This page cannot be printed from here

Please use the dedicated print option from the 'view' drop down menu located in the blue ribbon in the top, right section of the publication.

screenshot of print menu option

Description: From Seasonal to Year-round Nitrification: Performance Evaluation of North America's...
From Seasonal to Year-round Nitrification: Performance Evaluation of North America's Largest MABR Installation
Abstract
This study evaluated the performance of North America’s largest MABR installation under different operational and seasonal conditions. Total nitrogen (TN) removal improved from 40- 50% when the plant was in a conventional activated sludge configuration to 75-85% after the MABR upgrade. The MABR reduced effluent ammonia during winters and nitrate concentrations during summer to below 10 mg-N/L in both the cases. The nitrification rate in the MABR varied between 0.7-2.2 gNm-2 d -1 with lower nitrification rates observed during reduced airflow operation and winter conditions. The development of thicker biofilms limited ammonia diffusion into the biofilm that resulted in reduced nitrification rate. Increasing the flow of sparging air was able to control the biofilm thickness to improve nitrification. The denitrification rate in the MABR process was between 100-200 gNm-3 d -1 which followed a close trend with nitrification rate. The nitrification rate in the MABR was found to be the rate limiting step for TN removal in the process.
Addition of an MABR to an existing conventional activated sludge process substantially improved TN removal and reduces seasonal spikes in effluent ammonia. The improved TN removal in the plant was due to elevated levels of simultaneous nitrification and denitrification in the hybrid MABR process.
SpeakerLakshminarasimman, Narasimman
Presentation time
15:30:00
15:50:00
Session time
15:30:00
17:00:00
SessionAlternative Approaches to Intensify Secondary Treatment
Session locationRoom S404a - Level 4
TopicIntermediate Level, Municipal Wastewater Treatment Design, Nutrients
TopicIntermediate Level, Municipal Wastewater Treatment Design, Nutrients
Author(s)
Lakshminarasimman, Narasimman
Author(s)N. Lakshminarasimman 1; D. Celmer-Repin 2 ; J. Mank 3; J. Gagnon 4; M. Reeve 5; J. Peeters 6; W.J. Parker 1; N. Lakshminarasimman 1;
Author affiliation(s)Department of Civil and Environmental Engineering, University of Waterloo, ON, Canada 1; Region of Waterloo, ON, Canada 2 ; Ontario Clean Water Agency, ON, Canada. 3; Veolia Water Technologies 4; Veolia Water Technologies 5; Veolia Water Technologies 6; Department of Civil and Environmental Engineering, University of Waterloo, ON, Canada 1; Department of Civil and Environmental Engineering, University of Waterloo, ON, Canada 1;
SourceProceedings of the Water Environment Federation
Document typeConference Paper
PublisherWater Environment Federation
Print publication date Oct 2023
DOI10.2175/193864718825159017
Volume / Issue
Content sourceWEFTEC
Copyright2023
Word count14

Purchase price $11.50

Get access