Abstract
This work evaluated the UASB-septic tank performance using different kinetic models that correlated process efficiency and methane production with hydraulic and organic loading rates through experiments with five different HRT (48 h, 36 h, 24 h, 18 h, and 12 h) using synthetic domestic wastewater. The modified Stover-Kincannon model provided the best fitting to calculate kinetics constants, with an R2 above 98% for linear regression, and predicted the effluent COD more accurately than the other models. Methane yield was 0.3294 L CH4/g COD removed, being closer to the theoretical value, and the Van der Meer and Heertjes model had the highest R2 for methane production. Organic matter and solids removal were 45% for TS, 70% and 68% for total and soluble COD, and 85% for TSS. Pollutant removal markedly decreased when the reactor operated HRT below 24 h; thus, it is recommended to operate the UASB-septic tank at this HRT.
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Data availability
The dataset generated and analyzed during the current study are openly available in the Mendeley data repository at https://doi.org/10.17632/dx7gjkhnkj.1.
Abbreviations
- μ :
-
Specific biomass growth rate
- μ max :
-
Maximum specific biomass growth rate
- ABR:
-
Anaerobic baffled reactors
- COD:
-
Chemical oxygen demand
- DEWATS:
-
Decentralized wastewater treatment systems
- E:
-
Removal efficiency
- FS:
-
Fixed solids
- HRT:
-
Hydraulic retention times
- k 1 :
-
First-order rate constant
- k 2(s) :
-
Second-order substrate removal constant
- K B :
-
Saturation constant
- k d :
-
Endogenous decay coefficient
- K s :
-
Half-velocity constant
- k sg :
-
Van der Meer and Heertjes kinetics constant
- M:
-
Specific methane production rate
- M B :
-
Ratio constant of biogas production
- M max :
-
Maximum specific biogas production rate
- OLR:
-
Organic loading rate
- PA/TA ratio:
-
Ratio between partial and total alkalinity
- PVC:
-
Polyvinyl chloride
- S:
-
Effluent substrate concentration
- So:
-
Influent substrate concentration
- SVI:
-
Sludge volume index
- TS:
-
Total solids
- UASB:
-
Upflow anaerobic sludge blanket
- U max :
-
Maximum substrate utilization rate constant
- USEPA:
-
Environmental Protection Agency of United States
- V:
-
Volume reactor
- VFA:
-
Volatile fatty acids
- VS:
-
Volatile solids
- X:
-
Reactor biomass concentration
- Xe:
-
Effluent biomass concentration
- Xo:
-
Influent biomass concentration
- Y:
-
Synthesis yield coefficient
- β:
-
Growth parameter of the Contois model
- θ:
-
Hydraulic retention time
- θc :
-
Solids retention time
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Acknowledgements
The authors express their gratitude to Dr. Morgan-Sagastume, Margarita Cisneros, Jesús Ortega, and Andrea Rodríguez for their assistance in experimental work and data analysis. The first author thanks the National Council for Science and Technology (CONACyT) for a doctoral scholarship.
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This research did not receive any specific grant from funding agencies in the public, commercial, or not-for-profit sectors.
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MLSP and VMA did the conceptualization and were the major contributors in writing the manuscript; ALSD collected and analyzed the UASB-septic tank data; MLSP also performed the mathematical modeling to obtain the kinetics parameters and analyzed the UASB-septic tank data; MVM and DCV validated and analyzed the UASB-septic tank data, and contributed in writing the manuscript. All authors read and approved the final manuscript.
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Santiago-Díaz, Á.L., Mugica-Álvarez, V., de los Cobos-Vasconcelos, D. et al. Performance evaluation and kinetic modeling of an upflow anaerobic sludge blanket septic tank for domestic wastewater treatment. Environ Sci Pollut Res 28, 67414–67428 (2021). https://doi.org/10.1007/s11356-021-15141-5
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DOI: https://doi.org/10.1007/s11356-021-15141-5