Sheet Laminate for Wastewater Aeration with Composite Structure
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Solution Overview
Problem
Existing wastewater treatment membranes face challenges with maintaining strength against water pressure and waterproofing while ensuring air permeability, as well as long-term hydrophilicity issues leading to compromised purification performance.
Innovation Solution
A sheet laminate comprising a microporous membrane base material, a gas-permeable non-porous layer, and a microbial support layer, laminated in a specific order to enhance adhesion and oxygen supply, with the gas-permeable non-porous layer having adhesiveness and a microbial adhesion index of 0.08 or more, ensuring effective oxygen permeation and microbial adhesion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If a gas-permeable membrane is formed only of silicone resin, then air permeability is improved, but strength to withstand water pressure deteriorates
Solution Approach 1:
The patent uses a composite structure consisting of a silicone resin layer (for air permeability) and a porous support layer (for strength). The silicone resin layer is formed on the surface of the porous support layer, combining the gas permeability of silicone with the mechanical strength of the support layer to resolve the contradiction between air permeability and water pressure resistance.
2Strength
If the surface of fabric is coated with silicone resin, then strength to withstand water pressure is improved, but waterproofing deteriorates due to defects from fabric unevenness
Solution Approach 1:
The patent employs a porous support layer as the base structure instead of fabric. This porous material provides a uniform surface for silicone resin coating while maintaining sufficient mechanical strength. The porous structure allows controlled gas permeability without the defects caused by fabric unevenness, ensuring reliable waterproofing.
3Reliability
If the resin coating film is thickened to maintain waterproofing, then waterproofing is improved, but air permeability deteriorates
Solution Approach 1:
The patent creates different functional zones in the membrane structure: the porous support layer provides mechanical strength and structural integrity, while the thin silicone resin layer on the surface provides waterproofing. This local differentiation allows the membrane to achieve both waterproofing and air permeability without requiring a thick resin coating.
4Use of energy by moving object
If a single-layer microporous membrane is used, then air permeability is improved, but waterproofing deteriorates due to hydrophilicity with long-term use
Solution Approach 1:
The patent combines a porous support layer with a silicone resin coating layer to create a composite membrane. The porous support layer maintains air permeability through its controlled pore structure, while the silicone resin coating provides long-term waterproofing by forming a hydrophobic barrier that prevents water penetration even after extended use.
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 sheet laminate maintains purification performance by preventing hydrophilicity and ensuring long-term waterproofing, while providing sufficient oxygen supply to microorganisms for effective wastewater treatment.
Implementation Method 1
a gas-permeable non-porous layer... sufficient oxygen supply to microorganisms for effective wastewater treatment
Implementation Method 2
a base material; and a gas-permeable non-porous layer, the base material being a microporous membrane
Implementation Method 3
a microbial support layer... the microbial adhesion index MA of 0.08 or more
Data Source
AI summary
A gas supply body for use in a wastewater treatment apparatus for purifying wastewater using action of microorganisms in the wastewater, the gas supply body comprising: a gas delivery layer and a sheet laminate, wherein the sheet laminate comprises a base material that is a microporous membrane comprising a plurality of fine through holes penetrating therethrough in a thickness direction, and a gas-permeable non-porous layer, wherein the gas delivery layer, the base material, and the gas-permeable non-porous layer are arranged in this order, and wherein the base material has a pore size of 0.01 μm to 50 μm. A method for producing a bag for a gas supply body disposed in a wastewater treatment apparatus comprising a sheet laminate.