Algae Lipid Enrichment via Nitrogen Depletion and High Light
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Solution Overview
Problem
Current methods for increasing lipid content in algae for biofuel production are inefficient due to high chlorophyll content, which causes issues in oil refining, and the transition from growth to lipid accumulation phase is slow, leading to prolonged cultivation times and high capital expenses.
Innovation Solution
Depleting algal cells of nutrients, especially nitrogen, while exposing them to high-intensity light simultaneously, to rapidly switch from the growth phase to lipid accumulation phase, resulting in higher lipid content and lower chlorophyll levels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If algae cells are depleted of nutrients to increase lipid content, then lipid accumulation is improved, but cellular chlorophyll levels also decrease which causes problems in oil refining
Solution Approach 1:
The patent applies parameter changes by simultaneously adjusting multiple cultivation parameters: nutrient depletion (nitrogen limitation), light intensity (high light conditions), and temperature (15-25°C). This combination of parameter changes triggers a physiological response in algae that increases lipid accumulation while reducing chlorophyll content, thereby improving both lipid quantity and oil refining quality
2Quantity of substance
If traditional two-step cultivation process is used to increase lipid content, then lipid accumulation is improved, but cultivation time is extended from days to weeks
Solution Approach 1:
The patent applies preliminary action by pre-adapting algae cells to specific physiological conditions (nutrient-depleted state with high light exposure) during the growth phase. This preliminary adaptation primes the cells to rapidly transition to lipid accumulation mode when transferred to production conditions, eliminating the need for prolonged separate starvation phases and reducing total cultivation time from weeks to days
3Quantity of substance
If high light intensity is applied to increase lipid content, then lipid accumulation is improved, but cellular stress increases which may affect cell viability
Solution Approach 1:
The patent applies local quality by creating different environmental conditions for different physiological processes: nutrient depletion and high light intensity are applied specifically during the lipid accumulation phase, while maintaining adequate nutrients and moderate light during the growth phase. This spatial and temporal differentiation of environmental conditions allows high light to benefit lipid production without causing excessive cumulative stress that would harm cell viability
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 significantly increases the lipid-to-chlorophyll ratio, shortening cultivation time and making the process more economically viable for biofuel production by reducing the need for chlorophyll removal and improving catalytic conversion in biofuel processing.
Implementation Method 1
Photoacclimation is a universally noted phenomenon, where photosynthetic pigments are decreased in high light to balance the amount of light harvested versus the amount of energy that can be used by the cells
Data Source
AI summary
The present description is related to the field of cultivating algae. It introduces a method of cultivating algae by depleting the culture of an inorganic nutrient and exposing the alga to high intensity light to obtain algal cell mass having enriched lipid content and reduced chlorophyll content.