G5 Doctoral dissertation (article)
Development of a method for phosphorus recovery from wastewaters (2022)
Menetelmän kehittäminen fosforin talteenottamiseksi jätevesistä

Reuna, S. (2022). Development of a method for phosphorus recovery from wastewaters [Doctoral dissertation]. University of Jyväskylä. JYU Dissertations, 486. http://urn.fi/URN:ISBN:978-951-39-8997-2

JYU authors or editors

Publication details

All authors or editors: Reuna, Sini

eISBN: 978-951-39-8997-2

Journal or series: JYU Dissertations

eISSN: 2489-9003

Publication year: 2022

Number in series: 486

Number of pages in the book: 1 verkkoaineisto (67 sivua, 12 sivua useina numerointijaksoina, 12 numeroimatonta sivua)

Publisher: University of Jyväskylä

Place of Publication: Jyväskylä

Publication country: Finland

Publication language: English

Persistent website address: http://urn.fi/URN:ISBN:978-951-39-8997-2

Publication open access: Openly available

Publication channel open access: Open Access channel

Abstract

As an irreplaceable element for all life on Earth, the supply of phosphorus (P) needs to be preserved. Since the natural inorganic resources are slowly depleting, one gazes upon secondary sources for P such as sewage sludge. By developing recovery processes for phosphorus from secondary sources we can respond to the ever-increasing consumption of phosphate fertilizers and ensure that future generations will have a secure food supply. In this thesis, a method for P recovery from post-precipitated sewage sludge is presented. The research has been part of the development of Helsinki Region Environmental Services’ RAVITA -process. The literature review describes the already existing technologies for P recovery and the general principles of the techniques used in the method development such as the design of experiments (DOE) and solvent extraction. The experimental section briefly defines the experimental procedures used in the original publications. In the results section first, the results from elemental analysis of the post-precipitated sludge are shown. The main components in the sludge are phosphorus and the metal used in precipitation in the production of the sludge. Trace metal concentrations in the post-precipitated sludge are below the average trace metal content of the sewage sludge in the EU. Then the findings from the optimization of the leaching procedure for post-precipitated sewage sludge are presented. Phosphoric acid was selected as leaching acid and the optimization was systematically implemented with the design of experiments procedure. Last the purification procedure for the obtained phosphoric acid solution was investigated. The precipitation metal is recovered from the phosphoric acid solution with solvent extraction.

Keywords: waste water treatment; sewage; utilisation; precipitation (active); sewage sludge; phosphorus; recovery (recapture); experimental methods; doctoral dissertations

Free keywords: phosphorus; municipal sewage sludge; solvent extraction; recovery; wastewater

Contributing organizations

Ministry reporting: Yes

Reporting Year: 2022