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Mongstad Refinery - Case study Highlights

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Norwegian Technology AS has been participating in a project at Mongstad together with Norsk Gjenvinning AS

The customer - Equinor Mongstad Refinery - introduced new exacting regulations. Oil from the sludge can no longer be sent away for disposal (it is ”red listed” by the Directorate for Nature Management) meaning that the oil has to be used at the refinery. The oil cannot contain more than 1% water and particles - to prevent steam explosions. Without Mud Split it was not possible for Norsk Gjenvinning AS using heater, decanter and disc stack sentrifuge to attain less than 40% at best case.

New Equinor Mongstad Refinery requirements in 2020: less than 1% water and solids in the oil to become products at the refinery.

By adding Mud Split before the heater they managed less than 0.3% water in the oil.

Results without MUD SPLIT: 40% water and solids in the oil.


Technology set-up: mixers for homogenisation in storage tanks, mixing-tank with heater dosing of chemical, decanter (for separation of solids), Disc stack centrifuge (separation of oil from water)


Volume treated in one batch: 17 000 bbl
Dosing of Mud Split: 0,08 litre/bbl

After dosing and centrifuge the sludge separated into:
•  Dry solids separated:                   1 700 bbl
•  Crude oil to the refinery:                       5 100 bbl
•  Water to the treatment facility:           10 200 bbl

Value of the oil: 280 000 USD (oil price December 2020)

Estimated cost of delivery of the 17 000 bbl as hazardous waste in Norway:  95 USD/bbl  totalt 1 600 000 USD


Recovered water treatment for discharge

Most refineries have water treatment equipment implemented as part of their daily operations.  In the event of limited treatment capacity or at remote locations,   Norwegian Technology can provide mobile separation equipment for separation of suspended particles, heavy metals and residues of oil.

Lab tests

Norwegian Technology conducts a lab test with representative samples in order to accurately identify the most appropriate mud split chemicals, to optimize their dosing, to evaluate the reaction time relative to temperature and, last but not the least, to draw a technical proposal highlighting the consequent cost savings for the Customer. 


Each Mud Split product comes with its own Safety Data Sheet (SDS) important component of the product stewardship, occupational safety and health, and spill-handling procedures. The SDS information include instructions for the safe use and potential hazards associated with the product. The SDS includes instructions related to storage requirements, protective gear, and physical, chemical and environmental data.
Norwegian Technology AS “Oily Sludge Split” chemicals can be used both offshore and onshore.

The different dosing procedures are determined by the characteristics of the sludge, the chemicals dosing usually varies between 0.5 and 2 litres per m3 of sludge.


Norwegian Technology “Oily Sludge Split” chemicals can be shipped all over the world on Customer request.


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