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Emerging Technologies Water Quality updated 2012 March 2013 Technology Summary Nutrient Analyzers, Probes, and Electrodes (continued) eliminated. It uses deionized water that needs to be refilled every 10 weeks. The measuring range is 2 to 50 mg/L NO3-N with accuracy of ±10 percent. It can take readings about every 13 minutes. Hach NITRATAX: This probe is based on UV light absorption. The photometer measures the primary UV 210 beam, and a second beam at 350 nm provides a reference standard. Measuring range is 0.1 to 100 mg/L NO3-N at 5 percent accuracy. It includes a self-cleaning wiper system. Ion Selective Electrodes WTW ISE: Direct immersion ion selective electrodes (ISEs) are available in combination ammonium/nitrate (VARiON), ammonium with potassium compensation, and nitrate with chloride compensation. These all provide continuous measurement of process concentrations. Ranges are 0.1 to 100 mg/L or 1 to 1,000 mg/L as nitrogen for either parameter. Biochem/Myratek Sentry C-2: This electrode is based on ISE technology. A sample is isolated in the measuring chamber and ammonia and the nitrate values established. Calibration using the standard addition method is performed automatically at user-set intervals. Installation takes less than 1 hour; maintenance less than 15 minutes per week. Hach NH4D Ammonium Probe: This consists of direct immersion ISE for measuring ammonium from 0.2 to 1,000 mg/L NH4-N with 5 percent accuracy. Potassium interference is compensated by including a potassium ISE. Provides continuous measurement. Can be provided with optional air cleaning system to reduce maintenance frequency. Endress + Hauser ISEMax: The ISEMax unit uses a single probe to measure both ammonium and nitrate continuously using ISE technology. The range is 0 to 1,000 mg/L ammonium-N, 0.1 to 1,000 mg/L nitrate-N. Up to three electrodes can be included in a single probe. Comparison to Established Technologies: Monitoring used to be done by taking samples and analyzing them for various parameters in laboratories. Lab analyses take time, and one cannot resolve a problem until the results are gathered. These monitoring technologies provide real-time or near real-time conditions in the treatment system through continuous monitoring. Immediate feedback helps operators immediately take corrective action if a shock or toxic load occurs. It can also allow for timely process adjustments that can reduce energy consumption and chemical usage where applicable. ISEs are generally the lowest cost to purchase and maintain. Ammonia ISE probes can be purchased for $6,500 to $15,000. Analyzers are most costly and maintenance intensive but could be useful for compounds for which ISE probes are not available. Available Cost Information: Approximate Capital Cost: Equipment costs vary from approximately $6,000 to $25,000 depending on capabilities and features. Approximate O&M Costs: Costs vary with frequency of calibration requirements, cleaning, and analyzer reagents. Analyzers have greatest operation and maintenance followed by UV/VIS. ISEs are least costly to maintain. Vendor Name(s): Metrohm-Applikon De Brauwweg 13 PO Box 149 3100 AC Scheidam The Netherlands Telephone: +31 10 298 35 55 Email: analyzers@metrohm-applikon.com Installation(s): Many installations are throughout the US: Metrohm-Applikon Hampton Roads Sanitation District Norfolk, VA Hach AMTAX Messerly WWTP Augusta, GA 5-10 Wastewater Treatment and In-Plant Wet Weather ManagementPDF Image | Emerging Tech for Wastewater Treatment
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