Cross-Flow Distribution Media Lateral Dispersion
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Solution Overview
Problem
Existing cross-flow distribution media in wastewater treatment and cooling tower applications face inefficiencies in lateral distribution of fluids and gases, leading to suboptimal mixing, oxygen transfer, and biomass contact.
Innovation Solution
A cross-flow media block formed from two corrugated plastic film sheets with oppositely oriented diagonal ribs and a flat sheet member that traps and disperses fluids or gases into two laterally spaced streams, enhancing lateral distribution and oxygen transfer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If conventional structured sheet media is used, then the media provides basic flow distribution, but lateral distribution of fluids and gases remains inefficient
Solution Approach 1:
The media block is segmented into multiple layers with alternating flute orientations (first layer with flutes at first angle, second layer with flutes at second angle). This segmentation creates distinct flow paths that redirect fluids and gases laterally as they pass through each layer, improving distribution efficiency without compromising structural integrity
Solution Approach 2:
Different regions of the media block have different flute orientations to create localized flow redirection. The first layer directs flow in one lateral direction while the second layer directs flow in a different lateral direction, creating varied local flow patterns that enhance overall mixing and distribution throughout the media
2Area of stationary object
If water is dispersed above the media, then water can be distributed throughout the media block, but lateral distribution with respect to media orientation remains insufficient
Solution Approach 1:
The invention transitions from simple vertical flow distribution to multi-dimensional distribution by incorporating lateral flow redirection through alternating flute orientations. Fluids and gases are redirected not only vertically through the media layers but also laterally in multiple directions, creating a three-dimensional distribution pattern that enhances coverage and uniformity
3Reliability
If air moves vertically through the media stack, then aerobic biological environment is provided, but air distribution uniformity is insufficient
Solution Approach 1:
The air flow path is segmented into multiple layers with alternating orientations, forcing air to change direction laterally as it passes through each layer. This segmentation prevents direct vertical channeling and promotes more uniform distribution of air throughout the media block, while still maintaining the vertical flow necessary for aerobic conditions
4Quantity of substance
If diffused air is injected under the media, then air can be distributed through the media, but air-lift pumping action and oxygen transfer efficiency are suboptimal
Solution Approach 1:
The corrugated flute structures create curved flow paths that enhance mixing and turbulence as air and water move through the media. The alternating angles of the flutes in different layers create a spiraling or zigzag flow pattern that increases contact between air bubbles and water, improving oxygen transfer efficiency without requiring additional air injection volume
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 solution improves mixing, oxygen transfer, and biomass contact, leading to enhanced removal rates of BOD and ammonia, and increased efficiency in wastewater treatment and cooling tower applications.
Implementation Method 1
a first corrugated sheet having corrugations defining flutes angled in a first direction, a second corrugated sheet defining flutes angled in a second direction... provide a controlled dispersal of the fluid or gas
Data Source
AI summary
A structured sheet cross flow media is formed with a first corrugated sheet having corrugations defining flutes angled in a first direction, a second corrugated sheet defining flutes angled in a second direction, and an interstitial planar sheet disposed between the first and second corrugated sheets. The interstitial planar sheet traps the flow of fluid or gas, such as air, entering one end of the media block within opposing flutes until the end of the interstitial sheet is reached, whereupon the fluid or gas can disperse between the intersecting flutes of the first and second sheets to provide a controlled dispersal of the fluid or gas. In one embodiment, the interstitial sheet terminates at an intermediate height in the media block to define the width of dispersion of air bubbles entering at a single source point.