A solution such as the LAR QuickOIL Analyser system, offers producers and WWTP's the ability to monitor any spillages on a continuous basis and the ability to react to any situation by having a pre-emptive warning system - running 24/7.

Rapid On-Line Oil in Water Monitoring.

Oils and fats are the main components in a variaty of products such as fuels and edible oils.  During production processes, these oils and fats can leak into the process and waste water systems.  This is not only costly to the producers, who effectively are losing product down the drain, but also add to the additional process costs to purify and treat the contaminated water.  


The Analyser determines hydrocarbons in water - which includes all fats and oils.  The Analyser system is effectively a Carbon Counter.

What is oil actually?

Oil is a collective term for viscous, sticky and fatty hydrocarbon substances. Oils and fats are extracted from raw materials, such as seeds and animals fats. Mineral oils are processed in oil refineries, where tons of steam and hot water are being used. Their purity is of big concern and requires fast and reliable analysis methods.

Oils are hydrophobic and thus it cannot be mixed with water. Oil can be present as free oil, as an oil sheen and / or as tiny droplets. But at an increased temperature, in turbulent conditions and when some process solvents are leaked into the water, oil can be dissolved or gets emulsified. As the water temperature slowly drops, the emulsified oil starts to separate, thickens, hardens and solidifies. Oil becomes fat. The typical solidification range depends on the type of oil, e.g. palm oil at 31to 41°C. As a consequence, a layer of fat is built up in process pipes and/or sewer systems, restricting the water flow.

It is extremely difficult to clean oily and fatty wastewater. Whilst free oil rises to the water surface where it can easily be skimmed, the emulsified and dissolved oil flows untreated through the oil and fat separator.  This can have dire effects on any WWTP.  

  • Exact determination of Oil-in-Water (OIW)
  • Measurement Range: 0.1-50,000 mg/l, further options available
  • Proven thermal oxidation principle
  • High combustion temperature (1,200°C)
  • Catalyst-free
  • Response Time: 2-3 minutes
  • Up to 6 sample streams can be monitored on one Analyser system
  • No sample filtration required
  • High salt concentrations possible, up to 30% NaCl
  • No memory effects
  • Maintenance and operational costs are low with no hidden costs




  • Oil in water
  • Waste water
  • Process water
  • FlowSampler
  • Multi-stream measurement
  • Combination with TOC, COD and TNb detection
  • IP54 (Standard)
  • NEMA 4X
  • ATEX Zone I
  • ATEX Zone II

Common OIW methods and their limits.

Most online oil-in-water analysis methods are based on an indirect measurement and are only suitable for a certain type of oil (fluorescence) respective oil droplets (scattered light principle) or dissolved oils (spectroscopy).

It becomes really challenging when the oil-in-water composition varies frequently over time and when it contains a mix of different unknown types of oils. As a result, these water cannot be determined by common indirect measurements.

Moreover, due to the multitude of wetted parts used, many OIW methods are not suitable for online measurements. These parts require huge cleaning and maintenance efforts.

LAR‘s solution: QuickOIL.

For the determination of higher concentrations, many online analysers have to dillute the sample with demineralized water. Due to the hydrophobic characteristics of oil, dillution techniques are not applicable.

Furthermore, oils and fats cause absorption and adsoprtion on wetted parts leading to carry-over and memory effects. This increases the response time resulting in a slower recovery after a peak contamination.

LAR’s QuickOIL does not need any dilution or pretreatment of the sample. There are only three wetted parts in the anaylser that are in contact with the sample - and these parts are being flushed with clean water after every measurement. The entire oxidation power of the QuickOIL ranges up to 50,000 mg/l. Thus, LAR‘s ultra high temperature combustion at 1,200°C is way ahead of common thermal oxidation methods.

Industry Applications:

  • Food Industry
  • Waste Water Treatment processes
  • Refinery applications

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