Derived Alkalinity Analyzer for Simultaneous TOC Measurement
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Solution Overview
Problem
Conventional methods for measuring alkalinity and total organic carbon (TOC) in aqueous samples face limitations such as the use of hazardous reagents, safety hazards, incomplete measurement of oxidized carbon species, and the inability to simultaneously determine both parameters, leading to potential overuse of disinfection chemicals and formation of disinfection by-products (DBPs).
Innovation Solution
A method and system utilizing an electrochemical cell with a SP3 substituted carbon electrode doped with a conductivity elevating composition, combined with a metallic catalyst, to oxidize organic compounds to carbon dioxide, allowing simultaneous measurement of alkalinity and TOC, eliminating the need for ozone and oxygen concentrators, and enabling real-time control of chemical addition to minimize DBP formation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional methods are used to measure alkalinity and TOC, then measurement capability is provided, but hazardous reagents are required and safety hazards exist
Solution Approach 1:
The patent replaces conventional chemical titration methods with an electrochemical measurement system. An electrochemical cell with a working electrode, reference electrode, and counter electrode measures alkalinity through electrochemical reactions, eliminating the need for hazardous chemical reagents while maintaining measurement capability
Solution Approach 2:
The patent introduces a non-aqueous electrolyte as an intermediary medium in the electrochemical cell. This electrolyte enables ionic conduction and electrochemical reactions without requiring hazardous aqueous reagents, serving as a safe mediator between the electrodes and the sample
2Measurement precision
If conventional sequential measurement methods are used, then alkalinity and TOC can be determined, but simultaneous measurement capability is lost leading to overuse of disinfection chemicals
Solution Approach 1:
The patent merges the alkalinity measurement cell and TOC measurement system into a single integrated apparatus. Both measurements occur in the same sample stream using shared components (pumps, flow cells, detectors), enabling simultaneous determination of alkalinity and TOC without sequential processing
Solution Approach 2:
The patent creates a multi-functional measurement system where a single apparatus performs both alkalinity measurement (via electrochemical cell) and TOC measurement (via oxidation and detection). The system uses universal components like pumps, flow cells, and data processing units for both measurement functions
3Measurement precision
If conventional TOC measurement methods are used, then organic carbon can be measured, but incomplete measurement of oxidized carbon species occurs
Solution Approach 1:
The patent employs a strong oxidation system using a catalyst (such as manganese dioxide) and oxidizing conditions to completely convert all organic carbon species to carbon dioxide. This ensures complete oxidation of even recalcitrant organic compounds, eliminating incomplete measurement of oxidized carbon species
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 accurate and simultaneous measurement of alkalinity and TOC, optimizing chemical use and reducing DBP formation, thereby ensuring water quality and compliance with regulatory limits while reducing costs and safety risks.
Implementation Method 1
applying, using a generator of the analyzer, a positive potential to the SP3 substituted carbon electrode, the positive potential being sufficient to oxidize organics in the fluid sample to produce carbonate and partially oxidized organics
Implementation Method 2
introducing, prior to or substantially simultaneously during the application of the positive potential to the SP3 substituted carbon electrode and in the reaction chamber, at least one acid reagent comprising a metallic catalyst that converts the carbonate and the partially oxidized species to carbon dioxide
Implementation Method 3
measuring, using a pH sensor of the analyzer, a pH of the fluid sample, wherein the pH of the fluid sample correlates to a hydroxide amount of the fluid sample
Implementation Method 4
measuring, using a phosphate analyzer of the analyzer, a phosphate amount of the fluid sample using a colorimetric reagent
Implementation Method 5
determining total organic carbon by detecting, using at least one detector of the analyzer, an amount of carbon dioxide produced by the oxidation
Data Source
AI summary
An embodiment provides a method for deriving an alkalinity measurement, including: introducing a fluid sample; measuring, a phosphate amount of the fluid sample using a colorimetric reagent; measuring a pH of the fluid sample, wherein the pH of the fluid sample correlates to a hydroxide amount of the fluid sample; introducing an acid to convert all the inorganic carbon to carbon dioxide; applying a positive potential to the SP3 substituted carbon electrode; introducing, prior to or substantially simultaneously during the application of the positive potential to the SP3 substituted carbon electrode and in the reaction chamber, at least one acid reagent comprising a metallic catalyst that converts the carbonate and the partially oxidized species to carbon dioxide; determining total organic carbon by detecting an amount of carbon dioxide produced by the oxidation; determining the total organic carbon from the oxidation of the organic carbon species, and determining a derived alkalinity based upon the phosphate amount, the hydroxide amount, and the amount of carbon dioxide generated from the inorganic carbon. Other aspects are described and claimed.