The aim of this study was to investigate the ability of the oxic-settling-anaerobic (OSA)-process and the folic acid addition applied in the activated sludge process to reduce the excess sludge production. The study was monitored during two distinct periods: activated sludge system with OSA-process, and activated sludge system with folic acid addition. The observed sludge yields (Yobs) were 0.30 and 0.08 kgTSS kg–1 chemical oxygen demand (COD), control phase and OSA-process (period 1); 0.33 and 0.18 kgTSS kg–1 COD, control phase and folic acid addition (period 2). The Yobs decreased by 73 and 45% in phases with the OSA-process and folic acid addition, respectively, compared with the control phases. The sludge minimization alternatives result in a decrease in excess sludge production, without negatively affecting the performance of the effluent treatment.
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Research Article|
October 26 2015
Valuation of OSA process and folic acid addition as excess sludge minimization alternatives applied in the activated sludge process
C. L. Martins;
1Department of Sanitary and Environmental Engineering – UFSC/CTC/ENS, Campus Universitário – Trindade, Florianópolis, SC 88.010-970, Brazil
E-mail: lavina8@hotmail.com
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V. F. Velho;
V. F. Velho
1Department of Sanitary and Environmental Engineering – UFSC/CTC/ENS, Campus Universitário – Trindade, Florianópolis, SC 88.010-970, Brazil
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S. R. A. Ramos;
S. R. A. Ramos
1Department of Sanitary and Environmental Engineering – UFSC/CTC/ENS, Campus Universitário – Trindade, Florianópolis, SC 88.010-970, Brazil
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A. S. C. D. Pires;
A. S. C. D. Pires
2Superior Institute of Agronomy, Lisboa, Portugal
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E. C. N. F. A. Duarte;
E. C. N. F. A. Duarte
2Superior Institute of Agronomy, Lisboa, Portugal
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R. H. R. Costa
R. H. R. Costa
1Department of Sanitary and Environmental Engineering – UFSC/CTC/ENS, Campus Universitário – Trindade, Florianópolis, SC 88.010-970, Brazil
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Water Sci Technol (2016) 73 (4): 734–739.
Article history
Received:
June 24 2015
Accepted:
September 30 2015
Citation
C. L. Martins, V. F. Velho, S. R. A. Ramos, A. S. C. D. Pires, E. C. N. F. A. Duarte, R. H. R. Costa; Valuation of OSA process and folic acid addition as excess sludge minimization alternatives applied in the activated sludge process. Water Sci Technol 22 February 2016; 73 (4): 734–739. doi: https://doi.org/10.2166/wst.2015.517
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