Online Ammonia Analyzers for Water and Wastewater Treatment Applications

This report presents the results of field testing conducted on online ammonia analyzers in actual "field conditions" of a wastewater secondary activated sludge aeration basin, environment. This report includes evaluations of eight online ammonia analyzers representing three different technologies (ion-selective electrodes–ISE, colorimetric, and UV absorbance) that were tested under field conditions, over a period of 3 months (90 days) at the City of Houston's Beltway Wastewater Treatment Plant in Houston, Texas.

This report contains evaluations of: ASA, Inc., ChemScan, Model UV 2150 NH3-N; Bran + Luebbe, Model 90 S ISE; Danfoss Analytical, Model Evita Insitu Colorimetric; FPM Analytics, Div. of ATMI, Model IonChem 2005 Ammonia ISE; Hach Company, Model APA 6000 NH3-N ISE; Waltron Ltd., Model lAl-8232 Ammonia Monitor ISE, WTW Measurement Systems, Inc., Model TresCon BA43111e02 NH4-N ISE; and Zellweger Analytics, Model Z polymetron 8810 Ammonia ISE.

This test was sponsored by the Instrumentation Testing Association (ITA) and the City of Houston, Department of Public Works and Engineering, Wastewater Quality Control Laboratory and Beltway Wastewater Treatment Facility.