A titrimetric respirometer measuring the nitrifiable nitrogen in wastewater using insensor-experiment.
Measurement of nitrifiable nitrogen contained in wastewater by combining the existing respirometric and titrimetric principles is reported. During an in-sensor-experiment using nitrifying activated sludge, both the dissolved oxygen (DO) and pH in the mixed liquor were measured, and the pH was controlled at a set-point through titration of base or acid. A combination of the oxygen uptake rate (OUR), which was obtained from the measured DO signal, and the titration data allowed calculation of the nitrifiable nitrogen and the short-term biological oxygen demand (BOD) of the wastewater sample that was initially added to the sludge. The calculation was based solely on stoichiometric relationships. The approach was preliminarily tested with two types of wastewaters using a prototype sensor. Good correlation was obtained.
Department of Chemical Engineering, Advanced Wastewater Management Centre, University of Queensland, QLD 4072, Australia. zhiguo@cheque.uq.edu.au
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Yuan
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Bogaert
D000641:Ammonia / Q000032:analysis*; D015374:Biosensing Techniques; D002138:Calibration; D004867:Equipment Design; D006863:Hydrogen-Ion Concentration; D009584:Nitrogen / Q000032:analysis*; D010100:Oxygen / Q000032:analysis*; D014865:Waste Disposal, Fluid; D014867:Water / Q000032:analysis*; D014874:Water Pollutants, Chemical / Q000032:analysis*; D018508:Water Purification / Q000295:instrumentation / Q000379:methods*
D014874:Water Pollutants, Chemical; D014867:Water; D000641:Ammonia; D009584:Nitrogen; D010100:Oxygen