Acoustic Resonator for Microalgae Separation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional methods for concentrating microalgae from dilute algal water are costly, energy-inefficient, and prone to issues like filter fouling and bacterial contamination, making them unsuitable for large-scale algal biocrude production.
Innovation Solution
An acoustic resonator device with a fluid chamber and a transducer that emits ultrasound waves based on eigenfrequencies, optimizing the excitation of fluids to enhance the separation and mixing of phase-separate materials, such as microalgae, without the need for chemical additives.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional methods (cross-flow membrane filtration, gravity sedimentation, centrifugation) are used to concentrate microalgae, then separation can be achieved, but operational costs are prohibitively high and energy consumption exceeds available energy from microalgae
Solution Approach 1:
The patent applies ultrasonic vibration to the fluid containing microalgae, causing resonant oscillation at eigenfrequencies. This mechanical vibration creates acoustic radiation pressure that drives phase-separate materials (microalgae) toward the reflector surface, achieving concentration without high energy consumption or mechanical moving parts traditional to centrifugation and filtration systems
Solution Approach 2:
The system dynamically adjusts the acoustic frequency parameter to match the eigenfrequency of the fluid volume, maximizing resonant effect and energy transfer efficiency. By operating at resonant frequencies rather than fixed high-power ultrasonic frequencies, the system achieves effective microalgae separation with minimal energy input
2Productivity
If conventional filtration methods are used, then microalgae can be separated, but filter fouling occurs limiting productive operation time
Solution Approach 1:
The patent replaces mechanical filtration systems (membranes, filters) with an acoustic field-based separation mechanism. Ultrasonic waves create radiation pressure that moves microalgae through the fluid without physical contact with filter media, eliminating filter fouling entirely and enabling continuous uninterrupted operation
Solution Approach 2:
The acoustic field serves as an intermediary mechanism between the energy source and microalgae separation. Rather than direct mechanical contact with filters, the ultrasonic field mediates the separation process through resonant oscillation and acoustic radiation pressure, preventing the clogging issues inherent in direct filtration
3Productivity
If conventional centrifugation and filtration systems are used, then microalgae concentration is achieved, but additional chemical additives (flocculants, solvents) are required
Solution Approach 1:
The patent replaces chemical-based separation methods (flocculation, solvent extraction) with pure physical acoustic field manipulation. Ultrasonic radiation pressure achieves microalgae concentration without introducing any chemical substances into the system, eliminating the need for flocculants and solvents that would contaminate the biocrude product
Solution Approach 2:
The system uses the inherent acoustic properties of the fluid-microalgae mixture itself to achieve separation. By exciting resonant modes of the fluid volume, the system leverages the natural acoustic response of the medium to generate separation forces, requiring no external chemical additives or reagents
4Productivity
If current ultrasound devices are used for microalgae separation, then separation can be achieved, but cost and energy usage remain prohibitively inefficient
Solution Approach 1:
The system dynamically adjusts the acoustic frequency parameter to match the eigenfrequency of the specific fluid volume being processed. By operating at resonant frequencies rather than fixed high-power ultrasonic frequencies, the system achieves effective microalgae separation with minimal energy input, dramatically improving energy efficiency compared to conventional ultrasound devices
Solution Approach 2:
The patent applies ultrasonic vibration to the fluid containing microalgae, causing resonant oscillation at eigenfrequencies. This mechanical vibration creates acoustic radiation pressure that drives phase-separate materials (microalgae) toward the reflector surface, achieving concentration without high energy consumption or mechanical moving parts traditional to centrifugation and filtration systems
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 device improves the efficiency of microalgae separation and biocrude production by matching the output frequency with eigenfrequencies of the fluid, reducing energy consumption and operational costs while minimizing contamination risks.
Implementation Method 1
receipt of electricity at the transducer from a voltage source triggers emission of an acoustic output by the transducer, the acoustic output thereby passing through the carrier surface and the liquid chamber toward the reflector surface, the acoustic output characterized by an output frequency that is based on the one or more eigenfrequencies, the transmission of the acoustic wave thereby exciting at least the volume of fluid
Data Source
AI summary
An acoustic resonator device includes a fluid chamber with a carrier surface and a reflector surface. The fluid chamber is filled with a volume of a fluid that includes a phase-separate material such as algae. The carrier surface is coupled to a transducer, which may be a lead zirconate titanate (PZT) transducer. The transducer, when supplied with electricity, emits an acoustic wave-based output of an output frequency (e.g., ultrasound). A sensor may be used to track one or more eigenfrequencies of the volume of fluid, the acoustic resonator device, or some combination thereof. A controller may receive tracking data from the sensor and control the voltage source, the transducer, or some combination thereof to ensure that the output frequency matches one of the tracked eigenfrequencies, thereby maximizing excitation of the fluid to improve efficiency of mixing, stimulation, and separation of materials from fluid (e.g., for algal biocrude production).