A new method for the simultaneous online measurement of sulfide and nitrate in wastewater is developed. A UV-VIS spectrometer was used. The sensor was calibrated by means of simultaneous online and offline measurements of sulfide and nitrate in batch tests carried out on a laboratory-scale sewer system. The developed calibration algorithm was successfully validated for both sulfide and nitrate measurement, with confidence limits of 2.7 mg S/L for total dissolved sulfide, and 7.5 mg N/L for nitrate. The online measurement of sulfide and nitrate enabled detailed evaluation of seven nitrate dosing strategies in the laboratory-scale sewer system, providing strong support to process optimisation. The dosage optimisation revealed that nitrate should be added at a location close to the point of sulfide control rather than at the beginning of a rising main, at a rate proportional to the expected hydraulic retention time (HRT) of the wastewater in the sewer section between the point of nitrate addition and the point where sulfide control is desired.
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Research Article|
February 01 2010
Simultaneous online measurement of sulfide and nitrate in sewers for nitrate dosage optimisation
Oriol Gutierrez;
1Advanced Water Management Centre, The University of Queensland, St Lucia, Brisbane, Australia E-mail: oriol@awmc.uq.edu.au; zhiguo@awmc.uq.edu.au
E-mail: oriol@awmc.uq.edu.au
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Luke Sutherland-Stacey;
Luke Sutherland-Stacey
2DCM Process Control, Point Cook, VIC, 3030, Australia E-mail: luke@dcmprocesscontrol.com
3Physics Department, University of Auckland, Symonds Street, Auckland, New Zealand
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Zhiguo Yuan
Zhiguo Yuan
1Advanced Water Management Centre, The University of Queensland, St Lucia, Brisbane, Australia E-mail: oriol@awmc.uq.edu.au; zhiguo@awmc.uq.edu.au
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Water Sci Technol (2010) 61 (3): 651–658.
Citation
Oriol Gutierrez, Luke Sutherland-Stacey, Zhiguo Yuan; Simultaneous online measurement of sulfide and nitrate in sewers for nitrate dosage optimisation. Water Sci Technol 1 February 2010; 61 (3): 651–658. doi: https://doi.org/10.2166/wst.2010.901
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