Two-Stage Algae Cultivation for Biodiesel Production

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Solution Overview

Problem

Current biofuel production relies heavily on food crops, which require premium land, water, and energy inputs, making it inefficient and environmentally unsustainable, and existing algae cultivation methods are limited in scale and efficiency.

Innovation Solution

Cultivating oil-producing algae through sequential photoautotrophic and heterotrophic growth, using a sugar feed to enhance oil production, and converting the algal oil into biodiesel via transesterification, utilizing a system with algae growth reservoirs, sugar separators, and conversion reactors.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If food crops are used for biofuel production, then fuel output is achieved, but land use and water consumption increase significantly

Engineering Contradiction:

Improvefuel outputVSAvoidland use

Core Design Contradiction:

ProductivityVSArea of stationary object

Solution Approach 1:

The patent introduces algae as an intermediary organism that converts CO2 directly into oil through photosynthesis and heterotrophic growth. This mediator eliminates the need for traditional food crop cultivation, achieving fuel production without competing for agricultural land or water resources.

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The patent changes the fundamental parameter of feedstock type from terrestrial plants to aquatic microorganisms. By switching from crop-based to algae-based production, the system achieves higher oil yield per unit area while eliminating the need for premium agricultural land and excessive water inputs.

Inventive Principle:

Principle #35Parameter changes

2Productivity

If traditional biofuel methods are used, then fuel production is achieved, but competition with food crops occurs

Engineering Contradiction:

Improvefuel productionVSAvoidcompetition with food crops

Core Design Contradiction:

ProductivityVSAdaptability or versatility

Solution Approach 1:

The patent segments the biofuel production process into distinct phases: photoautotrophic growth for biomass accumulation and heterotrophic growth for oil production. This segmentation allows algae to be cultivated in non-arable areas during the photoautotrophic phase, completely separating fuel production from food crop cultivation.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent moves biofuel production from the two-dimensional terrestrial plane (crop fields) to the three-dimensional aquatic environment (ponds, bioreactors). This dimensional shift allows simultaneous food and fuel production without spatial competition, as algae grow in water bodies that do not compete with agricultural land.

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

3Productivity

If algae cultivation is expanded to increase oil production, then fuel output improves, but cultivation scale and efficiency remain limited

Engineering Contradiction:

Improveoil productionVSAvoidcultivation system

Core Design Contradiction:

ProductivityVSDevice complexity

Solution Approach 1:

The patent applies preliminary action by first cultivating algae photoautotrophically to build up biomass, then transitioning to heterotrophic conditions to trigger oil accumulation. This two-stage preliminary preparation ensures high oil content before harvest, increasing overall productivity without proportionally increasing system complexity.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The patent implements periodic action through cyclic switching between photoautotrophic and heterotrophic growth phases. This periodic manipulation of cultivation conditions optimizes both biomass production and oil accumulation, achieving high productivity through rhythmic process variation rather than continuous complex operations.

Inventive Principle:

Principle #19Periodic action

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 method allows for the efficient production of biodiesel with minimal land and water use, reducing competition with food crops and environmental impact, while achieving higher energy density and lower emissions compared to traditional biofuels.

Implementation Method 1

Almost all biological energy starts with the conversion of sunlight to carbohydrates through photosynthesis

Methodology Applied

Scientific EffectPhotosynthesis: Photosynthesis

Implementation Method 2

producing oil by heterotrophic growth of algae wherein the heterotrophic algae growth is achieved by introducing a sugar feed to the oil-producing algae

Methodology Applied

Scientific EffectHeterotrophic growth: Fermentation

Implementation Method 3

using a system with algae growth reservoirs, sugar separators, and conversion reactors

Methodology Applied

Scientific EffectSeparation:

Implementation Method 4

converting the algal oil into biodiesel via transesterification

Methodology Applied

Scientific EffectTransesterification:

Data Source

PatentUS11781162B2Two-stage process for producing oil from microalgae

Publication Date: 2023.10.10 GENIFUEL CORP

AI summary

A process for production of biofuels from algae can include cultivating an oil-producing algae by promoting sequential photoautotrophic and heterotrophic growth. The method can further include producing oil by heterotrophic growth of algae wherein the heterotrophic algae growth is achieved by introducing a sugar feed to the oil-producing algae. An algal oil can be extracted from the oil-producing algae, and can be converted to form biodiesel.