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Phosphorus recovery by one- or two-step technology with use of acids and bases
KTH, Superseded Departments, Land and Water Resources Engineering.
KTH, Superseded Departments, Land and Water Resources Engineering.
2003 (English)In: WASTEWATER SLUDGE AS A RESOURCE / [ed] Odegaard, H., 2003Conference paper, Published paper (Refereed)
Abstract [en]

The method of using sludge fractionation is considered to be a sustainable solution where the sludge is seen as the raw material from which products are recovered. This paper will present solutions of advanced technology system for a large wastewater treatment plant. Use of enhanced biological phosphorus removal and fractionation of the sludge in two stages is advantageous both with respect to low necessary chemical and energy demands and recovery efficiency. Phosphorous recovery may be based on one- or two-step technology.

Experimental studies have shown that it is possible to recover phosphorus from sludge by the combination of supercritical water oxidation process and alkaline leaching. When the concentration of sodium hydroxide is around 1 M, approximate 50 % of total phosphorus is recovered in room temperature. Meanwhile, over 98 % of the soluble phosphorus is recovered from the liquid phase by adding calcium chloride (CaCl2).

Place, publisher, year, edition, pages
2003.
Keyword [en]
phosphorus recovery, sludge, supercritical water oxidation
National Category
Water Engineering
Identifiers
URN: urn:nbn:se:kth:diva-5891ISI: 000185659600035ISBN: 82-7598-056-9 (print)OAI: oai:DiVA.org:kth-5891DiVA: diva2:10419
Conference
International Conference on Wastewater Sludge as a Resource (BIOSOLIDS 2003) TRONDHEIM, NORWAY, JUN 23-25, 2003
Note
QC 20100930Available from: 2005-09-02 Created: 2005-09-02 Last updated: 2010-09-30Bibliographically 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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