Composite Soil Isolation Layer for Contaminated Site Restoration
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Solution Overview
Problem
The existing soil barrier landfill restoration technology for contaminated sites is expensive and not cost-effective, especially for large areas with compound contaminated soil containing multiple heavy metals or organic and inorganic pollutants, making it difficult to promote widely.
Innovation Solution
A method involving flattening and compacting the contaminated site, laying an isolation layer composed of loess, slaked lime, fine sand, and a substance with adsorption function, followed by a pure soil layer and an arable soil layer, where the isolation layer blocks pollutant migration and the pure and arable layers facilitate water retention and fertilizer conservation for crop growth, reducing construction complexity and cost.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional soil barrier landfill technology (HDPE membrane, mud wall) is used to isolate contaminated soil, then the isolation effectiveness is improved, but the construction cost increases and construction complexity increases
Solution Approach 1:
The patent uses a composite isolation layer made of multiple materials (loess, slaked lime, fine sand, and adsorption substances) combined in specific proportions. This composite material approach achieves effective pollutant isolation while avoiding the need for expensive and complex HDPE membranes and mud walls, thereby reducing construction complexity while maintaining isolation effectiveness.
Solution Approach 2:
The patent changes the composition parameters of the isolation layer by using a specific mixture ratio of loess (50-70%), slaked lime (10-30%), fine sand (10-30%), and adsorption substances (5-20%). This parameter optimization allows the isolation layer to achieve effective pollutant blocking without requiring complex construction systems, thus reducing both cost and complexity while maintaining reliability.
2Reliability
If traditional soil barrier landfill technology is used for large area contaminated sites, then the isolation effectiveness is improved, but the construction cost increases significantly
Solution Approach 1:
The patent replaces expensive traditional barrier materials (HDPE membranes, mud walls) with cheaper local materials such as loess, slaked lime, and fine sand that can be easily obtained and applied. Although these materials are less durable than synthetic barriers, they provide sufficient isolation effectiveness for the application and significantly reduce construction cost, especially for large area treatments where cost efficiency is critical.
Solution Approach 2:
The patent optimizes the composition parameters of the isolation layer to achieve effective isolation at lower cost. By adjusting the proportions of loess (50-70%), slaked lime (10-30%), fine sand (10-30%), and adsorption substances (5-20%), the system achieves effective pollutant isolation without requiring expensive materials, making large area treatment economically viable while maintaining isolation effectiveness.
3Quantity of substance
If compound soil isolation layer is used instead of traditional barrier materials, then the construction cost is reduced, but the isolation effectiveness may be compromised
Solution Approach 1:
The patent creates a composite isolation layer combining loess (provides bulk and structure), slaked lime (provides alkalinity for heavy metal precipitation), fine sand (improves permeability and structure), and adsorption substances (enhances pollutant adsorption capacity). This multi-component composite material achieves isolation effectiveness comparable to traditional barriers while using cheaper, more sustainable materials.
Solution Approach 2:
The patent introduces adsorption substances as intermediary components that enhance the isolation effectiveness of the compound soil mixture. These substances act as mediators that actively adsorb heavy metals and organic pollutants, compensating for the lower inherent barrier properties of natural soils like loess and sand, thereby maintaining isolation effectiveness while reducing construction cost.
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 method effectively isolates pollutants, reduces construction costs, and ensures safe and economical restoration of contaminated sites by using readily available and low-cost materials, with a simple process that can be easily scaled for larger areas.
Implementation Method 1
block the migration and diffusion of pollutants in the soil by laying a barrier layer, so that the contaminated soil is isolated from the surrounding environment
Implementation Method 2
laying an isolation layer containing compound soil on the contaminated site; the compound soil is composed of loess, slaked lime, fine sand and a substance having an adsorption function
Data Source
AI summary
The present disclosure provides an isolation and restoration method for compound contaminated soil. The isolation and restoration method for the compound contaminated soil provided by the present disclosure is used for isolation and restoration of a contaminated site, which includes: laying an isolation layer, a pure soil layer and an arable soil layer containing compound soil in turn on the contaminated site which is flattened and compacted, where the compound soil is composed of loess, slaked lime, fine sand and substances having an adsorption function in a volume ratio.