Portable Pugmill Silo System for Landfill Waste Processing
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Solution Overview
Problem
Current landfill waste processing systems are inefficient and impractical for portable use due to issues with stability, alignment, and maintenance on uneven terrain, and lack the ability to quickly process large volumes of waste without substantial delay or spillage, especially when dealing with wet conditions and tall silos.
Innovation Solution
A portable pugmill system with solid and liquid feed conveyors, a receiving conveyor, and a portable silo design that can be moved over uneven terrain, using structural sleds or trailers, and equipped with dust hoods and electronic control systems to manage waste processing and minimize dust generation, allowing for efficient mixing and discharge of landfill-ready waste.
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 transported in landfill conditions and requires substantial delay for loading and processing
Solution Approach 1:
The system divides the solid storage function into separate modular units (silo modules) that can be independently positioned and fed to the pugmill, eliminating the need for a single tall vertical silo and enabling parallel loading operations
Solution Approach 2:
Solids are pre-loaded into silo modules before the truck arrives, and multiple silos can be prepared in advance, allowing immediate feeding to the pugmill when the truck is ready, eliminating waiting time
2Reliability
If a fixed processing system is used, then stable operation is achieved, but the system cannot be moved to various locations on the landfill and requires complex infrastructure
Solution Approach 1:
The system transitions from a fixed installation to a mobile configuration using wheeled platforms and trailers that can be repositioned across the landfill surface, maintaining operational stability through movable support structures and adjustable positioning mechanisms
Solution Approach 2:
The mobile pugmill system serves multiple functions: it can be positioned at different landfill locations, process various waste types, and adapt to changing operational requirements, replacing the need for multiple fixed installations
3Reliability
If batch processing techniques are used in open-top containers, then waste solidification is achieved, but the process is time-consuming and requires a large portion of the landfill
Solution Approach 1:
The system enables continuous processing by continuously feeding solids from silos into the pugmill while the truck is positioned, eliminating batch processing interruptions and maintaining constant mixing and solidification action
Solution Approach 2:
The system uses pneumatic conveying to rapidly transport solids from silos to the pugmill and hydraulic systems for efficient mixing and discharge, dramatically increasing processing speed compared to manual batch methods
4Ease of operation
If the pugmill is made portable on wheels, then ease of movement is improved, but stability and alignment become problematic on uneven landfill terrain
Solution Approach 1:
The mobile pugmill incorporates adjustable support legs and leveling mechanisms that dynamically adapt to uneven terrain, maintaining stable operation and proper alignment regardless of ground conditions
Solution Approach 2:
The system uses outrigger supports and counterweight mechanisms to stabilize the pugmill during operation on mobile platforms, compensating for the instability inherent in wheeled configurations on soft landfill surfaces
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 system enables efficient and portable waste processing, reducing fugitive dust and enabling the disposal of difficult-to-handle waste types like coal combustion byproducts, while ensuring compliance with regulations such as the Paint Filter Test, and allowing for rapid processing and minimal downtime.
Implementation Method 1
mixing waste liquids, sludges and other semi-solid wastes with absorbent materials or other solid (dry) wastes
Implementation Method 2
one or more portable devices for facilitating periodic feeding of the pugmill with waste to be solidified into a landfill-ready state
Implementation Method 3
equipped with dust hoods and electronic control systems to manage waste processing and minimize dust generation
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 base frame for supporting a landfill waste enclosure such as a silo or pressurized vessel may be used. An improved slide gate for use with the silo, as well as an improved feed hopper for conveying landfill waste, are also disclosed.