Phosphorus Co-Precipitation in the Biological Treatment of Slaughterhouse Wastewater in a Sequencing Batch Reactor
Publication: Practice Periodical of Hazardous, Toxic, and Radioactive Waste Management
Volume 9, Issue 3
Abstract
The effect of phosphorus co-precipitation with ferric chloride dosing on biological phosphorus (P) along with carbon (C) and nitrogen (N) removal was investigated in a sequencing batch reactor (SBR) for slaughterhouse wastewater treatment. Additional phosphorus removal due to chemical co-precipitation was evaluated as the difference in System P removal between Phase 1 (control—without dosing) and Phase 3 (with dosing). Phase 2 was mainly studied to improve nitrification/denitrification process with acetate addition by Filali-Meknassi et al. in 2004. Both systems (Phases 1 and 3) exhibited high P removal but a co-precipitation with dosing only allowed us to have an orthophosphates concentration below in the effluent. Without addition, the total P concentration was reduced from to (84% removal), whereas with the addition of an additional was removed bringing the effluent P concentration to (as total P). Although, during simulation of aerobic phase, a release of phosphorus was observed. The study showed that the ASM2d model with the adjustment (calibration) of seven kinetic parameters ( , , , , , , , and ) was capable of predicting the behavior of the laboratory SBR activated sludge and provided the profile of nutrients (phosphorus, , , and COD) removal.
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Acknowledgments
The writers are sincerely thankful to Natural Sciences and Engineering Research Council of Canada (Grant No. NRCA4984) for financial support. Thanks are also due to Y. Song for reviewing the manuscript.
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© 2005 ASCE.
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Received: Nov 23, 2004
Accepted: Nov 23, 2004
Published online: Jul 1, 2005
Published in print: Jul 2005
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