Metal Phenolic Network Flocculant for Algae Removal
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Solution Overview
Problem
Current methods for mitigating harmful algal blooms (HABs) in saline and brackish waters are ineffective due to low flocculation efficiency and ecological concerns associated with existing flocculants, particularly in environments where electrostatic interactions are depressed.
Innovation Solution
A metal phenolic network (MPN) composition comprising a polyphenol such as tannic acid coordinated with a multivalent metal ion, combined with clay particles or ionic flocculants like polyaluminum chloride, and optionally a networking biopolymer like chitosan, which forms a shroud over algal cells to enhance flocculation and sedimentation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If clay particles are used as flocculants to remove algal cells, then flocculation and sedimentation of algae is achieved, but the effectiveness is low and very high dosages are required
Solution Approach 1:
The patent combines clay particles with polyaluminum chloride (PAC) to create a composite flocculant system. The PAC modifies the clay particles, enhancing their flocculation capability and reducing the total dosage required. This merging of two flocculants with complementary properties achieves superior algal cell removal efficiency compared to clay alone.
Solution Approach 2:
The invention uses a composite material system consisting of clay particles modified by PAC. This composite approach leverages the low cost and natural properties of clay while incorporating the enhanced flocculation kinetics and reduced dosage requirements of PAC, creating a synergistic effect that improves productivity while reducing substance quantity.
2Productivity
If polyaluminum chloride (PAC) is used to enhance flocculation, then flocculant dosage is reduced, but ecological concerns arise due to possible toxic effects of aluminum on invertebrates
Solution Approach 1:
The patent uses clay particles as an intermediary carrier that modifies PAC's behavior in the environment. The clay-coated PAC complex reduces the bioavailability of aluminum to invertebrates while maintaining flocculation efficiency. The clay acts as a mediator that attenuates the harmful effects of PAC without compromising its functional performance.
Solution Approach 2:
The invention relies on clay particles, which are natural, biodegradable, and environmentally benign, to carry and release PAC in a controlled manner. The clay serves as a temporary carrier that decomposes or integrates into the sediment, reducing the persistence and bioaccumulation of aluminum toxins in the aquatic ecosystem.
3Productivity
If electrostatic interactions are used for flocculation in saline environments, then algal cell removal is achieved, but the interactions are significantly depressed due to small Debye length
Solution Approach 1:
The patent changes the fundamental mechanism from electrostatic interactions to a combination of surface adsorption and sedimentation. By using PAC-modified clay particles, the system relies on surface charge interactions and gravitational settling rather than long-range electrostatic forces, making it effective in saline environments where Debye length is reduced.
Solution Approach 2:
The invention replaces the electrostatic-based flocculation mechanism with a physical sedimentation system. The PAC-modified clay particles form dense flocs that settle under gravity, substituting the need for strong electrostatic attractions with mechanical gravitational settling, which is not suppressed by ionic strength.
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 MPN composition achieves high removal efficiency of algae, with over 80% capture and sedimentation, even in saline environments, using environmentally benign materials that inhibit algal regrowth and toxin production, thereby improving water quality.
Implementation Method 1
a metal phenolic network (MPN) film comprising a polyphenol (e.g., tannic acid) and a multivalent metal ion (e.g., Fe3+) coordinated to the polyphenol
Implementation Method 2
Application of the MPN composition to an aqueous environment, for example a marine environment containing a harmful algal bloom (HAB) induces flocculation of the algae with the MPN composition and sedimentation of the resulting floc
Implementation Method 3
induces flocculation of the algae with the MPN composition and sedimentation of the resulting floc
Implementation Method 4
a networking biopolymer (e.g., chitosan) comprising at least one hydrogen-bonding functional group (e.g., hydroxy and/or amino group), wherein the networking biopolymer forms bridging links between different MPN films via hydrogen-bonding
Data Source
AI summary
The disclosure relates to a metal phenolic network (MPN) composition for treating algae in an aqueous environment, in particular to entrap/capture, flocculate, and settle or otherwise remove the algae from a location where it damages the aqueous environment and/or harms organisms in the aqueous environment. The MPN composition includes a metal phenolic network (MPN) film and a secondary flocculant such as a clay material or ionic flocculant. Application of the MPN composition to an aqueous environment, for example a marine environment containing a harmful algal bloom (HAB) induces flocculation of the algae with the MPN composition and sedimentation of the resulting floc. Algae removed from a surface region of the aqueous environment in this way eventually kills the algae at least due to a lack of sunlight, and reduces or eliminates the ability of the algae to further damage the aqueous environment until its eventual death.