HIGH-FREQUENCY BROMIDE SENSOR PERFORMANCE DURING DENITRIFYING BIOREACTOR TRACER TESTING

Luciano Alves de Oliveira, Bryan Maxwell, Reid Christianson, Laura E. Christianson

Research output: Contribution to journalArticlepeer-review

Abstract

Bromide (Br-) tracer tests are an important environmental monitoring method for assessing internal hydraulics in denitrifying woodchip bioreactors. The objective was to assess performance of relatively new high-frequency Br- sensing technology to help resolve challenges associated with sampling uncertainty and failure during bioreactor tracer tests. A Seametrics TempHion™ Bromide Logger was used to: (1) continuously log Br- concentrations at least every 30 s during three tracer tests in the field and (2) determine Br- concentrations in sample bottles post-hoc following eight tracer tests (sampling frequency in the field: every 2 to 300 min). Both were compared to lab-analyzed Br- concentrations. The sensor underreported Br- concentrations at two real-time tracer tests and overreported during one test, but this mainly impacted the tracer metric of percent recovery. While Br- sensor deployment during a tracer test is the ideal use of this convenient tool, use of the sensor post-hoc in collected bottles matched the lab-analyzed concentrations more closely based on the Root Mean Square Errors and the Mean Absolute Errors. The sensor’s ability to collect large amounts of high-resolution concentrations did not necessarily add value because most tracer metrics were interpolated with reasonable accuracy from the discrete lab-analyzed samples. The relatively continuous nature of the sensed concentrations, however, along with ease of deployment were important sensor benefits.

Original languageEnglish (US)
Pages (from-to)639-644
Number of pages6
JournalApplied Engineering in Agriculture
Volume39
Issue number6
DOIs
StatePublished - 2023
Externally publishedYes

Bibliographical note

Publisher Copyright:
© 2023 American Society of Agricultural and Biological Engineers.

Keywords

  • Conservative tracer test
  • Continuous sensor
  • Double peak
  • Subsurface drainage
  • Woodchip bioreactor

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