Water/Wastewater Nutrient Monitors Shine in Final Effluent Trial


The levels of nutrients, such as ammonium and phosphates, entering natural water resources is of great concern because these nutrients can either remove vital oxygen or lead to excessive plant growth and algal blooms, which harm wildlife through eutrophication. In addition, high levels of phosphate or nitrate in abstracted water significantly add to the cost of drinking water treatment. The management of nutrient levels is therefore dependent on the ability to monitor accurately and reliably, and as a result, a group of UK water companies organised a joint monitoring trial to determine the best instruments.


The trial involved the installation of turbidity, phosphate and ammonium monitors from the market’s leading manufacturers at two designated final effluent plants within the UK. HACH LANGE (UK) provided an AMTAX sc ammonium analyser, a PHOSPHAX sc phosphate analyser and a SOLITAX sc turbidity analyser for the trial.


The SOLITAX sc performed better than any of its competitors and as a result, Severn Trent Water has adopted the instrument in a framework agreement.


Summarising the report on the AMTAX sc and PHOSPHAX sc, John Moroney says “We are delighted to report that these analysers came first in almost all of the key performance measures, which included correlation to diurnal data, variance to laboratory data, and maintenance requirements. However, the panel decided to take the List Price as opposed to current framework prices for the commercial part of the assessment. However, the overall results are extremely encouraging and I know that our customers are very impressed with the technical performance of these units coupled with such low levels of maintenance. The manufacturers did not have access to their equipment during the trial, but over the 4 month period, the AMTAX required 2 hours of maintenance and the PHOSPHAX just one hour!”


The whole life costs of the Amtax sc for Ammonium and Phosphax sc for orthophosphate have been drastically reduced as a result of the chemistries employed. With the Amtax sc, a gas sensing electrode is utilised which means that reagent consumption is halved in comparison with traditional colorimetric analysers. For the Phosphax sc, the stability of the vanado-molybdate method, means that calibration is not necessary and therefore no calibration standards are required.


The results of this trial will be of great interest to process managers who have to comply with tighter discharge consents as a result of the Water Framework Directive. Couple this with the fact that HACH LANGE can now offer sample preparation systems that deliver continuous samples from the inlet all the way through to final effluent, John Moroney firmly believes these analysers lead the way in reliability, accuracy, stability and the lowest whole-life costs.


Reader Reply Card No.


Online Turbidity Measurement in Potable Water – Non-Contact and Low Maintenance


The measurement of turbidity is based on the Nephelometric method and is enforced according to the “Standard Methods of Examination of Water and Wastewater” / ISO 7027.


As in all optical monitoring procedures, fouling of the optical windows has a considerable influence on accuracy and maintenance.


The monitor AMI Turbiwell fromSwan Analytical (Switzerland) is a non-contact turbidimeter with a minimal operating service.


The measuring cell is designed so that the section above contains the heated optical system, and the section below, the non-pressurised measuring chamber, is fitted with a manual or automatic blowdown valve. Because of this, it is possible to easily remove particles of dirt without any disturbance in the process. Air bubbles in the sample water are removed automatically by an overflow system. The optimum sample flow of the measuring instrument is 20 L/h.


The choice of light source is decisive. Instead of a conventional lamp with a limited life expectancy, the AMI Turbiwell has an LED with a life expectancy of approx. 100’000 operating hours and therefore maintains its stability. This makes frequent lamp replacement with complicated calibrations unnecessary.


In order to fulfil the QA standards or national regulations, a quick and simple verification can be carried out with the AMI Turbiwell using secondary standards. For the accuracy and validation of the measurement in operation, the sample current is monitored online with a flow meter control.


Due to its measurement principle, the AMI Turbiwell can be applied to all types of water: for spring water, ground water, tap water and also waste water.


Reader Reply Card No. Reader Reply Card No. 223 www.envirotech-online.com IET September / October 2012 225 222


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Myron L Company Offers Innovative New Water Quality Instrumentation


from a Company You Can Trust We are proud to offer innovative new technologies that add greater levels of performance and convenience to our existing line of water quality instrumentation:


ULTRAPEN™ PT2 pH & Temperature Pen features one-button operation with dip or scoop sampling for measurements in standing bodies of water and vertical streams. Advanced features include the ability to choose between snapshot and continuous measurement modes; 1, 2 and 3 point calibration for superior accuracy; automatic temperature compensation; fully encapsulated electronics; proprietary sensor construction; highly stable microprocessor-based circuitry; and waterproof housing.


ULTRAPEN™ PT1 is Myron L’s groundbreaking new Conductivity/TDS/Salinity tester. The PT1 pen features the accuracy and stability of benchtop lab equipment with the convenience of a pen. Unlike any other instrument in its class, the PT1 allows the user to select from 3 of the most commonly used solution standards: KCl, NaCl, and Myron L’s 442 proprietary standard for Natural Water™.


The 6PFCE is the next generation in Myron L’s advanced microprocessor-based Ultrameter II line. Featuring the same


stability and accuracy of the 6P in conductivity, resistivity, TDS, pH, ORP and temperature measurements, the 6PFCE adds a powerful new enhanced free chlorine equivalent function developed through extensive bench testing at the Myron L Company. FCE


™ displays both the accelerated ORP reading (in mVDC) as well as an equivalent free chlorine


concentration (in familiar ppm). Measurements are fast, accurate and accomplished with the press of a single button. No additional chemicals or reagents are required.


Ultrameter III 9P Titration Kit is Myron L’s innovative new solution to comprehensive water quality testing in the field. The 9P features fast, one-touch measurements for conductivity, resistivity, TDS, ORP, free chlorine, pH and temperature, but adds the unique ability to perform in-cell conductometric titrations for alkalinity, hardness and LSI.


Reader Reply Card No. 224


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