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Method for rapidly determining volatile fatty acid concentration in anaerobic reactor

A volatile fatty acid, anaerobic reactor technology, applied in the direction of chemical analysis by titration, can solve the problems of decreasing measurement accuracy and increasing experimental complexity.

Inactive Publication Date: 2013-08-07
UNIV OF SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are two common problems in the titration method reported in the previous literature.
One is to stir during the titration process, the dissolved CO in the sample 2 Due to the CO in the air 2 Balance, there is more or less a certain loss, which leads to the change of total inorganic carbon in the sample, which makes the measurement accuracy drop; second, in order to reduce the interference of other weak acid-base (such as phosphoric acid, etc.) buffer systems in the solution, it is often necessary to Determine its concentration, which undoubtedly increases the complexity of the experiment

Method used

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  • Method for rapidly determining volatile fatty acid concentration in anaerobic reactor
  • Method for rapidly determining volatile fatty acid concentration in anaerobic reactor
  • Method for rapidly determining volatile fatty acid concentration in anaerobic reactor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0059] At room temperature, 0.04 L of effluent from artificial synthesis reactors with phosphate concentrations of 0, 1, 3, and 6 mM and acetic acid concentrations of 5 mM were respectively configured.

[0060] ① Under the conditions of electromagnetic stirring at 300rpm and a drop rate of 0.7mL / min, add hydrochloric acid solution with a concentration of 0.05M to the effluent with a phosphate concentration of 0mM until the pH is 4.7, and record the volume at this time (V 0 =42.15*10 -3 L). Continue to titrate with 0.05M hydrochloric acid solution until the pH of the system is 4.2, and the amount of hydrochloric acid is V x =9.85*10 -4 L, the process takes up to 20 minutes.

[0061] With the calculation formula of the present invention:

[0062] C VFA = ( [ H + ] ...

Embodiment 2

[0074] At room temperature, respectively configure 0.04 L of artificially synthesized reactors with ammonium salt concentrations of 0, 1.5, 3, and 4 mM and acetic acid concentrations of 1 mM.

[0075] ① Under the conditions of electromagnetic stirring at 300rpm and a drop rate of 0.7mL / min, add hydrochloric acid solution with a concentration of 0.05M to the effluent with an ammonium salt concentration of 0mM until the pH is 4.7, and record the volume at this time (V 0 =40.53*10 -3 L); continue to titrate with a hydrochloric acid solution with a concentration of 0.05M until the pH of the system is 4.2, and the amount of hydrochloric acid is V x =2.16*10 -4 L, the process takes up to 20 minutes.

[0076] With the calculation formula of the present invention:

[0077] C VFA = ( [ H + ] ...

Embodiment 3

[0089] At room temperature, 0.04L of effluent from artificial synthesis reactors with sulfide ion concentrations of 0, 1, 3, and 6mM and acetic acid concentration of 1mM were respectively configured.

[0090] ① Under the conditions of electromagnetic stirring at 300rpm and a drop rate of 0.7mL / min, add hydrochloric acid solution with a concentration of 0.05M to the effluent with an ammonium salt concentration of 0mM until the pH is 4.7, and record the volume at this time (V 0 =40.54*10 -3 L); continue to titrate with a hydrochloric acid solution with a concentration of 0.05M until the pH of the system is 4.2, and the amount of hydrochloric acid is V x =2.23*10 -4 L, the process takes up to 20 minutes.

[0091] With the calculation formula of the present invention:

[0092] C VFA = ( [ H + ...

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Abstract

The invention provides a method for rapidly determining volatile fatty acid (VFA) concentration in an anaerobic reactor. According to the invention, according to charge balance and final-initial volumes of a solution requiring detection when two different pH points are established, the relationship between VFA and pH is calculated; and through an acid titration method, VFA concentration of the solution requiring detection can be calculated. The invention provides a method for rapidly determining volatile fatty acid (VFA) concentration in the anaerobic reactor. The method is fast, stable, accurate, simple, and the like. With the method, defects such as rough method and poor accuracy of a colorimetric method and a distillation method are solved, and defects of high cost and complicated operation of a chromatographic method are avoided. With the method, VFA rapid and precise on-line detection can be realized.

Description

technical field [0001] The invention relates to the technical field of wastewater biological treatment, in particular to a method for quickly measuring the concentration of volatile fatty acids in an anaerobic reactor. Background technique [0002] Volatile fatty acid (VFA) refers to fatty acids with 1-6 carbon atoms, mainly acetic acid, propionic acid and butyric acid in urban sewage / sludge. The normal operation of the anaerobic process requires that the acid production and methanogenesis of the system are in a dynamic balance to maintain a constant pH in the reactor (6.6-7.4). Otherwise, the accumulation of VFA will cause the pH value to be too low and cause the system to fail. Due to the existence of various buffer systems in the anaerobic reactor, the buffering effect made the accumulation of VFA to a certain extent unable to be reflected in time on the pH. Therefore, rapid and accurate measurement of VFA concentration has become a more effective method for anaerobic r...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N31/16
Inventor 穆杨何传书母哲轩王亚洲杨厚云俞汉青
Owner UNIV OF SCI & TECH OF CHINA
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