Algae Production via Free Ammonia pH Control
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The commercialization of algae biofuels is hindered by high production costs and the threat of grazing pests like rotifers, which can cause algal cultures to crash, necessitating effective and cost-efficient methods for pest control without harming the algae.
Innovation Solution
The method involves using wastewater with elevated free ammonia levels, maintained at a pH of 8 to 9 for extended periods, to inhibit rotifer populations without affecting algal growth, thereby optimizing exposure time to maximize algal productivity and minimize grazer impact.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If conventional pest control methods are used to inhibit rotifers, then grazing pressure on algae is reduced, but algal growth is also inhibited
Solution Approach 1:
The patent applies different pH conditions to different organisms: maintaining pH 8-9 creates a locally optimized environment that is toxic to rotifers while remaining favorable for algal growth. This selective environmental modification allows differential impact on target vs. non-target organisms.
Solution Approach 2:
The patent changes the pH parameter of the cultivation medium to 8-9, which transforms the chemical environment to selectively inhibit rotifers while promoting algal growth. This parameter modification creates a therapeutic window where the same environmental condition has opposite effects on different organisms.
2Object-affected harmful factors
If pH is maintained at 8 to 9 for extended periods to maximize rotifer inhibition, then pest control effectiveness increases, but energy consumption and operational complexity increase
Solution Approach 1:
The patent employs algae's own photosynthetic activity to generate the desired pH increase naturally during daylight hours. The system self-regulates by utilizing algal metabolism to produce the therapeutic pH condition, eliminating the need for external energy input for pH control.
Solution Approach 2:
The patent implements periodic pH management where pH is allowed to rise naturally during daytime through photosynthesis and is then lowered at night using acid addition. This periodic approach reduces overall chemical consumption compared to continuous pH maintenance while still achieving effective rotifer control during critical growth periods.
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 approach effectively reduces rotifer populations while maintaining or increasing algal concentrations, providing a cost-effective solution for protecting algae from grazing organisms without reducing algal productivity, thus enhancing the viability of large-scale algae biomass production.
Implementation Method 1
wastewater comprising free ammonia and maintaining pH of at least 8 for more than two hours
Data Source
AI summary
Method of inhibiting live grazing organisms in an algae composition are disclosed, which do not inhibit the algae. In certain embodiments the concentration of algae increases. In other embodiments the mortality of live grazing organisms is complete. The method contacts an algae composition with wastewater comprising free ammonia and maintaining pH of at least 8 for more than two hours.