Phosphorus recovery from sewage sludge - phosphorus leaching behavior from aluminum-containing tertiary and anaerobically digested sludge

Systematic investigations of the acidic dissolution of phosphorus (P), aluminum (Al), iron (Fe), and calcium (Ca) from Al-containing tertiary sludge were carried out in this work. The results were compared with the dissolution behavior of Al-containing anaerobically digested sludge to evaluate the P...

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Bibliographic Details
Published in:Water science and technology 2020-10, Vol.82 (8), p.1509-1522
Main Authors: Monea, Marlena Cristina, Meyer, Carsten, Steinmetz, Heidrun, Schönberger, Harald, Drenkova-Tuhtan, Asya
Format: Article
Language:English
Subjects:
Aluminium
Aluminum
Ammonium nitrogen
Calcium
Chloride
Contaminants
Dissolution
Dissolving
Efficiency
Heavy metals
Investigations
Iron
Leaching
Metals
pH effects
Phosphates
Phosphorus
Pollutants
Precipitation
Recovery
Sewage
Sewage sludge
Sludge
Sludge digestion
Struvite
Water treatment
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Summary:Systematic investigations of the acidic dissolution of phosphorus (P), aluminum (Al), iron (Fe), and calcium (Ca) from Al-containing tertiary sludge were carried out in this work. The results were compared with the dissolution behavior of Al-containing anaerobically digested sludge to evaluate the P recovery potential in the form of struvite from tertiary sludge versus anaerobically digested sludge. Additional investigations of synthetically produced Al sludge served as a comparison for the dissolution behavior of P and Al without the influence of other contaminants (metals, biomass). In addition, the acid consumption was analyzed as a function of the target pH during the dissolution. The dissolution efficiency of ortho-phosphate in tertiary and anaerobically digested sludge after acid treatment at pH 2 was ∼90%. The dissolution efficiency of Al and Ca in tertiary sludge was also ∼90% at pH 2, while the release efficiency of Al and Ca in anaerobically digested sludge was lower, ∼70% at pH 2. In tertiary sludge, about 75% of Fe was found dissolved at pH 2, whereas in anaerobically digested sludge this value was higher, ∼90%. Based on the experimental data, it can be concluded that significant dissolution of phosphorus from Al-containing tertiary sludge can take place at pH < 3. The highest sulfuric acid consumption for P dissolution was observed in the case of tertiary sludge at pH 2.
ISSN:0273-1223
1996-9732
DOI:10.2166/wst.2020.414