Micro-bubble Oxidation for PMIDA Wastewater
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Solution Overview
Problem
Wet air oxidation technology for high-salinity wastewater treatment faces limitations due to high investment costs, high operation requirements, low reaction efficiency, and high energy consumption, primarily due to the need for high temperature and pressure conditions which result in short gas-liquid contact times and excessive air usage.
Innovation Solution
A treatment system incorporating a micro-interface unit in the oxidation reactor to break gas bubbles into micron-scale bubbles, increasing the gas-liquid interfacial area and residence time, allowing for efficient mass transfer at reduced temperature and pressure, thereby enhancing reaction efficiency and reducing energy consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If high temperature and high pressure conditions are used in wet air oxidation, then oxidation reaction efficiency is improved, but investment cost and safety risks increase
Solution Approach 1:
The patent changes the operating parameters from high temperature (200-300℃) and high pressure (0.5-2.0MPa) to low temperature (50-100℃) and atmospheric pressure conditions by introducing a micro-bubble generator that creates fine bubbles with diameter of 10-100 micrometers, fundamentally altering the reaction conditions while maintaining effectiveness
Solution Approach 2:
The patent employs a micro-bubble generator that produces porous fine bubble structures in the gas phase, increasing the interfacial area between gas and liquid phases. This porous-like bubble structure enables efficient mass transfer without requiring high temperature and pressure, thus improving safety while maintaining oxidation efficiency
2Quantity of substance
If high pressure is applied to enhance oxygen delivery, then mass transfer is improved, but energy consumption and operation cost increase
Solution Approach 1:
The patent changes the pressure parameter from high pressure (0.5-2.0MPa) to atmospheric pressure by using micro-bubble generation technology, which compensates for the lack of pressure-driven mass transfer through dramatically increased interfacial area provided by fine bubbles
Solution Approach 2:
The patent transitions from pressure-based mass transfer (one-dimensional approach) to surface-area-based mass transfer by creating micro-bubbles throughout the liquid phase. This dimensional shift from bulk pressure to distributed surface area enables efficient oxygen delivery without high pressure
3Speed
If large gas bubbles are used in the reactor, then gas flow is maintained, but gas-liquid contact time is reduced and mass transfer efficiency decreases
Solution Approach 1:
The patent segments large gas bubbles into numerous fine micro-bubbles with diameter of 10-100 micrometers through a micro-bubble generator. This segmentation increases the total number of bubbles and their collective surface area while reducing individual bubble rise velocity, thereby extending gas-liquid contact time and improving mass transfer efficiency
4Quantity of substance
If excess air is supplied to compensate for short contact time, then oxygen availability is maintained, but air consumption and operation cost increase
Solution Approach 1:
The patent changes the bubble size parameter to micro-scale (10-100 micrometers), which dramatically increases the surface area to volume ratio. This parameter change enables sufficient oxygen transfer with much lower air consumption because the extended contact time and increased interfacial area compensate for the reduced driving force
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 system achieves a 99% removal rate of harmful substances with reduced energy consumption and operational costs, while minimizing safety hazards and equipment investment, making it more suitable for large-scale applications.
Implementation Method 1
A micro-interface unit disposed at a lower part in the oxidation reactor for dispersing crushed gas into bubbles
Implementation Method 2
The organic substances in the wastewater are subjected an oxidization reaction in the reactor with the oxygen in the air
Implementation Method 3
Wet Air oxidation (WAO) is to oxidize organic substances and reduced inorganic substances in wastewater into easily biochemical small molecular substances or to mineralize into harmless inorganic substances and inorganic salts by using air or oxygen as an oxidant under operation conditions of high temperature and high pressure
Implementation Method 4
A gas-liquid mixture composed of reacted wastewater and tail gas exchanges heat with feed wastewater by means of a heat exchange system, so as to cool the gas-liquid mixture and preheat the feed wastewater
Implementation Method 5
The cooled gas-liquid mixture enters a separator for performing a gas-liquid separation
Data Source
AI summary
The invention provides a treatment system and a treatment method for PMIDA high-salinity wastewater. The treatment system includes a booster pump, a water inlet-outlet heat exchanger, a water inlet heater and an oxidation reactor, and the water inlet-outlet heat exchanger is provided with a wastewater inlet, a wastewater outlet, an oxidized water inlet, and an oxidized water outlet. An oxidized water from the oxidation reactor enters the water inlet-outlet heat exchanger through the oxidized water inlet, the oxidized water outlet is connected to an intermediate tank, the wastewater inlet is connected to the booster pump, and the wastewater outlet is connected to a wastewater heater. A micro-interface unit is disposed at the lower part in the oxidation reactor, for dispersing crushed gas into bubbles. A gas inlet is formed at a side wall of the oxidation reactor and is connected to the micro-interface unit through a pipeline.