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On wet chemical phosphorus recovery from sewage sludge ash by acidic or alkaline leaching and an optimized combination of both

  • The advantages and drawbacks of existing wet chemical phosphorus (P) recovery technologies, their applicability to different types of sewage sludge ash (SSA) and the role of the decay products of detergent zeolites as a source of reactive Al in SSA are analyzed. Since neither a purely acidic nor a purely alkaline treatment are able to provide satisfactory technical solutions a wet chemical phosphorus (P) recovery process for sewage sludge ashes (SSAs) is investigated in detail that is based on a sequential treatment of SSA with an acid and a base. As a result of an acidic pre-treatment, the P fraction of the raw SSA that was bound as – alkaline-insoluble – calcium phosphate (Ca–P) is converted into aluminum phosphate (Al–P). This newly formed Al–P can be easily dissolved via alkaline treatment and then easily separated from the alkaline leachate via precipitation of Ca–P. The Al-component can be reused as precipitant for P-removal in waste water treatment plants (WWTPs). TheThe advantages and drawbacks of existing wet chemical phosphorus (P) recovery technologies, their applicability to different types of sewage sludge ash (SSA) and the role of the decay products of detergent zeolites as a source of reactive Al in SSA are analyzed. Since neither a purely acidic nor a purely alkaline treatment are able to provide satisfactory technical solutions a wet chemical phosphorus (P) recovery process for sewage sludge ashes (SSAs) is investigated in detail that is based on a sequential treatment of SSA with an acid and a base. As a result of an acidic pre-treatment, the P fraction of the raw SSA that was bound as – alkaline-insoluble – calcium phosphate (Ca–P) is converted into aluminum phosphate (Al–P). This newly formed Al–P can be easily dissolved via alkaline treatment and then easily separated from the alkaline leachate via precipitation of Ca–P. The Al-component can be reused as precipitant for P-removal in waste water treatment plants (WWTPs). The investigated process requires fewer chemicals than the direct acidic dissolution of all P-compounds contained in the SSA. This is due to the described rearrangement of the P component from Ca–P to Al–P. That such a rearrangement of P occurs indeed was confirmed through a combination of XRD, ICP and XRF analyses together with mass balance calculations. The present investigation proves that the process works for very different types of SSAs: For Al-rich SSAs that come from WWTPs where Al-salt is used for chemical P-removal the described sequential treatment process works best and yields P-recovery rates as high as 70–77%. But even for SSAs from WWTPs where only iron salt is used for chemical P-removal, a considerable amount of the reactive Al necessary for the described P-rearrangement is supplied by decay products of detergent zeolites, a hidden Al-source present in most SSAs produced in Europe.zeige mehrzeige weniger

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Metadaten
Autor*innen:S. Petzet, Burkhard Peplinski, P. Cornel
Dokumenttyp:Zeitschriftenartikel
Veröffentlichungsform:Verlagsliteratur
Sprache:Englisch
Titel des übergeordneten Werkes (Englisch):Water research
Jahr der Erstveröffentlichung:2012
Herausgeber (Institution):International Association on Water Pollution Research
Verlag:Elsevier
Verlagsort:Amsterdam
Jahrgang/Band:46
Ausgabe/Heft:12
Erste Seite:3769
Letzte Seite:3780
Freie Schlagwörter:Alkaline and acidic leaching; Aluminum phosphate; Calcium phosphate; Detergent zeolites; Phosphorus recovery; Sewage sludge ash; XRD analysis
DOI:10.1016/j.watres.2012.03.068
ISSN:0043-1354
Verfügbarkeit des Dokuments:Physisches Exemplar in der Bibliothek der BAM vorhanden ("Hardcopy Access")
Bibliotheksstandort:Sonderstandort: Publica-Schrank
Datum der Freischaltung:19.02.2016
Referierte Publikation:Ja
Datum der Eintragung als referierte Publikation:11.06.2012
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