Guar Meal Fish Feed Binders for Faeces Shear Resistance
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Solution Overview
Problem
Recirculating Aquaculture Systems face challenges in reducing the degradation of fish faeces and uneaten feed particles, leading to increased nutrient leakage into water bodies, as existing binders are ineffective in enhancing the mechanical strength and shear resistance of these particles.
Innovation Solution
Incorporating guar meal, extracted from guar beans or guar germ, into fish feed as a protein substitute, combined with starch and non-starch binding agents like alginate or guar gum, to increase the shear resistance of faeces and uneaten feed particles, facilitating efficient filtration and separation in RAS systems.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If conventional binders are used in fish feed, then the feed is easy to manufacture and cost-effective, but the faeces particles have insufficient mechanical strength and shear resistance, leading to degradation into finer particles
Solution Approach 1:
The patent uses composite binding materials comprising both starch-based binders (such as wheat starch, potato starch, or corn starch) and non-starch binders (such as alginate, carrageenan, or guar gum) in specific combinations to achieve enhanced mechanical strength and shear resistance of faeces particles. This composite approach allows the feed to maintain ease of manufacture while producing faeces with sufficient integrity for filtration.
Solution Approach 2:
The patent optimizes the concentration and molecular weight parameters of the binding agents to achieve the desired shear resistance. Specifically, it employs starch binders at concentrations of 0.1-5% with appropriate viscosity ranges, and non-starch binders at optimized levels, thereby controlling the rheological properties of the faeces to prevent disintegration without complicating the manufacturing process.
2Loss of substance
If faeces particles are allowed to remain in water bodies, then filtration costs are reduced, but nutrient leakage into the environment increases
Solution Approach 1:
The patent applies preliminary binding action by incorporating specific binders into the feed formulation before the fish consume it. These binders pre-strengthen the faeces particles during digestion, ensuring they maintain structural integrity when excreted. This preliminary action prevents disintegration during transport and filtration, thereby reducing nutrient leakage while maintaining efficient solid-liquid separation in RAS systems.
3Stability of the object's composition
If feed particles are made more resistant to degradation, then nutrient leakage is reduced, but the feed becomes harder to manufacture and process
Solution Approach 1:
The patent achieves feed particle stability by controlling the physical and chemical parameters of the binding agents rather than requiring complex processing equipment. It specifies starch binders with viscosity ranges of 10-1000 cP and non-starch binders with appropriate molecular weights, allowing standard extrusion or pelleting equipment to produce stable feed particles without modification.
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
Guar meal significantly enhances the particle size and stability of faeces and feed particles, preventing degradation and enabling effective filtration, thereby reducing nutrient leakage and improving water quality in fish farms.
Implementation Method 1
Incorporating guar meal, extracted from guar beans or guar germ, into fish feed as a protein substitute, combined with starch and non-starch binding agents like alginate or guar gum, to increase the shear resistance of faeces and uneaten feed particles
Implementation Method 2
The feed contains, in addition to starch as an ordinary binder, a so-called 'faecal binder' of a non-starch type. The faecal non-starch binder can be alginate, algal meal or guar gum.
Data Source
AI summary
An extruded, pressed or particulate fish feed is described. Also described is a method for reduction of the content of undesired nutrients in water discharged from a fish farm, and a process for increasing the mechanical strength or shear resistance of faeces from fish in a fish farm.