Portable Pugmill for Landfill Waste Solidification
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Solution Overview
Problem
Current waste solidification processes in landfills are inefficient and cumbersome, particularly due to the need for fixed systems that are difficult to move and operate in variable terrain, leading to time-consuming batch processing and challenges with fugitive dust and free liquids.
Innovation Solution
A portable pugmill system with conveyors and a liquid pump, mounted on structural sleds or trailers, allows for efficient mixing and solidification of waste liquids with dry materials on-site, reducing dust and enabling rapid processing of waste materials like coal ash and scrubber waste, without the need for tall silos or long-term storage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If a fixed processing system with tall vertical silos is used, then large capacity solid storage is provided, but the system cannot be easily moved and cannot be safely transported in landfill conditions
Solution Approach 1:
The system divides the solid storage function into separate mobile silos that can be independently positioned and fed by pneumatic trucks, rather than using a single fixed tall silo. This allows the storage capacity to be maintained while achieving portability and adaptability to different landfill locations.
2Reliability
If batch processing techniques are used, then waste solidification is achieved, but the process is time-consuming and inefficient
Solution Approach 1:
The system enables continuous processing by feeding the pugmill continuously from mobile silos or directly from pneumatic trucks, eliminating the batch-to-batch interruptions and setup times inherent in traditional batch processing methods.
3Adaptability or versatility
If a portable system is attempted with wheeled conveyors, then ease of movement is improved, but stability is compromised on variable landfill terrain
Solution Approach 1:
The system uses mobile silos and pneumatic feeding that can be dynamically positioned and adjusted on variable terrain without requiring stable wheeled conveyors. The pneumatic truck feeding system adapts to different ground conditions, maintaining both portability and operational stability.
4Quantity of substance
If tall vertical silos are used in a fixed system, then large capacity storage is achieved, but the system requires substantial setup time and cannot be rapidly deployed
Solution Approach 1:
The storage system is segmented into multiple mobile silos that can be independently transported and positioned, eliminating the time-consuming installation of a single fixed tall silo structure while maintaining equivalent or greater total storage capacity.
5Quantity of substance
If pneumatic loading is used in a fixed system, then waste is loaded into silos, but the process takes about 45 minutes per truck plus additional processing time
Solution Approach 1:
The system pre-positions mobile silos near the pugmill before processing begins, and uses pneumatic trucks that can directly feed the pugmill or nearby silos, eliminating the sequential 45-minute loading plus 15-minute processing time by having materials ready in advance at the point of use.
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 portable system enables efficient and rapid processing of landfill waste, reducing fugitive dust and ensuring compliance with regulations like the Paint Filter Test, allowing for on-site solidification and direct disposal, thus improving operational efficiency and reducing equipment setup time.
Implementation Method 1
The portable system enables efficient and rapid processing of landfill waste, reducing fugitive dust and ensuring compliance with regulations like the Paint Filter Test, allowing for on-site solidification
Data Source
AI summary
A portable system and method for processing waste to be solidified and placed in an active cell of a landfill. A portable pugmill is moveable adjacent an active cell of a landfill; and portable devices, which may be mounted on sleds or trailers, may be used for feeding the pugmill with waste to be solidified into a landfill-ready state. The waste may be fed to the pugmill without the need for long-term waste storage devices, and avoiding substantial delays between discharge of the waste from trucks to the pugmill-feeding steps.