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Method and apparatus for processing oily wastewater

Patent ·
OSTI ID:6165965
;

A method of treating oily wastewater is described comprising the steps of passing oily wastewater through a coalescer to coalesce dispersed oil droplets; separating a free oil fraction as a liquid stream having a lower specific gravity from a contaminated water stream having a higher specific gravity; filtering particulate material from said contaminated water stream; passing the filtered water stream under pressure across an ultrafiltration membrane to separate a retentate fraction enriched in residual emulsified oil from an aqueous permeate fraction; recycling said substantially only retentate fraction to said coalescer; filtering said aqueous permeate through an activated carbon filter to remove low molecular weight organic materials; subjecting the filtrate from said activated carbon filter to cation exchange to remove heavy metal ions; and periodically flushing said ultra filter with filtrate from said particulate filter to maintain the permeability of said ultrafiltration membrane.

Assignee:
Madison Chemical Co., Inc., IN (United States)
Patent Number(s):
A; US 5227071
Application Number:
PPN: US 7-822144
OSTI ID:
6165965
Country of Publication:
United States
Language:
English

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Related Subjects

02 PETROLEUM
020900* -- Petroleum-- Environmental Aspects
32 ENERGY CONSERVATION, CONSUMPTION, AND UTILIZATION
320305 -- Energy Conservation
Consumption
& Utilization-- Industrial & Agricultural Processes-- Industrial Waste Management
54 ENVIRONMENTAL SCIENCES
540220 -- Environment
Terrestrial-- Chemicals Monitoring & Transport-- (1990-)
540320 -- Environment
Aquatic-- Chemicals Monitoring & Transport-- (1990-)
ACTIVATED CARBON
ADSORBENTS
CARBON
CLEANING
COALESCENCE
DECONTAMINATION
DESIGN
ELEMENTS
FILTERS
FILTRATION
HAZARDOUS MATERIALS SPILLS
HYDROGEN COMPOUNDS
ION EXCHANGE
LIQUID WASTES
MANAGEMENT
MATERIALS RECOVERY
MEMBRANES
METALS
NONMETALS
OIL SPILLS
OILS
ORGANIC COMPOUNDS
OTHER ORGANIC COMPOUNDS
OXYGEN COMPOUNDS
PERMEABILITY
PROCESSING
RECYCLING
SEPARATION EQUIPMENT
SEPARATION PROCESSES
WASTE MANAGEMENT
WASTE PROCESSING
WASTE WATER
WASTES
WATER