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March 2013 Water Quality updated 2012 Emerging Technologies Technology Summary Nutrient Analyzers, Probes, and Electrodes Objective: In situ, real-time measurement of ammonia, nitrate, orthophosphate, and total phosphorus concentration for process monitoring and control of nitrification, denitrification, and phosphorus removal. Description: Analyzers State of Development: Innovative. Analyzers pump a small amount of sample to a device where reagents are involved usually to produce a color-generating reaction that is then measured for intensity to determine concentration. These devices are available for ammonia, phosphate, and total phosphorus. Metrohm-Applikon Alert: This colorimetric analyzer uses differential absorbance colorimetry to determine ammonia, nitrate, nitrite, or phosphorus. The Alert colorimeter takes as color measurement using long life LEDS, first to establish the initial color and after reagent addition to determine the developed color. The differential technique compensates for fouling of the cell and for initial sample color. WTW Trescon: This is an analyzer for orthophosphate or total phosphorus. The orthophosphate analyzer uses the vanadate/molybdate method to color the sample yellow. The color intensity is measured photometrically and reported as phosphorus content. Ranges are 0.05 to 3.00 mg P/L, 0.1 to 10 mg P/L, or 0.1 to 25 mg P/L. For total phosphorus analysis, a digestion unit is required to provide a chemical-thermal digestion that will convert all phosphorus in the sample to phosphate. The phosphate is measured using the molybdenum blue method. Ranges are 0.01 to 3.00 mg P/L, and 0.3 to 100 mg P/L. ChemScan UV Series: This consists of an online single or multiple parameter analyzers using full-spectrum UV-visible detection with chemometric analysis of spectral data. Multiple sample lines allow sampling from several locations to the same analyzer. The analyzer is script driven and can perform rapid sequential analysis with or without the assistance of chemical reagents. Nitrate analysis or a separate analysis (or both) of nitrite are performed according to the direct analysis of spectra from the sample. Ammonia analysis is reagent-assisted using bleach and hydroxide reagents. The analyzer contains an internal manifold to provide automatic zeroing, cleaning, and managing multiple sample lines. A variety of accessories are available, including sample pumps, filters, and external controllers. Hach AMTAX: This consists of an ammonia sampler with gas-sensitive electrode, low range 0.5 mg/L to 20 mg NH3-N/L at 3 percent accuracy. It samples at an adjustable frequency of 5 to 120 minutes, mixes the sample with sodium hydroxide to convert all ammonium to free ammonia, expels ammonia gas from sample, redissolves it in the indicator reagent and measures color with a colorimeter. It then pumps the sample to the analyzer which is mounted out of process. The analyzer requires a consumable reagent. Hach PHOSPHAX: This is a continuous flow analyzer for ortho-Phosphate using the photometric methods with vanado-molydan. It has a five minute cycle time for each measurement and allows for adjustable intervals from 5 minutes to 120 minutes. Measurement range is 0.05 - 15 mg/L PO4-P. Accuracy at the low range is 2% ± 0.05 mg/L. The unit features daily automatic cleaning and calibration. UV/Vis Probes WTW NitraVis®: This consists of in situ, real-time spectral measurement (UV and Visibility [VIS] range of 200 to 750 nm) of nitrate concentration without filtering. Interferences, such as those caused by turbidity, are detected and compensated for. The process operates in media at temperatures of at least 32°F, with a pH between 4 and 9, and contains less than 5,000 mg/L chloride. Automatic cleaning occurs with compressed air before each measurement. The measuring range is 0.1 to 100 mg/L NO3-N with accuracy of ±3 percent. Hach Evita: This nitrate probe uses UV absorption to measure nitrate concentration. The probe is immersed in wastewater and the ion-specific membrane allows the appropriate ions to be transferred to the carrier solution so no sample preparation is necessary and interference from bacteria and particles is virtually Wastewater Treatment and In-Plant Wet Weather Management 5-9PDF Image | Emerging Tech for Wastewater Treatment
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