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Phosphorus release from ash, dried sludge and sludge residue from supercritical water oxidation by acid or base
KTH, School of Architecture and the Built Environment (ABE), Land and Water Resources Engineering.
KTH, School of Architecture and the Built Environment (ABE), Land and Water Resources Engineering.
KTH, School of Architecture and the Built Environment (ABE), Land and Water Resources Engineering.
2006 (English)In: Chemosphere, ISSN 0045-6535, E-ISSN 1879-1298, Vol. 62, no 5, 827-832 p.Article in journal (Refereed) Published
Abstract [en]

Leaching of ash and dried sewage sludge were investigated and compared with the leaching results of sludge residue from supercritical water oxidation (SCWO). This article focuses on how the composition of ash and sludge residues influences the extraction of phosphate and heavy metals and if different treatment temperatures of the sludge effect the leachability. Results showed that acid leaching gave a higher release of phosphate than alkaline leaching for all ash and sludge residue samples. Also, alkaline leaching dissolved phosphate with a lower metal contamination than acid leaching. Furthermore, it was found that iron had a low release at both alkaline and acid leaching from ash and from SCWO residue.

The difference in composition of ash and sludge residue samples had no significant influence on release of phosphate at high concentrations of acid. Phosphate release from ash, dried sludge at 300 degrees C and SCWO residue showed similar results at I M acid leaching. However, it seems to be easier to release phosphate from the SCWO residue than from the ash at low acid concentrations. SCWO residue showed higher release than the other ashes at 0.5 M HCl. Results for alkaline leaching showed higher release from ash at I M NaOH than from SCWO residue or from dried sludge at 300 degrees C. The leaching of phosphate from dried sludge seems to be temperature dependent, as the dried sludge treated at higher temperature showed less release of phosphate. It was found that the pre-treatment of the ash may be important for better release of phosphate.

Place, publisher, year, edition, pages
2006. Vol. 62, no 5, 827-832 p.
Keyword [en]
biosolids, incinerated ash, phosphorus recovery, sewage sludge, sludge handling
National Category
Water Engineering
Identifiers
URN: urn:nbn:se:kth:diva-5889DOI: 10.1016/j.chemosphere.2005.04.069ISI: 000235436700019Scopus ID: 2-s2.0-31144454129OAI: oai:DiVA.org:kth-5889DiVA: diva2:10417
Note
QC 20100927. Uppdaterad från In press till Published (20100927).Available from: 2005-09-02 Created: 2005-09-02 Last updated: 2017-12-14Bibliographically approved
In thesis
1. Phosphorus release and recovery from treated sewage sludge
Open this publication in new window or tab >>Phosphorus release and recovery from treated sewage sludge
2005 (English)Doctoral thesis, comprehensive summary (Other scientific)
Abstract [en]

In working towards a sustainable society, recycling and recovery of products together with handling of scarce resources must be considered. The growing quantities of sludge from wastewater treatment plants and the increasingly stringent restrictions on landfilling and on agricultural use of sludge are promoting other disposal alternatives. Sludge fractionation, providing sludge volume reduction, product recovery and separation of toxic substances into a small stream, has gained particular interest. In this thesis, the potential for phosphate release and recovery from treated sewage sludge is investigated as an alternative for agricultural use in urban areas. Leaching and recovery experiments were performed on sludge residue from supercritical water oxidation, ash from incineration and dried sludge at different temperatures.

Results showed that acid or alkaline leaching is a promising method to release phosphate from sewage sludge treated with supercritical water oxidation, incineration, or drying at 300°C. The leaching is affected by a number of factors, including how the sludge residue has been produced, the origin of the sludge residue, the quantity of chemicals added and the presence of ions in the leachate.

The implementation of any particular sludge treatment technology would depend on cost, environmental regulations, and social aspects. The results of this thesis may be beneficial for minimizing the use and cost of chemicals, and give increased knowledge for further development of technology for phosphate recovery.

Place, publisher, year, edition, pages
Stockholm: KTH, 2005. xvi, 31 p.
Series
Trita-LWR. PHD, ISSN 1650-8602 ; 1024
Keyword
Ash; Phosphorus release; Phosphorus recovery; Sludge fractionation; Supercritical water oxidation; Sustainable sludge handling.
National Category
Water Engineering
Identifiers
urn:nbn:se:kth:diva-402 (URN)91-7178-123-4 (ISBN)
Public defence
2005-09-14, Q2, Osquldas väg 10, 1 tr ned, Stockholm, 13:30
Opponent
Supervisors
Note
QC 20100930Available from: 2005-09-02 Created: 2005-09-02 Last updated: 2010-09-30Bibliographically approved

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