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| Modeling, optimization, and control of biofilter microbial electrolysis cells |
| HAN Xu-wei, WANG Li, WANG Jin |
| School of Energy Science and Engineering, Harbin Institute of Technology, Harbin 150001, China |
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Abstract A physical model and mathematical model of the biofilter microbial electrolysis cell (BF-MEC) system were established to study the system structure, reaction mechanism,and influencing factors, and describe the bioelectrochemical consumption substrate process of the BF-MEC system. The model parameters were estimated according to the experimental results obtained in the continuous flow biofilter. Using CH3COO-, NH4+, and NO3- to simulate wastewater, we explored the effects of the system's optimal electrode spacing, electrode position, applied voltage, hydraulic retention time (HRT), and microbial attachment amount on the system efficiency, and optimized and controlled the system. The simulation results showed that the optimal electrode structure of the BF-MEC system was an electrode spacing of 100mm and the cathode was 150mm from the outlet of the experimental column. When the hydraulic retention time of sewage in the system was greater than 72h, the effluent pollutants could meet the national reclaimed water reuse standard. When the reclaimed water quality was Class B of level one, the minimum voltage required to completely remove pollutant ions was 0.55V. When the microbial attachment amount was greater than 50%, the removal rate increased with the increase of the attachment amount. When the attachment amount reached 93.75%, a small voltage of 0.25V could make the removal rate of each ion in sewage greater than 99%.
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Received: 19 April 2024
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