Abstract
The present paper deals with the determination of pollutant removal efficiency of date pit-activated carbon (DPAC) from petroleum industry wastewater in a continuously operating inverse fluidized bed (IFB). The effect of physical and operating parameters of the adsorption process on total organic carbon (TOC), biological oxygen demand (BOD) and chemical oxygen demand (COD) of the petroleum wastewater were investigated through rigorous experimentation (184 data sets). The pollutant removal efficiency was found to be highly satisfactory with more than 95% reduction in COD, BOD and more than 88% reduction in TOC achieved under optimum condition within 160 min of wastewater circulation time through inverse fluidized DPAC bed. Three empirical correlations for percentage reductions of TOC, BOD and COD as a function of eight different physical and operating parameters were developed by dimensional analysis and the exponents were evaluated using 92 assorted experimental data and validated by the residual 92 data. The empirical equations developed were found to be well applicable within the range of dimensionless parameters \({Ar}_{m}\), \({Re}_{p}\), (\({\rho }_{l}/{(\rho }_{l}-{\rho }_{p}))\) and the dimensionless bed height of 1.663 to 55.4211, 0.1089 to 2.8181, 3.8644 to 4.3137 and 25.423 to 36.0169, respectively.
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Abbreviations
- AC:
-
Activated carbon
- v l (LT− 1):
-
Actual velocity
- BOD (ppm):
-
Biological oxygen demand
- h bi (m):
-
Bed expansion
- COD (ppm):
-
Chemical oxygen demand
- t c (T):
-
Contact time
- t cdim = \(\frac{{\mu }_{l} {t}_{c}}{{d}_{p}^{2}{(\rho }_{l}-{\rho }_{s})}\) :
-
Dimensionless circulation tank
- \({{h}_{b}}_{dim}= \frac{{h}_{bi}}{{d}_{p}}\) :
-
Dimensionless initial bed height
- DPAC:
-
Date pit-activated carbon
- g (LT− 2):
-
Gravitational acceleration
- IFB:
-
Inverse fluidized bed
- \(Ar_{m}= \frac{{ dp^{3} \left( {\rho l - \rho_{s} } \right)^{2} g}}{{\mu l^{2} }}\) :
-
Modified Archimedes number
- \({\mathrm{Re}}_{p}\) :
-
Modified Reynolds number
- F NET :
-
Net force
- dp (L):
-
Particle diameter
- \({\text{Re}}_{p} = \frac{{dp (\rho l - \rho_{s} )^{ } v_{s} }}{{ \mu_{l} }}\) :
-
Particle Reynolds number
- PBOD :
-
Percentage BOD
- PCOD :
-
Percentage COD
- PTOC :
-
Percentage TOC
- v s (LT− 1):
-
Superficial velocity
- h s :
-
Static bed
- T c (T):
-
Time for complete cycle
- TOC (ppm):
-
Total organic carbon
- t c (sec):
-
Time of recirculation
- v t (L):
-
Total volume of wastewater in the feed wastewater tank
- \({\Delta \rho }_{dim}=\) \(\frac{{\rho }_{l} }{{{\rho }_{l}}- {\rho }_{s}}\),:
-
Dimensionless density difference
- ρ l (ML− 3):
-
Liquid density
- µ l (ML− 1T− 1):
-
Liquid viscosity
- ρ s (ML− 3):
-
Particle density / Solid density
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Acknowledgements
The authors would like to acknowledge the support provided by the National United Dates Company L.L.C, Oman Oil Refineries and Petroleum Industries Company, SAOC (ORPIC). They would also like to thank National University of Science and Technology (NUST), Muscat, Oman and National Institute of Technology Durgapur, India.
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Sakhile, K., Sarkar, J.P., Gupta, P. et al. Removal of Major Pollutants from Petroleum Wastewater by Adsorption with Activated Carbon Derived from Date Seed in an Inverse Fluidized Bed. Arab J Sci Eng 48, 8557–8569 (2023). https://doi.org/10.1007/s13369-022-07109-5
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DOI: https://doi.org/10.1007/s13369-022-07109-5