Water / Wastewater 15
Covid wastewater surveillance test kit expanded
IDEXX has expanded the SARS- CoV-2 wastewater surveillance test kit range by incorporating a matrix and faecal control kit, which provides a validated matrix recovery control and human faecal measurement for normalisation in a single, multiplexed reaction.
The EU Commission recommends both of these controls for providing actionable SARS-CoV-2
wastewater surveillance data to public health offi cials.
IDEXX has worked with laboratories around the globe to accelerate the implementation of wastewater surveillance. The SARS-CoV-2 RT-PCR Test offers standardised methodology, consistent results, and is supported by comprehensive IDEXX quality-control procedures and supply chain expertise.
In 2021, a Water Research Foundation (WRF) study showed the IDEXX test outperformed most methods on consistency of detection.
IDEXX introduced the Water SARS-CoV-2 RT-PCR Test in July 2020 to support wastewater surveillance to track the prevalence of COVID-19 in communities. The Water SARS-CoV-2 RT-PCR Test combines the company’s long history of developing PCR tests and over 20 years providing validated wastewater tests. The test gives consistent results that have been validated on real-world and geographically diverse samples.
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New compact 12V submersible pump for groundwater sampling
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Advanced water quality monitor installed in the Serpentine
Looking to fi nd ways to keep improving water quality, the managers of the Royal Parks in London have installed a continuous water quality monitor; an ESNET (Environmental Sensor NETwork) system from the company Meteor Communications.
The Serpentine, located in Hyde Park, is monitored by the Environment Agency which collects samples for bacteriological analysis every week between May and September. However, the ESNET continuous water quality monitor was installed to improve understanding of the factors affecting water quality.
Covering an area of around 16 hectares, the Serpentine was created in 1730 by the wife of George 2nd, Queen Caroline. Originally fed by the River Westbourne and Tyburn Brook in the 1730s, the lake’s water was later pumped from the River Thames. Today, water is pumped from two boreholes from within Hyde Park.
The water quality monitoring system was installed in February 2022, measuring key parameters including blue/ green algae, chlorophyll, temperature, conductivity, pH, Turbidity and dissolved oxygen. Measurements are taken continuously in real-time with updates every 30 minutes to the MeteorCloud™ web portal, with instant alerts for any issues that may infl uence bathing water quality. “The ESNET system will provide essential data for the future management of the lake,” explains the Royal Parks’ Dr Pawel Szynkarczuk. “We need this empirical data to better understand short- and long-term trends, as well as the factors affecting water quality. For example, a key advantage of a continuous time-series dataset is the ability to correlate water quality incidents with potential impact factors such as ambient temperature and heavy rainfall.
“The Environment Agency’s laboratory tests are more focused on bathing safety, whereas the wider variety of parameters monitored by ESNET will provide greater insights into the factors affecting water quality generally. The ESNET system will therefore allow us to make informed decisions, whilst also enabling us to measure the impact of any improvement measures.”
Water quality improvement measures currently include litter/debris removal as well as aeration at 24 points around the lake. However, the large population of wildfowl in Hyde Park is the likely cause of any water pollution; with raised nutrient levels during summer being an area that is carefully monitored. The water quality challenges presented by the wildfowl are compounded by Park visitors feeding the ducks and geese by throwing food into the water. Raised nutrient levels during summer are therefore carefully monitored, and an initiative is underway to try to alter visitor behaviour. “We have a campaign entitled ‘Help Nature Thrive’, which is designed to discourage overfeeding – it’s not good for the birds and it certainly isn’t good for water quality,” explains Assistant Hyde Park Manager, Ian Nightingale. “In the past, we have had to address raised nutrient levels on two occasions by dosing the water with a modifi ed bentonite clay which binds with free reactive phosphorus. While this method appears to be effective, it is expensive, so the provision of continuous monitoring will enable us to fully evaluate the cost/benefi ts of any future water quality improvement measures.”
The ESNET system has been installed at the Environment Agency’s water sampling point, adjacent to the lake’s bathing area, and the water quality sensors are built into a compact water quality sonde which is permanently located beneath the water surface. In order to maintain the highest levels of accuracy, the sonde is routinely swapped out with a pre-calibrated sonde by Meteor Communications.
