Fluorescence Detection of Landfill Leachate Groundwater Pollution
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Solution Overview
Problem
Current methods for monitoring groundwater pollution from landfill leachate are time-consuming, costly, and limited in their ability to detect complex organic pollutants, particularly due to the need for chemical reagents and complex sample pretreatment procedures in conventional index analysis and chromatographic detection.
Innovation Solution
A rapid detection method using fluorescence spectroscopy that establishes characteristic fluorescence spectrum regions and intensities to determine pollution levels in groundwater, allowing for on-site detection with a portable fluorescence detector without the need for chemical reagents, enabling quick identification of landfill leachate pollution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional index analysis or chromatographic detection is used to analyze organic matter, then composition and structure can be analyzed, but complex sample pretreatment and chemical reagents are required which produce pollutants and increase complexity
Solution Approach 1:
The patent replaces conventional mechanical/chemical analysis methods (index analysis and chromatographic detection) with fluorescence spectral detection technology. This substitution eliminates the need for complex sample pretreatment and chemical reagents while maintaining the ability to analyze organic matter composition and structure through fluorescence characteristics
Solution Approach 2:
The patent introduces fluorescence spectral characteristics as an intermediary to detect organic pollutants. By measuring fluorescence intensity at specific excitation and emission wavelengths, the method indirectly detects the presence and concentration of aromatic hydrocarbons without direct chemical interaction, thus avoiding complex pretreatment and reagent use
2Productivity
If spectral detection technology is used, then no chemical reagents are needed and detection is rapid, but the leachate contains benzene pollutants with strong spectral characteristics requiring specific wavelength detection
Solution Approach 1:
The patent applies local quality by focusing detection on specific local characteristics of the fluorescence spectrum - namely, specific excitation wavelengths (210-280nm) and emission wavelengths (300-500nm) where aromatic hydrocarbons exhibit characteristic fluorescence. This targeted approach at specific spectral regions enables rapid detection without requiring analysis of the entire spectrum
3Measurement precision
If three-dimensional fluorescence spectrum is obtained for water quality monitoring, then fluorescence features can be analyzed, but cumbersome procedures such as sample pretreatment, detection, and data processing are required
Solution Approach 1:
The patent extracts only the essential fluorescence intensity data at specific excitation and emission wavelength pairs from the complete three-dimensional fluorescence spectrum. By taking out only the relevant two-dimensional slice (specific Ex/Em combinations) that contain information about aromatic hydrocarbons, the method maintains measurement precision while dramatically reducing data processing complexity and time
Solution Approach 2:
The patent applies partial action by performing fluorescence detection at selected specific wavelength pairs rather than acquiring and processing the entire three-dimensional fluorescence spectrum. This partial measurement approach provides sufficient information for detecting aromatic hydrocarbon pollution while avoiding the cumbersome procedures associated with complete 3D spectral analysis
4Productivity
If on-line monitoring system is used, then simple indexes such as conductivity and pH can be monitored, but high price and high maintenance cost are incurred and complex indexes cannot be monitored
Solution Approach 1:
The patent applies universality by using fluorescence spectral detection technology that can monitor multiple types of organic pollutants simultaneously through a single detection system. By adjusting excitation and emission wavelengths, the same device can detect different aromatic hydrocarbons and other organic matter, providing multi-functional monitoring capability that exceeds conventional on-line systems while reducing overall cost
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 method allows for rapid, sensitive, and cost-effective detection of groundwater pollution, completing the analysis within 15 minutes and providing high detection sensitivity, overcoming the limitations of existing technologies by simplifying the detection process and reducing operational costs.
Implementation Method 1
The leachate contains a large amount of benzene pollutants which are monocyclic and polycyclic aromatic hydrocarbons, and has strong spectral characteristics, particularly fluorescence and ultraviolet characteristics, so that the ultraviolet and fluorescence spectra are characterized by simple, convenient and rapid detection in composition analysis of organic matters.
Data Source
AI summary
Provided are a rapid detection method for a condition of landfill leachate polluting groundwater and an application thereof. The rapid detection method includes: carrying out fluorescence detection on groundwater in a specific region of a landfill, and determining whether the groundwater is polluted according to a ratio of fluorescence intensities at specific excitation/emission wavelengths in a specific fluorescence region. The rapid detection method provided by the solution establishes characteristic fluorescence spectrum regions, fluorescence intensities and regular characteristics thereof of organic matters in leachate-polluted groundwater of a landfill in a fluorescence spectrum region, and can achieve the rapid detection of a condition of landfill leachate polluting groundwater by means of a portable fluorescence detector on site. The detection method provided by the solution is characterized by rapid detection, no need of chemical reagents, simple operation, high detection sensitivity and lower cost.