Ammonia Nitrogen Detection via Nitrification Biological Reaction
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Solution Overview
Problem
Existing methods for detecting ammonia nitrogen in water bodies suffer from poor measurement stability and accuracy, and often result in environmental pollution due to the use of toxic chemicals and generation of hazardous waste.
Innovation Solution
A method utilizing a nitrification biological reaction, where nitrifying microorganisms are cultured and acclimated to form a membrane that consumes ammonia, allowing for indirect detection of ammonia nitrogen content by measuring dissolved oxygen levels, eliminating the need for toxic reagents and reducing waste production.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If Nessler's reagent spectrophotometry is used for ammonia nitrogen detection, then the detection can be performed with simple equipment, but the measurement stability and accuracy deteriorate due to interference from temperature, chromaticity, turbidity, and color development time
Solution Approach 1:
The patent replaces chemical spectrophotometric methods with a biological nitrification-based detection system. Nitrifying bacteria are used to convert ammonia nitrogen to nitrate nitrogen, and the process is monitored through pH changes or oxygen consumption measurements, eliminating the need for chemical reagents and spectral analysis equipment.
Solution Approach 2:
The patent introduces nitrifying bacteria as an intermediary biological agent that mediates the conversion of ammonia nitrogen. The bacteria serve as a biological catalyst that transforms the target substance, allowing indirect measurement through pH or oxygen changes rather than direct chemical reaction with dyes.
2Ease of manufacture
If Nessler's reagent spectrophotometry is used, then the detection method can be established, but environmental pollution increases due to toxic mercury iodide reagent and waste liquid
Solution Approach 1:
The patent converts the harmful chemical reagents into beneficial biological agents. Instead of using toxic mercury-containing Nessler's reagent, nitrifying bacteria are employed which naturally occur in the environment and convert ammonia nitrogen through biological nitrification, transforming a chemical harm into a biological benefit.
Solution Approach 2:
The nitrifying bacteria used in the detection method are self-sustaining biological agents that can be cultured and maintained without requiring toxic chemical inputs. The system uses the bacteria's natural metabolic processes to perform the detection, eliminating the need for external toxic reagents and producing minimal waste.
3Illumination intensity
If salicylic acid-hypochlorite spectrophotometry is used, then ammonia nitrogen concentration can be measured with strong absorbance, but measurement accuracy deteriorates due to interference from metal ions, turbidity, and chromaticity
Solution Approach 1:
The patent replaces optical spectrophotometric measurement with biological conversion measurement. Instead of measuring light absorbance of colored compounds, the system measures pH changes or oxygen consumption during biological nitrification, eliminating optical interference from metal ions, turbidity, and chromaticity.
4Measurement precision
If ammonia gas-sensitive electrode method is used, then ammonia nitrogen concentration can be measured with linear relationship, but reliability deteriorates due to equipment corrosion from strong alkali and short service life
Solution Approach 1:
The nitrifying bacteria system is self-sustaining and can be cultured and maintained without requiring protective measures against corrosion. The biological agents naturally adapt to the detection environment and can be replenished by simple cultural methods, eliminating the need for complex anti-corrosion equipment and maintenance.
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 provides accurate, stable, and environmentally friendly ammonia nitrogen detection with high reliability, minimizing interference from water chromaticity and suspended matters, and maintaining long-term sensor stability.
Implementation Method 1
utilizing a nitrification biological reaction, where nitrifying microorganisms are cultured and acclimated to form a membrane that consumes ammonia
Implementation Method 2
the ammonia nitrogen content in a water body is indirectly determined by using the indirect relationship between the amount of ammonia consumed during nitrification reactions in microorganisms and the dissolved oxygen in the water body
Data Source
AI summary
Provided is a method for detecting ammonia nitrogen content by using a nitrification biological reaction. In the present disclosure, the nitrifying microorganisms have high specificity for ammonia nitrogen, a metabolism and oxygen consumption capacity closely related to the ammonia nitrogen concentration, high accuracy and high sensitivity of ammonia nitrogen detection, and are not easily disturbed by water body chromaticity, suspended matters, and the like. In addition, the activity of the nitrification microorganism membrane reactor can be kept stable for a long term, and the stability of a sensor is good for long-term use. In the present disclosure, with a mono-component or multi-component solution containing inorganic nitrogen and inorganic carbon as a nitrification nutrient solution, a nitrification microorganism membrane with strong adaptability to the environment, a stable structure, a high selectivity for ammonia nitrogen, and an ability of efficiently degrading ammonia nitrogen can be obtained.