The entire system runs on very low levels of power, with a small solar panel meeting the power requirement of the entire ESNET system. “This is very important,” explains Meteor MD Matt Dibbs. “These systems are usually installed in remote locations for customers such as the Environment Agency and utility companies; frequently these sites have no pre-existing power or communications capability.
“We were recently consulted by the Environment Audit Committee and provided them with a live demonstration; explaining how ESNET systems are monitoring UK rivers and providing alerts when potential pollution incidents could threaten bathing water quality. We hope that the Serpentine ESNET system will deliver similar benefi ts; helping the park managers to improve the lake’s water quality.”
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Solinst Canada Ltd. has introduced a new addition to their groundwater samplers product line – the Model 415 12V Submersible Pump provides an effi cient means of purging and obtaining groundwater samples from 2” OD monitoring wells.
The 12V submersible pump and 12V pump controller are lightweight, portable, and easy to set up, deploy and operate. The pump’s sleek, short design (nominal 6”) ensures it fi ts easily down wells that might not be straight.
The 12V submersible pump cable connects to the 12V pump controller, which then clips to a 12V power source, such as a 60 amp AGM battery or higher, or a car, truck or marine battery. Simply turn the dial on the 12V pump controller to increase the voltage to the controller, which turns the pump’s motor faster and increases the fl ow rate.
The Solinst 12V Submersible Pump is capable of pumping groundwater from 36.5 m (120 ft.) below ground surface, with fl ow rates up to 13.5 L/min (3.6 US gpm) in shallow conditions. The continuous fl ow rate is very easy to adjust using the 12V pump controller’s single dial.
Save time and reduce sampling costs by connecting a new Model 800M Mini Packer to the 12V submersible pump intake. This will isolate your sampling zone and minimise purge volumes.
The Solinst 12V Submersible Pump is ideal when sampling using three volume purge protocols or performing constant head tests in high K (hydraulic conductivity environments). For use in environments with high suspended solids, an optional in-line disposable fi lter threads onto the pump’s intake.
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Chlorine (Cl2) has always been a diffi cult gas to handle when using traditional gas cylinders. It is very reactive and problematic in terms of accuracy and its erratic shelf life. This has made life diffi cult for personnel working across a wide range of industries, such as in the water treatment sector.
With this in mind, Euro-Gas designed and developed their GazCal Gas Generator, which is now an indispensable tool for people working with chlorine gas. Engineers within the water industry fi nd this rugged, portable and battery-operated tool ideal for testing and calibration, both in the lab and in the plant. The GazCal comes in a robust and compact carrying case and enables rapid testing and calibration with negligible warm-up time. This simple to use device can be operated by anyone! Simply set the necessary PPM level via the unit’s dial-up digital display and it is ready for action. The Gazcal generates Cl2 levels ranging from 0.5 – 20 ppm and is also suited to act as a surrogate for the cross-calibration of O3, ClO2, COCl2, HF and F2.
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Euro-Gas have designed the GazCal to overcome the usual problems of a low shelf life. Cell life is only used up when the unit is in operation, whilst traditional cylinders can simply die out after up to 6 months. The generator can therefore last for up to a decade, often without the necessity to change the cell and needing only a yearly recertifi cation of calibration, which can be carried out by Euro-Gas or qualifi ed technicians at the site.
The GazCal cell has a lifetime of 500ppm hours, equating to 100 hours of constant use at a 5ppm concentration level, which enables a minimum of 400 individual calibrations. Operators can see the life span of the generating cell on the unit’s cell life indicator. Once the cell is used up, a new generating cell can be installed easily. Depending on the level of experience that the engineer has with gas detection calibration, regular small gas cylinders will usually only perform around 5 – 10 calibrations per cylinder. The GazCal may initially be more costly than a small cylinder but in the longer term, the generator will be far more economical.
Moreover, gas cylinders only attain one specifi c concentration per cylinder purchased, say for instance 5ppm of Cl2, whereas the GazCal is totally adjustable between the 0.5ppm to 20.0ppm range and in 0.1ppm steps. Therefore, the Gazcal produces many different concentration levels from one device. In addition, low concentrations of Cl2 are effi ciently produced with the GazCal, even 1ppm and 2ppm levels, whereas it is extremely problematic to achieve cylinder stability at low concentration levels.
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A simple and eff ective solution to chlorine generation
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