MABR Condensate Drainage Pipe for Oxygen Dissolution Efficiency
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Solution Overview
Problem
Aerobic biological treatment methods using membrane aeration bioreactors face low oxygen dissolution efficiency due to condensed water accumulation, which blocks gas passage and requires high-pressure compressors, leading to increased power consumption and reduced oxygen dissolution rates.
Innovation Solution
An aerobic biological treatment apparatus with an oxygen dissolution membrane module arranged in an up-down direction, featuring a water drainage pipe for condensate removal and a blower that supplies oxygen at lower pressure, maintaining high oxygen dissolution efficiency by discharging condensed water outside the reaction tank.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If condensed water is discharged by air pressure in MABR, then condensed water can be removed from hollow fiber membranes, but a compressor with higher pressure equal to or higher than water pressure is required and power consumption is extremely increased
Solution Approach 1:
The patent extracts the condensed water discharge function from the gas passage system by providing a separate water drainage pipe that is dedicated solely to removing condensed water. This separates the water removal function from the air pressure system, allowing condensed water to be discharged without requiring high-pressure compression, thereby reducing power consumption while maintaining reliable water discharge capability.
Solution Approach 2:
The patent introduces a separate water drainage pipe as an intermediary component that handles condensed water removal independently from the gas compression system. This intermediary structure allows condensed water to be discharged through a dedicated pathway without involving the high-pressure air compression mechanism, thus resolving the contradiction between effective water discharge and excessive power consumption.
2Quantity of substance
If condensed water accumulates in header pipe, then condensed water enters hollow fibers, but many hollow fibers are unable to pass air and oxygen dissolution efficiency is reduced greatly
Solution Approach 1:
The patent implements preliminary action by providing a water drainage pipe that proactively removes condensed water from the header pipe before it can enter and block the hollow fibers. This preventive measure ensures that the hollow fibers remain clear and functional, maintaining high oxygen dissolution efficiency without requiring intervention after blockage occurs.
Solution Approach 2:
The patent converts the harmful effect of condensed water accumulation into a beneficial outcome by designing a water drainage pipe that utilizes the natural flow of condensed water to a discharge position. Instead of allowing condensed water to harm the system by blocking hollow fibers, the system channels this condensed water through a dedicated drainage path, transforming the potential problem into a controlled removal process that protects oxygen dissolution efficiency.
3Speed
If air flow rate in hollow fibers is extremely slow at 1 mm/sec or less, then gas passage is efficient, but when condensed water enters, a large pressure difference occurs and gas flow stops
Solution Approach 1:
The patent extracts the condensed water removal function from the gas flow system by providing a separate water drainage pipe. This allows the air flow rate in hollow fibers to remain extremely slow (1 mm/sec or less) for efficient gas passage, while simultaneously providing a dedicated pathway to remove condensed water that would otherwise cause large pressure differences and stop gas flow, thus maintaining gas passage continuity.
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 apparatus effectively maintains high oxygen dissolution efficiency over time by quickly removing condensed water, reducing power consumption, and allowing for efficient oxygen supply without bubble generation, thus treating organic wastewater at lower costs.
Implementation Method 1
dissolution of oxygen into water to be treated is necessary, and aeration by a diffuser pipe is usually performed... MABR that performs aerobic biological treatment by attaching biofilms to the outside of hollow fiber membranes and supplying oxygen from the inside can dissolve oxygen without generating bubbles
Implementation Method 2
condensed water is generated inside oxygen dissolution membranes due to penetration of water vapor from the reaction tank and condensation of water vapor in passing gas
Implementation Method 3
a water drainage pipe that discharges condensed water to outside of the reaction tank from the oxygen dissolution membrane module... discharge condensed water to a position lower than a lower end of the oxygen dissolution membrane module
Data Source
AI summary
An aerobic biological treatment apparatus includes a reaction tank (tank body), a water permeation plate horizontally installed in a lower part of the reaction tank, a large-diameter particle layer formed on an upper side of the water permeation plate, a small-diameter particle layer formed on an upper side of the large-diameter particle layer, an oxygen dissolution membrane module disposed on an upper side of the small-diameter particle layer, a receiving chamber formed on a lower side of the water permeation plate, a raw water dispersion pipe supplying raw water into the receiving chamber, a diffuser pipe installed to perform gas diffusion in the receiving chamber and the like. A condensed water drainage pipe branches from an exhaust pipe from the oxygen dissolution membrane module, and a valve is provided.