Bio-electrochemical Sensor for Real-time Wastewater BOD COD Monitoring
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Solution Overview
Problem
Current methods for measuring biochemical oxygen demand (BOD) and chemical oxygen demand (COD) in wastewater treatment processes are slow, costly, and lack real-time capabilities, making it difficult to monitor operations and compliance effectively.
Innovation Solution
A system that uses sensors and flow meters to collect data from wastewater treatment processes, with a programmable logic controller (PLC) computing BOD and COD loads in real-time by measuring electrical currents or voltages from bio-electrochemical systems and adjusting data to synchronize sampling intervals, allowing for instantaneous and periodic measurements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If physical sampling and offsite laboratory analysis are used to measure BOD or COD concentration, then measurement accuracy is improved, but measurement speed and real-time capability deteriorate
Solution Approach 1:
The patent replaces the mechanical physical sampling and laboratory analysis system with an electrochemical sensing system. The sensor directly measures BOD or COD concentration in the wastewater stream through electrochemical reactions, eliminating the need for physical sampling, transport to laboratories, and manual analysis, thereby achieving real-time measurements while maintaining accuracy.
Solution Approach 2:
The patent introduces an intermediary substance or reaction mechanism that enables direct measurement. The electrochemical sensor uses intermediary electrochemical reactions between the sensor electrode and wastewater constituents to translate chemical concentrations into measurable electrical signals, allowing real-time detection without direct physical sampling.
2Measurement precision
If periodic physical sampling is performed, then measurement accuracy is maintained, but time loss and operational efficiency deteriorate
Solution Approach 1:
The patent implements continuous measurement by keeping the sensor permanently installed in the wastewater stream. Instead of periodic sampling, the sensor continuously monitors BOD or COD concentration, providing uninterrupted real-time data that eliminates time loss associated with sampling intervals while maintaining measurement accuracy through continuous electrochemical detection.
Solution Approach 2:
The patent substitutes the periodic mechanical sampling process with continuous electrochemical detection. The sensor remains continuously engaged with the wastewater stream, performing measurements at every moment rather than at discrete periodic intervals, thereby eliminating time loss while maintaining precision through continuous monitoring.
3Reliability
If standard laboratory analysis methods are used, then measurement reliability is improved, but device complexity and cost deteriorate
Solution Approach 1:
The patent extracts the essential measurement function from the complex laboratory analysis system. By using a specialized electrochemical sensor that performs BOD or COD measurement directly in the field, the system removes the need for complex laboratory equipment, sample preparation protocols, and manual analysis procedures, thereby reducing device complexity and cost while maintaining reliability through standardized electrochemical measurement principles.
Solution Approach 2:
The patent employs a relatively simple, cost-effective electrochemical sensor that can be deployed directly in the wastewater stream. This disposable or easily replaceable sensor unit provides reliable measurements without requiring expensive laboratory infrastructure, complex calibration systems, or specialized trained personnel, thereby reducing overall system complexity and cost while maintaining measurement reliability.
4Productivity
If real-time monitoring is implemented using sensors, then productivity and operational efficiency are improved, but device complexity increases
Solution Approach 1:
The patent designs the electrochemical sensor system to perform multiple functions: it measures BOD or COD concentration, provides real-time data, and can be integrated with control systems for automated response. This multi-functionality increases productivity by enabling real-time monitoring and operational adjustments without requiring separate systems for each function, thereby managing complexity through consolidation.
Solution Approach 2:
The patent implements feedback mechanisms where sensor measurements are continuously fed back to control systems. This enables automated adjustments to treatment processes based on real-time BOD or COD levels, improving productivity through closed-loop control. The feedback system manages complexity by using simple proportional control algorithms that respond directly to sensor signals without requiring complex decision-making algorithms.
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
Enables real-time monitoring of BOD and COD loads, improving operational efficiency and compliance by providing timely and accurate data for system-level decisions.
Implementation Method 1
measuring electrical currents or voltages from bio-electrochemical systems
Data Source
AI summary
The effectiveness and efficiency of wastewater treatments is computed on a real-time basis