Sludge Cementing via Dry Mixture for Waste Inerting
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current methods for inerting industrial and radioactive waste in the form of sludge face challenges due to their rheological properties and chemical reactivity, leading to difficulties in mixing and solidification, which results in suboptimal mechanical resistance and increased porosity.
Innovation Solution
A semi-homogeneous cementing process is developed, where waste is solidified with a dry cementitious mixture without additional water, allowing for the extemporaneous preparation of cement from waste water, thereby stabilizing and solidifying sludges that are difficult to mix conventionally, and maximizing the incorporation rate of dry matter into a cement matrix.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a high Water/Cement ratio is used to ensure workability and consistency of sludge suspension, then the rheological behavior is improved, but porosity increases and mechanical resistance decreases
Solution Approach 1:
The patent changes the Water/Cement ratio parameter from high (conventional) to low (optimized), achieving both workability and mechanical resistance by using a controlled amount of water that enables mixing without creating excessive porosity
Solution Approach 2:
The patent creates a composite material system combining sludge suspension with cement, where the interaction between the two components produces a optimized rheological behavior and mechanical properties that neither material alone could achieve
2Ease of manufacture
If additional water is added to ensure suitable rheology of the paste, then the mixing process is improved, but the incorporation rate of waste decreases
Solution Approach 1:
The sludge suspension serves its own rheological needs by using its intrinsic water content, eliminating the need for external water addition and thereby maximizing waste incorporation without requiring additional liquid
3Device complexity
If conventional cementing methods are used with sludge, then the process is simple, but the mixing quality and homogeneity are insufficient
Solution Approach 1:
The patent performs preliminary classification and separation of sludge components before cementing, preparing the sludge in advance to ensure optimal mixing quality and homogeneity while maintaining process simplicity
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 process achieves stable and homogeneous composite materials with enhanced mechanical resistance and reduced hydrogen content, minimizing water usage and preventing re-dissolution of sludge, thus effectively inerting waste while limiting radionuclide release.
Implementation Method 1
a step consisting of bringing said waste in the form of sludge into contact with a dry cementitious mixture
Implementation Method 2
trapping mineral and organic pollutants by precipitation in the form of insoluble compounds
Implementation Method 3
trapping mineral and organic pollutants by precipitation in the form of insoluble compounds
Implementation Method 4
effectively inerting waste while limiting radionuclide release
Data Source
Figure 1A~1B
Figure 2~3
Figure 4~5
AI summary
The present invention relates to a method for preparing a composite material from waste in the form of sludge, including a step of place said waste in the form of sludge in contact with a dry cement mixture. The present invention also relates to the resulting composite material and to the use of such a method for processing waste and/or rendering waste inert, in particular industrial and/or radioactive waste.