A System Sensor to Monitor the Nitrification Process in an Aeration Basin
The HYDRA Nitrate Analyzer measures the concentration of dissolved nitrate as nitrogen (NO3- -N) in water. The sensor uses two electrodes to determine the NO3- -N concentration, a Nitrate Ion Electrode and a Chloride Ion Electrode.
It is designed for use in all kinds of water. Typical applications include monitoring environmental waters, lakes, streams and wells as well as wastewater treatment in aeration basins and The HYDRA Nitrate Analyzer measures the concentration of dissolved nitrate as nitrogen (NO3- -N) in water. The sensor uses two electrodes to determine the NO3- -N concentration, a Nitrate Ion Electrode and a Chloride Ion Electrode. effluent.
Nitrogen primarily enters a municipal wastewater treatment plant as ammonia/ ammonium compounds. Nitrification oxidizes the toxic ammonium ion into much less toxic nitrate ion using an aerobic activated sludge process. Denitrification reduces the nitrate ion (NO3- ) to nitrogen gas (N2) by an anoxic reaction in the same treatment basin or in a separate anaerobic digester. The NO3—N measurement can optimize the methanol being fed to the digester, minimizing cost, and also provides a trend of the total nitrogen (TN) in the effluent.
.The Nitrate Ion Electrode provides the primary measurement. A second electrode measures the Chloride ions in the sample. The chloride ion due to its similar size and charge to the nitrate ion, cause a positive interference in the measurement. The Chloride Ion Electrode measures the amount of chloride ion present in the sample and HYDRA C22 Analyzer subtracts the appropriate amount of signal from the Nitrate Measurement.
The rugged HYDRA-NO3 sensor has a 1 ¼” NPT rear facing thread for attaching an extension/ immersion tube for easy installation from catwalks or handrails. The HYDRA-NO3 sensor is submersible with an IP68 degree of ingress protection. A removable electrode guard facilitates easy electrode replacement when necessary. The HYDRA-NO3 sensor features internal signal conditioning that allows the sensor to be mounted up to 200 meters from the analyzer. The HYDRA Nitrate Analyzer displays all measurements on the Home Screen. Provides (2) 4-20 mA outputs and two Alarm Relays. It is configured to periodically actuate a cleaning cycle using the integral spray cleaner in the sensor. This minimizes the formation of biofilms and other coatings on the electrodes, keeping maintenance to a minimum. The period and duration of the cleaning cycle is user configurable. The 4-20 mA output is held at either the last value or a preset value during the cleaning.
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