Recovery of phosphate as hydroxyapatite by fluidized bed homogeneous crystallization technique

Phosphorous recovery from aqueous solutions gained substantial attention and this not only secure the food demand but also curtail the pollution of freshwater courses. In the current study, authors employed novel fluidized bed homogeneous crystallization (FBHC) technique to granulate the phosphorous...

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Published in:Environmental science and pollution research international 2022-06, Vol.29 (30), p.46214-46225
Main Authors: Divya, Kandethupara Bhaskaran, Ramesh, Srikrishnaperumal Thanga, Lavanya, Addagada, Gandhimathi, Rajan
Format: Article
Language:English
Subjects:
Aquatic Pollution
Aqueous solutions
Atmospheric Protection/Air Quality Control/Air Pollution
Calcium
Crystallization
Crystals
Earth and Environmental Science
Ecotoxicology
Environment
Environmental Chemistry
Environmental Health
Environmental science
Fluidized beds
Freshwater pollution
Granulation
Hydroxyapatite
pH effects
Phosphorus removal
Process parameters
Reaction time
Recovery
Research Article
Response surface methodology
Waste Water Technology
Water Management
Water Pollution Control
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Summary:Phosphorous recovery from aqueous solutions gained substantial attention and this not only secure the food demand but also curtail the pollution of freshwater courses. In the current study, authors employed novel fluidized bed homogeneous crystallization (FBHC) technique to granulate the phosphorous as hydroxyapatite (HAP). FBHC technique nurtures the formation of high pure HAP crystals without seed addition and potential technique to recover phosphorous compared to other techniques. The key operational parameters influencing the HAP crystallization were analyzed prior to FBHC by batch analysis. From the batch study results, the range of pH and calcium to phosphorous molar ratio fixed for FBHC studies. Maximum phosphate removal and granulation efficiencies obtained were 91.25% and 82.55%, respectively, at 500 mg/L phosphate concentration, pH 12, and calcium to phosphorous molar ratio 1.65. Box-Behnken design of response surface methodology was employed for evaluating interaction impact of process parameters on granulation efficiency. Granulation efficiency of 79.74% was attained at pH 11.83, calcium to phosphorous molar ratio 1.637, and reaction time 70.73 h. Graphical abstract
ISSN:0944-1344
1614-7499
DOI:10.1007/s11356-022-19135-9