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Shubiao Wu

Development and validation of a simplified titration method for monitoring volatile fatty acids in anaerobic digestion

Publikation: Bidrag til tidsskrift/Konferencebidrag i tidsskrift /Bidrag til avisTidsskriftartikelForskningpeer review

  • Hao Sun, China Agricultural University
  • ,
  • Jianbin Guo, China Agricultural University
  • ,
  • Shubiao Wu
  • Fang Liu, China Agricultural University
  • ,
  • Renjie Dong, China Agricultural University

The volatile fatty acids (VFAs) concentration has been considered as one of the most sensitive process performance indicators in anaerobic digestion (AD) process. However, the accurate determination of VFAs concentration in AD processes normally requires advanced equipment and complex pretreatment procedures. A simplified method with fewer sample pretreatment procedures and improved accuracy is greatly needed, particularly for on-site application. This report outlines improvements to the Nordmann method, one of the most popular titrations used for VFA monitoring. The influence of ion and solid interfering subsystems in titrated samples on results accuracy was discussed. The total solid content in titrated samples was the main factor affecting accuracy in VFA monitoring. Moreover, a high linear correlation was established between the total solids contents and VFA measurement differences between the traditional Nordmann equation and gas chromatography (GC). Accordingly, a simplified titration method was developed and validated using a semi-continuous experiment of chicken manure anaerobic digestion with various organic loading rates. The good fitting of the results obtained by this method in comparison with GC results strongly supported the potential application of this method to VFA monitoring.

TidsskriftWaste Management
Sider (fra-til)43-50
Antal sider8
StatusUdgivet - 1 sep. 2017
Eksternt udgivetJa

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