Recovery of phosphorous from industrial waste water by oxidation and precipitation
Journal article, 2018

This paper describes the development of a method for recovery of phosphorous from one of the waste waters at an Akzo Nobel chemical plant in Ale close to Göteborg. It was found that it is possible to transform the phosphorous in the waste water to a saleable product, i.e. a slowly dissolving fertilizer. The developed process includes oxidation of phosphite to phosphate with hydrogen peroxide and heat. The phosphate is then precipitated as crystalline struvite (ammonium magnesium phosphate) by the addition of magnesium chloride. The environmental impacts of the new method were compared with those of the current method using life cycle assessment. It was found that the methodology developed in this project was an improvement compared with the current practice regarding element resource depletion and eutrophication. However, the effect on global warming would be greater with the new method. There could however be several ways to decrease the global warming effect. Since most of the carbon dioxide emissions come from the production of magnesium chloride from carbonates, changing to utilization of a magnesium chloride from desalination of seawater or from recycling of PVC would decrease the carbon footprint significantly.

precipitation

oxidation

life cycle assessment

Phosphorous recovery

industrial waste water

Author

Rikard E Ylmén

Chalmers, Chemistry and Chemical Engineering, Energy and Material, Nuclear Chemistry

Anna Gustafsson

Chalmers, Chemistry and Chemical Engineering, Energy and Material, Nuclear Chemistry

Caterina Camerani-Pinzani

Akzo Nobel - Pulp and Performance Chemicals

Britt-Marie Steenari

Chalmers, Chemistry and Chemical Engineering, Energy and Material, Nuclear Chemistry

Environmental Technology (United Kingdom)

0959-3330 (ISSN)

Vol. 39 15 1886-1897

Subject Categories

Other Environmental Engineering

Environmental Management

Environmental Sciences

DOI

10.1080/09593330.2017.1342698

More information

Latest update

7/2/2018 1