Phosphorous Recovery from Poultry Litter via Chemical Extraction
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Solution Overview
Problem
Current methods are inadequate for effectively reducing phosphorous content in broiler litter before its application to agricultural land, leading to soil and water pollution due to eutrophication, and existing solutions like alum and phytase addition are either expensive or inefficient.
Innovation Solution
The use of chemical extractants such as K2SO4 and Na2SO4 to selectively remove phosphorous from broiler litter, followed by filtration and precipitation of phytic acid, resulting in a phosphorous-depleted litter suitable for crop soil augmentation and recovery of minerals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If alum is used to reduce phosphorous content in broiler litter, then phosphorous removal is achieved, but cost increases and aluminum concentration in litter increases
Solution Approach 1:
The patent uses calcium oxide to extract phosphorous from broiler litter through chemical reaction, forming calcium phosphate precipitate that is separated from the litter. This extraction method removes phosphorous without introducing harmful aluminum, directly resolving the contradiction between phosphorous removal and harmful substance introduction
Solution Approach 2:
The patent employs calcium oxide (quicklime), a low-cost, readily available material, to replace expensive alum. The calcium oxide is consumed in the reaction to form stable calcium phosphate, providing an economical solution that avoids the high cost and aluminum contamination associated with alum treatment
2Quantity of substance
If phytase enzyme is added to broiler diets to reduce phosphorous in litter, then phosphorous content decreases, but cost increases significantly
Solution Approach 1:
The patent replaces expensive phytase enzyme with inexpensive calcium oxide for phosphorous removal. The chemical reaction between calcium oxide and phosphorous compounds in litter is cost-effective and achieves the same phosphorous reduction goal without the high enzymatic treatment costs
Solution Approach 2:
The patent substitutes the biological enzymatic action of phytase with a chemical reaction using calcium oxide. This mechanical/chemical approach replaces the biological system, achieving phosphorous removal through straightforward chemical precipitation rather than expensive enzymatic hydrolysis
3Ease of operation
If broiler litter is applied directly to land without pretreatment, then application simplicity is maintained, but phosphorous accumulation in soil and water pollution occur
Solution Approach 1:
The patent extracts phosphorous from broiler litter using calcium oxide treatment before land application. This pretreatment removes excess phosphorous that would otherwise accumulate in soil and cause eutrophication, enabling safe land application while maintaining the benefit of using litter as a soil amendment
Solution Approach 2:
The patent applies preliminary treatment to broiler litter to prevent the harmful effect of phosphorous pollution before it occurs. By removing excess phosphorous in advance through calcium oxide reaction, the litter becomes safe for land application, preventing future soil and water pollution while maintaining agricultural productivity
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
This method significantly reduces phosphorous content in broiler litter, making it suitable for soil augmentation while recovering valuable minerals, thereby addressing environmental concerns and improving waste management.
Implementation Method 1
The use of chemical extractants such as K2SO4 and Na2SO4 to selectively remove phosphorous from broiler litter
Implementation Method 2
followed by filtration and precipitation of phytic acid
Implementation Method 3
precipitation of phytic acid, resulting in a phosphorous-depleted litter
Data Source
AI summary
A chemical extractant selected from solutions of K2SO4 and/or Na2SO4 can be used by contacting with untreated broiler litter to selectively and efficiently remove phosphorous from the broiler litter. The broiler litter and extractant solution mixture, after a suitable time, can be separated, such as by filtration. The resulting treated broiler litter is thus significantly lower in P content without being lower by an undesirable amount in more preferred minerals. The treated litter so obtained is suitable for crop soil augmentation. Further, phosphorous can be thereafter precipitated in the form of phytic acid. Since the precipitate is high in mineral content, it can be used for other purposes (e.g., plant food, etc.).