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Shubiao Wu

Automatic titrator for measurement of total volatile fatty acids and total inorganic carbon in scaled biogas project

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  • Shubiao Wu
  • Xinying Chen, China Agricultural University
  • ,
  • Liang Liu, China Agricultural University
  • ,
  • Jianbin Guo, China Agricultural University
  • ,
  • Renjie Dong, China Agricultural University

In order to monitor and early warn the operational stability of anaerobic fermentation system timely and effectively, an automatic titrator for monitoring total volatile fatty acids (VFA) and alkalinity in term of total inorganic carbon (TIC) concentration in scaled biogas project was designed following the principle of Nordmann titration method. The titrator was designed based on the LabVIEW software. It can not only accurately measure the concentration of VFA and bicarbonate alkalinity, but also achieve the functions of automatic pH meter calibration, automatic titration and rehydration, generating, displaying, storing titration data and curving in real-time, etc. with the support of the host application software. The titrator was tested for examining its properties by titrating the artificially prepared mixed analog sample solution and anaerobically digested pig manure slurry. The results showed that the achieved relative standard deviations of VFA and TIC concentration in both the mixed analog sample solution and the digested pig manure slurry were less than 5%, which were lower than those in manual titration and indicated a higher measurement accuracy. Additionally, it can effectively avoid man-made error in process of traditional manual titration, improve work efficiency and reduce labor intensity. Moreover, even in the continuous long run for 15 h, the titration results were stable, indicating titrator's operational stability and good performance. The results indicated that the automatic titrator would have an important practical application value for the biogas project.

TidsskriftNongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
StatusUdgivet - 25 sep. 2015
Eksternt udgivetJa

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