Skip to main content

Comparative Study of On-line Instruments for Monitoring Low Nutrient Concentrations

Buy Article:

$9.50 plus tax (Refund Policy)

Or sign up for a free trial

As many facilities in the Chesapeake Bay and beyond plan Enhanced Nutrient Removal (ENR) capital improvements / upgrades to achieve stringent effluent TN limits of less than 3 mg/l and TP < 0.18 mg/l, concern is growing about the operational complexities of monitoring and responding rapidly to changes in the biological processes. To effectively manage the ENR process one requires accurate real time data to monitor or control critical parameters such as DO, Phosphorus, Nitrate, Nitrite and Ammonia. This study was conducted at DCWASA's Blue Plains Advanced WWTP from January to June 2008. It was a part of a pilot study for Moving Bed Bioreactor (MBBR) technology. Three different online analyzers were installed at the MBBR pilot: (i) ChemScan (ii) Hach's Nitratax™ plus sc, and (iii) Endress+Hauser's nitrate analyzer. They were used to monitor the following nitrogen species, NOx-N, NO2-N, NH3-N and ortho-phosphate (PO4-P). The analyzers were installed at seven different locations and grabsamples were collected from all seven of those locations for comparison using laboratory analysis. The online readings and lab results were compared for each analyzer. This study was conducted over a six-month period but not all of the analyzers were in service at all times during this period.

This paper presents a comparison of lab and online data and offers some insights as to the accuracy of the various units. In addition, specific maintenance requirements for each type of analyzer were identified and are discussed in this paper.
No Reference information available - sign in for access.
No Citation information available - sign in for access.
No Supplementary Data.
No Article Media
No Metrics

Keywords: Enhanced Nutrient Removal; Online Analyzers; Online Nutrient Monitoring; Process Instrumentation

Document Type: Research Article

Publication date: 2009-01-01

More about this publication?
  • 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 These proceedings are not peer reviewed.

    A subscription to the Proceedings of the Water Environment Federation includes access to most papers presented at the annual WEF Technical Exhibition and Conference (WEFTEC) and other conferences held since 2000. Subscription access begins 12 months after the event and is valid for 12 months from month of purchase. A subscription to the Proceedings of the Water Environment Federation is included in Water Environment Federation (WEF) membership.

    WEF Members: Sign in (right panel) with your IngentaConnect user name and password to receive complimentary access. Access begins 12 months after the conference or event
  • Subscribe to this Title
  • Membership Information
  • About WEF Proceedings
  • WEFTEC Conference Information
  • Learn about the many other WEF member benefits and join today
  • Ingenta Connect is not responsible for the content or availability of external websites
  • Access Key
  • Free content
  • Partial Free content
  • New content
  • Open access content
  • Partial Open access content
  • Subscribed content
  • Partial Subscribed content
  • Free trial content
Cookie Policy
Cookie Policy
Ingenta Connect website makes use of cookies so as to keep track of data that you have filled in. I am Happy with this Find out more