Title:
Phosphorus Recovery and Solid Adsorbents Obtaining from Sewage Sludge after a Combined Process of Acid Extraction and Pyrolysis
Author(s):
Ruiz-Gómez, N., Martínez, M., Atienza-Martínez, M., Gea, G., Ábrego, J.
Document(s):
Paper
Abstract:
Phosphorus (P) is an essential element in organic life, and it is obtained from phosphate rock, a non-renewable source. Most of the P used in agriculture ends up in the urban waste water and it is concentrated in sewage sludge (SS) after waste water treatment. P extraction from SS with a chemical treatment using acids could provide a renewable source of P. However, SS is a waste, which needs to be correctly managed. Pyrolysis could be an interesting management route since three valuable products could be obtained (liquid, gas and char). The adsorbent properties of the char could be improved with an acid treatment stage before pyrolysis. In this way, the main objective of this work was to evaluate a process to recover P from SS and obtain adsorbent solids by combining the acid treatment of SS and the subsequent pyrolysis of the impregnated solid. The pre-treatment of SS has been carried out using sulphuric acid with different solid to liquid ratios (1:2.5 – 1:10) and extraction times (4 - 24 h). Acid treated solids were subsequently pyrolysed at 550 ºC.
Keywords:
pyrolysis, sewage sludge, phosphorus recovery, adsorbent solid
Topic:
Biomass Conversion Technologies for Liquid and Gaseous Fuels, Chemicals and Materials
Subtopic:
Pyrolysis and other biomass liquefaction technologies
Event:
24th European Biomass Conference and Exhibition
Session:
3CO.7.6
Pages:
1085 - 1089
ISBN:
978-88-89407-165
Paper DOI:
10.5071/24thEUBCE2016-3CO.7.6
Price:
FREE
