Water / Wastewater 45


The fastest and most eff ective way to fi ght bacteria and material


damage Microbes have favourable conditions in which they thrive. Unfortunately, these conditions are ideal in industrial processes where water is involved in any form. This is particularly the case in evaporative cooling water systems where microbes are abundant due to the concentration of nutrients through the system ‘cycling’, but also in further industrial water applications. The easiest and quickest way to get certainty about unwanted microbiological inhabitants is Lovibond’s dipslides. They indicate the presence of microbes with semi- quantitative methods and thus enable prevention right in time.


But why are bacteria and microbiological infestations so dangerous for industrial systems? Due to the constantly wet surfaces, the abundant growth of microbes leads to the formation of biofi lm. These biofi lms, if left untreated can result in biofouling, resulting in reduced plant effi cacy and potentially reducing plant life. The microorganisms are generally common soil, aquatic, and airborne microbes that enter the system either via make-up water, process leaks, or are scrubbed from the air and they vary depending on the source of water. That can be bacteria in a large variety. Spherical, rod-shaped, spiral, and fi lamentous forms are some of the more common species. Other sorts of microorganisms are fungi, often moulds and yeasts. They can also produce slime. Blue–green algae are now classifi ed with bacteria - Cyanobacteria. Green growths however are still responsible for blockage of screens and distribution decks.


All of them need to be controlled, but their control depends on whether they are in a planktonic (free-fl oating) or sessile (attached) form. The sessile form is responsible for biofi lm formation. The microorganisms that form them secrete polysaccharides when submerged allowing them to form a gel-like network which prevents them from being removed by the normal fl ow of water and hinders the action of a biocide, either oxidising or non-oxidising type. This is the reason the control of biofi lms can require biocidal dosages many times higher than the control of planktonic species.


Once fouling has occurred in a system even mechanical cleaning cannot remove all traces of the biofi lm. Surfaces that have previously been fouled are more susceptible to colonisation than new surfaces as residual biofi lm materials promote growth and reduce lag time between fouling and reappearing. Biofi lms also cause the insulation effect where the performance of the heat exchanger deteriorates in correlation to the thickness of the biofi lm. They also cause corrosion known as Microbial Infl uenced Corrosion (MIC): whereby, the microbes act as catalysts; microbes also prevent corrosion inhibitors from reaching and passivating the metal surfaces and corrosion reactions are accelerated by microbiological interactions. In addition: Microbial by products can be directly damaging to the metal. It has therefore been “Best Practice” to use indicator organisms to gain a general overview of the overall microbiological condition of the water. Traditional methods have adopted standard agar plate count methods. They require to fulfi l regulatory guidance, however, as the plate count method requires a laboratory, fi ltration set up, and training in how to count the results. The simpler method for monitoring is agar dipslides. They form part of many legislative guidance papers in terms of routing microbiological monitoring. They are relatively inexpensive, easy to use, and are available in multiple formats to optimise growth conditions and types of microbe. Lovibond®


offers a


wide range of dipslides for every situation, with large surfaces of 11.5 cm2


for high sensitivity and an


effective contact area of 10 cm² for easy calculation during surface testing; the media is produced in accordance with ISO 11133 and the dipslides are capable of monitoring microbial growth with a potential of more than 100 (102) organisms in one millilitre of sample liquid.


More information online: ilmt.co/PL/8NwN 61447pr@reply-direct.com


For More Info, email: email:


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Deep water discrete interval sampler reaches depths of 1200 meters


The 425-D Deep Sampling Discrete Interval Sampler, from Solinst, obtains representative water samples from a specifi c zone without the need for purging. It can sample from submerged depths as much as 1200 m (4000 ft). The stainless-steel sampler is connected to LDPE tubing, mounted on a convenient reel. Operation follows the basic principles of hydraulics. The sealed sampler is pressurized at depth allowing water to enter. The sampler is vented and sealed before retrieval to surface, maintaining sample integrity. Ideal for obtaining water samples from below fl oating product layers (LNAPL) or sampling the product itself. For shallow applications, Solinst offers standard Model 425 Discrete Interval Samplers.


More information online: ilmt.co/PL/38qj For More Info, email:


email:


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A Cost-Eff ective Solution for Water Treatment Requirements Myron L®


Company’s 900 Series™ multi-parameter water quality monitor/


controller is easy to install, easy to use, and does the job of seven separate instruments single-handedly.


Precisely monitor and control an array of critical water and wastewater parameters with the legendary accuracy and reliability the Myron L Company has come to be known for. The 900 Series Monitor/Controller features a simple-to-use LCD touchscreen Graphical User Interface along with pluggable terminal blocks for quick and easy equipment installation and confi guration.


Get a comprehensive real-time picture of solution status with continuous readings from up to seven different inputs: 2 Conductivity/Resistivity/TDS/ Salinity; 1 pre-amplifi ed pH/ORP; 1 BNC pH/ORP; 1 fl exible 0-20/4-20 mA; 1 RTD Temperature; and 1 Flow/Pulse. % Rejection is also available as a derived value. For maximum accuracy, Conductivity/TDS measurements feature the ability to select from one of three preprogrammed solution modes, KCl, NaCl, or Myron L’s own 442 Natural Water™ Standard, or to program a “User” solution mode based on a known solution. Temperature compensation is automatic to 25°C but can be disabled by the user as required. The pH/ORP input channel works with Myron L pre-amplifi ed pH and ORP sensors which contain precision circuitry that increases accuracy and permits application of the sensors over greater distances. The 0-20/4-20 mA input allows user-defi ned 0 to full scale values and units of measure for a wide variety of sensor types. Electronic or wet calibrations are easy to perform.


Automatically trigger control equipment and audible signals and continuously report and record solution data with fl exible outputs. The 900 features up to 3 relays; 2 remote alarms; 1 0-20/4-20 mA signal; 1 0-5/0-10 VDC signal; and 1 RS-485 ASCII serial signal. Relays output to any user-supplied control equipment requiring up to 250V each and can trigger on any input parameter. The 0-20/4-20 mA output can transmit a signal for any input parameter. 0-5/0-10 VDC can be scaled to optimize resolution and can output to a recorder, PLC, SCADA system, etc. 0-1 VDC is possible with optional resistor.


Myron L also backs these instruments up with expert dedicated technical support that assures installation and operation success. More information online: ilmt.co/PL/yLOR


For More Info, email: email:


For More Info, email: email:


Ultrameter llTM


For More Info, email: email:


E


Conductivity, Resistivity, TDS ORP/Free Chlorine Equivalent (FCE TM pH, Temperature


) 58456pr@reply-direct.com 61425pr@reply-direct.com


TM


www.myronl.com 760-438-2021


WWW.ENVIROTECH-ONLINE.COM


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