dc.contributor |
Universitat de Barcelona |
dc.contributor.author |
Querol Carceller, Xavier |
dc.contributor.author |
Dosta Parras, Joan |
dc.contributor.author |
Valderrama, César |
dc.contributor.author |
Licon Bernal, Edxon Eduardo |
dc.contributor.author |
Moreno, Natalia |
dc.contributor.author |
Hermassi, Mehrez |
dc.contributor.author |
Batis, Narjes H. |
dc.contributor.author |
Cortina, Jose Luis |
dc.date |
2019-06-18T12:26:23Z |
dc.date |
2018-07-15 |
dc.date |
2019-06-18T12:26:23Z |
dc.date |
info:eu-repo/date/embargoEnd/2020-07-15 |
dc.identifier.citation |
0048-9697 |
dc.identifier.citation |
687303 |
dc.identifier.uri |
http://hdl.handle.net/2445/135317 |
dc.format |
9 p. |
dc.format |
application/pdf |
dc.language.iso |
eng |
dc.publisher |
Elsevier B.V. |
dc.relation |
Versió postprint del document publicat a: https://doi.org/10.1016/j.scitotenv.2018.02.243 |
dc.relation |
Science of the Total Environment, 2018, vol. 630, p. 781-789 |
dc.relation |
https://doi.org/10.1016/j.scitotenv.2018.02.243 |
dc.rights |
cc-by-nc-nd (c) Elsevier B.V., 2018 |
dc.rights |
info:eu-repo/semantics/embargoedAccess |
dc.rights |
http://creativecommons.org/licenses/by-nc-nd/3.0/es |
dc.subject |
Zeolites |
dc.subject |
Nutrients (Medi ambient) |
dc.subject |
Digestió anaeròbia |
dc.subject |
Llots de depuradora |
dc.subject |
Zeolites |
dc.subject |
Nutrients (Ecology) |
dc.subject |
Anaerobic digestion |
dc.subject |
Sewage sludge |
dc.title |
Simultaneous ammonium and phosphate recovery and stabilization from urban sewage sludge anaerobic digestates using reactive sorbents |
dc.type |
info:eu-repo/semantics/article |
dc.type |
info:eu-repo/semantics/acceptedVersion |
dc.description.abstract |
The use of low-cost inorganic sorbents as a new sustainable strategy to enhance the valorization of nutrients (N-P-K), from the urban water cycle (e.g., side streams from sewage sludge anaerobic digestion), in agriculture applications is presented. The simultaneous recovery and stabilization of ammonium and phosphate by using a mixture of two reactive sorbents (Na and K zeolites and magnesium oxide) was evaluated. The nutrients stabilization process, favoured at alkaline pH values, is carried out by a) the precipitation of phosphate ions with magnesium and/or ammonium ions and b) the sorption of ammonium by Na- and K-zeolites. MgO(s) promoted the stabilization of phosphate as bobierrite (Mg3(PO4)2(s)) or struvite (MgNH4PO4(s)) depending on the applied dose. Doses with the stoichiometric molar ratio of Mg/P promote the formation of bobierrite, while molar ratios higher than 3 favour the formation of struvite. Na zeolites (NaP1-NA, NaP1-IQE) demonstrated efficiency on ammonium stabilization between 60±2 (for 15gZ/L) to 90±3% (for 50gZ/L). The ammonium recovery efficiency is limited by the zeolite sorption capacity. If the target of the fertilizing criteria should include K, then the use of a K-zeolite (e.g., 5AH-IQE) provides a good solution. The optimum pH for the precipitation of struvite and bobierrite is 9.5 and the optimum pH for ammonium removal is between 4 and 8.5. N is present in higher concentrations (up 0.7-1gNH4+/L) when pH is ranged between 8.2 and 8.6. The ammonium recovery ratios were better than those previously reported using only magnesium oxide or even a more expensive reagent as newberrite (MgHPO4(s)). The recovery mechanisms described generate low-solubility stabilized nutrients forms that potentially can be applied as slow-release fertilizers in agriculture. Thus, the use in agriculture of blends of digested sludge with low-solubility stabilized nutrients forms will improve soils quality properties in terms of organic matter and nutrients availability. |