Electrochemical treatment of landfill leachate using different electrodes
At a Glance
Section titled “At a Glance”| Metadata | Details |
|---|---|
| Publication Date | 2021-11-29 |
| Journal | Research Society and Development |
| Authors | João Paulo Moreira Santos, Luiz Carlos Peppino Neto, Mateus Silveira Freitas, Geoffroy Roger Pointer Malpass, Deusmaque Carneiro Ferreira |
| Institutions | Instituto Federal de Educação, Ciência e Tecnologia do Triângulo Mineiro, Universidade Federal do Triângulo Mineiro |
| Analysis | Full AI Review Included |
Technical Analysis and Documentation: MPCVD Diamond for Advanced Electrochemical Oxidation
Section titled “Technical Analysis and Documentation: MPCVD Diamond for Advanced Electrochemical Oxidation”Executive Summary
Section titled “Executive Summary”This documentation analyzes the comparative study on electrochemical treatment of landfill leachate, highlighting the superior performance of Boron Doped Diamond (BDD) electrodes over Dimensionally Stable Anodes (DSA).
- Superior Performance: BDD electrodes achieved a Total Organic Carbon (TOC) removal efficiency of 77.73%, significantly outperforming the 15.40% removal achieved by the DSA (Ti/Ru0.3Ti0.7O2) under optimized conditions.
- High Degradation Capacity: The BDD anode demonstrated robust oxidative power, resulting in approximately 40% UV-Vis discoloration of the highly complex and toxic leachate effluent.
- Optimized Parameters: Optimal performance for BDD was achieved at a moderate current density of 82 mA/cm² and an electrolysis time of 18.5 minutes, confirming BDD’s efficiency in galvanostatic mode.
- Material Validation: The research validates MPCVD BDD as the preferred “non-active” anode material for Advanced Electrochemical Oxidation (AEO) processes, due to its high potential for generating powerful hydroxyl radicals (•OH).
- Scalability Potential: The successful lab-scale results using commercial BDD (8000 ppm B/C) provide a strong foundation for scaling up environmental remediation systems using 6CCVD’s custom, large-area BDD plates.
Technical Specifications
Section titled “Technical Specifications”Data extracted from the comparative study on electrochemical leachate treatment using BDD and DSA electrodes.
| Parameter | Value | Unit | Context |
|---|---|---|---|
| BDD Optimal TOC Removal | 77.73 | % | Experiment 4 result |
| DSA Optimal TOC Removal | 15.40 | % | Experiment 9 result |
| BDD Optimal Current Density (X1) | 82 | mA/cm² | Optimized critical point |
| BDD Optimal Electrolysis Time (X2) | 18.5 | minutes | Optimized critical point |
| BDD Optimal Electrolyte Conc. (X3) | 0.19 | mol L⁻¹ | NaCl electrolyte concentration |
| BDD Discoloration Efficiency | ~40 | % | Measured via UV-Vis spectroscopy |
| BDD Doping Level Used | 8000 | ppm B/C | Commercial BDD specification |
| BDD Geometric Area Used | 2 | cm² | Lab-scale anode dimension |
| DSA Material Composition | Ti/Ru0.3Ti0.7O2 | N/A | Dimensionally Stable Anode |
| Initial Leachate TOC | 427 | ppm | Untreated sample standard |
| Initial Leachate pH | 7.8 | N/A | Untreated sample standard |
Key Methodologies
Section titled “Key Methodologies”The following steps outline the critical experimental procedures used to compare BDD and DSA performance in the electrochemical oxidation of leachate:
- Electrode Selection: Two anode types were tested: Commercial Boron Doped Diamond (BDD) (8000 ppm B/C, 2 cm²) and a Dimensionally Stable Anode (DSA) (Ti/Ru0.3Ti0.7O2, 1.68 cm²).
- Cell Setup: Batch electrochemical tests were conducted in a single-compartment cell with a total capacity of 100 mL (20 mL leachate and 80 mL deionized water).
- Auxiliary Electrode: A Platinum (Pt) wire spiral was utilized as the counter electrode in all electrolysis experiments.
- Process Control: Electrolyses were performed in galvanostatic mode, applying varying current densities using an Autolab PGSTAT 30 potentiostat/galvanostat.
- Experimental Design: A Central Composite Rotated Design (DCCR) was implemented to statistically optimize three independent variables: current density, electrolysis time, and electrolyte concentration (NaCl).
- Analytical Monitoring: Total Organic Carbon (TOC) removal was measured using a Shimadzu-4200 analyzer. Discoloration was tracked using a Perkin Elmer spectrophotometer.
6CCVD Solutions & Capabilities
Section titled “6CCVD Solutions & Capabilities”The research confirms that BDD is the optimal material for high-efficiency electrochemical wastewater treatment. 6CCVD is uniquely positioned to supply the necessary high-quality, customizable BDD materials and engineering support required to replicate, optimize, and scale this technology.
| Applicable Materials & Requirements | 6CCVD Solution & Customization Potential |
|---|---|
| High-Purity BDD Anodes | Heavy Boron-Doped PCD/SCD: We provide MPCVD BDD with precise, tunable doping levels (e.g., 8000 ppm B/C used in the study) to maximize the generation of hydroxyl radicals (•OH) and ensure long-term stability under high current densities (82 mA/cm²). |
| Scalability & Large Area Electrodes | The study used a small 2 cm² electrode. 6CCVD offers Polycrystalline Diamond (PCD) plates/wafers up to 125mm in diameter, enabling direct scale-up for industrial leachate treatment systems. |
| Custom Thickness & Lifetime | We manufacture BDD films in thicknesses ranging from 0.1 µm to 500 µm. This allows engineers to specify the optimal thickness for balancing electrode lifetime, cost, and mechanical robustness in continuous flow reactors. |
| Integrated Electrode Assemblies | The experiment required a Platinum (Pt) counter electrode. 6CCVD provides comprehensive custom metalization services (including Au, Pt, Pd, Ti, W, Cu) for creating specialized contacts, integrated counter electrodes, or complex electrode geometries. |
| Surface Quality for Performance | For applications requiring minimal fouling and consistent performance, 6CCVD offers advanced polishing services, achieving surface roughness (Ra) < 5 nm on inch-size PCD, ensuring reliable electrochemical kinetics. |
| Engineering Support for AEO | 6CCVD’s in-house PhD team specializes in material science for electrochemical applications. We provide expert consultation on material selection, doping optimization, and design parameters for similar Advanced Electrochemical Oxidation (AEO) projects. |
| Global Logistics | We ensure reliable, global delivery of sensitive diamond materials, offering DDU (default) and DDP shipping options to meet international research and development timelines. |
For custom specifications or material consultation, visit 6ccvd.com or contact our engineering team directly.
View Original Abstract
This article has as its objective a comparative study of the electrochemical treatment of slurry generated in landfills carried out with Dimensionally Stable Anodes (DSA) (Ti/Ru0.3Ti0.7O2) and Boron Doped Diamond (BDD). From the capacity planning and control (PCC), the central composite rotated design (DCCR) was obtained, whose independent variables in the electrolysis process were current density, time and electrolyte concentration. The removal of Total Organic Carbon (dependent variable) was 15.40% with current density 158 mA cm-², electrolysis time 15 minutes and 0.2 mol L-1 of the NaCl electrolyte using DSA. With the BDD, at the optimum point at 82 mA cm-², 18.5 minutes and 0.19 mol L-1, 77% removal of the organic load and discoloration of approximately 40% Ultraviolet-Visible.