Inorganic Solid Waste-Microbial Composite Curing Agent for Sludge
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Solution Overview
Problem
Traditional curing agents for construction waste sludge, such as cement, face issues of high energy consumption, environmental pollution, and low curing efficiency, while microbial agents have limited strength and stability due to environmental sensitivity.
Innovation Solution
An inorganic solid waste-microbial composite curing agent comprising steel slag, activated magnesium oxide, recycled powder, foaming agent, foam stabilizer, and encapsulated carbonic anhydrase bacteria and Bacillus subtilis microcapsules, which are combined with soluble calcium salts and processed to create a porous material that absorbs CO2 for solidification.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If cement is used as a sludge curing agent, then the strength of solidified sludge is improved, but energy consumption and environmental pollution increase significantly
Solution Approach 1:
The patent changes the chemical composition parameters by replacing cement with industrial solid waste materials (steel slag, activated magnesium oxide, recycled powder) and introduces microbial agents (carbonic anhydrase bacteria, Bacillus subtilis) to alter the curing mechanism from purely chemical hydration to a combined biochemical process, thereby reducing energy consumption while maintaining strength
Solution Approach 2:
The patent creates a composite curing system combining inorganic solid waste materials with microbial agents. The steel slag, activated magnesium oxide, and recycled powder form an inorganic matrix that provides structural strength, while the encapsulated microorganisms contribute to carbonation and binding, achieving synergistic effects that reduce reliance on energy-intensive cement
2Strength
If cement content is increased to improve sludge strength, then the strength of solidified sludge is improved, but pH value of leaching solution increases causing environmental harm
Solution Approach 1:
The patent replaces expensive, long-lasting cement with industrial solid waste materials that are cheaper and environmentally benign. The steel slag, activated magnesium oxide, and recycled powder serve as short-term curing agents that achieve sufficient strength without generating harmful long-term leaching, thereby eliminating the need to balance strength with pH control
Solution Approach 2:
The patent converts industrial solid waste (steel slag, recycled powder) which would otherwise be environmental pollutants into beneficial curing materials. These materials provide both strength development and pH buffering capacity, transforming potential harmful substances into environmentally friendly building materials that neutralize rather than generate acidity
3Use of energy by moving object
If microbial agents are used for sludge solidification, then energy consumption is reduced, but curing efficiency and strength are lower due to environmental sensitivity
Solution Approach 1:
The patent applies preliminary action by pre-encapsulating the microorganisms in protective microcapsules before application. This pre-protection ensures the microorganisms survive the mixing and curing process, maintaining their metabolic activity and carbonation function throughout the curing period, thereby ensuring consistent curing efficiency without requiring excessive energy input
Solution Approach 2:
The patent creates a composite system where the inorganic solid waste materials provide immediate structural framework and strength, while the encapsulated microorganisms provide progressive carbonation and binding. This dual-mechanism approach ensures both rapid initial strength development and continued strength gain over time, achieving high curing efficiency with low energy consumption
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 composite curing agent enhances the strength and stability of solidified sludge, reduces energy consumption and emissions, and effectively decomposes organic pollutants, offering a sustainable and efficient solution for sludge solidification.
Implementation Method 1
the use of microbial mineralization to reinforce soil can improve its strength and stiffness
Implementation Method 2
which are combined with soluble calcium salts and processed to create a porous material that absorbs CO2 for solidification
Implementation Method 3
20-30 parts of steel slag, 30-40 parts of activated magnesium oxide, 20-30 parts of recycled powder, 5-10 parts of foaming agent, 1-5 parts of foam stabilizer
Data Source
AI summary
Provided is an inorganic solid waste-microbial composite curing agent and its preparation method and application. The inorganic solid waste-microbial composite curing agent consists of the following raw materials in parts by weight: steel slag, active magnesium oxide, recycled powder, stearic acid, borax, carbonic anhydrase bacteria, Bacillus subtilis, and soluble calcium salts. The preparation method includes performing granulation on steel slag, active magnesium oxide, recycled powder, stearic acid, borax, etc. into porous materials through dry rolling extrusion and compression, and loading carbonic anhydrase bacteria and Bacillus subtilis into the porous materials. By adding inorganic solid waste-microbial composite curing agent into the sludge and introducing CO2, the sludge is quickly solidified through the carbonization and microbial mineralization of inorganic solid waste. At the same time, microorganisms can effectively decompose organic pollutants in the sludge, achieving the goal of harmless, stabilized and resourceful utilization of sludge.