Additive Manufacturing of Geopolymers Modified with Microalgal Biomass Biofiller from Wastewater Treatment Plants
This paper deals with the additive manufacturing of metakaolin-based geopolymers and with the use of microalgal biomass from wastewater treatment plants as biofiller in this kind of cementitious material. The study was developed following the evolution stages of the material, which was prepared and printed as a soft paste and then hardened thanks to an inorganic polymerization reaction (geopolymerization). Thus, the characterization techniques adopted encompassed rheometry, mechanical tests performed on the hardened material, scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy (EDS) and mercury intrusion porosimetry (MIP). Microalgal biomass addition, evaluated in this study at 1, 3 and 5 php with respect to the powder weight, affected both the properties of the fresh and of the hardened material. Regarding the former aspect, biomass reduced the yield stress of the pastes, improving the ease of the extrusion process, but potentially worsening the ability to build structures in height. When hardened, geopolymers containing microalgae showed mechanical properties comparable to the unfilled material and a microstructure characterized by smaller pores. Finally, a printing test was successfully performed with a larger printer to assess the feasibility of producing large-scale structures. Taking into account these results, this study demonstrates the possibility of using microalgal biomass as biofiller in geopolymers for additive manufacturing.
Comparison of extraction and derivatization methods for sample preparation
of algal oils prior to FAME determination
This investigation focuses on the
most optimum method to carry out sample preparation on the algae sample
to investigate the composition of the sample.Fiona Comparison of sample prep methods Poster
Algae provide an effective, sustainable, unlimited and almost entirely untapped resource for bio-based processes and products. Dense with energy and rich in nutrients, this natural product is ripe for exploitation by forward-thinking research organisations and commercial companies.
A novel energy recovery device/RO test rig targeted to treat & recoup low industrial wastewater flows
Cairns, Mícheál and Fitzsimons, Lorna and Delauré, Yan (2017)
In: 11th Membranes in Drinking and Industrial Water Production (MDIW) conference, 5- 8 Feb 2017, Leeuwarden, The Netherlands.
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