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An integrated electrochemical-coupled membrane reactor system was constructed, where a conductive ceramic membrane (CCM) cathode fabricated by spray pyrolysis-in situ precipitation and a Ti/RuO2-IrO2 anode were employed to investigate the mitigation mechanism of membrane fouling during electric field-assisted oil-containing wastewater treatment. It was demonstrated that a stable Sb-SnO2 conductive coating was successfully deposited on the CCM electrode surface through the spray pyrolysis-in-situ precipitation method, exhibiting an average roughness of approximately 324nm, which represented a 32% reduction compared to the pre-modified state. Under an electrochemical potential of -1.0V, the CCM electrode was characterized by an impedance value of 38 Ω·cm2 and a corrosion potential of -0.36V, indicating excellent electrode stability and corrosion resistance. In oily wastewater treatment experiments, when the applied electric field intensity was varied between 0.6~9.8V/cm, the flux decline rate of the CCM membrane was observed to progressively decrease with increasing electric field intensity. The flux decay rate was found to stabilize when the electric field intensity reached 4.2V/cm. After five cycles of hydraulic backwashing, the CCM membrane flux was measured to be 15%~17% higher for both 0.1g/L and 0.5g/L oily wastewater concentrations compared to non-electrified conditions, demonstrating extended membrane service life. Membrane fouling characterization revealed that the modified CCM exhibited enhanced hydrophilicity and surface electronegativity, which generated strong repulsive forces against oil droplets (Zeta potential: -35.2 to~16.7mV) during electric field-assisted separation. Analysis of the membrane fouling mechanism indicated that the electric field application significantly improved the irreversibility of membrane fouling, with the fouling process being transformed from a standard clogging model to a complete clogging model. These findings further confirmed the critical role of electric fields in mitigating membrane fouling progression.
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| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
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