Skewed Two-Blade Impeller for Debris Shedding in Wastewater Aeration
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Solution Overview
Problem
Aeration impellers in wastewater treatment face challenges such as impeller obstructions and malfunctions due to debris, leading to reduced efficiency and increased maintenance costs, while existing designs lack effectiveness in mixed and oxygen transfer efficiency across various applications.
Innovation Solution
A blower-assisted aerator system with a highly skewed, unraked two-blade impeller design, featuring a low drag, pressure equalized foil shape and progressive pitch distribution, which is submerged in the liquid and optimized to shed debris and maintain performance in high debris environments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional aeration impellers are used in wastewater treatment, then oxygen transfer is achieved, but impeller obstructions and malfunctions occur due to debris
Solution Approach 1:
The patent applies the 'Blessing in disguise' principle by designing the impeller to convert the harmful effect of debris into a beneficial outcome. The specially shaped blades are designed to shed debris rather than be obstructed by it, transforming the problem of debris accumulation into an advantage where debris is actively removed from the impeller surface during operation, thereby improving operational reliability
Solution Approach 2:
The patent applies 'Parameter changes' by modifying the geometric parameters of the impeller blades, specifically the skew angle and pitch distribution. These parameter changes optimize the blade shape to reduce debris adhesion and improve debris shedding characteristics, allowing the impeller to maintain reliability in high-debris environments without structural modifications
2Productivity
If high power impellers are used to achieve adequate aeration, then oxygen transfer efficiency increases, but energy consumption increases
Solution Approach 1:
The patent applies 'Parameter changes' by optimizing the impeller blade geometry parameters including skew angle, pitch distribution, and blade shape. These parameter optimizations enable the impeller to achieve high aeration efficiency at lower power consumptions by improving oxygen transfer effectiveness without requiring increased motor power
Solution Approach 2:
The patent applies 'Partial or excessive action' by designing the impeller to create optimal turbulence and gas-liquid contact without excessive power input. The blade design generates sufficient mixing and aeration effects through carefully controlled fluid dynamics rather than high-power operation, achieving adequate oxygen transfer with energy-efficient operation
3Adaptability or versatility
If conventional impeller designs are used, then manufacturing is simple, but aeration effectiveness varies across different applications
Solution Approach 1:
The patent applies 'Parameter changes' by establishing optimized geometric parameters for the impeller blades including skew angle ranges, pitch distribution patterns, and blade shape characteristics. These parameter specifications provide a standardized design framework that maintains manufacturing simplicity while achieving improved adaptability across different wastewater treatment applications through optimized performance characteristics
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 enhances aeration efficiency, reduces impeller obstructions, and expands the range of wastewater treatment applications by maintaining optimal mixing and oxygen transfer rates while minimizing maintenance and replacement costs.
Implementation Method 1
a blower having a blower air inlet and an air outlet, the blower forcing air from the blower inlet into the air line inlet and through the air line to the air line outlet
Implementation Method 2
As the impeller turns, air is actively or passively mixed into the turbulent water
Implementation Method 3
Aeration apparatuses introduce air into a liquid. While most applications depend upon dissolving at least a portion of the oxygen contained in the air into the liquid
Implementation Method 4
each one of the two blades having a low drag, pressure equalized foil shape
Data Source
AI summary
An apparatus for treating fluids having improved aeration efficiency and operational durability has an aerator, an impeller, and a liquid reservoir containing liquid to be treated. The aerator has: a motor rotating the impeller at a blade tip speed less than 1,100 inches/second; an air line having an outlet submerged in the liquid and an inlet adjacent to the motor; and a blower. The blower forces air through the air line to the air line outlet. The impeller two blades extending radially from the hub. Each blade has: a low drag, pressure equalized foil shape absent of rake; a leading edge extending from the hub tangentially; a 0.47-0.55 impeller EAR; 0.59-0.87 Pmean/D; progressive pitch distribution based on radius where from 50% R and out is constant and from 50% R to the hub is reduced; and 60-75 degree skew with a linear distribution from 50% radius to blade tip.