Chromium removal from cooling water blowdown

Conference · Mon Jan 01 04:00:00 EST 1979 · 86th AICHE Natl. Meet.; (United States)

OSTI ID:6705584

Skinner, W M; Porter, G L

Chromium removal from cooling water blowdown at the olefin and polyolefin complex of Gulf Oil Chemicals Co. at Cedar Bayou, Tex., reduces the chromium content from 9.7 to 0.4 mg/l. and zinc from 1-2 to 0.1 mg/l. The treatment involves reduction of hexavalent chromium to trivalent chromium with excess sulfur dioxide and enough 93Vertical Bar3< sulfuric acid to keep the pH below 3.0, addition of 40Vertical Bar3< lime slurry to raise the pH to 8.5 and precipitate chromium and zinc hydroxides and calcium salts, addition of approx. 0.5-1.0 ppm of a high-molecular anionic polymer to aid in flocculation and clarification, addition of 0.32Vertical Bar3< by wt solution of a high-molecular anionic polymer at a rate of 8-12 lb/ton of dry sludge to the sludge from the clarifier, and centrifuging to produce 80,000 lb/mo of sludge containing 16Vertical Bar3< solids. About 66 lb of dry sludge containing approx. 7 lb chromium and 2 lb of zinc are generated per 1,000,000 lb of blowdown. The sludge is disposed of by a contract hauler to an approved landfill.

• Research Organization: Gulf Oil Chem. Co.
• OSTI ID: 6705584
• Report Number(s): CONF-790405-
• Conference Information: Journal Name: 86th AICHE Natl. Meet.; (United States) Journal Volume: 796
• Country of Publication: United States
• Language: English

Related Subjects

02 PETROLEUM
020800* -- Petroleum-- Waste Management
BLOWDOWN
CHEMICAL PLANTS
CHROMIUM
CONCENTRATION RATIO
COOLANTS
DATA
ELEMENTS
HYDROGEN COMPOUNDS
INDUSTRIAL PLANTS
INFORMATION
MANAGEMENT
METALS
NUMERICAL DATA
OXYGEN COMPOUNDS
PETROCHEMICAL PLANTS
REMOVAL
TRANSITION ELEMENTS
WASTE DISPOSAL
WASTE MANAGEMENT
WATER
ZINC