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Measuring Biodegradability of Industrial Wastewater by a Low-cost differential Respirometer

Author Affiliations

  • 1Department of Civil and Environmental Engineering, Shahjalal University of Science and Technology (SUST), Sylhet, BANGLADESH
  • 2 Department of Chemical Engineering and Polymer Science, Shahjalal University of Science and Technology (SUST), Sylhet, BANGLADESH
  • 3
  • 4

Res. J. Engineering Sci., Volume 2, Issue (4), Pages 1-4, April,26 (2013)


A low-cost differential manometric respirometer was fabricated to assess the biodegradability of industrial wastewater. Test samples were collected from four different industrial sources i.e. dairy, tannery, pharmaceutical and dyeing industry. In this study, various parameters such as ultimate oxygen uptake (OU∞), reaction rate constant (k), seed dependent biodegradability (αs) and relative oxygen uptake rate (R%) were calculated to assess the overall biodegradation criteria of the wastewater samples. Respirograms were plotted to evaluate the oxygen uptake rate (OUR) profile. Rate of biodegradation was found maximum for dairy industrial source while sample from dyeing industry exhibited retardation effects on the microbial biodegradation process.


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