TOC Standard Particles From Freeze-Dried Sludge for Suspended Solids
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Solution Overview
Problem
Conventional water quality management indicators like BOD and COD fail to accurately reflect the total amount of pollutants and their properties due to increased non-point source pollutants and toxic substances, leading to inaccurate and unreliable total organic carbon (TOC) measurements in water samples containing suspended particles, which cause device clogging and reduce analysis accuracy and reproducibility.
Innovation Solution
A method for preparing a standard particle for TOC analysis using environmentally similar matrix samples, involving steps like supernatant separation, freeze-drying, grinding, sieving, and homogenization, to create a standard particle suitable for quality control, particularly from sewage sludge, ensuring stability and accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional indicators like BOD and COD are used for water quality management, then the measurement process is simple and well-established, but they fail to accurately reflect the total amount of pollutants and their various properties in modern water systems
Solution Approach 1:
The patent transitions from measuring oxygen demand (BOD/COD) to measuring total organic carbon content, changing the measurement parameter from chemical oxygen consumption to carbon quantification. This parameter change enables accurate reflection of all organic pollutants including non-degradable substances, while maintaining manageable measurement complexity through established TOC instrumentation.
2Measurement precision
If total organic carbon analysis is performed on water samples containing suspended particles, then comprehensive pollutant assessment is achieved, but the suspended particles cause incomplete oxidation, device clogging, and accumulation in the oxidation column, reducing measurement accuracy and reproducibility
Solution Approach 1:
The patent implements preliminary separation of suspended particles from water samples before TOC analysis. By removing particulate matter in advance through filtration or centrifugation, the sample is prepared to prevent clogging of device conduits and accumulation in the oxidation column during subsequent analysis, thereby ensuring complete oxidation and reproducible results.
3Reliability
If quality control standards are established for samples containing suspended particles, then measurement reliability is improved, but separate quality control standards are required for different sample types, increasing system complexity
Solution Approach 1:
The patent develops a universal quality control approach using certified reference materials that can be applied across different sample types containing suspended particles. Instead of creating separate quality control standards for each sample category, a single standardized reference material system is established that provides consistent quality assurance for TOC measurements regardless of the specific matrix, thereby reducing the number of required standards while maintaining 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 standard particle enhances the accuracy and reproducibility of TOC analysis by mimicking actual environmental samples, improving sample handling, pretreatment, and device setup, thereby enhancing wastewater treatment process efficiency and carbon cycle mass balance assessment.
Implementation Method 1
a step of cooling and freeze-drying a target sample
Implementation Method 2
cooling and freeze-drying a target sample
Data Source
AI summary
A method of preparing a standard particle for quality control in a total organic carbon analysis, includes: selecting and collecting a target sample of an environmentally similar matrix from an environmental sample, separating a supernatant from the target sample, cooling and freeze-drying a target sample, from which the supernatant has been separated, powdering the freeze-dried target sample by grinding, obtaining a homogenized particle sample by sieving the powdered target sample, and performing selection of a standard particle by evaluating the obtained particle sample.