Thermochemical Conversion of Unsorted Solid Waste
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Solution Overview
Problem
Current methods for separating recyclable materials from unsorted solid waste are resource-intensive and inefficient due to the mixing of recyclable materials with non-recyclable organic wastes, which are often contaminated and difficult to process.
Innovation Solution
Thermochemical conversion of non-recyclable organic fractions into hydrochar, followed by size or density separation of recyclable materials from the hydrochar, using processes like pyrolysis, hydrothermal carbonization, and gasification, along with magnetic or electromagnetic separation for metallic materials.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If traditional mechanical sorting methods are used to separate recyclable materials from unsorted solid waste, then separation can be achieved, but resource consumption (water and human labor) increases significantly leading to high costs
Solution Approach 1:
The patent applies parameter changes by transforming the physical and chemical state of organic waste through thermal treatment (heating to specific temperatures) and chemical composition changes. This converts wet, contaminated organic waste into dry, stable hydrochar, fundamentally changing its properties to enable easy separation from recyclable materials without requiring substantial water or human labor resources.
Solution Approach 2:
The patent replaces traditional mechanical sorting systems with a thermochemical conversion system. Instead of using mechanical conveyors, screens, and manual sorting, the invention uses thermal and chemical processes to automatically separate organic waste from recyclables through in-situ transformation, eliminating the need for resource-intensive mechanical separation infrastructure.
2Ease of manufacture
If organic waste fractions are processed using traditional methods, then they can be handled, but the wet and contaminated nature of these materials increases processing difficulties and risks
Solution Approach 1:
The patent converts the harmful characteristics of organic waste (moisture, contamination, pathogenic microorganisms) into beneficial outcomes. The thermal processing not only eliminates pathogens and dries the material but also transforms the organic waste into hydrochar, a stable carbon-rich product. The contamination and moisture that previously made processing difficult are converted into advantages for separation and pathogen destruction.
Solution Approach 2:
The patent utilizes phase transitions by heating organic waste through distinct thermal stages: drying (removing moisture), decomposition (breaking down organic matter), and carbonization (forming hydrochar). These phase transitions transform the wet, contaminated starting material into a dry, stable solid product, fundamentally changing its physical state and properties to enable easy handling and separation.
3Productivity
If recyclable materials are mixed with non-recyclable organic wastes, then waste streams can be collected efficiently, but separation becomes difficult due to the mixed composition
Solution Approach 1:
The patent applies extraction by removing organic waste from the mixed waste stream through in-situ thermal and chemical transformation. The organic fraction is extracted and converted into hydrochar within the waste stream itself, separating it from recyclable materials like plastics and metals. This eliminates the need for complex detection and sorting systems, as the organic waste is automatically transformed and removed through the conversion process.
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 approach enables easier and cleaner separation of recyclable materials, reduces resource consumption, and utilizes hydrochar as a carbon-rich fuel for energy generation, while minimizing volatile organic and carbon dioxide emissions.
Implementation Method 1
heating and chemically converting said shredded non-sorted solid waste to produce a hydrochar and a recyclable materials fraction
Implementation Method 2
Thermochemical processes such as pyrolysis, combustion, gasification, hydrothermal carbonization ('HTC'), and the like can convert organic materials into solid carbonaceous materials
Implementation Method 3
separate metallic recyclable materials from hydrochar perhaps by magnetics or electromagnetics, or the like
Implementation Method 4
separate metallic recyclable materials from non-metallic recyclable materials by magnetics, electromagnetics, or the like
Data Source
AI summary
Embodiments of the present invention may provide managing waste including providing non-sorted solid waste (1), processing non-sorted solid waste in a waste handling system (21), shredding (26) non-sorted solid waste to create shredded non-sorted solid waste (27) in a waste handling system; introducing shredded non-sorted solid waste into a thermochemical conversion reactor (4); heating and even chemically converting a shredded non-sorted solid waste; producing hydrochar (22) and a recyclable materials fraction (23); recycling water (24) used in the heating and chemically processing of the shredded non-sorted solid waste in a thermochemical conversion reactor in said waste handling system; sorting (25) the recyclable materials fraction; fueling (28) a thermochemical conversion reactor with hydrochar (22); and perhaps even recycling heat from a thermochemical conversion reactor in the waste handling system.