Measurement of Fats, Oils and Grease (FOG) in waste water is a crucial parameter in water quality control and environmental monitoring performed by water suppliers’ laboratories and environmental authorities; the contamination builds up in the sewerage system and will eventually lead to blockages. Typically the waste water is analysed by first passing a large volume through a filter then selectively determining the grease build-up on the dried filter by an analytical method.
By Oxford Instruments plc based in Abingdon, UNITED KINGDOM.
It is estimated that 23-28% of Sanitary Sewer Overflows (SSOs) are due to Fats, Oil and Grease (FOG). With significant growth in the commercial food sector on top of other high FOG producing industries such as metal processors, meat packers, cosmetic manufacturers and industrial laundry establishments, the need for publicly owned treatment plants (POTWs) and industries to regulate and monitor FOG is crucial to public health. Besides clogged sewer lines, high FOG levels also disrupt the effective operation of a wastewater treatment plant. An important feature of any FOG program is locating and monitoring high oil and grease producing industries and food service establishments. InfraCal TOG/TPH Analyzers provide a simplified procedure for FOG analysis based on solvent extraction and infrared absorption which can give the regulator or operator an on-site result in less than 10 minutes.
Thermal mass flow meters provide excellent measurement capabilities in dry gas flows. They have proven durability, accuracy, and repeatability. However, thermal flow meters are sensitive to liquid droplets in a wet gas stream. For a thermal flow meter to work accurately in a condensing gas environment, the probe must be placed far enough downstream so that the entrained water has condensed onto the pipe wall. In a very wet environment, any condensing liquid (commonly referred to as mist or fog) contacting the sensor probes causes a high reading due to the liquid vaporizing on the heated portion of the sensor. As a result of this deficiency, measurements with conventional thermal meters are largely ignored when moisture levels rise because there is no confidence that the measurements are true.
By Kurz Instruments, Inc. based in Monterey, CALIFORNIA (USA).
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