title: Denitrifying activity measurements using an anoxic titration (pHstat) bioassay.
abstract: An anoxic titrimetric test was investigated for measuring denitrifying activity in an activated sludge system. The method measures the amount of acid that is required to maintain the pH set-point value in a batch denitrification experiment. An iterative algorithm was implemented to extract nitrate uptake rate (NUR) data from titration data, since the accumulation and depletion (stripping) of reaction by-products HCO3- and CO2 affects the direct calculation of denitrifying activity from titration data. This method was performed using an automatic pH-stat acid dosing system, and the data were analysed using the simulation software package, AQUASIM.
authors.affiliation: Pollution Research Group, School of Chemical Engineering, University of Natal, Durban, South Africa. foxonk@nu.ac.za
authors.forename: K M
authors.initials: KM
authors.lastname: Foxon
authors.forename: C J
authors.initials: CJ
authors.lastname: Brouckaert
authors.forename: A
authors.initials: A
authors.lastname: Rozzi
mesh_terms: D001331:Automation; D001681:Biological Assay; D004784:Environmental Monitoring; D006863:Hydrogen-Ion Concentration; D009584:Nitrogen / Q000378:metabolism*; D012984:Software; D014865:Waste Disposal, Fluid
chemical_list: D009584:Nitrogen