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Effect of basic operating parameters on biological phosphorus removal in a continuous-flow anaerobic–anoxic activated sludge system

Content Provider	Springer Nature Link
Author	Kapagiannidis, A. G. Zafiriadis, I. Aivasidis, A.
Copyright Year	2011
Abstract	A continuous-flow anaerobic–anoxic (A2) activated sludge system was operated for efficient enhanced biological phosphorus removal (EBPR). Because of the system configuration with no aeration zones, phosphorus (P) uptake takes place solely under anoxic conditions with simultaneous denitrification. Basic operating conditions, namely biomass concentration, influent carbon to phosphorus ratio and anaerobic retention time were chosen as variables in order to assess their impact on the system performance. The experimental results indicated that maintenance of biomass concentration above 2,500 mg MLVSS/L resulted in the complete phosphate removal from the influent (i.e. 15 mg PO4 3−-P/L) for a mean hydraulic residence time (HRT) of 15 h. Additionally, by increasing the influent COD/P ratio from 10 to 20 g/g, the system P removal efficiency was improved although the experimental results indicated a possible enhancement of the competition between phosphorus accumulating organisms (PAOs) and other microbial populations without phosphorus uptake ability. Moreover, because of the use of acetate (i.e. easily biodegradable substrate) as the sole carbon source in the system feed, application of anaerobic retention times greater than 2 h resulted in no significant release of additional P in the anaerobic zone and no further amelioration of the system P removal efficiency. The application of anoxic P removal resulted in more than 50% reduction of the organic carbon necessitated for nitrogen and phosphorus removal when compared to a conventional EBPR system incorporating aerobic phosphorus removal.
Starting Page	371
Ending Page	382
Page Count	12
File Format	PDF
ISSN	16157591
Journal	Bioprocess Engineering
Volume Number	35
Issue Number	3
e-ISSN	16157605
Language	English
Publisher	Springer-Verlag
Publisher Date	2011-07-28
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Anoxic P removal Continuous-flow A2 system COD/P ratio Anaerobic retention time Wastewater treatment Industrial Chemistry/Chemical Engineering Environmental Engineering/Biotechnology Industrial and Production Engineering Food Science Biotechnology
Content Type	Text
Resource Type	Article
Subject	Medicine Bioengineering Biotechnology

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