Bio-electrochemical BOD Sensor Using Immobilized Bacterial Membrane
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Solution Overview
Problem
Conventional BOD tests are time-consuming and not suitable for real-time or online monitoring of wastewater treatment efficiency, requiring the development of faster and more reliable methods for biological oxygen demand estimation in wastewater.
Innovation Solution
A bio-electrochemical device using a consortium of specific bacteria immobilized on a charged nylon membrane, connected to an electrode and laptop workstation with software, measures BOD in wastewater by monitoring oxygen concentration changes, providing rapid and reproducible results.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If conventional BOD test methods are used, then measurement accuracy and reliability are maintained, but the testing time is excessively long (5 days)
Solution Approach 1:
The patent segments the BOD measurement process by separating the biological degradation function (performed by immobilized bacterial consortium on membrane) from the measurement function (electrochemical oxygen sensing). This allows parallel processing of multiple samples and eliminates the sequential waiting period required in conventional methods, reducing testing time from 5 days to hours while maintaining measurement reliability through the stable immobilized bacterial system.
Solution Approach 2:
The patent applies preliminary action by pre-immobilizing a standardized bacterial consortium on the membrane before sample analysis. This pre-prepared biological system is ready to immediately begin degradation when exposed to the sample, eliminating the incubation and acclimatization periods required in conventional BOD tests, thus significantly reducing testing time while ensuring consistent and reliable measurements.
2Ease of operation
If conventional BOD test methods are used, then comprehensive carbonaceous and nitrogenous oxygen demand measurement is achieved, but the process complexity and operational requirements increase
Solution Approach 1:
The patent extracts the complex chemical oxygen demand (COD) measurement step from the BOD determination process. By using an electrochemical oxygen sensor that directly measures dissolved oxygen consumption by immobilized bacteria, the method obtains BOD results without requiring separate COD analysis, titration procedures, or complex chemical reagents, thereby simplifying operational steps while maintaining measurement comprehensiveness.
Solution Approach 2:
The patent creates a universal measurement system where a single device with immobilized bacterial consortium can measure BOD for various wastewater types (domestic, industrial, beverage) without requiring different methodologies or additional equipment. The electrochemical sensor combined with the bacterial membrane provides a multi-functional platform that simplifies operation across diverse applications while maintaining process reliability.
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
The device enables quick and accurate BOD estimation in beverage wastewater, comparable to conventional methods, while excluding the need for COD analysis, and is portable for online monitoring at industrial sites.
Implementation Method 1
The BOD test is also interpreted as a measure of the concentration of organic material that can serve as a substrate to support the growth of microorganisms.
Implementation Method 2
the oxygen consumed by heterotrophic microorganisms is the carbonaceous BOD
Implementation Method 3
Biosensors are devices that transduce a selective biochemical response to a measurable signal
Data Source
Figure 1
AI summary
The present invention deals with a device for quick estimation of biochemical oxygen demand of beverage waste water. This device consists of an immobilized microbial membrane attached to an electrode, multimeter and a laptop workstation installed with a developed software. BOD measurement of beverage waste water using this device is rapid, reproducible and effective as compared to conventional titration based methods. This device also excludes COD estimation as required for BOD estimation of waste water. This bio-electrochemical device may find wide commercial application in beverage industries emanating waste waters.