Solid Polymer Electrolyte Cell for Wastewater Treatment
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Solution Overview
Problem
Current electrochemical wastewater treatment methods face inefficiencies due to high energy consumption, requirement of supporting electrolytes, and production of secondary pollution, especially in single chamber systems with solid polymer membrane electrolyte cells, which hinder effective removal of organic pollutants and oxidation of inorganic compounds.
Innovation Solution
The implementation of a solid polymer electrolyte electrolytic cell system with a liquid-electrolyte free cathode, operating at lower current densities and voltages, and utilizing a combination of voltage and current density limitations, along with optimized catalyst layers and flow rates, to enhance energy efficiency and pollutant removal without added supporting electrolytes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If supporting electrolyte is added to improve ionic conductivity, then cell efficiency is improved, but salt and base concentrations exceed discharge limits causing secondary pollution
Solution Approach 1:
The patent removes the supporting electrolyte from the system by using a solid polymer membrane electrolyte that provides ionic conductivity through its intrinsic structure rather than through dissolved salts. This extraction of the harmful supporting electrolyte eliminates secondary pollution while maintaining cell efficiency through the membrane's proton-conducting properties.
Solution Approach 2:
The patent changes the physical state of the electrolyte from liquid (supporting electrolyte solution) to solid (polymer membrane). This parameter change from liquid to solid electrolyte fundamentally alters the system's behavior, providing ionic conductivity through the membrane matrix without introducing salt concentrations that would exceed discharge limits.
2Productivity
If high current density is used to increase treatment productivity, then energy consumption increases and incomplete destruction of organic contaminants occurs
Solution Approach 1:
The patent changes the operating parameters to use lower current densities combined with optimized voltage levels. This parameter optimization allows sufficient treatment productivity while avoiding the energy waste and incomplete destruction associated with high current density operation. The solid polymer membrane enables efficient operation at these optimized lower parameters.
Solution Approach 2:
The patent applies partial action by using lower current densities than conventional high-rate electrochemical treatment, but compensates with optimized voltage application and extended residence time in the electrochemical cell. This partial approach with optimization achieves comparable productivity without the excessive energy consumption and incomplete treatment of high current density methods.
3Reliability
If large electrode gaps are used to reduce resistance, then cell voltage increases leading to higher energy consumption
Solution Approach 1:
The patent changes the electrolyte from liquid to solid polymer membrane form, which fundamentally alters the resistance characteristics. The solid membrane provides consistent ionic conductivity through its structured matrix, enabling lower operating voltages and reduced energy consumption compared to liquid electrolyte systems with large electrode gaps.
4Reliability
If conventional electrochemical oxidation is used to remove organic pollutants, then treatment efficacy is improved, but chemicals must be added producing secondary pollution
Solution Approach 1:
The patent extracts and removes the need for chemical additives by using direct electrochemical oxidation at the electrode surfaces. The solid polymer membrane enables this direct oxidation process without requiring supporting electrolytes or other chemical reagents, thereby eliminating secondary pollution while maintaining high treatment efficacy for organic pollutants.
Solution Approach 2:
The system uses self-service electrochemical oxidation where the electric current directly drives the oxidation of organic pollutants at the anode surface without requiring external chemical oxidants. The solid polymer membrane facilitates this self-sufficient process by providing the necessary ionic conductivity for the electrochemical reactions to proceed efficiently.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach achieves improved energy efficiency and complete pollutant removal with reduced energy consumption and no secondary pollution, allowing for the treatment of a wide range of pollutants, including organic and inorganic compounds, while minimizing operational costs and environmental impact.
Implementation Method 1
a solid polymer membrane electrolyte separating the anode and the cathode
Implementation Method 2
electrochemical cell comprising an anode, a cathode, and a solid polymer membrane electrolyte
Implementation Method 3
The second approach is to use direct electrochemical oxidation, where the organic pollutants are oxidized on the anode surface
Implementation Method 4
The anode comprises an anode catalyst layer, and the anode catalyst layer comprises an anode catalyst
Implementation Method 5
hydrogen gas being generated at the cathode
Implementation Method 6
the cathode comprises a cathode catalyst layer and the cathode catalyst layer comprises a cathode catalyst
Data Source
AI summary
An efficient method and system for the electrochemical treatment of waste water comprising organic and/or inorganic pollutants is disclosed. The system comprises at least first and second solid polymer electrolyte electrolytic cell stacks in which each cell comprises a solid polymer, proton exchange membrane electrolyte operating without catholyte or other supporting electrolyte. The first and second stacks differ either in construction or operating condition. The cell stack design and operating conditions chosen provide for significantly greater operating efficiency.