Solid Waste Composite Materials for Sustainable Building
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Solution Overview
Problem
Current methods for managing solid waste, such as recycling and landfills, are inefficient, as they often require source-separated materials and result in a significant portion of municipal solid waste being landfilled due to contamination and high processing costs, while also depleting natural resources and increasing landfill capacity issues.
Innovation Solution
The development of methods and systems to create composite materials from processed mixed wastes, involving the heating and mixing of sorted solid waste compositions, with the addition of polymers and other additives, to produce sustainable building materials that can utilize residual waste, reducing the need for landfills and natural resources.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If source-separated recycling methods are used, then material purity is improved, but processing complexity and cost increase significantly
Solution Approach 1:
Instead of separating materials before processing (conventional recycling), this invention processes mixed waste together and separates materials after processing. The pyrolysis process converts mixed plastics and contaminants into syngas and carbon black, with the contaminants ending up in the carbon black fraction that can be separated and utilized, thus inverting the traditional separation-before-processing approach to achieve both high purity and lower processing complexity
Solution Approach 2:
The invention changes the physical and chemical parameters of the waste materials through pyrolysis processing. By controlling temperature, residence time, and atmosphere parameters during pyrolysis, mixed waste materials are transformed into distinct phases (syngas, liquid condensates, carbon black) that can be easily separated based on their physical properties, achieving material purity without requiring pre-separation
2Loss of substance
If landfills are used for waste disposal, then waste volume reduction is achieved, but natural resource depletion increases
Solution Approach 1:
The invention converts the harmful aspect of waste (volume that needs disposal) into beneficial resources. Through pyrolysis, waste plastics are converted into syngas (energy resource), carbon black (material resource), and liquid condensates (chemical feedstocks). This transforms the waste disposal problem into a resource recovery opportunity, simultaneously reducing waste volume and generating valuable products that replace virgin materials
Solution Approach 2:
Instead of simply discarding waste in landfills, the invention implements a recovery system where pyrolysis converts waste materials into recoverable resources. The syngas is recovered for energy production, carbon black is recovered as a usable material, and liquid condensates are recovered as chemical feedstocks, thereby converting waste discarding into resource recovery that reduces both waste volume and natural resource depletion
3Use of energy by moving object
If incineration is used for waste-to-energy, then energy production is improved, but ash quality deteriorates making it unsuitable for reuse
Solution Approach 1:
The invention extracts the energy content from waste materials through pyrolysis while separating it from the solid residues. The syngas produced contains the energy that can be utilized, while the solid carbon black and liquid condensates are separated out. This extraction approach allows energy recovery without producing problematic ash, as the energy is removed in gaseous form that can be cleanly combusted or utilized
Solution Approach 2:
The invention utilizes phase transitions during pyrolysis to separate energy from residues. The organic components of waste transition from solid/liquid phases to gaseous syngas phase, which can be cleanly burned for energy. The remaining solid carbon black and liquid condensates are separated by phase, avoiding the formation of contaminated ash that would result from direct incineration
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 allows for the reuse of previously landfilled waste as sustainable building materials with enhanced compressive strength and flexibility, reducing waste volume and the demand for virgin materials, while providing an eco-friendly alternative to traditional building materials.
Implementation Method 1
heating, in a process vessel, a solid waste composition that contains mixed plastics and organic materials, such that at least a portion of the mixed plastics in the solid waste composition becomes melted
Implementation Method 2
The solid waste composition can contain from about 40 wt. % to about 86 wt. % carbon, and from about 3 wt. % to about 20 wt. % hydrogen. The composite can contain less than 5 wt. % water
Data Source
AI summary
Compositions (e.g., composites) containing processed solid waste, products made from the compositions, and systems and methods for making the compositions and products, are provided herein. For example, composites containing solid waste compositions and one or more added polymers, fillers, or other compounds are provided herein.