Seawater Filter Cleaning with Iron-Hydrogen Peroxide
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Solution Overview
Problem
The existing methods for cleaning filters used in seawater desalination, particularly those involving hydroxy dicarboxylic acid, hydrogen peroxide, and heavy metal compounds, are ineffective in removing inorganic matter and heavy metals from filter deposits, leading to impaired cleaning efficiency when using filtered seawater not subjected to reverse osmosis as a dilution solvent.
Innovation Solution
A filter cleaning method that incorporates an iron compound with a concentration of at least 1.50 mmol/L in a cleaning solution prepared with hydrogen peroxide and optionally hydroxy dicarboxylic acid, using filtered seawater that has not undergone reverse osmosis, to effectively remove inorganic and organic matter from filter deposits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If hydrogen peroxide and heavy metal compound are used as cleaning agent, then organic matter removal is improved, but inorganic matter and heavy metal adhesion to filter surface increases
Solution Approach 1:
Hydroxy dicarboxylic acid acts as an intermediary substance that facilitates the removal of inorganic matter and prevents heavy metal adhesion. It mediates between the hydrogen peroxide oxidation process and the filter surface, enabling simultaneous removal of both organic and inorganic contaminants without leaving harmful deposits.
Solution Approach 2:
The cleaning agent is formulated as a composite system combining hydrogen peroxide, heavy metal compound, and hydroxy dicarboxylic acid. This composite formulation synergistically removes both organic matter (through hydrogen peroxide oxidation) and inorganic matter (through hydroxy dicarboxylic acid chelation), while the heavy metal compound prevents re-adhesion to the filter surface.
2Reliability
If freshwater from reverse osmosis is used as dilution solvent, then cleaning effect is improved, but product yield is significantly impaired
Solution Approach 1:
The system uses filtered seawater (self-generated intermediate product) as the dilution solvent instead of requiring freshwater from reverse osmosis. This self-service approach allows the desalination process to serve its own cleaning needs, avoiding the loss of valuable freshwater product while maintaining effective cleaning capability.
Solution Approach 2:
The invention changes the parameter of dilution solvent from freshwater (reverse osmosis product) to filtered seawater (intermediate product). This parameter change enables the system to maintain high cleaning effectiveness while preserving product yield, as the cleaning action is achieved through the chemical properties of the cleaning agent rather than requiring pure water.
3Productivity
If filtered seawater not subjected to reverse osmosis is used as dilution solvent, then product yield is maintained, but cleaning effect is significantly reduced
Solution Approach 1:
Hydroxy dicarboxylic acid serves as a mediator that enables effective cleaning using filtered seawater as the dilution solvent. It compensates for the presence of salts and minerals in the seawater by providing chelation and complexation actions, allowing the cleaning agent to function effectively without requiring reverse osmosis-treated water.
Solution Approach 2:
The invention modifies the chemical parameters of the cleaning agent formulation to be compatible with filtered seawater. By adjusting the concentration and composition of cleaning agents (particularly incorporating hydroxy dicarboxylic acid), the system achieves effective cleaning while using filtered seawater as the dilution solvent, thereby maintaining product yield.
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 method stabilizes the cleaning process for seawater desalination filters, ensuring efficient removal of deposits and maintaining filter performance without significant impact on product yield, cost, or time.
Implementation Method 1
the hydroxy radical (HO·) generated by the reaction of hydrogen peroxide and a heavy metal ion derived from the heavy metal compound oxidatively decomposes and removes organic matter from the filter deposits
Implementation Method 2
the hydroxy radical (HO·) generated by the reaction of hydrogen peroxide and a heavy metal ion derived from the heavy metal compound oxidatively decomposes and removes organic matter from the filter deposits
Implementation Method 3
By incorporating a hydroxy dicarboxylic acid in the cleaning agent with hydrogen peroxide and the heavy metal compound, it is possible to clean and remove inorganic matter from the filter deposits
Data Source
AI summary
A method for washing a filter is used in a seawater desalination process including a first filtration step for subjecting seawater to microfiltration or ultrafiltration, and a second filtration step for subjecting seawater after the first filtration step to a reverse osmosis treatment. The filter is a microfiltration membrane or ultrafiltration membrane used in the first filtration step. An iron compound is added to seawater in any stage in the washing method. The washing method includes a washing chemical liquid preparation step for preparing washing chemical liquid, and a sticking matter removal step for removing matter sticking to the filter by bringing the filter into contact with washing chemical liquid. In the washing chemical liquid preparation step, seawater after the first filtration step is mixed with at least hydrogen peroxide to prepare washing chemical liquid having an iron compound concentration of 1.50 mmol/L or more in terms of iron atoms.