Filter Membrane Cleaning Using Sequential Oxidizing Agents
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Solution Overview
Problem
Conventional methods for cleaning filter membranes are inadequate in restoring filtration performance due to limited effectiveness in removing pollutants adhered to the surface and interior of the membrane, leading to rapid decreases in membrane filtration flux and efficiency, and require excessive amounts of oxidizing agents and water.
Innovation Solution
A method involving the use of at least two types of cleaning water with different oxidizing agents, applied in ascending order of oxidizability, to efficiently remove pollutants from the surface and pores of the filter membrane, reducing the need for large quantities of oxidizing agents and water.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If conventional backflow cleaning using single oxidizing agent is used, then cleaning process is simple, but filtration performance cannot be sufficiently recovered due to limited effect in removing polluting substances
Solution Approach 1:
The cleaning process is divided into multiple sequential stages, each using a different oxidizing agent with specific properties. The first stage uses a mild oxidizing agent for surface cleaning, while the second stage uses a strong oxidizing agent for deep pore cleaning, thereby resolving the contradiction between process simplicity and cleaning effectiveness.
Solution Approach 2:
The invention changes the chemical parameters of the cleaning solution by using different oxidizing agents with varying oxidation potentials at different cleaning stages. This parameter variation enables effective removal of different types of polluting substances from different locations on the membrane, improving filtration performance recovery.
2Reliability
If large amounts of oxidizing agents and water are used for cleaning, then polluting substances can be removed, but water and chemical consumption increases
Solution Approach 1:
The invention applies different cleaning solutions with appropriate oxidizing agents to different locations and depths of the membrane structure. Mild agents are used for surface cleaning where less chemical is needed, while strong agents are targeted at pore interiors where polluting substances are most tenaciously adhered, optimizing chemical usage efficiency.
Solution Approach 2:
The multi-stage cleaning process uses oxidizing agents in optimized quantities and concentrations appropriate for each cleaning stage, avoiding the excessive use of strong chemicals that would be required if only a single aggressive cleaning step were used. This partial action approach achieves effective cleaning with reduced overall chemical 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
This approach effectively maintains filtration performance over a longer period by efficiently removing pollutants from both the surface and interior of the filter membrane, while minimizing the use of oxidizing agents and water.
Implementation Method 1
a method for backflow cleaning using cleaning water containing an oxidizing agent such as sodium hypochlorite and ozone, in which the polluting substances that are chemically adhered with intermolecular forces to the surface of a filter membrane or into the pores of the membrane contacting with filtered water are oxidatively degraded and removed
Implementation Method 2
contacting hydrogen peroxide with ozone within a filter membrane, generating a radical such as a hydroxyl radical with oxidizability higher than that of ozone, to thus remove polluting substances adhered to the surface of the filter membrane that comes into contact with water to be treated, the surface of the filter membrane or into the pores of the membrane that comes into contact with filtered water via oxidative degradation
Data Source
AI summary
A method for cleaning a filter membrane in which at least 2 types of cleaning water containing oxidizing agents are prepared, and the filter membrane is cleaned using the cleaning water in an ascending order of the oxidizabilities of the oxidizing agents. Moreover, an apparatus for cleaning a filter membrane of the present invention comprises a means for cleaning the filter membrane using at least 2 types of cleaning water containing oxidizing agents, and the filter membrane is cleaned using the cleaning water in an ascending order of the oxidizabilities of the oxidizing agents. The method and the apparatus for cleaning a filter membrane can efficiently remove polluting substances adhered to a filter membrane while reducing the amounts of oxidizing agents and water to be used, and can maintain the filtration performance for a long period of time.