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Results are provided from an evaluation of on-line nitrate and nitrite monitoring systems, utilizing quantification of ultraviolet absorption, tested directly in mixed liquor at the Budd Inlet Wastewater Treatment Plant (BITP) in Olympia, Washington. Included are a discussion of alternatives
for on-line measurement, technical background regarding nitrate/nitrite monitoring systems, descriptions of several nitrate/nitrite monitoring systems tested, results from the in-plant testing, and evaluation of results. Additionally, the rationale and role for the on-line monitoring
system in the BITP process control scheme is discussed. Recommendation for system modifications to implement automation of methanol feed are provided to optimize denitrification, based on the results of a process evaluation. For this study, three systems that use ultraviolet spectrophotometry
for nitrate/nitrite quantification were evaluated at the BITP. These systems each use a different approach to quantify nitrate/nitrite, as well as to compensate for interference from other nitrogen species, organics, and suspended pArticles. Results from the on-line nitrate/nitrite
testing were compared against laboratory analysis conducted with methods from Standard Methods (APHA, WEF, AWWA). The analytical precision and bias of the three on-line systems were quantified relative to the laboratory methods. Also, results from recent operation of the selected system
are provided. The results and accompanying discussion illustrate the potential for, and challenges of, on-line nitrate/nitrite analysis in high solids streams such as mixed liquor.
Proceedings of the Water Environment Federation is an archive of papers published in the proceedings of the annual Water Environment Federation® Technical Exhibition and Conference (WEFTEC® ) and specialty conferences held since the year 2000. These proceedings are not peer reviewed. WEF Members: Sign in (right panel) with your IngentaConnect user name and password to receive complimentary access.