Online TOC Analysis of Vegetable Oils and Animal Fats in Waste Water

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DÜPERTHAL Sicherheitstechnik GmbH & Co. KG

Shimadzu Deutschland GmbH

Elementar Analysensysteme GmbH

LAR Process Analysers AG

Problem: Facing the Memory Effect

Most analysers have problems with a phenomena called memory. Basically, this memory effect is caused by the absorption and adsorption of the organic compounds from the sample by the wetted parts of the analyser. These memory effects result in a reduced response time, a slow recovery after measuring a high peak and cross contamination for multi-stream applications. Techniques to lessen these memory effects are to reduce the surface area of wetted parts, a rinsing technique to clean wetted surfaces and an outstanding oxidation technique, e.g. thermal oxidation.

How to Overcome Problems With Waste Water Analysis

The QuickTOC manufactured by LAR Process Analysers does not have problems with the issues mentioned above. It proves to be most suitable for oil, fat and grease applications and in numerous oil-in-water applications it is successfully in operation. There is no sample pretreatment or dilution technique needed; samples are directly injected into the reactor and only three components come into contact with the sample: the sample tube, a quarts glass overflow vessel and a rugged injection needle. It offers a full oxidation up to 50,000 mg C/litre, irrespective of what type of oil is injected and regardless of the organic content of the sample.

For A Fat Free Water Treatment

The applied 1200 ºC thermal oxidation technique is superior to any other oxidation technique. The special design eliminates the need for components that are often subject to maintenance, e.g. pinch valves, rotating multi-port valves, pumps and more. Furthermore, LAR is able to deliver a 2-stream oil-in-water analyser system in order to monitor the influent and effluent waste water loads simultaneously and thus determine the efficiency of the WWTPs operation.

* The author is Specialist Environmental Projects, ODS Sampling and Analytical Systems, Ridderkerk, the Netherlands.

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