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Title: Removal of emulsified oil with organic coagulants and dissolved air flotation (DAF)

Abstract

Laboratory and pilot-plant studies were conducted on the removal of emulsified oil from refinery wastewater by DAF, e.g., to evaluate the use of organic surface active agents and polyelectrolytes as coagulants. The best polyelectrolyte was 75% charged polydiallyldimethylammonium compound cationic polyelectrolyte WT 2640 in pH range 7.0-8.5. The optimum dose, 15 mg/l., was independent of emulsified oil concentration or composition in the range 200-2000 mg/l. WT 2640 performed reliably under a wide variety of input conditions with DAF effluent oil concentrations averaging 10 mg/l. The concentration of oil in the DAF scum was on the order of 50% by wt and the removed oil was easily scraped from the surface of the air flotation chamber. The use of polyelectrolytes seems to be economically promising if the oil recovered can be reprocessed in the refinery. Preliminary results showed that the quickest capture of oil droplets by an air bubble occurred when the rate of oil droplet coagulation was most rapid, i.e., the point of zero net charge in the oil droplets. Thus, good coagulation also means good removal of oil in the DAF process.

Authors:
 [1]; ;
  1. Carnegie-Mellon Univ.
Publication Date:
OSTI Identifier:
5054668
Resource Type:
Journal Article
Journal Name:
J. - Water Pollut. Control Fed.; (United States)
Additional Journal Information:
Journal Volume: 50:2
Country of Publication:
United States
Language:
English
Subject:
02 PETROLEUM; PETROLEUM; RECOVERY; PETROLEUM REFINERIES; WASTE WATER; FLOTATION; FLOCCULATION; PILOT PLANTS; WATER POLLUTION CONTROL; CONTROL; ENERGY SOURCES; FOSSIL FUELS; FUELS; FUNCTIONAL MODELS; HYDROGEN COMPOUNDS; INDUSTRIAL PLANTS; LIQUID WASTES; OXYGEN COMPOUNDS; POLLUTION CONTROL; PRECIPITATION; SEPARATION PROCESSES; WASTES; WATER; 020800* - Petroleum- Waste Management

Citation Formats

Luthy, R G, Selleck, R E, and Galloway, T R. Removal of emulsified oil with organic coagulants and dissolved air flotation (DAF). United States: N. p., 1978. Web.
Luthy, R G, Selleck, R E, & Galloway, T R. Removal of emulsified oil with organic coagulants and dissolved air flotation (DAF). United States.
Luthy, R G, Selleck, R E, and Galloway, T R. 1978. "Removal of emulsified oil with organic coagulants and dissolved air flotation (DAF)". United States.
@article{osti_5054668,
title = {Removal of emulsified oil with organic coagulants and dissolved air flotation (DAF)},
author = {Luthy, R G and Selleck, R E and Galloway, T R},
abstractNote = {Laboratory and pilot-plant studies were conducted on the removal of emulsified oil from refinery wastewater by DAF, e.g., to evaluate the use of organic surface active agents and polyelectrolytes as coagulants. The best polyelectrolyte was 75% charged polydiallyldimethylammonium compound cationic polyelectrolyte WT 2640 in pH range 7.0-8.5. The optimum dose, 15 mg/l., was independent of emulsified oil concentration or composition in the range 200-2000 mg/l. WT 2640 performed reliably under a wide variety of input conditions with DAF effluent oil concentrations averaging 10 mg/l. The concentration of oil in the DAF scum was on the order of 50% by wt and the removed oil was easily scraped from the surface of the air flotation chamber. The use of polyelectrolytes seems to be economically promising if the oil recovered can be reprocessed in the refinery. Preliminary results showed that the quickest capture of oil droplets by an air bubble occurred when the rate of oil droplet coagulation was most rapid, i.e., the point of zero net charge in the oil droplets. Thus, good coagulation also means good removal of oil in the DAF process.},
doi = {},
url = {https://www.osti.gov/biblio/5054668}, journal = {J. - Water Pollut. Control Fed.; (United States)},
number = ,
volume = 50:2,
place = {United States},
year = {Wed Feb 01 00:00:00 EST 1978},
month = {Wed Feb 01 00:00:00 EST 1978}
}