Integrated Reactor for Sludge Fertilizer Conversion
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Solution Overview
Problem
The multi-stage processing of sewage sludge to produce fertilizer is labor-intensive and environmentally impactful, particularly due to the need for drying, pelletizing, and other preparatory stages.
Innovation Solution
A method involving the direct processing of unprocessed or moist sewage sludge in a single reactor with a series of rotary drivers and reactants like sodium salts, where the mixture undergoes drying and digestion reactions at high temperatures, utilizing thermal energy for efficient conversion into fertilizer, and employing an electrically heated reactor to minimize environmental impact.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If multi-stage processing (drying, pelletizing, etc.) is used to process sewage sludge, then the conversion to fertilizer can be achieved, but the processing costs increase and environmental impact worsens
Solution Approach 1:
The patent combines multiple processing stages (drying, pelletizing, and fertilizer conversion) into a single integrated reactor system. The sewage sludge is fed directly into the reactor where it undergoes thermal processing and chemical reaction with phosphate-containing materials to produce fertilizer in one continuous operation, eliminating the need for separate drying and pelletizing stages and thereby reducing environmental impact.
Solution Approach 2:
The reactor is designed to perform multiple functions simultaneously: it serves as a drying chamber, a reaction vessel, and a fertilizer production unit. The system can process raw sewage sludge directly without requiring separate preparatory equipment, making the processing system more universal and reducing the overall environmental footprint.
2Ease of manufacture
If multi-stage processing (drying, pelletizing, etc.) is used to process sewage sludge, then the conversion to fertilizer can be achieved, but the processing costs increase
Solution Approach 1:
The patent combines multiple processing stages (drying, pelletizing, and fertilizer conversion) into a single integrated reactor system. The sewage sludge is fed directly into the reactor where it undergoes thermal processing and chemical reaction with phosphate-containing materials to produce fertilizer in one continuous operation, eliminating the need for separate drying and pelletizing stages and thereby reducing environmental impact.
Solution Approach 2:
The system operates continuously with sewage sludge being fed directly into the reactor for immediate processing. The thermal energy from the exothermic reaction between sewage sludge and phosphate-containing materials is continuously utilized for drying and processing, eliminating energy losses associated with intermittent batch processing and separate preparation stages.
3Reliability
If sewage sludge is dried and pelletized before processing, then the reaction efficiency can be improved, but the complexity of the processing system increases
Solution Approach 1:
The patent combines multiple processing stages (drying, pelletizing, and fertilizer conversion) into a single integrated reactor system. The sewage sludge is fed directly into the reactor where it undergoes thermal processing and chemical reaction with phosphate-containing materials to produce fertilizer in one continuous operation, eliminating the need for separate drying and pelletizing stages and thereby reducing environmental impact.
4Reliability
If traditional multi-stage processing is used, then thorough conversion of sewage sludge can be achieved, but the processing time increases
Solution Approach 1:
The system operates continuously with sewage sludge being fed directly into the reactor for immediate processing. The thermal energy from the exothermic reaction between sewage sludge and phosphate-containing materials is continuously utilized for drying and processing, eliminating energy losses associated with intermittent batch processing and separate preparation stages.
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 enables environmentally friendly and energy-efficient conversion of sewage sludge into fertilizer within a single reactor, reducing the need for preparatory stages and minimizing environmental impact by using thermal energy and reducing dust emissions.
Implementation Method 1
transporting the mixture of sewage sludge and reactant by means of a series of conveying elements, in particular rotary drivers, along a reaction section within the reaction chamber to a discharge point
Implementation Method 2
drying and a digestion reaction of the mixture of sewage sludge and reactant in order to convert the sewage sludge into fertilizer
Implementation Method 3
heating the mixture of sewage sludge and reactant to a temperature between 800°C and 1000°C, particularly to effect the drying and/or digestion of the sewage sludge
Implementation Method 4
The fertilizer can be cooled at the discharge point, particularly by means of a heat exchanger. The thermal energy absorbed in this process can optionally be used in the reactor for drying and/or digestion
Data Source
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AI summary
A process (200) for processing phosphate-containing raw material (131) is described. The process (200) comprises feeding (201) phosphate-containing raw material (131) and reactant into a reaction chamber (101) of a reactor (100) so that a mixture of phosphate-containing raw material (131) and reactant is formed in the reaction chamber (101), and transporting (202) the mixture of phosphate-containing raw material (131) and reactant by means of a series of conveying elements (102) along a reaction path within the reaction chamber (101) to a discharge (108) of the reaction chamber (101).Furthermore, the process (200) includes causing (203), during transport along the reaction path, a drying and a digestion reaction of the mixture of phosphate-containing raw material (131) and reaction agent in order to convert the phosphate-containing raw material (131) into fertilizer (133), as well as providing (204) the fertilizer (131) at the discharge (108) of the reaction chamber (101).