Stabilized Chlorite-Cyclodextrin Composition for Sludge Dewatering
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Solution Overview
Problem
Existing compositions fail to provide a single feed solution that effectively addresses both odor control and enhanced dewatering while maintaining storage stability, leading to inefficiencies in sludge and pulp dewatering processes.
Innovation Solution
A composition comprising a mixture of chlorite salt, cyclodextrin, and an alkaline base dissolved in water, with specific ratios and pH levels, which enhances odor control and dewatering by producing a drier cake and reducing polymer usage, while maintaining stability against chlorine dioxide formation and cyclodextrin degradation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a single feed composition is used to provide both odor control and enhanced dewatering, then operational efficiency is improved, but storage stability deteriorates due to instability of the composition
Solution Approach 1:
The patent changes the pH parameter to at least 12.5 and controls the concentration ratios of cyclodextrin (0.13 to 13 parts by mass per 50 parts by mass of chlorite anion) and alkaline base (up to 13 parts by mass per 50 parts by mass of chlorite anion). These parameter changes stabilize the composition during storage while maintaining its dual functionality for odor control and dewatering enhancement.
Solution Approach 2:
The patent creates a composite composition by combining chlorite salt, cyclodextrin, and alkaline base in specific ratios. This composite material provides both odor control (from chlorite) and dewatering enhancement (from cyclodextrin) while the alkaline base stabilizes the mixture, preventing premature reaction and maintaining storage stability.
2Productivity
If cyclodextrin is added to chlorite solution to enhance dewatering, then dewatering performance is improved, but storage stability worsens due to potential degradation and chlorine dioxide formation
Solution Approach 1:
The patent maintains pH at least 12.5 through the addition of alkaline base, which stabilizes the cyclodextrin-chlorite mixture during storage. This high pH condition prevents cyclodextrin degradation and suppresses chlorine dioxide formation, allowing the composition to retain its dewatering enhancement capability while achieving storage stability.
Solution Approach 2:
The alkaline base acts as an intermediary that mediates between the cyclodextrin and chlorite salt. It maintains the necessary high pH environment that prevents harmful reactions while allowing both components to coexist stably in the single feed composition, enabling both dewatering enhancement and storage stability.
3Stability of the object's composition
If multiple separate compositions are used for odor control and dewatering, then storage stability is maintained, but process complexity and cost increase
Solution Approach 1:
The patent merges odor control (chlorite salt function) and dewatering enhancement (cyclodextrin function) into a single feed composition. By combining these previously separate treatments into one stable composition, the patent simplifies the treatment process while maintaining storage stability through controlled pH and component ratios.
Solution Approach 2:
The single feed composition achieves multi-functionality by providing both odor control and dewatering enhancement in one product. The chlorite salt component addresses odor control while the cyclodextrin component enhances dewatering, and the alkaline base ensures stability, allowing one composition to perform multiple functions that previously required separate treatments.
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 solution achieves superior storage stability, enabling effective odor control and enhanced dewatering, reducing the need for additional polymers and energy consumption, and maintaining cyclodextrin content during storage, thus optimizing belt press efficiency and reducing waste handling costs.
Implementation Method 1
wherein the composition has a pH of at least 12.5
Implementation Method 2
Sodium chlorite solutions can be used to selectively oxidize sulfide and other malodorous compounds
Implementation Method 3
Compositions containing cyclodextrins have been applied to biological sludge to enhance the dewatering process
Data Source
AI summary
A composition comprising a compound mixture dissolved in water, the compound mixture comprising at least one chlorite salt at least one cyclodextrin; and at least one alkaline base; provided that the cyclodextrin is in an amount of 0.13 to 13 parts by mass for every 50 parts by mass of chlorite anion ClO2−, and the alkaline base is in an amount of up to 13 parts by mass for every 50 parts by mass of chlorite anion ClO2−; wherein the composition has a pH of at least 12.5. A process for forming the composition and process for treating suspensions of particles with the composition are also disclosed.