Japan Geoscience Union Meeting 2015

Presentation information


Symbol A (Atmospheric and Hydrospheric Sciences) » A-HW Hydrology & Water Environment

[A-HW25] Groundwater and environmental geology in urban areas

Wed. May 27, 2015 2:15 PM - 4:00 PM 101B (1F)

Convener:*Masaya Yasuhara(Geological Survey of Japan, AIST), Takeshi Hayashi(Faculty of Education and Human Studies, Akita University), Motoyuki Asada(Shimizu Corporation), Satoshi Takizawa(Department of Urban Engineering, Graduate School of Engineering, the University of Tokyo), Hiroaki SUZUKI(Strategic Technology Development Dept. Research & Development Center, Nippon Koei Co., Ltd.), Kei Nishida(Interdisciplinary Graduate School of Medicine and Engineering, the University of Yamanashi), Chair:Kei Nishida(Interdisciplinary Graduate School of Medicine and Engineering, the University of Yamanashi), Masaya Yasuhara(Geological Survey of Japan, AIST)

3:20 PM - 3:35 PM

[AHW25-05] Removal of very fine oil particles from produced water by microbubble flotation in conjunction with coagulation technic

*Keisuke KOJIMA1, Masaharu TASAKI1, Kazuo OKAMURA2, N., Sueyoshi MARK1, S., Al-maamari RASHID3 (1.SHIMIZU CORPORATION, 2.TECNET Co. Ltd, 3.Sultan Qaboos University)

Keywords:produced water, microbubble flotation, coagulation/flocculation, oil removal

During the oil production process, oily waste water is coproduced at a rate several times that of oil. This water is known as produced water. Most produced water requires treatment to prevent groundwater contamination because it contains very fine oil particles as dispersed and dissolved oil, which are very difficult to separate by gravity separation. It also contains heavy metals, boron, corrosive fluids such as H2S, and other chemicals. The treatment and disposal of produced water is a significant operating expense for oil and gas companies. Therefore, treatment levels and technologies are selected based on disposal method or reutilization objectives, environmental impacts, economics, and other such factors.
A 50 m3/day capacity pilot plant was designed, fabricated, and utilized to conduct produced water treatment trials in Oman. Pilot treatment trials of produced water from three different oilfields in Oman were carried out by nitrogen microbubble flotation in conjunction with coagulation/flocculation. Filtration and adsorption treatment processes were tested as advanced process for reutilization objectives.
Oil concentration in one of the produced waters was reduced to below the Omani standard for re-use, through microbubble flotation combined with coagulation/flocculation treatment. Oil concentrations in the other two produced waters, which had higher-initial concentrations, were reduced to below the Omani standard for marine discharge. With additional adsorption treatment, these concentrations were further reduced of the level of the re-use standard as well.
Additionally, aeration treatment was effective for removal of sulfur compounds such as sulfide from produced water.