Sprayable Cover Composition for Landfill Waste Piles
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing cover materials for waste piles, particularly landfills, require large quantities of soil and have issues with adhesion to low-friction surfaces like plastic, leading to non-uniform coverage and instability under rain and wind, necessitating frequent reapplication.
Innovation Solution
A sprayable cover composition comprising fly ash, cement, polymers, and fibers, with a high liquid content and specialized polymers like HPMC, which provides improved adhesion, durability, and resistance to rain, allowing for quick and easy application with minimal thinning concerns.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If large quantities of soil are used to cover waste piles, then effective coverage and protection are achieved, but the available volume for waste is significantly reduced
Solution Approach 1:
The invention changes the physical and chemical parameters of the cover material by using stabilized refuse mixtures with controlled moisture content (20-40%), composition ratios, and decomposition stages. This transforms low-quality refuse into a high-performance cover material that provides effective protection with minimal thickness, thereby maximizing waste volume while maintaining coverage reliability
Solution Approach 2:
The invention creates a composite cover material by mixing refuse with varying degrees of decomposition, adjusting moisture content, and combining different refuse types. This composite approach produces a cover material with optimized properties that achieves effective coverage with reduced material quantity, solving the volume contradiction
2Adaptability or versatility
If fiber-based cover materials are used, then material availability is improved, but adhesion to low friction surfaces such as plastic is poor
Solution Approach 1:
The invention changes the surface interaction parameters by controlling moisture content (20-40%) and using refuse of varying decomposition stages. This creates a cover material with optimized adhesion properties that effectively bonds to low-friction plastic surfaces while maintaining versatility in material availability
Solution Approach 2:
The invention applies different refuse compositions to different surfaces within the landfill. By using refuse with varying decomposition stages and moisture contents, the cover material adapts its adhesion properties to match specific surface characteristics, including plastic containers, thereby achieving reliable adhesion across diverse surfaces
3Ease of operation
If high water content is used in fiber-based slurry to prevent fiber agglomeration, then sprayability is improved, but adhesion to refuse and plastic surfaces deteriorates
Solution Approach 1:
The invention optimizes the moisture content parameter to a specific range (20-40%) that simultaneously achieves fiber dispersion for sprayability and sufficient adhesion to surfaces. This parameter optimization resolves the contradiction between ease of application and bonding reliability
Solution Approach 2:
The invention changes the chemical composition parameters by incorporating refuse with varying decomposition stages and moisture contents. This creates a slurry with balanced properties that provides both sprayability and adhesion, eliminating the need for excessive water content
4Volume of stationary object
If thin cover layers are applied to maximize waste volume, then available volume is improved, but coverage durability and resistance to rain and wind deteriorate
Solution Approach 1:
The invention changes the physical parameters of the cover material by controlling moisture content (20-40%), composition ratios, and refuse decomposition stages. These parameter changes enable thin cover layers to achieve high durability and resistance to environmental factors, thereby maximizing waste volume while maintaining protection effectiveness
Solution Approach 2:
The invention creates a composite cover material with optimized internal structure by mixing refuse of varying decomposition stages and adjusting moisture content. This composite structure provides enhanced durability and environmental resistance even at minimal thickness, resolving the contradiction between volume maximization and cover durability
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 solution offers a durable, rain-resistant, and flexible cover that effectively controls odor, litter, vectors, and fire risks, maintaining integrity on various surfaces including plastics, with improved application efficiency and reduced material usage.
Implementation Method 1
the invention provides a polymer that provides adhesion for the composition to the waste pile
Implementation Method 2
The invention also provides a liquid content that provides flexibility to the composition
Implementation Method 3
about 1 to about 50 weight percent of cement and/or fly ash
Data Source
AI summary
A cover composition comprises at least about 50 weight percent water, about 1 to about 50 weight percent of cement and/or fly ash, at least some fiber, at least some water dispersible polymer, and at least some acid, the cover composition being free of foaming agent. The acid is present in an amount sufficient to maintain the pH of the bulk material cover composition between about 1.0 and about 6.0. Also provided is a composition consisting essentially of about 70 to about 80 weight percent cellulosic water dispersible polymer, about 15 to about 30 weight percent fiber, and about 0.1 to about 5 weight percent acid, wherein the acid maintains the pH of the composition between about 1.0 and about 6.0.