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Resume of total operation of waste treatment facility for animal and vegetable oil refinery
Author(s) -
Seng W. C.,
Kreutzer G. M.
Publication year - 1975
Publication title -
journal of the american oil chemists' society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.512
H-Index - 117
eISSN - 1558-9331
pISSN - 0003-021X
DOI - 10.1007/bf02641427
Subject(s) - effluent , oil refinery , waste management , environmental science , refinery , chemical oxygen demand , suspended solids , pulp and paper industry , environmental engineering , sewage treatment , wastewater , engineering
A 2 year study in cooperation with the U.S. Environmental Protection Agency has been conducted to define and treat effluent from one of Swift’s edible oil refineries. As a result of this study, the existing treatment system was modified to produce effluent suitable for discharge to the Kankakee, Ill., sanitary district and at the same time eliminate surcharges and the need for a lagoon. The treatment system consists of a skim tank which is cathodically protected, automatic pH and chemical addition control, and an air flotation cell also cathodically protected. Provisions also were made to recover the inedible oil for sale as a by‐product. The skimmings from the skim tank and from the air flotation cell are acid treated, heated, and centrifuged to recover 7–10,000 lb/day of inedible oil. Sale of recovered inedible oil can cover 60–80% of the direct costs of operation of the waste treatment system. Recent improvements in the system have reduced the cost of treatment even further and rasied effluent quality. With impressed current and chemicals, the biochemical oxygen demand is reduced from 3300 to 150, fats, oils, and greases from 2500 to 75, and suspended solids from 3000 to 150 ppm.