28 Water / Wastewater


Cooling tower ozone disinfection systems rely on reagent-less analyser for monitoring O3


Plant engineers who’ve switched or who are thinking about the switch to Ozone (O3) disinfection of water for high- temperature evaporative cooling towers will find the reagent-less OZ80 Ozone Analyser from Electro-Chemical Devices provides a green-friendly design that helps them optimize treatment while at the same time reducing cost, simplifying maintenance and avoiding complex environmental issues.


ECD’s advanced OZ80 Analyser helps ensure effective ozone treatment of cooling tower water to prevent bacterial growth, scaling and corrosion. Ozone as a disinfectant replaces the need for chlorine and other harsh biocides and inhibitor chemicals that are considered toxic hazards, require special wastewater treatment and effluent monitoring.


In comparison to reagent-type analysers that come with multiple components which first must be installed and then require field calibration, the OZ80 Analyser is factory assembled and factory calibrated prior to arrival. All the technician needs to do is mount the panel and connect the drain lines, plug in the power cord and select the outputs on the display as 0 to 2.0 ppm for water disinfection or 0-20.00 pm for oxidation and bleaching operations.


Dual range measurement of both Ozone (O3) parameters also is available with the OZ80 Analyser. O3 is a colourless to pale blue gas that in low concentrations gives off an irritating acidic odour. It is a strong oxidiser, stronger than either chlorine (Cl) or chlorine dioxide (ClO2). O3 reacts quickly and disintegrates into oxygen gas without the formation of harmful disinfection byproducts (DPB’s) common to chlorine disinfectants that require additional costly treatment. It also increases the amount of oxygen in the water.


O3 is gaining ground as a disinfectant and bleaching agent in multiple industrial processes. It has been used for years in municipal drinking water and wastewater treatment plants. It is useful at several points in the drinking water treatment process as an oxidiser for removing metals from well water as well as organics, odours and colour from surface water too.


ECD’s OZ80 Analyser features powerful amperometric sensors to detect and monitor O3 levels. These amperometric sensors are manufactured with a gold cathode, a silver anode and a rugged microporous membrane. Unlike many other instruments, there are no reagents required with the OZ80 Analyser. Its O3 sensor technology and pH measurement are reagent-less designs. These sensors keep the cost of ownership low by not requiring expensive reagents.


The O3 sensors are smart sensors with their identity and calibration information stored internally. Communication between the OZ80 Analyser’s T80 Transmitter and the O3 sensor is via MODBUS. The sensors are flow sensitive requiring a minimum flow rate of 0.5 ft/sec, above this flow rate, the reading is virtually independent of the flow rate.


The OZ80 Analyser’s constant head flow control device (CFD) maintains the optimum flow rate moving past the sensor for sampling purposes. The CFD’s automatic flow control capability eliminates the need for pressure regulators and rotameters, which are required by many other H2O2 analysers, to reduce system maintenance and lifecycle operating costs. The minimum flow rate required by the CFD is 10 gal/ hr, and the maximum flow rate is 80 gal/hr with the sample draining at atmospheric pressure.


The OZ80 Analyser is available with an optional sensor auto clean configuration. The sensor auto clean features a solenoid actuated spray cleaner that provides either a 30 psi process water or air. The spray cleaner removes films from the sensor head, which over time can affect measurement accuracy. There is rarely a need for manual wiping of the sensor head by maintenance technicians with the spray clean configuration.


Designed with ECD’s T80 Universal Transmitter, the OZ80 Analyser includes a 128-x-64 pixel (2.75-x-1.5-inch) display. The display is black on grey with no backlight or blue on a white background with the LED backlight. The standard configuration features two 4-20 mA outputs, three alarm relays and MODBUS RTU. The enclosure is rated to IP65 and weatherproof.


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Announcing the launch of our new


handheld water quality meters HORIBA Instruments is excited to announce the launch of the LAQUA 300 series handheld meters. Three variants of the handheld instrument are available: single-channel, dual channel and triple channel. Customers are free to attach any of the respective sensors on any of the connectors, swap for a different sensor, and with a special adaptor, existing electrodes can also be used.


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Thus the WQ 330 triple-channel meter offers an amazing 35 meter-sensor combinations!


The LAQUA 300 meter adopts the parameter of the sensor that is connected, auto- recognizing the sensor. Key to this feature is the sensor head at the end of a 2m or 5m cable and to which the sensor cartridge is attached. For the pH and EC, the sensors are available as a replaceable cartridge. Whereas in the DO probe, the sensor head is integrated with the cap being replaceable.


New to the line-up are the 4-cell Conductivity cell and Optical Dissolved Oxygen probe, both with integrated temperature sensors.


The LAQUA 300 series meters are able to store up to 10,000 data sets with date/ time stamping. The data in the memory can be transferred to your PC wirelessly with the Flash Air card equipped with every LAQUA 300 meter. Alternatively, the meter can be connected via a standard micro-USB cable and the PC recognizes the meter as an external storage device.


More information online: ilmt.co/PL/0RYJ


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International Triathlon Union agree partnership for fast and reliable water quality tests


Tecta-PDS is pleased to announce that it has partnered with the International Triathlon Union (ITU) for delivering fast and reliable microbiological water quality tests in ITU sanctioned events. The Tecta portable laboratory, already implemented in the 2019 ITU World Triathlon Olympic Qualification Event in Tokyo, allows the ITU staff to obtain results of E-Coli and Enterococci bacteria in the body of water tested in less than 12 hours.


“For ITU, the health and safety of our athletes is our first priority, but also is a priority our commitment with the clean environments, sustainability and legacy wherever we go, and with this partnership we show once again that we are not only talking, we are taking actions”, said ITU President and IOC member, Marisol Casado. “Partnering with someone that will help us swim in cleaner environments, work with LOCs to improve the water quality everywhere we go and leave that legacy to the host cities is something of paramount importance not only for our organization, but also should be a priority for all, to do our contribution to make the world a better and cleaner place”, she said.


“For us, partnering with TECTA means that we are able to have results of the water quality tests in such a short period of time allows the Technical team on site to take decisions in the last minute, always according to the quality of the body of water”, said ITU Sports Director, Gergely Markus.


Working with the portable Tecta Lab in the Tokyo Test Event proved to be decisive for us, giving ITU the ability to take decisions by having the latest data available. The portable lab is really easy and simple to use, and gave the ability to know if the water quality levels were above our threshold within 12 hours. The results were completely reliable, and matched the ones we received from the laboratory used by the LOC, which came 48 hours later.


During the four days of the Test Event, as well as the week before, the ITU Team in Tokyo performed two daily tests of the water at Odaiba Bay. Both the tests performed on the Tecta Laboratory and in the LOC Laboratory showed low levels of E-Coli and Enterococci in the days leading up to the event.


But the Tecta results confirmed the breach of the protective curtain on August 16th/17th, providing valuable data for ITU to take the decision of cancelling the swim leg of the Paratriathlon event, as well as the swim familiarization for the Mixed Relay, according to the water quality tests.


The rapid E-Coli results from the portable laboratory proved to be crucial to maintain the health and safety of all athletes, preventing potential illness. The results from the LOC laboratory, which came back 48 hours later, confirmed the ones provided by Tecta.


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