University of Oulu

Myllymäki, Pekka; Pesonen, Janne; Romar, Henrik; Hu, Tao; Tynjälä, Pekka; Lassi, Ulla (2019) The use of calcined paper mill sludge as a chemical precipitant in the simultaneous removal of ammonium and phosphate : paper mill waste recycling and reuse. In: Heraklion 2019, 7th International Conference on Sustainable Solid Waste Management Proceedings. http://uest.ntua.gr/heraklion2019/proceedings/pdf/HERAKLION2019_Myllymaki_etal.pdf

The use of calcined paper mill sludge as a chemical precipitant in the simultaneous removal of ammonium and phosphate : paper mill waste recycling and reuse

Saved in:
Author: Myllymäki, Pekka1; Pesonen, Janne1; Romar, Henrik1;
Organizations: 1Research Unit of Sustainable Chemistry,University of Oulu, P.O. Box 4300, FI-90014 Oulu, Finland
2Unit of Applied Chemistry, Kokkola University Consortium Chydenius, University of Jyväskylä, P.O. Box 567, FI-67101, Kokkola
Format: article
Version: published version
Access: open
Online Access: PDF Full Text (PDF, 0.6 MB)
Persistent link: http://urn.fi/urn:nbn:fi-fe2019112544121
Language: English
Published: National Technical University of Athens, 2019
Publish Date: 2019-11-25
Description:

Abstract

The European Union’s (EU) circular economy strategy aims to increase recycling and re-use of products and waste materials. According to strategy, the use of industry waste material and side flows should be more effective. In this research, a chemical precipitation method to simultaneously remove phosphate and nitrogen using calcined paper mill sludge was tested. Paper mill sludge is a waste material formed in the paper-making process. It mainly contains calcium carbonate and cellulose fibers. Objective of this research was to test whether the industrial waste could be used as low cost precipitation chemical for ammonium and phosphate removal from wastewaters or the precipitate could be suitable for fertilizer use. The study results indicated that calcined paper mill sludge removed as much ammonium nitrogen and phosphate as commercial CaO. Furthermore, the results showed that calcined paper mill sludge removed efficiently phosphate from the liquid phase of anaerobic digestate, which leads to formation of hydroxyapatite, Ca₅(PO₄)₃(OH). In this study we have shown, that calcined paper mill sludge can be used to manufacture recycled, slow-release fertilizers. Other possible mechanisms for the removal of phosphate and ammonium were also considered.

see all

Pages: 1 - 12
Host publication: Heraklion 2019, 7th International Conference on Sustainable Solid Waste Management Proceedings
Conference: 7th International Conference on Sustainable Solid Waste Management
Type of Publication: D3 Professional conference proceedings
Field of Science: 116 Chemical sciences
Subjects:
Copyright information: © 2019 The Authors and National Technical University of Athens. Available open access at : http://uest.ntua.gr/heraklion2019/proceedings/pdf/HERAKLION2019_Myllymaki_etal.pdf.