BOD sensor for wastewater analysis-, design and calibration methods
DOI:
https://doi.org/10.15626/Eco-Tech.2003.043Keywords:
BOD sensor; Immobilised microorganisms; Biochemical oxygen demand; Calibration methods; Non-steady-state processes;Abstract
Water quality monitoring is an important aspect of water management concerning to the
pollution control. The removal of biodegradable organic substances is a very important
aspect of evaluation the treatment efficiency in a wastewater treatment plant (WWTP).
The amount of oxygen consumed by microorganisms to oxidise organic substances is
characterised by biochemical oxygen demand (BOD), a widely used parameter in
environmental analysis. The conventional method BOD determination is uneffective from
the point of view of short-term in situ measurements or on-line monitoring because it
measures the microorganisms endogenous and exogenous oxygen consumption over a
period of 5 or 7 days. BOD biosensors provide much faster results thereby allowing the
researches to overcome the weaknesses of the conventional method.
BOD sensor studied in present work is based on an amperometric oxygen sensor and an
easily replaceable biomembrane of mixed culture of microorganisms. Biosensor output
signal depends on the concentration of substrate that indicates the organic pollution of
waters. Biosensor output signal is analysed classically according to the steady-state
parameters and by the dynamic change of the response and also by the elaborated
mathematical model. The calibration of biosensor by steady-state method is based on the
change of biosensor response between an initial value and the stable end-point of the
signal. The dynamic method of measurement is based on the determination of the
maximum rate of change of output signal during experiment and the mathematical model
enables us to find the time constants characterising the non-steady-state processes in
BOD sensor. Studied biosensor can be used for the measurements of biochemical oxygen
demand in the concentration range 10-90 mg/L.
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References
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