Wind-Mixed Algal Aquaculture Ponds Without Mechanical Agitation

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Solution Overview

Problem

Existing algal aquaculture systems are costly due to the need for mechanical agitation and high capital investment in equipment like paddlewheels and liners, making large-scale algae cultivation economically unattractive.

Innovation Solution

Utilize natural wind-induced mixing by designing algal aquaculture ponds with a fetch selected based on wind speed and wave mixed layer to achieve effective mixing and circulation of algal growth medium, eliminating the need for mechanical mixers and reducing construction costs.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Stability of the object's composition

If mechanical agitation equipment (paddlewheels, mixers) is used to mix algal growth medium, then mixing effectiveness is improved, but capital cost and device complexity increase

Engineering Contradiction:

Improvemixing effectivenessVSAvoidequipment complexity

Core Design Contradiction:

Stability of the object's compositionVSDevice complexity

Solution Approach 1:

The patent replaces mechanical mixing systems (paddlewheels, mixers) with wind-induced mixing. The fetch is designed to be sufficient for wind to effectively mix the algal growth medium, eliminating the need for mechanical agitation equipment while maintaining mixing effectiveness.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The system uses natural wind energy to perform the mixing function that would otherwise require mechanical equipment. The fetch is optimized to allow wind to naturally circulate and mix the algal growth medium, making the system self-sufficient without external mechanical intervention.

Inventive Principle:

Principle #25Self-service

2Stability of the object's composition

If mechanical agitation equipment is installed, then mixing effectiveness is improved, but capital cost increases

Engineering Contradiction:

Improvemixing effectivenessVSAvoidcapital cost

Core Design Contradiction:

Stability of the object's compositionVSEase of manufacture

Solution Approach 1:

The patent eliminates mechanical mixing equipment by utilizing wind-induced mixing. The fetch is designed to be sufficient for wind to effectively mix the algal growth medium, thereby reducing capital costs associated with purchasing, installing, and maintaining mechanical agitation equipment.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The system replaces expensive mechanical equipment with a passive design that uses natural wind energy. The only structural requirement is the fetch configuration, which is much cheaper to implement than mechanical mixers, reducing overall capital investment.

Inventive Principle:

Principle #27Cheap short-living objects (Disposable)

3Productivity

If multiple small ponds with mechanical mixers are used for scale-up, then productivity is improved, but device complexity and capital cost increase

Engineering Contradiction:

Improveproduction capacityVSAvoidsystem complexity

Core Design Contradiction:

ProductivityVSDevice complexity

Solution Approach 1:

The patent applies segmentation by using multiple open algal aquaculture ponds arranged in series or parallel configurations. Each pond is designed with sufficient fetch for wind mixing, allowing the system to scale up productivity through numbers while avoiding the complexity of mechanical mixers in each unit.

Inventive Principle:

Principle #1Segmentation

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

Enables large-scale, cost-effective algae cultivation by utilizing natural wind mixing, reducing capital and operating costs associated with mechanical equipment, and allowing continuous flow operation.

Implementation Method 1

designing algal aquaculture ponds with a fetch selected based on wind speed and wave mixed layer to achieve effective mixing and circulation of algal growth medium

Methodology Applied

Scientific EffectWind-induced mixing: Wind

Implementation Method 2

wave mixed layer (WML) defined by a specified depth from the surface of the algal aquaculture pond

Methodology Applied

Scientific EffectWave mixed layer: Turbulence

Data Source

PatentUS20250340824A1Processes and systems of culturing algae and mixing growth medium in an algal aquaculture pond

Publication Date: 2025.11.06 NESTE OYJ

AI summary

There are disclosed processes and systems of culturing and mixing algal growth medium in at least one open algal aquaculture pond for a continuous flow system without requiring mechanical mixing devices. The process involves constructing an open algal aquaculture pond possessing a fetch selected as a function of a specified wind speed and a wave mixed layer (WML) defined by a specified depth from the surface of the pond; supplying algal growth medium to the open algal aquaculture pond, the pond having at least partially a manmade configuration; and culturing algae in the algal growth medium in the open algal aquaculture pond; and wherein a ratio of the WML of the algal growth medium to a total depth of the algal growth medium in the pond is greater than about 0.2. Also disclosed are uses of the mixed algal aquaculture medium and systems for culturing algae.