Saline Sludge Drying Composition With SAP-Flocculant Blend
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Solution Overview
Problem
Existing methods for drying saline sludges, particularly those with high salt concentrations, are inefficient and costly due to the reduced absorption capacity of superabsorbent polymers in the presence of salts, necessitating excessive additive use.
Innovation Solution
A composition comprising at least 50% to 99% superabsorbent polymer and 1% to 50% flocculant polymer, added as a dry mixture, effectively dries saline sludges by enhancing absorption and reducing the required superabsorbent dosage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If superabsorbent polymer is used to dry saline sludge, then absorption capacity is reduced due to high salt concentration, but increasing superabsorbent dosage increases cost and volume
Solution Approach 1:
The invention combines superabsorbent polymer and flocculant polymer into a composite drying composition. The flocculant polymer aggregates suspended particles and facilitates water release to the superabsorbent polymer, while the superabsorbent polymer absorbs the released water. This composite approach overcomes the salt-induced absorption capacity reduction by using the flocculant to enhance the overall drying mechanism, allowing effective sludge drying at lower dosages of superabsorbent polymer.
2Reliability
If chemical conditioning with lime and carbonates is used to dry sludge, then dryness is improved, but volume and transportation cost increase significantly
Solution Approach 1:
The invention changes the chemical composition parameters of the drying agent by using organic polymers (superabsorbent and flocculant) instead of traditional inorganic chemicals (lime, carbonates). This parameter change enables achieving the same dryness effect with minimal volume increase, as the polymers work through absorption and flocculation mechanisms rather than chemical precipitation that generates large volumes of solid residue.
3Reliability
If thermal conditioning is used to dry saline sludge, then energy consumption increases, but drying effectiveness is maintained
Solution Approach 1:
The invention replaces the thermal energy-based drying system with a chemical/mechanical system using polymer absorption and flocculation. Instead of using heat to evaporate water from the sludge, the superabsorbent polymer chemically binds and physically traps water molecules, while the flocculant polymer mechanically aggregates particles to facilitate water release. This substitution eliminates the need for continuous energy input required by thermal drying methods.
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 composition rapidly and efficiently transforms saline sludges into transportable and storable form, overcoming the limitations of prior art by minimizing superabsorbent polymer usage and maintaining effectiveness despite high salt content.
Implementation Method 1
a drying composition in powder form to allow optimum conditioning of saline sludges... made up of: at least 50% and up to 99% by weight of a superabsorbent polymer powder... and from 1% to 50% by weight of a flocculant polymer powder
Implementation Method 2
The presence of flocculant polymer in the composition quite surprisingly makes it possible to very significantly reduce the quantity of superabsorbent polymer necessary to obtain a shovelable and therefore transportable sludge
Data Source
AI summary
The present invention relates to the technical field of treating urban and industrial saline sludges in general and more specifically the “conditioning” thereof before it is removed through the appropriate channels. The drying composition of the invention makes it possible to easily transport and store saline sludges, namely all sludges comprising even small quantities of salts made up of inorganic anions, in particular chlorides, and cations such as sodium, potassium, calcium and magnesium. Said drying composition is characterized in that it comprises: —at least 50% and up to 99% by weight of a superabsorbent polymer—and from 1% to 99% by weight of a flocculant polymer. It makes it possible to dry saline sludges by significantly reducing the quantity of superabsorbent required to achieve said outcome. The invention also relates to the use of the composition for conditioning saline sludges.