Continuous Dissolved Oxygen Measurement for Wastewater BOD Analysis
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Solution Overview
Problem
The current 5-day BOD test for wastewater treatment is time-consuming, imprecise, and requires skilled operation, leading to inefficient aeration control and increased energy costs due to the lack of real-time oxygen demand data, which is critical for optimizing biological treatment processes.
Innovation Solution
A system for continuous, real-time measurement of analytes such as oxygen and carbon dioxide in wastewater samples, allowing for immediate adjustment of aeration levels and reducing the need for frequent sampling, using a carousel or solid-state device with integrated temperature control and optical sensors to calculate BOD values.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the standard 5-day BOD test is used, then regulatory compliance is achieved, but the measurement time is excessively long and results are delayed
Solution Approach 1:
The system performs continuous dissolved oxygen measurements throughout the incubation period rather than single endpoint measurements, enabling real-time monitoring of oxygen consumption and calculation of BOD values at multiple time points including early predictions before the full 5 days elapse
Solution Approach 2:
The system calculates predictive BOD values during the incubation period based on early oxygen consumption trends, providing preliminary results that can guide operational decisions before the complete 5-day test concludes
2Reliability
If aeration levels are increased to ensure sufficient oxygen supply, then treatment reliability is improved, but energy consumption increases by 20-40%
Solution Approach 1:
The system provides real-time feedback on actual oxygen consumption rates and predictive BOD values, enabling operators to adjust aeration levels dynamically to match actual demand rather than using fixed conservative settings
Solution Approach 2:
The system enables dynamic adjustment of aeration operations based on real-time measurements and predictive modeling, allowing aeration levels to adapt to changing oxygen demand throughout the treatment process
3Measurement precision
If the 5-day incubation period is used, then complete BOD measurement is achieved, but temperature control stability becomes difficult to maintain
Solution Approach 1:
The system performs preliminary BOD calculations during the incubation period based on early oxygen consumption data, providing reliable results without requiring the full 5-day incubation period and its associated temperature control challenges
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 faster and more accurate BOD measurements, reducing energy costs by up to 6% and providing timely feedback for optimizing wastewater treatment processes, while maintaining compliance with EPA standards.
Implementation Method 1
an optode, positioned to measure the concentration of an analyte in a fluid sample
Implementation Method 2
a signal detector to detect a signal from the analyte detection site
Data Source
AI summary
Described herein is a system to provide continuously measurements of an analyte present in a fluid sample, particularly dissolved oxygen in wastewater. The system comprises a sample chamber absent of ambient light to contain the sample and in many embodiments employs a non-invasive method of measuring the analyte and determining the change over time in the concentration of the analyte. It is also an aspect of the invention to deliver analyte measurements in real-time and provides the operator with feedback in substantially less time after sample collection than previously accomplished in the field. It is another aspect of the invention to simultaneously or at least in a substantially short period of time thereafter measure temperature to remove initial error encountered at the start of analyte measurement at least until the sample chamber reaches thermal equilibrium.