Phosphorus partitioning in co-dewatering biosolids and water treatment residuals
In: Water Science and Technology, Jg. 70 (2014-05-27), S. 422-429
Online
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Zugriff:
Stabilization and dewatering methods for wastewater solids determine the concentration and nature of phosphorus (P) in biosolids and in-plant sidestreams recycled to the liquid treatment facility. Because water treatment residuals (WTR) exhibit strong immobilization of soluble P, this study evaluated the impact of co-dewatering WTR and biosolids on the P partitioning during dewatering and the environmental lability of biosolids-P measured by water-extractable P (WEP). Overall, P progressively partitioned into the water-insoluble particulate-bound form in dewatered cake with increasing blending ratio (BR) – defined as the dry mass ratio of WTR to biosolids. The reject water total P (TP) content from dewatering biosolids alone (250 mg L−1) was reduced to 60 mg L−1 for a BR = 1.5. Polymer addition resulted in statistically (α = 0.05) lower reject liquid TP, suggesting the cationic polyelectrolyte contributed to P binding. The WEP of the dewatered cake (∼20% solids) dropped from 2.36 g kg−1 (biosolids only) to ∼0.14 g kg−1 for BR = 1.5, meaning the P in land-applied co-processed cake is less susceptible to solubilization by surface runoff compared to unamended biosolids. Co-dewatering can reduce P in return flows and fix P in the dewatered solids in a form less prone to off-site migration following land application.
Titel: |
Phosphorus partitioning in co-dewatering biosolids and water treatment residuals
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Autor/in / Beteiligte Person: | Elliott, Herschel A. ; Taylor, Malcolm |
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Zeitschrift: | Water Science and Technology, Jg. 70 (2014-05-27), S. 422-429 |
Veröffentlichung: | IWA Publishing, 2014 |
Medientyp: | unknown |
ISSN: | 1996-9732 (print) ; 0273-1223 (print) |
DOI: | 10.2166/wst.2014.241 |
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