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Characterization of the Omni-Processor Sewage Sludge Ash for Reuse as Construction Material

Prince Momar Gueye1,2,*, Siham Kamali-Bernard2, Dame Keinde1, Fabrice Bernard2, Vincent Sambou1

1 LE3PI of E S P-UCAD, Dakar, Senegal
2 LGCGM of INSA of Rennes, Rennes, France

* Corresponding Author: Prince Momar Gueye. Email: email

(This article belongs to this Special Issue: Materials and Energy an Updated Image for 2021)

Fluid Dynamics & Materials Processing 2022, 18(6), 1581-1593.


Omni Processors (OP) are machines which use sludge as a fuel to generate electricity and clean water, but create ash at the same time. In the present study, fly ash and bottom ash are investigated as materials for potential reuse in the construction field. First, the granular size, density and Blaine finesse are determined. Then, the chemical composition and microstructure are obtained by means of X-ray fluorescence and Scanning Electron Microscopy-Energy Dispersive Spectroscopy (SEM-EDS), respectively. Finally, ashes reactivity is determined by two chemical methods (modified Chapelle test, bound water content R3) and a mechanical method (pozzolanic activity index). The characterization results indicate two material types: fly ash similar to cement and bottom ash similar to fine sand. That’s why the mortars mechanical strength with fly ash 0%-30% is better than that with bottom ash at the same rate. Fly ash slightly decreases the mechanical strength of mortars while bottom ash induces a much more significant decrease.


Cite This Article

Gueye, P. M., Kamali-Bernard, S., Keinde, D., Bernard, F., Sambou, V. (2022). Characterization of the Omni-Processor Sewage Sludge Ash for Reuse as Construction Material. FDMP-Fluid Dynamics & Materials Processing, 18(6), 1581–1593.

cc This work is licensed under a Creative Commons Attribution 4.0 International License , which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
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