Solid Polymer Electrolyte Cell with Filter Layer for Wastewater
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Solution Overview
Problem
Current wastewater treatment technologies using electrolytic cells face inefficiencies due to high energy consumption, requirement for supporting electrolytes, and operational challenges such as poor ionic conductivity and electrode passivation, leading to incomplete pollutant destruction and increased costs.
Innovation Solution
A solid polymer electrolyte electrolytic cell design with a liquid-electrolyte free cathode, incorporating a filter layer to remove particulates and suspended solids, and operating at reduced voltage and current density to enhance energy efficiency and minimize side reactions.
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/acid concentrations exceed discharge limits adding to disposal costs and balance of plant costs
Solution Approach 1:
The patent removes the supporting electrolyte from the system entirely, replacing it with a solid polymer electrolyte membrane that provides ionic conductivity without introducing additional salts or base/acid concentrations into the wastewater stream, thereby eliminating the harmful discharge byproducts while maintaining cell efficiency
Solution Approach 2:
The solid polymer electrolyte membrane acts as an intermediary substance that provides the necessary ionic conductivity between electrodes without requiring traditional liquid supporting electrolytes, serving as a mediator that enables efficient ion transport while avoiding the harmful concentration buildup associated with conventional electrolyte addition
2Productivity
If high current density is used to increase treatment rate, then productivity is improved, but energy consumption increases and incomplete destruction of organic contaminants occurs
Solution Approach 1:
The patent optimizes operating parameters by using controlled current densities (0.1-10 A/dm²) and voltages (1-5 V) that balance treatment effectiveness with energy efficiency, achieving complete contaminant destruction without excessive energy consumption through careful parameter selection and control
3Ease of operation
If large electrode gaps are used to facilitate mass transport, then ease of operation is improved, but efficiency losses and increased energy consumption occur
Solution Approach 1:
The patent employs porous electrodes with optimized pore structures that facilitate mass transport of contaminants to electrode surfaces while maintaining compact electrode gaps, achieving efficient ion and molecule transport without requiring large spacing that would cause energy losses
4Ease of operation
If catalyst materials with low over potentials are used to reduce side reactions, then ease of operation is improved, but catalysts with low over potentials for side reactions (e.g. oxygen evolution) still contribute to efficiency losses
Solution Approach 1:
The patent uses catalyst materials with selectively optimized properties that provide low over potentials for desired oxidation reactions while having high over potentials for side reactions like oxygen evolution, creating local quality differences in catalyst performance to favor target reactions and minimize energy-wasting side reactions
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 configuration achieves improved energy efficiency and complete pollutant degradation without the need for supporting electrolytes, reducing energy consumption and operational costs while maintaining effective pollutant removal.
Implementation Method 1
a solid polymer membrane electrolyte separating the anode and the cathode
Implementation Method 2
The second approach is to use direct electrochemical oxidation, where the organic pollutants are oxidized on the anode surface
Implementation Method 3
hydrogen gas being generated at the cathode
Implementation Method 4
incorporating a filter layer to remove particulates and suspended solids
Data Source
AI summary
An electrolytic cell, system, and method for the energy efficient electrochemical treatment of wastewater comprising organic and/or inorganic pollutants are disclosed. The system comprises an electrolytic cell comprising a solid polymer, proton exchange membrane electrolyte operating without catholyte or other supporting electrolyte. The electrolytic cell also comprises a filter layer incorporated between the anode fluid delivery layer and the anode flow field plate for removing various contaminants including particulates and/or suspended solids from the wastewater stream. The cell design and operating conditions chosen provide for significantly greater operating efficiency.