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Yeh > Sewege Treatment Plant > Flashcards

Sewege Treatment Plant Flashcards

1
Q

What is Black Water

A

Drainage and waste from:
WCs
WC Scuppers
Urinals
Medical Compartments

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2
Q

What is Grey Water

A

Drainage doesnt require treatment to discharge

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3
Q

Where does Grey Water come from?

A

Dishwashers
Launderies
Bathrooms
Galleys
Sinks

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4
Q

0-4NM

A

IMO approved sewege treatment plant

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5
Q

4-12NM

A

IMO approved system to disinfect discharge (chlorine)

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6
Q

12NM

A

No treatment needed

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7
Q

Advantages of having STP on board

A

Simplify pipe runs

Heads and Bathrooms lower in deck

Heads and Bathrooms used in drydock

Operate in anti pollution area

Reduce ship side openings

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8
Q

Aerobic Digestion

A

Air supply is bubbled through slurry to encourage digestion from microorganisms

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9
Q

Anaerobic Digestion

A

If aerobic fails, micro organisms die, produce hydrogen sulphide

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10
Q

How would you detect anaerobic digestion at low levels

A

The smell (rotten eggs)

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11
Q

What causes anaerobic digestion on biological stp

A

Flushing wrong things down the toilet that cant go through the stp

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12
Q

Purpose of coarse screen

A

Removes large matter that has bypassed the macerator

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13
Q

Purpose of primary

A

Air lifts the slurry from the aeration compartment into settlement hopper

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14
Q

Purpose of secondary air lift

A

Thick matter sinks to the bottom, and goes through the sludge return back into aeration compartment to be more diluted

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15
Q

Purpose of aeration diffuser

A

Sens air from aeration compartment to begin aeration digestion

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16
Q

0.03ppm

A

Odor

17
Q

150-400ppm

A

Less of smell, dizziness, nausea

18
Q

1000+ppm

A

Immediate unconciousness
Seconds until death

19
Q

Hazards associated with raw sewege

A

Hepatitis
Typhoid
Gastro Enteritis

20
Q

Hazards associated with STP

A

Chlorine
H2S
Methane

21
Q

How does the collect hold and transfer tanks

A
  1. Vaccums suck slurry into collection tanks via soil in pipes
  2. Collection Tank can hold slurry for up to a day
  3. Transfer pump moves slurry into holding tanks
  4. Holding Tanks can hold slurry for up to 12 days
  5. Recirculating pump moves slurry through the ejector, back into the holding tanks, ready to be discharged
  6. The ejector prevents anaerobic respiration, and works with bernoullis theorem
  7. Slurry is discharged through High Discharge at port, or Low Discharge at sea
22
Q

VPS

A

Vaccum Pump System

23
Q

What does VPS consist of

A

Hoses, Manifolds, Diesel Pumps

Yeh (6 decks)

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