Ultrafine Bubble Wastewater Treatment for High Oxygen Transfer
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Solution Overview
Problem
Existing wastewater treatment methods in the oil industry, such as aeration and chemical oxidation, are inefficient and costly, failing to achieve significant reductions in chemical oxygen demand (COD) and chemical oxygen demand (COD) and chemical oxygen demand (COD) and chemical oxygen demand (COD) and total petroleum hydrocarbons (TPH) levels, particularly in the presence of volatile organic compounds (VOCs), with macrobubbles and chemical processes generating sludge and requiring continuous thermal control.
Innovation Solution
The use of ultrafine bubbles with diameters of 200 nm or less, generated under continuous flow conditions, enhances hydrocarbon degradation and microbial removal by increasing bubble density and oxidative power, eliminating the need for additional reagents and reducing maintenance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If conventional aeration using macrobubbles is used, then the aeration process can be implemented, but the oxygen transfer efficiency is low (only 4-8% transfer) and the residency time in water is short
Solution Approach 1:
The invention segments the aeration process by using ultrafine bubbles (diameter ≤ 200 nm) instead of conventional macrobubbles. This segmentation increases the total surface area of bubbles in contact with water, thereby dramatically improving oxygen transfer efficiency from 4-8% to up to 95%, while the small size allows longer residency time in the aqueous medium.
Solution Approach 2:
The invention changes the critical parameter of bubble diameter from millimeter/centimeter scale (conventional) to sub-micrometer scale (≤200 nm). This parameter change fundamentally alters the bubble behavior, increasing both oxygen transfer efficiency and residency time, as the ultrafine bubbles remain suspended in water much longer and provide vastly increased surface area for gas-liquid mass transfer.
2Productivity
If chemical oxidation methods (Fenton process) are used, then hydrocarbon oxidation can be achieved, but continuous addition of reagents (iron(II) sulfate and hydrogen peroxide) and thermal control are required, increasing operational complexity and cost
Solution Approach 1:
The invention employs self-service by using ultrafine bubbles to generate in-situ oxidative conditions without requiring external chemical reagents. The ultrafine bubbles themselves provide the oxidizing power through dissolved oxygen, eliminating the need for continuous addition of iron(II) sulfate and hydrogen peroxide, and removing the requirement for pH control and thermal management associated with Fenton processes.
Solution Approach 2:
The invention extracts the essential oxidizing function from complex chemical reagent systems and isolates it into a purely physical process using ultrafine bubbles. This extraction removes the harmful and complex chemical components (iron salts, hydrogen peroxide, pH adjustments) while retaining the hydrocarbon degradation capability through physical aeration alone.
3Area of stationary object
If conventional aeration plants are used, then aeration can be provided, but the facilities require maintenance and can be out of service, and the influence zone is very small
Solution Approach 1:
The invention transitions from macroscopic bubble aeration to nanoscale ultrafine bubble aeration, representing a dimensional change that expands the influence zone. The ultrafine bubbles distribute much more uniformly throughout the water column, creating a vastly larger effective treatment volume and influence zone compared to conventional macrobubbles that rise quickly and affect only localized areas.
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
Ultrafine bubbles achieve up to 95% oxygen transfer efficiency, effectively degrading VOCs and TPH, including MTBE and BTEX, with negligible corrosion and biocidal effects, while maintaining low operational costs and minimal maintenance.
Implementation Method 1
transfer rates from oxygen into water of up to 95% have been observed, compared with traditional bubbling systems
Implementation Method 2
increased the oxidative power, eliminating the need for additional reagents
Implementation Method 3
obtaining a biocidal effect for microorganism removal
Data Source
AI summary
A method and apparatus for wastewater treatment using ultrafine bubbles, wherein bubbles of 200 nm or less are contacted with a wastewater volume in continuous flow conditions by means of an ultrafine bubble generator, a source of oxygen, a tank, a first and a second pump, a pipe system and connectors, the connectors being configured such that continuous flow conditions are maintained in the pipe system.