32 Water/Wastewater
Main application for the new AMI Turbiwell
Raw water monitoring (surface water)
Most of the measurement points are at some distance in the countryside. Due to long travel times to the site, an instrument with as little maintenance as possible is required /called for.
AUTHOR DETAILS
Markus Bernasconi Sales & Support manager Swan Analytical Instruments Markus Bernasconi,
graduated from the University of Applied Sciences in Burgdorf, Switzerland in 2000 with a bachelor degree in chemistry and in 2002 with a post graduate course in integrated micro systems. He worked at the same location for about 4 years, leading research projects in the field of thin film deposition (PVD, CVD) and wet chemical wafer processing. He then changed to Mettler- Toledo Thornton, working as a project leader in the R&D. Subsequently, he joined Swan Analytical Instruments in 2006 working first as product manager and since the beginning of 2009 as a sales & support manager.
The sample contains harmful substances, pathogenic contaminants and particles of different sizes as mud or sand. Optical windows in direct contact with the sample would be covered with a biofilm or other sample-related precipitations which inevitably lead to turbidimeter performance failure and finally wrong measurement values.
Figure 4: Monitor AMI Turbiwell
The non-contact optics is the perfect solution to ensure measurement reliability and stability.
A programmable, automatic chamber drain clears the measurement chamber from settled particles.
ISO 7027 [2] vs. EPA 180.1 [3] ISO 7027 specifies a nephelometer uses a “red” light
source with an emitting wavelength of 860nm. There are no limitations regarding application and measurement value.
The EPA regulates the use of a nephelometer, depending on the turbidity value in the sample. Below 40 NTU, a tungsten lamp operated at a color temperature between 2200-3000°K and a detector with a spectral peak response between 400 nm and 600 nm have to be used; white light, because of the sensitivity to smaller particles (sensitivity ~ 1/λ4).
Above 40 NTU, red or white light is accepted. Water treatment process
Reliability of the instrument - especially that of the instrument’s light source and verified measurement values is the main feature in monitoring of the clarification / filter processes. Providing safe drinking water is the main objective and a deviation in turbidity will lead to different procedures.
But how to distinguish if this deviation is caused by a thin biofilm on the optical windows, a decreased lamp intensity or a real incident with the filters?
The answer is to exclude the possibility of deviation in the instrument itself.
Biofilm is not an issue for a non-contact set-up; lamp intensity monitoring and a dark current measurement provide the most accurate and verified measurement value possible.
Conclusion:
The new non-contact turbidimeter, the AMI Turbiwell with automatic or manual chamber drain and lamp intensity monitoring offers a variety of benefits in terms of reducing maintenance work and cost of ownership, and with the enhancement of reliability and stability. Therefore, not only the initial costs of a turbidimeter have to be considered. The economical factor of a low-maintenance but sophisticated instrument must also be taken into account.
[1] Standard
Methods.1995.Standard Methods for Examination of Water and Wastewater, 19th edition, America Public Health Association, AWWA, Water Environment Federation. Franson, M.H., A.D. Eaton, L.S. Clesceri and A:E: Greenberg (editors). Port City Press, Baltimore, MD
[2] International Organization for Standards (ISO). 1990. International Standard 7027 – Water Quality – Determination of Turbidity. ISO
[3] Environmental Protection Agency (EPA)
[4] Federal Register / Vol. 74, No. 216 / Rules and Regulations, ALTERNATIVE TESTING METHODS FOR CONTAMINANTS LISTED AT 40 CFR 143.4(b), Tuesday, November 10, 2009
[5] AMI Turbiwell, ‘‘Continuous Measurement of Turbidity Using a SWAN AMI Turbiwell Turbidimeter,’’ August 2009. Available at
http://www.nemi.gov
Every 20 Seconds a Child Dies because of Unsafe Water…
Aquaread (UK) has entered partnership with the registered charity Just a Drop, to help provide clean water and create a positive future for children and communities in some of the poorest parts of the developing world.
Aquaread, an award winning design and manufacturing company, brought together senior design engineers and managers from the aerospace industry with leading scientists from the pharmaceutical industry back in 2008, to develop and manufacture a range of highly advanced analytical test equipment primarily for field use. Their easy to use multiparameter probes, provide over 20 different water quality parameters within seconds.
Over the past 10 years Just a Drop has helped over 1 million children and their families in 29 Countries by providing them with a sustainable water supply. Their message is: ‘£10 provides a child with clean water for life’. For this reason Aquaread have pledged to donate £10 for every product sold. As an Aquaread customer, every product you buy saves a life.
To see the great work for yourself and to find out how you could help Just a Drop even more, visit them at
www.justadrop.org Registered charity No. 1100505
Reader Reply Card no 289
Online Measuring and Real-Time Control for Lower Environmental Impact
Selective, exact measurements from the Dulcotest sensors from ProMinent (Germany), combined with Dulcometer measuring and control equipment, provide reliable continuous monitoring and control.
The precise metering process complies with legally defined limit values, adding the required chemicals or disinfectants to the process at the right time and in the correct quantity. Chemical consumption is reduced to a minimum to minimise environmental impact.
Meet ProMinent at IFAT in Hall A3 Stand Reader Reply Card no 102 425/526. Reader Reply Card no 103
IET
Annual Buyers Guide 2010
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