Electrocoagulation Brine Treatment for CO2 Capture and Solid Recovery
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Solution Overview
Problem
The disposal of brine solution after desalination poses environmental challenges due to its high salinity and harmful contaminants, while CO2 emissions require efficient capture and utilization, and existing methods for both are costly or environmentally damaging.
Innovation Solution
An electrocoagulation reactor that integrates CO2 capture and brine desalination by applying an electric current to brine solution with electrodes, forming solid carbonates and coagulants, using calcium oxide and ammonium bicarbonate to enhance reactions, and controlling temperature and gas mixture for efficient precipitation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If conventional brine management methods (deep well injection, evaporation ponds) are used, then brine disposal is achieved, but high costs, energy consumption, and environmental damage occur
Solution Approach 1:
The patent converts harmful brine waste into valuable solid carbonate products by reacting CO2 with metal hydroxides generated during electrocoagulation. This transforms the disposal problem into a resource recovery opportunity, eliminating the need for energy-intensive evaporation ponds or deep well injection while producing marketable materials.
Solution Approach 2:
The system uses the brine itself as the source of metal ions that react with CO2 to form carbonates. The brine contaminants (metal ions) that need to be removed are directly utilized to capture CO2 and form solid products, making the waste material serve the capture function.
2Productivity
If electrocoagulation is used for brine treatment and CO2 capture, then salinity reduction and CO2 sequestration are achieved, but electrode corrosion and scaling occur
Solution Approach 1:
The patent converts the harmful effect of electrode corrosion into a beneficial process by utilizing the dissolved metal ions from corroded electrodes to react with CO2 and form solid carbonate precipitates. The corrosion products that would normally be waste are instead the raw materials for CO2 capture and valuable solid product formation.
Solution Approach 2:
The system recovers valuable metal carbonates from the electrode corrosion products. Instead of discarding the corroded electrode material as waste, the metal ions are captured and converted into solid carbonate products that can be recovered and potentially sold, turning a maintenance problem into a resource generation opportunity.
3Adaptability or versatility
If CO2 is reacted with brine to extract salts, then CO2 utilization and brine management are improved, but process efficiency and scalability remain challenging
Solution Approach 1:
The patent merges CO2 capture with brine treatment and desalination into a single integrated electrocoagulation process. The electrocoagulation step generates metal hydroxides in situ that immediately react with CO2 to form carbonates, combining multiple functions (desalination, CO2 capture, solid recovery) into one operation, thereby improving overall process efficiency and scalability.
Solution Approach 2:
The system maintains continuous CO2 capture throughout the electrocoagulation process by constantly generating metal hydroxides that react with CO2. The process operates continuously with CO2 bubbling through the brine solution during electrode operation, ensuring uninterrupted CO2 utilization and brine treatment without requiring separate batch processing steps.
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
The reactor effectively reduces brine salinity, captures CO2 as stable carbonates, and recovers valuable salts, providing a sustainable and cost-effective solution for high-salinity brine treatment.
Implementation Method 1
Electrocoagulation (EC) is emerging as a promising technology to tackle these problems. EC operates by applying an electric current to water, causing the dissolution of metal electrodes (usually aluminum or iron) to release ions that adsorb onto contaminants, facilitating their removal.
Implementation Method 2
EC has shown potential for capturing CO2. The process generates metal hydroxides that react with CO2 to form stable carbonates like calcium carbonate (CaCO3). This not only separates CO2 but also improves water quality by reducing its acidity and promoting further CO2 absorption.
Implementation Method 3
an inlet tube positioned in the reaction chamber, the inlet tube being configured to supply carbon dioxide (CO2) gas into the brine solution contained in the reaction chamber
Implementation Method 4
the at least one first electrode and at least one second electrode being connectable to a power source for delivering a voltage across the at least one first electrode and at least one second electrode to facilitate electrochemical reactions and electrocoagulation
Data Source
AI summary
An electrocoagulation (EC) reactor and method for simultaneous CO2 capture and brine desalination. The EC reactor includes a reaction chamber that holds brine solution with contaminants, an inlet tube for CO2 gas mixture supply, and a plurality of electrodes (130), submerged in the brine. The electrodes are connected to a power source, applying a voltage to induce electrochemical reactions that precipitate dissolved salts and heavy metals, reducing brine salinity and contaminants, while capturing CO2 in the form of carbonates to form solid coagulants. The method involves introducing brine into the EC reactor's reaction chamber, adding calcium oxide (CaO) and ammonium bicarbonate (NH4HCO3) to create a homogeneous solution, and applying electric current to dissolve the electrodes, producing solid coagulants. A CO2 gas mixture is introduced to facilitate carbonation reactions, forming precipitates like calcium carbonate (CaCO3) and magnesium carbonate (MgCO3), which are filtered to obtain desalinated brine.