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GPP Oily water treatment

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Existing system

Oily water sources:

Open drain (surface water) to OWT

Water drain from SC, V-03 and V-07 to Burnpit Flare knockout drum (V-51) liquid to Burnpit

Oily water treatment:

API Oil Separator Y-71, Coalescer V-74 (for oilywater from open-drain only)

Burnpit (for oily water from closed-drain, flareknockout drum)

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Flow Diagram

Water sump

V-73

API Oil Separator

Y-71

Oil sump

V-71

Burnpit

Flare drum

V-51

Coalescer V-74

Flar

e

V-52

P-75 A/BP-74

P-51 A/B

Surface oily water

Flare header

Water

Clean water (15 ppm)

Oil tank

HC liquid

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Oily water treatment (OWT)

Surface oily water is collected through sewersystem to API Oil Separator (Y-71) to

separate Oil and Water Y-71 volume: 55.2 m3, design flow rate: 40

m3/hr and water purity: 30 ppm.

Separated Oil is stored in waste oil sump V-

71 (5.3 m3) can be take out by truck or burnat burnpit

Separated water in waste water sump V-73(45.4 m3) is feed to Coalescer (V-74) to

enhance the purity

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Coalescer V-74

To reduce the oil content of the API oilseparator up to 15 ppm or less

Equipped with renewable elements Stream condition:

Oil content 30 mg/l

Flow rate 40 m3/hr

Pressure 350 kPa Design code: ASME Sec.VIII.Div.I

Cartridge element: Fiberglass

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OWT Flow Diagram

Water sump

V-73

API Oil Separator

Y-71

Oil sumpV-71

Burnpit

Coalescer V-74

P-75 A/BP-74

Surface oily water

Clean water (15 ppm)

Oil tank

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Non-surface oily water

The 2 other sources of oily water:

Liquid from Flare knockout drum (V-51)

Flow rate: variable High HC content

Directly send to Burnpit

Water drain from SC, V-03 and V-07

Flow rate: estimated 8 m3/hr (maximum) HC content: unknown (still waiting for analysis)

Collect through header, flash at V-52 and bottom liquidsend to Burnpit

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OWT quality improvement

1. Reduce oily content of Coalescer (V-74)outlet to at least 5 ppm (according to TCVN)

Option 1: Change finer filters element

Clean OWT system (Y-71, V-71, V-73)

Additional chemical separation could be consider

Control the waste oil from maintenance works to

reduce inlet oily content of Y-71 Option 2:

Add new separation package (membrane, filter) serialwith V-74 to further purification.

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Burnpit handle improvement

2. Burnpit liquid handle (no more burning) Option 1:

Add a 3 phases separation equipment to handle liquidfrom V-51 bottom and V-52 bottom before sending toBurnpit.

Water from bottom of this drum will be send toBurnpit, HC vapor from top will be send to flare andthe rest will be store and take out by truck

Improve burnpit tip Option 2:

The liquid from V-51 and V-52 bottom will be send toOWT (Y-71) to handle.

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Water sump

V-73

API Oil Separator

Y-71

Oil sump

V-71

Burnpit

Flare drum

V-51

Coalescer V-74

Flar

e

V-52

P-75 A/B P-74

P-51 A/B

Surface oily water

Flare header

Water

Clean water (15 ppm)

Oil tank

HC liquid

Truck

Burnpit handle improvement