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Phosphorus release and recovery from treated sewage sludge
KTH, School of Architecture and the Built Environment (ABE), Land and Water Resources Engineering.
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 [en]
Ash; Phosphorus release; Phosphorus recovery; Sludge fractionation; Supercritical water oxidation; Sustainable sludge handling.
National Category
Water Engineering
Identifiers
URN: urn:nbn:se:kth:diva-402ISBN: 91-7178-123-4 (print)OAI: oai:DiVA.org:kth-402DiVA: diva2:10421
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
List of papers
1. Development of phosphorus recovery technologies in European countries
Open this publication in new window or tab >>Development of phosphorus recovery technologies in European countries
(English)In: Journal of resourcesArticle in journal (Refereed) Submitted
National Category
Water Engineering
Identifiers
urn:nbn:se:kth:diva-5885 (URN)
Note

QC 20100930

Available from: 2005-09-02 Created: 2005-09-02 Last updated: 2014-09-22Bibliographically approved
2. Effects of phosphorus recovery requirements on Swedish sludge management
Open this publication in new window or tab >>Effects of phosphorus recovery requirements on Swedish sludge management
2002 (English)In: Water Science and Technology, ISSN 0273-1223, E-ISSN 1996-9732, Vol. 46, no 4-5, 435-440 p.Article in journal (Refereed) Published
Abstract [en]

Expected requirements of phosphorus recovery, restrictions on sludge disposal on landfill, and difficulties in obtaining consensus on sludge use on agricultural land has led to several development works in Sweden to change sludge management methods. Especially sludge fractionation has gained interest including following steps to recover products and separate transfer of toxic substances into a small stream. Commercial systems are offered based on technology by Cambi/KREPRO and BioCon and other companies and many other methods are under development. Iron salts are widely used in Sweden as precipitation agents for phosphorus removal and this technology has some disadvantages for phosphorus recovery compared with the use of biological phosphorus removal. The amount of chemicals needed for a KREPRO or a BioCon system was calculated for a treatment plant which has an addition of iron salt resulting in 1,900 mole Fe per tonne DS. The result was compared with the chemical consumption of recovery systems installed at plants with lower use of iron for precipitation. The chemical consumption in equivalents per tonne DS was found to be 5,000 + 6,000 * (molar ratio iron to phosphorus).

Keyword
Phosphorus recovery, Sludge handling, Sweden
National Category
Water Engineering
Identifiers
urn:nbn:se:kth:diva-5886 (URN)000178434900058 ()
Note
QC 20100910Available from: 2005-09-02 Created: 2005-09-02 Last updated: 2017-12-14Bibliographically approved
3. Phosphorus recovery from sewage sludge by thermal treatment and use of acids and bases
Open this publication in new window or tab >>Phosphorus recovery from sewage sludge by thermal treatment and use of acids and bases
2002 (English)In: Chemical Water and Wastewater Treatment VII / [ed] Hahn, H.H., Hoffmann, E., Ödegaard, H., London: IWA-publishing , 2002, 331-338 p.Chapter in book (Other academic)
Place, publisher, year, edition, pages
London: IWA-publishing, 2002
National Category
Water Engineering
Identifiers
urn:nbn:se:kth:diva-5887 (URN)
Note
QC 20100930Available from: 2005-09-02 Created: 2005-09-02 Last updated: 2010-09-30Bibliographically approved
4. Chemical requirements for phosphorus release from sewage sludge treated with supercritical water oxidation
Open this publication in new window or tab >>Chemical requirements for phosphorus release from sewage sludge treated with supercritical water oxidation
2005 (English)In: Water Research, ISSN 0043-1354, E-ISSN 1879-2448Article in journal (Other academic) Submitted
National Category
Water Engineering
Identifiers
urn:nbn:se:kth:diva-5888 (URN)
Note
QS 20120316Available from: 2005-09-02 Created: 2005-09-02 Last updated: 2017-12-14Bibliographically approved
5. Phosphorus release from ash, dried sludge and sludge residue from supercritical water oxidation by acid or base
Open this publication in new window or tab >>Phosphorus release from ash, dried sludge and sludge residue from supercritical water oxidation by acid or base
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.

Keyword
biosolids, incinerated ash, phosphorus recovery, sewage sludge, sludge handling
National Category
Water Engineering
Identifiers
urn:nbn:se:kth:diva-5889 (URN)10.1016/j.chemosphere.2005.04.069 (DOI)000235436700019 ()2-s2.0-31144454129 (Scopus ID)
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
6. New system technology for combined phosphorus removal and recovery
Open this publication in new window or tab >>New system technology for combined phosphorus removal and recovery
2002 (English)Conference paper, Published paper (Refereed)
National Category
Water Engineering
Identifiers
urn:nbn:se:kth:diva-5890 (URN)
Conference
Proc. 3rd IWA World Water Congress, Melbourne, Australia 7-12 April 2002.
Note

QC 20100930

Available from: 2005-09-02 Created: 2005-09-02 Last updated: 2017-08-15Bibliographically approved
7. Phosphorus recovery by one- or two-step technology with use of acids and bases
Open this publication in new window or tab >>Phosphorus recovery by one- or two-step technology with use of acids and bases
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).

Keyword
phosphorus recovery, sludge, supercritical water oxidation
National Category
Water Engineering
Identifiers
urn:nbn:se:kth:diva-5891 (URN)000185659600035 ()82-7598-056-9 (ISBN)
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
8. Phosphorus recovery from sewage sludge treated with supercritical water oxidation or incineration
Open this publication in new window or tab >>Phosphorus recovery from sewage sludge treated with supercritical water oxidation or incineration
2005 (English)In: Chemosphere, ISSN 0045-6535, E-ISSN 1879-1298Article in journal (Other academic) Submitted
National Category
Water Engineering
Identifiers
urn:nbn:se:kth:diva-5892 (URN)
Note

QS 20120316

Available from: 2005-09-02 Created: 2005-09-02 Last updated: 2017-12-14Bibliographically approved

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