Biological nitrogen removal associated with the physical and chemical phosphorus removal in a reactor activated sludge aeration operated under low
DOI:
https://doi.org/10.6008/SPC2179-6858.2017.002.0009Keywords:
Activated Sludge, Simultaneous Nitrification and Denitrification, Removal of Phosphorus, Low AerationAbstract
In the present study we evaluated the behavior of a sludge pilot unit activated for the treatment of sewage in the extended aeration configuration streaming, operated with low concentration of dissolved oxygen in the aeration tank in order to achieve nitrification and simultaneous denitrification (NDS). In addition to phosphorus removal in the system by means of coagulant dosage (ferric chloride) directly into the aeration tank was evaluated. The results show that the addition of ferric chloride improves the quality of the final effluent in terms of COD due to improved biological flocculation and as a result better sludge settleability which may be attractive for processes with NDS. For nitrogen removal results show that it is possible to obtain with the process of NDS an effluent with low concentration of ammonia, which was 7.0 mgN-NH3-/L and Nitrate 4.0 mgN-NO3-/ L. For phosphorus dosage of 170 mgFeCl3/L, although higher resulted in an effluent with concentrations less than 1.5 mgP/L, although still high concentration dosages can be adjusted to obtain concentrations that meet the Recommended limits.
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