Wastewater Treatment With Real-Time Carbon Source Control
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Solution Overview
Problem
Existing wastewater treatment methods for semiconductor wastewater face challenges in controlling the input amount of organic carbon source due to manual operations and unreliable NH3 concentration measurements, leading to increased quality deviations and difficulty in responding to changes in wastewater composition.
Innovation Solution
A wastewater treatment system and method that uses a feed-forward control approach to calculate the organic carbon source input based on real-time analysis of NH3 and NO3 concentrations in various tanks, eliminating the need for manual adjustments and improving reliability by analyzing wastewater directly rather than relying on installed measurement units.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If manual operations are performed to adjust organic carbon source input based on nitrate nitrogen concentration, then the control can be performed, but the number of quality deviations increases due to multiple manual operations
Solution Approach 1:
The system performs self-measurement and self-control of organic carbon source input. The measurement unit automatically measures nitrate nitrogen concentration in the re-aeration tank, and the control unit automatically adjusts the organic carbon source input amount based on the measured value, eliminating the need for manual operations and reducing quality deviations
Solution Approach 2:
The system implements a feedback control mechanism where the measured nitrate nitrogen concentration is fed back to the control unit, which then adjusts the organic carbon source input accordingly. This closed-loop feedback system ensures consistent quality by automatically compensating for variations in wastewater composition
2Measurement precision
If a measurement system is installed in the organic water-collection tank to measure NH3 concentration, then the measurement can be performed, but maintenance is required and reliability decreases
Solution Approach 1:
The measurement function is extracted from the organic water-collection tank environment and relocated to the wastewater supply device where wastewater is first introduced. This extraction eliminates the measurement system from the problematic organic water-collection tank environment, removing the source of measurement errors and maintenance issues
Solution Approach 2:
The system uses the wastewater supply device as an intermediary measurement point. Instead of measuring NH3 concentration directly in the organic water-collection tank, the system measures it at the wastewater supply device, which serves as an intermediary location that provides accurate measurement data without the complications of the collection tank environment
3Reliability
If organic carbon source input is controlled using feed-back method based on nitrate nitrogen concentration in re-aeration tank, then control can be achieved, but response time is delayed and quality deviations increase
Solution Approach 1:
The system performs preliminary measurement of nitrate nitrogen concentration in the re-aeration tank and uses this information to proactively adjust organic carbon source input in the second denitrification tank. By measuring and responding in advance, the system prevents quality deviations before they occur rather than reacting after they occur
Solution Approach 2:
The control unit receives feedback from the measurement unit regarding nitrate nitrogen concentration and automatically adjusts the organic carbon source input amount accordingly. This real-time feedback mechanism enables rapid response to changing conditions, minimizing quality deviations and eliminating the need for delayed manual adjustments
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 minimizes manual operations, enhances reliability, and allows for immediate adjustment of organic carbon source input, ensuring accurate nitrogen concentration control and reducing quality deviations.
Implementation Method 1
a first denitrification tank configured to receive the raw water from the organic water-collection tank and to convert the raw water into primary treated water by reducing nitrate nitrogen contained in the raw water into nitrogen gas
Implementation Method 2
a nitrification tank configured to receive the primary treated water from the first denitrification tank and to convert the primary treated water into secondary treated water by oxidizing ammonia nitrogen in the primary treated water
Implementation Method 3
a second denitrification tank configured to receive the secondary treated water from the nitrification tank and to receive an organic carbon source from the carbon supply unit to remove residual nitrate nitrogen from the secondary treated water
Implementation Method 4
a re-aeration tank configured to receive the tertiary treated water from the second denitrification tank and to convert the tertiary treated water into quaternary treated water by removing nitrogen gas from the tertiary treated water and oxidizing residual ammonia nitrogen in the tertiary treated water into nitrate nitrogen
Data Source
AI summary
A wastewater treatment system including an organic water-collection tank configured to receive and store wastewater as raw water, a first denitrification tank configured to convert the raw water into primary treated water a nitrification tank configured to convert the primary treated water into secondary treated water, a second denitrification tank configured to receive an organic carbon source from a carbon supply unit and to convert the secondary treated water into tertiary treated water, a re-aeration tank configured to convert the tertiary treated water into a quaternary treated water, a sedimentation tank configured to separate the quaternary treated water into sludge and supernatant, a wastewater analysis unit configured to analyze information from the wastewater, and a control unit configured to calculate and control a supply amount of the organic carbon source using the wastewater information.