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Phosphorus retention processes in shell sand filter systems treating municipal wastewater [An article from: Ecological Engineering]
Book Details
Author(s)A.K. Sovik, B. Klove
PublisherElsevier
ISBN / ASINB000RR5ZI8
ISBN-13978B000RR5ZI7
AvailabilityAvailable for download now
MarketplaceUnited States 🇺🇸
Description
This digital document is a journal article from Ecological Engineering, published by Elsevier in . The article is delivered in HTML format and is available in your Amazon.com Media Library immediately after purchase. You can view it with any web browser.
Description:
The suitability of shell sand as a P sorbent has been tested both with laboratory batch experiments as well as in a sub-surface flow (SSF) meso-scale constructed sand filter treating municipal wastewater from a single household. The batch experiments suggest that retention of P in shell sand occurs both as sorption and precipitation. The soil-water ratio was found to be a crucial parameter when performing laboratory batch experiments. The maximum retention capacity was about 8000 and 800mgPkg^-^1 sand, and the K"d was 33.7 and 82.9Lkg^-^1 for soil-water ratios of 5g-75mL and 50g-50mL, respectively. The average total accumulated P concentration in samples from the SSF sand filter was 335mgPkg^-^1. The K"d value based on [PO"4^3^-] and accumulated concentration of inorganic P in the SSF filter was 89.8Lkg^-^1. Thus the batch experiments overestimated the retention capacity of shell sand in real sand filter systems, however, a ratio of 50-50 gave a more reasonable estimate than a ratio of 5-75. The K"d value from batch samples with a ratio of 50-50 also gave a good estimate of the K"d value in the constructed sand filter. Ca-P was found to be the predominant form of P mineral in samples collected from the SSF sand filter. Some Al-P, loosely bounded P, and occluded P were also present in the sand.
Description:
The suitability of shell sand as a P sorbent has been tested both with laboratory batch experiments as well as in a sub-surface flow (SSF) meso-scale constructed sand filter treating municipal wastewater from a single household. The batch experiments suggest that retention of P in shell sand occurs both as sorption and precipitation. The soil-water ratio was found to be a crucial parameter when performing laboratory batch experiments. The maximum retention capacity was about 8000 and 800mgPkg^-^1 sand, and the K"d was 33.7 and 82.9Lkg^-^1 for soil-water ratios of 5g-75mL and 50g-50mL, respectively. The average total accumulated P concentration in samples from the SSF sand filter was 335mgPkg^-^1. The K"d value based on [PO"4^3^-] and accumulated concentration of inorganic P in the SSF filter was 89.8Lkg^-^1. Thus the batch experiments overestimated the retention capacity of shell sand in real sand filter systems, however, a ratio of 50-50 gave a more reasonable estimate than a ratio of 5-75. The K"d value from batch samples with a ratio of 50-50 also gave a good estimate of the K"d value in the constructed sand filter. Ca-P was found to be the predominant form of P mineral in samples collected from the SSF sand filter. Some Al-P, loosely bounded P, and occluded P were also present in the sand.
