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摘要
The anaerobic ammonium oxidation (anammox) activity was evaluated using sludge obtained from the rhizome of Typha sp., found in a natural wetland localized in the Jose Antonio Alzate dam, Toluca Valley, Mexico. Five NO2--N concentrations (15, 30, 50, 70 and 100 mg/L) were evaluated and the ammonium remained constant at 100 10 mg N/L. All cultures presented a lag phase in the ammonium consumption. Nevertheless, after the phase lag the ammonium oxidation was linked to nitrite reduction, producing N-2. The nitrite consumption efficiencies for the concentrations evaluated from 15 to 50 mg/L of NO2--N were above 95%, while the ammonium consumption efficiency increased from 14 to 48%. In experiments with 70 and 100 mg/L of NO2--N, nitrite consumption efficiencies were 74 and 58% respectively. The higher nitrite concentrations tested inhibited the anammox process since the specific rates diminished at (151 and 0.44 mg NO2--N/g VSS d respectively. This study provides new and useful information about the anammox activity in sludges coming from wetlands, and these can be used as potential inoculum to treat wastewaters into anammox reactors, or in constructed wetlands.
- 出版日期2017-8
