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Online headspace chromatographic method for measuring VFA in biogas reactors

Online headspace chromatographic method for measuring VFA in biogas reactors. Kanokwan Boe, Damien John Batstone, Irini Angelidaki Environment & Resources Technical University of Denmark Lyngby, Denmark. Traditional monitoring. Optimal monitoring. Good indicator.

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Online headspace chromatographic method for measuring VFA in biogas reactors

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  1. Online headspace chromatographic method for measuring VFA in biogas reactors Kanokwan Boe, Damien John Batstone, Irini Angelidaki Environment & Resources Technical University of Denmark Lyngby, Denmark

  2. Traditional monitoring

  3. Optimal monitoring

  4. Good indicator • To indicate the actual status of the process • To give an early warning • To give a secure warning • To always predict imbalance

  5. Types of disturbances • Hydralic overload • Organic overload • Toxic compounds • Temperature changes • pH change • New substrates

  6. Traditional indicators

  7. Alternative indicators

  8. Background • Co-digestion plants • Need of on-line monitoring system • VFA as process indicator • Digested manure => problem with filtration

  9. Concept • Gas phase extraction • Liquid sample => measure in gas phase • High solid sample / slurry waste • No pretreatment or filtration needed • Individual VFA in liquid phase

  10. Gas-liquid extraction factor • Strong effect : • pH • Temperature • Salt addition • No effect : • Gas/Liquid volume ratio • VFA concentration

  11. Sample Acid Salt Concept GC H pH T Equilibrium cell

  12. System setup

  13. System setup

  14. Gas chromatogram of digested manure But Iso-but Iso-val Pr Val Ac Iso-val But Iso-but Pr Val Ac From gas sample From liquid sample

  15. Environment & Resources Technical University of Denmark Test on standard VFA solution

  16. Preliminary test online application Acetic acid Propionic acid Peak area from on-line measurement VFA conc. in liquid phase from off-line measurement Iso-butyric acid

  17. Conclusion • New online-VFA by gas extraction from liquid sample • pH < 2, Temperature > 65oC • Linear calibration curve in application range • Measure individual VFA • No pretreatment or filtration needed

  18. Acknowledgement • Technicians : Uwe Albert Walter Majbrit Staun Jensen • Students : Elena Fernández Ordáz Mickael Serres

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