Denitrifying activity measurements using an anoxic titration (pHstat) bioassay.
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.
Foxon
K M
KM
Pollution Research Group, School of Chemical Engineering, University of Natal, Durban, South Africa. foxonk@nu.ac.za
Brouckaert
C J
CJ
Rozzi
A
A
D001331:Automation; D001681:Biological Assay; D004784:Environmental Monitoring; D006863:Hydrogen-Ion Concentration; D009584:Nitrogen / Q000378:metabolism*; D012984:Software; D014865:Waste Disposal, Fluid
D009584:Nitrogen