Calcium phosphate precipitation in nitrified wastewater from the potato-processing industry

Increasing environmental concerns and the awareness of the finite nature of natural resources make the valorization of waste materials to become a real challenge. The objective of the current research is to investigate the possibility of phosphate recovery as calcium phosphate salts from the wastewa...

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Bibliographic Details
Published in:Environmental technology 2019-07, Vol.40 (17), p.2250-2266
Main Authors: Monballiu, A., Ghyselbrecht, K., Crabeels, X., Meesschaert, B.
Format: Article
Language:English
Subjects:
Bicarbonates
Calcium
Calcium carbonate
Calcium ions
Calcium Phosphates
Carbonates
Chemical Precipitation
hydroxyapatite
Magnesium Compounds
Natural resources
Nitrification
Nutrient recovery
pH effects
phosphate removal
Phosphates
Potatoes
Processing industry
Salts
Solanum tuberosum
Struvite
Waste Disposal, Fluid
Waste materials
Waste Water
Wastewater
Wastewater treatment
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Summary:Increasing environmental concerns and the awareness of the finite nature of natural resources make the valorization of waste materials to become a real challenge. The objective of the current research is to investigate the possibility of phosphate recovery as calcium phosphate salts from the wastewater from the potato-processing industry. Batch tests demonstrated that at high pH, struvite and calcium carbonate precipitations are competitive processes and that bicarbonate inhibits the precipitation of calcium phosphate salts. A biological nitrification of the wastewater removed the buffering capacity, the competitive formation of struvite and paved the way for phosphate precipitation as calcium phosphate salts as it also led to the simultaneous removal of (bi)carbonates. It is demonstrated that 75% of the phosphate precipitated as calcium phosphate at a [Ca 2+ ]/[P] ratio of 2.5 at pH 8.5 and as such it provides a convenient alternative for the currently applied struvite processes in the agro-industrial industry.
ISSN:0959-3330
1479-487X
DOI:10.1080/09593330.2018.1439112