Abstract
Aerobically activated sludge processing was carried out to treat terylene artificial silk printing and dyeing wastewater (TPD wastewater) in a lab-scale experiment, focusing on the kinetics of the COD removal. The kinetics parameters determied from experiment were applied to evaluate the biological treatability of wastewater. Experiments showed that COD removal could be divided into two stages, in which the ratio BOD/COD (B/C) was the key factor for stage division. At the rapid-removal stage with B/C>0.1, COD removal could be described by a zero order reaction. At the moderate-removal stage with B/C<0.1, COD removal could be described by a first order reaction. Then Monod equation was introduced to indicate COD removal. The reaction rate constant (K) and half saturation constant (K S) were 0.0208–0.0642 L/(gMLSS) h and 0.44–0.59 (gCOD)/L respectively at 20°C–35°C. Activation energy (E a) was 6.05×104 J/mol. By comparison of kinetic parameters, the biological treatability of TPD wastewater was superior to that of traditional textile wastewater, such as papermaking, beer, phenol wastewater, etc. The expected effluent quality strongly related to un-biodegradable COD and kinetics rather than total COD. The results provide useful basis for further scaling up and efficient operation of TPD wastewater treatment.
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Guan, Bh., Wu, Zb. & Xu, Gl. Kinetics of aerobically activated sludge on terylene artificial silk printing and dyeing wastewater treatment. J. Zheijang Univ.-Sci. 5, 441–449 (2004). https://doi.org/10.1631/jzus.2004.0441
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DOI: https://doi.org/10.1631/jzus.2004.0441
Key words
- Process kinetics
- Aerobically activated sludge
- COD (chemical oxygen demand)
- Biological treatability
- Printing and dyeing wastewater