CATEGORY: PRODUCED WATER
Water Quality Research Journal of Canada In
Press, Uncorrected Proof, 2013, doi:10.2166/wqrjc.2013.118
Impact
of salinity on coagulation and dissolved air flotation treatment for oil and
gas produced water
Jessica M. Younker and Margaret E. Walsh
mwalsh2@dal.ca
Department of Civil and Resource Engineering, Dalhousie University, 1360
Barrington Street, Halifax, Nova Scotia
ABSTRACT
Produced water is a major wastewater stream in the oil and gas industry, typically
consisting of dispersed and dissolved oils, and high levels of salinity.
Despite
concerns that dissolved aromatics in produced water may be detrimental to
marine life, discharge regulations and treatment technologies for produced
water largely focus on dispersed oil and grease removal. Authors report on a
project designed to investigate coagulation with ferric chloride (FeCl3) and
dissolved air flotation (DAF) at bench-scale for the removal of both dispersed
and dissolved oils from synthetic and offshore produced water samples, with a
specific focus on the impact of salinity on the coagulation process.
Coagulation and DAF treatment of the produced water samples achieved
high removals of dispersed oil and grease, but had limited impact on dissolved
aromatics. The coagulation process in the saline produced water samples reduced
dispersed oil and grease concentrations from 100 mg/L to below North American
discharge limits under all test conditions, while the effectiveness of
coagulation treatment in the fresh water synthetic samples was highly dependent
on coagulation pH.
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