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Effects of phosphorus recovery requirements on Swedish sludge management
KTH, School of Architecture and the Built Environment (ABE), Land and Water Resources Engineering (moved 20130630), Water, Sewage and Waste technology.ORCID iD: 0000-0002-6786-0342
KTH, Superseded Departments, Land and Water Resources Engineering.
KTH, Superseded Departments, Land and Water Resources Engineering.
KTH, Superseded Departments, Land and Water Resources Engineering.
2002 (English)In: Water Science and Technology, ISSN 0273-1223, 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).

Place, publisher, year, edition, pages
2002. Vol. 46, no 4-5, 435-440 p.
Keyword [en]
Phosphorus recovery, Sludge handling, Sweden
National Category
Water Engineering
Identifiers
URN: urn:nbn:se:kth:diva-5886ISI: 000178434900058OAI: oai:DiVA.org:kth-5886DiVA: diva2:10414
Note
QC 20100910Available from: 2005-09-02 Created: 2005-09-02 Last updated: 2012-02-10Bibliographically 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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