Use of dewatered alum sludge as main substrate in treatment reed bed receiving agricultural wastewater: Long-term trial

Use of dewatered alum sludge as main substrate in treatment reed bed receiving agricultural... This study aims to explore a novel application of dewatered alum sludge cakes (DASC) as the main medium in a single model reed bed to treat phosphorus-rich animal farm wastewater under “tidal flow” operation on a long-term basis. It is expected that the cakes act as the carrier for developing biofilm and also serve as adsorbent to enhance phosphorus (P) immobilization. Results have demonstrated that average removal efficiencies of 73.3 ± 15.9% for COD, 82.9 ± 12.3% for BOD 5 , 86.4 ± 6.0% for RP (reactive P), 88.6 ± 7.2% for soluble reactive P (SRP) and 77.6 ± 17.5% for SS can be achieved during the two year’s operation. More significantly, the “P-adsorption proportion” by DASC in the reed bed is 42% of the overall P removal. The remaining removal of P may be contributed by the trapping and filtration process of DASC. Therefore, the lifetime of the DASC in reed bed is reasonably longer than that determined from the batch isotherm test. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Bioresource Technology Elsevier

Use of dewatered alum sludge as main substrate in treatment reed bed receiving agricultural wastewater: Long-term trial

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Publisher
Elsevier
Copyright
Copyright © 2008 Elsevier Ltd
ISSN
0960-8524
D.O.I.
10.1016/j.biortech.2008.07.040
Publisher site
See Article on Publisher Site

Abstract

This study aims to explore a novel application of dewatered alum sludge cakes (DASC) as the main medium in a single model reed bed to treat phosphorus-rich animal farm wastewater under “tidal flow” operation on a long-term basis. It is expected that the cakes act as the carrier for developing biofilm and also serve as adsorbent to enhance phosphorus (P) immobilization. Results have demonstrated that average removal efficiencies of 73.3 ± 15.9% for COD, 82.9 ± 12.3% for BOD 5 , 86.4 ± 6.0% for RP (reactive P), 88.6 ± 7.2% for soluble reactive P (SRP) and 77.6 ± 17.5% for SS can be achieved during the two year’s operation. More significantly, the “P-adsorption proportion” by DASC in the reed bed is 42% of the overall P removal. The remaining removal of P may be contributed by the trapping and filtration process of DASC. Therefore, the lifetime of the DASC in reed bed is reasonably longer than that determined from the batch isotherm test.

Journal

Bioresource TechnologyElsevier

Published: Jan 1, 2009

References

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