Optimizing Microbial Electrochemical Systems (MES) for Sustainable Wastewater Treatment and Energy Recovery Using Novel Electrode Materials and Real-Time Process Control

Project Abstract

This study presents a comprehensive investigation into the optimization of microbial electrochemical systems (MES) for simultaneous wastewater remediation and energy recovery, leveraging novel electrode materials and real-time process control to enhance performance, durability, and economic viability. The research integrates material science, electrochemical engineering, and systems biology to address key bottlenecks in MES efficiency, including electron transfer kinetics, biofilm–electrode interfacing, and cathodic catalyst activity. We synthesized and characterized a suite of advanced electrode materials, including three-dimensional porous anodes with tailored biocompatible surfaces and composite cathodes incorporating transition metal oxides and conductive polymers, designed to maximize biocathodic and anodic charge transfer, reduce internal resistance, and mitigate fouling. Advanced fabrication methods, such as 3D printing and electrospinning, enabled precise control over pore architecture, surface area, and mechanical stability under operational wastewater conditions. Experiments were conducted in lab-scale MES reactors fed with real municipal and industrial wastewater matrices to evaluate pollutant removal efficiency, current density, coulombic efficiency, and energy recovery potential. Real-time process monitoring employed multi-parameter sensing (redox potential, pH, dissolved oxygen, temperature, conductivity) integrated with advanced control algorithms, including model predictive control and adaptive PID strategies, to dynamically adjust operational parameters (external resistance, organic loading rate, hydraulic retention time) in response to feed variability and biofilm maturation. A data-driven framework, incorporating machine learning for pattern recognition and anomaly detection, was developed to predict system performance and preempt fouling or electrode degradation. Key findings demonstrate that the optimized MES achieved higher chemical oxygen demand (COD) removal rates and improved energy recovery, with superior power density and coulombic efficiency relative to conventional configurations. The novel electrode materials exhibited enhanced biofilm adherence, reduced overpotential losses, and improved durability under fluctuating wastewater quality. Real-time control reduced process variability, stabilized performance across cycles, and extended operational lifespan by mitigating biofouling and electrode corrosion. Life cycle assessment and techno-economic analysis indicate favorable environmental and economic impacts, with potential for cost-competitive operation in decentralized wastewater treatment settings. The work advances understanding of microbial–electrode interactions, reveals critical design parameters for electrode geometry and surface chemistry, and demonstrates the value of integrated sensing and control in MES operation. The research provides a scalable blueprint for deploying MES with optimized electrodes and intelligent process management, enabling significant reductions in energy consumption, greenhouse gas emissions, and treatment costs while achieving robust pollutant removal and resource recovery. Future work will explore long-term field validation, pilot-scale integration with existing treatment infrastructure, and expansion of the electrode library to address diverse wastewater streams.

Project Overview

What This Project Is About

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A final-year project that explores how to treat wastewater while producing useful energy. It looks at a technology called a microbial electrochemical system (MES), where microbes help convert waste into electricity or other fuels using special electrodes. The project also tests new electrode materials and ways to monitor and adjust the process in real time to keep it efficient.

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The Problem It Addresses

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Wastewater contains pollutants that must be cleaned before it can be released or reused. Traditional methods can be energy-intensive. MES offers a way to remove pollutants while generating energy, but effectiveness depends on materials and control methods. The project tackles gaps in electrode choices and how to manage the system actively to maximize both cleanup and energy recovery.

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Objectives of the Project

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1. Assess different electrode materials for performance and durability in MES.
2. Explore how real-time monitoring can improve process control.
3. Measure pollutant removal efficiency and energy recovery under varied conditions.
4. Develop practical guidelines for selecting materials and control strategies.

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What You Will Do Step by Step

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1. Review basic MES concepts and safety considerations.
2. Set up a small MES experiment with interchangeable electrodes.
3. Run tests to compare material performance and monitor voltage, current, and pollutant levels in real time.
4. Analyze data to relate material choice and control approach to efficiency and energy yield.
5. Summarize findings and suggest recommendations for future work.

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Expected Outcome

Expected outcomes include a clear comparison of electrode materials, a simple real-time control approach, and practical guidance for implementing MES in wastewater treatment with energy recovery benefits.