Reducing Environment Pollution by Reusing of Alum Sludge Waste in Stone Mastic Asphalt Mixtures

                                Figure 1: Sludge and cement stone mixture


Around the world, alum sludge waste is being created by the material that is from drinking water from water treatment plants, which is being treated by aluminum salts that is an necessary coagulant that creates a large percentage of water treatment sludge (Mahmood et al., 2021). This can cause major problems in the environment, thus leading scientists to investigate the probability of reusing the alum sludge as a partial replacement of cement filler.

 To conduct this experiment, the researchers used two types of mixed sludge, dried sludge that was 110°C and burned sludge that was 700°C. To verify the best amount of sludge that could be potentially used for permanent use, the researchers used different percentages of the alum sludge, from 0% to100% (Mahmood et al.,2021).

Can the alum sludge make a good replacement for a full cement  asphalt mixture? The results showed that the burned alum sludge was a better fit for the goal that was necessary for the future compared to the dried sludge (Mahmood et al., 2021).


Mahmood, Omar T. “Reducing Environment Pollution by Reusing of Alum Sludge Waste in Stone Mastic Asphalt Mixtures.” ARO-THE SCIENTIFIC JOURNAL OF KOYA UNIVERSITY, vol. 9, no. 2, 2021, pp. 76–82., https://doi.org/10.14500/aro.10871.







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