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- Title
Performance analysis of pulsed direct current electrocoagulation for chemical oxygen demand removal from wastewater: energy savings and cost minimization.
- Authors
Karthikeyana, K.; Mothilal, T.; Devi, V. Vandhana
- Abstract
This study primarily focusses on an electrocoagulation module designed for wastewater treatment, which operates on pulsed direct current (PDC) as a power source, thereby ensuring a reliable and efficacious treatment solution. The system's overall specific energy consumption (SEC) underwent a notable reduction while concurrently maintaining its efficacy in reducing chemical oxygen demand (COD). This improvement in reducing COD and the notable reduction in the system's SEC can be attributed to the development of advanced control algorithms for PDC. To facilitate the operation of the PDC system, a buck converter is employed and the optimization of power to electrocoagulation is achieved using an improved proportional - integral control of pulse width modulation (PWM) pulses. Furthermore, it was observed that compared to conventional controlled rectifier-based DC (CR-DC) powered electrocoagulation units, the PWM - controlled buck converter achieved a substantial 48.5% reduction in specific energy consumption at its maximum voltage of 275 V over CR-DC. The performance characteristics of the uncertainty behavior of the developed system were assessed through a combination of simulation and experimental methodologies, confirming its suitability across a wide spectrum of operating voltages. The specific energy consumption for COD removal was determined to be 11.99 and 5.81 kWh/m³ for CR-DC and PDC, respectively, over a 60-min timespan. Additionally, it was established that the PDC module represents a cost-effective alternative, being 48.5% less expensive than CR-DC. The findings from the study prove that the PDC module has commendable efficiency in conserving energy and its economic viability in the electrocoagulation process.
- Subjects
CHEMICAL oxygen demand; ENERGY consumption; ENERGY industries; PULSE width modulation; DC-to-DC converters; SUSTAINABILITY; ENERGY conservation
- Publication
Desalination & Water Treatment, 2023, Vol 316, p214
- ISSN
1944-3994
- Publication type
Article
- DOI
10.5004/dwt.2023.30188