Valuation of OSA process and folic acid addition as excess sludge minimization alternatives applied in the activated sludge process

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,...

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Bibliographic Details
Published in:Water science and technology 2016-02, Vol.73 (4), p.734-739
Main Authors: Martins, C L, Velho, V F, Ramos, S R A, Pires, A S C D, Duarte, E C N F A, Costa, R H R
Format: Article
Language:English
Subjects:
Acids
Activated sludge
Activated sludge process
Alternatives
Anaerobic processes
Anaerobiosis
Bacteria - metabolism
Biodegradation, Environmental
Chemical oxygen demand
Control
Effluent treatment
Folic acid
Folic Acid - analysis
Folic Acid - metabolism
Metabolism
Optimization
Oxygen demand
Phases
Retention
Sewage - chemistry
Sewage - microbiology
Sludge
Studies
Vitamin B
Waste Water - chemistry
Waste Water - microbiology
Wastewater treatment
Water Purification - methods
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Summary: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.
ISSN:0273-1223
1996-9732
DOI:10.2166/wst.2015.517