Sludge Dehydration Using Crosslinked Polymer Intrinsic Viscosity
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Solution Overview
Problem
Conventional sludge dehydration methods face inefficiencies due to small floc size and complexity in balancing chemical additions, with crosslinked polymers requiring larger amounts for coagulation, leading to inferior coagulating effects.
Innovation Solution
A sludge dehydration method using a crosslinked polymer with specific intrinsic viscosity, which forms strong, dense flocs and enhances gravity filtration properties even with a small amount added, by utilizing a polymer composition with 30 to 95 mol% cationic monomers and nonionic monomers, and optionally including powder acids or salts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If a crosslinked polymer is used for sludge coagulation, then the polymer forms dense molecular structure, but the extension of the molecule in water is suppressed leading to larger amounts needed for coagulation
Solution Approach 1:
The patent changes the parameter of intrinsic viscosity to a specific range (0.5 to 5.0 dL/g) to optimize the balance between molecular density and water extension. This parameter control allows the crosslinked polymer to achieve effective coagulation with smaller dosages while maintaining stable molecular structure.
Solution Approach 2:
The patent uses a composite polymer system comprising crosslinked polymers combined with other polymer components. This composite approach leverages the dense structure of crosslinked polymers while incorporating elements that enhance water extension and coagulating effect, reducing the overall dosage required.
2Productivity
If conventional cationic polymer coagulants are used, then the dehydration treatment can be performed, but the floc size formed is small and dehydrating effects are insufficient
Solution Approach 1:
The patent optimizes the intrinsic viscosity parameter of the crosslinked polymer to fall within 0.5 to 5.0 dL/g, which fundamentally changes the polymer's behavior in water. This parameter optimization enables the formation of larger flocs with improved gravity filtration properties while maintaining high dehydration efficiency.
Solution Approach 2:
The patent introduces dynamic control of polymer conformation in water through the intrinsic viscosity specification. The crosslinked polymer dynamically adjusts its extension state in aqueous solution, optimizing its interaction with sludge particles to form larger, more effective flocs compared to conventional static polymer structures.
3Reliability
If the amount of crosslinked polymer is increased to improve coagulation, then coagulating effect may improve, but the molecular extension is further suppressed and efficiency decreases
Solution Approach 1:
The patent establishes an optimal parameter range for intrinsic viscosity (0.5 to 5.0 dL/g) that maximizes coagulating effect while minimizing the dosage required. This parameter optimization ensures that the polymer achieves reliable coagulation at lower concentrations, maintaining high dehydration efficiency without excessive polymer addition.
Solution Approach 2:
The patent creates an optimized version of the crosslinked polymer with specific intrinsic viscosity characteristics that replicates and enhances the coagulating effects of higher dosages of conventional polymers. This optimized polymer structure acts as an improved copy that achieves the same or better coagulating effect with reduced dosage.
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 method achieves excellent floc formation and gravity filtration properties with reduced polymer usage, improving dehydration efficiency and operability while minimizing costs.
Implementation Method 1
a crosslinked polymer wherein a monomer composition of polymer constitutional units comprises 30 to 95 mol% of a cationic monomer... excellent floc formation ability... with reduced polymer usage
Implementation Method 2
enhances gravity filtration properties... excellent floc formation and gravity filtration properties
Data Source
AI summary
The present invention provides a sludge dehydrating agent having excellent dehydrating effects, particularly, an excellent floc formation ability and gravity filtration property even if the amount to be added is small and a sludge dehydrating method using the sludge dehydrating agent. The sludge dehydrating agent comprises at least one crosslinked polymer selected from the group consisting of a polymer A, a polymer B, and a polymer C each comprising a monomer represented by a particular structural formula, wherein the crosslinked polymer has an intrinsic viscosity of 0.5 to 5.0 dL/g, the intrinsic viscosity measured with 1.0N sodium nitrate, and the sludge dehydrating method uses the sludge dehydrating agent.