BM respirometry study about nitrification inhibition and actual aeration capacity in an activated sludge process case study

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Courtesy of SURCIS, S.L.

Study for municipal WWTP in Spain

This study is ordered to SURCIS as a consequence of the low process performance, practical absence of nitrification treatment.

By other side, the mixed-liquor presented some abnormal features such as weakness, dark colour and abundant white foaming.

Data for study interest

  • Aeration system: fine bubble diffusers + liquid oxygen injection
  • Ammonium concentration in ASP influent: 42 mg N-NH4/L
  • Ammonium concentration in effluent: 39 mg N-NH4/L
  • SVI: 65 mL/g
  • F/M: 0.078 kg BOD/kg MLVSS*d
  • Dissolved oxygen average in aeration tank: 0.02 mg/L
  • Kg O2/kWh in aeration system: 4 kg O2/kWh
  • Power installed in aeration system: 148 kW (37 kW x 4 units)
  • Kg O2/d supplied by the liquid-oxygen system: 3,030 kg O2/d

Respirometry system

This service was carried out by specialized SURCIS (Spain) personnel by means a BM-T respirometer system and some complementary reagents and instruments.

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