Biochar production from sewage sludge and microalgae mixtures: properties, sustainability and possible role in circular economy

In addition to the various options available for sewage sludge disposal, a possible process for sustainable resource recovery from this residue is its transformation into biochar, achieved by post-processing through pyrolysis. Biochar obtained from sewage sludge is considered one of the most interesting final products in a wastewater-based circular economy, as proven by the multitude of its possible uses tested so far in various applications. Recently, combined activated sludge (AS)-microalgae systems have been proposed to simultaneously remove both carbon and nutrients from wastewaters, as alternative to conventional technologies such as those based on denitrification and chemical phosphorus precipitation. Although this combined process could be efficient from the point of view of component removal from effluents, it generates potential issues to solid residue disposal practices, as algae normally respond poorly to traditional, mechanical drying processes. In this study, a disposal solution was investigated, consisting of pyrolysation of a mixed sludge/bioalgae matrix under different conditions: in such way, not only landfilled residuals are practically eliminated, but a material with multiple potential end uses is recovered. Process feedstock (algae, sludge and combinations thereof) and end-products (biochar and bio-oil) were characterised after pyrolysis under different conditions. Algae alone were also subject to preliminary solvent oil extraction to assess whether increased biochar production would result from such process variation (which it did, increasing biochar production by 25–33%). A comprehensive discussion on properties of end products as function of process design, possible applications in a circular economy cycle and advantages of co-pyrolysis follows.

Additional Info

  • Year: 2021
  • Authors: Bolognesi S., Bernardi G., Callegari A., Dondi D., Capodaglio A.G.
  • Reference: Biomass Conversion and Biorefinery, Open Access, Volume 11, Issue 2, Pages 289 - 299, April 2021

Search articles

Title

Year

Authors

Laboratory of Chemical and Enviromental Engineering

Institut de Medi Ambient
Universitat de Girona
Campus Montilivi
17003 Girona

Parc Científic i Tecnològic de la UdG
Edifici Jaume Casademont, Porta B
Pic de Peguera, 15
17003 Girona
Tel. +34 972 41 98 59
info@lequia.udg.cat

 

Search

Keyword

Social Media

Follow us on ...

Facebook Twitter Youtube Linkedin

NOTE! This site uses cookies and similar technologies. If you not change browser settings, you agree to it. Cookie Policy