Room: Callelongue Parterre
Date: Tuesday, 25 June 2024
Time: 15:00 - 16:00 CEST
Session code 6BO.8
Biochar and soil conditioners
Production of Artificial Fertilizer (struvite) from Hydrothermal Liquified Char
Short Introductive summary
Phosphorus (P) recovery as struvite (NH4MgPO4.6H2O) from sewage sludge has attracted considerable attention due to its potential to be re-used as fertilizer through P recovery. This study investigated an effective P recovery from hydrothermally liquified sewage sludge char (HTL char) via struvite precipitation after extraction using inorganic and organic acids. The optimum operating conditions for maximum P extraction (94 %) were suggested as 0.7 M of acid strength (H2SO4) and 6.5 h of extraction time. Addition of citric acid (CA) during the struvite precipitation from acid-leached P solution was found beneficial as it improved the struvite purity from 36.6% to 54%. Furthermore, Fourier-transform infrared spectroscopy (FTIR) analysis validated the formation of struvite with the availability of functional groups similar to that of commercial struvite. Upon comparison with the EU fertilizer’s regulations, HTL char struvite was found beneficial as it showed low heavy metal content. Thus, instead of direct land application of sewage sludge, harvested struvite from HTL char could be directly used as a fertilizer with negligible environmental risk.
Presenter
Neha SHUKLA
Aarhus University, Chemical Engineering Dpt., DENMARK
Presenter's biography
Specializing in biochar production and its applications, Dr Neha works in hydrothermal liquefaction and pyrolysis of municipal and agricultural waste.
Biographies and Short introductive summaries are supplied directly by presenters and are published here unedited
Co-authors:
P. Biller, Aarhus University, DENMARK
Session reference: 6BO.8.4