effects of magnesium and ammonium additions on phosphate recovery from greenhouse wastewater

Phosphorus recovery from greenhouse wastewater, using precipitation-crystallization, was conducted under three levels of calcium concentration, 304 mg/L (7.6 mmol/L), 384 mg/L (9.6 mmol/L), and 480 mg/L (12 mmol/L), and also with additions of ammonium and magnesium into the wastewater. Jar test resu...

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Bibliographic Details
Published in:Journal of environmental science and health. Part B, Pesticides, food contaminants, and agricultural wastes Pesticides, food contaminants, and agricultural wastes, 2005-01, Vol.40 (2), p.363-374
Main Authors: Yi, W, Lo, K.V, Mavinic, D.S, Liao, P.H, Koch, F
Format: Article
Language:English
Subjects:
Ammonia
ammonium compounds
calcium
chemical concentration
Chemical Precipitation
chemical reactions
Crystallization
drainage water
Durapatite - chemistry
Greenhouse wastewater
greenhouses
hydroxyapatite
Magnesium
Magnesium Compounds - chemistry
phosphates
Phosphates - chemistry
Phosphates - isolation & purification
Phosphorus
Precipitation
Sewage - chemistry
Struvite
wastewater
wastewater treatment
Water Pollutants, Chemical - isolation & purification
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Summary:Phosphorus recovery from greenhouse wastewater, using precipitation-crystallization, was conducted under three levels of calcium concentration, 304 mg/L (7.6 mmol/L), 384 mg/L (9.6 mmol/L), and 480 mg/L (12 mmol/L), and also with additions of ammonium and magnesium into the wastewater. Jar test results confirmed high phosphate removal, with more than 90% of the removal achieved with a pH as low as 7.7. Under the low calcium concentration, ammonium addition affected the chemical reactions at pH lower than 8.0, where struvite was produced; when the pH was raised to 8.8, other calcium compounds dominated the precipitation. Under the medium calcium concentration, ammonium and magnesium addition helped struvite precipitation in the low pH range. Hydroxyapatite (HAP) was the main product. Under the high calcium concentration, ammonium addition showed no effects on the precipitation.
ISSN:0360-1234
1532-4109
DOI:10.1081/PFC-200045569