MBR Wastewater Tank Segmentation for Area and Aeration
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Solution Overview
Problem
Existing organic wastewater treatment systems using the MBR method face challenges in maintaining efficiency and reducing installation area, particularly due to increased aeration power requirements and complex maintenance procedures when membrane separation devices are installed in deep tanks, and insufficient space for diffusers at high MLSS concentrations.
Innovation Solution
The system divides the treatment tank into upper and lower spaces using a top-bottom partition member, with anoxic tanks in the lower space and aerobic tanks with immersion-type membrane separation devices in the upper space, allowing for efficient denitrification and nitrification processes while reducing the installation area and simplifying maintenance by using denitrifying and nitrifying liquid transfer paths to circulate activated sludge throughout the tank.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If membrane separation devices are installed in deep aerobic tanks to reduce installation area, then the installation area is reduced, but the aeration power requirement increases significantly
Solution Approach 1:
The treatment tank is divided into multiple aerobic tanks arranged in series, with membrane separation devices installed in each tank. This segmentation allows the system to achieve the required treatment capacity without installing membranes in a single deep tank, thereby reducing the aeration power requirement while maintaining a compact footprint.
Solution Approach 2:
Instead of increasing water depth vertically to reduce area, the system extends horizontally by arranging multiple aerobic tanks in series. This dimensional transition allows membrane separation devices to be installed in shallower tanks, reducing aeration power requirements while achieving the same treatment capacity in a compact configuration.
2Productivity
If MLSS concentration is increased to improve treatment efficiency, then treatment efficiency is improved, but space for diffusers becomes insufficient
Solution Approach 1:
The system divides the treatment process into multiple aerobic tanks, allowing diffusers to be distributed across multiple compartments. This segmentation provides sufficient space for diffusers in each tank even at high MLSS concentrations, while maintaining overall treatment efficiency through the series configuration.
3Area of stationary object
If water depth is increased to reduce installation area, then installation area is reduced, but maintenance complexity increases
Solution Approach 1:
The treatment tank is segmented into multiple shallower aerobic tanks with membrane separation devices installed in each. This segmentation maintains water depth at manageable levels, facilitating easier maintenance operations while achieving compact installation area through horizontal arrangement of multiple tanks.
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 configuration reduces the installation area without increasing aeration load and simplifies maintenance by allowing efficient denitrification and nitrification processes, effectively treating organic wastewater while minimizing equipment costs and operational complexity.
Implementation Method 1
a membrane separation device for membrane-separating the water to be treated
Implementation Method 2
an organic wastewater treatment apparatus which biologically treats organic wastewater containing nitrogen in activated sludge in a treatment tank
Implementation Method 3
a plurality of aerobic tanks formed in the upper space of the treatment tank, each aerobic tank being provided with an immersion-type membrane separation device
Data Source
AI summary
An organic wastewater treatment apparatus biologically treats organic wastewater containing nitrogen using a treatment tank storing activated sludge. A top-bottom partition member divides the treatment tank in into an upper space and a lower space. A plurality of anoxic tanks are formed in the lower space, while a plurality of aerobic tanks, each of which having an immersion-type membrane separation device, are formed in the upper space. A raw water supply path divides and supplies the organic wastewater to each anoxic tank. A plurality of denitrifying liquid transfer paths repeatedly transfers the activated sludge from the anoxic tanks to the aerobic tanks, while a plurality of nitrifying liquid transfer paths repeatedly transfer the activated sludge from the aerobic tanks to the anoxic tanks, whereby the activated sludge is circulated throughout the treatment tank.