Ceramic Membrane Direct Contact with Activated Carbon
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Solution Overview
Problem
Conventional waste treatment systems face inefficiencies and increased costs due to limitations in suspended solids concentration in membrane filtration, leading to high transmembrane pressure and potential membrane damage when using activated carbon and biological material, which necessitates additional separation steps and larger system footprints.
Innovation Solution
The use of ceramic or polytetrafluoroethylene membranes capable of withstanding high suspended solids concentrations, combined with optimized ratios of powdered activated carbon to biomass, allows for efficient removal of organic contaminants and solids without membrane fouling, enabling higher suspended solids concentrations up to 40 g/L in membrane filtration systems.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If suspended solids concentration is increased to improve treatment efficiency, then organic contaminant removal efficiency is improved, but transmembrane pressure increases and membrane damage occurs
Solution Approach 1:
The patent changes the material parameter of the membrane from conventional polymers to ceramic or PTFE membranes, which have fundamentally different physical and chemical properties including higher mechanical strength, chemical inertness, and resistance to fouling. This material parameter change enables the system to withstand high suspended solids concentrations (up to 40 g/L) without membrane damage or excessive fouling, thus resolving the contradiction between treatment efficiency and membrane reliability
Solution Approach 2:
The patent uses composite approaches by combining ceramic membranes with activated carbon and biological materials in a membrane bioreactor system. The ceramic membrane provides structural integrity and fouling resistance, while the activated carbon and biomass provide contaminant removal. This composite material strategy allows high suspended solids concentration operation without compromising membrane durability
2Productivity
If activated carbon and biological material are combined to improve organic contaminant removal, then treatment effectiveness is improved, but transmembrane pressure rises rapidly due to biological material consistency
Solution Approach 1:
The patent changes the membrane material parameter to ceramic or PTFE, which have smooth surfaces and hydrophobic properties that resist biological fouling. This material change prevents the rapid TMP rise that occurs with conventional membranes when biological material is present, allowing the combined activated carbon-biomass system to operate effectively without excessive pressure buildup
Solution Approach 2:
The patent treats the biological material as a consumable component that can be easily replaced or regenerated. The robust ceramic membrane can withstand the harsh conditions and high solids concentrations generated by biological activity, allowing the system to operate with high biomass concentrations without concern for membrane degradation
3Reliability
If gravity separation step is added to prevent carbon contact with membranes, then membrane damage is prevented, but system complexity and footprint increase
Solution Approach 1:
The patent extracts and eliminates the gravity separation step from the conventional treatment train by using a membrane material (ceramic or PTFE) that is inherently resistant to carbon contact damage. The membrane itself is designed to withstand direct contact with activated carbon and high solids concentrations, removing the need for preliminary separation steps and simplifying the overall system structure
Solution Approach 2:
The patent integrates multiple functions into a single membrane bioreactor unit, combining contaminant removal, solids separation, and membrane filtration in one integrated system. The robust membrane allows direct contact with all solids including activated carbon, eliminating the need for separate clarification or separation stages
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 enables stable operation with reduced membrane fouling and pressure issues, increasing treatment efficiency, reducing maintenance and costs, and allowing for higher solids concentrations without membrane damage, thereby improving the overall performance and efficiency of waste treatment systems.
Implementation Method 1
directing a first effluent from the vessel to a membrane unit in fluid communication with the vessel to remove solids from the first effluent
Implementation Method 2
contacting a high suspended solids liquor comprising at least a waste stream and powdered activated carbon therein
Data Source
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AI summary
The present invention enables a high suspended solids (SS) liquor (16) (at least about 10 g/L) comprising activated carbon (30) to be contacted with one or more membranes (14) of a membrane unit (12) to efficiently treat a waste stream (24) for contaminant removal.