Phosphogypsum Microbial Slope Protection Against Rain Erosion
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Solution Overview
Problem
Conventional slope protection methods are costly, environmentally disruptive, and fail to harmoniously integrate with the surrounding landscape, while soil slopes are prone to rain erosion and landslide hazards due to weak resistance.
Innovation Solution
A method involving the use of phosphogypsum and Bacillus pasteurii microbes, where a microbial solution and cementing solution are mixed with phosphogypsum and soil to create a slurry that is sprayed onto the slope, combined with a three-dimensional vegetation net and drainage systems to enhance erosion resistance and promote plant growth.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional slope protection methods (arched slope protection, grid beam slope protection, mortar rubble slope protection) are used, then slope protection is achieved, but the cost is high and the design is inharmonious with the surrounding landscape
Solution Approach 1:
The patent converts phosphogypsum, a harmful waste product from phosphoric acid production that causes environmental pollution and requires costly disposal, into a beneficial construction material for slope protection. The phosphogypsum is mixed with soil, microbial solution, and cementing solution to create an improving mixture slurry that stabilizes slopes while simultaneously reducing waste disposal costs and environmental harm.
Solution Approach 2:
The patent changes the physical and chemical parameters of the slope surface by applying the improving mixture slurry containing phosphogypsum, microbes, and binding agents. This transforms the loose, erosion-prone soil into a stabilized, cohesive structure with improved mechanical properties and erosion resistance, achieving protection without conventional expensive structures.
2Stability of the object's composition
If conventional gray protection methods are used, then slope stability is improved, but the design is inharmonious with the surrounding landscape and causes secondary collapse
Solution Approach 1:
The patent employs functional microbes (Bacillus pasteurii, Aspergillus niger, Penicillium expansum) that naturally cement soil particles together and promote plant growth. These microbes self-organize to form bio-cemented structures that stabilize the slope and enhance vegetation, creating a self-reinforcing system that harmonizes with the natural environment rather than imposing artificial structures.
Solution Approach 2:
The patent creates a composite material system combining phosphogypsum, soil, microbial solution, and cementing solution (urea and calcium chloride). This composite mixture integrates the stabilizing properties of phosphogypsum, the binding capability of microbes, and the cementing action of urea-calcium chloride, resulting in a multi-functional material that provides both structural stability and environmental harmony.
3Ease of manufacture
If phosphogypsum is disposed of conventionally, then waste management is simplified, but land resources are occupied and phosphogypsum dams may collapse
Solution Approach 1:
The patent assigns multiple functions to phosphogypsum: it serves as both a construction material for slope protection and a waste disposal solution. The phosphogypsum provides structural stabilization for slopes while simultaneously eliminating the need for separate waste management infrastructure, converting a single material into a multi-functional solution that addresses both engineering and environmental challenges.
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 reduces rain erosion, minimizes phosphogypsum waste, and integrates with the ecological environment, offering a cost-effective and sustainable solution for slope protection.
Implementation Method 1
functional microbes can be selected and cultured for slope protection, which can cement soil particles, resist rain erosion
Implementation Method 2
mixing a mixture, the microbial solution and water well, and adding the cementing solution and water to prepare an improving mixture slurry
Data Source
AI summary
The present invention provides a method for protecting a soil slope from rain erosion by improving with phosphogypsum and a microbe. The method includes: (1) placing Bacillus pasteurii in a culture medium to prepare a microbial solution, and mixing urea, calcium chloride and water to prepare a cementing solution; (2) mixing a mixture, the microbial solution and water well, and adding the cementing solution and water to prepare an improving mixture slurry; and (3) spraying the improving mixture slurry to a face of the slope twice by wet spraying, mixing the improving mixture slurry with grass seeds well, spraying to the face of the slope once, covering with a non-woven fabric by tying and fixing to the slope, and watering every day.