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A method and system for determining the content of volatile organic acids

A volatile organic acid and content technology, applied in the direction of chemical analysis by titration, can solve the problems of affecting the measurement, complicated and complicated, and achieve the effects of improving efficiency, accurate measurement results, and fast and real-time measurement process.

Active Publication Date: 2021-11-26
GUANGZHOU HKUST FOK YING TUNG RES INST
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Problems solved by technology

Due to the complexity of the anaerobic digestion system, there are often different weak acids in the sample, which seriously affects the determination based on the titration method
Thanks to the understanding of titration theory, five-point titration and eight-point titration can effectively reduce the influence of other weak acids on the determination, but this also makes these two methods cumbersome and complicated

Method used

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  • A method and system for determining the content of volatile organic acids
  • A method and system for determining the content of volatile organic acids
  • A method and system for determining the content of volatile organic acids

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] Configure the sample to be tested according to the theoretical concentration of acetic acid (HAc) shown in Table 1 below, then take 50ml of the sample and quickly transfer it to a cylindrical glass titration bottle with a diameter and height of 0.05 meters to become a solution to be titrated. Connect the pH meter into the titration bottle to measure the pH value of the solution in the titration bottle. One end of the pump tube of the peristaltic pump is inserted into the storage bottle filled with 0.01mol / L hydrochloric acid, and the other end is connected to the titration bottle, and pumped into the titration bottle Drop in hydrochloric acid and carry out titration, the rate of addition is 2ml / min. The pH meter transmits the measured pH value to the computer every 5 seconds, and the titration stops when the pH value of the sample is lower than 3.5. Use the calculation module in the computer to match the corresponding time and pH value with the change of the buffer stre...

Embodiment 2

[0054] In a lab-scale set of anaerobic batch reactors, samples were taken every half hour for four hours. The changes of the volatile organic acid content in the reactor were continuously monitored by the five-point titration method and the method of the present application respectively.

[0055] Take 10 milliliters of samples each time, quickly transfer them to a cylindrical glass titration bottle with a diameter and a height of 0.05 meters, add water to dilute to 50 milliliters, and prepare the solution to be titrated. Connect the pH meter to the titration bottle to measure the pH value of the solution in the titration bottle. One end of the pump tube of the peristaltic pump is inserted into the storage bottle filled with 0.01mol / L dilute sulfuric acid, and the other end is connected to the titration bottle to start the titration. Dilute sulfuric acid was added dropwise into the bottle for titration at a rate of 2ml / min. The pH meter transmits the corresponding time and mea...

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Abstract

The invention provides a method for determining the content of volatile organic acids, comprising: loading the solution to be titrated into a titration container, connecting a titration device and a pH measurement module to the titration container, and using the titration device to drop a strong acid titration solution into the titration container Perform titration, measure the pH value of the solution to be titrated in the titration container in real time through the pH measurement module during the titration process, and output the measured pH value to the calculation module connected with the pH measurement module, the measured pH value is lower than the pH x When the titration stops; the calculation module records the received pH value and the corresponding measurement time, and calculates the volatile organic acid content A according to the formula (1)(2)(3) T . The method of the invention is simple to operate, economical and practical, the measurement process is fast and real-time, the measurement result is accurate, and the error is small. Through the rapid monitoring of the method of the invention, the efficiency of the anaerobic digestion system can be significantly improved. The invention also provides a system for determining the content of volatile organic acids.

Description

technical field [0001] The invention relates to the technical field of anaerobic treatment of environmental engineering, in particular to a method and system for measuring the content of volatile organic acids. Background technique [0002] Anaerobic digestion is a mature biological treatment technology that can efficiently treat organic waste and convert it into biogas for energy recovery. However, the application of this technology is affected by many parameters of the system. Therefore, online real-time monitoring of various parameters of the anaerobic digestion system, such as volatile organic acid content, temperature, etc., can effectively ensure system stability and good operating results. [0003] Volatile organic acids, as the main metabolic intermediates in the anaerobic digestion system, are important electron donors and play an important role in the generation of biogas. Excessively high volatile organic acid content will lead to a decrease in pH, which will det...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N31/16
CPCG01N31/16
Inventor 昝飞翔郝天伟迟堃陈光浩
Owner GUANGZHOU HKUST FOK YING TUNG RES INST
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