Nanoflotation Membrane System for Fouling Reduction
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Solution Overview
Problem
Membrane fouling and maintenance remain significant challenges in submerged membrane systems used for water and wastewater treatment, with existing methods failing to effectively manage hydraulic flux and solid separation efficiently.
Innovation Solution
The use of coarse, large-diameter submerged membranes precoated with nano particles and froth flotation systems, combined with optimized membrane spacing and hydraulic design, to enhance flux rates and maintenance by facilitating the removal of solids and extending membrane cycle time.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional submerged membranes are used for solid separation, then membrane fouling occurs and maintenance frequency increases, but if air flotation systems are used, then solid separation efficiency improves but system complexity increases
Solution Approach 1:
The invention merges submerged membrane filtration with air flotation technology into a single integrated system. The membrane modules are positioned within the flotation tank, combining the solid separation functions of both technologies. This allows the system to benefit from both membrane precision and flotation effectiveness while reducing overall system complexity compared to separate systems.
Solution Approach 2:
The integrated system performs multiple functions simultaneously: the membranes provide fine filtration while the air flotation process handles bulk solid removal and membrane surface cleaning. The system can operate in different modes (filtration, backwashing, precoating) within the same tank structure, making the equipment highly versatile and reducing the need for separate treatment units.
2Productivity
If small pore, small diameter submerged membranes are used, then flux rates decrease and maintenance needs increase, but if coarse membranes are used, then flux rates improve but nano particle removal efficiency decreases
Solution Approach 1:
The invention uses air bubbles as an intermediary mechanism to achieve fine particle removal without relying solely on small pore membranes. The bubbles attach to particles and float them to the surface for removal, enabling effective nano particle separation while using coarse membranes that maintain high flux rates. This intermediary flotation process compensates for the larger membrane pore sizes.
Solution Approach 2:
The system dynamically changes operational parameters including switching between filtration mode (using membrane pores), backwashing mode (using air and water flow to clean membranes), and precoating mode (adding fine particles to membrane surfaces). These parameter changes allow the same coarse membrane system to achieve both high flux and effective particle removal at different operational stages.
3Reliability
If membranes are frequently removed for cleaning, then membrane surface maintenance improves, but operational time and productivity decrease
Solution Approach 1:
The system incorporates automatic backwashing capability where air and water are introduced to clean the membrane surfaces in place within the flotation tank. This self-cleaning function eliminates the need to remove membranes for manual cleaning, allowing continuous operation. The precoating process also serves to protect membrane surfaces and extend operational intervals between intensive cleaning cycles.
4Productivity
If membrane spacing is reduced to increase filtration area, then treatment capacity improves but hydraulic velocity vectors are compromised and flotation effectiveness decreases
Solution Approach 1:
The invention transitions from two-dimensional membrane arrangement to three-dimensional configuration within the flotation tank. Membrane modules are positioned vertically and spaced to allow hydraulic flow patterns in multiple dimensions. This 3D arrangement maintains adequate spacing for proper hydraulic velocity vectors and flotation effectiveness while maximizing the total filtration surface area through optimized spatial utilization.
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 improves hydraulic flux, reduces maintenance needs, and effectively removes nano particles, allowing for efficient solid separation and extended membrane operation by utilizing froth flotation to float solids and gravity to settle them, while enabling backwashing without membrane removal.
Implementation Method 1
a pressure differential draws the precoat media to a surface of the membrane screen; wherein the liquid is drawn through the membrane screen and through the precoat media on the surface thereof by the pressure differential
Implementation Method 2
the use of froth flotation systems, combined with optimized membrane spacing and hydraulic design, to enhance flux rates and maintenance by facilitating the removal of solids
Implementation Method 3
utilizing froth flotation to float solids and gravity to settle them
Data Source
AI summary
A nanoflotation system used to separate suspended solids or large settling or floating solids from water, waste water or liquids. This is accomplished through the use of submerged membranes, in combination with a number of design components comprising froth flotation, gravity settling, pre coating of the submerged membranes, spacing, of the membranes to facilitate flotation of solids to the surface or to the bottom of the containment chamber holding the submerged membranes, and membrane structures which use large diameter hollow fiber or tubular membranes and/or large pore opening membrane materials.