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High-Rate Partial Nitritation of Municipal Wastewater after Psychrophilic Anaerobic Pretreatment

V. Kouba, D. Vejmelkova, E. Proksova, H. Wiesinger, M. Concha, P. Dolejs, J. Hejnic, P. Jenicek, J. Bartacek,

. 2017 ; 51 (19) : 11029-11038. [pub] 20170914

Jazyk angličtina Země Spojené státy americké

Typ dokumentu časopisecké články

Perzistentní odkaz   https://www.medvik.cz/link/bmc18024705

Partial nitritation/anammox can provide energy-efficient nitrogen removal from the main stream of municipal wastewater. The main bottleneck is the growth of nitrite oxidizing bacteria (NOB) at low temperatures (<15 °C). To produce effluent suitable for anammox, real municipal wastewater after anaerobic pretreatment was treated by enriched ammonium oxidizing bacteria (AOB) in suspended sludge SBR at 12 °C. NOB were continually washed out using aerobic duration control strategy (ADCS). Solids retention time was set to 9-16 days. Using this approach, average ammonia conversion higher than 57% at high oxidation rate of 0.4 ± 0.1 kg-N kg-VSS-1 d-1 was achieved for more than 100 days. Nitrite accumulation (N-NO2-/N-NOX) of 92% was maintained. Thus, consistently small amounts of present NOB were efficiently suppressed. Our mathematical model explained how ADCS enhanced the inhibition of NOB growth via NH3 and HNO2. This approach will produce effluent suitable for anammox even under winter conditions in mild climates.

Citace poskytuje Crossref.org

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