Skimmers and remediation pumps - Surechem · Skimmers and remediation pumps. 2 ... What is a...
Transcript of Skimmers and remediation pumps - Surechem · Skimmers and remediation pumps. 2 ... What is a...
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� Skimmers and remediation pumps are meant to remove liquid pollution from groundwater
Remediation pumps
Tapa EstlandVillager literally sees water burning. Kerosine from a nearby old military airfieldis floating on the groundwater
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� The “liquid” can be either
• The polluted groundwater itself and / or
• An oil-like liquid or solvent “floating” on the groundwater
– Also called Light Non-Aqeous Phase Liquid or LNAPL
• A solvent at the lowest level in a groundwater filled borehole
– Also called Dense Non-Aqeous Phase Liquid or DNAPL
Remediation pumps
LNAPL
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� Groundwater pollution; DNAPL and LNAPL
Remediation pumps
Leakage from anoil drum resulting in pure LNAPL ongroundwater
Pure DNAPL solvent onimpermeable layer
Pollutedgroundwater
Polluted soilgas
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� What is a skimmer
• A skimmer skims oil from water.
• There are two methods:
– With a floating filter
– With a float
Skimmer
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� Float or filter
• Float or filter can move up and down to follow fluctuations of the water table with range 0,5 m (or 1 m)
• Float is used for maximum flow but leaves an oil layer of 2.5 cm
• Filter is used to clean the last oil down to 0.25 mm
Skimmer
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� Float or filter
• Float floats ON water but is submerged in oil. Result: Oil is collected only
Skimmer
water
LNAPL
Oil outletto pump
Oil inlet
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� Hydrophobic filter
• Filter floats in water with hydrophobic sieve section in the oil layer. Only oil is collected
• Works down to 0.25 mm LNAPL layer
Skimmer
water
LNAPL
Oil outletto pump
Hydrophobicoil inlet
Weightedsection
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� Connections
• Quick connect coupling allows connection with above ground suction pump or with in-well suction pump
Skimmer
Quickconnectcoupling
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Skimmer
� Above ground suction pump possible with liquid levels <3-4 m
• Pump should be explosion proof and LNAPL resistant
To diaphragmpump
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Suction-pressure pump
� 2” suction pressure pump; perfect for skimmers. Main features• Automatic incorporated regulator
• Pneumatic: Safe and explosion proof
• Does not need to be submerged
• Inert; can pump “all” solvents
• Can operate mounted on a skimmer
• Can also operate stand alone
• Factory tested automatic operation
• Factory pre-set can be customized
• Fitted with a non-return valve
• Limited flow
• For 2” wells
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Suction-pressure pump
� Suction-pressure pump stand alone operation�LNAPL or DNAPL above groundwater table
• Pump will produce an oil/water mix Remediation of LNAPL
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Suction-pressure pump
� Suction-pressure pump stand alone operation
• Pump should stay submerged in polluted water,
• Slow pumping needed if there is an LNAPL
Remediation of polluted
groundwater only
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Suction-pressure pump
� Suction-pressure pump with skimmer
• Pump will only collect oil; not water
• Only input: Air pressure
Remediationof LNAPL
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Suction-pressure pump
� Suction-pressure pump working principle: A pneumatic pressure powered piston pump.
• Suction is created by the spring
Remediationof LNAPL
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Large capacity pressure pump
� Main features
• Must be submerged
• Very high capacity < 55 l/min
• Float regulated; no piston
• Automatic incorporated pneumatic operation
• Inert materials, will pump all solvents
• For polluted groundwater and DNAPL
• Considerable air consumption
• For 4”wells, (3” type optional)
• Top filling or bottom filling types available
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Large capacity pressure pump
� Main pumping applications
• Landfill leachate
• Landfill gas condensate
• Hydrocarbon recovery
• Total fluids
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Large capacity pressure pump
� Working principle
Filling cycle:Water enters bycheck valve, pushes up floatthat switches air vent to air entrance
Empty cycle:Water enters bycheck valve, pushes up floatthat switches air vent to air entrance