SBR-MBR Wastewater Integration for Oxygen Utilization
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Solution Overview
Problem
The combination of SBR and MBR systems in wastewater treatment faces challenges due to different flow systems when hydraulically connected, leading to inefficient oxygen utilization and increased energy consumption, as well as the need for additional deoxidation zones.
Innovation Solution
Dividing the SBR tank into two hydraulically connected tanks with a distribution channel that brings oxygen-rich sludge from the MBR into the SBR during the nitrification phase, allowing for continuous process optimization and eliminating the need for a deoxidation zone.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If SBR and MBR systems are hydraulically connected with different flow systems, then oxygen-rich sludge can be returned from MBR to SBR, but oxygen utilization becomes inefficient and energy consumption increases
Solution Approach 1:
The system dynamically adjusts the operational mode of SBR tanks between nitrification and denitrification phases based on real-time conditions. During nitrification phase, MBR effluent is returned to SBR to provide oxygen-rich sludge, while during denitrification phase, the return is stopped to prevent oxygen interference, optimizing oxygen utilization and reducing energy waste
Solution Approach 2:
The system changes operational parameters (flow direction, aeration status, tank mode) based on the phase of the SBR process. By monitoring and adjusting these parameters dynamically, the system ensures that oxygen-rich sludge return only occurs when beneficial (during nitrification), thereby improving oxygen utilization efficiency and reducing unnecessary energy consumption
2Quantity of substance
If SBR and MBR systems are hydraulically connected with different flow systems, then oxygen-rich sludge can be returned from MBR to SBR, but dissolved oxygen interferes with denitrification process
Solution Approach 1:
The SBR system operates in periodic cycles with distinct nitrification and denitrification phases. During denitrification phase, the system stops returning MBR effluent and isolates the anoxic zone to prevent oxygen interference, ensuring reliable denitrification. The periodic switching between phases with corresponding adjustments in sludge return timing ensures that oxygen-rich sludge only enters during nitrification when it is beneficial
Solution Approach 2:
The SBR system is divided into separate functional zones (aerobic nitrification zone and anoxic denitrification zone) with controlled flow paths. By segmenting the system and controlling effluent return to specific zones based on operational phase, the invention prevents oxygen from interfering with the denitrification process while still allowing oxygen-rich sludge to benefit the nitrification process
3Productivity
If conventional SBR process is used with batch operations, then nitrification and denitrification can be performed in sequences, but additional deoxidation zones are required
Solution Approach 1:
The MBR system serves multiple functions: it performs biological treatment, acts as a settling zone, and provides a source of oxygen-rich sludge for the SBR nitrification phase. By integrating these functions into the MBR, the system eliminates the need for separate deoxidation zones, reducing device complexity while maintaining productivity
Solution Approach 2:
The invention merges the MBR system with the SBR system through hydraulic connection, combining the functions of biological treatment, settling, and oxygen-rich sludge generation into a single integrated system. This merging eliminates the need for separate deoxidation zones, reducing overall system complexity while maintaining effective nitrification and denitrification processes
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 enhances oxygen utilization, optimizes energy use, and reduces tank volume requirements, resulting in higher-quality effluent and significant energy savings, while maintaining effective nitrification and denitrification processes.
Implementation Method 1
The first phase is a nitrification process, converting ammonium (NH4+) to nitrate (NO3-)
Implementation Method 2
The second phase in the SBR is the denitrification process or the anoxic phase, where denitrifying bacteria converts nitrate to molecular nitrogen (N2)
Implementation Method 3
By utilizing membrane, MBR separates the activated sludge and other biological or organic matter in wastewater
Implementation Method 4
In MBR air scouring is used for controlling membrane fouling and oxygen content in the MBR cells is kept at a high level
Data Source
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AI summary
A wastewater treatment system and a wastewater treatment process, fluidly combining a one or more SBR (sequencing batch reactor) module/s, in which nitrification and denitrification of the wastewater are performed in sequences and one or more MBR (membrane bioreactor) module/s.