Bio-electrochemical Sensor for Real-time Ozone Dosing Control
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Solution Overview
Problem
Current wastewater treatment systems face challenges in optimizing ozone dosing in ozonation units, leading to inefficient biodegradation of refractory compounds and increased operational expenses due to excessive ozone consumption and formation of unwanted byproducts, with existing measurement methods like fluorescence or UV/Vis being inaccurate and impractical for real-time control.
Innovation Solution
Incorporating a bio-electrochemical sensor to measure metabolic activity, such as carbon consumption rate, to adjust ozone delivery in real-time, optimizing the ozonation process by correlating sensor data with historical plant data to create a site-specific algorithm for controlling ozone generation, ensuring maximum biodegradability of organic compounds while minimizing energy and ozone use.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If ozone dosing is increased to improve biodegradation of refractory compounds, then treatment effectiveness is improved, but operational expenses increase due to excessive ozone consumption and formation of unwanted byproducts
Solution Approach 1:
The system employs a biological sensor that provides real-time feedback on the biodegradability of organic compounds in the effluent. This feedback loop enables dynamic adjustment of ozone dosing rates, allowing the system to optimize treatment effectiveness while minimizing ozone consumption and operational expenses by avoiding both under-dosing and over-dosing scenarios
Solution Approach 2:
The ozone dosing rate is made dynamic rather than static, adjusting in real-time based on measured biodegradability parameters. This dynamic control allows the system to adapt to varying influent characteristics and treatment conditions, maintaining optimal treatment effectiveness while reducing energy waste from excessive dosing
2Loss of energy
If ozone dosing is optimized to reduce operational expenses, then energy efficiency is improved, but treatment effectiveness decreases due to insufficient biodegradation
Solution Approach 1:
Real-time feedback from the biological sensor ensures that ozone dosing never falls below the threshold needed for effective biodegradation. The sensor continuously monitors effluent biodegradability and adjusts dosing accordingly, preventing under-treatment while avoiding the energy waste of over-treatment
Solution Approach 2:
The biological sensor utilizes naturally occurring microorganisms in the effluent to perform the measurement function, eliminating the need for complex external measurement systems. This self-service approach provides accurate real-time data for optimization without adding significant system complexity or cost
3Device complexity
If existing measurement methods like fluorescence or UV/Vis sensors are used, then device complexity is reduced, but measurement precision is insufficient for real-time control of ozone dosing
Solution Approach 1:
The biological sensor acts as an intermediary that translates complex biodegradability information into a simple, measurable signal. By using the metabolic activity of microorganisms as the sensing mechanism, the system achieves high measurement precision for biodegradability without requiring complex analytical instrumentation
Solution Approach 2:
The patent replaces complex optical measurement systems (fluorescence or UV/Vis sensors) with a biological sensing mechanism that directly measures biodegradability through microbial metabolic activity. This substitution provides more relevant and precise measurements for controlling biological treatment processes while maintaining relatively simple device architecture
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 allows for precise control of ozone dosage, enhancing the efficiency of downstream biological treatment, reducing operational expenses, and minimizing the formation of unwanted byproducts, thereby achieving optimal treatment performance and cost-effectiveness.
Implementation Method 1
the biological sensor is a bio-electrochemical sensor adapted to measure metabolic activity, for example a carbon consumption rate by producing an electrical signal related to the metabolic activity of bacteria on an electrode of the sensor
Implementation Method 2
The contaminants in the wastewater may be biologically degraded after being contacted with ozone
Data Source
AI summary
A water treatment system has an ozonation unit (12), a biological sensor (16) and optionally a biological treatment unit (14). The biological sensor (16) measures the biodegradability of organic contaminants after ozonation. The biological sensor (16) may be a bio-electrochemical sensor that produces an electrical signal related to the metabolic activity of bacteria on an electrode of the sensor. The biological sensor (16) may be connected to a controller (18) adapted to adjust one or more operating parameters of the ozonation unit (12) or the biological treatment unit (16) or both. A method of treating water, and a method of controlling a water treatment process, using a biological sensor to measure the biodegradability of water are further described. The measurement may be used to adjust an upstream ozonation process or a downstream biological treatment process. The systems and methods may be used to remove refractory organic compounds or organic micro-pollutants from secondary or tertiary effluent from a municipal or industrial wastewater plant.