Simultaneous amorphous silica and phosphorus recovery from rice husk poultry litter ash. Issue 15 (26th February 2021)

• Record Type: Journal Article
• Authors: Fiameni, Laura; Assi, Ahmad; Fahimi, Ario; Valentim, Bruno; Moreira, Karen; Predeanu, Georgeta; Slăvescu, Valerica; Vasile, Bogdan Ş.; Nicoară, Adrian I.; Borgese, Laura; Boniardi, Gaia; Turolla, Andrea; Canziani, Roberto; Bontempi, Elza
• Is Part Of: RSC advances. Volume 11:Issue 15(2021)
• Page Start: 8927
• Page End: 8939
• Publication Date: 2021-02-26
• Subjects: Chemistry -- Periodicals; 540.5
• DOI: 10.1039/d0ra10120f
• Languages: English
• ISSNs: 2046-2069

Abstract

Abstract : Rice husk poultry litter ash (RHPLA) is proposed as a valuable secondary source to recover phopshorus and amorphous silica in three steps. Abstract : The livestock sector is one of the most important sectors of the agricultural economy due to an increase in the demand for animal protein. This increase generates serious waste disposal concerns and has negative environmental consequences. Furthermore, the food production chain needs phosphorus (P), which is listed as a critical raw material due to its high demand and limited availability in Europe. Manure contains large amounts of P and other elements that may be recycled, in the frame of circular economy and "zero waste" principles, and reused as a by-product for fertilizer production and other applications. This paper focuses on the extraction and recovery of amorphous silica from rice husk poultry litter ash. Two different extraction procedures are proposed and compared, and the obtained silica is characterized. This work shows that amorphous silica can be recovered as an almost pure material rendering the residual ash free of P. It also addresses the possibility of more specific phosphorous extraction procedures via acid leaching.