Aquaculture Filtration with CO2 Stripper and Nitrification Bed
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Solution Overview
Problem
Aquaculture systems face challenges in managing water chemistry, particularly with increasing fish density, where toxic metabolites and pathogens can form, and existing filtration systems are inadequate in removing carbon dioxide and ammonia effectively.
Innovation Solution
A combined mechanical and biological filtration system is introduced, featuring a mechanical filter with a sieve and a biological filter equipped with a carbon dioxide stripper and a nitrification bed of hydrophobic micro-beads coated with hydrophilic materials to support nitrifying bacteria growth, ensuring efficient removal of solids, carbon dioxide, and ammonia.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If fish density is increased to improve productivity, then aquaculture output increases, but toxic metabolites and pathogens accumulate in the water
Solution Approach 1:
The filtration system is divided into three distinct stages: mechanical filtration (solid-liquid separation), biological filtration (ammonia removal via nitrifying bacteria), and chemical filtration (carbon dioxide removal via aeration). This segmentation allows each stage to target specific harmful substances, effectively addressing the pollution problem while maintaining high fish density for improved productivity.
2Device complexity
If conventional filtration systems are used, then system complexity is reduced, but carbon dioxide and ammonia removal is insufficient
Solution Approach 1:
The patent merges three previously separate filtration functions into a single integrated system: mechanical filtration using a filter pad, biological filtration using nitrifying bacteria on substrate, and chemical filtration using aeration for CO2 removal. This combination maintains relative system simplicity while achieving comprehensive removal of multiple harmful substances including ammonia and carbon dioxide.
3Reliability
If filtration efficiency is improved to remove more harmful substances, then water quality improves, but system complexity and cost increase
Solution Approach 1:
The biological filtration component utilizes nitrifying bacteria that naturally convert ammonia to nitrate, eliminating the need for energy-intensive mechanical ammonia removal systems. The aeration system simultaneously performs oxygenation and carbon dioxide removal. These self-service mechanisms improve water quality reliability while avoiding excessive system complexity and operational costs.
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 system achieves a nitrification rate of 0.5 to 2.5 grams of nitrite per liter per day, effectively improving water quality by removing hazardous substances and preventing pathogen growth, thus enhancing aquaculture conditions.
Implementation Method 1
a carbon dioxide stripper
Implementation Method 2
a nitrification bed comprising a carbon dioxide stripper and a nitrification bed of hydrophobic micro-beads coated with hydrophilic materials to support nitrifying bacteria growth
Implementation Method 3
Bacteria that convert ammonia to nitrogen under aerobic conditions
Implementation Method 4
hydrophobic micro-beads coated with hydrophilic materials to support nitrifying bacteria growth
Implementation Method 5
The multiple micro-beads are characterized as being hydrophobic
Data Source
Figure 1
Figure 2A~2E
Figure 3A~3B
AI summary
A water filter, comprising a mechanical filter and a biological filter in fluid communication with the mechanical filter is disclosed. The biological filter comprises a carbon dioxide stripper and a nitrification bed.