Centrum WWTP, Dabrowa-Gornicza Poland




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Improvement of anaerobic digestion by ultrasound technology

Brief snapshot of the plant

  • Design capacity: 150.000 PE
  • Actual loading: 200.000 PE (Overloading conditions)
  • Biological wastewater treatment: Simultaneous denitrification and nitrification, Bio-P-Elimination
  • Sludge treatment: No primary sludge, thickened waste activated sludge (TWAS)
  • Separate waste activated sludge thickening: Drum thickener (operating 14h/d)
  • Sludge stabilisation: Two digesters (2 x 1,680 m), mesophilic
  • Biogas: Production: 438.000 m/a, 66% capacity of the CHP used
  • Digested sludge dewatering: Band filter press


Objective of the ultrasound disintegration system

  • Increase of biogas production
  • Improvement of volatile solids destruction
  • Eliminate the need for the construction of a new digester


Preliminary trial of the ultrasound disintegration system

  • Test phase of five months (February 2009 June 2009)
  • The recirculated digested sludge -concerning 30% of the total daily TWAS flow- was treated with 2 units 5kW-ULTRAWAVES US, operating 14 hours per day


Current Cetrum WWTP Sludge Flow Sheet



  • Biogas production: 28% increased biogas production
  • Volantile solid degradation: Volatile solids concentration (as % of DS) was reduced from 70% to 65%


Volatile Solids Concentrations in Digested Sludge


Biogasproduction of Anaerobic Digester Jan May 09


Payback time

Based on these results, the payback time for the ultrasound installation is calculated with 2 years. No need for the construction of a new digester.


Full-scale Installation

In July 2009 the ULTRAWAVES ultrasonic reactor was implemented on Centrum WWTP. And since is in operation 14 hours per day.


Installed ultrasonic reactor

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