Activated Carbon Filter Pore Structure for High-SV PFAS Removal
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Solution Overview
Problem
Existing filters using activated carbon are inadequate in removing fluorine-containing organic compounds like PFAS at high superficial velocities, despite having sufficient mesopore volumes.
Innovation Solution
The filter incorporates an activated carbon molded body with specific pore volume distributions, including 0.30 cc/g of pores ≤2.0 nm and 0.01 cc/g of pores in the 3.0 to 3.5 nm range, optimized using the QSDFT method to enhance adsorption efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the pore volume of mesopores is increased to improve PFAS removal capacity, then the adsorption performance is improved, but the filtration speed decreases at high superficial velocities
Solution Approach 1:
The invention changes the pore size distribution parameters by controlling the volume of specific pore diameter ranges (0.65-1.0 nm, 1.0-1.5 nm, 1.5-2.0 nm) during activated carbon production. This parameter optimization allows the filter to achieve both high PFAS removal efficiency and maintain effective filtration speed at high superficial velocities by creating an ideal balance between adsorption capacity and fluid flow characteristics.
2Reliability
If the pore volume of small pores (≤2.0 nm) is increased to enhance PFAS adsorption, then the removal efficiency is improved, but the water flow resistance increases
Solution Approach 1:
The invention applies local quality by creating different pore volume distributions in specific pore diameter ranges within the activated carbon structure. By optimizing the pore volume in each range (0.65-1.0 nm, 1.0-1.5 nm, 1.5-2.0 nm) according to different functional requirements, the filter achieves high PFAS adsorption capacity while maintaining adequate water flow characteristics, thus reducing flow resistance.
Solution Approach 2:
The invention creates a composite pore structure within the activated carbon that combines multiple pore size ranges with optimized volume ratios. This composite pore system integrates the adsorption advantages of small pores with the flow advantages of larger pores, achieving both high removal efficiency and acceptable flow resistance simultaneously.
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 filter maintains high performance in removing PFAS even at high superficial velocities, ensuring effective filtration of fluorine-containing organic compounds.
Implementation Method 1
a technique using a filter containing activated carbon has been proposed
Data Source
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AI summary
The main objective of the present invention is to provide a filter having excellent performance in removing fluorine-containing organic compounds even when the superficial velocity (SV) of water to be treated is high. A filter according to the present invention includes an activated carbon molded body containing activated carbon. Among pore volumes calculated by a QSDFT method, the activated carbon molded body has a pore volume A(cc/g) of at least 0.30 cc/g of pores having a pore diameter of 2.0 nm or less, and has a pore volume B(cc/g) of at least 0.01 cc/g of pores having a pore diameter of 3.0-3.5 nm.