30 Water / Wastewater
Looking for Lead and Copper in Drinking Water
Sterile, Robust and Precise pH Electrode
In the course of its continuous development of components tailored to the requirements of the market, Bürkert (Germany) has now expanded its range of sensors. An innovative, absolute measuring pH electrode is setting new standards in terms of robustness and sterile design. In contrast to conventional solutions, the electrode is not made of glass, but rather of an enameled steel tube that is extremely insensitive to mechanical stresses. Additional benefits: It is durable, maintenance-free and can be cleaned and sterilized without having to be removed.
The US EPA-approved SA-1000 Scanning Analyser from Palintest (UK) uses tiny, disposable electrode sensors to provide fast, accurate on-site testing for lead and copper concentrations in potable water.
Portable testing for these elements has traditionally suffered from a limiting lack of precision, but Palintest's simple technique – enabled by complex technology – provides results that are comparable to those obtained from lab-based atomic absorption methods. No complex sample preparation is required; a conditioning tablet is added to the water and then the electrode is inserted. The battery-powered SA-1000 then applies varying currents and potentials in order to determine the scale of lead and copper ion presence down to levels as low as 5 µg/l. The testing method is fully approved by the US EPA. Results are then saved in the unit's memory and can be easily uploaded on to a PC for reporting purposes. The testing process takes only three minutes and requires no special training or additional equipment, providing a cost-effective solution to potable water testing.
The requirements placed on pH measurement systems are increasing in food, beverage, pharmaceuticals and chemical applications as well as in water and effluent treatment. In particular, germ formation and migration caused by gaps, corners, dead spaces and dead volumes must be avoided completely. Another requirement: It should be possible to clean the devices in all applications without having to remove them – generally with steam or acidic/alkaline cleaning solutions. Furthermore, sensors and valves only have a chance in these types of application if they feature the following properties: sterile and robust design, high measuring accuracy over an unusually long period of time, high temperature and pressure resistance, and CIP (clean-in- place) compatibility.
Although conventional glass electrodes may meet all the hygiene requirements with ease, their major drawback is that they cannot be cleaned
in place. Which means that they have to be removed from the pipelines using a change fixture before they can be cleaned (they also have to be removed while the pipelines are being cleaned). They are then cleaned separately with chemicals in the change fixture and may also have to be calibrated. The risk during this procedure is that opening the process pipelines allows the ingress of germs and impurities into the process.
On the other hand, the innovative pH probe from Bürkert can be sterilized “in line”, meaning that it does not have to be taken out of the pipeline during a CIP cycle. Customers all over the world now appreciate the fact that these components eliminate their reliance on (automatic) change fixture.
Reader Reply Card no 109
Simultaneous, High Precision D180 and Dd Measurements from Water Samples
Reader Reply Card no 108
Taking on the Challenge of Phosphate in Wastewater
Picarro (USA)’s new L1102-i Isotopic Water Liquid analyser is an integrated, compact instrument that reports delta-180 and delta-D directly from water samples. In addition to requiring no special training or setup, the instrument is fully automated for running large sample batches, requires little or no sample preparation, provides data in minutes and does not need frequent calibration because it has minimal memory and drift. • Simultaneous measurement of d18O and dD • High precision (typically d18O < 0.1 ?, dD < 0.5 ?) –better than or equal to IRMS
• Minimal memory and drift • Large dynamic range with high linearity • Installed and operational in minutes
The heart of the Picarro L1102-i is the same WS-CRDS (wavelength-scanned cavity ring down spectroscopy) engine that is already field-proven in the company's CO2
and water vapor isotope analyzers.
The analyser is equipped with a thermally controlled optical cavity that ensures minimal drift. In addition, an onboard wavelength monitor enables the absorption lines unique to H216O, H218O, and HD16O to be scanned repeatedly and precisely.
The L1102-i is ideal for applications as diverse as climate change modeling, ice and water flow, aquifer dynamics, landfill leaks, bird migration mapping, and metabolic activity monitoring, to name just a few.
Reader Reply Card no 110 Measure Total Phosphate and Ortho Phosphate
The removal of Phosphate from the effluent of a sewage works is an essential part of the UK urban wastewater and related directives. Many more treatment works have Phosphorus discharge consents, but with the continuing high levels of Phosphate in untreated water staying within consent is a continuing problem. Partech Instruments has developed a closed loop
feed forward control inlet dosing system for the removal of Phosphate that is now being used by water companies throughout the UK. Based on the proven MicroMac C, this reliable and cost-effective approach can assist in achieving optimum dosing pump performance leading to considerable savings in chemical usage. The MicroMac C analyser incorporates a loop flow analysis (LFA) system a highly flexible technique that allows the analyser to cope with the high level of background Turbidity associated with raw sewage.
Reader Reply Card no 111 October/November 2008 AET
Used in municipal and industrial sewage treatment plants the legally prescribed limit values for total phosphate and ortho phosphate are reliable monitored by the PowerMon Kolorimeter with high precision. This Bran+Luebbe (Germany) PowerMon Kolorimeter offers 6 on-line measuring points for the cyclic, colorimetric measuring method. Beside the measurement of phosphate, cyanide and nitrate in waste water many other applications from our extensive method book are possible.
The easy and comfortable operation, the quick data transfer and the exact measuring results are only 3 of many advantages of the PowerMon Kolorimeter. For the measurement of various parameters, such as oxygen, pH, redox, conductivity etc., the connection of diverse sensors is possible. For these sensors the PowerMon Kolorimeter takes over the function of a measuring transducer. A concurrent processing of the separate measuring results among each other is possible as well.
Another important customer advantage is the full network capability of the
PowerMon Kolorimeter. The direct connection via all established interfaces, as for example LAN, ProfiBus, modem and USB, turns the PowerMon Kolorimeter to the leading network capable on-line monitor at the market. The remote diagnosis by connecting the PowerMon to the telephone system or a computer network.
Reader Reply Card no 112
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