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Plant-availability of phosphorus in filter substrates derived from small-scale wastewater treatment systems [An article from: Ecological Engineering]
Book Details
PublisherElsevier
ISBN / ASINB000RR0QEG
ISBN-13978B000RR0QE2
AvailabilityAvailable for download now
MarketplaceUnited States 🇺🇸
Description
This digital document is a journal article from Ecological Engineering, published by Elsevier in 2004. 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:
Laboratory and greenhouse experiments were conducted on four filter substrates sampled from two constructed subsurface-flow wetlands (WL and WS) and from two infiltration basins (IB1 and IB2), to evaluate the solubility, mobility, and plant-availability of phosphorus (P) accumulated on the substrates during wastewater treatment. The solubility (P concentration in solution) and mobility (net and gross transfer of P ions between solution and substrates in suspension) were determined. The plant-availability of substrate P was assessed in pot experiments after the soil P was labeled with ^3^3P ions. The P accumulated on the substrates ranged from 138 to 276mgPkg^-^1 mainly under inorganic form. The P solubility increased up to 500 times and the P sorption capacity decreased significantly after the substrates were used in wastewater treatment. The mobile P varied with time and P concentration in the solution and was closely and highly fitted to the kinetic Freundlich equation. All inorganic P accumulated on substrates was mobile for the WS and WL and about 40% for IB1 and IB2. The P availability to plants did not vary significantly among substrates and with a water-soluble mineral P compound (KH"2PO"4). It is concluded that the P accumulated on the four substrates was an effective P source for the plants.
Description:
Laboratory and greenhouse experiments were conducted on four filter substrates sampled from two constructed subsurface-flow wetlands (WL and WS) and from two infiltration basins (IB1 and IB2), to evaluate the solubility, mobility, and plant-availability of phosphorus (P) accumulated on the substrates during wastewater treatment. The solubility (P concentration in solution) and mobility (net and gross transfer of P ions between solution and substrates in suspension) were determined. The plant-availability of substrate P was assessed in pot experiments after the soil P was labeled with ^3^3P ions. The P accumulated on the substrates ranged from 138 to 276mgPkg^-^1 mainly under inorganic form. The P solubility increased up to 500 times and the P sorption capacity decreased significantly after the substrates were used in wastewater treatment. The mobile P varied with time and P concentration in the solution and was closely and highly fitted to the kinetic Freundlich equation. All inorganic P accumulated on substrates was mobile for the WS and WL and about 40% for IB1 and IB2. The P availability to plants did not vary significantly among substrates and with a water-soluble mineral P compound (KH"2PO"4). It is concluded that the P accumulated on the four substrates was an effective P source for the plants.
