Comparison of phosphorus removal characteristics between various biological nutrient removal processes
1997; Pergamon Press; Volume: 36; Issue: 12 Linguagem: Inglês
10.1016/s0273-1223(97)00729-4
ISSN1996-9732
AutoresSang-Eun Lee, Kwang Soo Kim, Jae Hwan Ahn, Chang Whoe Kim,
Tópico(s)Soil and Water Nutrient Dynamics
ResumoBench scale experiments were carried out with four biological nutrient removal(BNR) units, A/O, A 2 /O, Phostrip and P/L units, to investigate the behavior of phosphorus in the system and to compare the characteristics of phosphorus removal in four experimental BNR units. The influent COD/T-P ratio was varied from 22 to 64 by changing COD concentration while maintaining phosphorus concentration constant. In general sidestream BNR units such as Phostrip and P/L units outperformed mainstream BNR units such as A/O and A 2 /O units in terms of phosphorus removal. While phosphorus release and uptake in A/O and A 2 /O units became less significant at low influent COD/T-P, the phosphorus release in A 2 /O unit was further influenced by nitrate in return sludge and thus A 2 /O unit required even higher influent COD/T-P ratio for luxury uptake of phosphorus. The luxury uptake of phosphorus in Phostrip and P/L units were not affected by influent COD/T-P ratio and the adverse effect of nitrate in return sludge on anaerobic phosphorus release in P/L process was not significant due to the sludge blanket in P-stripper.
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