AppliTek NV

- On-Line Anaerobic Control Analyzer



AnaSense is an on-line analyzer system designed specifically for monitoring anaerobic digesters, bringing the possibility of implementing new control alternatives to typical operating problems in anaerobic processes in mid to large scale digesters. The primary process parameter that can be measured is total volatile fatty acids (VFA). VFA levels directly represent the metabolic condition of the anaerobic digester and respond quickly to stress induced changes. Other critical process parameters are: bicarbonate, alkalinity (partial and total) and optionally ammonia.

Anaerobic digesters require critical parameter monitoring in order to obtain optimal production efficiency, compliance and biogas yield. However, due to the expensive or time-consuming character of most analysis methods for anaerobic digestion, industrial digesters are usually not extensively monitored and continuous measurement of a few parameters is used, such as pH and gas flow. This is the reason why the loading rate of the digester has to be kept relatively low for safety precautions.

Keeping the loading rate low is also a consequence of the inherent risk of digester failure due to “overfeeding”. Critical parameter monitoring allows to maintain a higher process set point without the risk of calamities due to an accumulation of the fatty acids. Operators sometimes experience too late that a single batch of commercially available granular sludge can be much more expensive than the purchase of an on-line analyzer. In this respect,AnaSense offers a viable return on investment for AD operators.

  • On-line, automatic measurements of volatile fatty acids (VFA), bicarbonate, alkalinity, pH and ammonia in one single run
  • Second generation design with less moving parts, simple maintenance and requiring no special analytical skills
  • Complete separation between electronics and wet part
  • Rapid results (10 – 15 min.) allow true process monitoring,protection and optimization
  • Dual range possibility for influent/effluent analysis
  • Multiplexing up to eight (8) sampling points possible
  • Incorporated industrial PC with AppliTek controller
  • Extended data communication and exchange features

Analysis method
  • Acid/base titration
  • Volatile fatty acids (total), bicarbonate, alkalinity
  • (total), alkalinity (partial), pH
  • Optional: ammonia
Standard measuring ranges
  • One combination, factory set:
  • VFA: 10 – 500 mg/L as acetate equivalent
  • Bicarbonate: 0-55 meq/L or 5,500 mg/L as CaCO3
  • Alkalinity *: 0-55 meq/L or 5,500 mg/L as CaCO3
  • VFA : 10 – 500 mg/L as acetate equivalent
  • Bicarbonate: 0-500 meq/L or 50,000 mg/L as CaCO3
  • Alkalinity *: 0-500 meq/L or 50,000 mg/L as CaCO3
  • VFA: 50 – 10,000 mg/L as acetate equivalent
  • Bicarbonate: 0-100 meq/L or 10,000 mg/L as CaCO3
  • Alkalinity *: 0-100 meq/L or 10,000 mg/L as CaCO3
*Alkalinity: as total and partial alkalinity

Standard measuring range (other)
  • One measuring range, factory set:
  • Ammonia: 2 – 3.5 g/L
Cycle time
  • 10 – 15 minutes (depending on range)

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