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Oil and gas wastewater treatment--- Case study

Introdution• Oil and gas field wastewater is derived from the

petroleum and natural gas exploration. The water quality and quantity is relative to the process, exploration procedure and operation management. It mainly includes oil and gas field produced water, fracturing outlet liquid, drilling wastewater and some comprehensive wastewater.

• Oil-gas field wastewater contains very complex components, differing when exploration strata and mining process changes. But it has some common characteristics : as large amount of salt and gas dissolved in the wastewater, many kinds of chemicals are dosed into the wastewater, it contains oil, suspended solids, scaling ions, microorganisms.

Basic info• Project item: Gas field wastewater treatment for Beijing Huayou Energy Technology Co.,Ltd• Volume of treatment: 240m3/d • Raw water quality: wastewater of gas field• Water production quality requirement: Effluent water quality meets the discharge standard of pollutant: for municipal wastewater treatment plant （GB8978-1996 ） .

chroma(%) COD(mg/l) BOD(mg/l) ammonia nitrogen(mg/l) SS(mg/l) pH Oil(mg/l) sulfide(mg/l)

Discharge requirement ≤50 ≤100 ≤20 ≤15 ≤70 6-9 ≤5 ≤1

Water treatment process

• Dissolved air flotation process is used in this project as the main oil remover. Fenton agents are dosed to oxidize and break organic macromolecules. In the reuse process Germany MFT super RO membranes are used as the desalination membrane, for it withstands high salted wastewater. Effluent water quality meets the discharge standard of pollutant: for municipal wastewater treatment plant （ GB8978-1996 ） .

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