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Waste management studies are usually done using calibrated and verified water quality models. Ravi River
located in Lahore, Pakistan is receiving untreated wastewater from number of outfalls and surface drains and thus
model calibration and verification are done using the data under the prevailing conditions. The water quality
objectives can only be met with wastewater treatment wherein the model rate coefficients may change. The objective
of this paper is to study the changes that may occur in these coefficients as a result of wastewater treatment. For this
purpose, long-term BOD analyses have been carried out using river water and wastewater after different degrees of
treatment. A laboratory scale biological reactor was used to study the effect of biological treatment on rate
coefficients at 3, 6 and 10 days detention times. The study results show that CBOD biokinetic rate coefficient (K)
reduces significantly from 0.25 day-1
for raw wastewater to 0.1 day-1 for the wastewater treatment for 3 days
detention time in the biological reactor. Further reductions in the value of K to 0.07 day-1
and 0.05 day-1
occurred for
a treatment level corresponding to 6 and 10 days detention times, respectively. The NBOD rate coefficient (Kn) was
found to be 0.08 day-1
for 3 days detention time and 0.06 day-1
after treatment in the biological reactor at 6 and 10 days
detention times.
Husnain Haider, Waris Ali. (2010) Effect of Wastewater Treatment on Bio-kinetics of Dissolved Oxygen in River Ravi, Pakistan Journal of Engineering and Applied Sciences, Volume 6, Issue 1.
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