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| Enhanced ammonia removal rate in a pilot-scale MBBR |
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Abstract A combined pilot-scale MBBR process was used for treatment of the wastewater in the Buji River in Shenzhen city. The averaged influent and effluent ammonia nitrogen concentrations were (25.88±7.73) mg/L and (1.11±1.93)mg/L, respectively. The results of the single factor experiments show that the biofilm fillers enhanced the ammonia removal and increased the specific ammonia oxidation rate by 25.5% to activated sludge. The specific rate decreased from 2.55mg/(gMLVSS·h) to 1.91mg/(gMLVSS·h) with the COD increasing from 139mg/L to 587mg/L, decreased from 8.24mg/(gMLVSS·h) to 1.93mg/(gMLVSS·h) with the MLVSS increasing from 0.45g/L to 4.05g/L, increased from 0.99mg/(gMLVSS·h) to 2.89mg/(gMLVSS·h) with the temperature increasing from 5℃ to 35℃ and increased from 0.62mg/(gMLVSS·h) to 2.28mg/(gMLVSS·h) with the DO concentration increasing from 0.5mg/L to 4.0mg/L, respectively. However, the volume ammonia oxidation rate increased linearly from 3.68mg/(L·h) to 7.82mg/(L·h) with the increased MLVSS (R2 = 0.967). The Arrhenius experience equation was used to describe the influence of temperature (R2 = 0.970). The Monod equation fitted the process well (R2 = 0.994) and the estimated half saturation constant of ammonia oxidation was 3.0mg O2/L.
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Received: 03 January 2012
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