Back to Search
Start Over
A new approach to removing and recovering phosphorus from livestock wastewater using dolomite
- Source :
- Chemosphere. 255:127005
- Publication Year :
- 2020
- Publisher :
- Elsevier BV, 2020.
-
Abstract
- Recovering phosphorus from livestock wastewater could partly mitigate the global phosphorus resource crisis. Crystallization is a promising method for removing phosphorus from wastewater, but the costs of calcium- and magnesium-containing reagents are increasing. Cheap, available, efficient materials are required to replace conventional calcium and magnesium reagents. Here, we describe a new approach to removing and recovering phosphorus from livestock wastewater of a large pig farm, containing a high phosphorus concentration. The effects of the pH, stirring speed, stirring time, and extract dose (containing calcium and magnesium) on phosphorus removal from livestock wastewater were investigated. The product was characterized by X-ray diffractometry, Fourier-transform infrared spectroscopy, and scanning electron microscopy. Under optimized conditions (pH 9.0, stirring speed 200 r/m, stirring time 600 s, Ca 207.62 mg/L, Mg 122.86 mg/L), 92% of the phosphorus was removed from livestock wastewater. The product was mainly the hydroxyapatite (Ca5(PO4)3OH) precursor amorphous calcium phosphate but also contained 1.65% (by mass) magnesium ammonium phosphate (MgNH4PO4·6H2O) crystals. The cost of dolomite to treat 1 m3 of high-phosphorus wastewater was 0.20 yuan (45.9%, 25.9%, and 75.9% lower than for pure MgCl2, MgSO4, and CaCl2, respectively) in 2019. Using dolomite to provide calcium and magnesium effectively decreases the crystallization process cost and should encourage the use of crystallization to remove phosphorus from wastewater.
- Subjects :
- Calcium Phosphates
Farms
Livestock
Environmental Engineering
Struvite
Swine
Health, Toxicology and Mutagenesis
0208 environmental biotechnology
Dolomite
chemistry.chemical_element
02 engineering and technology
Wastewater
010501 environmental sciences
Calcium
01 natural sciences
Calcium Carbonate
Water Purification
law.invention
law
Animals
Environmental Chemistry
Magnesium
Amorphous calcium phosphate
Crystallization
0105 earth and related environmental sciences
Phosphorus
Public Health, Environmental and Occupational Health
General Medicine
General Chemistry
Pulp and paper industry
Pollution
020801 environmental engineering
chemistry
Reagent
Water Pollutants, Chemical
Subjects
Details
- ISSN :
- 00456535
- Volume :
- 255
- Database :
- OpenAIRE
- Journal :
- Chemosphere
- Accession number :
- edsair.doi.dedup.....9995cfada6b9cc73d85e9c302f77473c