Cationic Nanofibrillar Cellulose for Water Purification
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Solution Overview
Problem
Current water treatment methods rely heavily on chemicals like polyacrylamides and aluminum sulfates, which are environmentally harmful and economically inefficient, and struggle to effectively remove charged contaminants such as metal ions and oxyanions due to charge repulsion and small particle sizes.
Innovation Solution
The use of plant-derived cationic nanofibrillar cellulose, which can bind a net charge higher than its own, forms complexes with anionic and cationic components, allowing for the removal of both negatively and positively charged contaminants through chemical and mechanical means, reducing the need for excessive chemicals and enabling efficient filtration or centrifugation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional chemicals like polyacrylamides and aluminum sulfates are used for water treatment, then contaminant removal is achieved, but environmental harm increases and economic efficiency decreases
Solution Approach 1:
The patent uses nanofibrillar cellulose derived from renewable plant materials as a biodegradable, environmentally friendly alternative to persistent synthetic chemicals. The nanocellulose can be disposed of safely without causing long-term environmental harm, while maintaining effective contaminant removal capabilities
Solution Approach 2:
The patent modifies the surface charge properties of nanocellulose through chemical treatment to create cationic nanofibrillar cellulose. This parameter change enables the material to effectively attract and remove anionic contaminants through electrostatic attraction, while the natural biodegradability prevents environmental accumulation
2Reliability
If conventional chemicals are used for water treatment, then some contaminant removal is achieved, but economic efficiency worsens
Solution Approach 1:
Nanofibrillar cellulose is derived from abundant, renewable plant materials and can be produced at lower cost compared to synthetic polymers. The material's effectiveness combined with its low cost and biodegradability improves overall economic efficiency of water treatment operations
Solution Approach 2:
The cationic nanofibrillar cellulose can remove multiple types of contaminants including metal ions, oxyanions, and other anionic species through a single mechanism, eliminating the need for multiple different chemical treatments and reducing overall operational costs
3Ease of operation
If filtration or sedimentation is used alone, then simple separation is achieved, but removal of charged contaminants is ineffective due to charge repulsion
Solution Approach 1:
The cationic nanofibrillar cellulose acts as an intermediary between the charged contaminants and the filtration/sedimentation process. The positively charged nanocellulose attracts negatively charged contaminants through electrostatic attraction, forming larger complexes that can then be easily removed by simple filtration or sedimentation
Solution Approach 2:
The invention creates composite structures where nanocellulose fibers bind with contaminant ions to form larger aggregated complexes. These composite structures combine the electrostatic attraction capability of charged nanocellulose with the mechanical separation capability of filtration, achieving both effectiveness and simplicity
4Quantity of substance
If small contaminant species are present in water, then water appears clean, but removal becomes difficult due to small particle size
Solution Approach 1:
The cationic nanofibrillar cellulose merges with small contaminant species through electrostatic attraction and adsorption, forming larger aggregated flocs. This combining process increases the effective particle size from nanometer scale to micrometer or millimeter scale, making the contaminants removable by conventional filtration and sedimentation methods
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 provides a cost-effective, energy-saving, and environmentally friendly method for water purification, capable of removing a wide range of contaminants, including metal ions and oxyanions, with high purification efficiency and the potential for metal recovery and safe disposal of the nanofibrillar cellulose.
Implementation Method 1
plant-derived cationic nanofibrillar cellulose, which can bind a net charge higher than its own, forms complexes with anionic and cationic components
Implementation Method 2
The adsorption capacity of oxidized cellulose nanofibers for metal ions, including copper(II), nickel(II), chromium(III) and zinc(II) was studied
Implementation Method 3
The flocculated material is then sedimented and the rest of the water is directed to filtration and disinfection processes
Implementation Method 4
enabling efficient filtration or centrifugation
Data Source
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Figure 3
AI summary
The present invention concerns a process for removing ions from waste water, which process comprises providing plant-derived cationic nanofibrillar cellulose, carrying out a purification treatment comprising sorption of ions contained in the waste water to the plant-derived cationic nanofibrillar cellulose, separating used plant-derived cationic nanofibrillar cellulose from the waste water, and recovering treated waste water. The invention also concerns use of plant-derived cationic nanofibrillar cellulose in water treatment for removing charged contaminants.