AI Article Synopsis
- The study explored how the anodic metabolic rate affects the desalination performance of microbial desalination cells (MDCs) in both open and closed circuit operations.
- Three MDCs were tested with different organic substrate loads, revealing that higher substrate loads led to better desalination and removal rates, particularly in closed circuit mode.
- MDC-C performed the best overall in desalination and chemical oxygen demand (COD) removal, showcasing that increasing organic load enhances efficiency through better electrochemical performance.
Article Abstract
Anodic metabolic rate showed regulatory influence on the desalination performance of microbial desalination cell (MDC) under open (OC) and closed circuit (CC) operations. In this study, three MDCs were tested for desalination with three different organic substrate loads 1500 ± 55 mg/L in MDC-A; 3500 ± 10 g/L in MDC-B; 4500 ± 12 g/L in MDC-C. Higher desalination and substrate removal rates were observed in CC than OC. Average desalination was MDC-C (51.4%-CC) > MDC-B (47.3%-CC) > MDC-A (45.3%-CC) and COD removal efficiencies were MDC-C (68.4%-CC) > MDC-B (64.4%-CC) > MDC-A (51.9%-CC). Increase in organic load resulted in higher desalination efficiency which was due to higher electrochemical and ionic gradient apart from anodic metabolic activity. The voltage and current density were observed to be maximum in MDC-C (685 mV; 2.16 mA/m) followed by MDC-B (598 mV; 1.98 mA/m) and MDC-A (501 mV; 1.76 mA/m). This study demonstrated that the MDCs performance can be regulated by varying organic load and circuitry modes.
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| http://dx.doi.org/10.1016/j.biortech.2020.123334 | DOI Listing |
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