Water Utilities use WRc's "Loadmon" to help provide low maintenance measurement of wastewater organic load.

Monday, November 01, 2010 1:54:00 PM

Timing is everything - This is the lesson of WRc’s latest development project "Loadmon". It began as an EC concept in 1998-2002 and nearly made it to a commercial product in 2005 as a final effluent monitor. But the "Loadmon" concept, the non-contact sensing of wastewater organic load, is now more cost-effective to be developed because of the increasing price of energy and the need to save carbon in the water and waste industry.

In the waste industry, the advanced control systems for the activated sludge process need to measure the organic load of crude and settled sewage for feed forward control. Loadmon’s non-contact method is ideal for process control in providing a reliable and low maintenance measurement of this load.

The working principle is shown in the schematic diagram. The sensor uses light at different wavelengths to interrogate a flowing sample in an open channel. From the scattered light received, the suspended solids and UV absorbance can be deduced and from this, the particulate and dissolved organic load. The method is immune to fouling. The proposed project will develop the method in the laboratory, then build and site test a pre-production prototype with a manufacturing partner. This development is supported by United Utilities, Severn Trent Water, Northumbrian Water and Northern Ireland Water. Further similar products could be developed in the future for sewer network and combined sewer overlow (CSO) use.

For further information contact Leo Carwell at leo.carswell@wrcplc.co.uk or telephone +44 (0) 1793 865131.