Rotary Drum Poultry Litter Fertilizer With Acid-Ammonia Processing
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Solution Overview
Problem
Current methods for converting poultry litter into fertilizer are inefficient, environmentally harmful, and pose health risks due to the release of greenhouse gases, pathogens, and nutrient imbalances, leading to soil and water pollution.
Innovation Solution
A process that converts poultry litter into a dry, homogenous granular or pelletized fertilizer using a rotary drum with a series of acidifying and ammoniating steps, controlled water addition, and evaporative drying to enhance nitrogen content and eliminate pathogens, odors, and contaminants, without the use of fossil fuels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If poultry litter is used as fertilizer in raw form or after traditional treatments, then nutrient availability is provided, but nutrient efficiency is poor and environmental harm occurs
Solution Approach 1:
The patent applies parameter changes by modifying the chemical composition of poultry litter through controlled acidification (pH reduction to 2.0-4.0) and ammoniation processes. These parameter changes convert organic nitrogen to ammonium form, adjust solubility characteristics, and create a fertilizer product with improved nutrient availability and balanced N-P-K ratios, thereby resolving the contradiction between providing nutrients and maintaining nutrient efficiency
Solution Approach 2:
The patent replaces traditional mechanical drying methods (which require external fossil fuel energy) with a chemical process system using acidification and ammoniation. This substitution achieves nutrient concentration and pathogen elimination through chemical reactions rather than thermal energy input, improving nutrient efficiency while maintaining nutrient availability
2Reliability
If poultry litter is heat treated to eliminate pathogens, then safety is improved, but energy consumption increases and greenhouse gases are released
Solution Approach 1:
The patent uses parameter changes by drastically reducing pH to 2.0-4.0 through acidification, creating a chemical environment that eliminates pathogens without requiring high-temperature heat treatment. This chemical parameter change achieves the same reliability in pathogen elimination as thermal treatment but with minimal energy consumption and no greenhouse gas emissions
Solution Approach 2:
The patent substitutes thermal energy-based pathogen elimination (heating/drying) with chemical energy-based elimination (acidification). The chemical process uses acid reactions to create lethal conditions for pathogens, replacing the mechanical/thermal system with a chemical system that consumes far less energy and produces no greenhouse gases
3Stability of the object's composition
If poultry litter is composted to improve stability, then organic matter is enhanced, but nitrogen loss occurs and odor is generated
Solution Approach 1:
The patent converts the harmful process of traditional composting (which causes nitrogen loss and odor) into a beneficial chemical process. By using controlled acidification followed by ammoniation, the system actually gains nitrogen through ammonia addition while achieving stability. The harmful nitrogen volatilization in composting is transformed into beneficial ammonium sulfate formation, converting a loss mechanism into a gain mechanism
Solution Approach 2:
The patent replaces the biological/composting system with a chemical processing system. Instead of relying on microbial decomposition that causes nitrogen loss and odor, the chemical acidification-ammoniation process directly converts organic matter into stable forms while adding nitrogen, eliminating the harmful side effects of composting
4Quantity of substance
If poultry litter is land applied to provide nutrients, then crop growth is supported, but water pollution and soil degradation occur
Solution Approach 1:
The patent applies parameter changes by controlling the solubility and chemical form of nutrients through pH adjustment and ammoniation. This creates a fertilizer product with balanced N-P-K ratios and controlled release characteristics, preventing the nutrient imbalances and runoff pollution associated with raw litter application while maintaining effective nutrient supply for crop growth
Solution Approach 2:
The patent replaces direct land application of raw litter with a chemical processing system that creates a refined fertilizer product. This substitution eliminates the harmful factors of raw litter (pathogens, odors, nutrient imbalances) while preserving and enhancing nutrient supply, thereby preventing water pollution and soil degradation
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 process produces a fertilizer with significantly higher nitrogen levels, balanced nutrient ratios, and improved soil health, while reducing environmental impact and health risks, achieving efficient nutrient utilization and minimal waste generation.
Implementation Method 1
introducing anhydrous ammonia or aqueous ammonia into the acidified particles from at least one location within the bed to increase the pH of the particles to enhance the nitrogen content and to thereby generate heat and increase the temperature of the particles
Implementation Method 2
utilizing the heats of reaction and dilution and evaporative cooling to maintain a free-flowing material
Data Source
AI summary
A method for producing a poultry litter-based fertilizer by a) supplying poultry litter to a rotating rotary drum, b) adding acid or a source of acid to the rotating rotary drum, wherein acid reacts with the poultry litter to form an acidified mixture, c) adding ammonia or a source of ammonia to the rotating rotary drum, d) drying and cooling the ammoniated product by evaporation of water to form a dried, cooled product in a free-flowing semi-solid or solid form, repeating the steps b) through d) until a desired nitrogen content is reached in the poultry litter-based fertilizer.