Simultaneous ammonium and p-hydroxybenzaldehyde oxidation in a sequencing batch reactor
The simultaneous ammonium and p-hydroxybenzaldehyde (pOHBD) oxidation capacity of a nitrifying sludge was investigated in a sequencing batch reactor (SBR). At all initial pOHBD concentrations tested (25-400 mg C/L), both ammonium (100 mg NH4-+N/L) and pOHBD were consumed with efficiencies of 99.2 ± 1.5% and 100 ±t 1%, respectively. At pOHBD concentrations lower than 100 mg C/L, the main product of ammonium oxidation was nitrate with a yield (Y NO3) of 0.97 ± 0.03 g NO-3-N/g NH+4-N consumed. At 200 and 400 mg pOHBD-C/L, Y NO3 decreased to 0.78 ± 0.05 and nitrite was detected (Y NO2 = 0.04 ± 0.01 g NO-2-N/g NH+4-N consumed). p-Hydroxybenzoate (pOHBT) was detected as product of pOHBD oxidation. pOHBT accumulation was significant in the first operation cycles at 25 mg pOHBD-C/L. Afterward, pOHBT was completely removed and no aromatic intermediates were detected. At low C/N ratio values (0.25-4), a dissimilatory nitrifying respiratory process was maintained (Y BM = 0.03 ± 0.01 g biomass-N/g NH+4-N consumed). These results show that nitrifying SBR can be successfully used for the simultaneous removal of animonium and p-hydroxybenzaldehyde in a unique reactor. This information might be useful for treating industrial wastewaters contaminated with nitrogen and recalcitrant phenolic compounds.
| Main Authors: | , , |
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| Format: | Digital revista |
| Language: | English |
| Published: |
Universidad Autónoma Metropolitana, División de Ciencias Básicas e Ingeniería
2013
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| Online Access: | http://www.scielo.org.mx/scielo.php?script=sci_arttext&pid=S1665-27382013000100010 |
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