UV/Vis and ORP Sensor Control for Ozonation Energy Optimization
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Solution Overview
Problem
Current water and wastewater treatment processes for ozonation and biologically aerated filtration lack unified monitoring and control parameters, leading to inefficient ozone and air dosage, resulting in energy wastage and suboptimal treatment performance due to separate and pre-set control methods.
Innovation Solution
Implementing UV/Vis spectral measurement and online Oxidation/Reduction Potential (ORP) as unified indicators for real-time monitoring and control, using a microprocessor to adjust ozone and air dosages based on measured UV absorption and ORP values, with a PID control loop to optimize effluent quality and minimize energy consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If pre-set aeration rate is used in BAF process, then operation is simple, but treatment performance is suboptimal due to lack of real-time adjustment
Solution Approach 1:
The system uses UV absorption and ORP sensors to continuously monitor effluent quality and feeds this information back to the microprocessor, which automatically adjusts aeration rate and ozone dosage. This closed-loop feedback mechanism maintains optimal treatment performance while simplifying operator intervention.
Solution Approach 2:
The control system performs self-adjustment of aeration and ozonation parameters based on real-time sensor readings. The microprocessor autonomously modifies process conditions without requiring manual intervention, enabling the system to self-optimize treatment performance while maintaining operational simplicity.
2Device complexity
If ozone dosage is predetermined without real-time monitoring, then control is simple, but energy is wasted due to overfeeding or underfeeding
Solution Approach 1:
UV absorption and ORP measurements provide real-time feedback on ozonation effectiveness. The microprocessor uses this feedback to dynamically adjust ozone dosage, preventing both overfeeding (energy waste) and underfeeding (inadequate treatment).
Solution Approach 2:
The system transitions from static predetermined ozone dosage to dynamic real-time adjustment. Ozone dosage continuously adapts based on measured UV absorption and ORP values, optimizing energy utilization while maintaining effective disinfection and biodegradability enhancement.
3Measurement precision
If multiple separate sensors are used for monitoring turbidity, TOC, ammonia, and dissolved oxygen, then measurement coverage is comprehensive, but system complexity increases
Solution Approach 1:
The UV absorption sensor serves multiple functions: it monitors organic matter concentration, disinfection effectiveness, and process optimization. Combined with ORP measurement, this multi-functional approach provides comprehensive process monitoring with fewer sensors, reducing system complexity while maintaining measurement precision.
4Reliability
If excessive process air is delivered to BAF, then dissolved oxygen is elevated ensuring sufficient oxygen supply, but energy consumption increases due to wasted aeration
Solution Approach 1:
The system uses dissolved oxygen measurements and UV absorption feedback to dynamically adjust aeration rate. When oxygen levels are sufficient and treatment objectives are met, aeration is reduced, preventing energy waste while ensuring adequate oxygen supply for BOD removal and nitrification.
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 enables precise and energy-efficient control of ozone and air dosages, ensuring desired effluent quality while reducing energy consumption and maintaining optimal treatment performance by adjusting based on real-time UV absorption and ORP readings.
Implementation Method 1
obtaining an online measurement of the UV absorption at one or multiple wavelengths
Implementation Method 2
obtaining an online measurement of the UV absorption at one or multiple wavelengths and of the oxidation/reduction potential of an effluent
Data Source
AI summary
The present invention relates to a method and system for monitoring and controlling the process train of ozonation and biologically aerated filtration used in water and wastewater treatment. The process monitoring and control can be achieved by online measurement of UV/Vis absorption at one or multiple wavelengths and oxidation/reduction potential values which are compared to predetermined UV absorption and oxidation/reduction values. The air and ozone dosage of the effluent are then adjusted based on the measured values of UV/Vis absorption and oxidation/reduction potential of the effluent.