Ferric Sulphate Treatment for Liquid Animal Effluent Methane Reduction
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Solution Overview
Problem
The increasing use of animal effluent storage ponds on dairy farms leads to higher methane emissions, contributing significantly to greenhouse gas emissions and climate change, with existing mitigation options not being widely adopted due to practical, economic, or effectiveness issues.
Innovation Solution
The use of ferric sulphate (FS) or polyferric sulphate (PFS) to treat liquid animal effluent, reducing methane emissions by determining the appropriate dosage based on turbidity measurements, and applying it in various treatment systems including ponds, lagoons, tanks, and storage vessels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If effluent storage ponds are increased in number and size to capture and store effluent, then the risk of effluent ponding and runoff is reduced, but methane emissions increase significantly
Solution Approach 1:
The patent applies parameter changes by modifying the chemical composition of the effluent through addition of ferric sulphate or polyferric sulphate. This chemical treatment changes the anaerobic digestion parameters, specifically inhibiting methane-producing bacteria while allowing organic matter decomposition to continue, thus reducing methane emissions from storage ponds
Solution Approach 2:
The patent uses ferric sulphate or polyferric sulphate as an intermediary substance that mediates between the effluent and methane-producing bacteria. This intermediary chemical agent selectively inhibits methane generation without completely stopping organic matter breakdown, resolving the contradiction between storage capacity and emissions reduction
2Object-generated harmful factors
If conventional mitigation options such as covering ponds and flaring are implemented, then methane emissions are reduced, but the complexity and cost of the system increases
Solution Approach 1:
The patent employs a simple, inexpensive chemical treatment solution (ferric sulphate or polyferric sulphate) that can be easily applied to effluent storage ponds. This disposable chemical approach replaces complex, expensive infrastructure solutions like covering and flaring systems, maintaining effectiveness while reducing device complexity and cost
Solution Approach 2:
The patent substitutes mechanical mitigation systems (covering ponds, flaring equipment, bio-filter covers) with a chemical treatment solution. This replacement eliminates the need for complex mechanical infrastructure while achieving similar or better methane emission reduction through chemical inhibition of methane-producing bacteria
3Object-generated harmful factors
If ferric sulphate or polyferric sulphate is added to effluent, then methane emissions are significantly reduced, but the cost of treatment increases
Solution Approach 1:
The patent optimizes the dosage parameter of ferric sulphate or polyferric sulphate based on effluent characteristics such as turbidity and organic matter content. By adjusting the chemical dosage to match specific effluent conditions, the system achieves effective methane reduction while minimizing treatment costs through precise parameter matching
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 treatment with FS or PFS achieves a significant reduction in methane emissions, with up to 98% reduction demonstrated in experiments, without increasing hydrogen sulphide emissions, thus providing an effective and practical solution for mitigating methane emissions from animal effluent.
Implementation Method 1
The use of ferric sulphate (FS) or polyferric sulphate (PFS) to treat liquid animal effluent to reduce methane emissions therefrom
Implementation Method 2
treating the captured effluent directly with ferric sulphate or polyferric sulphate
Data Source
AI summary
The use of ferric sulphate or polyferric sulphate to treat liquid animal effluent to reduce methane emissions therefrom.