Water Toxicity Detection Using Sulfur-Oxidizing Bacteria
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Solution Overview
Problem
Existing water toxicity detection methods using sulfur-oxidizing bacteria face challenges such as inaccurate measurements due to air bubbles, ineffectiveness in highly purified water, and the need for reactor reactivation when bacteria are inactivated, leading to disrupted continuous detection.
Innovation Solution
An apparatus with a microbial reactor and a separate measurement unit to prevent air bubble interference, a pH-adjusting unit for maintaining optimal pH, and an auxiliary reactor for continuous toxicity detection even when the primary reactor's bacteria are inactivated.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If measurement units are placed inside the microbial reactor, then pH and EC values can be measured, but air bubbles generated by aeration cause fluctuations in measured values
Solution Approach 1:
The system is divided into two separate units: a microbial reactor for biological oxidation and a measurement unit for detecting pH and EC values. This segmentation prevents air bubbles generated in the reactor from interfering with measurements, while still allowing continuous monitoring of water quality parameters through connected measurement chambers.
Solution Approach 2:
A measurement chamber acts as an intermediary between the microbial reactor and the measurement electrodes. Water flows from the reactor through this chamber, allowing indirect measurement of pH and EC values without exposing the electrodes directly to air bubbles generated during aeration in the reactor.
2Adaptability or versatility
If sulfur-oxidizing bacteria are used in highly purified water, then toxicity detection can be performed, but the bacteria require carbon dioxide and nutrients that are absent in highly purified water
Solution Approach 1:
Nutrient solution containing carbon dioxide, nitrogen, phosphorus, and potassium is supplied to the microbial reactor before introducing highly purified water samples. This preliminary action ensures that sulfur-oxidizing bacteria have the necessary nutrients to remain active and perform toxicity detection in purified water that would otherwise lack these essential substances.
3Reliability
If sulfur-oxidizing bacteria are inactivated by toxic substances, then toxicity detection is completed, but continuous detection in additional water samples becomes impossible
Solution Approach 1:
When sulfur-oxidizing bacteria become inactivated by toxic substances, the system discards the depleted sulfur particles and recovers by introducing fresh sulfur particles with active bacteria. This allows continuous toxicity detection across multiple water samples, as the reactivation process is streamlined through ready-to-use sulfur particle replacements rather than lengthy bacterial reactivation procedures.
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 setup ensures accurate and continuous detection of water toxicity by minimizing air bubble impact, accommodating various water types, and maintaining bacterial activity, thereby providing stable and reliable measurement results.
Implementation Method 1
a microbial reactor comprising a reactor body which contains sulfur-oxidizing bacteria and in which sulfur particles are oxidized by the sulfur-oxidizing bacteria in the presence of oxygen to form sulfate ions
Implementation Method 2
electrical conductivity is measured by placing two metals (electrodes) at a distance from each other in ion-containing water, applying voltage across the electrodes and measuring the generated current
Data Source
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AI summary
The present invention relates to an apparatus for detecting toxicity in water using sulfur-oxidizing bacteria, in which air and a water sample are introduced into a reactor containing sulfur-oxidizing bacteria and sulfur particles, and then the amount of sulfuric acid resulted from oxidation of the sulfur particles by the sulfur-oxidizing bacteria is analyzed based on the pH and electrical conductivity (EC) of the water sample, thereby detecting toxicity in the water sample. In the apparatus, the measured values of pH and electrical conductivity (EC) are not affected by air bubbles generated when the air and the water sample are introduced into the reactor, and the activity of the sulfur-oxidizing bacteria is not adversely affected by the pH of the water sample, so that accurate measurement results can be obtained. In addition, the apparatus comprises a plurality of reactors, and thus can continuously perform the detection of toxicity.