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Pedrouso, A.; Morales, N.; Rodelas, B.; Correa-Galeote, D.; del Rio, A.V.; Campos, J.L.; Vazquez-Padin, J.; Mosquera-Corral, A. |
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Title |
Rapid start-up and stable maintenance of the mainstream nitritation process based on the accumulation of free nitrous acid in a pilot-scale two-stage nitritation-anammox system |
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2023 |
Publication |
Separation And Purification Technology |
Abbreviated Journal |
Sep. Purif. Technol. |
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317 |
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123851 |
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Keywords |
Ammonium oxidising bacteria (AOB); Anammox; Municipal wastewater treatment; Nitrite oxidising bacteria (NOB) suppression; PN; AMX pilot plant |
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Abstract |
Two-stage partial nitritation (PN) and anammox (AMX) systems showed promising results for applying auto-trophic nitrogen removal under mainstream conditions. In this study, a pilot-scale (600 L per reactor) two-stage PN/AMX system was installed in a municipal wastewater treatment plant (WWTP) provided with a high-rate activated sludge (HRAS) system for organic carbon removal. The PN/AMX system was operated without tem-perature control (ranging from 11 to 28 degrees C) and was subjected to the same variations in wastewater charac-teristics as the WWTP (22 to 63 mg NH4+- N/L). The developed strategy is simple, does not require the addition of chemicals and is characterised by short start-up periods. The PN process was established by applying a high hydraulic load and maintained by in situ accumulated free nitrous acid (FNA) of 0.015-0.2 mg HNO2-N/L. Based on pH value, a controlled aeration strategy was applied to achieve the target nitrite to ammonium ratio in the effluent (1.1 g NO2--N/g NH4+-N) to feed the AMX reactor. Although NOB were not fully washed out from the system, nitrite accumulation remained (>99 %) stable with no evidence of NOB activity. In the AMX reactor, an overall nitrogen removal efficiency of 80 % was achieved. Regarding effluent quality, 12 +/- 3 mg TN/L was obtained, but 5 mg NO3--N/L was already in the HRAS effluent. The relative abundance of NOB showed a strong negative correlation with the FNA concentration, providing a good strategy for establishing PN under main-stream conditions. |
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1383-5866 |
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WOS:001007409900001 |
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UAI @ alexi.delcanto @ |
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1821 |
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