Jan. 27, 2021 – Anaheim, Calif. – Plant engineers responsible for water and wastewater treatment in municipal and industrial plants will find that Electro-Chemical Devices (ECD) now offers them two different highly accurate and reliable solutions to measuring total organic carbon (TOC) levels to protect water quality.

Organic compounds are found in almost all types of water–from natural and treated drinking water to process water, cooling water, and water used in pharmaceuticals and food production. Too much organic contamination in the water interferes with many municipal and industrial processes. For example, when disinfecting drinking water an excess of organic matter can foster microbiological growth or indicate the presence of other undesirable byproducts.

Measuring TOC levels continuously with online analyzers is a highly effective, dependable way to monitor water and wastewater for hazardous contaminants. Depending on the plant, the process and the water quality requirements, plant engineers typically select one of the industry’s two most popular sensing techniques to measure TOC.

The ECD Model 3S TOC Analyzer measures TOC using the UV persulfate oxidation method with carbon dioxide detection by nondispersive infrared absorption (NDIR). In comparison, the ECD Model UV-6 TOC Analyzer measures TOC levels with a UV absorption correlation technique. Both ECD analyzer models provide excellent TOC measurement accuracy and repeatability to ensure compliance with water quality standards.

ECD model 3S TOC analyzer

ECD’s Model 3S TOC Analyzer measures TOC in liquid samples ranging from 0–5 mg/L to 20,000 mg/L. The UV persulfate oxidation method conforms to EPA, DIN, CE, ASTM, and NAMUR regulations as well as meeting the requirements of ISO and EN directives.

The highly dependable Model 3S TOC Analyzer features a fast-loop reservoir with a floating level sensor. If no sample reaches the reservoir for more than a pre-set time, the analyzer switches automatically to standby mode. As soon as the sample flow re-starts, the analyzer switches back to the analysis cycle automatically. Air bubbles are removed in the reservoir before the sample enters the analyzer.

The sample first is acidified and then sparged to remove inorganic carbon. The remaining liquid is mixed with sodium persulfate and digested by two high-performance reactors. The resulting CO2 is then stripped from the liquid and, after drying, its concentration is measured by a NDIR analyzer to determine TOC levels.

Model UV-6 TOC analyzer

An alternative TOC analytical method is the UV correlation technique performed by the ECD UV-6 Analyzer. The analyzer is factory configured by ECD to measure TOC as correlated with the 254 nm wavelength and the final correlated calibration is done by matching the TOC measured to the on-site grab sample TOC value.

The Model UV-6 Analyzers are a family of on-line sampling analyzers that use UV absorption to perform an analysis. The analyzers are configured to perform analysis over a wide range of values for each parameter measured, nitrate, color, or the correlation at 254 nm wavelength for TOC, COD or BOD.

This technique measures TOC based on the measurement of UV absorption in the sample. The absorbance of the solution or gas is measured though a quartz flow cell at the chosen parameter’s specific wavelength using a long life Xenon light source and photo-detectors. The absorbance level is related to the sample concentration according to the “Beer-Lambert Law.”

The UV6 Analyzer features an easy-to-use reagent-less design. The UV spectroscopy measuring principle requires no chemical reagent resulting in very low operating and maintenance costs. There are no reagent chemicals to order, store, track and dispose at the end of their useful life, simplifying the entire process.

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Ideal for Municipal Wastewater Treatment Plants

Anaheim, CA—August 25—2020—Engineers at municipal wastewater treatment plants tasked with the removal of ammonia will find the versatile CA-6 Colorimetric Ammonia Analyzer from Electro-Chemical Devices (ECD) helps them protect water quality with confidence prior to releasing effluent into re-use systems, groundwater recharge basins and surface water systems.

Exposure to ammonia over time is toxic to aquatic life. The U.S. Environmental Protection Agency (EPA) recommends a limit of 0.02 ppm as NH3 in freshwater or marine environments. Total ammonia levels, at this limit, can range from 160 ppm at a pH6 level and at temperature of 41°F (5°C) to 0.06 ppm at a pH9 level and temperature of 77°F (25°C).

Wastewater treatment plants frequently use the Nitrification method to remove ammonia. Nitrification is a two-step process for removing ammonia from wastewater using two different types of autotrophic bacteria that oxidize ammonia to nitrite (nitrosomonas) and then oxidize nitrite to nitrate (nitrobacter).

The ECD CA-6 Ammonia Analyzers help plant technicians determine the effectiveness of the treatment process prior to effluent discharge. With its adjustable cycle time, the CA-6 Ammonia Analyzer reduces the cost of treatment by minimizing the use of consumable reagents while still getting the job done effectively. Technician time is reduced as well, freeing staff for other important tasks.

The CA-6 Analyzer is an on-line sequential sampling analyzer. It automatically performs a controlled sequence of sampling, analysis and then results processing is performed and repeated using colorimetric methods with a reagent. The colorimetric method of water analysis relies on an LED light source and a heated colorimetric cell, which has been designed for measuring trace amounts of Ammonia in water.

The versatile CA-6 Colorimetric Analyzer can be configured to measure Ammonia or a wide range of other substances with a choice of multiple parameters: ppb, ppm and mg/L. It measures Ammonia over a wide range from trace 0 to 50 mg/L. Three separate Ammonia measurement ranges are available: 0 to 1.0 mg/L, 0 to 10 mg/L and 0 to 50 mg/L.

The CA-6 Colorimeters make two measurements during an analysis cycle. The first measurement is of the raw sample which sets the base line for the compensation of color, turbidity and optical characteristics of the cell. The second measurement occurs after the color forming reagents have been added to the sample, mixed and adequate time has passed to allow for color formation. The concentration is calculated using the difference between the two absorbance measurements and the stored calibration information in the analyzer.

The CA-6 Colorimetric Analyzer is equipped with a graphic touchscreen interface showing measured values and status information. It provides users with easy access to menus and functions in multiple languages. There is an integrated data logger onboard with USB download capability for history tracking.

The display’s home screen shows the measured parameter, the status, % reagent volumes, time and Menu choices. The on screen HELP menu includes information on Start Up, Shut Down, Start/Stop Commands, Calibration, Function List, Programing, Maintenance and Troubleshoo1ng.

Outputs provided with the CA-6 Analyzer include two 4-20 mA outputs for measured data, and it also includes a Modbus compatible RS485 RTU. Four programmable SPDT relays are available to provide alarm capability.

The CA-6 Colorimetric Analyzers is designed with two compartments that separate critical electronics from the wet process. The standard model is recommended for indoor use and rated NEMA IP54 for dust and water ingress. The operating temperature range of the CA-6 Analyzer is 41 to 113 °F (5 to 45°C).

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