Paracoccus Bacteria for Aquaculture Hydrogen Sulfide Control
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Solution Overview
Problem
Current methods for controlling hydrogen sulfide in aquatic and marine environments, such as fish farms and ponds, are either expensive or ineffective, leading to reduced yield and quality of aquatic and marine animals, as they often rely on chemical oxidizers or partial water exchange which can be detrimental to the animals and economically unsustainable.
Innovation Solution
Introducing sulfur oxidizing bacteria from the genus Paracoccus into the water body or sediment, along with modifying the water chemistry to make sulfur chemical species thermodynamically unfavorable, effectively reducing hydrogen sulfide levels and improving animal yield and quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If chemical oxidizers (ozone, chlorine dioxide, peroxide) are added to the water body, then hydrogen sulfide levels are reduced, but the cost of treatment increases and aquatic animals may be harmed
Solution Approach 1:
The system employs indigenous sulfur-oxidizing bacteria that naturally occur in the aquaculture environment to convert hydrogen sulfide into less harmful forms. This self-service approach eliminates the need for expensive external chemical oxidizers while maintaining effectiveness in controlling hydrogen sulfide levels and protecting aquatic animals.
Solution Approach 2:
Sulfur-oxidizing bacteria serve as a biological intermediary between hydrogen sulfide and the aquatic environment. These bacteria mediate the conversion of toxic hydrogen sulfide into less harmful sulfur compounds, providing a safe and cost-effective treatment mechanism that avoids direct contact between chemical oxidizers and aquatic animals.
2Productivity
If oxygen is added to the water body through biochemical media systems, then aerobic species growth is promoted, but hydrogen sulfide concentration in sediment is not altered and treatment cost increases
Solution Approach 1:
The system utilizes naturally present sulfur-oxidizing bacteria in the sediment to convert hydrogen sulfide without requiring external oxygen delivery systems. This approach simultaneously addresses hydrogen sulfide control and supports aerobic conditions, eliminating the need for costly biochemical media systems while improving sediment quality.
Solution Approach 2:
The invention extracts and utilizes the functional capability of sulfur-oxidizing bacteria that naturally exist in the environment, separating this beneficial function from the need for complex external oxygen delivery systems. By harnessing this indigenous biological capability, the system achieves both hydrogen sulfide reduction and aerobic condition promotion.
3Object-affected harmful factors
If partial water exchange is performed to reduce hydrogen sulfide levels, then hydrogen sulfide concentration is reduced, but the method is impractical, expensive, and may introduce contaminants
Solution Approach 1:
The system employs indigenous sulfur-oxidizing bacteria to continuously convert hydrogen sulfide in situ, providing a self-sustaining treatment mechanism that does not require water exchange operations. This eliminates the practical difficulties, costs, and contamination risks associated with partial water exchange while maintaining effective hydrogen sulfide control.
Solution Approach 2:
Sulfur-oxidizing bacteria act as a biological intermediary that processes hydrogen sulfide within the existing water body, eliminating the need to remove or exchange water. This in-situ biological treatment approach avoids the operational complexities and contamination risks of water exchange while effectively reducing hydrogen sulfide levels.
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 method significantly reduces hydrogen sulfide concentrations, maintaining levels below 1 part-per-million for at least a week, thereby enhancing the yield and quality of aquatic and marine animals by establishing a stable population of sulfur oxidizing bacteria and optimizing water chemistry.
Implementation Method 1
aerobic bacteria produce, inter alia, phosphates, carbon dioxide and ammonia... anaerobic microorganisms tend to generate, inter alia, hydrogen sulfide
Implementation Method 2
modifying the water chemistry to make the reduction of sulfur chemical species thermodynamically unfavorable
Data Source
AI summary
Methods of treating aquatic or marine animal water bodies including contacting the water body with one or more sulfur oxidizing bacteria such as those selected from the genus Paracoccus in an amount sufficient to control, reduce, or eliminate the H2S in the water body is disclosed. One or more sulfur oxidizing bacteria selected from the genus Paracoccus are applied to H2S contaminated environments in a predetermined amount effective in improving the yield and quality of aquatic or marine animals therein. Compositions useful for treating aquatic or marine animal water bodies are also described.