS
ORGANIC HALOGEN COMPOUNDS
ORGANIC OXYGEN COMPOUNDS
OXYGEN COMPOUNDS
POLLUTION CONTROL
SEPARATION PROCESSES
SORPTION
WASTE MANAGEMENT
WASTES
WATER
YIELDS
520200* - Environment
Aquatic- Chemicals Monitoring & Transport- (-1989)