陶瓷膜MBR耦合生物电化学过程的原位膜污染控制系统与机制研究

膜污染是限制膜生物反应器（MBR）效能与应用的主要原因，研究表明外加弱电场或生物电化学MBR可一定程度地缓解膜污染。然而，由于在主要膜污染物质、膜污染行为与控制机制等方面未得到共识，目前仍较难实现膜污染的根本性控制。本申请利用咪唑类离子液体聚合物对表面亲水与形貌可控的陶瓷膜进行导电改性与布局优化，将其作为阴极耦合生物电化学过程，构建稳定高效产电与产H2O2的E-CMBR系统。利用显微粒子测速技术解析外加弱电场对絮体颗粒在膜表面沉积的影响机制。识别E-CMBR中的主要膜污染物质，利用阴极产H2O2对其靶向破坏或去除，结合内生电场降低絮体颗粒沉积效应，实现动态条件下膜污染的根本性控制与系统在低外压驱动下的稳定高通量运行。探索共存难降解物质在膜表面富集与被H2O2强化去除行为，评价系统的稳定性与综合效能。课题的开展可望深入认知陶瓷膜分离行为，突破其在污水处理、能源回收与利用中的技术瓶颈。

Membrane fouling is the main obstacle for membrane bioreactor (MBR) effectiveness and widespread application. Recent reports had revealed that applied electric field or bio-electrochemical MBR could mitigate membrane fouling in a certain level. However, owing to the lack of scientific consensus on major foulants identification, membrane fouling behavior and control mechanisms, it is difficult to eventually control fouling occurrence in an MBR. Based on ceramic membrane own merits, including intrinsic hydrophilic and high modifiable surface morphological properties, which could be modified into high conductivity and selectivity by using ionic liquid polymerization and solidification, and surface morphological optimization, an electrochemical ceramic membrane bioreactor (E-CMBR) with stably effective electricity and hydrogen peroxide generation could be developed. Micro-particle image velocimetry (micro-PIV) will be employed to help visualize and investigate the impact of applied electrical field to the deposition possibility of sludge flocs particles onto membrane surface. The major foulant in E-CMBR retained by ceramic membrane will be identified, which would not be formed without continuous sludge particles deposition on the membrane surface, or be destructed or eliminated by generated hydrogen peroxide in E-CMBR cathode. Therefore, its membrane fouling will be eventually minimized or controlled, and then a high membrane flux driven by a relative low-pressure will be stably obtained in the system. Afterwards, several typical persistent organic pollutants are expected to be accumulated on membrane surface and then enhanced decomposed by generated hydrogen peroxide in E-CMBR. Accordingly, the cost-energy-effectiveness and stability of the established E-CMBR system will also be evaluated. The obtained results in this project will be very useful to understand ceramic membrane-based system and its filtration mechanisms, and is also important to break the bottleneck during its application in wastewater treatment, energy recovery and utilization.