Membrane Bioreactor Facultative Environment Control
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Solution Overview
Problem
Conventional wastewater treatment methods with membrane bioreactors have complex structures, high energy consumption, and unstable operations due to the need for multiple dissolved oxygen environments, making them difficult to control and maintain.
Innovation Solution
A membrane bioreactor system with a reaction vessel, membrane separation, and aeration systems that maintain a facultative-organism adapted environment by controlling dissolved oxygen concentrations between 0 and 1.5 mg/L, using microporous or perforated aeration systems to concentrate oxygen in the membrane separation area, allowing for efficient pollutant degradation without physical area division.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional wastewater treatment methods use multiple dissolved oxygen environments (anaerobic, aerobic, facultative) in one reaction system, then pollutant degradation is achieved, but the system becomes complex with multiple control points and high energy consumption
Solution Approach 1:
The patent combines multiple dissolved oxygen environments (anaerobic, aerobic, and facultative) into a single reaction system without physical dividers. Different zones within the same reactor maintain different oxygen concentrations through controlled aeration, eliminating the need for separate reaction chambers and reducing structural complexity while maintaining pollutant degradation efficiency.
Solution Approach 2:
The patent creates local variations in dissolved oxygen concentration within the single reaction system. By controlling aeration rates and using membrane separation, different regions of the reactor maintain distinct oxygen levels (anaerobic in some zones, aerobic in others), allowing simultaneous occurrence of different biological processes without physical division.
2Productivity
If conventional methods dispose of different dissolved oxygen environments in one reaction system, then pollutant degradation occurs, but control becomes difficult and operation becomes unstable
Solution Approach 1:
The patent controls the dissolved oxygen concentration as a key parameter to maintain it within a specific range (0-1.5 mg/L) in the reaction system. By adjusting aeration rates and monitoring oxygen levels, the system achieves stable operation with facultative organisms that can adapt to varying oxygen conditions, simplifying control compared to maintaining strictly separate anaerobic and aerobic zones.
3Productivity
If conventional wastewater treatment systems are designed with multiple dissolved oxygen environments, then complete pollutant degradation is achieved, but energy consumption increases
Solution Approach 1:
The patent applies partial aeration by maintaining dissolved oxygen at low levels (0-1.5 mg/L) rather than providing full aerobic conditions throughout the system. This partial oxygen supply is sufficient for facultative organisms to degrade pollutants effectively while consuming significantly less energy than complete aerobic treatment would require.
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
This approach simplifies control, reduces energy consumption, and achieves high-efficiency pollutant degradation with zero discharge of organic residual sludge by maintaining a facultative environment and optimizing oxygen distribution, enhancing the stability and efficiency of the wastewater treatment process.
Implementation Method 1
The aeration system is adapted to enable a dissolved oxygen concentration in the reaction vessel to be larger than 0 and smaller than 1.5 mg/L
Implementation Method 2
The membrane separation system employs a microfiltration membrane or an ultrafiltration membrane
Implementation Method 3
The membrane separation system employs a microfiltration membrane or an ultrafiltration membrane
Data Source
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AI summary
A wastewater treatment system by the membrane bioreactor without physical area division includes a reaction vessel (7), a membrane separation system, a water production system and an aeration system. The membrane separation system is disposed inside the reaction vessel (7). The water production system communicates with the membrane separation system to pump filtrate out of the membrane separation system. The aeration system is employed to aerate the reaction vessel (7) and the membrane separation system. Also provided is a method of wastewater treatment using a membrane bioreactor by controlling aeration to enable a dissolved oxygen concentration to be 0 to 1.5 mg/L, so that the integrated reaction vessel (7) is kept under a facultative environment. The method and the wastewater treatment system by the membrane bioreactor without physical area division existing only under facultative environment, are easy to control and consume less dissolved oxygen.