Phosphorus Extraction via pH-Adjusted Struvite Precipitation
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Solution Overview
Problem
Current technologies for separating solids and nutrient components from animal waste are costly, energy-intensive, and result in environmental pollution, failing to effectively convert high concentrations of animal waste into useful nutrients and products.
Innovation Solution
The Phosphorus Extraction and Recovery System (PEARS) processes manure sources to extract ammonia, struvite, and potassium struvite, utilizing reaction vessels, solid-liquid separation modules, and controlled pH adjustments to separate and precipitate nutrients without the need for additional chemicals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If current separation technologies are used to separate solids and nutrient components from animal waste, then separation can be achieved, but the process becomes costly and energy-intensive
Solution Approach 1:
The patent applies parameter changes by adjusting pH levels to trigger precipitation of phosphorus as struvite. By controlling pH to specific ranges (e.g., pH 7-9 for struvite formation), the system transforms dissolved phosphorus into solid precipitate, enabling separation without energy-intensive equipment. This chemical parameter change achieves reliable separation while minimizing energy consumption.
Solution Approach 2:
The patent replaces mechanical separation systems (centrifuges, filters, membranes) with a chemical precipitation approach. Instead of using mechanical force to separate solids from liquids, the system uses chemical reactions to transform dissolved nutrients into solid forms that naturally settle, eliminating the need for complex mechanical equipment and reducing energy requirements.
2Reliability
If current separation technologies are used to separate solids and nutrient components from animal waste, then separation can be achieved, but capital equipment costs and operational costs increase
Solution Approach 1:
The patent employs simple, low-cost chemical reagents (acids or bases for pH adjustment) that can be easily obtained and disposed of, replacing expensive capital equipment. The system uses inexpensive materials like limestone, calcium hydroxide, or sulfuric acid to achieve separation, significantly reducing both capital and operational costs while maintaining separation effectiveness.
Solution Approach 2:
The system utilizes the natural precipitation behavior of phosphorus compounds under controlled pH conditions, eliminating the need for complex external equipment. The chemical process self-regulates through natural settling and filtration mechanisms, reducing dependence on expensive mechanical systems and lowering overall system cost.
3Productivity
If animal waste is used as fertilizer in fields, then nutrients are provided for food production, but leaching of chemicals into drainage waters and run-off streams occurs causing environmental pollution
Solution Approach 1:
The patent extracts and removes phosphorus from liquid animal waste through precipitation and solid-liquid separation. By taking out dissolved phosphorus and converting it to solid struvite crystals that can be filtered and removed, the system prevents chemical leaching into drainage waters while preserving the nutrient value for agricultural use.
Solution Approach 2:
The system converts the harmful dissolved phosphorus in liquid waste into beneficial solid struvite fertilizer through controlled precipitation. This transformation turns a pollution problem into a useful product, eliminating leaching risks while providing high-purity fertilizer for food production.
4Productivity
If high concentrations of animal waste are processed to recover nutrients, then useful products are generated, but the process requires large quantities of fuel and labor
Solution Approach 1:
The patent uses rapid pH adjustment to trigger immediate precipitation of phosphorus. By quickly changing pH parameters (e.g., adding lime or sulfuric acid), the system achieves fast formation of struvite crystals, significantly reducing processing time compared to slow natural settling or thermal processing methods.
Solution Approach 2:
The system maintains continuous operation through automated pH monitoring and controlled addition of reagents, ensuring uninterrupted precipitation and separation processes. This continuous action eliminates idle time and labor interruptions, improving productivity while reducing overall processing time.
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
PEARS achieves efficient extraction and recovery of phosphorus and other nutrients, reducing environmental pollution, lowering operational costs, and providing high-purity nutrient-rich products suitable for use as fertilizers.
Implementation Method 1
at least one solid-liquid separation module in fluid communication with at least one reaction vessel, wherein the at least one solid-liquid separation module separates contents of at least one reaction vessel into a substantially solid fraction and a substantially liquid fraction
Implementation Method 2
PEARS processes manure sources to extract ammonia, struvite, and potassium struvite, utilizing reaction vessels, solid-liquid separation modules, and controlled pH adjustments to separate and precipitate nutrients
Data Source
AI summary
Separation methods and systems for converting high concentrations of animal wastes and other nutrient-rich organic materials into nutrients and other useful products such as struvite and potassium struvite. Advantageously, the system and methods do not require the addition of external chemicals other than an acid and a base.