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The availability of phosphorus in municipal wastewater sludge as a function of the phosphorus removal process and sludge treatment method
The objective of this study was to determine the availability of phosphorus contained in different wastewater sludges and sludge‐soil mixtures. The sludges studied included raw and aerobically digested sludges from activated sludge treatment plants using four different methods of phosphorus removal: alum addition, ferric chloride addition, anaerobic/oxic biological phosphorus removal, and no provision for excess phosphorus removal. Test methods used to determine phosphorus availability of the sludges included the equilibrium phosphorus concentration test and soil‐incubation tests. The soil‐incubation studies consisted of soil and soil‐sand mixtures spiked with sludges. Testing on the pots compared initial pots to final pots after leaching with distilled water. Results showed that based on most measures, phosphorus was the most available from fertilizer. Phosphorus was also highly available from sludges generated without using chemical addition for phosphorus removal. Phosphorus availability of digested sludges versus raw sludges varied, depending on the method of analysis.
The availability of phosphorus in municipal wastewater sludge as a function of the phosphorus removal process and sludge treatment method
The objective of this study was to determine the availability of phosphorus contained in different wastewater sludges and sludge‐soil mixtures. The sludges studied included raw and aerobically digested sludges from activated sludge treatment plants using four different methods of phosphorus removal: alum addition, ferric chloride addition, anaerobic/oxic biological phosphorus removal, and no provision for excess phosphorus removal. Test methods used to determine phosphorus availability of the sludges included the equilibrium phosphorus concentration test and soil‐incubation tests. The soil‐incubation studies consisted of soil and soil‐sand mixtures spiked with sludges. Testing on the pots compared initial pots to final pots after leaching with distilled water. Results showed that based on most measures, phosphorus was the most available from fertilizer. Phosphorus was also highly available from sludges generated without using chemical addition for phosphorus removal. Phosphorus availability of digested sludges versus raw sludges varied, depending on the method of analysis.
The availability of phosphorus in municipal wastewater sludge as a function of the phosphorus removal process and sludge treatment method
Kyle, Michael A. (author) / McClintock, Samuel A. (author)
Water Environment Research ; 67 ; 282-289
1995-05-01
8 pages
Article (Journal)
Electronic Resource
English
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