Related Experiment Video
Updated: Jun 12, 2026

A Novel Bioreactor for High Density Cultivation of Diverse Microbial Communities
Published on: December 25, 2015
Temperature effects on nitrification in polishing biological aerated filters (BAFs)
Jeong Hyub Ha1, Say Kee Ong, R Surampalli
1Department of Civil and Environmental Engineering, Sejong University, Seoul 143-747, Korea.
Abstract:
The effects of temperature on nitrification in a polishing biological aerated filter (BAF) were investigated using a 75-mm diameter pilot-scale BAF with a gravel media size of 5 mm and a depth of 1.7 m. Influent soluble chemical oxygen demand (sCOD) and ammonia-nitrogen (NH3-N) concentrations were approximately 50 mg/L and 25 mg/L simulating the effluent from an aerated lagoon system. For an influent wastewater temperature of 6.5 degrees C, approximately 95% of NH3-N was nitrified at a hydraulic retention time (HRT) of 2 hours. By recirculating 200% of the effluent back into the BAF for a HRT of 1 hour and at 6.5 degrees C, NH3-N percentage removal improved from 54% to 92%. For NH3-N loading larger than 0.9 kg NH3-N/m3-day at 24 degrees C, the mass of NH3-N removed in kg NH3-N/ m3-day reached an asymptotic value of 0.63 kg NH3-N/m3-day. The NH3-N concentrations within the column at different temperatures were modelled using zero-order biotransformation rate kinetics. The results showed that gravel BAF operating at an HRT of 1 hour with 100% or 200% recirculation can be used as an add-on technology for nitrification for cold weather conditions.
More Related Videos
08:05Measurement of the Potential Rates of Dissimilatory Nitrate Reduction to Ammonium Based on 14NH4+/15NH4+ Analyses via Sequential Conversion to N2O
Published on: October 7, 2020
07:34Biogas Purification through the use of a Microalgae-Bacterial System in Semi-Industrial High Rate Algal Ponds
Published on: March 22, 2024
Related Concept Videos
Bioreactor Controls-I
Bioreactor Controls-II
Bioreactor Design and Operational System
Biological Treatment of Effluent and Waste Water
Microbial Wastewater Treatment
Filtration