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Electrocoagulation with polarity switch for fast oil removal from oil in water emulsions
- Source :
- Journal of Environmental Management. 213:119-125
- Publication Year :
- 2018
- Publisher :
- Elsevier BV, 2018.
-
Abstract
- An electrocoagulation technique using a 3.5 L reactor, with aluminum electrodes in a monopolar arrangement with polarity switch at each 10 s was used to separate oil from synthetic oily water similar in oil concentration to produced water from offshore platforms. Up to 98% of oil removal was achieved after 20 min of processing. Processing time dependence of the oil removal and pH was measured and successfully adjusted to exponential models, indicating a pseudo first order behavior. Statistical analysis was used to prove that electrical conductivity and total solids depend significantly on the concentration of electrolyte (NaCl) in the medium. Oil removal depends mostly on the distance between the electrodes but is proportional to electrolyte concentration when initial pH is 8. Electrocoagulation with polarity switch maximizes the lifetime of the electrodes. The process reduced oil concentration to a value below that stipulated by law, proving it can be an efficient technology to minimize the offshore drilling impact in the environment.
- Subjects :
- Environmental Engineering
Materials science
Polarity (physics)
medicine.medical_treatment
Batch reactor
02 engineering and technology
Electrolyte
010501 environmental sciences
Management, Monitoring, Policy and Law
01 natural sciences
Electrocoagulation
Water Purification
Electrical resistivity and conductivity
medicine
Electrodes
Waste Management and Disposal
0105 earth and related environmental sciences
Polarity reversal
General Medicine
Hydrogen-Ion Concentration
021001 nanoscience & nanotechnology
Produced water
Chemical engineering
Electrode
Emulsions
0210 nano-technology
Oils
Water Pollutants, Chemical
Aluminum
Subjects
Details
- ISSN :
- 03014797
- Volume :
- 213
- Database :
- OpenAIRE
- Journal :
- Journal of Environmental Management
- Accession number :
- edsair.doi.dedup.....376c8a48264158768513bc7e3e19d971