Abstract
In this work, an electrokinetic-based (EK) reactor was coupled with a biodegradation process to improve the performance of treatment facilities in cold regions. Subsequently, the effects of electric current density (CD) and temperature on chemical oxygen demand (COD) and nutrient removal were investigated in a series of EK bioreactors. Moreover, the potential electro-stimulation of microbial biomass was evaluated. In this experiment, the treatment of synthetic wastewater at different operational temperatures (8, 13, and 20 °C), CD ranging between 1 and 2 mA/cm2, and electrical exposure regimes were performed. The results indicated that, at the lower temperature of 8 °C, the EK-based bioreactor with a CD of 1.5 mA/cm2 at 60 s–ON/180 s–OFF contact mode achieved superior removal efficiencies of impurities over the control bioreactor. The removal of COD, \({\mathrm{NH}}_{4}^{+}-\mathrm{N}\), and \({\mathrm{PO}}_{4}-\mathrm{P}\) was higher than the control bioreactor by 32.6%, 75.9%, and 77% respectively. The outcomes also demonstrated that a CD of 1 mA/cm2 with an operation mode of 60 s-ON/300 s-OFF was very effective in impurities removal at 20 °C leading to lower energy consumption and treatment costs. Furthermore, it was suggested that the adequate CD application induced microbial biomass responsible for COD and \({\mathrm{NH}}_{4}^{+}\) bio-utilization. Overall, the alternative EK approach presented in this work could improve the degradation rate by electrically stimulated biomass and optimize the performance of existing treatment plants operated at cold temperatures. Finally, this work establishes a viable approach for either retrofitting existing processes or constructing new wastewater facilities.
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Abbreviations
- ATP:
-
Adenosine triphosphate
- CD:
-
Current density
- COD:
-
Chemical oxygen demand
- CFU:
-
Colony forming unit
- DC:
-
Direct current
- DO:
-
Dissolved oxygen
- DNA:
-
Deoxyribonucleic acid
- EK:
-
Electrokinetic
- ET:
-
Electron transfer
- ISA:
-
Ionic strength adjustor
- MEBR:
-
Membrane electro-bioreactor
- MLSS:
-
Mixed liquor suspended solids
- MLVSS:
-
Mixed liquor volatile suspended solids
- NRR:
-
Nitrogen removal rate
- OUR:
-
Oxygen uptake rate
- PCA:
-
Plate count agar
- PEF:
-
Pulsed electric field
- PAOs:
-
Polyphosphate-accumulating organisms
- T:
-
Temperature
- WWTPS :
-
Wastewater treatment plants
- mL:
-
Milliliter
- A/m2 :
-
Ampere/square meter
- mA:
-
Milliampere
- mA/cm2 :
-
Milliampere/square centimeter
- V/cm:
-
Volt/centimeter
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Lagum, A.A. Low-temperature treatment of domestic sewage by electrokinetic-based reactor. Biomass Conv. Bioref. (2023). https://doi.org/10.1007/s13399-023-04034-x
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DOI: https://doi.org/10.1007/s13399-023-04034-x